From nobody Tue Nov 26 05:57:48 2024 Received: from esa6.hgst.iphmx.com (esa6.hgst.iphmx.com [216.71.154.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D374936124; Tue, 22 Oct 2024 07:45:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.71.154.45 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729583142; cv=none; b=L6dOGN9PxKtzqykdxEfAjlv6BP7kO/E9D6bTYiOksXtKvvCU75jAPzCU/9Yc+2dT3IaAIXdqTcz2p1JAR6KQzPwPbGQeK0tWqZxe1Vg6JH086jgTEl3ytwBOr2FfN/ZIQ1imR2QpRn00lnUXytoWZ0AzlXTJg8T1evvoUpa37U0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729583142; c=relaxed/simple; bh=cIh3TOoCr8Vpu8u8J5nmz829eCRHULPA3N2J4cliIr8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=XAo3sjT/qaN4tkREAwHxPUP76YoukZSHGseT2tz5qyyVj++EvcLqPKvp6Zg9DgARm/wQvW6ImicH7myRccanWuDnWYs066XzX9yvObYbeoLhIz7/kd/mTwemAhxk7jD9tXssyjIFVZAuxFJ7FlQznf5kQqMpq0dtFCg3D4CcNdU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=wdc.com; spf=pass smtp.mailfrom=wdc.com; dkim=pass (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b=BeYIQMeI; arc=none smtp.client-ip=216.71.154.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=wdc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=wdc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="BeYIQMeI" DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1729583140; x=1761119140; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=cIh3TOoCr8Vpu8u8J5nmz829eCRHULPA3N2J4cliIr8=; b=BeYIQMeI8433NN8grR3HRof6zHaecJsS99VDbC1giQTEl6HgVcXkfhVk qcEOEnMJFXuaYUZ6iJNKfMcb+DtRZq57xoEYsC2Fh/ElgTJaRNRVqkVJc KZK3T4TvEgxsFuqCdW2ePRWoYRE9y737unZ7Iey8xgXFuXLgbA8obHh8Y wyMLvqpkePN4m32CL3TPNiBJN/Eha0kEM4OX7cz1meTUCaDEhZx9vJ2mz 9Xn3uPigDsKj9TRt1rmDvytH2bqisonoivnfgLL6kTn7PSnBzgkYiqCkQ w97yAu9bF/3sPP/owZ0XIgivdxBcrSX4dQmwa/qDrvwTfqKKRzyFu+bke Q==; X-CSE-ConnectionGUID: ZSE40qeLQi270E1pKv7jDw== X-CSE-MsgGUID: 18Uw2Yk8TIu2zOMacxOEHQ== X-IronPort-AV: E=Sophos;i="6.11,222,1725292800"; d="scan'208";a="29564290" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 22 Oct 2024 15:45:33 +0800 IronPort-SDR: 671749ae_2vr7/pFedV+1IJuPCvFNkeB7OJFluhHSOuyFRF+TFB14DBr K7GgQTDaJ7rqcTyoXYuPK8THGi0oiyAxdNKU93w== Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 21 Oct 2024 23:43:59 -0700 WDCIronportException: Internal Received: from avri-office.ad.shared (HELO avri-office.sdcorp.global.sandisk.com) ([10.45.31.142]) by uls-op-cesaip01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 22 Oct 2024 00:45:32 -0700 From: Avri Altman To: "Martin K . Petersen" Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Bart Van Assche , Avri Altman Subject: [PATCH v2 1/3] scsi: ufs: core: Remove redundant host_lock calls around UTMRLDBR. Date: Tue, 22 Oct 2024 10:43:17 +0300 Message-Id: <20241022074319.512127-2-avri.altman@wdc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241022074319.512127-1-avri.altman@wdc.com> References: <20241022074319.512127-1-avri.altman@wdc.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" There is no need to serialize single read/write calls to the host controller registers. Remove the redundant host_lock calls that protect access to the task management doorbell register: UTMRLDBR. Signed-off-by: Avri Altman --- drivers/ufs/core/ufshcd.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 9e6d008f4ea4..29f1cd3375bd 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -1245,11 +1245,13 @@ static bool ufshcd_is_devfreq_scaling_required(stru= ct ufs_hba *hba, static u32 ufshcd_pending_cmds(struct ufs_hba *hba) { const struct scsi_device *sdev; + unsigned long flags; u32 pending =3D 0; =20 - lockdep_assert_held(hba->host->host_lock); + spin_lock_irqsave(hba->host->host_lock, flags); __shost_for_each_device(sdev, hba->host) pending +=3D sbitmap_weight(&sdev->budget_map); + spin_unlock_irqrestore(hba->host->host_lock, flags); =20 return pending; } @@ -1263,7 +1265,6 @@ static u32 ufshcd_pending_cmds(struct ufs_hba *hba) static int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba, u64 wait_timeout_us) { - unsigned long flags; int ret =3D 0; u32 tm_doorbell; u32 tr_pending; @@ -1271,7 +1272,6 @@ static int ufshcd_wait_for_doorbell_clr(struct ufs_hb= a *hba, ktime_t start; =20 ufshcd_hold(hba); - spin_lock_irqsave(hba->host->host_lock, flags); /* * Wait for all the outstanding tasks/transfer requests. * Verify by checking the doorbell registers are clear. @@ -1292,7 +1292,6 @@ static int ufshcd_wait_for_doorbell_clr(struct ufs_hb= a *hba, break; } =20 - spin_unlock_irqrestore(hba->host->host_lock, flags); io_schedule_timeout(msecs_to_jiffies(20)); if (ktime_to_us(ktime_sub(ktime_get(), start)) > wait_timeout_us) { @@ -1304,7 +1303,6 @@ static int ufshcd_wait_for_doorbell_clr(struct ufs_hb= a *hba, */ do_last_check =3D true; } - spin_lock_irqsave(hba->host->host_lock, flags); } while (tm_doorbell || tr_pending); =20 if (timeout) { @@ -1314,7 +1312,6 @@ static int ufshcd_wait_for_doorbell_clr(struct ufs_hb= a *hba, ret =3D -EBUSY; } out: - spin_unlock_irqrestore(hba->host->host_lock, flags); ufshcd_release(hba); return ret; } @@ -6877,13 +6874,13 @@ static irqreturn_t ufshcd_check_errors(struct ufs_h= ba *hba, u32 intr_status) */ static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba) { - unsigned long flags, pending, issued; + unsigned long flags; + unsigned long pending =3D ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL); + unsigned long issued =3D hba->outstanding_tasks & ~pending; irqreturn_t ret =3D IRQ_NONE; int tag; =20 spin_lock_irqsave(hba->host->host_lock, flags); - pending =3D ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL); - issued =3D hba->outstanding_tasks & ~pending; for_each_set_bit(tag, &issued, hba->nutmrs) { struct request *req =3D hba->tmf_rqs[tag]; struct completion *c =3D req->end_io_data; @@ -7065,12 +7062,13 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hb= a, memcpy(hba->utmrdl_base_addr + task_tag, treq, sizeof(*treq)); ufshcd_vops_setup_task_mgmt(hba, task_tag, tm_function); =20 - /* send command to the controller */ __set_bit(task_tag, &hba->outstanding_tasks); - ufshcd_writel(hba, 1 << task_tag, REG_UTP_TASK_REQ_DOOR_BELL); =20 spin_unlock_irqrestore(host->host_lock, flags); =20 + /* send command to the controller */ + ufshcd_writel(hba, 1 << task_tag, REG_UTP_TASK_REQ_DOOR_BELL); + ufshcd_add_tm_upiu_trace(hba, task_tag, UFS_TM_SEND); =20 /* wait until the task management command is completed */ --=20 2.25.1