x86: split e820 reserved entries record to late v4

this one replaces:

| commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd
| Author: Yinghai Lu <yhlu.kernel@gmail.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
v4: address Linus's review about comments and condition in _late()

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 11 insertions, 81 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 523d6c5605d1..a7a71339bfb0 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -1271,12 +1271,12 @@ static inline const char *e820_type_to_string(int e820_type)
 /*
  * Mark e820 reserved areas as busy for the resource manager.
  */
-struct resource __initdata *e820_res;
+static struct resource __initdata *e820_res;
 void __init e820_reserve_resources(void)
 {
         int i;
-        u64 end;
         struct resource *res;
+        u64 end;
 
         res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
         e820_res = res;
@@ -1293,6 +1293,12 @@ void __init e820_reserve_resources(void)
                 res->end = end;
 
                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+
+                /*
+                 * 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++;
@@ -1313,7 +1319,7 @@ void __init e820_reserve_resources_late(void)
 
         res = e820_res;
         for (i = 0; i < e820.nr_map; i++) {
-                if (e820.map[i].type == E820_RESERVED && res->start >= (1ULL<<20))
+                if (!res->parent && res->end)
                         insert_resource(&iomem_resource, res);
                 res++;
         }
diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 40811efaa25a..844df0cbbd3e 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -31,11 +31,8 @@
 #include <linux/ioport.h>
 #include <linux/errno.h>
 #include <linux/bootmem.h>
-#include <linux/acpi.h>
 
 #include <asm/pat.h>
-#include <asm/hpet.h>
-#include <asm/io_apic.h>
 #include <asm/e820.h>
 
 #include "pci.h"
@@ -81,77 +78,6 @@ pcibios_align_resource(void *data, struct resource *res,
 }
 EXPORT_SYMBOL(pcibios_align_resource);
 
-static int check_res_with_valid(struct pci_dev *dev, struct resource *res)
-{
-        unsigned long base;
-        unsigned long size;
-        int i;
-
-        base = res->start;
-        size = (res->start == 0 && res->end == res->start) ? 0 :
-                 (res->end - res->start + 1);
-
-        if (!base || !size)
-                return 0;
-
-#ifdef CONFIG_HPET_TIMER
-        /* for hpet */
-        if (base == hpet_address && (res->flags & IORESOURCE_MEM)) {
-                dev_info(&dev->dev, "BAR has HPET at %08lx-%08lx\n",
-                                 base, base + size - 1);
-                return 1;
-        }
-#endif
-
-#ifdef CONFIG_X86_IO_APIC
-        for (i = 0; i < nr_ioapics; i++) {
-                unsigned long ioapic_phys = mp_ioapics[i].mp_apicaddr;
-
-                if (base == ioapic_phys && (res->flags & IORESOURCE_MEM)) {
-                        dev_info(&dev->dev, "BAR has ioapic at %08lx-%08lx\n",
-                                         base, base + size - 1);
-                        return 1;
-                }
-        }
-#endif
-
-#ifdef CONFIG_PCI_MMCONFIG
-        for (i = 0; i < pci_mmcfg_config_num; i++) {
-                unsigned long addr;
-
-                addr = pci_mmcfg_config[i].address;
-                if (base == addr && (res->flags & IORESOURCE_MEM)) {
-                        dev_info(&dev->dev, "BAR has MMCONFIG at %08lx-%08lx\n",
-                                         base, base + size - 1);
-                        return 1;
-                }
-        }
-#endif
-
-        return 0;
-}
-
-static int check_platform(struct pci_dev *dev, struct resource *res)
-{
-        struct resource *root = NULL;
-
-        /*
-         * forcibly insert it into the
-         * resource tree
-         */
-        if (res->flags & IORESOURCE_MEM)
-                root = &iomem_resource;
-        else if (res->flags & IORESOURCE_IO)
-                root = &ioport_resource;
-
-        if (root && check_res_with_valid(dev, res)) {
-                insert_resource(root, res);
-
-                return 1;
-        }
-
-        return 0;
-}
 /*
  *  Handle resources of PCI devices.  If the world were perfect, we could
  *  just allocate all the resource regions and do nothing more.  It isn't.
@@ -203,8 +129,6 @@ static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
                                 pr = pci_find_parent_resource(dev, r);
                                 if (!r->start || !pr ||
                                     request_resource(pr, r) < 0) {
-                                        if (check_platform(dev, r))
-                                                continue;
                                         dev_err(&dev->dev, "BAR %d: can't allocate resource\n", idx);
                                         /*
                                          * Something is wrong with the region.
@@ -246,8 +170,6 @@ static void __init pcibios_allocate_resources(int pass)
                                         r->flags, disabled, pass);
                                 pr = pci_find_parent_resource(dev, r);
                                 if (!pr || request_resource(pr, r) < 0) {
-                                        if (check_platform(dev, r))
-                                                continue;
                                         dev_err(&dev->dev, "BAR %d: can't allocate resource\n", idx);
                                         /* We'll assign a new address later */
                                         r->end -= r->start;
@@ -306,6 +228,8 @@ 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();
 }
 
 /**