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Message-Id: <200704020833.01290.bjorn.helgaas@hp.com>
Date: Mon, 2 Apr 2007 08:33:01 -0600
From: Bjorn Helgaas <bjorn.helgaas@...com>
To: Petr Vandrovec <petr@...drovec.name>
Cc: akpm@...l.org, ambx1@....rr.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Correctly report PnP 64bit resources
On Saturday 31 March 2007 03:12, Petr Vandrovec wrote:
> 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.
Your patch looks good to me.
> 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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