diff options
Diffstat (limited to 'drivers/mmc/host/dw_mmc.c')
| -rw-r--r-- | drivers/mmc/host/dw_mmc.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index c3229d8c7041..6578cc64ae9e 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -17,9 +17,11 @@ #include <linux/interrupt.h> #include <linux/iopoll.h> #include <linux/ioport.h> +#include <linux/ktime.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/prandom.h> #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/stat.h> @@ -181,6 +183,9 @@ static void dw_mci_init_debugfs(struct dw_mci_slot *slot) &host->pending_events); debugfs_create_xul("completed_events", S_IRUSR, root, &host->completed_events); +#ifdef CONFIG_FAULT_INJECTION + fault_create_debugfs_attr("fail_data_crc", root, &host->fail_data_crc); +#endif } #endif /* defined(CONFIG_DEBUG_FS) */ @@ -782,6 +787,7 @@ static int dw_mci_edmac_start_dma(struct dw_mci *host, int ret = 0; /* Set external dma config: burst size, burst width */ + memset(&cfg, 0, sizeof(cfg)); cfg.dst_addr = host->phy_regs + fifo_offset; cfg.src_addr = cfg.dst_addr; cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; @@ -1788,6 +1794,68 @@ static const struct mmc_host_ops dw_mci_ops = { .prepare_hs400_tuning = dw_mci_prepare_hs400_tuning, }; +#ifdef CONFIG_FAULT_INJECTION +static enum hrtimer_restart dw_mci_fault_timer(struct hrtimer *t) +{ + struct dw_mci *host = container_of(t, struct dw_mci, fault_timer); + unsigned long flags; + + spin_lock_irqsave(&host->irq_lock, flags); + + if (!host->data_status) + host->data_status = SDMMC_INT_DCRC; + set_bit(EVENT_DATA_ERROR, &host->pending_events); + tasklet_schedule(&host->tasklet); + + spin_unlock_irqrestore(&host->irq_lock, flags); + + return HRTIMER_NORESTART; +} + +static void dw_mci_start_fault_timer(struct dw_mci *host) +{ + struct mmc_data *data = host->data; + + if (!data || data->blocks <= 1) + return; + + if (!should_fail(&host->fail_data_crc, 1)) + return; + + /* + * Try to inject the error at random points during the data transfer. + */ + hrtimer_start(&host->fault_timer, + ms_to_ktime(prandom_u32() % 25), + HRTIMER_MODE_REL); +} + +static void dw_mci_stop_fault_timer(struct dw_mci *host) +{ + hrtimer_cancel(&host->fault_timer); +} + +static void dw_mci_init_fault(struct dw_mci *host) +{ + host->fail_data_crc = (struct fault_attr) FAULT_ATTR_INITIALIZER; + + hrtimer_init(&host->fault_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + host->fault_timer.function = dw_mci_fault_timer; +} +#else +static void dw_mci_init_fault(struct dw_mci *host) +{ +} + +static void dw_mci_start_fault_timer(struct dw_mci *host) +{ +} + +static void dw_mci_stop_fault_timer(struct dw_mci *host) +{ +} +#endif + static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq) __releases(&host->lock) __acquires(&host->lock) @@ -2102,6 +2170,7 @@ static void dw_mci_tasklet_func(struct tasklet_struct *t) break; } + dw_mci_stop_fault_timer(host); host->data = NULL; set_bit(EVENT_DATA_COMPLETE, &host->completed_events); err = dw_mci_data_complete(host, data); @@ -2151,6 +2220,7 @@ static void dw_mci_tasklet_func(struct tasklet_struct *t) if (mrq->cmd->error && mrq->data) dw_mci_reset(host); + dw_mci_stop_fault_timer(host); host->cmd = NULL; host->data = NULL; @@ -2600,6 +2670,8 @@ static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status) set_bit(EVENT_CMD_COMPLETE, &host->pending_events); tasklet_schedule(&host->tasklet); + + dw_mci_start_fault_timer(host); } static void dw_mci_handle_cd(struct dw_mci *host) @@ -3223,6 +3295,8 @@ int dw_mci_probe(struct dw_mci *host) spin_lock_init(&host->irq_lock); INIT_LIST_HEAD(&host->queue); + dw_mci_init_fault(host); + /* * Get the host data width - this assumes that HCON has been set with * the correct values. |