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From: Asutosh Das <asutoshd@codeaurora.org>
To: subhashj@codeaurora.org, cang@codeaurora.org,
	vivek.gautam@codeaurora.org, rnayak@codeaurora.org,
	vinholikatti@gmail.com, jejb@linux.vnet.ibm.com,
	martin.petersen@oracle.com, asutoshd@codeaurora.org,
	linux-mmc@vger.kernel.org
Cc: linux-scsi@vger.kernel.org, Maya Erez <merez@codeaurora.org>,
	linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v2 04/10] scsi: ufs: fix exception event handling
Date: Thu,  3 May 2018 16:37:16 +0530	[thread overview]
Message-ID: <01e6421c38e4eb1f67f3c98a8dab44a85f791ef2.1525343531.git.asutoshd@codeaurora.org> (raw)
In-Reply-To: <cover.1525341340.git.asutoshd@codeaurora.org>
In-Reply-To: <cover.1525343531.git.asutoshd@codeaurora.org>

From: Maya Erez <merez@codeaurora.org>

The device can set the exception event bit in one of the response UPIU,
for example to notify the need for urgent BKOPs operation.
In such a case the host driver calls ufshcd_exception_event_handler to
handle this notification.
When trying to check the exception event status (for finding the cause for
the exception event), the device may be busy with additional SCSI commands
handling and may not respond within the 100ms timeout.

To prevent that, we need to block SCSI commands during handling of
exception events and allow retransmissions of the query requests,
in case of timeout.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
---
 drivers/scsi/ufs/ufshcd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 6dabce8..838ba8f0 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4967,6 +4967,7 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
 	hba = container_of(work, struct ufs_hba, eeh_work);
 
 	pm_runtime_get_sync(hba->dev);
+	scsi_block_requests(hba->host);
 	err = ufshcd_get_ee_status(hba, &status);
 	if (err) {
 		dev_err(hba->dev, "%s: failed to get exception status %d\n",
@@ -4980,6 +4981,7 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
 		ufshcd_bkops_exception_event_handler(hba);
 
 out:
+	scsi_unblock_requests(hba->host);
 	pm_runtime_put_sync(hba->dev);
 	return;
 }
-- 
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.

  parent reply	other threads:[~2018-05-03 11:14 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <cover.1525341340.git.asutoshd@codeaurora.org>
     [not found] ` <cover.1525343531.git.asutoshd@codeaurora.org>
2018-05-03 11:07   ` [PATCH v2 01/10] scsi: ufs: Allowing power mode change Asutosh Das
2018-05-16 21:09     ` Subhash Jadavani
2018-05-03 11:07   ` [PATCH v2 02/10] scsi: ufs-qcom: Enable UFSHCD_QUIRK_BROKEN_PWR_MODE_CHANGE quirk Asutosh Das
2018-05-16 21:10     ` Subhash Jadavani
2018-05-03 11:07   ` [PATCH v2 03/10] scsi: ufs: Add LCC quirk for host and device Asutosh Das
2018-05-16 21:11     ` Subhash Jadavani
2018-05-03 11:07   ` Asutosh Das [this message]
2018-05-16 21:12     ` [PATCH v2 04/10] scsi: ufs: fix exception event handling Subhash Jadavani
2018-05-03 11:07   ` [PATCH v2 05/10] scsi: ufshcd: fix possible unclocked register access Asutosh Das
2018-05-16 21:12     ` Subhash Jadavani
2018-05-03 11:07   ` [PATCH v2 06/10] scsi: ufs: add reference counting for scsi block requests Asutosh Das
2018-05-16 21:13     ` Subhash Jadavani
2018-05-03 11:07   ` [PATCH v2 07/10] scsi: ufs-qcom: remove broken hci version quirk Asutosh Das
2018-05-16 21:13     ` Subhash Jadavani
2018-05-03 11:07   ` [PATCH v2 08/10] scsi: ufs: make sure all interrupts are processed Asutosh Das
2018-05-16 21:14     ` Subhash Jadavani
2018-05-03 11:07   ` [PATCH v2 09/10] scsi: ufs: fix irq return code Asutosh Das
2018-06-28 22:26     ` Subhash Jadavani
2018-05-03 11:07   ` [PATCH v2 10/10] scsi: ufs: Add clock ungating to a separate workqueue Asutosh Das
2018-05-16 21:14     ` Subhash Jadavani

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