[cip-dev] [RFC PATCH 4.19.y-cip 35/50] PCI: endpoint: functions/pci-epf-test: Print throughput information

Lad Prabhakar
2020-10-12T14:21:05Z

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From: Kishon Vijay Abraham I <kishon@ti.com>

commit 5893c2e5353bb9a723d862d8b6ba8028a8f6a6eb upstream.

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>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Alan Mikhak <alan.mikhak@sifive.com>
[PL: Applied changes to pci-epf-test.c manually, always pass dma variable
to pci_epf_test_print_rate() function as false since streaming DMA support
is missing in EPF]
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
drivers/pci/endpoint/functions/pci-epf-test.c | 44 +++++++++++++++++++
1 file changed, 44 insertions(+)

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index f6905c242194..8d9b5521ed50 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -73,6 +73,36 @@ static struct pci_epf_header test_header = {

static size_t bar_size[] = { 512, 512, 1024, 16384, 131072, 1048576 };

+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;
@@ -80,6 +110,7 @@ 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;
@@ -118,7 +149,10 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
goto err_dst_addr;
}

+ ktime_get_ts64(&start);
memcpy(dst_addr, src_addr, reg->size);
+ ktime_get_ts64(&end);
+ pci_epf_test_print_rate("COPY", reg->size, &start, &end, false);

pci_epc_unmap_addr(epc, epf->func_no, dst_phys_addr);

@@ -142,6 +176,7 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
void *buf;
u32 crc32;
phys_addr_t phys_addr;
+ struct timespec64 start, end;
struct pci_epf *epf = epf_test->epf;
struct device *dev = &epf->dev;
struct pci_epc *epc = epf->epc;
@@ -170,7 +205,11 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
goto err_map_addr;
}

+ 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, false);

crc32 = crc32_le(~0, buf, reg->size);
if (crc32 != reg->checksum)
@@ -194,6 +233,7 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
void __iomem *dst_addr;
void *buf;
phys_addr_t phys_addr;
+ struct timespec64 start, end;
struct pci_epf *epf = epf_test->epf;
struct device *dev = &epf->dev;
struct pci_epc *epc = epf->epc;
@@ -225,7 +265,11 @@ 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);

+ 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, false);

/*
* wait 1ms inorder for the write to complete. Without this delay L3
--
2.17.1

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