linux-kernel - [PATCH V2 3/3] soc/tegra: pmc: Update scratch as an optional aperture

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, 17 Jan 2024 20:25:04 +0000
From: Petlozu Pravareshwar <petlozup@...dia.com>
To: <thierry.reding@...il.com>, <jonathanh@...dia.com>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
	<p.zabel@...gutronix.de>, <dmitry.osipenko@...labora.com>,
	<ulf.hansson@...aro.org>, <kkartik@...dia.com>, <cai.huoqing@...ux.dev>,
	<spatra@...dia.com>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: <petlozup@...dia.com>
Subject: [PATCH V2 3/3] soc/tegra: pmc: Update scratch as an optional aperture

Scratch address space register is used to store reboot reason. For
some Tegra234 systems, the scratch space is not available to store
the reboot reason. This is because scratch region on these systems
is not accessible by the kernel as restricted by the Hypervisor.
Such systems would delist scratch aperture from PMC DT node.

Hence this change makes scratch as optional aperture and also avoids
registering reboot notifier if scratch address space isn't mapped.

Signed-off-by: Petlozu Pravareshwar <petlozup@...dia.com>
---
 drivers/soc/tegra/pmc.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 0bc983f6b088..6948f78c7a4a 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -2903,11 +2903,16 @@ static int tegra_pmc_probe(struct platform_device *pdev)
 		if (IS_ERR(pmc->aotag))
 			return PTR_ERR(pmc->aotag);
 
+		/* "scratch" is an optional aperture */
 		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 						"scratch");
-		pmc->scratch = devm_ioremap_resource(&pdev->dev, res);
-		if (IS_ERR(pmc->scratch))
-			return PTR_ERR(pmc->scratch);
+		if (res) {
+			pmc->scratch = devm_ioremap_resource(&pdev->dev, res);
+			if (IS_ERR(pmc->scratch))
+				return PTR_ERR(pmc->scratch);
+		} else {
+			pmc->scratch = NULL;
+		}
 	}
 
 	pmc->clk = devm_clk_get_optional(&pdev->dev, "pclk");
@@ -2919,12 +2924,15 @@ static int tegra_pmc_probe(struct platform_device *pdev)
 	 * PMC should be last resort for restarting since it soft-resets
 	 * CPU without resetting everything else.
 	 */
-	err = devm_register_reboot_notifier(&pdev->dev,
-					    &tegra_pmc_reboot_notifier);
-	if (err) {
-		dev_err(&pdev->dev, "unable to register reboot notifier, %d\n",
-			err);
-		return err;
+	if (pmc->scratch) {
+		err = devm_register_reboot_notifier(&pdev->dev,
+						    &tegra_pmc_reboot_notifier);
+		if (err) {
+			dev_err(&pdev->dev,
+				"unable to register reboot notifier, %d\n",
+				err);
+			return err;
+		}
 	}
 
 	err = devm_register_sys_off_handler(&pdev->dev,
-- 
2.25.1