diff options
| author | Martin Sperl <kernel@martin.sperl.org> | 2019-03-30 13:13:53 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-04-03 07:32:28 +0300 |
| commit | 8048d151eb4d74d5c533dbe10a846ea0b7495c6b (patch) | |
| tree | d57a70b9ad99915d8d924895fb3a87939f043b1b /drivers/spi/spi-bcm2835aux.c | |
| parent | fedd6940682afeddb22bfd855d8eaf527bcc473a (diff) | |
| download | linux-8048d151eb4d74d5c533dbe10a846ea0b7495c6b.tar.xz | |
spi: bcm2835aux: add driver stats to debugfs
To estimate efficiency add statistics on transfer types
(polling and interrupt) used to debugfs.
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-bcm2835aux.c')
| -rw-r--r-- | drivers/spi/spi-bcm2835aux.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c index 056a8e2892e0..1a11b9131556 100644 --- a/drivers/spi/spi-bcm2835aux.c +++ b/drivers/spi/spi-bcm2835aux.c @@ -21,6 +21,7 @@ #include <linux/clk.h> #include <linux/completion.h> +#include <linux/debugfs.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/interrupt.h> @@ -104,8 +105,52 @@ struct bcm2835aux_spi { int tx_len; int rx_len; int pending; + + u64 count_transfer_polling; + u64 count_transfer_irq; + u64 count_transfer_irq_after_poll; + + struct dentry *debugfs_dir; }; +#if defined(CONFIG_DEBUG_FS) +static void bcm2835aux_debugfs_create(struct bcm2835aux_spi *bs, + const char *dname) +{ + char name[64]; + struct dentry *dir; + + /* get full name */ + snprintf(name, sizeof(name), "spi-bcm2835aux-%s", dname); + + /* the base directory */ + dir = debugfs_create_dir(name, NULL); + bs->debugfs_dir = dir; + + /* the counters */ + debugfs_create_u64("count_transfer_polling", 0444, dir, + &bs->count_transfer_polling); + debugfs_create_u64("count_transfer_irq", 0444, dir, + &bs->count_transfer_irq); + debugfs_create_u64("count_transfer_irq_after_poll", 0444, dir, + &bs->count_transfer_irq_after_poll); +} + +static void bcm2835aux_debugfs_remove(struct bcm2835aux_spi *bs) +{ + debugfs_remove_recursive(bs->debugfs_dir); + bs->debugfs_dir = NULL; +} +#else +static void bcm2835aux_debugfs_create(struct bcm2835aux_spi *bs) +{ +} + +static void bcm2835aux_debugfs_remove(struct bcm2835aux_spi *bs) +{ +} +#endif /* CONFIG_DEBUG_FS */ + static inline u32 bcm2835aux_rd(struct bcm2835aux_spi *bs, unsigned reg) { return readl(bs->regs + reg); @@ -244,6 +289,9 @@ static int bcm2835aux_spi_transfer_one_irq(struct spi_master *master, { struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + /* update statistics */ + bs->count_transfer_irq++; + /* fill in registers and fifos before enabling interrupts */ bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]); bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0, bs->cntl[0]); @@ -267,6 +315,9 @@ static int bcm2835aux_spi_transfer_one_poll(struct spi_master *master, struct bcm2835aux_spi *bs = spi_master_get_devdata(master); unsigned long timeout; + /* update statistics */ + bs->count_transfer_polling++; + /* configure spi */ bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]); bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0, bs->cntl[0]); @@ -287,6 +338,7 @@ static int bcm2835aux_spi_transfer_one_poll(struct spi_master *master, jiffies - timeout, bs->tx_len, bs->rx_len); /* forward to interrupt handler */ + bs->count_transfer_irq_after_poll++; return __bcm2835aux_spi_transfer_one_irq(master, spi, tfr); } @@ -536,6 +588,8 @@ static int bcm2835aux_spi_probe(struct platform_device *pdev) goto out_clk_disable; } + bcm2835aux_debugfs_create(bs, dev_name(&pdev->dev)); + return 0; out_clk_disable: @@ -550,6 +604,8 @@ static int bcm2835aux_spi_remove(struct platform_device *pdev) struct spi_master *master = platform_get_drvdata(pdev); struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + bcm2835aux_debugfs_remove(bs); + bcm2835aux_spi_reset_hw(bs); /* disable the HW block by releasing the clock */ |