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Unverified Commit 8048d151 authored by Martin Sperl's avatar Martin Sperl Committed by Mark Brown
Browse files

spi: bcm2835aux: add driver stats to debugfs 



To estimate efficiency add statistics on transfer types
(polling and interrupt) used to debugfs.

Signed-off-by: default avatarMartin Sperl <kernel@martin.sperl.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent fedd6940

drivers/spi/spi-bcm2835aux.c

+56 −0
Original line number Diff line number Diff line
@@ -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 */