[PATCH] x86_64: set cfg_size for AMD Family 10h in case MMCONFIG isused

[Yinghai Lu]

[PATCH] x86_64: set cfg_size for AMD Family 10h in case MMCONFIG is used.

reuse pci_cfg_space_size but skip check pci express and pci-x CAP ID.

Signed-off-by: Yinghai Lu <yinghai.lu@xxxxxxx>

 arch/i386/pci/fixup.c |   13 +++++++++++++
 drivers/pci/probe.c   |   11 ++++++++++-
 include/linux/pci.h   |    1 +
 3 files changed, 24 insertions(+), 1 deletion(-)

===================================================================
Index: linux-2.6/arch/i386/pci/fixup.c
===================================================================
--- linux-2.6.orig/arch/i386/pci/fixup.c	2007-09-12 19:00:56.000000000 -0700
+++ linux-2.6/arch/i386/pci/fixup.c	2007-09-12 19:01:32.000000000 -0700
@@ -444,3 +444,16 @@
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SIEMENS, 0x0015,
 			  pci_siemens_interrupt_controller);
+
+/**
+ * Regular PCI devices have 256 bytes, but AMD Family 10h Opteron ext config
+ * have 4096 bytes.  Even if the device is capable, that doesn't mean we can
+ * access it.  Maybe we don't have a way to generate extended config space
+ * accesses.   So check it
+ */
+static void fam10h_pci_cfg_space_size(struct pci_dev *dev)
+{
+        dev->cfg_size = pci_cfg_space_size_ext(dev, 0);
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_ANY_ID, fam10h_pci_cfg_space_size);
Index: linux-2.6/drivers/pci/probe.c
===================================================================
--- linux-2.6.orig/drivers/pci/probe.c	2007-09-12 19:00:56.000000000 -0700
+++ linux-2.6/drivers/pci/probe.c	2007-09-12 19:01:32.000000000 -0700
@@ -831,11 +831,14 @@
  * reading the dword at 0x100 which must either be 0 or a valid extended
  * capability header.
  */
-int pci_cfg_space_size(struct pci_dev *dev)
+int pci_cfg_space_size_ext(struct pci_dev *dev, unsigned check_exp_pcix)
 {
 	int pos;
 	u32 status;
 
+	if (!check_exp_pcix)
+		goto skip;
+
 	pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
 	if (!pos) {
 		pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
@@ -847,6 +850,7 @@
 			goto fail;
 	}
 
+ skip:
 	if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
 		goto fail;
 	if (status == 0xffffffff)
@@ -858,6 +862,11 @@
 	return PCI_CFG_SPACE_SIZE;
 }
 
+int pci_cfg_space_size(struct pci_dev *dev)
+{
+	return pci_cfg_space_size_ext(dev, 1);
+}
+
 static void pci_release_bus_bridge_dev(struct device *dev)
 {
 	kfree(dev);
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h	2007-09-12 19:00:56.000000000 -0700
+++ linux-2.6/include/linux/pci.h	2007-09-12 19:01:32.000000000 -0700
@@ -626,6 +626,7 @@
 
 void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
 		  void *userdata);
+int pci_cfg_space_size_ext(struct pci_dev *dev, unsigned check_exp_pcix);
 int pci_cfg_space_size(struct pci_dev *dev);
 unsigned char pci_bus_max_busnr(struct pci_bus* bus);
 
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