Applied "spi: spidev_test: add option to continuously transfer data" to the spi tree

[Mark Brown <broonie@xxxxxxxxxx>]

The patch

   spi: spidev_test: add option to continuously transfer data

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 9006a7b3220e7293ef8bc1ac9bba6c54411051c1 Mon Sep 17 00:00:00 2001
From: Frode Isaksen <fisaksen@xxxxxxxxxxxx>
Date: Tue, 21 Mar 2017 16:48:46 +0100
Subject: [PATCH] spi: spidev_test: add option to continuously transfer data

Add option to send+recv <size> bytes with <iter> iterations
and show the transfer rate every 5 seconds.
Example:
rate: tx 4235.2kbps, rx 4235.2kbps
total: tx 4882.8KB, rx 4882.8KB

Signed-off-by: Frode Isaksen <fisaksen@xxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
 tools/spi/spidev_test.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 88 insertions(+), 5 deletions(-)

diff --git a/tools/spi/spidev_test.c b/tools/spi/spidev_test.c
index 816f119c9b7b..8c590cd1171a 100644
--- a/tools/spi/spidev_test.c
+++ b/tools/spi/spidev_test.c
@@ -18,6 +18,7 @@
 #include <string.h>
 #include <getopt.h>
 #include <fcntl.h>
+#include <time.h>
 #include <sys/ioctl.h>
 #include <linux/ioctl.h>
 #include <sys/stat.h>
@@ -40,6 +41,9 @@ static char *output_file;
 static uint32_t speed = 500000;
 static uint16_t delay;
 static int verbose;
+static int transfer_size;
+static int iterations;
+static int interval = 5; /* interval in seconds for showing transfer rate */
 
 uint8_t default_tx[] = {
 	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
@@ -156,13 +160,13 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
 		close(out_fd);
 	}
 
-	if (verbose || !output_file)
+	if (verbose)
 		hex_dump(rx, len, 32, "RX");
 }
 
 static void print_usage(const char *prog)
 {
-	printf("Usage: %s [-DsbdlHOLC3]\n", prog);
+	printf("Usage: %s [-DsbdlHOLC3vpNR24SI]\n", prog);
 	puts("  -D --device   device to use (default /dev/spidev1.1)\n"
 	     "  -s --speed    max speed (Hz)\n"
 	     "  -d --delay    delay (usec)\n"
@@ -180,7 +184,9 @@ static void print_usage(const char *prog)
 	     "  -N --no-cs    no chip select\n"
 	     "  -R --ready    slave pulls low to pause\n"
 	     "  -2 --dual     dual transfer\n"
-	     "  -4 --quad     quad transfer\n");
+	     "  -4 --quad     quad transfer\n"
+	     "  -S --size     transfer size\n"
+	     "  -I --iter     iterations\n");
 	exit(1);
 }
 
@@ -205,11 +211,13 @@ static void parse_opts(int argc, char *argv[])
 			{ "dual",    0, 0, '2' },
 			{ "verbose", 0, 0, 'v' },
 			{ "quad",    0, 0, '4' },
+			{ "size",    1, 0, 'S' },
+			{ "iter",    1, 0, 'I' },
 			{ NULL, 0, 0, 0 },
 		};
 		int c;
 
-		c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3NR24p:v",
+		c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3NR24p:vS:I:",
 				lopts, NULL);
 
 		if (c == -1)
@@ -270,6 +278,12 @@ static void parse_opts(int argc, char *argv[])
 		case '4':
 			mode |= SPI_TX_QUAD;
 			break;
+		case 'S':
+			transfer_size = atoi(optarg);
+			break;
+		case 'I':
+			iterations = atoi(optarg);
+			break;
 		default:
 			print_usage(argv[0]);
 			break;
@@ -336,6 +350,57 @@ static void transfer_file(int fd, char *filename)
 	close(tx_fd);
 }
 
+static uint64_t _read_count;
+static uint64_t _write_count;
+
+static void show_transfer_rate(void)
+{
+	static uint64_t prev_read_count, prev_write_count;
+	double rx_rate, tx_rate;
+
+	rx_rate = ((_read_count - prev_read_count) * 8) / (interval*1000.0);
+	tx_rate = ((_write_count - prev_write_count) * 8) / (interval*1000.0);
+
+	printf("rate: tx %.1fkbps, rx %.1fkbps\n", rx_rate, tx_rate);
+
+	prev_read_count = _read_count;
+	prev_write_count = _write_count;
+}
+
+static void transfer_buf(int fd, int len)
+{
+	uint8_t *tx;
+	uint8_t *rx;
+	int i;
+
+	tx = malloc(len);
+	if (!tx)
+		pabort("can't allocate tx buffer");
+	for (i = 0; i < len; i++)
+		tx[i] = random();
+
+	rx = malloc(len);
+	if (!rx)
+		pabort("can't allocate rx buffer");
+
+	transfer(fd, tx, rx, len);
+
+	_write_count += len;
+	_read_count += len;
+
+	if (mode & SPI_LOOP) {
+		if (memcmp(tx, rx, len)) {
+			fprintf(stderr, "transfer error !\n");
+			hex_dump(tx, len, 32, "TX");
+			hex_dump(rx, len, 32, "RX");
+			exit(1);
+		}
+	}
+
+	free(rx);
+	free(tx);
+}
+
 int main(int argc, char *argv[])
 {
 	int ret = 0;
@@ -391,7 +456,25 @@ int main(int argc, char *argv[])
 		transfer_escaped_string(fd, input_tx);
 	else if (input_file)
 		transfer_file(fd, input_file);
-	else
+	else if (transfer_size) {
+		struct timespec last_stat;
+
+		clock_gettime(CLOCK_MONOTONIC, &last_stat);
+
+		while (iterations-- > 0) {
+			struct timespec current;
+
+			transfer_buf(fd, transfer_size);
+
+			clock_gettime(CLOCK_MONOTONIC, &current);
+			if (current.tv_sec - last_stat.tv_sec > interval) {
+				show_transfer_rate();
+				last_stat = current;
+			}
+		}
+		printf("total: tx %.1fKB, rx %.1fKB\n",
+		       _write_count/1024.0, _read_count/1024.0);
+	} else
 		transfer(fd, default_tx, default_rx, sizeof(default_tx));
 
 	close(fd);
-- 
2.11.0

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