linux-kernel - [PATCH v12 03/15] ufs: core: Defer adding host to scsi if mcq is supported

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <1f155ce224cfaa7ba9e7a1219a8807add5168ba2.1672771664.git.quic_asutoshd@quicinc.com>
Date:   Tue, 3 Jan 2023 11:09:22 -0800
From:   Asutosh Das <quic_asutoshd@...cinc.com>
To:     <quic_cang@...cinc.com>, <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>
CC:     <quic_nguyenb@...cinc.com>, <quic_xiaosenh@...cinc.com>,
        <stanley.chu@...iatek.com>, <adrian.hunter@...el.com>,
        <bvanassche@....org>, <avri.altman@....com>, <mani@...nel.org>,
        <beanhuo@...ron.com>, Asutosh Das <quic_asutoshd@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Jinyoung Choi <j-young.choi@...sung.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH v12 03/15] ufs: core: Defer adding host to scsi if mcq is supported

If MCQ support is present, enabling it after MCQ support
has been configured would require reallocating tags and memory.
It would also free up the already allocated memory in
Single Doorbell Mode. So defer invoking scsi_add_host() until
MCQ is configured.

Co-developed-by: Can Guo <quic_cang@...cinc.com>
Signed-off-by: Can Guo <quic_cang@...cinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@...cinc.com>
Reviewed-by: Bart Van Assche <bvanassche@....org>
Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>
---
 drivers/ufs/core/ufshcd.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index bc30268..2efd115 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -95,6 +95,11 @@
 /* UFSHC 4.0 compliant HC support this mode, refer param_set_mcq_mode() */
 static bool use_mcq_mode = true;
 
+static bool is_mcq_supported(struct ufs_hba *hba)
+{
+	return hba->mcq_sup && use_mcq_mode;
+}
+
 static int param_set_mcq_mode(const char *val, const struct kernel_param *kp)
 {
 	int ret;
@@ -8301,6 +8306,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
 	int ret;
 	unsigned long flags;
 	ktime_t start = ktime_get();
+	struct Scsi_Host *host = hba->host;
 
 	hba->ufshcd_state = UFSHCD_STATE_RESET;
 
@@ -8335,6 +8341,14 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
 		ret = ufshcd_device_params_init(hba);
 		if (ret)
 			goto out;
+
+		if (is_mcq_supported(hba)) {
+			ret = scsi_add_host(host, hba->dev);
+			if (ret) {
+				dev_err(hba->dev, "scsi_add_host failed\n");
+				goto out;
+			}
+		}
 	}
 
 	ufshcd_tune_unipro_params(hba);
@@ -9933,10 +9947,12 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
 		hba->is_irq_enabled = true;
 	}
 
-	err = scsi_add_host(host, hba->dev);
-	if (err) {
-		dev_err(hba->dev, "scsi_add_host failed\n");
-		goto out_disable;
+	if (!is_mcq_supported(hba)) {
+		err = scsi_add_host(host, hba->dev);
+		if (err) {
+			dev_err(hba->dev, "scsi_add_host failed\n");
+			goto out_disable;
+		}
 	}
 
 	hba->tmf_tag_set = (struct blk_mq_tag_set) {
-- 
2.7.4