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Bottomley" , Krzysztof Kozlowski , open list Subject: [PATCH v3 15/17] ufs: core: mcq: Add completion support in poll Date: Thu, 20 Oct 2022 11:03:44 -0700 Message-ID: <4422b890dd7cb2f4c396669012c4247467c7b8e2.1666288432.git.quic_asutoshd@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01a.na.qualcomm.com (10.52.223.231) Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Complete cqe requests in poll. Assumption is that several poll completion may happen in different CPUs for the same Completion Queue. Hence a spin lock protection is added. Co-developed-by: Can Guo Signed-off-by: Can Guo Signed-off-by: Asutosh Das Reviewed-by: Bart Van Assche --- drivers/ufs/core/ufs-mcq.c | 13 +++++++++++++ drivers/ufs/core/ufshcd-priv.h | 2 ++ drivers/ufs/core/ufshcd.c | 7 +++++++ include/ufs/ufshcd.h | 2 ++ 4 files changed, 24 insertions(+) diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c index 7bf5f80..b51ba35 100644 --- a/drivers/ufs/core/ufs-mcq.c +++ b/drivers/ufs/core/ufs-mcq.c @@ -379,6 +379,18 @@ unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba, return completed_reqs; } +unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba, + struct ufs_hw_queue *hwq) +{ + unsigned long completed_reqs; + + spin_lock(&hwq->cq_lock); + completed_reqs = ufshcd_mcq_poll_cqe_nolock(hba, hwq); + spin_unlock(&hwq->cq_lock); + + return completed_reqs; +} + void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba) { struct ufs_hw_queue *hwq; @@ -472,6 +484,7 @@ int ufshcd_mcq_init(struct ufs_hba *hba) hwq = &hba->uhq[i]; hwq->max_entries = hba->nutrs; spin_lock_init(&hwq->sq_lock); + spin_lock_init(&hwq->cq_lock); } /* The very first HW queue is to serve device command */ diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h index 417e2ca..6e9bec6 100644 --- a/drivers/ufs/core/ufshcd-priv.h +++ b/drivers/ufs/core/ufshcd-priv.h @@ -64,6 +64,8 @@ unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba, struct ufs_hw_queue *hwq); struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba, struct request *req); +unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba, + struct ufs_hw_queue *hwq); #define UFSHCD_MCQ_IO_QUEUE_OFFSET 1 #define SD_ASCII_STD true diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index af1f99e..aaade38 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -5439,6 +5439,13 @@ static int ufshcd_poll(struct Scsi_Host *shost, unsigned int queue_num) struct ufs_hba *hba = shost_priv(shost); unsigned long completed_reqs, flags; u32 tr_doorbell; + struct ufs_hw_queue *hwq; + + if (is_mcq_enabled(hba)) { + hwq = &hba->uhq[queue_num + UFSHCD_MCQ_IO_QUEUE_OFFSET]; + + return ufshcd_mcq_poll_cqe_lock(hba, hwq); + } spin_lock_irqsave(&hba->outstanding_lock, flags); tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL); diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index ba4ef0a..506fc6e 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -1062,6 +1062,7 @@ struct ufs_hba { * @sq_lock: serialize submission queue access * @cq_tail_slot: current slot to which CQ tail pointer is pointing * @cq_head_slot: current slot to which CQ head pointer is pointing + * @cq_lock: Synchronize between multiple polling instances */ struct ufs_hw_queue { void __iomem *mcq_sq_head; @@ -1079,6 +1080,7 @@ struct ufs_hw_queue { spinlock_t sq_lock; u32 cq_tail_slot; u32 cq_head_slot; + spinlock_t cq_lock; }; static inline bool is_mcq_enabled(struct ufs_hba *hba)