[PATCH 3/4] x86, amd: Extend AMD northbridge caching code to support "Link Control" devices

[Hans Rosenfeld]

"Link Control" devices (NB function 4) will be used by L3 cache
partitioning on family 0x15.

Signed-off-by: Hans Rosenfeld <hans.rosenfeld@xxxxxxx>
---
 arch/x86/include/asm/amd_nb.h |    1 +
 arch/x86/kernel/amd_nb.c      |   11 +++++++++--
 include/linux/pci_ids.h       |    1 +
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h
index 6aee50d..b830c7f 100644
--- a/arch/x86/include/asm/amd_nb.h
+++ b/arch/x86/include/asm/amd_nb.h
@@ -15,6 +15,7 @@ extern int amd_scan_nodes(void);
 
 struct amd_northbridge {
 	struct pci_dev *misc;
+	struct pci_dev *link;
 };
 
 struct amd_northbridge_info {
diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
index 4ce87c2..aecf12f 100644
--- a/arch/x86/kernel/amd_nb.c
+++ b/arch/x86/kernel/amd_nb.c
@@ -20,6 +20,11 @@ struct pci_device_id amd_nb_misc_ids[] = {
 };
 EXPORT_SYMBOL(amd_nb_misc_ids);
 
+static struct pci_device_id amd_nb_link_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_LINK) },
+	{}
+};
+
 struct amd_northbridge_info amd_northbridges;
 EXPORT_SYMBOL(amd_northbridges);
 
@@ -38,7 +43,7 @@ int amd_cache_northbridges(void)
 {
 	int i = 0;
 	struct amd_northbridge *nb;
-	struct pci_dev *misc;
+	struct pci_dev *misc, *link;
 
 	if (amd_nb_num())
 		return 0;
@@ -57,10 +62,12 @@ int amd_cache_northbridges(void)
 	amd_northbridges.nb = nb;
 	amd_northbridges.num = i;
 
-	misc = NULL;
+	link = misc = NULL;
 	for (i = 0; i != amd_nb_num(); i++) {
 		node_to_amd_nb(i)->misc = misc =
 			next_northbridge(misc, amd_nb_misc_ids);
+		node_to_amd_nb(i)->link = link =
+			next_northbridge(link, amd_nb_link_ids);
         }
 
 	/* some CPU families (e.g. family 0x11) do not support GART */
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index c6bcfe9..dd8be13 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -518,6 +518,7 @@
 #define PCI_DEVICE_ID_AMD_11H_NB_MISC	0x1303
 #define PCI_DEVICE_ID_AMD_11H_NB_LINK	0x1304
 #define PCI_DEVICE_ID_AMD_15H_NB_MISC	0x1603
+#define PCI_DEVICE_ID_AMD_15H_NB_LINK	0x1604
 #define PCI_DEVICE_ID_AMD_LANCE		0x2000
 #define PCI_DEVICE_ID_AMD_LANCE_HOME	0x2001
 #define PCI_DEVICE_ID_AMD_SCSI		0x2020
-- 
1.5.6.5


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