[PATCH 05/19] PCI: endpoint: test: Use pci_epc_mem_map/unmap()

Damien Le Moal
2024-03-29T09:09:55Z

Modify the endpoint test driver to use the functions pci_epc_mem_map()
and pci_epc_mem_unmap() for the read, write and copy tests. For each
test case, the transfer (dma or mmio) are executed in a loop to ensure
that potentially partial mappings returned by pci_epc_mem_map() are
correctly handled.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
---
drivers/pci/endpoint/functions/pci-epf-test.c | 378 +++++++++---------
1 file changed, 197 insertions(+), 181 deletions(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index cd4ffb39dcdc..0e285e539538 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -317,91 +317,94 @@ static void pci_epf_test_print_rate(struct pci_epf_test *epf_test,
static void pci_epf_test_copy(struct pci_epf_test *epf_test,
struct pci_epf_test_reg *reg)
{
- int ret;
- void __iomem *src_addr;
- void __iomem *dst_addr;
- phys_addr_t src_phys_addr;
- phys_addr_t dst_phys_addr;
+ int ret = 0;
struct timespec64 start, end;
struct pci_epf *epf = epf_test->epf;
- struct device *dev = &epf->dev;
struct pci_epc *epc = epf->epc;
+ struct device *dev = &epf->dev;
+ struct pci_epc_map src_map, dst_map;
+ u64 src_addr = reg->src_addr;
+ u64 dst_addr = reg->dst_addr;
+ size_t copy_size = reg->size;
+ ssize_t map_size = 0;
+ void *copy_buf = NULL, *buf;

- src_addr = pci_epc_mem_alloc_addr(epc, &src_phys_addr, reg->size);
- if (!src_addr) {
- dev_err(dev, "Failed to allocate source address\n");
- reg->status = STATUS_SRC_ADDR_INVALID;
- ret = -ENOMEM;
- goto err;
- }
-
- ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, src_phys_addr,
- reg->src_addr, reg->size);
- 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);
- if (!dst_addr) {
- dev_err(dev, "Failed to allocate destination address\n");
- reg->status = STATUS_DST_ADDR_INVALID;
- ret = -ENOMEM;
- goto err_src_map_addr;
- }
-
- ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, dst_phys_addr,
- reg->dst_addr, reg->size);
- if (ret) {
- dev_err(dev, "Failed to map destination address\n");
- reg->status = STATUS_DST_ADDR_INVALID;
- goto err_dst_addr;
- }
-
- ktime_get_ts64(&start);
if (reg->flags & FLAG_USE_DMA) {
if (epf_test->dma_private) {
dev_err(dev, "Cannot transfer data using DMA\n");
ret = -EINVAL;
- goto err_map_addr;
+ goto set_status;
}
-
- ret = pci_epf_test_data_transfer(epf_test, dst_phys_addr,
- src_phys_addr, reg->size, 0,
- DMA_MEM_TO_MEM);
- if (ret)
- dev_err(dev, "Data transfer failed\n");
} else {
- void *buf;
-
- buf = kzalloc(reg->size, GFP_KERNEL);
- if (!buf) {
+ copy_buf = kzalloc(copy_size, GFP_KERNEL);
+ if (!copy_buf) {
ret = -ENOMEM;
- goto err_map_addr;
+ goto set_status;
}
-
- memcpy_fromio(buf, src_addr, reg->size);
- memcpy_toio(dst_addr, buf, reg->size);
- kfree(buf);
+ buf = copy_buf;
}
- ktime_get_ts64(&end);
- pci_epf_test_print_rate(epf_test, "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);
+ while (copy_size) {
+ map_size = pci_epc_mem_map(epc, epf->func_no, epf->vfunc_no,
+ src_addr, copy_size, &src_map);
+ if (map_size < 0) {
+ dev_err(dev, "Failed to map source address\n");
+ reg->status = STATUS_SRC_ADDR_INVALID;
+ ret = map_size;
+ goto free_buf;
+ }
+
+ map_size = pci_epc_mem_map(epf->epc, epf->func_no, epf->vfunc_no,
+ dst_addr, copy_size, &dst_map);
+ if (map_size < 0) {
+ dev_err(dev, "Failed to map destination address\n");
+ reg->status = STATUS_DST_ADDR_INVALID;
+ ret = map_size;
+ pci_epc_mem_unmap(epc, epf->func_no, epf->vfunc_no,
+ &src_map);
+ goto free_buf;
+ }
+
+ map_size = min_t(size_t, map_size, src_map.pci_size);
+
+ ktime_get_ts64(&start);
+ if (reg->flags & FLAG_USE_DMA) {
+ ret = pci_epf_test_data_transfer(epf_test,
+ dst_map.phys_addr, src_map.phys_addr,
+ map_size, 0, DMA_MEM_TO_MEM);
+ if (ret) {
+ dev_err(dev, "Data transfer failed\n");
+ goto unmap;
+ }
+ } else {
+ memcpy_fromio(buf, src_map.virt_addr, map_size);
+ memcpy_toio(dst_map.virt_addr, buf, map_size);
+ buf += map_size;
+ }
+ ktime_get_ts64(&end);
+
+ copy_size -= map_size;
+ src_addr += map_size;
+ dst_addr += map_size;

-err_dst_addr:
- pci_epc_mem_free_addr(epc, dst_phys_addr, dst_addr, reg->size);
+ pci_epc_mem_unmap(epc, epf->func_no, epf->vfunc_no, &dst_map);
+ pci_epc_mem_unmap(epc, epf->func_no, epf->vfunc_no, &src_map);
+ map_size = 0;
+ }

-err_src_map_addr:
- pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, src_phys_addr);
+ pci_epf_test_print_rate(epf_test, "COPY", reg->size, &start,
+ &end, reg->flags & FLAG_USE_DMA);
+
+unmap:
+ if (map_size) {
+ pci_epc_mem_unmap(epc, epf->func_no, epf->vfunc_no, &dst_map);
+ pci_epc_mem_unmap(epc, epf->func_no, epf->vfunc_no, &src_map);
+ }

-err_src_addr:
- pci_epc_mem_free_addr(epc, src_phys_addr, src_addr, reg->size);
+free_buf:
+ kfree(copy_buf);

-err:
+set_status:
if (!ret)
reg->status |= STATUS_COPY_SUCCESS;
else
@@ -411,82 +414,89 @@ static void pci_epf_test_copy(struct pci_epf_test *epf_test,
static void pci_epf_test_read(struct pci_epf_test *epf_test,
struct pci_epf_test_reg *reg)
{
- int ret;
- void __iomem *src_addr;
- void *buf;
+ int ret = 0;
+ void *src_buf, *buf;
u32 crc32;
- phys_addr_t phys_addr;
+ struct pci_epc_map map;
phys_addr_t dst_phys_addr;
struct timespec64 start, end;
struct pci_epf *epf = epf_test->epf;
- struct device *dev = &epf->dev;
struct pci_epc *epc = epf->epc;
+ struct device *dev = &epf->dev;
struct device *dma_dev = epf->epc->dev.parent;
+ u64 src_addr = reg->src_addr;
+ size_t src_size = reg->size;
+ ssize_t map_size = 0;

- src_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
- if (!src_addr) {
- dev_err(dev, "Failed to allocate address\n");
- reg->status = STATUS_SRC_ADDR_INVALID;
+ src_buf = kzalloc(src_size, GFP_KERNEL);
+ if (!src_buf) {
ret = -ENOMEM;
- goto err;
- }
-
- ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, phys_addr,
- reg->src_addr, reg->size);
- 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);
- if (!buf) {
- ret = -ENOMEM;
- goto err_map_addr;
+ goto set_status;
}
+ buf = src_buf;
+
+ while (src_size) {
+ map_size = pci_epc_mem_map(epc, epf->func_no, epf->vfunc_no,
+ src_addr, src_size, &map);
+ if (map_size < 0) {
+ dev_err(dev, "Failed to map address\n");
+ reg->status = STATUS_SRC_ADDR_INVALID;
+ ret = map_size;
+ goto free_buf;
+ }

- 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)) {
- dev_err(dev, "Failed to map destination buffer addr\n");
- ret = -ENOMEM;
- goto err_dma_map;
+ if (reg->flags & FLAG_USE_DMA) {
+ dst_phys_addr = dma_map_single(dma_dev, buf, map_size,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(dma_dev, dst_phys_addr)) {
+ dev_err(dev,
+ "Failed to map destination buffer addr\n");
+ ret = -ENOMEM;
+ goto unmap;
+ }
+
+ ktime_get_ts64(&start);
+ ret = pci_epf_test_data_transfer(epf_test,
+ dst_phys_addr, map.phys_addr,
+ map_size, src_addr, DMA_DEV_TO_MEM);
+ if (ret)
+ dev_err(dev, "Data transfer failed\n");
+ ktime_get_ts64(&end);
+
+ dma_unmap_single(dma_dev, dst_phys_addr, map_size,
+ DMA_FROM_DEVICE);
+
+ if (ret)
+ goto unmap;
+ } else {
+ ktime_get_ts64(&start);
+ memcpy_fromio(buf, map.virt_addr, map_size);
+ ktime_get_ts64(&end);
}

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

- dma_unmap_single(dma_dev, dst_phys_addr, reg->size,
- DMA_FROM_DEVICE);
- } else {
- ktime_get_ts64(&start);
- memcpy_fromio(buf, src_addr, reg->size);
- ktime_get_ts64(&end);
+ pci_epc_mem_unmap(epc, epf->func_no, epf->vfunc_no, &map);
+ map_size = 0;
}

- pci_epf_test_print_rate(epf_test, "READ", reg->size, &start, &end,
- reg->flags & FLAG_USE_DMA);
+ pci_epf_test_print_rate(epf_test, "READ", reg->size, &start,
+ &end, reg->flags & FLAG_USE_DMA);

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

-err_dma_map:
- kfree(buf);
+unmap:
+ if (map_size)
+ pci_epc_mem_unmap(epc, epf->func_no, epf->vfunc_no, &map);

-err_map_addr:
- pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, phys_addr);
+free_buf:
+ kfree(src_buf);

-err_addr:
- pci_epc_mem_free_addr(epc, phys_addr, src_addr, reg->size);
-
-err:
+set_status:
if (!ret)
reg->status |= STATUS_READ_SUCCESS;
else
@@ -496,71 +506,79 @@ static void pci_epf_test_read(struct pci_epf_test *epf_test,
static void pci_epf_test_write(struct pci_epf_test *epf_test,
struct pci_epf_test_reg *reg)
{
- int ret;
- void __iomem *dst_addr;
- void *buf;
- phys_addr_t phys_addr;
+ int ret = 0;
+ void *dst_buf, *buf;
+ struct pci_epc_map map;
phys_addr_t src_phys_addr;
struct timespec64 start, end;
struct pci_epf *epf = epf_test->epf;
- struct device *dev = &epf->dev;
struct pci_epc *epc = epf->epc;
+ struct device *dev = &epf->dev;
struct device *dma_dev = epf->epc->dev.parent;
+ u64 dst_addr = reg->dst_addr;
+ size_t dst_size = reg->size;
+ ssize_t map_size = 0;

- dst_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
- if (!dst_addr) {
- dev_err(dev, "Failed to allocate address\n");
- reg->status = STATUS_DST_ADDR_INVALID;
+ dst_buf = kzalloc(dst_size, GFP_KERNEL);
+ if (!dst_buf) {
ret = -ENOMEM;
- goto err;
+ goto set_status;
}
-
- ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, phys_addr,
- reg->dst_addr, reg->size);
- 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);
- if (!buf) {
- ret = -ENOMEM;
- goto err_map_addr;
- }
-
- get_random_bytes(buf, reg->size);
- reg->checksum = crc32_le(~0, buf, reg->size);
-
- 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)) {
- dev_err(dev, "Failed to map source buffer addr\n");
- ret = -ENOMEM;
- goto err_dma_map;
+ get_random_bytes(dst_buf, dst_size);
+ reg->checksum = crc32_le(~0, dst_buf, dst_size);
+ buf = dst_buf;
+
+ while (dst_size) {
+ map_size = pci_epc_mem_map(epc, epf->func_no, epf->vfunc_no,
+ dst_addr, dst_size, &map);
+ if (map_size < 0) {
+ dev_err(dev, "Failed to map address\n");
+ reg->status = STATUS_DST_ADDR_INVALID;
+ ret = map_size;
+ goto free_buf;
}

- ktime_get_ts64(&start);
+ if (reg->flags & FLAG_USE_DMA) {
+ src_phys_addr = dma_map_single(dma_dev, buf, map_size,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(dma_dev, src_phys_addr)) {
+ dev_err(dev,
+ "Failed to map source buffer addr\n");
+ ret = -ENOMEM;
+ goto unmap;
+ }
+
+ ktime_get_ts64(&start);
+
+ ret = pci_epf_test_data_transfer(epf_test,
+ map.phys_addr, src_phys_addr,
+ map_size, dst_addr,
+ DMA_MEM_TO_DEV);
+ if (ret)
+ dev_err(dev, "Data transfer failed\n");
+ ktime_get_ts64(&end);
+
+ dma_unmap_single(dma_dev, src_phys_addr, map_size,
+ DMA_TO_DEVICE);
+
+ if (ret)
+ goto unmap;
+ } else {
+ ktime_get_ts64(&start);
+ memcpy_toio(map.virt_addr, buf, map_size);
+ ktime_get_ts64(&end);
+ }

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

- dma_unmap_single(dma_dev, src_phys_addr, reg->size,
- DMA_TO_DEVICE);
- } else {
- ktime_get_ts64(&start);
- memcpy_toio(dst_addr, buf, reg->size);
- ktime_get_ts64(&end);
+ pci_epc_mem_unmap(epc, epf->func_no, epf->vfunc_no, &map);
+ map_size = 0;
}

- pci_epf_test_print_rate(epf_test, "WRITE", reg->size, &start, &end,
- reg->flags & FLAG_USE_DMA);
+ pci_epf_test_print_rate(epf_test, "WRITE", reg->size, &start,
+ &end, reg->flags & FLAG_USE_DMA);

/*
* wait 1ms inorder for the write to complete. Without this delay L3
@@ -568,16 +586,14 @@ static void pci_epf_test_write(struct pci_epf_test *epf_test,
*/
usleep_range(1000, 2000);

-err_dma_map:
- kfree(buf);
-
-err_map_addr:
- pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, phys_addr);
+unmap:
+ if (map_size)
+ pci_epc_mem_unmap(epc, epf->func_no, epf->vfunc_no, &map);

-err_addr:
- pci_epc_mem_free_addr(epc, phys_addr, dst_addr, reg->size);
+free_buf:
+ kfree(dst_buf);

-err:
+set_status:
if (!ret)
reg->status |= STATUS_WRITE_SUCCESS;
else
--
2.44.0