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Date: Tue, 28 Jul 2020 11:01:40 -0700
From: "Asutosh Das (asd)" <asutoshd@...eaurora.org>
To: Can Guo <cang@...eaurora.org>, nguyenb@...eaurora.org,
hongwus@...eaurora.org, rnayak@...eaurora.org,
sh425.lee@...sung.com, linux-scsi@...r.kernel.org,
kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com
Cc: Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Stanley Chu <stanley.chu@...iatek.com>,
Bean Huo <beanhuo@...ron.com>,
Bart Van Assche <bvanassche@....org>,
Satya Tangirala <satyat@...gle.com>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 4/8] scsi: ufs: Add some debug infos to
ufshcd_print_host_state
On 7/27/2020 10:00 PM, Can Guo wrote:
> The infos of the last interrupt status and its timestamp are very helpful
> when debug system stability issues, e.g. IRQ starvation, so add them to
> ufshcd_print_host_state. Meanwhile, UFS device infos like model name and
> its FW version also come in handy during debug. In addition, this change
> makes cleanup to some prints in ufshcd_print_host_regs as similar prints
> are already available in ufshcd_print_host_state.
>
> Signed-off-by: Can Guo <cang@...eaurora.org>
> Reviewed-by: Avri Altman <avri.altman@....com>
Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>
> ---
> drivers/scsi/ufs/ufshcd.c | 31 ++++++++++++++++++-------------
> drivers/scsi/ufs/ufshcd.h | 5 +++++
> 2 files changed, 23 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 99bd3e4..eda4dc6 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -411,15 +411,6 @@ static void ufshcd_print_err_hist(struct ufs_hba *hba,
> static void ufshcd_print_host_regs(struct ufs_hba *hba)
> {
> ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: ");
> - dev_err(hba->dev, "hba->ufs_version = 0x%x, hba->capabilities = 0x%x\n",
> - hba->ufs_version, hba->capabilities);
> - dev_err(hba->dev,
> - "hba->outstanding_reqs = 0x%x, hba->outstanding_tasks = 0x%x\n",
> - (u32)hba->outstanding_reqs, (u32)hba->outstanding_tasks);
> - dev_err(hba->dev,
> - "last_hibern8_exit_tstamp at %lld us, hibern8_exit_cnt = %d\n",
> - ktime_to_us(hba->ufs_stats.last_hibern8_exit_tstamp),
> - hba->ufs_stats.hibern8_exit_cnt);
>
> ufshcd_print_err_hist(hba, &hba->ufs_stats.pa_err, "pa_err");
> ufshcd_print_err_hist(hba, &hba->ufs_stats.dl_err, "dl_err");
> @@ -438,8 +429,6 @@ static void ufshcd_print_host_regs(struct ufs_hba *hba)
> ufshcd_print_err_hist(hba, &hba->ufs_stats.host_reset, "host_reset");
> ufshcd_print_err_hist(hba, &hba->ufs_stats.task_abort, "task_abort");
>
> - ufshcd_print_clk_freqs(hba);
> -
> ufshcd_vops_dbg_register_dump(hba);
> }
>
> @@ -499,6 +488,8 @@ static void ufshcd_print_tmrs(struct ufs_hba *hba, unsigned long bitmap)
>
> static void ufshcd_print_host_state(struct ufs_hba *hba)
> {
> + struct scsi_device *sdev_ufs = hba->sdev_ufs_device;
> +
> dev_err(hba->dev, "UFS Host state=%d\n", hba->ufshcd_state);
> dev_err(hba->dev, "outstanding reqs=0x%lx tasks=0x%lx\n",
> hba->outstanding_reqs, hba->outstanding_tasks);
> @@ -511,12 +502,24 @@ static void ufshcd_print_host_state(struct ufs_hba *hba)
> dev_err(hba->dev, "Auto BKOPS=%d, Host self-block=%d\n",
> hba->auto_bkops_enabled, hba->host->host_self_blocked);
> dev_err(hba->dev, "Clk gate=%d\n", hba->clk_gating.state);
> + dev_err(hba->dev,
> + "last_hibern8_exit_tstamp at %lld us, hibern8_exit_cnt=%d\n",
> + ktime_to_us(hba->ufs_stats.last_hibern8_exit_tstamp),
> + hba->ufs_stats.hibern8_exit_cnt);
> + dev_err(hba->dev, "last intr at %lld us, last intr status=0x%x\n",
> + ktime_to_us(hba->ufs_stats.last_intr_ts),
> + hba->ufs_stats.last_intr_status);
> dev_err(hba->dev, "error handling flags=0x%x, req. abort count=%d\n",
> hba->eh_flags, hba->req_abort_count);
> - dev_err(hba->dev, "Host capabilities=0x%x, caps=0x%x\n",
> - hba->capabilities, hba->caps);
> + dev_err(hba->dev, "hba->ufs_version=0x%x, Host capabilities=0x%x, caps=0x%x\n",
> + hba->ufs_version, hba->capabilities, hba->caps);
> dev_err(hba->dev, "quirks=0x%x, dev. quirks=0x%x\n", hba->quirks,
> hba->dev_quirks);
> + if (sdev_ufs)
> + dev_err(hba->dev, "UFS dev info: %.8s %.16s rev %.4s\n",
> + sdev_ufs->vendor, sdev_ufs->model, sdev_ufs->rev);
> +
> + ufshcd_print_clk_freqs(hba);
> }
>
> /**
> @@ -5951,6 +5954,8 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba)
>
> spin_lock(hba->host->host_lock);
> intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
> + hba->ufs_stats.last_intr_status = intr_status;
> + hba->ufs_stats.last_intr_ts = ktime_get();
>
> /*
> * There could be max of hba->nutrs reqs in flight and in worst case
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 656c069..5b2cdaf 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -406,6 +406,8 @@ struct ufs_err_reg_hist {
>
> /**
> * struct ufs_stats - keeps usage/err statistics
> + * @last_intr_status: record the last interrupt status.
> + * @last_intr_ts: record the last interrupt timestamp.
> * @hibern8_exit_cnt: Counter to keep track of number of exits,
> * reset this after link-startup.
> * @last_hibern8_exit_tstamp: Set time after the hibern8 exit.
> @@ -425,6 +427,9 @@ struct ufs_err_reg_hist {
> * @tsk_abort: tracks task abort events
> */
> struct ufs_stats {
> + u32 last_intr_status;
> + ktime_t last_intr_ts;
> +
> u32 hibern8_exit_cnt;
> ktime_t last_hibern8_exit_tstamp;
>
>
--
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