[PATCH v4 10/23] nvme-pci: check DMA ops when indicating support for PCI P2PDMA
From: Logan Gunthorpe <logang@deltatee.com>
Date: 2021-11-17 21:55:38
Also in:
linux-iommu, linux-mm, linux-nvme, linux-pci, lkml
Subsystem:
nvm express driver, the rest · Maintainers:
Keith Busch, Jens Axboe, Christoph Hellwig, Sagi Grimberg, Linus Torvalds
Introduce a supports_pci_p2pdma() operation in nvme_ctrl_ops to replace the fixed NVME_F_PCI_P2PDMA flag such that the dma_map_ops flags can be checked for PCI P2PDMA support. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> --- drivers/nvme/host/core.c | 3 ++- drivers/nvme/host/nvme.h | 2 +- drivers/nvme/host/pci.c | 11 +++++++++-- 3 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 4b5de8f5435a..344414351314 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c@@ -3819,7 +3819,8 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid, blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, ns->queue); blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue); - if (ctrl->ops->flags & NVME_F_PCI_P2PDMA) + if (ctrl->ops->supports_pci_p2pdma && + ctrl->ops->supports_pci_p2pdma(ctrl)) blk_queue_flag_set(QUEUE_FLAG_PCI_P2PDMA, ns->queue); ns->ctrl = ctrl;
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index b334af8aa264..a9f60b12a32b 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h@@ -486,7 +486,6 @@ struct nvme_ctrl_ops { unsigned int flags; #define NVME_F_FABRICS (1 << 0) #define NVME_F_METADATA_SUPPORTED (1 << 1) -#define NVME_F_PCI_P2PDMA (1 << 2) int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val); int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val); int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
@@ -494,6 +493,7 @@ struct nvme_ctrl_ops { void (*submit_async_event)(struct nvme_ctrl *ctrl); void (*delete_ctrl)(struct nvme_ctrl *ctrl); int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size); + bool (*supports_pci_p2pdma)(struct nvme_ctrl *ctrl); }; /*
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index ca2ee806d74b..72f623999ba5 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c@@ -2900,17 +2900,24 @@ static int nvme_pci_get_address(struct nvme_ctrl *ctrl, char *buf, int size) return snprintf(buf, size, "%s\n", dev_name(&pdev->dev)); } +static bool nvme_pci_supports_pci_p2pdma(struct nvme_ctrl *ctrl) +{ + struct nvme_dev *dev = to_nvme_dev(ctrl); + + return dma_pci_p2pdma_supported(dev->dev); +} + static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { .name = "pcie", .module = THIS_MODULE, - .flags = NVME_F_METADATA_SUPPORTED | - NVME_F_PCI_P2PDMA, + .flags = NVME_F_METADATA_SUPPORTED, .reg_read32 = nvme_pci_reg_read32, .reg_write32 = nvme_pci_reg_write32, .reg_read64 = nvme_pci_reg_read64, .free_ctrl = nvme_pci_free_ctrl, .submit_async_event = nvme_pci_submit_async_event, .get_address = nvme_pci_get_address, + .supports_pci_p2pdma = nvme_pci_supports_pci_p2pdma, }; static int nvme_dev_map(struct nvme_dev *dev)
--
2.30.2