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* [PATCH 2/8] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config
       [not found] <1596204478-5420-1-git-send-email-cang@codeaurora.org>
@ 2020-07-31 14:07 ` Can Guo
  2020-07-31 14:07 ` [PATCH 3/8] scsi: ufs-qcom: Remove testbus dump in ufs_qcom_dump_dbg_regs Can Guo
  1 sibling, 0 replies; 3+ messages in thread
From: Can Guo @ 2020-07-31 14:07 UTC (permalink / raw)
  To: asutoshd, nguyenb, hongwus, rnayak, linux-scsi, kernel-team,
	saravanak, salyzyn, cang
  Cc: Andy Gross, Bjorn Andersson, Alim Akhtar, Avri Altman,
	James E.J. Bottomley, Martin K. Petersen,
	open list:ARM/QUALCOMM SUPPORT, open list

If ufs_qcom_dump_dbg_regs() calls ufs_qcom_testbus_config() from
ufshcd_suspend/resume and/or clk gate/ungate context, pm_runtime_get_sync()
and ufshcd_hold() will cause racing problems. Fix this by removing the
unnecessary calls of pm_runtime_get_sync() and ufshcd_hold().

Signed-off-by: Can Guo <cang@codeaurora.org>
Reviewed-by: Hongwu Su <hongwus@codeaurora.org>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 2e6ddb5..7da27ee 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1604,9 +1604,6 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host)
 	 */
 	}
 	mask <<= offset;
-
-	pm_runtime_get_sync(host->hba->dev);
-	ufshcd_hold(host->hba, false);
 	ufshcd_rmwl(host->hba, TEST_BUS_SEL,
 		    (u32)host->testbus.select_major << 19,
 		    REG_UFS_CFG1);
@@ -1619,8 +1616,6 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host)
 	 * committed before returning.
 	 */
 	mb();
-	ufshcd_release(host->hba);
-	pm_runtime_put_sync(host->hba->dev);
 
 	return 0;
 }
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.


^ permalink raw reply	[flat|nested] 3+ messages in thread

* [PATCH 3/8] scsi: ufs-qcom: Remove testbus dump in ufs_qcom_dump_dbg_regs
       [not found] <1596204478-5420-1-git-send-email-cang@codeaurora.org>
  2020-07-31 14:07 ` [PATCH 2/8] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config Can Guo
@ 2020-07-31 14:07 ` Can Guo
  1 sibling, 0 replies; 3+ messages in thread
From: Can Guo @ 2020-07-31 14:07 UTC (permalink / raw)
  To: asutoshd, nguyenb, hongwus, rnayak, linux-scsi, kernel-team,
	saravanak, salyzyn, cang
  Cc: Andy Gross, Bjorn Andersson, Alim Akhtar, Avri Altman,
	James E.J. Bottomley, Martin K. Petersen,
	open list:ARM/QUALCOMM SUPPORT, open list

Dumping testbus registers is heavy enough to cause stability issues
sometime, just remove them as of now.

Signed-off-by: Can Guo <cang@codeaurora.org>
Reviewed-by: Hongwu Su <hongwus@codeaurora.org>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 7da27ee..96e0999 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1620,44 +1620,12 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host)
 	return 0;
 }
 
-static void ufs_qcom_testbus_read(struct ufs_hba *hba)
-{
-	ufshcd_dump_regs(hba, UFS_TEST_BUS, 4, "UFS_TEST_BUS ");
-}
-
-static void ufs_qcom_print_unipro_testbus(struct ufs_hba *hba)
-{
-	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
-	u32 *testbus = NULL;
-	int i, nminor = 256, testbus_len = nminor * sizeof(u32);
-
-	testbus = kmalloc(testbus_len, GFP_KERNEL);
-	if (!testbus)
-		return;
-
-	host->testbus.select_major = TSTBUS_UNIPRO;
-	for (i = 0; i < nminor; i++) {
-		host->testbus.select_minor = i;
-		ufs_qcom_testbus_config(host);
-		testbus[i] = ufshcd_readl(hba, UFS_TEST_BUS);
-	}
-	print_hex_dump(KERN_ERR, "UNIPRO_TEST_BUS ", DUMP_PREFIX_OFFSET,
-			16, 4, testbus, testbus_len, false);
-	kfree(testbus);
-}
-
 static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba)
 {
 	ufshcd_dump_regs(hba, REG_UFS_SYS1CLK_1US, 16 * 4,
 			 "HCI Vendor Specific Registers ");
 
-	/* sleep a bit intermittently as we are dumping too much data */
 	ufs_qcom_print_hw_debug_reg_all(hba, NULL, ufs_qcom_dump_regs_wrapper);
-	udelay(1000);
-	ufs_qcom_testbus_read(hba);
-	udelay(1000);
-	ufs_qcom_print_unipro_testbus(hba);
-	udelay(1000);
 }
 
 /**
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.


^ permalink raw reply	[flat|nested] 3+ messages in thread

* [PATCH 3/8] scsi: ufs-qcom: Remove testbus dump in ufs_qcom_dump_dbg_regs
       [not found] <1596182890-10086-1-git-send-email-cang@codeaurora.org>
@ 2020-07-31  8:08 ` Can Guo
  0 siblings, 0 replies; 3+ messages in thread
From: Can Guo @ 2020-07-31  8:08 UTC (permalink / raw)
  To: asutoshd, nguyenb, hongwus, rnayak, linux-scsi, kernel-team,
	saravanak, salyzyn, cang
  Cc: Andy Gross, Bjorn Andersson, Alim Akhtar, Avri Altman,
	James E.J. Bottomley, Martin K. Petersen,
	open list:ARM/QUALCOMM SUPPORT, open list

Dumping testbus registers is heavy enough to cause stability issues
sometime, just remove them as of now.

Signed-off-by: Can Guo <cang@codeaurora.org>
Reviewed-by: Hongwu Su <hongwus@codeaurora.org>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 7da27ee..96e0999 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1620,44 +1620,12 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host)
 	return 0;
 }
 
-static void ufs_qcom_testbus_read(struct ufs_hba *hba)
-{
-	ufshcd_dump_regs(hba, UFS_TEST_BUS, 4, "UFS_TEST_BUS ");
-}
-
-static void ufs_qcom_print_unipro_testbus(struct ufs_hba *hba)
-{
-	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
-	u32 *testbus = NULL;
-	int i, nminor = 256, testbus_len = nminor * sizeof(u32);
-
-	testbus = kmalloc(testbus_len, GFP_KERNEL);
-	if (!testbus)
-		return;
-
-	host->testbus.select_major = TSTBUS_UNIPRO;
-	for (i = 0; i < nminor; i++) {
-		host->testbus.select_minor = i;
-		ufs_qcom_testbus_config(host);
-		testbus[i] = ufshcd_readl(hba, UFS_TEST_BUS);
-	}
-	print_hex_dump(KERN_ERR, "UNIPRO_TEST_BUS ", DUMP_PREFIX_OFFSET,
-			16, 4, testbus, testbus_len, false);
-	kfree(testbus);
-}
-
 static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba)
 {
 	ufshcd_dump_regs(hba, REG_UFS_SYS1CLK_1US, 16 * 4,
 			 "HCI Vendor Specific Registers ");
 
-	/* sleep a bit intermittently as we are dumping too much data */
 	ufs_qcom_print_hw_debug_reg_all(hba, NULL, ufs_qcom_dump_regs_wrapper);
-	udelay(1000);
-	ufs_qcom_testbus_read(hba);
-	udelay(1000);
-	ufs_qcom_print_unipro_testbus(hba);
-	udelay(1000);
 }
 
 /**
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.


^ permalink raw reply	[flat|nested] 3+ messages in thread

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     [not found] <1596204478-5420-1-git-send-email-cang@codeaurora.org>
2020-07-31 14:07 ` [PATCH 2/8] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config Can Guo
2020-07-31 14:07 ` [PATCH 3/8] scsi: ufs-qcom: Remove testbus dump in ufs_qcom_dump_dbg_regs Can Guo
     [not found] <1596182890-10086-1-git-send-email-cang@codeaurora.org>
2020-07-31  8:08 ` Can Guo

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