This is a note to let you know that I've just added the patch titled
PCI: epf-test: Simplify DMA support checks
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-epf-test-simplify-dma-support-checks.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bdc4a09f49feb9529610a739d7b8157d177daa2c
Author: Damien Le Moal <dlemoal@xxxxxxxxxx>
Date: Sat Apr 15 11:35:37 2023 +0900
PCI: epf-test: Simplify DMA support checks
[ 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@xxxxxxxxxx
Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <mani@xxxxxxxxxx>
Stable-dep-of: 235c2b197a8d ("PCI: endpoint: pci-epf-test: Fix check for DMA MEMCPY test")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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;
