Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well as x86_32

[Yinghai <yinghai.lu@oracle.com>]

On 04/12/2010 11:54 AM, Andy Isaacson wrote:
> On Fri, Apr 09, 2010 at 07:46:04PM -0700, Yinghai wrote:
> [    5.463672] ahci 0000:00:1f.2: PCI INT C -> GSI 20 (level, low) -> IRQ 20
> [    5.470633] ahci 0000:00:1f.2: BAR 5: can't reserve [mem 0x000a0000-0x000a07ff]
> [    5.478257] ahci: probe of 0000:00:1f.2 failed with error -16

please check

[PATCH] x86,pci, acpi: Inherent BUSY flag when setup_resource for root bus

So make pci root resource from _CRS honor the range We reserve in e820 below 1M
then  will not assign them to unsigned pci BAR

-v2: let pci_bus_alloc_resource() honor IORESOURCE_BUSY
     driver can not use those range, so skip it

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
 arch/x86/pci/acpi.c |    4 ++++
 drivers/pci/bus.c   |    4 ++++
 2 files changed, 8 insertions(+)

Index: linux-2.6/arch/x86/pci/acpi.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/acpi.c
+++ linux-2.6/arch/x86/pci/acpi.c
@@ -175,6 +175,10 @@ setup_resource(struct acpi_resource *acp
 			"conflicts with %s %pR\n",
 			res, conflict->name, conflict);
 	} else {
+		/* In case it falls in big reserved region */
+		if (res->parent->flags & IORESOURCE_BUSY)
+			res->flags |= IORESOURCE_BUSY;
+
 		pci_bus_add_resource(info->bus, res, 0);
 		info->res_num++;
 		if (addr.translation_offset)
Index: linux-2.6/drivers/pci/bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/bus.c
+++ linux-2.6/drivers/pci/bus.c
@@ -103,6 +103,10 @@ pci_bus_alloc_resource(struct pci_bus *b
 		if (!r)
 			continue;
 
+		/* Driver can not reserve it later, so don't use it */
+		if (r->flags & IORESOURCE_BUSY)
+			continue;
+
 		/* type_mask must match */
 		if ((res->flags ^ r->flags) & type_mask)
 			continue;