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Message-Id: <1482460782-5971-1-git-send-email-subhashj@codeaurora.org>
Date: Thu, 22 Dec 2016 18:39:42 -0800
From: Subhash Jadavani <subhashj@...eaurora.org>
To: vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
martin.petersen@...cle.com
Cc: linux-scsi@...r.kernel.org, Dolev Raviv <draviv@...eaurora.org>,
Subhash Jadavani <subhashj@...eaurora.org>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 01/12] scsi: ufs: dump debug info during failures
From: Dolev Raviv <draviv@...eaurora.org>
Inserts driver dumps for UFS Host Controller registers, Transfer Requests
and Task Management Requests.
The dumps will occur on driver initialization failure, ufshcd_abort() and
on error handling path.
Signed-off-by: Dolev Raviv <draviv@...eaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
---
Changes from v1 -> v2:
- Added explicit new line character at the end of the printk messages.
- Fixed couple of checkpatch warnings.
---
drivers/scsi/ufs/ufshcd.c | 129 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/scsi/ufs/ufshci.h | 3 ++
2 files changed, 132 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index af7e028..fe516b2 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -94,6 +94,9 @@
_ret; \
})
+#define ufshcd_hex_dump(prefix_str, buf, len) \
+print_hex_dump(KERN_ERR, prefix_str, DUMP_PREFIX_OFFSET, 16, 4, buf, len, false)
+
static u32 ufs_query_desc_max_size[] = {
QUERY_DESC_DEVICE_MAX_SIZE,
QUERY_DESC_CONFIGURAION_MAX_SIZE,
@@ -267,6 +270,77 @@ static inline void ufshcd_remove_non_printable(char *val)
*val = ' ';
}
+static void ufshcd_print_host_regs(struct ufs_hba *hba)
+{
+ /*
+ * hex_dump reads its data without the readl macro. This might
+ * cause inconsistency issues on some platform, as the printed
+ * values may be from cache and not the most recent value.
+ * To know whether you are looking at an un-cached version verify
+ * that IORESOURCE_MEM flag is on when xxx_get_resource() is invoked
+ * during platform/pci probe function.
+ */
+ ufshcd_hex_dump("host regs: ", hba->mmio_base, UFSHCI_REG_SPACE_SIZE);
+ 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);
+}
+
+static
+void ufshcd_print_trs(struct ufs_hba *hba, unsigned long bitmap, bool pr_prdt)
+{
+ struct ufshcd_lrb *lrbp;
+ int tag;
+
+ for_each_set_bit(tag, &bitmap, hba->nutrs) {
+ lrbp = &hba->lrb[tag];
+
+ dev_err(hba->dev, "UPIU[%d] - Transfer Request Descriptor\n",
+ tag);
+ ufshcd_hex_dump("UPIU TRD: ", lrbp->utr_descriptor_ptr,
+ sizeof(struct utp_transfer_req_desc));
+ dev_err(hba->dev, "UPIU[%d] - Request UPIU\n", tag);
+ ufshcd_hex_dump("UPIU REQ: ", lrbp->ucd_req_ptr,
+ sizeof(struct utp_upiu_req));
+ dev_err(hba->dev, "UPIU[%d] - Response UPIU\n", tag);
+ ufshcd_hex_dump("UPIU RSP: ", lrbp->ucd_rsp_ptr,
+ sizeof(struct utp_upiu_rsp));
+ if (pr_prdt) {
+ int prdt_length = le16_to_cpu(
+ lrbp->utr_descriptor_ptr->prd_table_length);
+
+ dev_err(hba->dev, "UPIU[%d] - PRDT - %d entries\n", tag,
+ prdt_length);
+ ufshcd_hex_dump("UPIU PRDT: ", lrbp->ucd_prdt_ptr,
+ sizeof(struct ufshcd_sg_entry) *
+ prdt_length);
+ }
+ }
+}
+
+static void ufshcd_print_tmrs(struct ufs_hba *hba, unsigned long bitmap)
+{
+ struct utp_task_req_desc *tmrdp;
+ int tag;
+
+ for_each_set_bit(tag, &bitmap, hba->nutmrs) {
+ tmrdp = &hba->utmrdl_base_addr[tag];
+ dev_err(hba->dev, "TM[%d] - Task Management Header\n", tag);
+ ufshcd_hex_dump("TM TRD: ", &tmrdp->header,
+ sizeof(struct request_desc_header));
+ dev_err(hba->dev, "TM[%d] - Task Management Request UPIU\n",
+ tag);
+ ufshcd_hex_dump("TM REQ: ", tmrdp->task_req_upiu,
+ sizeof(struct utp_upiu_req));
+ dev_err(hba->dev, "TM[%d] - Task Management Response UPIU\n",
+ tag);
+ ufshcd_hex_dump("TM RSP: ", tmrdp->task_rsp_upiu,
+ sizeof(struct utp_task_req_desc));
+ }
+}
+
/*
* ufshcd_wait_for_register - wait for register value to change
* @hba - per-adapter interface
@@ -2392,6 +2466,32 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
}
/**
+ * ufshcd_print_pwr_info - print power params as saved in hba
+ * power info
+ * @hba: per-adapter instance
+ */
+static void ufshcd_print_pwr_info(struct ufs_hba *hba)
+{
+ static const char * const names[] = {
+ "INVALID MODE",
+ "FAST MODE",
+ "SLOW_MODE",
+ "INVALID MODE",
+ "FASTAUTO_MODE",
+ "SLOWAUTO_MODE",
+ "INVALID MODE",
+ };
+
+ dev_info(hba->dev, "%s:[RX, TX]: gear=[%d, %d], lane[%d, %d], pwr[%s, %s], rate = %d\n",
+ __func__,
+ hba->pwr_info.gear_rx, hba->pwr_info.gear_tx,
+ hba->pwr_info.lane_rx, hba->pwr_info.lane_tx,
+ names[hba->pwr_info.pwr_rx],
+ names[hba->pwr_info.pwr_tx],
+ hba->pwr_info.hs_rate);
+}
+
+/**
* ufshcd_host_memory_configure - configure local reference block with
* memory offsets
* @hba: per adapter instance
@@ -2973,6 +3073,8 @@ static int ufshcd_change_power_mode(struct ufs_hba *hba,
sizeof(struct ufs_pa_layer_attr));
}
+ ufshcd_print_pwr_info(hba);
+
return ret;
}
@@ -3656,6 +3758,8 @@ static int ufshcd_task_req_compl(struct ufs_hba *hba, u32 index, u8 *resp)
break;
} /* end of switch */
+ if (host_byte(result) != DID_OK)
+ ufshcd_print_trs(hba, 1 << lrbp->task_tag, true);
return result;
}
@@ -4327,6 +4431,22 @@ static void ufshcd_check_errors(struct ufs_hba *hba)
scsi_block_requests(hba->host);
hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED;
+
+ /* dump controller state before resetting */
+ if (hba->saved_err & (INT_FATAL_ERRORS | UIC_ERROR)) {
+ bool pr_prdt = !!(hba->saved_err &
+ SYSTEM_BUS_FATAL_ERROR);
+
+ dev_err(hba->dev, "%s: saved_err 0x%x saved_uic_err 0x%x\n",
+ __func__, hba->saved_err,
+ hba->saved_uic_err);
+
+ ufshcd_print_host_regs(hba);
+ ufshcd_print_pwr_info(hba);
+ ufshcd_print_tmrs(hba, hba->outstanding_tasks);
+ ufshcd_print_trs(hba, hba->outstanding_reqs,
+ pr_prdt);
+ }
schedule_work(&hba->eh_work);
}
}
@@ -4617,6 +4737,13 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
__func__, tag);
}
+ /* Print Transfer Request of aborted task */
+ dev_err(hba->dev, "%s: Device abort task at tag %d\n", __func__, tag);
+ scsi_print_command(hba->lrb[tag].cmd);
+ ufshcd_print_host_regs(hba);
+ ufshcd_print_pwr_info(hba);
+ ufshcd_print_trs(hba, 1 << tag, true);
+
lrbp = &hba->lrb[tag];
for (poll_cnt = 100; poll_cnt; poll_cnt--) {
err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
@@ -5256,6 +5383,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
goto out;
ufshcd_init_pwr_info(hba);
+ ufshcd_print_pwr_info(hba);
/* set the default level for urgent bkops */
hba->urgent_bkops_lvl = BKOPS_STATUS_PERF_IMPACT;
@@ -6795,6 +6923,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
err = ufshcd_hba_enable(hba);
if (err) {
dev_err(hba->dev, "Host controller enable failed\n");
+ ufshcd_print_host_regs(hba);
goto out_remove_scsi_host;
}
diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h
index 8c5190e..d14e9b9 100644
--- a/drivers/scsi/ufs/ufshci.h
+++ b/drivers/scsi/ufs/ufshci.h
@@ -72,6 +72,9 @@ enum {
REG_UIC_COMMAND_ARG_1 = 0x94,
REG_UIC_COMMAND_ARG_2 = 0x98,
REG_UIC_COMMAND_ARG_3 = 0x9C,
+
+ UFSHCI_REG_SPACE_SIZE = 0xA0,
+
REG_UFS_CCAP = 0x100,
REG_UFS_CRYPTOCAP = 0x104,
--
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