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 per.forlin@linaro.org --- drivers/mmc/core/core.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ drivers/mmc/core/debugfs.c | 26 +++++++++++++++++++++++++ include/linux/mmc/host.h | 7 ++++++ lib/Kconfig.debug | 11 ++++++++++ 4 files changed, 89 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index f091b43..c9195b0 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -24,6 +24,11 @@ #include <linux/regulator/consumer.h> #include <linux/pm_runtime.h>
+#ifdef CONFIG_FAIL_MMC_REQUEST +#include <linux/fault-inject.h> +#include <linux/random.h> +#endif + #include <linux/mmc/card.h> #include <linux/mmc/host.h> #include <linux/mmc/mmc.h> @@ -82,6 +87,44 @@ static void mmc_flush_scheduled_work(void) flush_workqueue(workqueue); }
+#ifdef CONFIG_FAIL_MMC_REQUEST + +/* + * Internal function. Inject random data errors. + * If mmc_data is NULL no errors are injected. + */ +static void mmc_should_fail_request(struct mmc_host *host, + struct mmc_request *mrq) +{ + struct mmc_command *cmd = mrq->cmd; + struct mmc_data *data = mrq->data; + static const int data_errors[] = { + -ETIMEDOUT, + -EILSEQ, + -EIO, + }; + + if (!data) + return; + + if (cmd->error || data->error || !host->make_it_fail || + !should_fail(&host->fail_mmc_request, data->blksz * data->blocks)) + return; + + data->error = data_errors[random32() % ARRAY_SIZE(data_errors)]; + data->bytes_xfered = (random32() % (data->bytes_xfered >> 9)) << 9; +} + +#else /* CONFIG_FAIL_MMC_REQUEST */ + +static void mmc_should_fail_request(struct mmc_host *host, + struct mmc_request *mrq) +{ +} + +#endif /* CONFIG_FAIL_MMC_REQUEST */ + + /** * mmc_request_done - finish processing an MMC request * @host: MMC host which completed request @@ -108,6 +151,8 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) cmd->error = 0; host->ops->request(host, mrq); } else { + mmc_should_fail_request(host, mrq); + led_trigger_event(host->led, LED_OFF);
pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c index 998797e..5f885a4 100644 --- a/drivers/mmc/core/debugfs.c +++ b/drivers/mmc/core/debugfs.c @@ -12,6 +12,9 @@ #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/stat.h> +#ifdef CONFIG_FAIL_MMC_REQUEST +#include <linux/fault-inject.h> +#endif
#include <linux/mmc/card.h> #include <linux/mmc/host.h> @@ -158,6 +161,20 @@ static int mmc_clock_opt_set(void *data, u64 val) return 0; }
+#ifdef CONFIG_FAIL_MMC_REQUEST + +static DECLARE_FAULT_ATTR(fail_mmc_request); +/* + * 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 + DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, "%llu\n");
@@ -188,6 +205,15 @@ void mmc_add_host_debugfs(struct mmc_host *host) root, &host->clk_delay)) goto err_node; #endif +#ifdef CONFIG_FAIL_MMC_REQUEST + if (!debugfs_create_u8("make-it-fail", S_IRUSR | S_IWUSR, + root, &host->make_it_fail)) + goto err_node; + host->fail_mmc_request = fail_mmc_request; + if (init_fault_attr_dentries(&host->fail_mmc_request, + "fail_mmc_request")) + goto err_node; +#endif return;
err_node: diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 0f83858..3b57f4b 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -12,6 +12,9 @@
#include <linux/leds.h> #include <linux/sched.h> +#ifdef CONFIG_FAIL_MMC_REQUEST +#include <linux/fault-inject.h> +#endif
#include <linux/mmc/core.h> #include <linux/mmc/pm.h> @@ -304,6 +307,10 @@ struct mmc_host {
struct mmc_async_req *areq; /* active async req */
+#ifdef CONFIG_FAIL_MMC_REQUEST + u8 make_it_fail; + struct fault_attr fail_mmc_request; +#endif unsigned long private[0] ____cacheline_aligned; };
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index dd373c8..e29e36d 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1067,6 +1067,17 @@ config FAIL_IO_TIMEOUT Only works with drivers that use the generic timeout handling, for others it wont do anything.
+config FAIL_MMC_REQUEST + bool "Fault-injection capability for MMC IO" + select DEBUG_FS + depends on FAULT_INJECTION && MMC + help + Provide fault-injection capability for MMC IO. + This will make the mmc core return data errors. This is + useful to test the error handling in the mmc block device + and to test how the mmc host driver handles retries from + the block device. + config FAULT_INJECTION_DEBUG_FS bool "Debugfs entries for fault-injection capabilities" depends on FAULT_INJECTION && SYSFS && DEBUG_FS