[PATCH 28/28] nvme-pci: use dma_alloc_pages backed dmapools
From: Christoph Hellwig
Date: Wed Aug 19 2020 - 02:58:43 EST
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@xxxxxx>
---
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);
}
--
2.28.0