From 1b676f70c108cda90cf9d114d16c677584400efc Mon Sep 17 00:00:00 2001 From: Per Forlin Date: Fri, 19 Aug 2011 14:52:37 +0200 Subject: mmc: core: add random fault injection This adds support to inject data errors after a completed host transfer. The mmc core will return error even though the host transfer is successful. This simple fault injection proved to be very useful to test the non-blocking error handling in the mmc_blk_issue_rw_rq(). Random faults can also test how the host driver handles pre_req() and post_req() in case of errors. Signed-off-by: Per Forlin Acked-by: Akinobu Mita Reviewed-by: Linus Walleij Signed-off-by: Chris Ball --- drivers/mmc/core/debugfs.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'drivers/mmc/core/debugfs.c') diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c index 998797ed67a6..5acd707699c9 100644 --- a/drivers/mmc/core/debugfs.c +++ b/drivers/mmc/core/debugfs.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include @@ -158,6 +159,23 @@ static int mmc_clock_opt_set(void *data, u64 val) return 0; } +#ifdef CONFIG_FAIL_MMC_REQUEST + +static DECLARE_FAULT_ATTR(fail_mmc_request); + +#ifdef KERNEL +/* + * Internal function. Pass the boot param fail_mmc_request to + * the setup fault injection attributes routine. + */ +static int __init setup_fail_mmc_request(char *str) +{ + return setup_fault_attr(&fail_mmc_request, str); +} +__setup("fail_mmc_request=", setup_fail_mmc_request); +#endif /* KERNEL */ +#endif /* CONFIG_FAIL_MMC_REQUEST */ + DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, "%llu\n"); @@ -187,6 +205,13 @@ void mmc_add_host_debugfs(struct mmc_host *host) if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR), root, &host->clk_delay)) goto err_node; +#endif +#ifdef CONFIG_FAIL_MMC_REQUEST + host->fail_mmc_request = fail_mmc_request; + if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request", + root, + &host->fail_mmc_request))) + goto err_node; #endif return; -- cgit