[RFC PATCH 07/11] PCI: endpoint: functions/pci-epf-test: Extend the test for continuous transfers

From: Shunsuke Mie
Date: Fri Mar 17 2023 - 07:33:52 EST

Next message: Shunsuke Mie: "[RFC PATCH 08/11] misc: pci_endpoint_test: Support a test of continuous transfer"
Previous message: Shunsuke Mie: "[RFC PATCH 06/11] misc: pci_endpoint_test: Use a common header file between endpoint driver"
In reply to: Frank Li: "RE: [EXT] [RFC PATCH 06/11] misc: pci_endpoint_test: Use a common header file between endpoint driver"
Next in thread: Shunsuke Mie: "[RFC PATCH 08/11] misc: pci_endpoint_test: Support a test of continuous transfer"
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The test could not test continuous DMAs because it was only synchronously
issuing a single DMA and waiting for it to complete.

Add a new parameter, `count` and extend the test for continuous transfers
to improve the test coverage.

Signed-off-by: Shunsuke Mie <mie@xxxxxxxxxx>
---
drivers/pci/endpoint/functions/pci-epf-test.c | 152 ++++++++++--------
1 file changed, 84 insertions(+), 68 deletions(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 99d8a05b8507..7898dfd956db 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -63,6 +63,7 @@ static void pci_epf_test_dma_callback(void *param)
* @dma_src: The source address of the data transfer. It can be a physical
* address given by pci_epc_mem_alloc_addr or DMA mapping APIs.
* @len: The size of the data transfer
+ * @count: The number of DMAs issuing in consecutive
* @dma_remote: remote RC physical address
* @dir: DMA transfer direction
*
@@ -74,7 +75,7 @@ static void pci_epf_test_dma_callback(void *param)
*/
static int pci_epf_test_data_transfer(struct pci_epf_test *epf_test,
dma_addr_t dma_dst, dma_addr_t dma_src,
- size_t len, dma_addr_t dma_remote,
+ size_t len, size_t count, dma_addr_t dma_remote,
enum dma_transfer_direction dir)
{
struct dma_chan *chan = (dir == DMA_MEM_TO_DEV) ?
@@ -87,47 +88,56 @@ static int pci_epf_test_data_transfer(struct pci_epf_test *epf_test,
struct device *dev = &epf->dev;
dma_cookie_t cookie;
int ret;
+ int i;
+ size_t offset;

if (IS_ERR_OR_NULL(chan)) {
dev_err(dev, "Invalid DMA memcpy channel\n");
return -EINVAL;
}

- if (epf_test->dma_private) {
- sconf.direction = dir;
- if (dir == DMA_MEM_TO_DEV)
- sconf.dst_addr = dma_remote;
- else
- sconf.src_addr = dma_remote;
+ for (i = 0, offset = 0; i < count; i++, offset += len) {
+ if (epf_test->dma_private) {
+ sconf.direction = dir;
+ if (dir == DMA_MEM_TO_DEV)
+ sconf.dst_addr = dma_remote + offset;
+ else
+ sconf.src_addr = dma_remote + offset;
+
+ if (dmaengine_slave_config(chan, &sconf)) {
+ dev_err(dev, "DMA slave config fail\n");
+ return -EIO;
+ }
+ tx = dmaengine_prep_slave_single(
+ chan, dma_local + offset, len, dir, flags);
+ } else {
+ tx = dmaengine_prep_dma_memcpy(chan, dma_dst + offset,
+ dma_src + offset, len,
+ flags);
+ }

- if (dmaengine_slave_config(chan, &sconf)) {
- dev_err(dev, "DMA slave config fail\n");
+ if (!tx) {
+ dev_err(dev, "Failed to prepare DMA memcpy\n");
return -EIO;
}
- tx = dmaengine_prep_slave_single(chan, dma_local, len, dir,
- flags);
- } else {
- tx = dmaengine_prep_dma_memcpy(chan, dma_dst, dma_src, len,
- flags);
- }

- if (!tx) {
- dev_err(dev, "Failed to prepare DMA memcpy\n");
- return -EIO;
- }
+ if (i == count - 1) {
+ tx->callback = pci_epf_test_dma_callback;
+ tx->callback_param = epf_test;
+ reinit_completion(&epf_test->transfer_complete);
+ }

- tx->callback = pci_epf_test_dma_callback;
- tx->callback_param = epf_test;
- cookie = tx->tx_submit(tx);
- reinit_completion(&epf_test->transfer_complete);
+ cookie = tx->tx_submit(tx);

- ret = dma_submit_error(cookie);
- if (ret) {
- dev_err(dev, "Failed to do DMA tx_submit %d\n", cookie);
- return -EIO;
+ ret = dma_submit_error(cookie);
+ if (ret) {
+ dev_err(dev, "Failed to do DMA tx_submit %d\n", cookie);
+ return -EIO;
+ }
+
+ dma_async_issue_pending(chan);
}

- dma_async_issue_pending(chan);
ret = wait_for_completion_interruptible(&epf_test->transfer_complete);
if (ret < 0) {
dmaengine_terminate_sync(chan);
@@ -244,7 +254,7 @@ static void pci_epf_test_clean_dma_chan(struct pci_epf_test *epf_test)
return;
}

-static void pci_epf_test_print_rate(const char *ops, u64 size,
+static void pci_epf_test_print_rate(const char *ops, u64 size, u32 count,
struct timespec64 *start,
struct timespec64 *end, bool dma)
{
@@ -255,7 +265,7 @@ static void pci_epf_test_print_rate(const char *ops, u64 size,

/* convert both size (stored in 'rate') and time in terms of 'ns' */
ns = timespec64_to_ns(&ts);
- rate = size * NSEC_PER_SEC;
+ rate = size * count * NSEC_PER_SEC;

/* Divide both size (stored in 'rate') and ns by a common factor */
while (ns > UINT_MAX) {
@@ -269,14 +279,14 @@ static void pci_epf_test_print_rate(const char *ops, u64 size,
/* calculate the rate */
do_div(rate, (uint32_t)ns);

- pr_info("\n%s => Size: %llu bytes\t DMA: %s\t Time: %llu.%09u seconds\t"
- "Rate: %llu KB/s\n", ops, size, dma ? "YES" : "NO",
+ pr_info("\n%s => Size: %llu bytes\tcount %d\t DMA: %s\t Time: %llu.%09u seconds\t"
+ "Rate: %llu KB/s\n", ops, size, count, dma ? "YES" : "NO",
(u64)ts.tv_sec, (u32)ts.tv_nsec, rate / 1024);
}

static int pci_epf_test_copy(struct pci_epf_test *epf_test)
{
- int ret;
+ int ret, i;
bool use_dma;
void __iomem *src_addr;
void __iomem *dst_addr;
@@ -288,8 +298,9 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
struct pci_epc *epc = epf->epc;
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
+ size_t offset;

- src_addr = pci_epc_mem_alloc_addr(epc, &src_phys_addr, reg->size);
+ src_addr = pci_epc_mem_alloc_addr(epc, &src_phys_addr, reg->size * reg->count);
if (!src_addr) {
dev_err(dev, "Failed to allocate source address\n");
reg->status = STATUS_SRC_ADDR_INVALID;
@@ -298,14 +309,14 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
}

ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, src_phys_addr,
- reg->src_addr, reg->size);
+ reg->src_addr, reg->size * reg->count);
if (ret) {
dev_err(dev, "Failed to map source address\n");
reg->status = STATUS_SRC_ADDR_INVALID;
goto err_src_addr;
}

- dst_addr = pci_epc_mem_alloc_addr(epc, &dst_phys_addr, reg->size);
+ dst_addr = pci_epc_mem_alloc_addr(epc, &dst_phys_addr, reg->size * reg->count);
if (!dst_addr) {
dev_err(dev, "Failed to allocate destination address\n");
reg->status = STATUS_DST_ADDR_INVALID;
@@ -314,7 +325,7 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
}

ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, dst_phys_addr,
- reg->dst_addr, reg->size);
+ reg->dst_addr, reg->size * reg->count);
if (ret) {
dev_err(dev, "Failed to map destination address\n");
reg->status = STATUS_DST_ADDR_INVALID;
@@ -337,7 +348,7 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)

ktime_get_ts64(&start);
ret = pci_epf_test_data_transfer(epf_test, dst_phys_addr,
- src_phys_addr, reg->size, 0,
+ src_phys_addr, reg->size, reg->count, 0,
DMA_MEM_TO_MEM);
ktime_get_ts64(&end);
if (ret)
@@ -345,32 +356,33 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
} else {
void *buf;

- buf = kzalloc(reg->size, GFP_KERNEL);
+ buf = kzalloc(reg->size * reg->count, GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
goto err_map_addr;
}

ktime_get_ts64(&start);
- memcpy_fromio(buf, src_addr, reg->size);
- memcpy_toio(dst_addr, buf, reg->size);
+ for (i = 0, offset = 0; i < reg->count; i++, offset += reg->size) {
+ memcpy_fromio(buf + offset, src_addr + offset, reg->size);
+ memcpy_toio(dst_addr + offset, buf + offset, reg->size);
+ }
ktime_get_ts64(&end);
kfree(buf);
}
-
- pci_epf_test_print_rate("COPY", reg->size, &start, &end, use_dma);
+ pci_epf_test_print_rate("COPY", reg->size, reg->count, &start, &end, use_dma);

err_map_addr:
pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, dst_phys_addr);

err_dst_addr:
- pci_epc_mem_free_addr(epc, dst_phys_addr, dst_addr, reg->size);
+ pci_epc_mem_free_addr(epc, dst_phys_addr, dst_addr, reg->size * reg->count);

err_src_map_addr:
pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, src_phys_addr);

err_src_addr:
- pci_epc_mem_free_addr(epc, src_phys_addr, src_addr, reg->size);
+ pci_epc_mem_free_addr(epc, src_phys_addr, src_addr, reg->size * reg->count);

err:
return ret;
@@ -378,7 +390,7 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)

static int pci_epf_test_read(struct pci_epf_test *epf_test)
{
- int ret;
+ int ret, i;
void __iomem *src_addr;
void *buf;
u32 crc32;
@@ -392,8 +404,9 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
struct device *dma_dev = epf->epc->dev.parent;
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
+ size_t offset;

- src_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
+ src_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size * reg->count);
if (!src_addr) {
dev_err(dev, "Failed to allocate address\n");
reg->status = STATUS_SRC_ADDR_INVALID;
@@ -402,14 +415,14 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
}

ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, phys_addr,
- reg->src_addr, reg->size);
+ reg->src_addr, reg->size * reg->count);
if (ret) {
dev_err(dev, "Failed to map address\n");
reg->status = STATUS_SRC_ADDR_INVALID;
goto err_addr;
}

- buf = kzalloc(reg->size, GFP_KERNEL);
+ buf = kzalloc(reg->size * reg->count, GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
goto err_map_addr;
@@ -423,7 +436,7 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
goto err_dma_map;
}

- dst_phys_addr = dma_map_single(dma_dev, buf, reg->size,
+ dst_phys_addr = dma_map_single(dma_dev, buf, reg->size * reg->count,
DMA_FROM_DEVICE);
if (dma_mapping_error(dma_dev, dst_phys_addr)) {
dev_err(dev, "Failed to map destination buffer addr\n");
@@ -433,23 +446,24 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)

ktime_get_ts64(&start);
ret = pci_epf_test_data_transfer(epf_test, dst_phys_addr,
- phys_addr, reg->size,
+ phys_addr, reg->size, reg->count,
reg->src_addr, DMA_DEV_TO_MEM);
ktime_get_ts64(&end);
if (ret)
dev_err(dev, "Data transfer failed\n");

- dma_unmap_single(dma_dev, dst_phys_addr, reg->size,
+ dma_unmap_single(dma_dev, dst_phys_addr, reg->size * reg->count,
DMA_FROM_DEVICE);
} else {
ktime_get_ts64(&start);
- memcpy_fromio(buf, src_addr, reg->size);
+ for (i = 0, offset = 0; i < reg->count; i++, offset += reg->size)
+ memcpy_fromio(buf + offset, src_addr + offset, reg->size);
ktime_get_ts64(&end);
}

- pci_epf_test_print_rate("READ", reg->size, &start, &end, use_dma);
+ pci_epf_test_print_rate("READ", reg->size, reg->count, &start, &end, use_dma);

- crc32 = crc32_le(~0, buf, reg->size);
+ crc32 = crc32_le(~0, buf, reg->size * reg->count);
if (crc32 != reg->checksum)
ret = -EIO;

@@ -460,7 +474,7 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, phys_addr);

err_addr:
- pci_epc_mem_free_addr(epc, phys_addr, src_addr, reg->size);
+ pci_epc_mem_free_addr(epc, phys_addr, src_addr, reg->size * reg->count);

err:
return ret;
@@ -468,7 +482,7 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)

static int pci_epf_test_write(struct pci_epf_test *epf_test)
{
- int ret;
+ int ret, i;
void __iomem *dst_addr;
void *buf;
bool use_dma;
@@ -481,8 +495,9 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
struct device *dma_dev = epf->epc->dev.parent;
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
+ size_t offset;

- dst_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
+ dst_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size * reg->count);
if (!dst_addr) {
dev_err(dev, "Failed to allocate address\n");
reg->status = STATUS_DST_ADDR_INVALID;
@@ -491,21 +506,21 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
}

ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, phys_addr,
- reg->dst_addr, reg->size);
+ reg->dst_addr, reg->size * reg->count);
if (ret) {
dev_err(dev, "Failed to map address\n");
reg->status = STATUS_DST_ADDR_INVALID;
goto err_addr;
}

- buf = kzalloc(reg->size, GFP_KERNEL);
+ buf = kzalloc(reg->size * reg->count, GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
goto err_map_addr;
}

- get_random_bytes(buf, reg->size);
- reg->checksum = crc32_le(~0, buf, reg->size);
+ get_random_bytes(buf, reg->size * reg->count);
+ reg->checksum = crc32_le(~0, buf, reg->size * reg->count);

use_dma = !!(reg->flags & FLAG_USE_DMA);
if (use_dma) {
@@ -515,7 +530,7 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
goto err_dma_map;
}

- src_phys_addr = dma_map_single(dma_dev, buf, reg->size,
+ src_phys_addr = dma_map_single(dma_dev, buf, reg->size * reg->count,
DMA_TO_DEVICE);
if (dma_mapping_error(dma_dev, src_phys_addr)) {
dev_err(dev, "Failed to map source buffer addr\n");
@@ -525,22 +540,23 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)

ktime_get_ts64(&start);
ret = pci_epf_test_data_transfer(epf_test, phys_addr,
- src_phys_addr, reg->size,
+ src_phys_addr, reg->size, reg->count,
reg->dst_addr,
DMA_MEM_TO_DEV);
ktime_get_ts64(&end);
if (ret)
dev_err(dev, "Data transfer failed\n");

- dma_unmap_single(dma_dev, src_phys_addr, reg->size,
+ dma_unmap_single(dma_dev, src_phys_addr, reg->size * reg->count,
DMA_TO_DEVICE);
} else {
ktime_get_ts64(&start);
- memcpy_toio(dst_addr, buf, reg->size);
+ for (i = 0, offset = 0; i < reg->count; i++, offset += reg->size)
+ memcpy_toio(dst_addr + offset, buf + offset, reg->size);
ktime_get_ts64(&end);
}

- pci_epf_test_print_rate("WRITE", reg->size, &start, &end, use_dma);
+ pci_epf_test_print_rate("WRITE", reg->size, reg->count, &start, &end, use_dma);

/*
* wait 1ms inorder for the write to complete. Without this delay L3
@@ -555,7 +571,7 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, phys_addr);

err_addr:
- pci_epc_mem_free_addr(epc, phys_addr, dst_addr, reg->size);
+ pci_epc_mem_free_addr(epc, phys_addr, dst_addr, reg->size * reg->count);

err:
return ret;
--
2.25.1

Next message: Shunsuke Mie: "[RFC PATCH 08/11] misc: pci_endpoint_test: Support a test of continuous transfer"
Previous message: Shunsuke Mie: "[RFC PATCH 06/11] misc: pci_endpoint_test: Use a common header file between endpoint driver"
In reply to: Frank Li: "RE: [EXT] [RFC PATCH 06/11] misc: pci_endpoint_test: Use a common header file between endpoint driver"
Next in thread: Shunsuke Mie: "[RFC PATCH 08/11] misc: pci_endpoint_test: Support a test of continuous transfer"
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