[PATCH] x86-64: Insert Local and IO APIC(s) into resource map

Insert the Local APIC and IO APIC(s) into the resource tree.  It allows the
APIC resources to be visible within /proc/iomem.  The patch also takes into
account IO APIC(s) mapped in the PCI space by deferring the insertion until
after PCI has allocated its necessary resources.

Signed-off-by: Aaron Durbin <adurbin@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@muc.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>

1 files changed, 78 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 4d9d5ed942b2..5c468971e645 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -25,6 +25,7 @@
 #include <linux/kernel_stat.h>
 #include <linux/sysdev.h>
 #include <linux/module.h>
+#include <linux/ioport.h>
 
 #include <asm/atomic.h>
 #include <asm/smp.h>
@@ -45,6 +46,12 @@ int apic_calibrate_pmtmr __initdata;
 
 int disable_apic_timer __initdata;
 
+static struct resource *ioapic_resources;
+static struct resource lapic_resource = {
+        .name = "Local APIC",
+        .flags = IORESOURCE_MEM | IORESOURCE_BUSY,
+};
+
 /*
  * cpu_mask that denotes the CPUs that needs timer interrupt coming in as
  * IPIs in place of local APIC timers
@@ -585,6 +592,64 @@ static int __init detect_init_APIC (void)
         return 0;
 }
 
+#ifdef CONFIG_X86_IO_APIC
+static struct resource * __init ioapic_setup_resources(void)
+{
+#define IOAPIC_RESOURCE_NAME_SIZE 11
+        unsigned long n;
+        struct resource *res;
+        char *mem;
+        int i;
+
+        if (nr_ioapics <= 0)
+                return NULL;
+
+        n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
+        n *= nr_ioapics;
+
+        mem = alloc_bootmem(n);
+        res = (void *)mem;
+
+        if (mem != NULL) {
+                memset(mem, 0, n);
+                mem += sizeof(struct resource) * nr_ioapics;
+
+                for (i = 0; i < nr_ioapics; i++) {
+                        res[i].name = mem;
+                        res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+                        sprintf(mem,  "IOAPIC %u", i);
+                        mem += IOAPIC_RESOURCE_NAME_SIZE;
+                }
+        }
+
+        ioapic_resources = res;
+
+        return res;
+}
+
+static int __init ioapic_insert_resources(void)
+{
+        int i;
+        struct resource *r = ioapic_resources;
+
+        if (!r) {
+                printk("IO APIC resources could be not be allocated.\n");
+                return -1;
+        }
+
+        for (i = 0; i < nr_ioapics; i++) {
+                insert_resource(&iomem_resource, r);
+                r++;
+        }
+
+        return 0;
+}
+
+/* Insert the IO APIC resources after PCI initialization has occured to handle
+ * IO APICS that are mapped in on a BAR in PCI space. */
+late_initcall(ioapic_insert_resources);
+#endif
+
 void __init init_apic_mappings(void)
 {
         unsigned long apic_phys;
@@ -604,6 +669,11 @@ void __init init_apic_mappings(void)
         apic_mapped = 1;
         apic_printk(APIC_VERBOSE,"mapped APIC to %16lx (%16lx)\n", APIC_BASE, apic_phys);
 
+        /* Put local APIC into the resource map. */
+        lapic_resource.start = apic_phys;
+        lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1;
+        insert_resource(&iomem_resource, &lapic_resource);
+
         /*
          * Fetch the APIC ID of the BSP in case we have a
          * default configuration (or the MP table is broken).
@@ -613,7 +683,9 @@ void __init init_apic_mappings(void)
         {
                 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
                 int i;
+                struct resource *ioapic_res;
 
+                ioapic_res = ioapic_setup_resources();
                 for (i = 0; i < nr_ioapics; i++) {
                         if (smp_found_config) {
                                 ioapic_phys = mp_ioapics[i].mpc_apicaddr;
@@ -625,6 +697,12 @@ void __init init_apic_mappings(void)
                         apic_printk(APIC_VERBOSE,"mapped IOAPIC to %016lx (%016lx)\n",
                                         __fix_to_virt(idx), ioapic_phys);
                         idx++;
+
+                        if (ioapic_res != NULL) {
+                                ioapic_res->start = ioapic_phys;
+                                ioapic_res->end = ioapic_phys + (4 * 1024) - 1;
+                                ioapic_res++;
+                        }
                 }
         }
 }