Switch from coherent DMA pools to those backed by dma_alloc_pages. This helps device with non-coherent DMA to avoid host accesses to uncached memory for every submission of a larger than single entry I/O.
Signed-off-by: Christoph Hellwig hch@lst.de --- drivers/nvme/host/pci.c | 80 ++++++++++++++++++++--------------------- 1 file changed, 40 insertions(+), 40 deletions(-)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index a33adab62acbaf..fb34dbcb973673 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -114,8 +114,8 @@ struct nvme_dev { struct blk_mq_tag_set admin_tagset; u32 __iomem *dbs; struct device *dev; - struct dma_pool *prp_page_pool; - struct dma_pool *prp_small_pool; + struct dma_pool prp_page_pool; + struct dma_pool prp_small_pool; unsigned online_queues; unsigned max_qid; unsigned io_queues[HCTX_MAX_TYPES]; @@ -536,7 +536,7 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
if (iod->npages == 0) - dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0], + dma_pool_free(&dev->prp_small_pool, nvme_pci_iod_list(req)[0], dma_addr);
for (i = 0; i < iod->npages; i++) { @@ -553,7 +553,7 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) next_dma_addr = le64_to_cpu(prp_list[last_prp]); }
- dma_pool_free(dev->prp_page_pool, addr, dma_addr); + dma_pool_free(&dev->prp_page_pool, addr, dma_addr); dma_addr = next_dma_addr; }
@@ -611,10 +611,10 @@ static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev,
nprps = DIV_ROUND_UP(length, NVME_CTRL_PAGE_SIZE); if (nprps <= (256 / 8)) { - pool = dev->prp_small_pool; + pool = &dev->prp_small_pool; iod->npages = 0; } else { - pool = dev->prp_page_pool; + pool = &dev->prp_page_pool; iod->npages = 1; }
@@ -630,6 +630,11 @@ static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev, for (;;) { if (i == NVME_CTRL_PAGE_SIZE >> 3) { __le64 *old_prp_list = prp_list; + + dma_sync_single_for_device(dev->dev, prp_dma, + i * sizeof(*prp_list), + DMA_TO_DEVICE); + prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); if (!prp_list) return BLK_STS_RESOURCE; @@ -653,6 +658,8 @@ static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev, dma_len = sg_dma_len(sg); }
+ dma_sync_single_for_device(dev->dev, prp_dma, i * sizeof(*prp_list), + DMA_TO_DEVICE); done: cmnd->dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma); @@ -706,10 +713,10 @@ static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, }
if (entries <= (256 / sizeof(struct nvme_sgl_desc))) { - pool = dev->prp_small_pool; + pool = &dev->prp_small_pool; iod->npages = 0; } else { - pool = dev->prp_page_pool; + pool = &dev->prp_page_pool; iod->npages = 1; }
@@ -728,6 +735,10 @@ static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, if (i == SGES_PER_PAGE) { struct nvme_sgl_desc *old_sg_desc = sg_list; struct nvme_sgl_desc *link = &old_sg_desc[i - 1]; + + dma_sync_single_for_device(dev->dev, sgl_dma, + i * sizeof(*sg_list), + DMA_TO_DEVICE);
sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma); if (!sg_list) @@ -743,6 +754,8 @@ static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, sg = sg_next(sg); } while (--entries > 0);
+ dma_sync_single_for_device(dev->dev, sgl_dma, i * sizeof(*sg_list), + DMA_TO_DEVICE); return BLK_STS_OK; }
@@ -2457,30 +2470,6 @@ static int nvme_disable_prepare_reset(struct nvme_dev *dev, bool shutdown) return 0; }
-static int nvme_setup_prp_pools(struct nvme_dev *dev) -{ - dev->prp_page_pool = dma_pool_create("prp list page", dev->dev, - NVME_CTRL_PAGE_SIZE, - NVME_CTRL_PAGE_SIZE, 0); - if (!dev->prp_page_pool) - return -ENOMEM; - - /* Optimisation for I/Os between 4k and 128k */ - dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev, - 256, 256, 0); - if (!dev->prp_small_pool) { - dma_pool_destroy(dev->prp_page_pool); - return -ENOMEM; - } - return 0; -} - -static void nvme_release_prp_pools(struct nvme_dev *dev) -{ - dma_pool_destroy(dev->prp_page_pool); - dma_pool_destroy(dev->prp_small_pool); -} - static void nvme_free_tagset(struct nvme_dev *dev) { if (dev->tagset.tags) @@ -2851,10 +2840,6 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work); mutex_init(&dev->shutdown_lock);
- result = nvme_setup_prp_pools(dev); - if (result) - goto unmap; - quirks |= check_vendor_combination_bug(pdev);
if (!noacpi && nvme_acpi_storage_d3(pdev)) { @@ -2867,6 +2852,18 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) quirks |= NVME_QUIRK_SIMPLE_SUSPEND; }
+ result = dma_pool_init(dev->dev, &dev->prp_page_pool, "prp list page", + NVME_CTRL_PAGE_SIZE, NVME_CTRL_PAGE_SIZE, 0, + DMA_TO_DEVICE); + if (result) + goto unmap; + + /* Optimisation for I/Os between 4k and 128k */ + result = dma_pool_init(dev->dev, &dev->prp_small_pool, "prp list 256", + 256, 256, 0, DMA_TO_DEVICE); + if (result) + goto release_prp_page_pool; + /* * Double check that our mempool alloc size will cover the biggest * command we support. @@ -2880,7 +2877,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) GFP_KERNEL, node); if (!dev->iod_mempool) { result = -ENOMEM; - goto release_pools; + goto release_prp_small_pool; }
result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops, @@ -2897,8 +2894,10 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
release_mempool: mempool_destroy(dev->iod_mempool); - release_pools: - nvme_release_prp_pools(dev); + release_prp_small_pool: + dma_pool_exit(&dev->prp_small_pool); + release_prp_page_pool: + dma_pool_exit(&dev->prp_page_pool); unmap: nvme_dev_unmap(dev); put_pci: @@ -2963,7 +2962,8 @@ static void nvme_remove(struct pci_dev *pdev) nvme_free_host_mem(dev); nvme_dev_remove_admin(dev); nvme_free_queues(dev, 0); - nvme_release_prp_pools(dev); + dma_pool_exit(&dev->prp_small_pool); + dma_pool_exit(&dev->prp_page_pool); nvme_dev_unmap(dev); nvme_uninit_ctrl(&dev->ctrl); }