linux-kernel - Re: [PATCH] x86: split e820 reserved entries record to late v4

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Date:	Sat, 30 Aug 2008 19:18:42 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Ivan Kokshaysky" <ink@...assic.park.msu.ru>
Cc:	linux-kernel@...r.kernel.org, "Yinghai Lu" <yhlu.kernel@...il.com>
Subject: Re: [PATCH] x86: split e820 reserved entries record to late v4

add to: Ivan.

On Sat, Aug 30, 2008 at 1:36 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
> Linus said we should register some entries in e820 later,
> so could let BAR res register at first, or even pnp?
>
> this one replace
> | commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd
> | Author: Yinghai Lu <yhlu.kernel@...il.com>
> | Date:   Mon Aug 25 00:56:08 2008 -0700
> |
> |    x86: fix HPET regression in 2.6.26 versus 2.6.25, check hpet against BAR, v3
>
> v2: insert e820 reserve resources before pnp_system_init
> v3: fix merging problem in tip/x86/core
>    please drop the one in tip/x86/core use this one instead
> v4: address Linus's review about comments and condition in _late()
>
> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
>
> ---
>  arch/x86/kernel/e820.c |   24 +++++++++++++++++++++++-
>  arch/x86/pci/i386.c    |    3 +++
>  include/asm-x86/e820.h |    1 +
>  3 files changed, 27 insertions(+), 1 deletion(-)
>
> Index: linux-2.6/arch/x86/kernel/e820.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/e820.c
> +++ linux-2.6/arch/x86/kernel/e820.c
> @@ -1267,6 +1267,7 @@ static inline const char *e820_type_to_s
>  /*
>  * Mark e820 reserved areas as busy for the resource manager.
>  */
> +static struct resource __initdata *e820_res;
>  void __init e820_reserve_resources(void)
>  {
>        int i;
> @@ -1274,6 +1275,7 @@ void __init e820_reserve_resources(void)
>        u64 end;
>
>        res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
> +       e820_res = res;
>        for (i = 0; i < e820.nr_map; i++) {
>                end = e820.map[i].addr + e820.map[i].size - 1;
>  #ifndef CONFIG_RESOURCES_64BIT
> @@ -1287,7 +1289,14 @@ void __init e820_reserve_resources(void)
>                res->end = end;
>
>                res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
> -               insert_resource(&iomem_resource, res);
> +
> +               /*
> +                * don't register the region that could be conflicted with
> +                * pci device BAR resource and insert them later in
> +                * pcibios_resource_survey()
> +                */
> +               if (e820.map[i].type != E820_RESERVED || res->start < (1ULL<<20))
> +                       insert_resource(&iomem_resource, res);
>                res++;
>        }
>
> @@ -1299,6 +1308,19 @@ void __init e820_reserve_resources(void)
>        }
>  }
>
> +void __init e820_reserve_resources_late(void)
> +{
> +       int i;
> +       struct resource *res;
> +
> +       res = e820_res;
> +       for (i = 0; i < e820.nr_map; i++) {
> +               if (!res->parent && res->end)
> +                       insert_resource(&iomem_resource, res);
> +               res++;
> +       }
> +}
> +
>  char *__init default_machine_specific_memory_setup(void)
>  {
>        char *who = "BIOS-e820";
> Index: linux-2.6/arch/x86/pci/i386.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/pci/i386.c
> +++ linux-2.6/arch/x86/pci/i386.c
> @@ -33,6 +33,7 @@
>  #include <linux/bootmem.h>
>
>  #include <asm/pat.h>
> +#include <asm/e820.h>
>
>  #include "pci.h"
>
> @@ -230,6 +231,8 @@ void __init pcibios_resource_survey(void
>        pcibios_allocate_bus_resources(&pci_root_buses);
>        pcibios_allocate_resources(0);
>        pcibios_allocate_resources(1);
> +
> +       e820_reserve_resources_late();
>  }
>
>  /**
> Index: linux-2.6/include/asm-x86/e820.h
> ===================================================================
> --- linux-2.6.orig/include/asm-x86/e820.h
> +++ linux-2.6/include/asm-x86/e820.h
> @@ -120,6 +120,7 @@ extern void e820_register_active_regions
>  extern u64 e820_hole_size(u64 start, u64 end);
>  extern void finish_e820_parsing(void);
>  extern void e820_reserve_resources(void);
> +extern void e820_reserve_resources_late(void);
>  extern void setup_memory_map(void);
>  extern char *default_machine_specific_memory_setup(void);
>  extern char *machine_specific_memory_setup(void);
>
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