586 lines
19 KiB
C
Executable file
586 lines
19 KiB
C
Executable file
#ifndef __CARD_BASE_H__
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#define __CARD_BASE_H__
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/**
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* IBM Accelerator Family 'GenWQE'
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*
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* (C) Copyright IBM Corp. 2013
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*
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* Author: Frank Haverkamp <haver@linux.vnet.ibm.com>
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* Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
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* Author: Michael Jung <mijung@gmx.net>
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* Author: Michael Ruettger <michael@ibmra.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/*
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* Interfaces within the GenWQE module. Defines genwqe_card and
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* ddcb_queue as well as ddcb_requ.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/cdev.h>
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#include <linux/stringify.h>
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#include <linux/pci.h>
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#include <linux/semaphore.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/debugfs.h>
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#include <linux/slab.h>
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#include <linux/genwqe/genwqe_card.h>
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#include "genwqe_driver.h"
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#define GENWQE_MSI_IRQS 4 /* Just one supported, no MSIx */
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#define GENWQE_MAX_VFS 15 /* maximum 15 VFs are possible */
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#define GENWQE_MAX_FUNCS 16 /* 1 PF and 15 VFs */
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#define GENWQE_CARD_NO_MAX (16 * GENWQE_MAX_FUNCS)
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/* Compile parameters, some of them appear in debugfs for later adjustment */
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#define GENWQE_DDCB_MAX 32 /* DDCBs on the work-queue */
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#define GENWQE_POLLING_ENABLED 0 /* in case of irqs not working */
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#define GENWQE_DDCB_SOFTWARE_TIMEOUT 10 /* timeout per DDCB in seconds */
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#define GENWQE_KILL_TIMEOUT 8 /* time until process gets killed */
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#define GENWQE_VF_JOBTIMEOUT_MSEC 250 /* 250 msec */
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#define GENWQE_PF_JOBTIMEOUT_MSEC 8000 /* 8 sec should be ok */
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#define GENWQE_HEALTH_CHECK_INTERVAL 4 /* <= 0: disabled */
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/* Sysfs attribute groups used when we create the genwqe device */
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extern const struct attribute_group *genwqe_attribute_groups[];
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/*
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* Config space for Genwqe5 A7:
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* 00:[14 10 4b 04]40 00 10 00[00 00 00 12]00 00 00 00
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* 10: 0c 00 00 f0 07 3c 00 00 00 00 00 00 00 00 00 00
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* 20: 00 00 00 00 00 00 00 00 00 00 00 00[14 10 4b 04]
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* 30: 00 00 00 00 50 00 00 00 00 00 00 00 00 00 00 00
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*/
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#define PCI_DEVICE_GENWQE 0x044b /* Genwqe DeviceID */
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#define PCI_SUBSYSTEM_ID_GENWQE5 0x035f /* Genwqe A5 Subsystem-ID */
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#define PCI_SUBSYSTEM_ID_GENWQE5_NEW 0x044b /* Genwqe A5 Subsystem-ID */
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#define PCI_CLASSCODE_GENWQE5 0x1200 /* UNKNOWN */
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#define PCI_SUBVENDOR_ID_IBM_SRIOV 0x0000
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#define PCI_SUBSYSTEM_ID_GENWQE5_SRIOV 0x0000 /* Genwqe A5 Subsystem-ID */
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#define PCI_CLASSCODE_GENWQE5_SRIOV 0x1200 /* UNKNOWN */
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#define GENWQE_SLU_ARCH_REQ 2 /* Required SLU architecture level */
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/**
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* struct genwqe_reg - Genwqe data dump functionality
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*/
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struct genwqe_reg {
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u32 addr;
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u32 idx;
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u64 val;
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};
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/*
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* enum genwqe_dbg_type - Specify chip unit to dump/debug
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*/
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enum genwqe_dbg_type {
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GENWQE_DBG_UNIT0 = 0, /* captured before prev errs cleared */
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GENWQE_DBG_UNIT1 = 1,
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GENWQE_DBG_UNIT2 = 2,
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GENWQE_DBG_UNIT3 = 3,
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GENWQE_DBG_UNIT4 = 4,
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GENWQE_DBG_UNIT5 = 5,
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GENWQE_DBG_UNIT6 = 6,
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GENWQE_DBG_UNIT7 = 7,
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GENWQE_DBG_REGS = 8,
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GENWQE_DBG_DMA = 9,
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GENWQE_DBG_UNITS = 10, /* max number of possible debug units */
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};
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/* Software error injection to simulate card failures */
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#define GENWQE_INJECT_HARDWARE_FAILURE 0x00000001 /* injects -1 reg reads */
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#define GENWQE_INJECT_BUS_RESET_FAILURE 0x00000002 /* pci_bus_reset fail */
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#define GENWQE_INJECT_GFIR_FATAL 0x00000004 /* GFIR = 0x0000ffff */
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#define GENWQE_INJECT_GFIR_INFO 0x00000008 /* GFIR = 0xffff0000 */
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/*
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* Genwqe card description and management data.
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*
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* Error-handling in case of card malfunction
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* ------------------------------------------
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*
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* If the card is detected to be defective the outside environment
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* will cause the PCI layer to call deinit (the cleanup function for
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* probe). This is the same effect like doing a unbind/bind operation
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* on the card.
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*
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* The genwqe card driver implements a health checking thread which
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* verifies the card function. If this detects a problem the cards
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* device is being shutdown and restarted again, along with a reset of
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* the card and queue.
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*
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* All functions accessing the card device return either -EIO or -ENODEV
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* code to indicate the malfunction to the user. The user has to close
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* the file descriptor and open a new one, once the card becomes
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* available again.
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*
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* If the open file descriptor is setup to receive SIGIO, the signal is
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* genereated for the application which has to provide a handler to
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* react on it. If the application does not close the open
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* file descriptor a SIGKILL is send to enforce freeing the cards
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* resources.
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*
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* I did not find a different way to prevent kernel problems due to
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* reference counters for the cards character devices getting out of
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* sync. The character device deallocation does not block, even if
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* there is still an open file descriptor pending. If this pending
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* descriptor is closed, the data structures used by the character
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* device is reinstantiated, which will lead to the reference counter
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* dropping below the allowed values.
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*
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* Card recovery
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* -------------
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*
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* To test the internal driver recovery the following command can be used:
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* sudo sh -c 'echo 0xfffff > /sys/class/genwqe/genwqe0_card/err_inject'
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*/
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/**
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* struct dma_mapping_type - Mapping type definition
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*
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* To avoid memcpying data arround we use user memory directly. To do
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* this we need to pin/swap-in the memory and request a DMA address
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* for it.
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*/
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enum dma_mapping_type {
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GENWQE_MAPPING_RAW = 0, /* contignous memory buffer */
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GENWQE_MAPPING_SGL_TEMP, /* sglist dynamically used */
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GENWQE_MAPPING_SGL_PINNED, /* sglist used with pinning */
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};
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/**
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* struct dma_mapping - Information about memory mappings done by the driver
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*/
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struct dma_mapping {
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enum dma_mapping_type type;
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void *u_vaddr; /* user-space vaddr/non-aligned */
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void *k_vaddr; /* kernel-space vaddr/non-aligned */
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dma_addr_t dma_addr; /* physical DMA address */
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struct page **page_list; /* list of pages used by user buff */
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dma_addr_t *dma_list; /* list of dma addresses per page */
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unsigned int nr_pages; /* number of pages */
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unsigned int size; /* size in bytes */
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struct list_head card_list; /* list of usr_maps for card */
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struct list_head pin_list; /* list of pinned memory for dev */
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int write; /* writable map? useful in unmapping */
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};
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static inline void genwqe_mapping_init(struct dma_mapping *m,
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enum dma_mapping_type type)
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{
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memset(m, 0, sizeof(*m));
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m->type = type;
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m->write = 1; /* Assume the maps we create are R/W */
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}
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/**
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* struct ddcb_queue - DDCB queue data
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* @ddcb_max: Number of DDCBs on the queue
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* @ddcb_next: Next free DDCB
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* @ddcb_act: Next DDCB supposed to finish
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* @ddcb_seq: Sequence number of last DDCB
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* @ddcbs_in_flight: Currently enqueued DDCBs
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* @ddcbs_completed: Number of already completed DDCBs
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* @return_on_busy: Number of -EBUSY returns on full queue
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* @wait_on_busy: Number of waits on full queue
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* @ddcb_daddr: DMA address of first DDCB in the queue
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* @ddcb_vaddr: Kernel virtual address of first DDCB in the queue
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* @ddcb_req: Associated requests (one per DDCB)
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* @ddcb_waitqs: Associated wait queues (one per DDCB)
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* @ddcb_lock: Lock to protect queuing operations
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* @ddcb_waitq: Wait on next DDCB finishing
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*/
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struct ddcb_queue {
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int ddcb_max; /* amount of DDCBs */
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int ddcb_next; /* next available DDCB num */
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int ddcb_act; /* DDCB to be processed */
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u16 ddcb_seq; /* slc seq num */
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unsigned int ddcbs_in_flight; /* number of ddcbs in processing */
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unsigned int ddcbs_completed;
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unsigned int ddcbs_max_in_flight;
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unsigned int return_on_busy; /* how many times -EBUSY? */
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unsigned int wait_on_busy;
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dma_addr_t ddcb_daddr; /* DMA address */
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struct ddcb *ddcb_vaddr; /* kernel virtual addr for DDCBs */
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struct ddcb_requ **ddcb_req; /* ddcb processing parameter */
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wait_queue_head_t *ddcb_waitqs; /* waitqueue per ddcb */
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spinlock_t ddcb_lock; /* exclusive access to queue */
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wait_queue_head_t busy_waitq; /* wait for ddcb processing */
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/* registers or the respective queue to be used */
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u32 IO_QUEUE_CONFIG;
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u32 IO_QUEUE_STATUS;
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u32 IO_QUEUE_SEGMENT;
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u32 IO_QUEUE_INITSQN;
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u32 IO_QUEUE_WRAP;
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u32 IO_QUEUE_OFFSET;
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u32 IO_QUEUE_WTIME;
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u32 IO_QUEUE_ERRCNTS;
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u32 IO_QUEUE_LRW;
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};
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/*
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* GFIR, SLU_UNITCFG, APP_UNITCFG
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* 8 Units with FIR/FEC + 64 * 2ndary FIRS/FEC.
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*/
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#define GENWQE_FFDC_REGS (3 + (8 * (2 + 2 * 64)))
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struct genwqe_ffdc {
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unsigned int entries;
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struct genwqe_reg *regs;
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};
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/**
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* struct genwqe_dev - GenWQE device information
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* @card_state: Card operation state, see above
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* @ffdc: First Failure Data Capture buffers for each unit
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* @card_thread: Working thread to operate the DDCB queue
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* @card_waitq: Wait queue used in card_thread
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* @queue: DDCB queue
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* @health_thread: Card monitoring thread (only for PFs)
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* @health_waitq: Wait queue used in health_thread
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* @pci_dev: Associated PCI device (function)
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* @mmio: Base address of 64-bit register space
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* @mmio_len: Length of register area
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* @file_lock: Lock to protect access to file_list
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* @file_list: List of all processes with open GenWQE file descriptors
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*
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* This struct contains all information needed to communicate with a
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* GenWQE card. It is initialized when a GenWQE device is found and
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* destroyed when it goes away. It holds data to maintain the queue as
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* well as data needed to feed the user interfaces.
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*/
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struct genwqe_dev {
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enum genwqe_card_state card_state;
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spinlock_t print_lock;
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int card_idx; /* card index 0..CARD_NO_MAX-1 */
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u64 flags; /* general flags */
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/* FFDC data gathering */
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struct genwqe_ffdc ffdc[GENWQE_DBG_UNITS];
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/* DDCB workqueue */
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struct task_struct *card_thread;
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wait_queue_head_t queue_waitq;
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struct ddcb_queue queue; /* genwqe DDCB queue */
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unsigned int irqs_processed;
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/* Card health checking thread */
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struct task_struct *health_thread;
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wait_queue_head_t health_waitq;
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int use_platform_recovery; /* use platform recovery mechanisms */
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/* char device */
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dev_t devnum_genwqe; /* major/minor num card */
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struct class *class_genwqe; /* reference to class object */
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struct device *dev; /* for device creation */
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struct cdev cdev_genwqe; /* char device for card */
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struct dentry *debugfs_root; /* debugfs card root directory */
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struct dentry *debugfs_genwqe; /* debugfs driver root directory */
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/* pci resources */
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struct pci_dev *pci_dev; /* PCI device */
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void __iomem *mmio; /* BAR-0 MMIO start */
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unsigned long mmio_len;
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int num_vfs;
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u32 vf_jobtimeout_msec[GENWQE_MAX_VFS];
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int is_privileged; /* access to all regs possible */
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/* config regs which we need often */
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u64 slu_unitcfg;
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u64 app_unitcfg;
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u64 softreset;
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u64 err_inject;
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u64 last_gfir;
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char app_name[5];
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spinlock_t file_lock; /* lock for open files */
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struct list_head file_list; /* list of open files */
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/* debugfs parameters */
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int ddcb_software_timeout; /* wait until DDCB times out */
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int skip_recovery; /* circumvention if recovery fails */
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int kill_timeout; /* wait after sending SIGKILL */
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};
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/**
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* enum genwqe_requ_state - State of a DDCB execution request
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*/
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enum genwqe_requ_state {
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GENWQE_REQU_NEW = 0,
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GENWQE_REQU_ENQUEUED = 1,
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GENWQE_REQU_TAPPED = 2,
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GENWQE_REQU_FINISHED = 3,
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GENWQE_REQU_STATE_MAX,
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};
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/**
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* struct genwqe_sgl - Scatter gather list describing user-space memory
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* @sgl: scatter gather list needs to be 128 byte aligned
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* @sgl_dma_addr: dma address of sgl
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* @sgl_size: size of area used for sgl
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* @user_addr: user-space address of memory area
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* @user_size: size of user-space memory area
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* @page: buffer for partial pages if needed
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* @page_dma_addr: dma address partial pages
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* @write: should we write it back to userspace?
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*/
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struct genwqe_sgl {
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dma_addr_t sgl_dma_addr;
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struct sg_entry *sgl;
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size_t sgl_size; /* size of sgl */
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void __user *user_addr; /* user-space base-address */
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size_t user_size; /* size of memory area */
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int write;
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unsigned long nr_pages;
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unsigned long fpage_offs;
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size_t fpage_size;
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size_t lpage_size;
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void *fpage;
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dma_addr_t fpage_dma_addr;
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void *lpage;
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dma_addr_t lpage_dma_addr;
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};
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int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,
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void __user *user_addr, size_t user_size, int write);
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int genwqe_setup_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,
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dma_addr_t *dma_list);
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int genwqe_free_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl);
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/**
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* struct ddcb_requ - Kernel internal representation of the DDCB request
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* @cmd: User space representation of the DDCB execution request
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*/
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struct ddcb_requ {
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/* kernel specific content */
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enum genwqe_requ_state req_state; /* request status */
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int num; /* ddcb_no for this request */
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struct ddcb_queue *queue; /* associated queue */
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struct dma_mapping dma_mappings[DDCB_FIXUPS];
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struct genwqe_sgl sgls[DDCB_FIXUPS];
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/* kernel/user shared content */
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struct genwqe_ddcb_cmd cmd; /* ddcb_no for this request */
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struct genwqe_debug_data debug_data;
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};
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/**
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* struct genwqe_file - Information for open GenWQE devices
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*/
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struct genwqe_file {
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struct genwqe_dev *cd;
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struct genwqe_driver *client;
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struct file *filp;
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struct fasync_struct *async_queue;
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struct pid *opener;
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struct list_head list; /* entry in list of open files */
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spinlock_t map_lock; /* lock for dma_mappings */
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struct list_head map_list; /* list of dma_mappings */
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spinlock_t pin_lock; /* lock for pinned memory */
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struct list_head pin_list; /* list of pinned memory */
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};
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int genwqe_setup_service_layer(struct genwqe_dev *cd); /* for PF only */
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int genwqe_finish_queue(struct genwqe_dev *cd);
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int genwqe_release_service_layer(struct genwqe_dev *cd);
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/**
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* genwqe_get_slu_id() - Read Service Layer Unit Id
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* Return: 0x00: Development code
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* 0x01: SLC1 (old)
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* 0x02: SLC2 (sept2012)
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* 0x03: SLC2 (feb2013, generic driver)
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*/
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static inline int genwqe_get_slu_id(struct genwqe_dev *cd)
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{
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return (int)((cd->slu_unitcfg >> 32) & 0xff);
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}
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int genwqe_ddcbs_in_flight(struct genwqe_dev *cd);
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u8 genwqe_card_type(struct genwqe_dev *cd);
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int genwqe_card_reset(struct genwqe_dev *cd);
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int genwqe_set_interrupt_capability(struct genwqe_dev *cd, int count);
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void genwqe_reset_interrupt_capability(struct genwqe_dev *cd);
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int genwqe_device_create(struct genwqe_dev *cd);
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int genwqe_device_remove(struct genwqe_dev *cd);
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/* debugfs */
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int genwqe_init_debugfs(struct genwqe_dev *cd);
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void genqwe_exit_debugfs(struct genwqe_dev *cd);
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int genwqe_read_softreset(struct genwqe_dev *cd);
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/* Hardware Circumventions */
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int genwqe_recovery_on_fatal_gfir_required(struct genwqe_dev *cd);
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int genwqe_flash_readback_fails(struct genwqe_dev *cd);
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/**
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* genwqe_write_vreg() - Write register in VF window
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* @cd: genwqe device
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* @reg: register address
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* @val: value to write
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* @func: 0: PF, 1: VF0, ..., 15: VF14
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*/
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int genwqe_write_vreg(struct genwqe_dev *cd, u32 reg, u64 val, int func);
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/**
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* genwqe_read_vreg() - Read register in VF window
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* @cd: genwqe device
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* @reg: register address
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* @func: 0: PF, 1: VF0, ..., 15: VF14
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*
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* Return: content of the register
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*/
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u64 genwqe_read_vreg(struct genwqe_dev *cd, u32 reg, int func);
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/* FFDC Buffer Management */
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int genwqe_ffdc_buff_size(struct genwqe_dev *cd, int unit_id);
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int genwqe_ffdc_buff_read(struct genwqe_dev *cd, int unit_id,
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struct genwqe_reg *regs, unsigned int max_regs);
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int genwqe_read_ffdc_regs(struct genwqe_dev *cd, struct genwqe_reg *regs,
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unsigned int max_regs, int all);
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int genwqe_ffdc_dump_dma(struct genwqe_dev *cd,
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struct genwqe_reg *regs, unsigned int max_regs);
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int genwqe_init_debug_data(struct genwqe_dev *cd,
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struct genwqe_debug_data *d);
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void genwqe_init_crc32(void);
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int genwqe_read_app_id(struct genwqe_dev *cd, char *app_name, int len);
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/* Memory allocation/deallocation; dma address handling */
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int genwqe_user_vmap(struct genwqe_dev *cd, struct dma_mapping *m,
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void *uaddr, unsigned long size);
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int genwqe_user_vunmap(struct genwqe_dev *cd, struct dma_mapping *m);
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static inline bool dma_mapping_used(struct dma_mapping *m)
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{
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if (!m)
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return false;
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return m->size != 0;
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}
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/**
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* __genwqe_execute_ddcb() - Execute DDCB request with addr translation
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*
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* This function will do the address translation changes to the DDCBs
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* according to the definitions required by the ATS field. It looks up
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* the memory allocation buffer or does vmap/vunmap for the respective
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* user-space buffers, inclusive page pinning and scatter gather list
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* buildup and teardown.
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*/
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int __genwqe_execute_ddcb(struct genwqe_dev *cd,
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struct genwqe_ddcb_cmd *cmd, unsigned int f_flags);
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/**
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* __genwqe_execute_raw_ddcb() - Execute DDCB request without addr translation
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*
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* This version will not do address translation or any modification of
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* the DDCB data. It is used e.g. for the MoveFlash DDCB which is
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* entirely prepared by the driver itself. That means the appropriate
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* DMA addresses are already in the DDCB and do not need any
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* modification.
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*/
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int __genwqe_execute_raw_ddcb(struct genwqe_dev *cd,
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struct genwqe_ddcb_cmd *cmd,
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unsigned int f_flags);
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int __genwqe_enqueue_ddcb(struct genwqe_dev *cd,
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struct ddcb_requ *req,
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unsigned int f_flags);
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int __genwqe_wait_ddcb(struct genwqe_dev *cd, struct ddcb_requ *req);
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int __genwqe_purge_ddcb(struct genwqe_dev *cd, struct ddcb_requ *req);
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/* register access */
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int __genwqe_writeq(struct genwqe_dev *cd, u64 byte_offs, u64 val);
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u64 __genwqe_readq(struct genwqe_dev *cd, u64 byte_offs);
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int __genwqe_writel(struct genwqe_dev *cd, u64 byte_offs, u32 val);
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u32 __genwqe_readl(struct genwqe_dev *cd, u64 byte_offs);
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void *__genwqe_alloc_consistent(struct genwqe_dev *cd, size_t size,
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dma_addr_t *dma_handle);
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void __genwqe_free_consistent(struct genwqe_dev *cd, size_t size,
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void *vaddr, dma_addr_t dma_handle);
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/* Base clock frequency in MHz */
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int genwqe_base_clock_frequency(struct genwqe_dev *cd);
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/* Before FFDC is captured the traps should be stopped. */
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void genwqe_stop_traps(struct genwqe_dev *cd);
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void genwqe_start_traps(struct genwqe_dev *cd);
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/* Hardware circumvention */
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bool genwqe_need_err_masking(struct genwqe_dev *cd);
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/**
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* genwqe_is_privileged() - Determine operation mode for PCI function
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*
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* On Intel with SRIOV support we see:
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* PF: is_physfn = 1 is_virtfn = 0
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* VF: is_physfn = 0 is_virtfn = 1
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*
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* On Systems with no SRIOV support _and_ virtualized systems we get:
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* is_physfn = 0 is_virtfn = 0
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*
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* Other vendors have individual pci device ids to distinguish between
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* virtual function drivers and physical function drivers. GenWQE
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* unfortunately has just on pci device id for both, VFs and PF.
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*
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* The following code is used to distinguish if the card is running in
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* privileged mode, either as true PF or in a virtualized system with
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* full register access e.g. currently on PowerPC.
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*
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* if (pci_dev->is_virtfn)
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* cd->is_privileged = 0;
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* else
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* cd->is_privileged = (__genwqe_readq(cd, IO_SLU_BITSTREAM)
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* != IO_ILLEGAL_VALUE);
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*/
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static inline int genwqe_is_privileged(struct genwqe_dev *cd)
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{
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return cd->is_privileged;
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}
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#endif /* __CARD_BASE_H__ */
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