linux-kernel - [PATCH] pstore/ram: Rework logic for detecting ramoops reserved memory region

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Date:   Fri, 25 Jun 2021 16:47:18 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     keescook@...omium.org, anton@...msg.org, ccross@...roid.com,
        tony.luck@...el.com, linux-kernel@...r.kernel.org
Cc:     "Isaac J. Manjarres" <isaacm@...eaurora.org>,
        Mukesh Ojha <mojha@...eaurora.org>
Subject: [PATCH] pstore/ram: Rework logic for detecting ramoops reserved memory region

From: "Isaac J. Manjarres" <isaacm@...eaurora.org>

The reserved memory region for ramoops is assumed to be at a fixed
and known location when read from the devicetree. This is not desirable
in environments where it is preferred for the region to be dynamically
allocated at runtime, as opposed to it being fixed at compile time.

Change the logic for detecting the start and size of the ramoops
memory region by looking up the reserved memory region instead of
using platform_get_resource(), which assumes that the location
of the memory is known ahead of time.

Signed-off-by: Isaac J. Manjarres <isaacm@...eaurora.org>
Signed-off-by: Mukesh Ojha <mojha@...eaurora.org>
---
 fs/pstore/ram.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index fefe3d3..5f90455 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -21,6 +21,7 @@
 #include <linux/pstore_ram.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
 #include "internal.h"
 
 #define RAMOOPS_KERNMSG_HDR "===="
@@ -633,21 +634,21 @@ static int ramoops_parse_dt(struct platform_device *pdev,
 {
 	struct device_node *of_node = pdev->dev.of_node;
 	struct device_node *parent_node;
-	struct resource *res;
+	struct reserved_mem *rmem;
 	u32 value;
 	int ret;
 
 	dev_dbg(&pdev->dev, "using Device Tree\n");
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
+	rmem = of_reserved_mem_lookup(of_node);
+	if (!rmem) {
 		dev_err(&pdev->dev,
 			"failed to locate DT /reserved-memory resource\n");
 		return -EINVAL;
 	}
 
-	pdata->mem_size = resource_size(res);
-	pdata->mem_address = res->start;
+	pdata->mem_size = rmem->size;
+	pdata->mem_address = rmem->base;
 	/*
 	 * Setting "unbuffered" is deprecated and will be ignored if
 	 * "mem_type" is also specified.
-- 
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