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Tue, 19 Jan 2021 11:40:12 +0900 (KST) Received: from ubuntu.dsn.sec.samsung.com (unknown [12.36.155.120]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20210119024012epsmtip2283fdba17de0d85d207cef1cafc49551~bgc3IXs5N0357703577epsmtip2d; Tue, 19 Jan 2021 02:40:12 +0000 (GMT) From: Kiwoong Kim To: linux-scsi@vger.kernel.org, alim.akhtar@samsung.com, avri.altman@wdc.com, jejb@linux.ibm.com, martin.petersen@oracle.com, beanhuo@micron.com, asutoshd@codeaurora.org, cang@codeaurora.org, bvanassche@acm.org, grant.jung@samsung.com, sc.suh@samsung.com, hy50.seo@samsung.com, sh425.lee@samsung.com, bhoon95.kim@samsung.com Cc: Kiwoong Kim Subject: [ PATCH v6 1/2] ufs: introduce a quirk to allow only page-aligned sg entries Date: Tue, 19 Jan 2021 11:28:48 +0900 Message-Id: <56dddef94f60bd9466fd77e69f64bbbd657ed2a1.1611023224.git.kwmad.kim@samsung.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: In-Reply-To: X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrAJsWRmVeSWpSXmKPExsWy7bCmqW6vG1uCQd97KYsH87axWextO8Fu 8fLnVTaLgw87WSy+Ln3GajHtw09mi0/rl7Fa/Pq7nt1i9eIHLBaLbmxjsri55SiLRff1HWwW y4//Y7LounuD0WLpv7csDvwel694e1zu62XymLDoAKPH9/UdbB4fn95i8ejbsorR4/MmOY/2 A91MARxROTYZqYkpqUUKqXnJ+SmZeem2St7B8c7xpmYGhrqGlhbmSgp5ibmptkouPgG6bpk5 QMcrKZQl5pQChQISi4uV9O1sivJLS1IVMvKLS2yVUgtScgoMDQv0ihNzi0vz0vWS83OtDA0M jEyBKhNyMs50/mMt+MZf8fjvV9YGxu88XYycHBICJhL9ja2MXYxcHEICOxglDp86wwThfGKU WPhqCVTmG6PEkpdHmWBa2l88Z4FI7GWUODd/KTuE84NR4u7nO+wgVWwCmhJPb04FmyUicIZJ 4lrrWVaQBLOAusSuCSeAEhwcwgLhEjt+uYCEWQRUJc58XccCYvMKREvMbNoDtU1O4ua5TmYQ m1PAUmL24jOMqGwuoJq5HBJXni1ng2hwkZjzfA47hC0s8er4FihbSuJlfxuUXS+xb2oDK0Rz D6PE033/GCESxhKznrUzghzHDPTB+l36IKaEgLLEkVssEOfzSXQc/ssOEeaV6GgTgmhUlvg1 aTLUEEmJmTfvQG3ykPi87TwbJHyANp1acoF9AqP8LIQFCxgZVzGKpRYU56anFhsVGCFH3yZG cFLVctvBOOXtB71DjEwcjIcYJTiYlUR4S9cxJQjxpiRWVqUW5ccXleakFh9iNAUG5ERmKdHk fGBazyuJNzQ1MjMzsDS1MDUzslAS5y02eBAvJJCeWJKanZpakFoE08fEwSnVwHSgVVrA8UiT Re6JaLU9NyLqlsjqHgnIZ0rexfpuC2PzjJQTOTv5YtfLZlnuEXjOfdOgqv2c5KyGjA2vrKbu YAzK7zjLIVbyOkV1Z/kztk6djmkKuRt1GAq6WJuVX64WUa+68fxSdKQKc1XEUdse8Y+fs/SY NVess86T1uG8HbDmUtpxg2ve3bv3f5KpZWv+8W8/X7PvrCYJ33CvfWKHr2s8ZxN5Yxy1nVst rqDq5eqC56q37F++cMwuebj7W8nLb7ML9LxyZjjzqrn7ClgXX1H68czq5p67a66xz74w/Sj7 gW7/O0+uWk4LWbrvn9+sNvnKtscczO6VK6NY1xbMvLGYhytF4InFzZq3x7orlFiKMxINtZiL ihMBlIPm6TMEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrKLMWRmVeSWpSXmKPExsWy7bCSvG6PG1uCwZ8JmhYP5m1js9jbdoLd 4uXPq2wWBx92slh8XfqM1WLah5/MFp/WL2O1+PV3PbvF6sUPWCwW3djGZHFzy1EWi+7rO9gs lh//x2TRdfcGo8XSf29ZHPg9Ll/x9rjc18vkMWHRAUaP7+s72Dw+Pr3F4tG3ZRWjx+dNch7t B7qZAjiiuGxSUnMyy1KL9O0SuDLOdP5jLfjGX/H471fWBsbvPF2MnBwSAiYS7S+es3QxcnEI CexmlNj89hYLREJS4sTO54wQtrDE/ZYjrCC2kMA3RonXR71AbDYBTYmnN6cygTSLCNxjkrg0 YS4zSIJZQF1i14QTTCC2sECoRMvp5WwgNouAqsSZr+vAFvAKREvMbNrDBLFATuLmuU6wXk4B S4nZi88wQiyzkLj15R07LvEJjAILGBlWMUqmFhTnpucWGxYY5qWW6xUn5haX5qXrJefnbmIE x4SW5g7G7as+6B1iZOJgPMQowcGsJMJbuo4pQYg3JbGyKrUoP76oNCe1+BCjNAeLkjjvha6T 8UIC6YklqdmpqQWpRTBZJg5OqQYmG76THinFlen5v07/fHZvw253wzeOdn28m43TLVKvKdYX J1/56DM5vPKoTZZTt7TBe2FP21CtdtWQVZ2B2y9tOhj6ZOU5tqvWLA7nFpms3Cq5br+As8DR b3nNv6wfms3d9sk1Kfh8q96y7PNXJJc7vPE9UGVivOp9nVitfcdFFperc+6m2B5bdCVp05aj wssZpRyubJWt7/I86/Ba51Wh/5XS9vX9v4KiTM8V2RdLyeSKLYi2jdt+dr8Of/BdlkPeWU9P ph2skGbYm7c6bdmhtaYSDO2THddL1PnO0vZaZbwuU7ogYZ30VOubG322MmZl+n9QytSv9rv4 Qtc8rnFdwypHl6nuD6d/OfX5krsSS3FGoqEWc1FxIgDt41pV+AIAAA== X-CMS-MailID: 20210119024012epcas2p2b99e5846e1e04d8a8fab76c75bf534a7 X-Msg-Generator: CA X-Sendblock-Type: AUTO_CONFIDENTIAL CMS-TYPE: 102P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20210119024012epcas2p2b99e5846e1e04d8a8fab76c75bf534a7 References: Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Some SoCs could require one scatterlist entry for smaller than page size, i.e. 4KB. For the cases of dispatching commands with more than one scatterlist entry and under 4KB size, They could behave as follows: Given that a command to read something from device is dispatched with two scatterlist entries that are named AAA and BBB. After dispatching, host builds two PRDT entries and during transmission, device sends just one DATA IN because device doesn't care on host dma. The host then tranfers the whole data from start address of the area named AAA. In consequence, the area that follows AAA would be corrupted. |<------------->| +-------+------------ +-------+ + AAA + (corrupted) ... + BBB + +-------+------------ +-------+ In this case, you need to force an aligment with page size for sg entries. Signed-off-by: Kiwoong Kim --- drivers/scsi/ufs/ufshcd.c | 2 ++ drivers/scsi/ufs/ufshcd.h | 4 ++++ 2 files changed, 6 insertions(+) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index e221add..847eb02 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -4792,6 +4792,8 @@ static int ufshcd_slave_configure(struct scsi_device *sdev) struct request_queue *q = sdev->request_queue; blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1); + if (hba->quirks & UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE) + blk_queue_update_dma_alignment(q, PAGE_SIZE - 1); if (ufshcd_is_rpm_autosuspend_allowed(hba)) sdev->rpm_autosuspend = 1; diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 9bb5f0e..9e7223f 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -549,6 +549,10 @@ enum ufshcd_quirks { */ UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL = 1 << 12, + /* + * This quirk allows only sg entries aligned with page size. + */ + UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE = 1 << 13, }; enum ufshcd_caps {