Messages in this thread | | | Date | Tue, 24 Feb 2015 09:04:40 -0800 | Subject | Re: [PATCH 2/3 v4] resource: Add new flag IORESOURCE_MEM_WARN | From | Dan Williams <> |
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On Tue, Feb 24, 2015 at 7:00 AM, Boaz Harrosh <boaz@plexistor.com> wrote: > > Resource providers set this flag if they want > that request_region will print a warning in dmesg > if this particular memory resource is locked by a driver. > > Thous acting as a Protocol Police about experimental > devices that did not pass a committee approval. > > The Only user of this flag is x86/kernel/e820.c that > wants to WARN about UNKNOWN memory types. > > NOTE: It would be preferred if I defined a general flag say > IORESOURCE_WARN, where any kind of resource provider > can WARN on use, but we have run out of flags in the > 32bit long systems. So I defined a free bit from the > resource specific flags for mem resources. This is > why I need to check if this is a memory resource first > so not to conflict with other resource specific flags. > (Though actually no one is using this specific bit) > > CC: Thomas Gleixner <tglx@linutronix.de> > CC: Ingo Molnar <mingo@redhat.com> > CC: "H. Peter Anvin" <hpa@zytor.com> > CC: x86@kernel.org > CC: Dan Williams <dan.j.williams@intel.com> > CC: Andrew Morton <akpm@linux-foundation.org> > CC: Bjorn Helgaas <bhelgaas@google.com> > CC: Vivek Goyal <vgoyal@redhat.com> > Signed-off-by: Boaz Harrosh <boaz@plexistor.com> > --- > arch/x86/kernel/e820.c | 3 +++ > include/linux/ioport.h | 1 + > kernel/resource.c | 9 ++++++++- > 3 files changed, 12 insertions(+), 1 deletion(-) > > 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..f78972b 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) > diff --git a/kernel/resource.c b/kernel/resource.c > index 19f2357..4bab16f 100644 > --- a/kernel/resource.c > +++ b/kernel/resource.c > @@ -1075,8 +1075,15 @@ struct resource * __request_region(struct resource *parent, > break; > if (conflict != parent) { > parent = conflict; > - if (!(conflict->flags & IORESOURCE_BUSY)) > + if (!(conflict->flags & IORESOURCE_BUSY)) { > + if (unlikely(
No need for unlikely(), this isn't a hot path.
> + (resource_type(conflict) == IORESOURCE_MEM) > + && (conflict->flags & IORESOURCE_MEM_WARN))) > + pr_warn("request region with unknown memory type [mem %#010llx-%#010llx] %s\n", > + conflict->start, conflict->end, > + conflict->name);
I think this should also dump the res->name to identify who is requesting it.
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