2006-08-31 23:34:14

by Aaron Durbin

Subject: [PATCH] x86_64: insert IOAPIC(s) and Local APIC into resource map

This patch places the IOAPIC(s) and the Local APIC specified by ACPI
tables into the resource map. The APICs will then be visible within
/proc/iomem

Signed-off-by: Aaron Durbin <[email protected]>

---


diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 2b8cef0..d9c677b 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -25,6 +25,7 @@ #include <linux/mc146818rtc.h>
#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>
@@ -43,6 +44,11 @@ int apic_calibrate_pmtmr __initdata;

int disable_apic_timer __initdata;

+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
@@ -638,6 +644,40 @@ 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;
+
+ res = alloc_bootmem(n);
+
+ if (!res)
+ return NULL;
+
+ memset(res, 0, n);
+ mem = (void *)&res[nr_ioapics];
+
+ for (i = 0; i < nr_ioapics; i++) {
+ res[i].name = mem;
+ res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
+ mem += IOAPIC_RESOURCE_NAME_SIZE;
+ }
+
+ return res;
+}
+#endif
+
void __init init_apic_mappings(void)
{
unsigned long apic_phys;
@@ -656,6 +696,11 @@ void __init init_apic_mappings(void)
set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
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).
@@ -666,7 +711,9 @@ #ifdef CONFIG_X86_IO_APIC
{
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;
@@ -678,6 +725,13 @@ #ifdef CONFIG_X86_IO_APIC
apic_printk(APIC_VERBOSE,"mapped IOAPIC to %016lx (%016lx)\n",
__fix_to_virt(idx), ioapic_phys);
idx++;
+
+ if (ioapic_res) {
+ ioapic_res->start = ioapic_phys;
+ ioapic_res->end = ioapic_phys + (4 * 1024) - 1;
+ insert_resource(&iomem_resource, ioapic_res);
+ ioapic_res++;
+ }
}
}
#endif

2006-09-01 08:21:36

by Andi Kleen

Subject: Re: [PATCH] x86_64: insert IOAPIC(s) and Local APIC into resource map

On Friday 01 September 2006 01:33, [email protected] wrote:
>
> This patch places the IOAPIC(s) and the Local APIC specified by ACPI
> tables into the resource map. The APICs will then be visible within
> /proc/iomem

Applied thanks

-Andi