2763 lines
75 KiB
C
2763 lines
75 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) Microsoft Corporation.
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*
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* Author:
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* Jake Oshins <jakeo@microsoft.com>
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*
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* This driver acts as a paravirtual front-end for PCI Express root buses.
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* When a PCI Express function (either an entire device or an SR-IOV
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* Virtual Function) is being passed through to the VM, this driver exposes
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* a new bus to the guest VM. This is modeled as a root PCI bus because
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* no bridges are being exposed to the VM. In fact, with a "Generation 2"
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* VM within Hyper-V, there may seem to be no PCI bus at all in the VM
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* until a device as been exposed using this driver.
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*
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* Each root PCI bus has its own PCI domain, which is called "Segment" in
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* the PCI Firmware Specifications. Thus while each device passed through
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* to the VM using this front-end will appear at "device 0", the domain will
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* be unique. Typically, each bus will have one PCI function on it, though
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* this driver does support more than one.
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*
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* In order to map the interrupts from the device through to the guest VM,
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* this driver also implements an IRQ Domain, which handles interrupts (either
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* MSI or MSI-X) associated with the functions on the bus. As interrupts are
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* set up, torn down, or reaffined, this driver communicates with the
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* underlying hypervisor to adjust the mappings in the I/O MMU so that each
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* interrupt will be delivered to the correct virtual processor at the right
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* vector. This driver does not support level-triggered (line-based)
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* interrupts, and will report that the Interrupt Line register in the
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* function's configuration space is zero.
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*
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* The rest of this driver mostly maps PCI concepts onto underlying Hyper-V
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* facilities. For instance, the configuration space of a function exposed
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* by Hyper-V is mapped into a single page of memory space, and the
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* read and write handlers for config space must be aware of this mechanism.
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* Similarly, device setup and teardown involves messages sent to and from
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* the PCI back-end driver in Hyper-V.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/semaphore.h>
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#include <linux/irqdomain.h>
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#include <asm/irqdomain.h>
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#include <asm/apic.h>
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#include <linux/irq.h>
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#include <linux/msi.h>
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#include <linux/hyperv.h>
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#include <linux/refcount.h>
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#include <asm/mshyperv.h>
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/*
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* Protocol versions. The low word is the minor version, the high word the
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* major version.
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*/
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#define PCI_MAKE_VERSION(major, minor) ((u32)(((major) << 16) | (minor)))
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#define PCI_MAJOR_VERSION(version) ((u32)(version) >> 16)
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#define PCI_MINOR_VERSION(version) ((u32)(version) & 0xff)
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enum pci_protocol_version_t {
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PCI_PROTOCOL_VERSION_1_1 = PCI_MAKE_VERSION(1, 1), /* Win10 */
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PCI_PROTOCOL_VERSION_1_2 = PCI_MAKE_VERSION(1, 2), /* RS1 */
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};
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#define CPU_AFFINITY_ALL -1ULL
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/*
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* Supported protocol versions in the order of probing - highest go
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* first.
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*/
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static enum pci_protocol_version_t pci_protocol_versions[] = {
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PCI_PROTOCOL_VERSION_1_2,
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PCI_PROTOCOL_VERSION_1_1,
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};
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/*
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* Protocol version negotiated by hv_pci_protocol_negotiation().
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*/
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static enum pci_protocol_version_t pci_protocol_version;
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#define PCI_CONFIG_MMIO_LENGTH 0x2000
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#define CFG_PAGE_OFFSET 0x1000
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#define CFG_PAGE_SIZE (PCI_CONFIG_MMIO_LENGTH - CFG_PAGE_OFFSET)
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#define MAX_SUPPORTED_MSI_MESSAGES 0x400
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#define STATUS_REVISION_MISMATCH 0xC0000059
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/* space for 32bit serial number as string */
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#define SLOT_NAME_SIZE 11
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/*
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* Message Types
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*/
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enum pci_message_type {
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/*
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* Version 1.1
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*/
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PCI_MESSAGE_BASE = 0x42490000,
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PCI_BUS_RELATIONS = PCI_MESSAGE_BASE + 0,
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PCI_QUERY_BUS_RELATIONS = PCI_MESSAGE_BASE + 1,
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PCI_POWER_STATE_CHANGE = PCI_MESSAGE_BASE + 4,
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PCI_QUERY_RESOURCE_REQUIREMENTS = PCI_MESSAGE_BASE + 5,
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PCI_QUERY_RESOURCE_RESOURCES = PCI_MESSAGE_BASE + 6,
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PCI_BUS_D0ENTRY = PCI_MESSAGE_BASE + 7,
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PCI_BUS_D0EXIT = PCI_MESSAGE_BASE + 8,
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PCI_READ_BLOCK = PCI_MESSAGE_BASE + 9,
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PCI_WRITE_BLOCK = PCI_MESSAGE_BASE + 0xA,
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PCI_EJECT = PCI_MESSAGE_BASE + 0xB,
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PCI_QUERY_STOP = PCI_MESSAGE_BASE + 0xC,
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PCI_REENABLE = PCI_MESSAGE_BASE + 0xD,
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PCI_QUERY_STOP_FAILED = PCI_MESSAGE_BASE + 0xE,
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PCI_EJECTION_COMPLETE = PCI_MESSAGE_BASE + 0xF,
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PCI_RESOURCES_ASSIGNED = PCI_MESSAGE_BASE + 0x10,
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PCI_RESOURCES_RELEASED = PCI_MESSAGE_BASE + 0x11,
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PCI_INVALIDATE_BLOCK = PCI_MESSAGE_BASE + 0x12,
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PCI_QUERY_PROTOCOL_VERSION = PCI_MESSAGE_BASE + 0x13,
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PCI_CREATE_INTERRUPT_MESSAGE = PCI_MESSAGE_BASE + 0x14,
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PCI_DELETE_INTERRUPT_MESSAGE = PCI_MESSAGE_BASE + 0x15,
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PCI_RESOURCES_ASSIGNED2 = PCI_MESSAGE_BASE + 0x16,
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PCI_CREATE_INTERRUPT_MESSAGE2 = PCI_MESSAGE_BASE + 0x17,
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PCI_DELETE_INTERRUPT_MESSAGE2 = PCI_MESSAGE_BASE + 0x18, /* unused */
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PCI_MESSAGE_MAXIMUM
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};
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/*
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* Structures defining the virtual PCI Express protocol.
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*/
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union pci_version {
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struct {
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u16 minor_version;
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u16 major_version;
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} parts;
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u32 version;
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} __packed;
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/*
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* Function numbers are 8-bits wide on Express, as interpreted through ARI,
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* which is all this driver does. This representation is the one used in
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* Windows, which is what is expected when sending this back and forth with
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* the Hyper-V parent partition.
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*/
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union win_slot_encoding {
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struct {
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u32 dev:5;
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u32 func:3;
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u32 reserved:24;
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} bits;
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u32 slot;
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} __packed;
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/*
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* Pretty much as defined in the PCI Specifications.
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*/
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struct pci_function_description {
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u16 v_id; /* vendor ID */
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u16 d_id; /* device ID */
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u8 rev;
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u8 prog_intf;
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u8 subclass;
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u8 base_class;
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u32 subsystem_id;
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union win_slot_encoding win_slot;
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u32 ser; /* serial number */
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} __packed;
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/**
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* struct hv_msi_desc
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* @vector: IDT entry
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* @delivery_mode: As defined in Intel's Programmer's
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* Reference Manual, Volume 3, Chapter 8.
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* @vector_count: Number of contiguous entries in the
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* Interrupt Descriptor Table that are
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* occupied by this Message-Signaled
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* Interrupt. For "MSI", as first defined
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* in PCI 2.2, this can be between 1 and
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* 32. For "MSI-X," as first defined in PCI
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* 3.0, this must be 1, as each MSI-X table
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* entry would have its own descriptor.
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* @reserved: Empty space
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* @cpu_mask: All the target virtual processors.
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*/
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struct hv_msi_desc {
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u8 vector;
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u8 delivery_mode;
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u16 vector_count;
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u32 reserved;
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u64 cpu_mask;
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} __packed;
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/**
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* struct hv_msi_desc2 - 1.2 version of hv_msi_desc
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* @vector: IDT entry
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* @delivery_mode: As defined in Intel's Programmer's
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* Reference Manual, Volume 3, Chapter 8.
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* @vector_count: Number of contiguous entries in the
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* Interrupt Descriptor Table that are
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* occupied by this Message-Signaled
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* Interrupt. For "MSI", as first defined
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* in PCI 2.2, this can be between 1 and
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* 32. For "MSI-X," as first defined in PCI
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* 3.0, this must be 1, as each MSI-X table
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* entry would have its own descriptor.
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* @processor_count: number of bits enabled in array.
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* @processor_array: All the target virtual processors.
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*/
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struct hv_msi_desc2 {
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u8 vector;
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u8 delivery_mode;
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u16 vector_count;
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u16 processor_count;
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u16 processor_array[32];
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} __packed;
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/**
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* struct tran_int_desc
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* @reserved: unused, padding
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* @vector_count: same as in hv_msi_desc
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* @data: This is the "data payload" value that is
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* written by the device when it generates
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* a message-signaled interrupt, either MSI
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* or MSI-X.
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* @address: This is the address to which the data
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* payload is written on interrupt
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* generation.
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*/
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struct tran_int_desc {
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u16 reserved;
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u16 vector_count;
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u32 data;
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u64 address;
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} __packed;
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/*
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* A generic message format for virtual PCI.
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* Specific message formats are defined later in the file.
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*/
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struct pci_message {
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u32 type;
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} __packed;
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struct pci_child_message {
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struct pci_message message_type;
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union win_slot_encoding wslot;
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} __packed;
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struct pci_incoming_message {
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struct vmpacket_descriptor hdr;
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struct pci_message message_type;
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} __packed;
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struct pci_response {
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struct vmpacket_descriptor hdr;
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s32 status; /* negative values are failures */
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} __packed;
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struct pci_packet {
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void (*completion_func)(void *context, struct pci_response *resp,
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int resp_packet_size);
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void *compl_ctxt;
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struct pci_message message[0];
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};
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/*
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* Specific message types supporting the PCI protocol.
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*/
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/*
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* Version negotiation message. Sent from the guest to the host.
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* The guest is free to try different versions until the host
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* accepts the version.
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*
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* pci_version: The protocol version requested.
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* is_last_attempt: If TRUE, this is the last version guest will request.
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* reservedz: Reserved field, set to zero.
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*/
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struct pci_version_request {
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struct pci_message message_type;
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u32 protocol_version;
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} __packed;
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/*
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* Bus D0 Entry. This is sent from the guest to the host when the virtual
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* bus (PCI Express port) is ready for action.
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*/
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struct pci_bus_d0_entry {
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struct pci_message message_type;
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u32 reserved;
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u64 mmio_base;
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} __packed;
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struct pci_bus_relations {
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struct pci_incoming_message incoming;
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u32 device_count;
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struct pci_function_description func[0];
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} __packed;
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struct pci_q_res_req_response {
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struct vmpacket_descriptor hdr;
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s32 status; /* negative values are failures */
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u32 probed_bar[6];
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} __packed;
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struct pci_set_power {
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struct pci_message message_type;
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union win_slot_encoding wslot;
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u32 power_state; /* In Windows terms */
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u32 reserved;
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} __packed;
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struct pci_set_power_response {
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struct vmpacket_descriptor hdr;
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s32 status; /* negative values are failures */
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union win_slot_encoding wslot;
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u32 resultant_state; /* In Windows terms */
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u32 reserved;
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} __packed;
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struct pci_resources_assigned {
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struct pci_message message_type;
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union win_slot_encoding wslot;
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u8 memory_range[0x14][6]; /* not used here */
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u32 msi_descriptors;
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u32 reserved[4];
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} __packed;
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struct pci_resources_assigned2 {
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struct pci_message message_type;
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union win_slot_encoding wslot;
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u8 memory_range[0x14][6]; /* not used here */
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u32 msi_descriptor_count;
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u8 reserved[70];
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} __packed;
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struct pci_create_interrupt {
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struct pci_message message_type;
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union win_slot_encoding wslot;
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struct hv_msi_desc int_desc;
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} __packed;
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struct pci_create_int_response {
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struct pci_response response;
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u32 reserved;
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struct tran_int_desc int_desc;
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} __packed;
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struct pci_create_interrupt2 {
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struct pci_message message_type;
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union win_slot_encoding wslot;
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struct hv_msi_desc2 int_desc;
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} __packed;
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struct pci_delete_interrupt {
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struct pci_message message_type;
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union win_slot_encoding wslot;
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struct tran_int_desc int_desc;
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} __packed;
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struct pci_dev_incoming {
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struct pci_incoming_message incoming;
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union win_slot_encoding wslot;
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} __packed;
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struct pci_eject_response {
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struct pci_message message_type;
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union win_slot_encoding wslot;
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u32 status;
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} __packed;
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static int pci_ring_size = (4 * PAGE_SIZE);
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/*
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* Definitions or interrupt steering hypercall.
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*/
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#define HV_PARTITION_ID_SELF ((u64)-1)
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#define HVCALL_RETARGET_INTERRUPT 0x7e
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struct hv_interrupt_entry {
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u32 source; /* 1 for MSI(-X) */
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u32 reserved1;
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u32 address;
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u32 data;
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};
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#define HV_VP_SET_BANK_COUNT_MAX 5 /* current implementation limit */
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struct hv_vp_set {
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u64 format; /* 0 (HvGenericSetSparse4k) */
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u64 valid_banks;
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u64 masks[HV_VP_SET_BANK_COUNT_MAX];
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};
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/*
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* flags for hv_device_interrupt_target.flags
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*/
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#define HV_DEVICE_INTERRUPT_TARGET_MULTICAST 1
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#define HV_DEVICE_INTERRUPT_TARGET_PROCESSOR_SET 2
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struct hv_device_interrupt_target {
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u32 vector;
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u32 flags;
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union {
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u64 vp_mask;
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struct hv_vp_set vp_set;
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};
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};
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struct retarget_msi_interrupt {
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u64 partition_id; /* use "self" */
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u64 device_id;
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struct hv_interrupt_entry int_entry;
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u64 reserved2;
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struct hv_device_interrupt_target int_target;
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} __packed;
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/*
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* Driver specific state.
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*/
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enum hv_pcibus_state {
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hv_pcibus_init = 0,
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hv_pcibus_probed,
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hv_pcibus_installed,
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hv_pcibus_removed,
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hv_pcibus_maximum
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};
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struct hv_pcibus_device {
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struct pci_sysdata sysdata;
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enum hv_pcibus_state state;
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refcount_t remove_lock;
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struct hv_device *hdev;
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resource_size_t low_mmio_space;
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resource_size_t high_mmio_space;
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struct resource *mem_config;
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struct resource *low_mmio_res;
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struct resource *high_mmio_res;
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struct completion *survey_event;
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struct completion remove_event;
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struct pci_bus *pci_bus;
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spinlock_t config_lock; /* Avoid two threads writing index page */
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spinlock_t device_list_lock; /* Protect lists below */
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void __iomem *cfg_addr;
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struct list_head resources_for_children;
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struct list_head children;
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struct list_head dr_list;
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struct msi_domain_info msi_info;
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struct msi_controller msi_chip;
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struct irq_domain *irq_domain;
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/* hypercall arg, must not cross page boundary */
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struct retarget_msi_interrupt retarget_msi_interrupt_params;
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spinlock_t retarget_msi_interrupt_lock;
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struct workqueue_struct *wq;
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};
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/*
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* Tracks "Device Relations" messages from the host, which must be both
|
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* processed in order and deferred so that they don't run in the context
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* of the incoming packet callback.
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*/
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struct hv_dr_work {
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struct work_struct wrk;
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struct hv_pcibus_device *bus;
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};
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struct hv_dr_state {
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struct list_head list_entry;
|
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u32 device_count;
|
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struct pci_function_description func[0];
|
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};
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enum hv_pcichild_state {
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hv_pcichild_init = 0,
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hv_pcichild_requirements,
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hv_pcichild_resourced,
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hv_pcichild_ejecting,
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hv_pcichild_maximum
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};
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struct hv_pci_dev {
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/* List protected by pci_rescan_remove_lock */
|
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struct list_head list_entry;
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refcount_t refs;
|
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enum hv_pcichild_state state;
|
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struct pci_slot *pci_slot;
|
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struct pci_function_description desc;
|
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bool reported_missing;
|
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struct hv_pcibus_device *hbus;
|
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struct work_struct wrk;
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|
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/*
|
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* What would be observed if one wrote 0xFFFFFFFF to a BAR and then
|
|
* read it back, for each of the BAR offsets within config space.
|
|
*/
|
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u32 probed_bar[6];
|
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};
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|
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struct hv_pci_compl {
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struct completion host_event;
|
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s32 completion_status;
|
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};
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|
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static void hv_pci_onchannelcallback(void *context);
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/**
|
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* hv_pci_generic_compl() - Invoked for a completion packet
|
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* @context: Set up by the sender of the packet.
|
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* @resp: The response packet
|
|
* @resp_packet_size: Size in bytes of the packet
|
|
*
|
|
* This function is used to trigger an event and report status
|
|
* for any message for which the completion packet contains a
|
|
* status and nothing else.
|
|
*/
|
|
static void hv_pci_generic_compl(void *context, struct pci_response *resp,
|
|
int resp_packet_size)
|
|
{
|
|
struct hv_pci_compl *comp_pkt = context;
|
|
|
|
if (resp_packet_size >= offsetofend(struct pci_response, status))
|
|
comp_pkt->completion_status = resp->status;
|
|
else
|
|
comp_pkt->completion_status = -1;
|
|
|
|
complete(&comp_pkt->host_event);
|
|
}
|
|
|
|
static struct hv_pci_dev *get_pcichild_wslot(struct hv_pcibus_device *hbus,
|
|
u32 wslot);
|
|
|
|
static void get_pcichild(struct hv_pci_dev *hpdev)
|
|
{
|
|
refcount_inc(&hpdev->refs);
|
|
}
|
|
|
|
static void put_pcichild(struct hv_pci_dev *hpdev)
|
|
{
|
|
if (refcount_dec_and_test(&hpdev->refs))
|
|
kfree(hpdev);
|
|
}
|
|
|
|
static void get_hvpcibus(struct hv_pcibus_device *hv_pcibus);
|
|
static void put_hvpcibus(struct hv_pcibus_device *hv_pcibus);
|
|
|
|
/*
|
|
* There is no good way to get notified from vmbus_onoffer_rescind(),
|
|
* so let's use polling here, since this is not a hot path.
|
|
*/
|
|
static int wait_for_response(struct hv_device *hdev,
|
|
struct completion *comp)
|
|
{
|
|
while (true) {
|
|
if (hdev->channel->rescind) {
|
|
dev_warn_once(&hdev->device, "The device is gone.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (wait_for_completion_timeout(comp, HZ / 10))
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* devfn_to_wslot() - Convert from Linux PCI slot to Windows
|
|
* @devfn: The Linux representation of PCI slot
|
|
*
|
|
* Windows uses a slightly different representation of PCI slot.
|
|
*
|
|
* Return: The Windows representation
|
|
*/
|
|
static u32 devfn_to_wslot(int devfn)
|
|
{
|
|
union win_slot_encoding wslot;
|
|
|
|
wslot.slot = 0;
|
|
wslot.bits.dev = PCI_SLOT(devfn);
|
|
wslot.bits.func = PCI_FUNC(devfn);
|
|
|
|
return wslot.slot;
|
|
}
|
|
|
|
/**
|
|
* wslot_to_devfn() - Convert from Windows PCI slot to Linux
|
|
* @wslot: The Windows representation of PCI slot
|
|
*
|
|
* Windows uses a slightly different representation of PCI slot.
|
|
*
|
|
* Return: The Linux representation
|
|
*/
|
|
static int wslot_to_devfn(u32 wslot)
|
|
{
|
|
union win_slot_encoding slot_no;
|
|
|
|
slot_no.slot = wslot;
|
|
return PCI_DEVFN(slot_no.bits.dev, slot_no.bits.func);
|
|
}
|
|
|
|
/*
|
|
* PCI Configuration Space for these root PCI buses is implemented as a pair
|
|
* of pages in memory-mapped I/O space. Writing to the first page chooses
|
|
* the PCI function being written or read. Once the first page has been
|
|
* written to, the following page maps in the entire configuration space of
|
|
* the function.
|
|
*/
|
|
|
|
/**
|
|
* _hv_pcifront_read_config() - Internal PCI config read
|
|
* @hpdev: The PCI driver's representation of the device
|
|
* @where: Offset within config space
|
|
* @size: Size of the transfer
|
|
* @val: Pointer to the buffer receiving the data
|
|
*/
|
|
static void _hv_pcifront_read_config(struct hv_pci_dev *hpdev, int where,
|
|
int size, u32 *val)
|
|
{
|
|
unsigned long flags;
|
|
void __iomem *addr = hpdev->hbus->cfg_addr + CFG_PAGE_OFFSET + where;
|
|
|
|
/*
|
|
* If the attempt is to read the IDs or the ROM BAR, simulate that.
|
|
*/
|
|
if (where + size <= PCI_COMMAND) {
|
|
memcpy(val, ((u8 *)&hpdev->desc.v_id) + where, size);
|
|
} else if (where >= PCI_CLASS_REVISION && where + size <=
|
|
PCI_CACHE_LINE_SIZE) {
|
|
memcpy(val, ((u8 *)&hpdev->desc.rev) + where -
|
|
PCI_CLASS_REVISION, size);
|
|
} else if (where >= PCI_SUBSYSTEM_VENDOR_ID && where + size <=
|
|
PCI_ROM_ADDRESS) {
|
|
memcpy(val, (u8 *)&hpdev->desc.subsystem_id + where -
|
|
PCI_SUBSYSTEM_VENDOR_ID, size);
|
|
} else if (where >= PCI_ROM_ADDRESS && where + size <=
|
|
PCI_CAPABILITY_LIST) {
|
|
/* ROM BARs are unimplemented */
|
|
*val = 0;
|
|
} else if (where >= PCI_INTERRUPT_LINE && where + size <=
|
|
PCI_INTERRUPT_PIN) {
|
|
/*
|
|
* Interrupt Line and Interrupt PIN are hard-wired to zero
|
|
* because this front-end only supports message-signaled
|
|
* interrupts.
|
|
*/
|
|
*val = 0;
|
|
} else if (where + size <= CFG_PAGE_SIZE) {
|
|
spin_lock_irqsave(&hpdev->hbus->config_lock, flags);
|
|
/* Choose the function to be read. (See comment above) */
|
|
writel(hpdev->desc.win_slot.slot, hpdev->hbus->cfg_addr);
|
|
/* Make sure the function was chosen before we start reading. */
|
|
mb();
|
|
/* Read from that function's config space. */
|
|
switch (size) {
|
|
case 1:
|
|
*val = readb(addr);
|
|
break;
|
|
case 2:
|
|
*val = readw(addr);
|
|
break;
|
|
default:
|
|
*val = readl(addr);
|
|
break;
|
|
}
|
|
/*
|
|
* Make sure the read was done before we release the spinlock
|
|
* allowing consecutive reads/writes.
|
|
*/
|
|
mb();
|
|
spin_unlock_irqrestore(&hpdev->hbus->config_lock, flags);
|
|
} else {
|
|
dev_err(&hpdev->hbus->hdev->device,
|
|
"Attempt to read beyond a function's config space.\n");
|
|
}
|
|
}
|
|
|
|
static u16 hv_pcifront_get_vendor_id(struct hv_pci_dev *hpdev)
|
|
{
|
|
u16 ret;
|
|
unsigned long flags;
|
|
void __iomem *addr = hpdev->hbus->cfg_addr + CFG_PAGE_OFFSET +
|
|
PCI_VENDOR_ID;
|
|
|
|
spin_lock_irqsave(&hpdev->hbus->config_lock, flags);
|
|
|
|
/* Choose the function to be read. (See comment above) */
|
|
writel(hpdev->desc.win_slot.slot, hpdev->hbus->cfg_addr);
|
|
/* Make sure the function was chosen before we start reading. */
|
|
mb();
|
|
/* Read from that function's config space. */
|
|
ret = readw(addr);
|
|
/*
|
|
* mb() is not required here, because the spin_unlock_irqrestore()
|
|
* is a barrier.
|
|
*/
|
|
|
|
spin_unlock_irqrestore(&hpdev->hbus->config_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* _hv_pcifront_write_config() - Internal PCI config write
|
|
* @hpdev: The PCI driver's representation of the device
|
|
* @where: Offset within config space
|
|
* @size: Size of the transfer
|
|
* @val: The data being transferred
|
|
*/
|
|
static void _hv_pcifront_write_config(struct hv_pci_dev *hpdev, int where,
|
|
int size, u32 val)
|
|
{
|
|
unsigned long flags;
|
|
void __iomem *addr = hpdev->hbus->cfg_addr + CFG_PAGE_OFFSET + where;
|
|
|
|
if (where >= PCI_SUBSYSTEM_VENDOR_ID &&
|
|
where + size <= PCI_CAPABILITY_LIST) {
|
|
/* SSIDs and ROM BARs are read-only */
|
|
} else if (where >= PCI_COMMAND && where + size <= CFG_PAGE_SIZE) {
|
|
spin_lock_irqsave(&hpdev->hbus->config_lock, flags);
|
|
/* Choose the function to be written. (See comment above) */
|
|
writel(hpdev->desc.win_slot.slot, hpdev->hbus->cfg_addr);
|
|
/* Make sure the function was chosen before we start writing. */
|
|
wmb();
|
|
/* Write to that function's config space. */
|
|
switch (size) {
|
|
case 1:
|
|
writeb(val, addr);
|
|
break;
|
|
case 2:
|
|
writew(val, addr);
|
|
break;
|
|
default:
|
|
writel(val, addr);
|
|
break;
|
|
}
|
|
/*
|
|
* Make sure the write was done before we release the spinlock
|
|
* allowing consecutive reads/writes.
|
|
*/
|
|
mb();
|
|
spin_unlock_irqrestore(&hpdev->hbus->config_lock, flags);
|
|
} else {
|
|
dev_err(&hpdev->hbus->hdev->device,
|
|
"Attempt to write beyond a function's config space.\n");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* hv_pcifront_read_config() - Read configuration space
|
|
* @bus: PCI Bus structure
|
|
* @devfn: Device/function
|
|
* @where: Offset from base
|
|
* @size: Byte/word/dword
|
|
* @val: Value to be read
|
|
*
|
|
* Return: PCIBIOS_SUCCESSFUL on success
|
|
* PCIBIOS_DEVICE_NOT_FOUND on failure
|
|
*/
|
|
static int hv_pcifront_read_config(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 *val)
|
|
{
|
|
struct hv_pcibus_device *hbus =
|
|
container_of(bus->sysdata, struct hv_pcibus_device, sysdata);
|
|
struct hv_pci_dev *hpdev;
|
|
|
|
hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(devfn));
|
|
if (!hpdev)
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
|
|
_hv_pcifront_read_config(hpdev, where, size, val);
|
|
|
|
put_pcichild(hpdev);
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
/**
|
|
* hv_pcifront_write_config() - Write configuration space
|
|
* @bus: PCI Bus structure
|
|
* @devfn: Device/function
|
|
* @where: Offset from base
|
|
* @size: Byte/word/dword
|
|
* @val: Value to be written to device
|
|
*
|
|
* Return: PCIBIOS_SUCCESSFUL on success
|
|
* PCIBIOS_DEVICE_NOT_FOUND on failure
|
|
*/
|
|
static int hv_pcifront_write_config(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 val)
|
|
{
|
|
struct hv_pcibus_device *hbus =
|
|
container_of(bus->sysdata, struct hv_pcibus_device, sysdata);
|
|
struct hv_pci_dev *hpdev;
|
|
|
|
hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(devfn));
|
|
if (!hpdev)
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
|
|
_hv_pcifront_write_config(hpdev, where, size, val);
|
|
|
|
put_pcichild(hpdev);
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
/* PCIe operations */
|
|
static struct pci_ops hv_pcifront_ops = {
|
|
.read = hv_pcifront_read_config,
|
|
.write = hv_pcifront_write_config,
|
|
};
|
|
|
|
/* Interrupt management hooks */
|
|
static void hv_int_desc_free(struct hv_pci_dev *hpdev,
|
|
struct tran_int_desc *int_desc)
|
|
{
|
|
struct pci_delete_interrupt *int_pkt;
|
|
struct {
|
|
struct pci_packet pkt;
|
|
u8 buffer[sizeof(struct pci_delete_interrupt)];
|
|
} ctxt;
|
|
|
|
memset(&ctxt, 0, sizeof(ctxt));
|
|
int_pkt = (struct pci_delete_interrupt *)&ctxt.pkt.message;
|
|
int_pkt->message_type.type =
|
|
PCI_DELETE_INTERRUPT_MESSAGE;
|
|
int_pkt->wslot.slot = hpdev->desc.win_slot.slot;
|
|
int_pkt->int_desc = *int_desc;
|
|
vmbus_sendpacket(hpdev->hbus->hdev->channel, int_pkt, sizeof(*int_pkt),
|
|
(unsigned long)&ctxt.pkt, VM_PKT_DATA_INBAND, 0);
|
|
kfree(int_desc);
|
|
}
|
|
|
|
/**
|
|
* hv_msi_free() - Free the MSI.
|
|
* @domain: The interrupt domain pointer
|
|
* @info: Extra MSI-related context
|
|
* @irq: Identifies the IRQ.
|
|
*
|
|
* The Hyper-V parent partition and hypervisor are tracking the
|
|
* messages that are in use, keeping the interrupt redirection
|
|
* table up to date. This callback sends a message that frees
|
|
* the IRT entry and related tracking nonsense.
|
|
*/
|
|
static void hv_msi_free(struct irq_domain *domain, struct msi_domain_info *info,
|
|
unsigned int irq)
|
|
{
|
|
struct hv_pcibus_device *hbus;
|
|
struct hv_pci_dev *hpdev;
|
|
struct pci_dev *pdev;
|
|
struct tran_int_desc *int_desc;
|
|
struct irq_data *irq_data = irq_domain_get_irq_data(domain, irq);
|
|
struct msi_desc *msi = irq_data_get_msi_desc(irq_data);
|
|
|
|
pdev = msi_desc_to_pci_dev(msi);
|
|
hbus = info->data;
|
|
int_desc = irq_data_get_irq_chip_data(irq_data);
|
|
if (!int_desc)
|
|
return;
|
|
|
|
irq_data->chip_data = NULL;
|
|
hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(pdev->devfn));
|
|
if (!hpdev) {
|
|
kfree(int_desc);
|
|
return;
|
|
}
|
|
|
|
hv_int_desc_free(hpdev, int_desc);
|
|
put_pcichild(hpdev);
|
|
}
|
|
|
|
static int hv_set_affinity(struct irq_data *data, const struct cpumask *dest,
|
|
bool force)
|
|
{
|
|
struct irq_data *parent = data->parent_data;
|
|
|
|
return parent->chip->irq_set_affinity(parent, dest, force);
|
|
}
|
|
|
|
static void hv_irq_mask(struct irq_data *data)
|
|
{
|
|
pci_msi_mask_irq(data);
|
|
}
|
|
|
|
/**
|
|
* hv_irq_unmask() - "Unmask" the IRQ by setting its current
|
|
* affinity.
|
|
* @data: Describes the IRQ
|
|
*
|
|
* Build new a destination for the MSI and make a hypercall to
|
|
* update the Interrupt Redirection Table. "Device Logical ID"
|
|
* is built out of this PCI bus's instance GUID and the function
|
|
* number of the device.
|
|
*/
|
|
static void hv_irq_unmask(struct irq_data *data)
|
|
{
|
|
struct msi_desc *msi_desc = irq_data_get_msi_desc(data);
|
|
struct irq_cfg *cfg = irqd_cfg(data);
|
|
struct retarget_msi_interrupt *params;
|
|
struct hv_pcibus_device *hbus;
|
|
struct cpumask *dest;
|
|
struct pci_bus *pbus;
|
|
struct pci_dev *pdev;
|
|
unsigned long flags;
|
|
u32 var_size = 0;
|
|
int cpu_vmbus;
|
|
int cpu;
|
|
u64 res;
|
|
|
|
dest = irq_data_get_effective_affinity_mask(data);
|
|
pdev = msi_desc_to_pci_dev(msi_desc);
|
|
pbus = pdev->bus;
|
|
hbus = container_of(pbus->sysdata, struct hv_pcibus_device, sysdata);
|
|
|
|
spin_lock_irqsave(&hbus->retarget_msi_interrupt_lock, flags);
|
|
|
|
params = &hbus->retarget_msi_interrupt_params;
|
|
memset(params, 0, sizeof(*params));
|
|
params->partition_id = HV_PARTITION_ID_SELF;
|
|
params->int_entry.source = 1; /* MSI(-X) */
|
|
params->int_entry.address = msi_desc->msg.address_lo;
|
|
params->int_entry.data = msi_desc->msg.data;
|
|
params->device_id = (hbus->hdev->dev_instance.b[5] << 24) |
|
|
(hbus->hdev->dev_instance.b[4] << 16) |
|
|
(hbus->hdev->dev_instance.b[7] << 8) |
|
|
(hbus->hdev->dev_instance.b[6] & 0xf8) |
|
|
PCI_FUNC(pdev->devfn);
|
|
params->int_target.vector = cfg->vector;
|
|
|
|
/*
|
|
* Honoring apic->irq_delivery_mode set to dest_Fixed by
|
|
* setting the HV_DEVICE_INTERRUPT_TARGET_MULTICAST flag results in a
|
|
* spurious interrupt storm. Not doing so does not seem to have a
|
|
* negative effect (yet?).
|
|
*/
|
|
|
|
if (pci_protocol_version >= PCI_PROTOCOL_VERSION_1_2) {
|
|
/*
|
|
* PCI_PROTOCOL_VERSION_1_2 supports the VP_SET version of the
|
|
* HVCALL_RETARGET_INTERRUPT hypercall, which also coincides
|
|
* with >64 VP support.
|
|
* ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED
|
|
* is not sufficient for this hypercall.
|
|
*/
|
|
params->int_target.flags |=
|
|
HV_DEVICE_INTERRUPT_TARGET_PROCESSOR_SET;
|
|
params->int_target.vp_set.valid_banks =
|
|
(1ull << HV_VP_SET_BANK_COUNT_MAX) - 1;
|
|
|
|
/*
|
|
* var-sized hypercall, var-size starts after vp_mask (thus
|
|
* vp_set.format does not count, but vp_set.valid_banks does).
|
|
*/
|
|
var_size = 1 + HV_VP_SET_BANK_COUNT_MAX;
|
|
|
|
for_each_cpu_and(cpu, dest, cpu_online_mask) {
|
|
cpu_vmbus = hv_cpu_number_to_vp_number(cpu);
|
|
|
|
if (cpu_vmbus >= HV_VP_SET_BANK_COUNT_MAX * 64) {
|
|
dev_err(&hbus->hdev->device,
|
|
"too high CPU %d", cpu_vmbus);
|
|
res = 1;
|
|
goto exit_unlock;
|
|
}
|
|
|
|
params->int_target.vp_set.masks[cpu_vmbus / 64] |=
|
|
(1ULL << (cpu_vmbus & 63));
|
|
}
|
|
} else {
|
|
for_each_cpu_and(cpu, dest, cpu_online_mask) {
|
|
params->int_target.vp_mask |=
|
|
(1ULL << hv_cpu_number_to_vp_number(cpu));
|
|
}
|
|
}
|
|
|
|
res = hv_do_hypercall(HVCALL_RETARGET_INTERRUPT | (var_size << 17),
|
|
params, NULL);
|
|
|
|
exit_unlock:
|
|
spin_unlock_irqrestore(&hbus->retarget_msi_interrupt_lock, flags);
|
|
|
|
if (res) {
|
|
dev_err(&hbus->hdev->device,
|
|
"%s() failed: %#llx", __func__, res);
|
|
return;
|
|
}
|
|
|
|
pci_msi_unmask_irq(data);
|
|
}
|
|
|
|
struct compose_comp_ctxt {
|
|
struct hv_pci_compl comp_pkt;
|
|
struct tran_int_desc int_desc;
|
|
};
|
|
|
|
static void hv_pci_compose_compl(void *context, struct pci_response *resp,
|
|
int resp_packet_size)
|
|
{
|
|
struct compose_comp_ctxt *comp_pkt = context;
|
|
struct pci_create_int_response *int_resp =
|
|
(struct pci_create_int_response *)resp;
|
|
|
|
comp_pkt->comp_pkt.completion_status = resp->status;
|
|
comp_pkt->int_desc = int_resp->int_desc;
|
|
complete(&comp_pkt->comp_pkt.host_event);
|
|
}
|
|
|
|
static u32 hv_compose_msi_req_v1(
|
|
struct pci_create_interrupt *int_pkt, struct cpumask *affinity,
|
|
u32 slot, u8 vector)
|
|
{
|
|
int_pkt->message_type.type = PCI_CREATE_INTERRUPT_MESSAGE;
|
|
int_pkt->wslot.slot = slot;
|
|
int_pkt->int_desc.vector = vector;
|
|
int_pkt->int_desc.vector_count = 1;
|
|
int_pkt->int_desc.delivery_mode = dest_Fixed;
|
|
|
|
/*
|
|
* Create MSI w/ dummy vCPU set, overwritten by subsequent retarget in
|
|
* hv_irq_unmask().
|
|
*/
|
|
int_pkt->int_desc.cpu_mask = CPU_AFFINITY_ALL;
|
|
|
|
return sizeof(*int_pkt);
|
|
}
|
|
|
|
static u32 hv_compose_msi_req_v2(
|
|
struct pci_create_interrupt2 *int_pkt, struct cpumask *affinity,
|
|
u32 slot, u8 vector)
|
|
{
|
|
int cpu;
|
|
|
|
int_pkt->message_type.type = PCI_CREATE_INTERRUPT_MESSAGE2;
|
|
int_pkt->wslot.slot = slot;
|
|
int_pkt->int_desc.vector = vector;
|
|
int_pkt->int_desc.vector_count = 1;
|
|
int_pkt->int_desc.delivery_mode = dest_Fixed;
|
|
|
|
/*
|
|
* Create MSI w/ dummy vCPU set targeting just one vCPU, overwritten
|
|
* by subsequent retarget in hv_irq_unmask().
|
|
*/
|
|
cpu = cpumask_first_and(affinity, cpu_online_mask);
|
|
int_pkt->int_desc.processor_array[0] =
|
|
hv_cpu_number_to_vp_number(cpu);
|
|
int_pkt->int_desc.processor_count = 1;
|
|
|
|
return sizeof(*int_pkt);
|
|
}
|
|
|
|
/**
|
|
* hv_compose_msi_msg() - Supplies a valid MSI address/data
|
|
* @data: Everything about this MSI
|
|
* @msg: Buffer that is filled in by this function
|
|
*
|
|
* This function unpacks the IRQ looking for target CPU set, IDT
|
|
* vector and mode and sends a message to the parent partition
|
|
* asking for a mapping for that tuple in this partition. The
|
|
* response supplies a data value and address to which that data
|
|
* should be written to trigger that interrupt.
|
|
*/
|
|
static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
|
|
{
|
|
struct irq_cfg *cfg = irqd_cfg(data);
|
|
struct hv_pcibus_device *hbus;
|
|
struct hv_pci_dev *hpdev;
|
|
struct pci_bus *pbus;
|
|
struct pci_dev *pdev;
|
|
struct cpumask *dest;
|
|
unsigned long flags;
|
|
struct compose_comp_ctxt comp;
|
|
struct tran_int_desc *int_desc;
|
|
struct {
|
|
struct pci_packet pci_pkt;
|
|
union {
|
|
struct pci_create_interrupt v1;
|
|
struct pci_create_interrupt2 v2;
|
|
} int_pkts;
|
|
} __packed ctxt;
|
|
|
|
u32 size;
|
|
int ret;
|
|
|
|
pdev = msi_desc_to_pci_dev(irq_data_get_msi_desc(data));
|
|
dest = irq_data_get_effective_affinity_mask(data);
|
|
pbus = pdev->bus;
|
|
hbus = container_of(pbus->sysdata, struct hv_pcibus_device, sysdata);
|
|
hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(pdev->devfn));
|
|
if (!hpdev)
|
|
goto return_null_message;
|
|
|
|
/* Free any previous message that might have already been composed. */
|
|
if (data->chip_data) {
|
|
int_desc = data->chip_data;
|
|
data->chip_data = NULL;
|
|
hv_int_desc_free(hpdev, int_desc);
|
|
}
|
|
|
|
int_desc = kzalloc(sizeof(*int_desc), GFP_ATOMIC);
|
|
if (!int_desc)
|
|
goto drop_reference;
|
|
|
|
memset(&ctxt, 0, sizeof(ctxt));
|
|
init_completion(&comp.comp_pkt.host_event);
|
|
ctxt.pci_pkt.completion_func = hv_pci_compose_compl;
|
|
ctxt.pci_pkt.compl_ctxt = ∁
|
|
|
|
switch (pci_protocol_version) {
|
|
case PCI_PROTOCOL_VERSION_1_1:
|
|
size = hv_compose_msi_req_v1(&ctxt.int_pkts.v1,
|
|
dest,
|
|
hpdev->desc.win_slot.slot,
|
|
cfg->vector);
|
|
break;
|
|
|
|
case PCI_PROTOCOL_VERSION_1_2:
|
|
size = hv_compose_msi_req_v2(&ctxt.int_pkts.v2,
|
|
dest,
|
|
hpdev->desc.win_slot.slot,
|
|
cfg->vector);
|
|
break;
|
|
|
|
default:
|
|
/* As we only negotiate protocol versions known to this driver,
|
|
* this path should never hit. However, this is it not a hot
|
|
* path so we print a message to aid future updates.
|
|
*/
|
|
dev_err(&hbus->hdev->device,
|
|
"Unexpected vPCI protocol, update driver.");
|
|
goto free_int_desc;
|
|
}
|
|
|
|
ret = vmbus_sendpacket(hpdev->hbus->hdev->channel, &ctxt.int_pkts,
|
|
size, (unsigned long)&ctxt.pci_pkt,
|
|
VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
if (ret) {
|
|
dev_err(&hbus->hdev->device,
|
|
"Sending request for interrupt failed: 0x%x",
|
|
comp.comp_pkt.completion_status);
|
|
goto free_int_desc;
|
|
}
|
|
|
|
/*
|
|
* Since this function is called with IRQ locks held, can't
|
|
* do normal wait for completion; instead poll.
|
|
*/
|
|
while (!try_wait_for_completion(&comp.comp_pkt.host_event)) {
|
|
/* 0xFFFF means an invalid PCI VENDOR ID. */
|
|
if (hv_pcifront_get_vendor_id(hpdev) == 0xFFFF) {
|
|
dev_err_once(&hbus->hdev->device,
|
|
"the device has gone\n");
|
|
goto free_int_desc;
|
|
}
|
|
|
|
/*
|
|
* When the higher level interrupt code calls us with
|
|
* interrupt disabled, we must poll the channel by calling
|
|
* the channel callback directly when channel->target_cpu is
|
|
* the current CPU. When the higher level interrupt code
|
|
* calls us with interrupt enabled, let's add the
|
|
* local_irq_save()/restore() to avoid race:
|
|
* hv_pci_onchannelcallback() can also run in tasklet.
|
|
*/
|
|
local_irq_save(flags);
|
|
|
|
if (hbus->hdev->channel->target_cpu == smp_processor_id())
|
|
hv_pci_onchannelcallback(hbus);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
if (hpdev->state == hv_pcichild_ejecting) {
|
|
dev_err_once(&hbus->hdev->device,
|
|
"the device is being ejected\n");
|
|
goto free_int_desc;
|
|
}
|
|
|
|
udelay(100);
|
|
}
|
|
|
|
if (comp.comp_pkt.completion_status < 0) {
|
|
dev_err(&hbus->hdev->device,
|
|
"Request for interrupt failed: 0x%x",
|
|
comp.comp_pkt.completion_status);
|
|
goto free_int_desc;
|
|
}
|
|
|
|
/*
|
|
* Record the assignment so that this can be unwound later. Using
|
|
* irq_set_chip_data() here would be appropriate, but the lock it takes
|
|
* is already held.
|
|
*/
|
|
*int_desc = comp.int_desc;
|
|
data->chip_data = int_desc;
|
|
|
|
/* Pass up the result. */
|
|
msg->address_hi = comp.int_desc.address >> 32;
|
|
msg->address_lo = comp.int_desc.address & 0xffffffff;
|
|
msg->data = comp.int_desc.data;
|
|
|
|
put_pcichild(hpdev);
|
|
return;
|
|
|
|
free_int_desc:
|
|
kfree(int_desc);
|
|
drop_reference:
|
|
put_pcichild(hpdev);
|
|
return_null_message:
|
|
msg->address_hi = 0;
|
|
msg->address_lo = 0;
|
|
msg->data = 0;
|
|
}
|
|
|
|
/* HW Interrupt Chip Descriptor */
|
|
static struct irq_chip hv_msi_irq_chip = {
|
|
.name = "Hyper-V PCIe MSI",
|
|
.irq_compose_msi_msg = hv_compose_msi_msg,
|
|
.irq_set_affinity = hv_set_affinity,
|
|
.irq_ack = irq_chip_ack_parent,
|
|
.irq_mask = hv_irq_mask,
|
|
.irq_unmask = hv_irq_unmask,
|
|
};
|
|
|
|
static irq_hw_number_t hv_msi_domain_ops_get_hwirq(struct msi_domain_info *info,
|
|
msi_alloc_info_t *arg)
|
|
{
|
|
return arg->msi_hwirq;
|
|
}
|
|
|
|
static struct msi_domain_ops hv_msi_ops = {
|
|
.get_hwirq = hv_msi_domain_ops_get_hwirq,
|
|
.msi_prepare = pci_msi_prepare,
|
|
.set_desc = pci_msi_set_desc,
|
|
.msi_free = hv_msi_free,
|
|
};
|
|
|
|
/**
|
|
* hv_pcie_init_irq_domain() - Initialize IRQ domain
|
|
* @hbus: The root PCI bus
|
|
*
|
|
* This function creates an IRQ domain which will be used for
|
|
* interrupts from devices that have been passed through. These
|
|
* devices only support MSI and MSI-X, not line-based interrupts
|
|
* or simulations of line-based interrupts through PCIe's
|
|
* fabric-layer messages. Because interrupts are remapped, we
|
|
* can support multi-message MSI here.
|
|
*
|
|
* Return: '0' on success and error value on failure
|
|
*/
|
|
static int hv_pcie_init_irq_domain(struct hv_pcibus_device *hbus)
|
|
{
|
|
hbus->msi_info.chip = &hv_msi_irq_chip;
|
|
hbus->msi_info.ops = &hv_msi_ops;
|
|
hbus->msi_info.flags = (MSI_FLAG_USE_DEF_DOM_OPS |
|
|
MSI_FLAG_USE_DEF_CHIP_OPS | MSI_FLAG_MULTI_PCI_MSI |
|
|
MSI_FLAG_PCI_MSIX);
|
|
hbus->msi_info.handler = handle_edge_irq;
|
|
hbus->msi_info.handler_name = "edge";
|
|
hbus->msi_info.data = hbus;
|
|
hbus->irq_domain = pci_msi_create_irq_domain(hbus->sysdata.fwnode,
|
|
&hbus->msi_info,
|
|
x86_vector_domain);
|
|
if (!hbus->irq_domain) {
|
|
dev_err(&hbus->hdev->device,
|
|
"Failed to build an MSI IRQ domain\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* get_bar_size() - Get the address space consumed by a BAR
|
|
* @bar_val: Value that a BAR returned after -1 was written
|
|
* to it.
|
|
*
|
|
* This function returns the size of the BAR, rounded up to 1
|
|
* page. It has to be rounded up because the hypervisor's page
|
|
* table entry that maps the BAR into the VM can't specify an
|
|
* offset within a page. The invariant is that the hypervisor
|
|
* must place any BARs of smaller than page length at the
|
|
* beginning of a page.
|
|
*
|
|
* Return: Size in bytes of the consumed MMIO space.
|
|
*/
|
|
static u64 get_bar_size(u64 bar_val)
|
|
{
|
|
return round_up((1 + ~(bar_val & PCI_BASE_ADDRESS_MEM_MASK)),
|
|
PAGE_SIZE);
|
|
}
|
|
|
|
/**
|
|
* survey_child_resources() - Total all MMIO requirements
|
|
* @hbus: Root PCI bus, as understood by this driver
|
|
*/
|
|
static void survey_child_resources(struct hv_pcibus_device *hbus)
|
|
{
|
|
struct hv_pci_dev *hpdev;
|
|
resource_size_t bar_size = 0;
|
|
unsigned long flags;
|
|
struct completion *event;
|
|
u64 bar_val;
|
|
int i;
|
|
|
|
/* If nobody is waiting on the answer, don't compute it. */
|
|
event = xchg(&hbus->survey_event, NULL);
|
|
if (!event)
|
|
return;
|
|
|
|
/* If the answer has already been computed, go with it. */
|
|
if (hbus->low_mmio_space || hbus->high_mmio_space) {
|
|
complete(event);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&hbus->device_list_lock, flags);
|
|
|
|
/*
|
|
* Due to an interesting quirk of the PCI spec, all memory regions
|
|
* for a child device are a power of 2 in size and aligned in memory,
|
|
* so it's sufficient to just add them up without tracking alignment.
|
|
*/
|
|
list_for_each_entry(hpdev, &hbus->children, list_entry) {
|
|
for (i = 0; i < 6; i++) {
|
|
if (hpdev->probed_bar[i] & PCI_BASE_ADDRESS_SPACE_IO)
|
|
dev_err(&hbus->hdev->device,
|
|
"There's an I/O BAR in this list!\n");
|
|
|
|
if (hpdev->probed_bar[i] != 0) {
|
|
/*
|
|
* A probed BAR has all the upper bits set that
|
|
* can be changed.
|
|
*/
|
|
|
|
bar_val = hpdev->probed_bar[i];
|
|
if (bar_val & PCI_BASE_ADDRESS_MEM_TYPE_64)
|
|
bar_val |=
|
|
((u64)hpdev->probed_bar[++i] << 32);
|
|
else
|
|
bar_val |= 0xffffffff00000000ULL;
|
|
|
|
bar_size = get_bar_size(bar_val);
|
|
|
|
if (bar_val & PCI_BASE_ADDRESS_MEM_TYPE_64)
|
|
hbus->high_mmio_space += bar_size;
|
|
else
|
|
hbus->low_mmio_space += bar_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
|
|
complete(event);
|
|
}
|
|
|
|
/**
|
|
* prepopulate_bars() - Fill in BARs with defaults
|
|
* @hbus: Root PCI bus, as understood by this driver
|
|
*
|
|
* The core PCI driver code seems much, much happier if the BARs
|
|
* for a device have values upon first scan. So fill them in.
|
|
* The algorithm below works down from large sizes to small,
|
|
* attempting to pack the assignments optimally. The assumption,
|
|
* enforced in other parts of the code, is that the beginning of
|
|
* the memory-mapped I/O space will be aligned on the largest
|
|
* BAR size.
|
|
*/
|
|
static void prepopulate_bars(struct hv_pcibus_device *hbus)
|
|
{
|
|
resource_size_t high_size = 0;
|
|
resource_size_t low_size = 0;
|
|
resource_size_t high_base = 0;
|
|
resource_size_t low_base = 0;
|
|
resource_size_t bar_size;
|
|
struct hv_pci_dev *hpdev;
|
|
unsigned long flags;
|
|
u64 bar_val;
|
|
u32 command;
|
|
bool high;
|
|
int i;
|
|
|
|
if (hbus->low_mmio_space) {
|
|
low_size = 1ULL << (63 - __builtin_clzll(hbus->low_mmio_space));
|
|
low_base = hbus->low_mmio_res->start;
|
|
}
|
|
|
|
if (hbus->high_mmio_space) {
|
|
high_size = 1ULL <<
|
|
(63 - __builtin_clzll(hbus->high_mmio_space));
|
|
high_base = hbus->high_mmio_res->start;
|
|
}
|
|
|
|
spin_lock_irqsave(&hbus->device_list_lock, flags);
|
|
|
|
/* Pick addresses for the BARs. */
|
|
do {
|
|
list_for_each_entry(hpdev, &hbus->children, list_entry) {
|
|
for (i = 0; i < 6; i++) {
|
|
bar_val = hpdev->probed_bar[i];
|
|
if (bar_val == 0)
|
|
continue;
|
|
high = bar_val & PCI_BASE_ADDRESS_MEM_TYPE_64;
|
|
if (high) {
|
|
bar_val |=
|
|
((u64)hpdev->probed_bar[i + 1]
|
|
<< 32);
|
|
} else {
|
|
bar_val |= 0xffffffffULL << 32;
|
|
}
|
|
bar_size = get_bar_size(bar_val);
|
|
if (high) {
|
|
if (high_size != bar_size) {
|
|
i++;
|
|
continue;
|
|
}
|
|
_hv_pcifront_write_config(hpdev,
|
|
PCI_BASE_ADDRESS_0 + (4 * i),
|
|
4,
|
|
(u32)(high_base & 0xffffff00));
|
|
i++;
|
|
_hv_pcifront_write_config(hpdev,
|
|
PCI_BASE_ADDRESS_0 + (4 * i),
|
|
4, (u32)(high_base >> 32));
|
|
high_base += bar_size;
|
|
} else {
|
|
if (low_size != bar_size)
|
|
continue;
|
|
_hv_pcifront_write_config(hpdev,
|
|
PCI_BASE_ADDRESS_0 + (4 * i),
|
|
4,
|
|
(u32)(low_base & 0xffffff00));
|
|
low_base += bar_size;
|
|
}
|
|
}
|
|
if (high_size <= 1 && low_size <= 1) {
|
|
/* Set the memory enable bit. */
|
|
_hv_pcifront_read_config(hpdev, PCI_COMMAND, 2,
|
|
&command);
|
|
command |= PCI_COMMAND_MEMORY;
|
|
_hv_pcifront_write_config(hpdev, PCI_COMMAND, 2,
|
|
command);
|
|
break;
|
|
}
|
|
}
|
|
|
|
high_size >>= 1;
|
|
low_size >>= 1;
|
|
} while (high_size || low_size);
|
|
|
|
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Assign entries in sysfs pci slot directory.
|
|
*
|
|
* Note that this function does not need to lock the children list
|
|
* because it is called from pci_devices_present_work which
|
|
* is serialized with hv_eject_device_work because they are on the
|
|
* same ordered workqueue. Therefore hbus->children list will not change
|
|
* even when pci_create_slot sleeps.
|
|
*/
|
|
static void hv_pci_assign_slots(struct hv_pcibus_device *hbus)
|
|
{
|
|
struct hv_pci_dev *hpdev;
|
|
char name[SLOT_NAME_SIZE];
|
|
int slot_nr;
|
|
|
|
list_for_each_entry(hpdev, &hbus->children, list_entry) {
|
|
if (hpdev->pci_slot)
|
|
continue;
|
|
|
|
slot_nr = PCI_SLOT(wslot_to_devfn(hpdev->desc.win_slot.slot));
|
|
snprintf(name, SLOT_NAME_SIZE, "%u", hpdev->desc.ser);
|
|
hpdev->pci_slot = pci_create_slot(hbus->pci_bus, slot_nr,
|
|
name, NULL);
|
|
if (IS_ERR(hpdev->pci_slot)) {
|
|
pr_warn("pci_create slot %s failed\n", name);
|
|
hpdev->pci_slot = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove entries in sysfs pci slot directory.
|
|
*/
|
|
static void hv_pci_remove_slots(struct hv_pcibus_device *hbus)
|
|
{
|
|
struct hv_pci_dev *hpdev;
|
|
|
|
list_for_each_entry(hpdev, &hbus->children, list_entry) {
|
|
if (!hpdev->pci_slot)
|
|
continue;
|
|
pci_destroy_slot(hpdev->pci_slot);
|
|
hpdev->pci_slot = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* create_root_hv_pci_bus() - Expose a new root PCI bus
|
|
* @hbus: Root PCI bus, as understood by this driver
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int create_root_hv_pci_bus(struct hv_pcibus_device *hbus)
|
|
{
|
|
/* Register the device */
|
|
hbus->pci_bus = pci_create_root_bus(&hbus->hdev->device,
|
|
0, /* bus number is always zero */
|
|
&hv_pcifront_ops,
|
|
&hbus->sysdata,
|
|
&hbus->resources_for_children);
|
|
if (!hbus->pci_bus)
|
|
return -ENODEV;
|
|
|
|
hbus->pci_bus->msi = &hbus->msi_chip;
|
|
hbus->pci_bus->msi->dev = &hbus->hdev->device;
|
|
|
|
pci_lock_rescan_remove();
|
|
pci_scan_child_bus(hbus->pci_bus);
|
|
pci_bus_assign_resources(hbus->pci_bus);
|
|
hv_pci_assign_slots(hbus);
|
|
pci_bus_add_devices(hbus->pci_bus);
|
|
pci_unlock_rescan_remove();
|
|
hbus->state = hv_pcibus_installed;
|
|
return 0;
|
|
}
|
|
|
|
struct q_res_req_compl {
|
|
struct completion host_event;
|
|
struct hv_pci_dev *hpdev;
|
|
};
|
|
|
|
/**
|
|
* q_resource_requirements() - Query Resource Requirements
|
|
* @context: The completion context.
|
|
* @resp: The response that came from the host.
|
|
* @resp_packet_size: The size in bytes of resp.
|
|
*
|
|
* This function is invoked on completion of a Query Resource
|
|
* Requirements packet.
|
|
*/
|
|
static void q_resource_requirements(void *context, struct pci_response *resp,
|
|
int resp_packet_size)
|
|
{
|
|
struct q_res_req_compl *completion = context;
|
|
struct pci_q_res_req_response *q_res_req =
|
|
(struct pci_q_res_req_response *)resp;
|
|
int i;
|
|
|
|
if (resp->status < 0) {
|
|
dev_err(&completion->hpdev->hbus->hdev->device,
|
|
"query resource requirements failed: %x\n",
|
|
resp->status);
|
|
} else {
|
|
for (i = 0; i < 6; i++) {
|
|
completion->hpdev->probed_bar[i] =
|
|
q_res_req->probed_bar[i];
|
|
}
|
|
}
|
|
|
|
complete(&completion->host_event);
|
|
}
|
|
|
|
/**
|
|
* new_pcichild_device() - Create a new child device
|
|
* @hbus: The internal struct tracking this root PCI bus.
|
|
* @desc: The information supplied so far from the host
|
|
* about the device.
|
|
*
|
|
* This function creates the tracking structure for a new child
|
|
* device and kicks off the process of figuring out what it is.
|
|
*
|
|
* Return: Pointer to the new tracking struct
|
|
*/
|
|
static struct hv_pci_dev *new_pcichild_device(struct hv_pcibus_device *hbus,
|
|
struct pci_function_description *desc)
|
|
{
|
|
struct hv_pci_dev *hpdev;
|
|
struct pci_child_message *res_req;
|
|
struct q_res_req_compl comp_pkt;
|
|
struct {
|
|
struct pci_packet init_packet;
|
|
u8 buffer[sizeof(struct pci_child_message)];
|
|
} pkt;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
hpdev = kzalloc(sizeof(*hpdev), GFP_KERNEL);
|
|
if (!hpdev)
|
|
return NULL;
|
|
|
|
hpdev->hbus = hbus;
|
|
|
|
memset(&pkt, 0, sizeof(pkt));
|
|
init_completion(&comp_pkt.host_event);
|
|
comp_pkt.hpdev = hpdev;
|
|
pkt.init_packet.compl_ctxt = &comp_pkt;
|
|
pkt.init_packet.completion_func = q_resource_requirements;
|
|
res_req = (struct pci_child_message *)&pkt.init_packet.message;
|
|
res_req->message_type.type = PCI_QUERY_RESOURCE_REQUIREMENTS;
|
|
res_req->wslot.slot = desc->win_slot.slot;
|
|
|
|
ret = vmbus_sendpacket(hbus->hdev->channel, res_req,
|
|
sizeof(struct pci_child_message),
|
|
(unsigned long)&pkt.init_packet,
|
|
VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
if (ret)
|
|
goto error;
|
|
|
|
if (wait_for_response(hbus->hdev, &comp_pkt.host_event))
|
|
goto error;
|
|
|
|
hpdev->desc = *desc;
|
|
refcount_set(&hpdev->refs, 1);
|
|
get_pcichild(hpdev);
|
|
spin_lock_irqsave(&hbus->device_list_lock, flags);
|
|
|
|
list_add_tail(&hpdev->list_entry, &hbus->children);
|
|
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
|
|
return hpdev;
|
|
|
|
error:
|
|
kfree(hpdev);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* get_pcichild_wslot() - Find device from slot
|
|
* @hbus: Root PCI bus, as understood by this driver
|
|
* @wslot: Location on the bus
|
|
*
|
|
* This function looks up a PCI device and returns the internal
|
|
* representation of it. It acquires a reference on it, so that
|
|
* the device won't be deleted while somebody is using it. The
|
|
* caller is responsible for calling put_pcichild() to release
|
|
* this reference.
|
|
*
|
|
* Return: Internal representation of a PCI device
|
|
*/
|
|
static struct hv_pci_dev *get_pcichild_wslot(struct hv_pcibus_device *hbus,
|
|
u32 wslot)
|
|
{
|
|
unsigned long flags;
|
|
struct hv_pci_dev *iter, *hpdev = NULL;
|
|
|
|
spin_lock_irqsave(&hbus->device_list_lock, flags);
|
|
list_for_each_entry(iter, &hbus->children, list_entry) {
|
|
if (iter->desc.win_slot.slot == wslot) {
|
|
hpdev = iter;
|
|
get_pcichild(hpdev);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
|
|
|
|
return hpdev;
|
|
}
|
|
|
|
/**
|
|
* pci_devices_present_work() - Handle new list of child devices
|
|
* @work: Work struct embedded in struct hv_dr_work
|
|
*
|
|
* "Bus Relations" is the Windows term for "children of this
|
|
* bus." The terminology is preserved here for people trying to
|
|
* debug the interaction between Hyper-V and Linux. This
|
|
* function is called when the parent partition reports a list
|
|
* of functions that should be observed under this PCI Express
|
|
* port (bus).
|
|
*
|
|
* This function updates the list, and must tolerate being
|
|
* called multiple times with the same information. The typical
|
|
* number of child devices is one, with very atypical cases
|
|
* involving three or four, so the algorithms used here can be
|
|
* simple and inefficient.
|
|
*
|
|
* It must also treat the omission of a previously observed device as
|
|
* notification that the device no longer exists.
|
|
*
|
|
* Note that this function is serialized with hv_eject_device_work(),
|
|
* because both are pushed to the ordered workqueue hbus->wq.
|
|
*/
|
|
static void pci_devices_present_work(struct work_struct *work)
|
|
{
|
|
u32 child_no;
|
|
bool found;
|
|
struct pci_function_description *new_desc;
|
|
struct hv_pci_dev *hpdev;
|
|
struct hv_pcibus_device *hbus;
|
|
struct list_head removed;
|
|
struct hv_dr_work *dr_wrk;
|
|
struct hv_dr_state *dr = NULL;
|
|
unsigned long flags;
|
|
|
|
dr_wrk = container_of(work, struct hv_dr_work, wrk);
|
|
hbus = dr_wrk->bus;
|
|
kfree(dr_wrk);
|
|
|
|
INIT_LIST_HEAD(&removed);
|
|
|
|
/* Pull this off the queue and process it if it was the last one. */
|
|
spin_lock_irqsave(&hbus->device_list_lock, flags);
|
|
while (!list_empty(&hbus->dr_list)) {
|
|
dr = list_first_entry(&hbus->dr_list, struct hv_dr_state,
|
|
list_entry);
|
|
list_del(&dr->list_entry);
|
|
|
|
/* Throw this away if the list still has stuff in it. */
|
|
if (!list_empty(&hbus->dr_list)) {
|
|
kfree(dr);
|
|
continue;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
|
|
|
|
if (!dr) {
|
|
put_hvpcibus(hbus);
|
|
return;
|
|
}
|
|
|
|
/* First, mark all existing children as reported missing. */
|
|
spin_lock_irqsave(&hbus->device_list_lock, flags);
|
|
list_for_each_entry(hpdev, &hbus->children, list_entry) {
|
|
hpdev->reported_missing = true;
|
|
}
|
|
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
|
|
|
|
/* Next, add back any reported devices. */
|
|
for (child_no = 0; child_no < dr->device_count; child_no++) {
|
|
found = false;
|
|
new_desc = &dr->func[child_no];
|
|
|
|
spin_lock_irqsave(&hbus->device_list_lock, flags);
|
|
list_for_each_entry(hpdev, &hbus->children, list_entry) {
|
|
if ((hpdev->desc.win_slot.slot == new_desc->win_slot.slot) &&
|
|
(hpdev->desc.v_id == new_desc->v_id) &&
|
|
(hpdev->desc.d_id == new_desc->d_id) &&
|
|
(hpdev->desc.ser == new_desc->ser)) {
|
|
hpdev->reported_missing = false;
|
|
found = true;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
|
|
|
|
if (!found) {
|
|
hpdev = new_pcichild_device(hbus, new_desc);
|
|
if (!hpdev)
|
|
dev_err(&hbus->hdev->device,
|
|
"couldn't record a child device.\n");
|
|
}
|
|
}
|
|
|
|
/* Move missing children to a list on the stack. */
|
|
spin_lock_irqsave(&hbus->device_list_lock, flags);
|
|
do {
|
|
found = false;
|
|
list_for_each_entry(hpdev, &hbus->children, list_entry) {
|
|
if (hpdev->reported_missing) {
|
|
found = true;
|
|
put_pcichild(hpdev);
|
|
list_move_tail(&hpdev->list_entry, &removed);
|
|
break;
|
|
}
|
|
}
|
|
} while (found);
|
|
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
|
|
|
|
/* Delete everything that should no longer exist. */
|
|
while (!list_empty(&removed)) {
|
|
hpdev = list_first_entry(&removed, struct hv_pci_dev,
|
|
list_entry);
|
|
list_del(&hpdev->list_entry);
|
|
|
|
if (hpdev->pci_slot)
|
|
pci_destroy_slot(hpdev->pci_slot);
|
|
|
|
put_pcichild(hpdev);
|
|
}
|
|
|
|
switch (hbus->state) {
|
|
case hv_pcibus_installed:
|
|
/*
|
|
* Tell the core to rescan bus
|
|
* because there may have been changes.
|
|
*/
|
|
pci_lock_rescan_remove();
|
|
pci_scan_child_bus(hbus->pci_bus);
|
|
hv_pci_assign_slots(hbus);
|
|
pci_unlock_rescan_remove();
|
|
break;
|
|
|
|
case hv_pcibus_init:
|
|
case hv_pcibus_probed:
|
|
survey_child_resources(hbus);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
put_hvpcibus(hbus);
|
|
kfree(dr);
|
|
}
|
|
|
|
/**
|
|
* hv_pci_devices_present() - Handles list of new children
|
|
* @hbus: Root PCI bus, as understood by this driver
|
|
* @relations: Packet from host listing children
|
|
*
|
|
* This function is invoked whenever a new list of devices for
|
|
* this bus appears.
|
|
*/
|
|
static void hv_pci_devices_present(struct hv_pcibus_device *hbus,
|
|
struct pci_bus_relations *relations)
|
|
{
|
|
struct hv_dr_state *dr;
|
|
struct hv_dr_work *dr_wrk;
|
|
unsigned long flags;
|
|
bool pending_dr;
|
|
|
|
dr_wrk = kzalloc(sizeof(*dr_wrk), GFP_NOWAIT);
|
|
if (!dr_wrk)
|
|
return;
|
|
|
|
dr = kzalloc(offsetof(struct hv_dr_state, func) +
|
|
(sizeof(struct pci_function_description) *
|
|
(relations->device_count)), GFP_NOWAIT);
|
|
if (!dr) {
|
|
kfree(dr_wrk);
|
|
return;
|
|
}
|
|
|
|
INIT_WORK(&dr_wrk->wrk, pci_devices_present_work);
|
|
dr_wrk->bus = hbus;
|
|
dr->device_count = relations->device_count;
|
|
if (dr->device_count != 0) {
|
|
memcpy(dr->func, relations->func,
|
|
sizeof(struct pci_function_description) *
|
|
dr->device_count);
|
|
}
|
|
|
|
spin_lock_irqsave(&hbus->device_list_lock, flags);
|
|
/*
|
|
* If pending_dr is true, we have already queued a work,
|
|
* which will see the new dr. Otherwise, we need to
|
|
* queue a new work.
|
|
*/
|
|
pending_dr = !list_empty(&hbus->dr_list);
|
|
list_add_tail(&dr->list_entry, &hbus->dr_list);
|
|
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
|
|
|
|
if (pending_dr) {
|
|
kfree(dr_wrk);
|
|
} else {
|
|
get_hvpcibus(hbus);
|
|
queue_work(hbus->wq, &dr_wrk->wrk);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* hv_eject_device_work() - Asynchronously handles ejection
|
|
* @work: Work struct embedded in internal device struct
|
|
*
|
|
* This function handles ejecting a device. Windows will
|
|
* attempt to gracefully eject a device, waiting 60 seconds to
|
|
* hear back from the guest OS that this completed successfully.
|
|
* If this timer expires, the device will be forcibly removed.
|
|
*/
|
|
static void hv_eject_device_work(struct work_struct *work)
|
|
{
|
|
struct pci_eject_response *ejct_pkt;
|
|
struct hv_pcibus_device *hbus;
|
|
struct hv_pci_dev *hpdev;
|
|
struct pci_dev *pdev;
|
|
unsigned long flags;
|
|
int wslot;
|
|
struct {
|
|
struct pci_packet pkt;
|
|
u8 buffer[sizeof(struct pci_eject_response)];
|
|
} ctxt;
|
|
|
|
hpdev = container_of(work, struct hv_pci_dev, wrk);
|
|
hbus = hpdev->hbus;
|
|
|
|
WARN_ON(hpdev->state != hv_pcichild_ejecting);
|
|
|
|
/*
|
|
* Ejection can come before or after the PCI bus has been set up, so
|
|
* attempt to find it and tear down the bus state, if it exists. This
|
|
* must be done without constructs like pci_domain_nr(hbus->pci_bus)
|
|
* because hbus->pci_bus may not exist yet.
|
|
*/
|
|
wslot = wslot_to_devfn(hpdev->desc.win_slot.slot);
|
|
pdev = pci_get_domain_bus_and_slot(hbus->sysdata.domain, 0, wslot);
|
|
if (pdev) {
|
|
pci_lock_rescan_remove();
|
|
pci_stop_and_remove_bus_device(pdev);
|
|
pci_dev_put(pdev);
|
|
pci_unlock_rescan_remove();
|
|
}
|
|
|
|
spin_lock_irqsave(&hbus->device_list_lock, flags);
|
|
list_del(&hpdev->list_entry);
|
|
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
|
|
|
|
if (hpdev->pci_slot)
|
|
pci_destroy_slot(hpdev->pci_slot);
|
|
|
|
memset(&ctxt, 0, sizeof(ctxt));
|
|
ejct_pkt = (struct pci_eject_response *)&ctxt.pkt.message;
|
|
ejct_pkt->message_type.type = PCI_EJECTION_COMPLETE;
|
|
ejct_pkt->wslot.slot = hpdev->desc.win_slot.slot;
|
|
vmbus_sendpacket(hbus->hdev->channel, ejct_pkt,
|
|
sizeof(*ejct_pkt), (unsigned long)&ctxt.pkt,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
/* For the get_pcichild() in hv_pci_eject_device() */
|
|
put_pcichild(hpdev);
|
|
/* For the two refs got in new_pcichild_device() */
|
|
put_pcichild(hpdev);
|
|
put_pcichild(hpdev);
|
|
/* hpdev has been freed. Do not use it any more. */
|
|
|
|
put_hvpcibus(hbus);
|
|
}
|
|
|
|
/**
|
|
* hv_pci_eject_device() - Handles device ejection
|
|
* @hpdev: Internal device tracking struct
|
|
*
|
|
* This function is invoked when an ejection packet arrives. It
|
|
* just schedules work so that we don't re-enter the packet
|
|
* delivery code handling the ejection.
|
|
*/
|
|
static void hv_pci_eject_device(struct hv_pci_dev *hpdev)
|
|
{
|
|
hpdev->state = hv_pcichild_ejecting;
|
|
get_pcichild(hpdev);
|
|
INIT_WORK(&hpdev->wrk, hv_eject_device_work);
|
|
get_hvpcibus(hpdev->hbus);
|
|
queue_work(hpdev->hbus->wq, &hpdev->wrk);
|
|
}
|
|
|
|
/**
|
|
* hv_pci_onchannelcallback() - Handles incoming packets
|
|
* @context: Internal bus tracking struct
|
|
*
|
|
* This function is invoked whenever the host sends a packet to
|
|
* this channel (which is private to this root PCI bus).
|
|
*/
|
|
static void hv_pci_onchannelcallback(void *context)
|
|
{
|
|
const int packet_size = 0x100;
|
|
int ret;
|
|
struct hv_pcibus_device *hbus = context;
|
|
u32 bytes_recvd;
|
|
u64 req_id;
|
|
struct vmpacket_descriptor *desc;
|
|
unsigned char *buffer;
|
|
int bufferlen = packet_size;
|
|
struct pci_packet *comp_packet;
|
|
struct pci_response *response;
|
|
struct pci_incoming_message *new_message;
|
|
struct pci_bus_relations *bus_rel;
|
|
struct pci_dev_incoming *dev_message;
|
|
struct hv_pci_dev *hpdev;
|
|
|
|
buffer = kmalloc(bufferlen, GFP_ATOMIC);
|
|
if (!buffer)
|
|
return;
|
|
|
|
while (1) {
|
|
ret = vmbus_recvpacket_raw(hbus->hdev->channel, buffer,
|
|
bufferlen, &bytes_recvd, &req_id);
|
|
|
|
if (ret == -ENOBUFS) {
|
|
kfree(buffer);
|
|
/* Handle large packet */
|
|
bufferlen = bytes_recvd;
|
|
buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
|
|
if (!buffer)
|
|
return;
|
|
continue;
|
|
}
|
|
|
|
/* Zero length indicates there are no more packets. */
|
|
if (ret || !bytes_recvd)
|
|
break;
|
|
|
|
/*
|
|
* All incoming packets must be at least as large as a
|
|
* response.
|
|
*/
|
|
if (bytes_recvd <= sizeof(struct pci_response))
|
|
continue;
|
|
desc = (struct vmpacket_descriptor *)buffer;
|
|
|
|
switch (desc->type) {
|
|
case VM_PKT_COMP:
|
|
|
|
/*
|
|
* The host is trusted, and thus it's safe to interpret
|
|
* this transaction ID as a pointer.
|
|
*/
|
|
comp_packet = (struct pci_packet *)req_id;
|
|
response = (struct pci_response *)buffer;
|
|
comp_packet->completion_func(comp_packet->compl_ctxt,
|
|
response,
|
|
bytes_recvd);
|
|
break;
|
|
|
|
case VM_PKT_DATA_INBAND:
|
|
|
|
new_message = (struct pci_incoming_message *)buffer;
|
|
switch (new_message->message_type.type) {
|
|
case PCI_BUS_RELATIONS:
|
|
|
|
bus_rel = (struct pci_bus_relations *)buffer;
|
|
if (bytes_recvd <
|
|
offsetof(struct pci_bus_relations, func) +
|
|
(sizeof(struct pci_function_description) *
|
|
(bus_rel->device_count))) {
|
|
dev_err(&hbus->hdev->device,
|
|
"bus relations too small\n");
|
|
break;
|
|
}
|
|
|
|
hv_pci_devices_present(hbus, bus_rel);
|
|
break;
|
|
|
|
case PCI_EJECT:
|
|
|
|
dev_message = (struct pci_dev_incoming *)buffer;
|
|
hpdev = get_pcichild_wslot(hbus,
|
|
dev_message->wslot.slot);
|
|
if (hpdev) {
|
|
hv_pci_eject_device(hpdev);
|
|
put_pcichild(hpdev);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
dev_warn(&hbus->hdev->device,
|
|
"Unimplemented protocol message %x\n",
|
|
new_message->message_type.type);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
dev_err(&hbus->hdev->device,
|
|
"unhandled packet type %d, tid %llx len %d\n",
|
|
desc->type, req_id, bytes_recvd);
|
|
break;
|
|
}
|
|
}
|
|
|
|
kfree(buffer);
|
|
}
|
|
|
|
/**
|
|
* hv_pci_protocol_negotiation() - Set up protocol
|
|
* @hdev: VMBus's tracking struct for this root PCI bus
|
|
*
|
|
* This driver is intended to support running on Windows 10
|
|
* (server) and later versions. It will not run on earlier
|
|
* versions, as they assume that many of the operations which
|
|
* Linux needs accomplished with a spinlock held were done via
|
|
* asynchronous messaging via VMBus. Windows 10 increases the
|
|
* surface area of PCI emulation so that these actions can take
|
|
* place by suspending a virtual processor for their duration.
|
|
*
|
|
* This function negotiates the channel protocol version,
|
|
* failing if the host doesn't support the necessary protocol
|
|
* level.
|
|
*/
|
|
static int hv_pci_protocol_negotiation(struct hv_device *hdev)
|
|
{
|
|
struct pci_version_request *version_req;
|
|
struct hv_pci_compl comp_pkt;
|
|
struct pci_packet *pkt;
|
|
int ret;
|
|
int i;
|
|
|
|
/*
|
|
* Initiate the handshake with the host and negotiate
|
|
* a version that the host can support. We start with the
|
|
* highest version number and go down if the host cannot
|
|
* support it.
|
|
*/
|
|
pkt = kzalloc(sizeof(*pkt) + sizeof(*version_req), GFP_KERNEL);
|
|
if (!pkt)
|
|
return -ENOMEM;
|
|
|
|
init_completion(&comp_pkt.host_event);
|
|
pkt->completion_func = hv_pci_generic_compl;
|
|
pkt->compl_ctxt = &comp_pkt;
|
|
version_req = (struct pci_version_request *)&pkt->message;
|
|
version_req->message_type.type = PCI_QUERY_PROTOCOL_VERSION;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(pci_protocol_versions); i++) {
|
|
version_req->protocol_version = pci_protocol_versions[i];
|
|
ret = vmbus_sendpacket(hdev->channel, version_req,
|
|
sizeof(struct pci_version_request),
|
|
(unsigned long)pkt, VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
if (!ret)
|
|
ret = wait_for_response(hdev, &comp_pkt.host_event);
|
|
|
|
if (ret) {
|
|
dev_err(&hdev->device,
|
|
"PCI Pass-through VSP failed to request version: %d",
|
|
ret);
|
|
goto exit;
|
|
}
|
|
|
|
if (comp_pkt.completion_status >= 0) {
|
|
pci_protocol_version = pci_protocol_versions[i];
|
|
dev_info(&hdev->device,
|
|
"PCI VMBus probing: Using version %#x\n",
|
|
pci_protocol_version);
|
|
goto exit;
|
|
}
|
|
|
|
if (comp_pkt.completion_status != STATUS_REVISION_MISMATCH) {
|
|
dev_err(&hdev->device,
|
|
"PCI Pass-through VSP failed version request: %#x",
|
|
comp_pkt.completion_status);
|
|
ret = -EPROTO;
|
|
goto exit;
|
|
}
|
|
|
|
reinit_completion(&comp_pkt.host_event);
|
|
}
|
|
|
|
dev_err(&hdev->device,
|
|
"PCI pass-through VSP failed to find supported version");
|
|
ret = -EPROTO;
|
|
|
|
exit:
|
|
kfree(pkt);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* hv_pci_free_bridge_windows() - Release memory regions for the
|
|
* bus
|
|
* @hbus: Root PCI bus, as understood by this driver
|
|
*/
|
|
static void hv_pci_free_bridge_windows(struct hv_pcibus_device *hbus)
|
|
{
|
|
/*
|
|
* Set the resources back to the way they looked when they
|
|
* were allocated by setting IORESOURCE_BUSY again.
|
|
*/
|
|
|
|
if (hbus->low_mmio_space && hbus->low_mmio_res) {
|
|
hbus->low_mmio_res->flags |= IORESOURCE_BUSY;
|
|
vmbus_free_mmio(hbus->low_mmio_res->start,
|
|
resource_size(hbus->low_mmio_res));
|
|
}
|
|
|
|
if (hbus->high_mmio_space && hbus->high_mmio_res) {
|
|
hbus->high_mmio_res->flags |= IORESOURCE_BUSY;
|
|
vmbus_free_mmio(hbus->high_mmio_res->start,
|
|
resource_size(hbus->high_mmio_res));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* hv_pci_allocate_bridge_windows() - Allocate memory regions
|
|
* for the bus
|
|
* @hbus: Root PCI bus, as understood by this driver
|
|
*
|
|
* This function calls vmbus_allocate_mmio(), which is itself a
|
|
* bit of a compromise. Ideally, we might change the pnp layer
|
|
* in the kernel such that it comprehends either PCI devices
|
|
* which are "grandchildren of ACPI," with some intermediate bus
|
|
* node (in this case, VMBus) or change it such that it
|
|
* understands VMBus. The pnp layer, however, has been declared
|
|
* deprecated, and not subject to change.
|
|
*
|
|
* The workaround, implemented here, is to ask VMBus to allocate
|
|
* MMIO space for this bus. VMBus itself knows which ranges are
|
|
* appropriate by looking at its own ACPI objects. Then, after
|
|
* these ranges are claimed, they're modified to look like they
|
|
* would have looked if the ACPI and pnp code had allocated
|
|
* bridge windows. These descriptors have to exist in this form
|
|
* in order to satisfy the code which will get invoked when the
|
|
* endpoint PCI function driver calls request_mem_region() or
|
|
* request_mem_region_exclusive().
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int hv_pci_allocate_bridge_windows(struct hv_pcibus_device *hbus)
|
|
{
|
|
resource_size_t align;
|
|
int ret;
|
|
|
|
if (hbus->low_mmio_space) {
|
|
align = 1ULL << (63 - __builtin_clzll(hbus->low_mmio_space));
|
|
ret = vmbus_allocate_mmio(&hbus->low_mmio_res, hbus->hdev, 0,
|
|
(u64)(u32)0xffffffff,
|
|
hbus->low_mmio_space,
|
|
align, false);
|
|
if (ret) {
|
|
dev_err(&hbus->hdev->device,
|
|
"Need %#llx of low MMIO space. Consider reconfiguring the VM.\n",
|
|
hbus->low_mmio_space);
|
|
return ret;
|
|
}
|
|
|
|
/* Modify this resource to become a bridge window. */
|
|
hbus->low_mmio_res->flags |= IORESOURCE_WINDOW;
|
|
hbus->low_mmio_res->flags &= ~IORESOURCE_BUSY;
|
|
pci_add_resource(&hbus->resources_for_children,
|
|
hbus->low_mmio_res);
|
|
}
|
|
|
|
if (hbus->high_mmio_space) {
|
|
align = 1ULL << (63 - __builtin_clzll(hbus->high_mmio_space));
|
|
ret = vmbus_allocate_mmio(&hbus->high_mmio_res, hbus->hdev,
|
|
0x100000000, -1,
|
|
hbus->high_mmio_space, align,
|
|
false);
|
|
if (ret) {
|
|
dev_err(&hbus->hdev->device,
|
|
"Need %#llx of high MMIO space. Consider reconfiguring the VM.\n",
|
|
hbus->high_mmio_space);
|
|
goto release_low_mmio;
|
|
}
|
|
|
|
/* Modify this resource to become a bridge window. */
|
|
hbus->high_mmio_res->flags |= IORESOURCE_WINDOW;
|
|
hbus->high_mmio_res->flags &= ~IORESOURCE_BUSY;
|
|
pci_add_resource(&hbus->resources_for_children,
|
|
hbus->high_mmio_res);
|
|
}
|
|
|
|
return 0;
|
|
|
|
release_low_mmio:
|
|
if (hbus->low_mmio_res) {
|
|
vmbus_free_mmio(hbus->low_mmio_res->start,
|
|
resource_size(hbus->low_mmio_res));
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* hv_allocate_config_window() - Find MMIO space for PCI Config
|
|
* @hbus: Root PCI bus, as understood by this driver
|
|
*
|
|
* This function claims memory-mapped I/O space for accessing
|
|
* configuration space for the functions on this bus.
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int hv_allocate_config_window(struct hv_pcibus_device *hbus)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Set up a region of MMIO space to use for accessing configuration
|
|
* space.
|
|
*/
|
|
ret = vmbus_allocate_mmio(&hbus->mem_config, hbus->hdev, 0, -1,
|
|
PCI_CONFIG_MMIO_LENGTH, 0x1000, false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* vmbus_allocate_mmio() gets used for allocating both device endpoint
|
|
* resource claims (those which cannot be overlapped) and the ranges
|
|
* which are valid for the children of this bus, which are intended
|
|
* to be overlapped by those children. Set the flag on this claim
|
|
* meaning that this region can't be overlapped.
|
|
*/
|
|
|
|
hbus->mem_config->flags |= IORESOURCE_BUSY;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void hv_free_config_window(struct hv_pcibus_device *hbus)
|
|
{
|
|
vmbus_free_mmio(hbus->mem_config->start, PCI_CONFIG_MMIO_LENGTH);
|
|
}
|
|
|
|
/**
|
|
* hv_pci_enter_d0() - Bring the "bus" into the D0 power state
|
|
* @hdev: VMBus's tracking struct for this root PCI bus
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int hv_pci_enter_d0(struct hv_device *hdev)
|
|
{
|
|
struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
|
|
struct pci_bus_d0_entry *d0_entry;
|
|
struct hv_pci_compl comp_pkt;
|
|
struct pci_packet *pkt;
|
|
int ret;
|
|
|
|
/*
|
|
* Tell the host that the bus is ready to use, and moved into the
|
|
* powered-on state. This includes telling the host which region
|
|
* of memory-mapped I/O space has been chosen for configuration space
|
|
* access.
|
|
*/
|
|
pkt = kzalloc(sizeof(*pkt) + sizeof(*d0_entry), GFP_KERNEL);
|
|
if (!pkt)
|
|
return -ENOMEM;
|
|
|
|
init_completion(&comp_pkt.host_event);
|
|
pkt->completion_func = hv_pci_generic_compl;
|
|
pkt->compl_ctxt = &comp_pkt;
|
|
d0_entry = (struct pci_bus_d0_entry *)&pkt->message;
|
|
d0_entry->message_type.type = PCI_BUS_D0ENTRY;
|
|
d0_entry->mmio_base = hbus->mem_config->start;
|
|
|
|
ret = vmbus_sendpacket(hdev->channel, d0_entry, sizeof(*d0_entry),
|
|
(unsigned long)pkt, VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
if (!ret)
|
|
ret = wait_for_response(hdev, &comp_pkt.host_event);
|
|
|
|
if (ret)
|
|
goto exit;
|
|
|
|
if (comp_pkt.completion_status < 0) {
|
|
dev_err(&hdev->device,
|
|
"PCI Pass-through VSP failed D0 Entry with status %x\n",
|
|
comp_pkt.completion_status);
|
|
ret = -EPROTO;
|
|
goto exit;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
exit:
|
|
kfree(pkt);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* hv_pci_query_relations() - Ask host to send list of child
|
|
* devices
|
|
* @hdev: VMBus's tracking struct for this root PCI bus
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int hv_pci_query_relations(struct hv_device *hdev)
|
|
{
|
|
struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
|
|
struct pci_message message;
|
|
struct completion comp;
|
|
int ret;
|
|
|
|
/* Ask the host to send along the list of child devices */
|
|
init_completion(&comp);
|
|
if (cmpxchg(&hbus->survey_event, NULL, &comp))
|
|
return -ENOTEMPTY;
|
|
|
|
memset(&message, 0, sizeof(message));
|
|
message.type = PCI_QUERY_BUS_RELATIONS;
|
|
|
|
ret = vmbus_sendpacket(hdev->channel, &message, sizeof(message),
|
|
0, VM_PKT_DATA_INBAND, 0);
|
|
if (!ret)
|
|
ret = wait_for_response(hdev, &comp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* hv_send_resources_allocated() - Report local resource choices
|
|
* @hdev: VMBus's tracking struct for this root PCI bus
|
|
*
|
|
* The host OS is expecting to be sent a request as a message
|
|
* which contains all the resources that the device will use.
|
|
* The response contains those same resources, "translated"
|
|
* which is to say, the values which should be used by the
|
|
* hardware, when it delivers an interrupt. (MMIO resources are
|
|
* used in local terms.) This is nice for Windows, and lines up
|
|
* with the FDO/PDO split, which doesn't exist in Linux. Linux
|
|
* is deeply expecting to scan an emulated PCI configuration
|
|
* space. So this message is sent here only to drive the state
|
|
* machine on the host forward.
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int hv_send_resources_allocated(struct hv_device *hdev)
|
|
{
|
|
struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
|
|
struct pci_resources_assigned *res_assigned;
|
|
struct pci_resources_assigned2 *res_assigned2;
|
|
struct hv_pci_compl comp_pkt;
|
|
struct hv_pci_dev *hpdev;
|
|
struct pci_packet *pkt;
|
|
size_t size_res;
|
|
u32 wslot;
|
|
int ret;
|
|
|
|
size_res = (pci_protocol_version < PCI_PROTOCOL_VERSION_1_2)
|
|
? sizeof(*res_assigned) : sizeof(*res_assigned2);
|
|
|
|
pkt = kmalloc(sizeof(*pkt) + size_res, GFP_KERNEL);
|
|
if (!pkt)
|
|
return -ENOMEM;
|
|
|
|
ret = 0;
|
|
|
|
for (wslot = 0; wslot < 256; wslot++) {
|
|
hpdev = get_pcichild_wslot(hbus, wslot);
|
|
if (!hpdev)
|
|
continue;
|
|
|
|
memset(pkt, 0, sizeof(*pkt) + size_res);
|
|
init_completion(&comp_pkt.host_event);
|
|
pkt->completion_func = hv_pci_generic_compl;
|
|
pkt->compl_ctxt = &comp_pkt;
|
|
|
|
if (pci_protocol_version < PCI_PROTOCOL_VERSION_1_2) {
|
|
res_assigned =
|
|
(struct pci_resources_assigned *)&pkt->message;
|
|
res_assigned->message_type.type =
|
|
PCI_RESOURCES_ASSIGNED;
|
|
res_assigned->wslot.slot = hpdev->desc.win_slot.slot;
|
|
} else {
|
|
res_assigned2 =
|
|
(struct pci_resources_assigned2 *)&pkt->message;
|
|
res_assigned2->message_type.type =
|
|
PCI_RESOURCES_ASSIGNED2;
|
|
res_assigned2->wslot.slot = hpdev->desc.win_slot.slot;
|
|
}
|
|
put_pcichild(hpdev);
|
|
|
|
ret = vmbus_sendpacket(hdev->channel, &pkt->message,
|
|
size_res, (unsigned long)pkt,
|
|
VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
if (!ret)
|
|
ret = wait_for_response(hdev, &comp_pkt.host_event);
|
|
if (ret)
|
|
break;
|
|
|
|
if (comp_pkt.completion_status < 0) {
|
|
ret = -EPROTO;
|
|
dev_err(&hdev->device,
|
|
"resource allocated returned 0x%x",
|
|
comp_pkt.completion_status);
|
|
break;
|
|
}
|
|
}
|
|
|
|
kfree(pkt);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* hv_send_resources_released() - Report local resources
|
|
* released
|
|
* @hdev: VMBus's tracking struct for this root PCI bus
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int hv_send_resources_released(struct hv_device *hdev)
|
|
{
|
|
struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
|
|
struct pci_child_message pkt;
|
|
struct hv_pci_dev *hpdev;
|
|
u32 wslot;
|
|
int ret;
|
|
|
|
for (wslot = 0; wslot < 256; wslot++) {
|
|
hpdev = get_pcichild_wslot(hbus, wslot);
|
|
if (!hpdev)
|
|
continue;
|
|
|
|
memset(&pkt, 0, sizeof(pkt));
|
|
pkt.message_type.type = PCI_RESOURCES_RELEASED;
|
|
pkt.wslot.slot = hpdev->desc.win_slot.slot;
|
|
|
|
put_pcichild(hpdev);
|
|
|
|
ret = vmbus_sendpacket(hdev->channel, &pkt, sizeof(pkt), 0,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void get_hvpcibus(struct hv_pcibus_device *hbus)
|
|
{
|
|
refcount_inc(&hbus->remove_lock);
|
|
}
|
|
|
|
static void put_hvpcibus(struct hv_pcibus_device *hbus)
|
|
{
|
|
if (refcount_dec_and_test(&hbus->remove_lock))
|
|
complete(&hbus->remove_event);
|
|
}
|
|
|
|
/**
|
|
* hv_pci_probe() - New VMBus channel probe, for a root PCI bus
|
|
* @hdev: VMBus's tracking struct for this root PCI bus
|
|
* @dev_id: Identifies the device itself
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int hv_pci_probe(struct hv_device *hdev,
|
|
const struct hv_vmbus_device_id *dev_id)
|
|
{
|
|
struct hv_pcibus_device *hbus;
|
|
int ret;
|
|
|
|
/*
|
|
* hv_pcibus_device contains the hypercall arguments for retargeting in
|
|
* hv_irq_unmask(). Those must not cross a page boundary.
|
|
*/
|
|
BUILD_BUG_ON(sizeof(*hbus) > PAGE_SIZE);
|
|
|
|
hbus = (struct hv_pcibus_device *)get_zeroed_page(GFP_KERNEL);
|
|
if (!hbus)
|
|
return -ENOMEM;
|
|
hbus->state = hv_pcibus_init;
|
|
|
|
/*
|
|
* The PCI bus "domain" is what is called "segment" in ACPI and
|
|
* other specs. Pull it from the instance ID, to get something
|
|
* unique. Bytes 8 and 9 are what is used in Windows guests, so
|
|
* do the same thing for consistency. Note that, since this code
|
|
* only runs in a Hyper-V VM, Hyper-V can (and does) guarantee
|
|
* that (1) the only domain in use for something that looks like
|
|
* a physical PCI bus (which is actually emulated by the
|
|
* hypervisor) is domain 0 and (2) there will be no overlap
|
|
* between domains derived from these instance IDs in the same
|
|
* VM.
|
|
*/
|
|
hbus->sysdata.domain = hdev->dev_instance.b[9] |
|
|
hdev->dev_instance.b[8] << 8;
|
|
|
|
hbus->hdev = hdev;
|
|
refcount_set(&hbus->remove_lock, 1);
|
|
INIT_LIST_HEAD(&hbus->children);
|
|
INIT_LIST_HEAD(&hbus->dr_list);
|
|
INIT_LIST_HEAD(&hbus->resources_for_children);
|
|
spin_lock_init(&hbus->config_lock);
|
|
spin_lock_init(&hbus->device_list_lock);
|
|
spin_lock_init(&hbus->retarget_msi_interrupt_lock);
|
|
init_completion(&hbus->remove_event);
|
|
hbus->wq = alloc_ordered_workqueue("hv_pci_%x", 0,
|
|
hbus->sysdata.domain);
|
|
if (!hbus->wq) {
|
|
ret = -ENOMEM;
|
|
goto free_bus;
|
|
}
|
|
|
|
ret = vmbus_open(hdev->channel, pci_ring_size, pci_ring_size, NULL, 0,
|
|
hv_pci_onchannelcallback, hbus);
|
|
if (ret)
|
|
goto destroy_wq;
|
|
|
|
hv_set_drvdata(hdev, hbus);
|
|
|
|
ret = hv_pci_protocol_negotiation(hdev);
|
|
if (ret)
|
|
goto close;
|
|
|
|
ret = hv_allocate_config_window(hbus);
|
|
if (ret)
|
|
goto close;
|
|
|
|
hbus->cfg_addr = ioremap(hbus->mem_config->start,
|
|
PCI_CONFIG_MMIO_LENGTH);
|
|
if (!hbus->cfg_addr) {
|
|
dev_err(&hdev->device,
|
|
"Unable to map a virtual address for config space\n");
|
|
ret = -ENOMEM;
|
|
goto free_config;
|
|
}
|
|
|
|
hbus->sysdata.fwnode = irq_domain_alloc_fwnode(hbus);
|
|
if (!hbus->sysdata.fwnode) {
|
|
ret = -ENOMEM;
|
|
goto unmap;
|
|
}
|
|
|
|
ret = hv_pcie_init_irq_domain(hbus);
|
|
if (ret)
|
|
goto free_fwnode;
|
|
|
|
ret = hv_pci_query_relations(hdev);
|
|
if (ret)
|
|
goto free_irq_domain;
|
|
|
|
ret = hv_pci_enter_d0(hdev);
|
|
if (ret)
|
|
goto free_irq_domain;
|
|
|
|
ret = hv_pci_allocate_bridge_windows(hbus);
|
|
if (ret)
|
|
goto free_irq_domain;
|
|
|
|
ret = hv_send_resources_allocated(hdev);
|
|
if (ret)
|
|
goto free_windows;
|
|
|
|
prepopulate_bars(hbus);
|
|
|
|
hbus->state = hv_pcibus_probed;
|
|
|
|
ret = create_root_hv_pci_bus(hbus);
|
|
if (ret)
|
|
goto free_windows;
|
|
|
|
return 0;
|
|
|
|
free_windows:
|
|
hv_pci_free_bridge_windows(hbus);
|
|
free_irq_domain:
|
|
irq_domain_remove(hbus->irq_domain);
|
|
free_fwnode:
|
|
irq_domain_free_fwnode(hbus->sysdata.fwnode);
|
|
unmap:
|
|
iounmap(hbus->cfg_addr);
|
|
free_config:
|
|
hv_free_config_window(hbus);
|
|
close:
|
|
vmbus_close(hdev->channel);
|
|
destroy_wq:
|
|
destroy_workqueue(hbus->wq);
|
|
free_bus:
|
|
free_page((unsigned long)hbus);
|
|
return ret;
|
|
}
|
|
|
|
static void hv_pci_bus_exit(struct hv_device *hdev)
|
|
{
|
|
struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
|
|
struct {
|
|
struct pci_packet teardown_packet;
|
|
u8 buffer[sizeof(struct pci_message)];
|
|
} pkt;
|
|
struct pci_bus_relations relations;
|
|
struct hv_pci_compl comp_pkt;
|
|
int ret;
|
|
|
|
/*
|
|
* After the host sends the RESCIND_CHANNEL message, it doesn't
|
|
* access the per-channel ringbuffer any longer.
|
|
*/
|
|
if (hdev->channel->rescind)
|
|
return;
|
|
|
|
/* Delete any children which might still exist. */
|
|
memset(&relations, 0, sizeof(relations));
|
|
hv_pci_devices_present(hbus, &relations);
|
|
|
|
ret = hv_send_resources_released(hdev);
|
|
if (ret)
|
|
dev_err(&hdev->device,
|
|
"Couldn't send resources released packet(s)\n");
|
|
|
|
memset(&pkt.teardown_packet, 0, sizeof(pkt.teardown_packet));
|
|
init_completion(&comp_pkt.host_event);
|
|
pkt.teardown_packet.completion_func = hv_pci_generic_compl;
|
|
pkt.teardown_packet.compl_ctxt = &comp_pkt;
|
|
pkt.teardown_packet.message[0].type = PCI_BUS_D0EXIT;
|
|
|
|
ret = vmbus_sendpacket(hdev->channel, &pkt.teardown_packet.message,
|
|
sizeof(struct pci_message),
|
|
(unsigned long)&pkt.teardown_packet,
|
|
VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
if (!ret)
|
|
wait_for_completion_timeout(&comp_pkt.host_event, 10 * HZ);
|
|
}
|
|
|
|
/**
|
|
* hv_pci_remove() - Remove routine for this VMBus channel
|
|
* @hdev: VMBus's tracking struct for this root PCI bus
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
static int hv_pci_remove(struct hv_device *hdev)
|
|
{
|
|
struct hv_pcibus_device *hbus;
|
|
|
|
hbus = hv_get_drvdata(hdev);
|
|
if (hbus->state == hv_pcibus_installed) {
|
|
/* Remove the bus from PCI's point of view. */
|
|
pci_lock_rescan_remove();
|
|
pci_stop_root_bus(hbus->pci_bus);
|
|
hv_pci_remove_slots(hbus);
|
|
pci_remove_root_bus(hbus->pci_bus);
|
|
pci_unlock_rescan_remove();
|
|
hbus->state = hv_pcibus_removed;
|
|
}
|
|
|
|
hv_pci_bus_exit(hdev);
|
|
|
|
vmbus_close(hdev->channel);
|
|
|
|
iounmap(hbus->cfg_addr);
|
|
hv_free_config_window(hbus);
|
|
pci_free_resource_list(&hbus->resources_for_children);
|
|
hv_pci_free_bridge_windows(hbus);
|
|
irq_domain_remove(hbus->irq_domain);
|
|
irq_domain_free_fwnode(hbus->sysdata.fwnode);
|
|
put_hvpcibus(hbus);
|
|
wait_for_completion(&hbus->remove_event);
|
|
destroy_workqueue(hbus->wq);
|
|
free_page((unsigned long)hbus);
|
|
return 0;
|
|
}
|
|
|
|
static const struct hv_vmbus_device_id hv_pci_id_table[] = {
|
|
/* PCI Pass-through Class ID */
|
|
/* 44C4F61D-4444-4400-9D52-802E27EDE19F */
|
|
{ HV_PCIE_GUID, },
|
|
{ },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(vmbus, hv_pci_id_table);
|
|
|
|
static struct hv_driver hv_pci_drv = {
|
|
.name = "hv_pci",
|
|
.id_table = hv_pci_id_table,
|
|
.probe = hv_pci_probe,
|
|
.remove = hv_pci_remove,
|
|
};
|
|
|
|
static void __exit exit_hv_pci_drv(void)
|
|
{
|
|
vmbus_driver_unregister(&hv_pci_drv);
|
|
}
|
|
|
|
static int __init init_hv_pci_drv(void)
|
|
{
|
|
return vmbus_driver_register(&hv_pci_drv);
|
|
}
|
|
|
|
module_init(init_hv_pci_drv);
|
|
module_exit(exit_hv_pci_drv);
|
|
|
|
MODULE_DESCRIPTION("Hyper-V PCI");
|
|
MODULE_LICENSE("GPL v2");
|