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resource: Consolidate resource walking code 

The walk_iomem_res_desc(), walk_system_ram_res() and walk_system_ram_range()
functions each have much of the same code.

Create a new function that consolidates the common code from these
functions in one place to reduce the amount of duplicated code.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Tested-by: Borislav Petkov <bp@suse.de>
Cc: kvm@vger.kernel.org
Cc: Borislav Petkov <bp@alien8.de>
Link: https://lkml.kernel.org/r/20171020143059.3291-9-brijesh.singh@amd.com
This commit is contained in:
Tom Lendacky 2017-10-20 09:30:50 -05:00 committed by Thomas Gleixner
parent 1379edd596
commit 4ac2aed837
1 changed files with 25 additions and 27 deletions
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52
kernel/resource.c
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@ -400,6 +400,26 @@ static int find_next_iomem_res(struct resource *res, unsigned long desc,
return 0;
}
static int __walk_iomem_res_desc(struct resource *res, unsigned long desc,
bool first_level_children_only,
void *arg, int (*func)(u64, u64, void *))
{
u64 orig_end = res->end;
int ret = -1;
while ((res->start < res->end) &&
!find_next_iomem_res(res, desc, first_level_children_only)) {
ret = (*func)(res->start, res->end, arg);
if (ret)
break;
res->start = res->end + 1;
res->end = orig_end;
}
return ret;
}
/*
* Walks through iomem resources and calls func() with matching resource
* ranges. This walks through whole tree and not just first level children.
@ -418,26 +438,12 @@ int walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start,
u64 end, void *arg, int (*func)(u64, u64, void *))
{
struct resource res;
u64 orig_end;
int ret = -1;
res.start = start;
res.end = end;
res.flags = flags;
orig_end = res.end;
while ((res.start < res.end) &&
(!find_next_iomem_res(&res, desc, false))) {
ret = (*func)(res.start, res.end, arg);
if (ret)
break;
res.start = res.end + 1;
res.end = orig_end;
}
return ret;
return __walk_iomem_res_desc(&res, desc, false, arg, func);
}
/*
@ -451,22 +457,13 @@ int walk_system_ram_res(u64 start, u64 end, void *arg,
int (*func)(u64, u64, void *))
{
struct resource res;
u64 orig_end;
int ret = -1;
res.start = start;
res.end = end;
res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
orig_end = res.end;
while ((res.start < res.end) &&
(!find_next_iomem_res(&res, IORES_DESC_NONE, true))) {
ret = (*func)(res.start, res.end, arg);
if (ret)
break;
res.start = res.end + 1;
res.end = orig_end;
}
return ret;
return __walk_iomem_res_desc(&res, IORES_DESC_NONE, true,
arg, func);
}
#if !defined(CONFIG_ARCH_HAS_WALK_MEMORY)
@ -508,6 +505,7 @@ static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg)
{
return 1;
}
/*
* This generic page_is_ram() returns true if specified address is
* registered as System RAM in iomem_resource list.