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Date: Sat, 31 Mar 2007 11:12:37 +0200
From: Petr Vandrovec <petr@...drovec.name>
To: akpm@...l.org
Cc: ambx1@....rr.com, bjorn.helgaas@...com,
linux-kernel@...r.kernel.org
Subject: [PATCH] Correctly report PnP 64bit resources
Hello,
today I noticed that kernel with 64bit I/O resources reports
incorrect /proc/iomem due to resource_size_t => int => resource_size_t
conversion in drivers/pnp/system.c, turning addresses 2-4GB into
very huge addresses at the top of 64bit address space.
Differences between old and new /proc/iomem and dmesg are below, as well
as a patch (for current git tree). After this change kernel with 64bit
resources now reports same errors as one built with 32bit resources only -
- which is apparently correct behavior.
If you are interested, these ranges failed to be reserved:
ceee0000-ceefffff are ACPI tables,
cf000000-cfffffff is shared memory for on-board videocard,
f0000000-f3ffffff is MMCONFIG, and
feff0000-feff00ff is part of HPET (seems to be violation of spec)
--- memres-before 2007-03-31 01:41:40.000000000 -0700
+++ memres-after 2007-03-31 01:43:47.000000000 -0700
@@ -48,12 +48,8 @@
fe02f000-fe02ffff : ohci_hcd
fec00000-fec00fff : IOAPIC 0
fee00000-fee00fff : Local APIC
+fefe0000-fefe01ff : pnp 00:01
+fefe1000-fefe10ff : pnp 00:01
feff0000-feff03ff : HPET 0
+ffff0000-ffffffff : pnp 00:0c
100000000-12fffffff : System RAM
-ffffffffceee0000-ffffffffceefffff : pnp 00:0c
-ffffffffcf000000-ffffffffcfffffff : pnp 00:01
-fffffffff0000000-fffffffff3ffffff : pnp 00:0b
-fffffffffefe0000-fffffffffefe01ff : pnp 00:01
-fffffffffefe1000-fffffffffefe10ff : pnp 00:01
-fffffffffeff0000-fffffffffeff00ff : pnp 00:0c
-ffffffffffff0000-ffffffffffffffff : pnp 00:0c
--- dmesg-before 2007-03-31 00:18:50.000000000 -0700
+++ dmesg-after 2007-03-31 01:46:20.000000000 -0700
@@ -225,11 +225,11 @@
pnp: 00:01: iomem range 0x0-0x0 could not be reserved
pnp: 00:01: iomem range 0xfefe0000-0xfefe01ff has been reserved
pnp: 00:01: iomem range 0xfefe1000-0xfefe10ff has been reserved
-pnp: 00:01: iomem range 0xcf000000-0xcfffffff has been reserved
-pnp: 00:0b: iomem range 0xf0000000-0xf3ffffff has been reserved
+pnp: 00:01: iomem range 0xcf000000-0xcfffffff could not be reserved
+pnp: 00:0b: iomem range 0xf0000000-0xf3ffffff could not be reserved
pnp: 00:0c: iomem range 0xf0000-0xfffff could not be reserved
-pnp: 00:0c: iomem range 0xfeff0000-0xfeff00ff has been reserved
-pnp: 00:0c: iomem range 0xceee0000-0xceefffff has been reserved
+pnp: 00:0c: iomem range 0xfeff0000-0xfeff00ff could not be reserved
+pnp: 00:0c: iomem range 0xceee0000-0xceefffff could not be reserved
pnp: 00:0c: iomem range 0xffff0000-0xffffffff has been reserved
PCI: Bridge: 0000:00:04.0
IO window: b000-bfff
Thanks,
Petr Vandrovec
----
Change PnP resource handling code to use proper type for resource start and length.
Fixes bogus regions reported in /proc/iomem.
I've also made some pointer constant, as they are constant...
Signed-off-by: Petr Vandrovec <petr@...drovec.name>
diff -uprdN linux/drivers/pnp/system.c linux/drivers/pnp/system.c
--- linux/drivers/pnp/system.c 2007-03-30 22:31:34.000000000 -0700
+++ linux/drivers/pnp/system.c 2007-03-31 01:40:03.000000000 -0700
@@ -22,7 +22,7 @@ static const struct pnp_device_id pnp_de
{ "", 0 }
};
-static void reserve_range(char *pnpid, int start, int end, int port)
+static void reserve_range(const char *pnpid, resource_size_t start, resource_size_t end, int port)
{
struct resource *res;
char *regionid;
@@ -32,9 +32,9 @@ static void reserve_range(char *pnpid, i
return;
snprintf(regionid, 16, "pnp %s", pnpid);
if (port)
- res = request_region(start,end-start+1,regionid);
+ res = request_region(start, end-start+1, regionid);
else
- res = request_mem_region(start,end-start+1,regionid);
+ res = request_mem_region(start, end-start+1, regionid);
if (res == NULL)
kfree(regionid);
else
@@ -45,12 +45,13 @@ static void reserve_range(char *pnpid, i
* have double reservations.
*/
printk(KERN_INFO
- "pnp: %s: %s range 0x%x-0x%x %s reserved\n",
- pnpid, port ? "ioport" : "iomem", start, end,
+ "pnp: %s: %s range 0x%llx-0x%llx %s reserved\n",
+ pnpid, port ? "ioport" : "iomem",
+ (unsigned long long)start, (unsigned long long)end,
NULL != res ? "has been" : "could not be");
}
-static void reserve_resources_of_dev(struct pnp_dev *dev)
+static void reserve_resources_of_dev(const struct pnp_dev *dev)
{
int i;
-
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