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Subject[PATCH v3 2/5] PCI: endpoint: functions/pci-epf-test: Print throughput information
Date
Print throughput information in KB/s after every completed transfer,
including information on whether DMA is used or not.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Tested-by: Alan Mikhak <alan.mikhak@sifive.com>
---
drivers/pci/endpoint/functions/pci-epf-test.c | 48 +++++++++++++++++++
1 file changed, 48 insertions(+)

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index c9d9d1780e66..108e4b40e67a 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -190,6 +190,36 @@ static void pci_epf_test_clean_dma_chan(struct pci_epf_test *epf_test)
epf_test->dma_chan = NULL;
}

+static void pci_epf_test_print_rate(const char *ops, u64 size,
+ struct timespec64 *start,
+ struct timespec64 *end, bool dma)
+{
+ struct timespec64 ts;
+ u64 rate, ns;
+
+ ts = timespec64_sub(*end, *start);
+
+ /* convert both size (stored in 'rate') and time in terms of 'ns' */
+ ns = timespec64_to_ns(&ts);
+ rate = size * NSEC_PER_SEC;
+
+ /* Divide both size (stored in 'rate') and ns by a common factor */
+ while (ns > UINT_MAX) {
+ rate >>= 1;
+ ns >>= 1;
+ }
+
+ if (!ns)
+ return;
+
+ /* 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",
+ (u64)ts.tv_sec, (u32)ts.tv_nsec, rate / 1024);
+}
+
static int pci_epf_test_copy(struct pci_epf_test *epf_test)
{
int ret;
@@ -198,6 +228,7 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
void __iomem *dst_addr;
phys_addr_t src_phys_addr;
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;
@@ -236,6 +267,7 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
goto err_dst_addr;
}

+ ktime_get_ts64(&start);
use_dma = !!(reg->flags & FLAG_USE_DMA);
if (use_dma) {
if (!epf_test->dma_supported) {
@@ -251,6 +283,8 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
} else {
memcpy(dst_addr, src_addr, reg->size);
}
+ ktime_get_ts64(&end);
+ pci_epf_test_print_rate("COPY", reg->size, &start, &end, use_dma);

err_map_addr:
pci_epc_unmap_addr(epc, epf->func_no, dst_phys_addr);
@@ -277,6 +311,7 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
bool use_dma;
phys_addr_t phys_addr;
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;
@@ -322,17 +357,23 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
goto err_dma_map;
}

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

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_epf_test_print_rate("READ", reg->size, &start, &end, use_dma);
+
crc32 = crc32_le(~0, buf, reg->size);
if (crc32 != reg->checksum)
ret = -EIO;
@@ -358,6 +399,7 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
bool use_dma;
phys_addr_t phys_addr;
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;
@@ -406,17 +448,23 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
goto err_dma_map;
}

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

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_epf_test_print_rate("WRITE", reg->size, &start, &end, use_dma);
+
/*
* wait 1ms inorder for the write to complete. Without this delay L3
* error in observed in the host system.
--
2.17.1
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