Resource providers set this flag if they want
that request_region_XXX will print a warning in dmesg
if this particular resource is locked by a driver.
Thous acting as a Protocol Police about experimental
devices that did not pass a comity approval.
The Only user of this flag is x86/kernel/e820.c that
wants to WARN about UNKNOWN memory types.
Signed-off-by: Boaz Harrosh <b...@plexistor.com>
---
arch/x86/kernel/e820.c | 3 +++
include/linux/ioport.h | 2 +-
kernel/resource.c | 7 ++++++-
3 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 1a8a1c3..105bb37 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -961,6 +961,9 @@ void __init e820_reserve_resources(void)
res->flags = IORESOURCE_MEM;
+ if (_is_unknown_type(e820.map[i].type))
+ res->flags |= IORESOURCE_MEM_WARN;
+
/*
* don't register the region that could be conflicted with
* pci device BAR resource and insert them later in
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 2c525022..183af93 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -90,6 +90,7 @@ struct resource {
#define IORESOURCE_MEM_32BIT (3<<3)
#define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */
#define IORESOURCE_MEM_EXPANSIONROM (1<<6)
+#define IORESOURCE_MEM_WARN (1<<7) /* WARN if requested by driver
*/
/* PnP I/O specific bits (IORESOURCE_BITS) */
#define IORESOURCE_IO_16BIT_ADDR (1<<0)
@@ -255,6 +256,5 @@ static inline bool resource_overlaps(struct resource *r1,
struct resource *r2)
return (r1->start <= r2->end && r1->end >= r2->start);
}
-
#endif /* __ASSEMBLY__ */
#endif /* _LINUX_IOPORT_H */
diff --git a/kernel/resource.c b/kernel/resource.c
index 19f2357..fca23ff 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -1075,8 +1075,13 @@ struct resource * __request_region(struct resource
*parent,
break;
if (conflict != parent) {
parent = conflict;
- if (!(conflict->flags & IORESOURCE_BUSY))
+ if (!(conflict->flags & IORESOURCE_BUSY)) {
+ if (conflict->flags & IORESOURCE_MEM_WARN)
+ pr_warn("request unknown region [mem
%#010llx-%#010llx] %s\n",
+ conflict->start, conflict->end,
+ conflict->name);
continue;
+ }
}
if (conflict->flags & flags & IORESOURCE_MUXED) {
add_wait_queue(&muxed_resource_wait, &wait);
--
1.9.3
--
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