[PATCH] x86/pci: insert ioapic resource before assign unassigned resource for pci -v2

Stephen reported that his DL585 G2 need noapic after 2.6.22 (?)

Dann bisected
  --------------------------------------------------------------------
  commit 30a18d6c3f1e774de656ebd8ff219d53e2ba4029
  Date:   Tue Feb 19 03:21:20 2008 -0800

      x86: multi pci root bus with different io resource range, on
      64-bit
  --------------------------------------------------------------------
caused the problem.

it turns out that
1. that AMD-based system has two HT chains.
2. BIOS doesn't allocate resource for BAR 6 of devices under 8132 etc
3. that multi-peer-root patche will try to split root resource to peer
   root resources according to pci conf of NB
4. pci assign unassigned code assign some range to pci-x bridge, but it
   is overlapping BAR that are used by ioapic addr of io4 and 8132.

the reason: at that point ioapic address are not inserted yet.

aka that patch is not the cause, and it just uncover other problems.

solution is trying to insert ioapic_resource early a little bit.

v2: update comments

Reported-by: Stephen Frost <sfrost@...>
Reported-and-Tested-by: dann frazier <dannf@...>
Signed-off-by: Yinghai Lu <yinghai@...>
Cc: stable@...

---
 arch/x86/include/asm/io_apic.h |    2 ++
 arch/x86/kernel/apic/io_apic.c |   14 +++-----------
 arch/x86/pci/i386.c            |    7 +++++++
 3 files changed, 12 insertions(+), 11 deletions(-)

Index: linux-2.6/arch/x86/include/asm/io_apic.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/io_apic.h
+++ linux-2.6/arch/x86/include/asm/io_apic.h
@@ -161,6 +161,7 @@ extern int io_apic_set_pci_routing(struc
  struct io_apic_irq_attr *irq_attr);
 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
 extern void ioapic_init_mappings(void);
+extern void ioapic_insert_resources(void);
 
 extern struct IO_APIC_route_entry **alloc_ioapic_entries(void);
 extern void free_ioapic_entries(struct IO_APIC_route_entry **ioapic_entries);
@@ -180,6 +181,7 @@ extern void ioapic_write_entry(int apic,
 #define io_apic_assign_pci_irqs 0
 static const int timer_through_8259 = 0;
 static inline void ioapic_init_mappings(void) { }
+static inline void ioapic_insert_resources(void) { }
 
 static inline void probe_nr_irqs_gsi(void) { }
 #endif
Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
+++ linux-2.6/arch/x86/kernel/apic/io_apic.c
@@ -4181,28 +4181,20 @@ fake_ioapic_page:
  }
 }
 
-static int __init ioapic_insert_resources(void)
+void __init ioapic_insert_resources(void)
 {
  int i;
  struct resource *r = ioapic_resources;
 
  if (!r) {
- if (nr_ioapics > 0) {
+ if (nr_ioapics > 0)
  printk(KERN_ERR
  "IO APIC resources couldn't be allocated.\n");
- return -1;
- }
- return 0;
+ return;
  }
 
  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);
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
@@ -35,6 +35,7 @@
 #include <asm/pat.h>
 #include <asm/e820.h>
 #include <asm/pci_x86.h>
+#include <asm/io_apic.h>
 
 
 static int
@@ -227,6 +228,12 @@ void __init pcibios_resource_survey(void
  pcibios_allocate_resources(1);
 
  e820_reserve_resources_late();
+ /*
+ * Insert the IO APIC resources after PCI initialization has
+ * occured to handle IO APICS that are mapped in on a BAR in
+ * PCI space, but before trying to assign unassigned pci res.
+ */
+ ioapic_insert_resources();
 }
 
 /**
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/