2015-02-23 17:08 GMT+09:00 Gilad Broner <gbroner@xxxxxxxxxxxxxx>:
> From: Lee Susman <lsusman@xxxxxxxxxxxxxx>
>
> Adding debugfs capability for ufshcd.
>
> debugfs attributes introduced in this patch:
> - View driver/controller runtime data
> - Command tag statistics for performance analisis
> - Dump device descriptor info
> - Track recoverable errors statistics during runtime
> - Change UFS power mode during runtime
> entry a string in the format 'GGLLMM' where:
> G - selected gear
> L - number of lanes
> M - power mode
> (1=fast mode, 2=slow mode, 4=fast-auto mode,
> 5=slow-auto mode)
> First letter is for RX, second is for TX.
> - Get/set DME attributes
I have a few nitpick comments on this patch.
> +#ifdef CONFIG_DEBUG_FS
> +
> +#define UFSHCD_UPDATE_ERROR_STATS(hba, type) \
> + do { \
> + if (type < UFS_ERR_MAX) \
> + hba->ufs_stats.err_stats[type]++; \
> + } while (0)
> +
> +#define UFSHCD_UPDATE_TAG_STATS(hba, tag) \
> + do { \
> + struct request *rq = hba->lrb[task_tag].cmd ? \
> + hba->lrb[task_tag].cmd->request : NULL; \
> + u64 **tag_stats = hba->ufs_stats.tag_stats; \
> + int rq_type = -1; \
> + if (!hba->ufs_stats.enabled) \
> + break; \
> + tag_stats[tag][TS_TAG]++; \
> + if (!rq) \
> + break; \
> + WARN_ON(hba->ufs_stats.q_depth > hba->nutrs); \
> + if (rq_data_dir(rq) == READ) \
> + rq_type = TS_READ; \
> + else if (rq_data_dir(rq) == WRITE) \
> + rq_type = TS_WRITE; \
> + else if (rq->cmd_flags & REQ_FLUSH) \
> + rq_type = TS_FLUSH; \
> + else \
> + break; \
> + tag_stats[hba->ufs_stats.q_depth++][rq_type]++; \
> + } while (0)
> +
> +#define UFSHCD_UPDATE_TAG_STATS_COMPLETION(hba, cmd) \
> + do { \
> + struct request *rq = cmd ? cmd->request : NULL; \
> + if (cmd->request && \
> + ((rq_data_dir(rq) == READ) || \
> + (rq_data_dir(rq) == WRITE) || \
> + (rq->cmd_flags & REQ_FLUSH))) \
> + hba->ufs_stats.q_depth--; \
> + } while (0)
> +
> +#else
> +#define UFSHCD_UPDATE_TAG_STATS(hba, tag)
> +#define UFSHCD_UPDATE_TAG_STATS_COMPLETION(hba, cmd)
> +#define UFSHCD_UPDATE_ERROR_STATS(hba, type)
> +
> +#endif
Is there any reason that these are defined as macros instead of
static functions?
> @@ -5760,6 +5958,8 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
>
> async_schedule(ufshcd_async_scan, hba);
>
> + ufsdbg_add_debugfs(hba);
> +
> return 0;
>
> out_remove_scsi_host:
> @@ -5769,6 +5969,7 @@ exit_gating:
> out_disable:
> hba->is_irq_enabled = false;
> scsi_host_put(host);
> + ufsdbg_remove_debugfs(hba);
> ufshcd_hba_exit(hba);
> out_error:
> return err;
This ufsdbg_remove_debugfs() call on error path of ufshcd_init() is
unnecessary. Because ufsdbg_add_debugfs() is called at the last of
ufshcd_init() and can't fail.
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