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111d746bb4
Add message support in order to be able to communicate to VK card via message queues. This info is used for debug purposes via collection of logs via direct read of BAR space and by sysfs access (in a follow on commit). Co-developed-by: Desmond Yan <desmond.yan@broadcom.com> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Desmond Yan <desmond.yan@broadcom.com> Signed-off-by: Scott Branden <scott.branden@broadcom.com> Link: https://lore.kernel.org/r/20210120175827.14820-10-scott.branden@broadcom.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
276 lines
6.3 KiB
C
276 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2018-2020 Broadcom.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/pgtable.h>
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#include <linux/vmalloc.h>
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#include <asm/page.h>
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#include <asm/unaligned.h>
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#include <uapi/linux/misc/bcm_vk.h>
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#include "bcm_vk.h"
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#include "bcm_vk_msg.h"
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#include "bcm_vk_sg.h"
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/*
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* Valkyrie has a hardware limitation of 16M transfer size.
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* So limit the SGL chunks to 16M.
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*/
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#define BCM_VK_MAX_SGL_CHUNK SZ_16M
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static int bcm_vk_dma_alloc(struct device *dev,
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struct bcm_vk_dma *dma,
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int dir,
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struct _vk_data *vkdata);
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static int bcm_vk_dma_free(struct device *dev, struct bcm_vk_dma *dma);
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/* Uncomment to dump SGLIST */
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/* #define BCM_VK_DUMP_SGLIST */
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static int bcm_vk_dma_alloc(struct device *dev,
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struct bcm_vk_dma *dma,
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int direction,
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struct _vk_data *vkdata)
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{
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dma_addr_t addr, sg_addr;
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int err;
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int i;
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int offset;
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u32 size;
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u32 remaining_size;
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u32 transfer_size;
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u64 data;
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unsigned long first, last;
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struct _vk_data *sgdata;
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/* Get 64-bit user address */
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data = get_unaligned(&vkdata->address);
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/* offset into first page */
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offset = offset_in_page(data);
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/* Calculate number of pages */
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first = (data & PAGE_MASK) >> PAGE_SHIFT;
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last = ((data + vkdata->size - 1) & PAGE_MASK) >> PAGE_SHIFT;
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dma->nr_pages = last - first + 1;
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/* Allocate DMA pages */
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dma->pages = kmalloc_array(dma->nr_pages,
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sizeof(struct page *),
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GFP_KERNEL);
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if (!dma->pages)
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return -ENOMEM;
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dev_dbg(dev, "Alloc DMA Pages [0x%llx+0x%x => %d pages]\n",
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data, vkdata->size, dma->nr_pages);
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dma->direction = direction;
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/* Get user pages into memory */
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err = get_user_pages_fast(data & PAGE_MASK,
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dma->nr_pages,
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direction == DMA_FROM_DEVICE,
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dma->pages);
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if (err != dma->nr_pages) {
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dma->nr_pages = (err >= 0) ? err : 0;
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dev_err(dev, "get_user_pages_fast, err=%d [%d]\n",
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err, dma->nr_pages);
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return err < 0 ? err : -EINVAL;
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}
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/* Max size of sg list is 1 per mapped page + fields at start */
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dma->sglen = (dma->nr_pages * sizeof(*sgdata)) +
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(sizeof(u32) * SGLIST_VKDATA_START);
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/* Allocate sglist */
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dma->sglist = dma_alloc_coherent(dev,
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dma->sglen,
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&dma->handle,
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GFP_KERNEL);
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if (!dma->sglist)
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return -ENOMEM;
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dma->sglist[SGLIST_NUM_SG] = 0;
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dma->sglist[SGLIST_TOTALSIZE] = vkdata->size;
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remaining_size = vkdata->size;
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sgdata = (struct _vk_data *)&dma->sglist[SGLIST_VKDATA_START];
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/* Map all pages into DMA */
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size = min_t(size_t, PAGE_SIZE - offset, remaining_size);
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remaining_size -= size;
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sg_addr = dma_map_page(dev,
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dma->pages[0],
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offset,
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size,
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dma->direction);
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transfer_size = size;
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if (unlikely(dma_mapping_error(dev, sg_addr))) {
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__free_page(dma->pages[0]);
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return -EIO;
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}
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for (i = 1; i < dma->nr_pages; i++) {
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size = min_t(size_t, PAGE_SIZE, remaining_size);
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remaining_size -= size;
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addr = dma_map_page(dev,
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dma->pages[i],
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0,
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size,
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dma->direction);
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if (unlikely(dma_mapping_error(dev, addr))) {
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__free_page(dma->pages[i]);
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return -EIO;
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}
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/*
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* Compress SG list entry when pages are contiguous
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* and transfer size less or equal to BCM_VK_MAX_SGL_CHUNK
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*/
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if ((addr == (sg_addr + transfer_size)) &&
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((transfer_size + size) <= BCM_VK_MAX_SGL_CHUNK)) {
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/* pages are contiguous, add to same sg entry */
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transfer_size += size;
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} else {
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/* pages are not contiguous, write sg entry */
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sgdata->size = transfer_size;
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put_unaligned(sg_addr, (u64 *)&sgdata->address);
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dma->sglist[SGLIST_NUM_SG]++;
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/* start new sg entry */
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sgdata++;
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sg_addr = addr;
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transfer_size = size;
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}
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}
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/* Write last sg list entry */
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sgdata->size = transfer_size;
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put_unaligned(sg_addr, (u64 *)&sgdata->address);
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dma->sglist[SGLIST_NUM_SG]++;
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/* Update pointers and size field to point to sglist */
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put_unaligned((u64)dma->handle, &vkdata->address);
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vkdata->size = (dma->sglist[SGLIST_NUM_SG] * sizeof(*sgdata)) +
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(sizeof(u32) * SGLIST_VKDATA_START);
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#ifdef BCM_VK_DUMP_SGLIST
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dev_dbg(dev,
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"sgl 0x%llx handle 0x%llx, sglen: 0x%x sgsize: 0x%x\n",
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(u64)dma->sglist,
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dma->handle,
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dma->sglen,
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vkdata->size);
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for (i = 0; i < vkdata->size / sizeof(u32); i++)
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dev_dbg(dev, "i:0x%x 0x%x\n", i, dma->sglist[i]);
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#endif
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return 0;
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}
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int bcm_vk_sg_alloc(struct device *dev,
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struct bcm_vk_dma *dma,
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int dir,
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struct _vk_data *vkdata,
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int num)
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{
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int i;
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int rc = -EINVAL;
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/* Convert user addresses to DMA SG List */
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for (i = 0; i < num; i++) {
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if (vkdata[i].size && vkdata[i].address) {
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/*
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* If both size and address are non-zero
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* then DMA alloc.
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*/
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rc = bcm_vk_dma_alloc(dev,
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&dma[i],
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dir,
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&vkdata[i]);
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} else if (vkdata[i].size ||
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vkdata[i].address) {
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/*
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* If one of size and address are zero
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* there is a problem.
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*/
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dev_err(dev,
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"Invalid vkdata %x 0x%x 0x%llx\n",
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i, vkdata[i].size, vkdata[i].address);
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rc = -EINVAL;
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} else {
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/*
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* If size and address are both zero
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* don't convert, but return success.
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*/
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rc = 0;
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}
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if (rc)
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goto fail_alloc;
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}
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return rc;
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fail_alloc:
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while (i > 0) {
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i--;
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if (dma[i].sglist)
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bcm_vk_dma_free(dev, &dma[i]);
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}
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return rc;
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}
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static int bcm_vk_dma_free(struct device *dev, struct bcm_vk_dma *dma)
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{
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dma_addr_t addr;
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int i;
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int num_sg;
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u32 size;
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struct _vk_data *vkdata;
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dev_dbg(dev, "free sglist=%p sglen=0x%x\n", dma->sglist, dma->sglen);
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/* Unmap all pages in the sglist */
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num_sg = dma->sglist[SGLIST_NUM_SG];
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vkdata = (struct _vk_data *)&dma->sglist[SGLIST_VKDATA_START];
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for (i = 0; i < num_sg; i++) {
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size = vkdata[i].size;
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addr = get_unaligned(&vkdata[i].address);
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dma_unmap_page(dev, addr, size, dma->direction);
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}
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/* Free allocated sglist */
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dma_free_coherent(dev, dma->sglen, dma->sglist, dma->handle);
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/* Release lock on all pages */
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for (i = 0; i < dma->nr_pages; i++)
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put_page(dma->pages[i]);
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/* Free allocated dma pages */
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kfree(dma->pages);
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dma->sglist = NULL;
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return 0;
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}
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int bcm_vk_sg_free(struct device *dev, struct bcm_vk_dma *dma, int num,
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int *proc_cnt)
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{
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int i;
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*proc_cnt = 0;
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/* Unmap and free all pages and sglists */
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for (i = 0; i < num; i++) {
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if (dma[i].sglist) {
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bcm_vk_dma_free(dev, &dma[i]);
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*proc_cnt += 1;
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}
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}
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return 0;
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}
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