440 lines
12 KiB
C
440 lines
12 KiB
C
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/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2013 Intel Corporation.
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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, as
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* 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Intel MIC Host driver.
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*
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*/
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#include <linux/pci.h>
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#include "../common/mic_dev.h"
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#include "mic_device.h"
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#include "mic_smpt.h"
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static inline u64 mic_system_page_mask(struct mic_device *mdev)
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{
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return (1ULL << mdev->smpt->info.page_shift) - 1ULL;
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}
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static inline u8 mic_sys_addr_to_smpt(struct mic_device *mdev, dma_addr_t pa)
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{
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return (pa - mdev->smpt->info.base) >> mdev->smpt->info.page_shift;
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}
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static inline u64 mic_smpt_to_pa(struct mic_device *mdev, u8 index)
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{
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return mdev->smpt->info.base + (index * mdev->smpt->info.page_size);
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}
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static inline u64 mic_smpt_offset(struct mic_device *mdev, dma_addr_t pa)
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{
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return pa & mic_system_page_mask(mdev);
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}
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static inline u64 mic_smpt_align_low(struct mic_device *mdev, dma_addr_t pa)
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{
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return ALIGN(pa - mic_system_page_mask(mdev),
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mdev->smpt->info.page_size);
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}
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static inline u64 mic_smpt_align_high(struct mic_device *mdev, dma_addr_t pa)
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{
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return ALIGN(pa, mdev->smpt->info.page_size);
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}
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/* Total Cumulative system memory accessible by MIC across all SMPT entries */
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static inline u64 mic_max_system_memory(struct mic_device *mdev)
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{
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return mdev->smpt->info.num_reg * mdev->smpt->info.page_size;
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}
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/* Maximum system memory address accessible by MIC */
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static inline u64 mic_max_system_addr(struct mic_device *mdev)
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{
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return mdev->smpt->info.base + mic_max_system_memory(mdev) - 1ULL;
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}
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/* Check if the DMA address is a MIC system memory address */
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static inline bool
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mic_is_system_addr(struct mic_device *mdev, dma_addr_t pa)
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{
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return pa >= mdev->smpt->info.base && pa <= mic_max_system_addr(mdev);
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}
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/* Populate an SMPT entry and update the reference counts. */
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static void mic_add_smpt_entry(int spt, s64 *ref, u64 addr,
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int entries, struct mic_device *mdev)
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{
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struct mic_smpt_info *smpt_info = mdev->smpt;
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int i;
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for (i = spt; i < spt + entries; i++,
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addr += smpt_info->info.page_size) {
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if (!smpt_info->entry[i].ref_count &&
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(smpt_info->entry[i].dma_addr != addr)) {
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mdev->smpt_ops->set(mdev, addr, i);
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smpt_info->entry[i].dma_addr = addr;
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}
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smpt_info->entry[i].ref_count += ref[i - spt];
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}
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}
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/*
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* Find an available MIC address in MIC SMPT address space
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* for a given DMA address and size.
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*/
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static dma_addr_t mic_smpt_op(struct mic_device *mdev, u64 dma_addr,
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int entries, s64 *ref, size_t size)
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{
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int spt;
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int ae = 0;
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int i;
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unsigned long flags;
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dma_addr_t mic_addr = 0;
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dma_addr_t addr = dma_addr;
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struct mic_smpt_info *smpt_info = mdev->smpt;
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spin_lock_irqsave(&smpt_info->smpt_lock, flags);
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/* find existing entries */
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for (i = 0; i < smpt_info->info.num_reg; i++) {
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if (smpt_info->entry[i].dma_addr == addr) {
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ae++;
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addr += smpt_info->info.page_size;
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} else if (ae) /* cannot find contiguous entries */
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goto not_found;
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if (ae == entries)
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goto found;
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}
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/* find free entry */
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for (ae = 0, i = 0; i < smpt_info->info.num_reg; i++) {
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ae = (smpt_info->entry[i].ref_count == 0) ? ae + 1 : 0;
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if (ae == entries)
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goto found;
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}
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not_found:
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spin_unlock_irqrestore(&smpt_info->smpt_lock, flags);
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return mic_addr;
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found:
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spt = i - entries + 1;
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mic_addr = mic_smpt_to_pa(mdev, spt);
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mic_add_smpt_entry(spt, ref, dma_addr, entries, mdev);
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smpt_info->map_count++;
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smpt_info->ref_count += (s64)size;
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spin_unlock_irqrestore(&smpt_info->smpt_lock, flags);
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return mic_addr;
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}
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/*
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* Returns number of smpt entries needed for dma_addr to dma_addr + size
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* also returns the reference count array for each of those entries
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* and the starting smpt address
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*/
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static int mic_get_smpt_ref_count(struct mic_device *mdev, dma_addr_t dma_addr,
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size_t size, s64 *ref, u64 *smpt_start)
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{
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u64 start = dma_addr;
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u64 end = dma_addr + size;
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int i = 0;
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while (start < end) {
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ref[i++] = min(mic_smpt_align_high(mdev, start + 1),
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end) - start;
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start = mic_smpt_align_high(mdev, start + 1);
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}
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if (smpt_start)
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*smpt_start = mic_smpt_align_low(mdev, dma_addr);
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return i;
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}
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/*
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* mic_to_dma_addr - Converts a MIC address to a DMA address.
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*
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* @mdev: pointer to mic_device instance.
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* @mic_addr: MIC address.
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*
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* returns a DMA address.
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*/
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dma_addr_t mic_to_dma_addr(struct mic_device *mdev, dma_addr_t mic_addr)
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{
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struct mic_smpt_info *smpt_info = mdev->smpt;
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int spt;
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dma_addr_t dma_addr;
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if (!mic_is_system_addr(mdev, mic_addr)) {
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dev_err(&mdev->pdev->dev,
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"mic_addr is invalid. mic_addr = 0x%llx\n", mic_addr);
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return -EINVAL;
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}
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spt = mic_sys_addr_to_smpt(mdev, mic_addr);
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dma_addr = smpt_info->entry[spt].dma_addr +
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mic_smpt_offset(mdev, mic_addr);
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return dma_addr;
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}
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/**
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* mic_map - Maps a DMA address to a MIC physical address.
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*
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* @mdev: pointer to mic_device instance.
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* @dma_addr: DMA address.
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* @size: Size of the region to be mapped.
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*
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* This API converts the DMA address provided to a DMA address understood
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* by MIC. Caller should check for errors by calling mic_map_error(..).
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*
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* returns DMA address as required by MIC.
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*/
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dma_addr_t mic_map(struct mic_device *mdev, dma_addr_t dma_addr, size_t size)
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{
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dma_addr_t mic_addr = 0;
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int num_entries;
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s64 *ref;
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u64 smpt_start;
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if (!size || size > mic_max_system_memory(mdev))
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return mic_addr;
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ref = kmalloc_array(mdev->smpt->info.num_reg, sizeof(s64), GFP_ATOMIC);
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if (!ref)
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return mic_addr;
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num_entries = mic_get_smpt_ref_count(mdev, dma_addr, size,
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ref, &smpt_start);
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/* Set the smpt table appropriately and get 16G aligned mic address */
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mic_addr = mic_smpt_op(mdev, smpt_start, num_entries, ref, size);
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kfree(ref);
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/*
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* If mic_addr is zero then its an error case
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* since mic_addr can never be zero.
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* else generate mic_addr by adding the 16G offset in dma_addr
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*/
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if (!mic_addr && MIC_FAMILY_X100 == mdev->family) {
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dev_err(&mdev->pdev->dev,
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"mic_map failed dma_addr 0x%llx size 0x%lx\n",
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dma_addr, size);
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return mic_addr;
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} else {
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return mic_addr + mic_smpt_offset(mdev, dma_addr);
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}
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}
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/**
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* mic_unmap - Unmaps a MIC physical address.
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*
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* @mdev: pointer to mic_device instance.
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* @mic_addr: MIC physical address.
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* @size: Size of the region to be unmapped.
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*
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* This API unmaps the mappings created by mic_map(..).
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*
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* returns None.
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*/
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void mic_unmap(struct mic_device *mdev, dma_addr_t mic_addr, size_t size)
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{
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struct mic_smpt_info *smpt_info = mdev->smpt;
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s64 *ref;
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int num_smpt;
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int spt;
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int i;
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unsigned long flags;
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if (!size)
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return;
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if (!mic_is_system_addr(mdev, mic_addr)) {
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dev_err(&mdev->pdev->dev,
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"invalid address: 0x%llx\n", mic_addr);
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return;
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}
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spt = mic_sys_addr_to_smpt(mdev, mic_addr);
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ref = kmalloc_array(mdev->smpt->info.num_reg, sizeof(s64), GFP_ATOMIC);
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if (!ref)
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return;
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/* Get number of smpt entries to be mapped, ref count array */
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num_smpt = mic_get_smpt_ref_count(mdev, mic_addr, size, ref, NULL);
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spin_lock_irqsave(&smpt_info->smpt_lock, flags);
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smpt_info->unmap_count++;
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smpt_info->ref_count -= (s64)size;
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for (i = spt; i < spt + num_smpt; i++) {
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smpt_info->entry[i].ref_count -= ref[i - spt];
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if (smpt_info->entry[i].ref_count < 0)
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dev_warn(&mdev->pdev->dev,
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"ref count for entry %d is negative\n", i);
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}
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spin_unlock_irqrestore(&smpt_info->smpt_lock, flags);
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kfree(ref);
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}
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/**
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* mic_map_single - Maps a virtual address to a MIC physical address.
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*
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* @mdev: pointer to mic_device instance.
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* @va: Kernel direct mapped virtual address.
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* @size: Size of the region to be mapped.
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*
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* This API calls pci_map_single(..) for the direct mapped virtual address
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* and then converts the DMA address provided to a DMA address understood
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* by MIC. Caller should check for errors by calling mic_map_error(..).
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*
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* returns DMA address as required by MIC.
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*/
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dma_addr_t mic_map_single(struct mic_device *mdev, void *va, size_t size)
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{
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dma_addr_t mic_addr = 0;
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struct pci_dev *pdev = mdev->pdev;
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dma_addr_t dma_addr =
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pci_map_single(pdev, va, size, PCI_DMA_BIDIRECTIONAL);
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if (!pci_dma_mapping_error(pdev, dma_addr)) {
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mic_addr = mic_map(mdev, dma_addr, size);
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if (!mic_addr) {
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dev_err(&mdev->pdev->dev,
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"mic_map failed dma_addr 0x%llx size 0x%lx\n",
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dma_addr, size);
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pci_unmap_single(pdev, dma_addr,
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size, PCI_DMA_BIDIRECTIONAL);
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}
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}
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return mic_addr;
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}
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/**
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* mic_unmap_single - Unmaps a MIC physical address.
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*
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* @mdev: pointer to mic_device instance.
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* @mic_addr: MIC physical address.
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* @size: Size of the region to be unmapped.
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*
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* This API unmaps the mappings created by mic_map_single(..).
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*
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* returns None.
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*/
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void
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mic_unmap_single(struct mic_device *mdev, dma_addr_t mic_addr, size_t size)
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{
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struct pci_dev *pdev = mdev->pdev;
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dma_addr_t dma_addr = mic_to_dma_addr(mdev, mic_addr);
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mic_unmap(mdev, mic_addr, size);
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pci_unmap_single(pdev, dma_addr, size, PCI_DMA_BIDIRECTIONAL);
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}
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/**
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* mic_smpt_init - Initialize MIC System Memory Page Tables.
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*
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* @mdev: pointer to mic_device instance.
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*
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* returns 0 for success and -errno for error.
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*/
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int mic_smpt_init(struct mic_device *mdev)
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{
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int i, err = 0;
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dma_addr_t dma_addr;
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struct mic_smpt_info *smpt_info;
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|
|
mdev->smpt = kmalloc(sizeof(*mdev->smpt), GFP_KERNEL);
|
||
|
|
if (!mdev->smpt)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
smpt_info = mdev->smpt;
|
||
|
|
mdev->smpt_ops->init(mdev);
|
||
|
|
smpt_info->entry = kmalloc_array(smpt_info->info.num_reg,
|
||
|
|
sizeof(*smpt_info->entry), GFP_KERNEL);
|
||
|
|
if (!smpt_info->entry) {
|
||
|
|
err = -ENOMEM;
|
||
|
|
goto free_smpt;
|
||
|
|
}
|
||
|
|
spin_lock_init(&smpt_info->smpt_lock);
|
||
|
|
for (i = 0; i < smpt_info->info.num_reg; i++) {
|
||
|
|
dma_addr = i * smpt_info->info.page_size;
|
||
|
|
smpt_info->entry[i].dma_addr = dma_addr;
|
||
|
|
smpt_info->entry[i].ref_count = 0;
|
||
|
|
mdev->smpt_ops->set(mdev, dma_addr, i);
|
||
|
|
}
|
||
|
|
smpt_info->ref_count = 0;
|
||
|
|
smpt_info->map_count = 0;
|
||
|
|
smpt_info->unmap_count = 0;
|
||
|
|
return 0;
|
||
|
|
free_smpt:
|
||
|
|
kfree(smpt_info);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* mic_smpt_uninit - UnInitialize MIC System Memory Page Tables.
|
||
|
|
*
|
||
|
|
* @mdev: pointer to mic_device instance.
|
||
|
|
*
|
||
|
|
* returns None.
|
||
|
|
*/
|
||
|
|
void mic_smpt_uninit(struct mic_device *mdev)
|
||
|
|
{
|
||
|
|
struct mic_smpt_info *smpt_info = mdev->smpt;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
dev_dbg(&mdev->pdev->dev,
|
||
|
|
"nodeid %d SMPT ref count %lld map %lld unmap %lld\n",
|
||
|
|
mdev->id, smpt_info->ref_count,
|
||
|
|
smpt_info->map_count, smpt_info->unmap_count);
|
||
|
|
|
||
|
|
for (i = 0; i < smpt_info->info.num_reg; i++) {
|
||
|
|
dev_dbg(&mdev->pdev->dev,
|
||
|
|
"SMPT entry[%d] dma_addr = 0x%llx ref_count = %lld\n",
|
||
|
|
i, smpt_info->entry[i].dma_addr,
|
||
|
|
smpt_info->entry[i].ref_count);
|
||
|
|
if (smpt_info->entry[i].ref_count)
|
||
|
|
dev_warn(&mdev->pdev->dev,
|
||
|
|
"ref count for entry %d is not zero\n", i);
|
||
|
|
}
|
||
|
|
kfree(smpt_info->entry);
|
||
|
|
kfree(smpt_info);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* mic_smpt_restore - Restore MIC System Memory Page Tables.
|
||
|
|
*
|
||
|
|
* @mdev: pointer to mic_device instance.
|
||
|
|
*
|
||
|
|
* Restore the SMPT registers to values previously stored in the
|
||
|
|
* SW data structures. Some MIC steppings lose register state
|
||
|
|
* across resets and this API should be called for performing
|
||
|
|
* a restore operation if required.
|
||
|
|
*
|
||
|
|
* returns None.
|
||
|
|
*/
|
||
|
|
void mic_smpt_restore(struct mic_device *mdev)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
dma_addr_t dma_addr;
|
||
|
|
|
||
|
|
for (i = 0; i < mdev->smpt->info.num_reg; i++) {
|
||
|
|
dma_addr = mdev->smpt->entry[i].dma_addr;
|
||
|
|
mdev->smpt_ops->set(mdev, dma_addr, i);
|
||
|
|
}
|
||
|
|
}
|