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ANDROID: pstore/ram: Add backward compatibility for ramoops reserved region

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Some of the platforms might be still expecting dedicated memory region
for ramoops node. So add logic to detect the start and size of the
ramoops memory region by looking up reserved memory region with
of_reserved_mem_lookup() when platform_get_resource() failed.

Bug: 191636717
Change-Id: Idc479b45fb3f637f7235efd6eabac62059d5e92b
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
This commit is contained in:
Prasad Sodagudi
2021-07-09 10:04:36 -07:00
committed by Todd Kjos
parent df97297651
commit 9b136eab76
1 changed files with 15 additions and 7 deletions
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14
fs/pstore/ram.c
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@@ -635,20 +635,28 @@ static int ramoops_parse_dt(struct platform_device *pdev,
struct device_node *of_node = pdev->dev.of_node; struct device_node *of_node = pdev->dev.of_node;
struct device_node *parent_node; struct device_node *parent_node;
struct reserved_mem *rmem; struct reserved_mem *rmem;
struct resource *res;
u32 value; u32 value;
int ret; int ret;
dev_dbg(&pdev->dev, "using Device Tree\n"); 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); rmem = of_reserved_mem_lookup(of_node);
if (!rmem) { if (rmem) {
pdata->mem_size = rmem->size;
pdata->mem_address = rmem->base;
} else {
dev_err(&pdev->dev, dev_err(&pdev->dev,
"failed to locate DT /reserved-memory resource\n"); "failed to locate DT /reserved-memory resource\n");
return -EINVAL; return -EINVAL;
} }
} else {
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 * Setting "unbuffered" is deprecated and will be ignored if
* "mem_type" is also specified. * "mem_type" is also specified.