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spi: add transfer histogram statistics via sysfs

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report transfer sizes as a histogram via the following files:
  /sys/class/spi_master/spi*/statistics/transfer_bytes_histo_*
  /sys/class/spi_master/spi*/spi*.*/statistics/transfer_bytes_histo_*

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Martin Sperl 2015-06-22 13:02:04 +00:00 • committed by Mark Brown
parent 6ff33f3902
commit 6b7bc0618f
2 changed files with 65 additions and 0 deletions
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4
include/linux/spi/spi.h
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@ -51,6 +51,8 @@ extern struct bus_type spi_bus_type;
* @bytes_tx: number of bytes sent to device
* @bytes_rx: number of bytes received from device
*
* @transfer_bytes_histo:
* transfer bytes histogramm
*/
struct spi_statistics {
spinlock_t lock; /* lock for the whole structure */
@ -68,6 +70,8 @@ struct spi_statistics {
unsigned long long bytes_rx;
unsigned long long bytes_tx;
#define SPI_STATISTICS_HISTO_SIZE 17
unsigned long transfer_bytes_histo[SPI_STATISTICS_HISTO_SIZE];
};
void spi_statistics_add_transfer_stats(struct spi_statistics *stats,