linux-kernel - [PATCH 1/2] scsi: ufs: core: Add hibernation callbacks

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:   Wed, 21 Dec 2022 22:42:21 +0530
From:   Anjana Hari <quic_ahari@...cinc.com>
To:     <agross@...nel.org>, <andersson@...nel.org>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>
CC:     <alim.akhtar@...sung.com>, <avri.altman@....com>,
        <bvanassche@....org>, <konrad.dybcio@...aro.org>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_narepall@...cinc.com>, <quic_nitirawa@...cinc.com>,
        <quic_rampraka@...cinc.com>, Anjana Hari <quic_ahari@...cinc.com>
Subject: [PATCH 1/2] scsi: ufs: core: Add hibernation callbacks

Add hibernation call backs - freeze, restore and thaw.
Add the respective prototypes.

Signed-off-by: Anjana Hari <quic_ahari@...cinc.com>
---
 drivers/ufs/core/ufshcd.c | 80 +++++++++++++++++++++++++++++++++++++++
 include/ufs/ufshcd.h      |  6 +++
 2 files changed, 86 insertions(+)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index bda61be5f035..c216a97dc1dd 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -9453,6 +9453,25 @@ static int ufshcd_resume(struct ufs_hba *hba)
 
 	/* enable the host irq as host controller would be active soon */
 	ufshcd_enable_irq(hba);
+
+	if (hba->restore) {
+		/* Configure UTRL and UTMRL base address registers */
+		ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
+			      REG_UTP_TRANSFER_REQ_LIST_BASE_L);
+		ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),
+			      REG_UTP_TRANSFER_REQ_LIST_BASE_H);
+		ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),
+			      REG_UTP_TASK_REQ_LIST_BASE_L);
+		ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),
+			      REG_UTP_TASK_REQ_LIST_BASE_H);
+		/* Commit the registers */
+		mb();
+	}
+
+	/* Resuming from hibernate, assume that link was OFF */
+	if (hba->restore)
+		ufshcd_set_link_off(hba);
+
 	goto out;
 
 disable_vreg:
@@ -9616,6 +9635,67 @@ void ufshcd_remove(struct ufs_hba *hba)
 }
 EXPORT_SYMBOL_GPL(ufshcd_remove);
 
+int ufshcd_system_freeze(struct device *dev)
+{
+
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int ret = 0;
+
+	/*
+	 * Run time resume the controller to make sure
+	 * the PM work queue threads do not try to resume
+	 * the child (scsi host), which leads to errors as
+	 * the controller is not yet resumed.
+	 */
+	pm_runtime_get_sync(hba->dev);
+	ret = ufshcd_system_suspend(dev);
+	pm_runtime_put_sync(hba->dev);
+
+	/*
+	 * Ensure no runtime PM operations take
+	 * place in the hibernation and restore sequence
+	 * on successful freeze operation.
+	 */
+	if (!ret)
+		pm_runtime_disable(hba->dev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ufshcd_system_freeze);
+
+int ufshcd_system_restore(struct device *dev)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int ret = 0;
+
+	hba->restore = true;
+	ret = ufshcd_system_resume(dev);
+
+	/*
+	 * Now any runtime PM operations can be
+	 * allowed on successful restore operation
+	 */
+	if (!ret)
+		pm_runtime_enable(hba->dev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_system_restore);
+
+int ufshcd_system_thaw(struct device *dev)
+{
+
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int ret = 0;
+
+	ret = ufshcd_system_resume(dev);
+	if (!ret)
+		pm_runtime_enable(hba->dev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_system_thaw);
+
 /**
  * ufshcd_dealloc_host - deallocate Host Bus Adapter (HBA)
  * @hba: pointer to Host Bus Adapter (HBA)
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 5cf81dff60aa..dadb3c732be4 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -978,6 +978,9 @@ struct ufs_hba {
 #endif
 	u32 luns_avail;
 	bool complete_put;
+
+	/* Distinguish between resume and restore */
+	bool restore;
 };
 
 /* Returns true if clocks can be gated. Otherwise false */
@@ -1101,6 +1104,9 @@ extern int ufshcd_runtime_resume(struct device *dev);
 extern int ufshcd_system_suspend(struct device *dev);
 extern int ufshcd_system_resume(struct device *dev);
 #endif
+extern int ufshcd_system_freeze(struct device *dev);
+extern int ufshcd_system_thaw(struct device *dev);
+extern int ufshcd_system_restore(struct device *dev);
 extern int ufshcd_shutdown(struct ufs_hba *hba);
 extern int ufshcd_dme_configure_adapt(struct ufs_hba *hba,
 				      int agreed_gear,
-- 
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project