6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Damien Le Moal dlemoal@kernel.org
[ Upstream commit 2566cbea69ab8dad4996ab4b4840fd952e62e5b4 ]
There is no need to have each read, write and copy test functions check for the FLAG_USE_DMA flag against the DMA support status indicated by epf_test->dma_supported. Move this test to the command handler function pci_epf_test_cmd_handler() to check once for all cases.
Link: https://lore.kernel.org/r/20230415023542.77601-13-dlemoal@kernel.org Signed-off-by: Damien Le Moal dlemoal@kernel.org Signed-off-by: Lorenzo Pieralisi lpieralisi@kernel.org Signed-off-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Manivannan Sadhasivam mani@kernel.org Stable-dep-of: 235c2b197a8d ("PCI: endpoint: pci-epf-test: Fix check for DMA MEMCPY test") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/endpoint/functions/pci-epf-test.c | 45 +++++++------------ 1 file changed, 15 insertions(+), 30 deletions(-)
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c index be10d7b976e94..950fe67f2d3cc 100644 --- a/drivers/pci/endpoint/functions/pci-epf-test.c +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -328,7 +328,6 @@ static void pci_epf_test_print_rate(const char *ops, u64 size, static int pci_epf_test_copy(struct pci_epf_test *epf_test) { int ret; - bool use_dma; void __iomem *src_addr; void __iomem *dst_addr; phys_addr_t src_phys_addr; @@ -373,14 +372,7 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test) }
ktime_get_ts64(&start); - use_dma = !!(reg->flags & FLAG_USE_DMA); - if (use_dma) { - if (!epf_test->dma_supported) { - dev_err(dev, "Cannot transfer data using DMA\n"); - ret = -EINVAL; - goto err_map_addr; - } - + if (reg->flags & FLAG_USE_DMA) { if (epf_test->dma_private) { dev_err(dev, "Cannot transfer data using DMA\n"); ret = -EINVAL; @@ -406,7 +398,8 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test) kfree(buf); } ktime_get_ts64(&end); - pci_epf_test_print_rate("COPY", reg->size, &start, &end, use_dma); + pci_epf_test_print_rate("COPY", reg->size, &start, &end, + reg->flags & FLAG_USE_DMA);
err_map_addr: pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, dst_phys_addr); @@ -430,7 +423,6 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test) void __iomem *src_addr; void *buf; u32 crc32; - bool use_dma; phys_addr_t phys_addr; phys_addr_t dst_phys_addr; struct timespec64 start, end; @@ -463,14 +455,7 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test) goto err_map_addr; }
- use_dma = !!(reg->flags & FLAG_USE_DMA); - if (use_dma) { - if (!epf_test->dma_supported) { - dev_err(dev, "Cannot transfer data using DMA\n"); - ret = -EINVAL; - goto err_dma_map; - } - + if (reg->flags & FLAG_USE_DMA) { dst_phys_addr = dma_map_single(dma_dev, buf, reg->size, DMA_FROM_DEVICE); if (dma_mapping_error(dma_dev, dst_phys_addr)) { @@ -495,7 +480,8 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test) ktime_get_ts64(&end); }
- pci_epf_test_print_rate("READ", reg->size, &start, &end, use_dma); + pci_epf_test_print_rate("READ", reg->size, &start, &end, + reg->flags & FLAG_USE_DMA);
crc32 = crc32_le(~0, buf, reg->size); if (crc32 != reg->checksum) @@ -519,7 +505,6 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test) int ret; void __iomem *dst_addr; void *buf; - bool use_dma; phys_addr_t phys_addr; phys_addr_t src_phys_addr; struct timespec64 start, end; @@ -555,14 +540,7 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test) get_random_bytes(buf, reg->size); reg->checksum = crc32_le(~0, buf, reg->size);
- use_dma = !!(reg->flags & FLAG_USE_DMA); - if (use_dma) { - if (!epf_test->dma_supported) { - dev_err(dev, "Cannot transfer data using DMA\n"); - ret = -EINVAL; - goto err_dma_map; - } - + if (reg->flags & FLAG_USE_DMA) { src_phys_addr = dma_map_single(dma_dev, buf, reg->size, DMA_TO_DEVICE); if (dma_mapping_error(dma_dev, src_phys_addr)) { @@ -589,7 +567,8 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test) ktime_get_ts64(&end); }
- pci_epf_test_print_rate("WRITE", reg->size, &start, &end, use_dma); + pci_epf_test_print_rate("WRITE", reg->size, &start, &end, + reg->flags & FLAG_USE_DMA);
/* * wait 1ms inorder for the write to complete. Without this delay L3 @@ -660,6 +639,12 @@ static void pci_epf_test_cmd_handler(struct work_struct *work) reg->command = 0; reg->status = 0;
+ if ((READ_ONCE(reg->flags) & FLAG_USE_DMA) && + !epf_test->dma_supported) { + dev_err(dev, "Cannot transfer data using DMA\n"); + goto reset_handler; + } + if (reg->irq_type > IRQ_TYPE_MSIX) { dev_err(dev, "Failed to detect IRQ type\n"); goto reset_handler;