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Date: Fri, 18 Apr 2014 20:53:16 -0600
From: Myron Stowe <myron.stowe@...hat.com>
To: bhelgaas@...gle.com, linux-pci@...r.kernel.org
Cc: suravee.suthikulpanit@....com, aravind.gopalakrishnan@....com,
kim.naru@....com, andreas.herrmann3@....com, daniel@...ascale.com,
tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
x86@...nel.org, bp@...e.de, sp@...ascale.com,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/5] x86/PCI: Add support for generic AMD hostbridges
From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
AMD hostbridges gnenerally show up as PCI device 0:18.0. This patch adds
logic to automatically probe the device at this location and check PCI
device class code.
This patch supports platforms with the following AMD hostbridge types:
(K8, family10h, 11h, 12h, 14h 15h and 16h processors).
Reference(s):
https://bugzilla.kernel.org/show_bug.cgi?id=72051
Advanced Micro Devices (AMD), "BIOS and Kernel Developer's
Guide (BKDG) for AMD Family 15h Models 00h-0fh Processors." Section
3.4 Device [1F:18]h Function 1 Configuration Registers; D18F1x[EC:E0]
Configuration Map, 42301 Rev 3.12 - October 11, 2012.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Signed-off-by: Myron Stowe <myron.stowe@...hat.com>
Tested-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
---
arch/x86/pci/amd_bus.c | 71 ++++++++++++++++++++++++++++++++----------------
1 files changed, 47 insertions(+), 24 deletions(-)
diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c
index e88f4c5..c8cd75c 100644
--- a/arch/x86/pci/amd_bus.c
+++ b/arch/x86/pci/amd_bus.c
@@ -11,27 +11,34 @@
#include "bus_numa.h"
+#define AMD_NB_F0_NODE_ID 0x60
+#define AMD_NB_F0_UNIT_ID 0x64
+#define AMD_NB_F1_CONFIG_MAP_REG 0xe0
+
+#define RANGE_NUM 16
+#define AMD_NB_F1_CONFIG_MAP_RANGES 4
+
/*
- * This discovers the pcibus <-> node mapping on AMD K8.
- * also get peer root bus resource for io,mmio
+ * This discovers the pcibus <-> node mapping on AMD K8, Family 10h, 12h,
+ * 14h, 15h, and 16h processor based systems. This also gets peer root bus
+ * resources corresponding to I/O and MMIO addresses.
*/
-struct pci_hostbridge_probe {
+struct amd_hostbridge {
u32 bus;
u32 slot;
- u32 vendor;
u32 device;
};
-static struct pci_hostbridge_probe pci_probes[] __initdata = {
- { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1100 },
- { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1200 },
- { 0xff, 0, PCI_VENDOR_ID_AMD, 0x1200 },
- { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1300 },
+static struct amd_hostbridge hb_probes[] __initdata = {
+ /* Standard AMD Hostbriges are at bus 0x0 slot 0x18.
+ * In case of PCI_ANY_ID, the logic will try matching
+ * PCI_CLASS_BRIDGE_HOST instead.
+ */
+ { 0x0 , 0x18, PCI_ANY_ID },
+ { 0xff, 0 , PCI_DEVICE_ID_AMD_10H_NB_HT },
};
-#define RANGE_NUM 16
-
static struct pci_root_info __init *find_pci_root_info(int node, int link)
{
struct pci_root_info *info;
@@ -75,31 +82,47 @@ static int __init early_fill_mp_bus_info(void)
return -1;
found = false;
- for (i = 0; i < ARRAY_SIZE(pci_probes); i++) {
+ for (i = 0; i < ARRAY_SIZE(hb_probes); i++) {
u32 id;
u16 device;
u16 vendor;
+ u32 class;
- bus = pci_probes[i].bus;
- slot = pci_probes[i].slot;
+ bus = hb_probes[i].bus;
+ slot = hb_probes[i].slot;
id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
-
vendor = id & 0xffff;
device = (id>>16) & 0xffff;
- if (pci_probes[i].vendor == vendor &&
- pci_probes[i].device == device) {
- found = true;
- break;
+ class = read_pci_config(bus, slot, 0,
+ PCI_CLASS_REVISION) >> 16;
+
+ if (PCI_VENDOR_ID_AMD == vendor) {
+ if (hb_probes[i].device == device) {
+ found = true;
+ break;
+ }
+
+ if ((hb_probes[i].device == PCI_ANY_ID) &&
+ (class == PCI_CLASS_BRIDGE_HOST)) {
+ hb_probes[i].device = device;
+ found = true;
+ break;
+ }
}
}
- if (!found)
+ if (!found) {
+ pr_warn("AMD hostbridge not found\n");
return 0;
+ }
- for (i = 0; i < 4; i++) {
+ pr_debug("Found AMD hostbridge at %x:%x.0\n", bus, slot);
+
+ for (i = 0; i < AMD_NB_F1_CONFIG_MAP_RANGES; i++) {
int min_bus;
int max_bus;
- reg = read_pci_config(bus, slot, 1, 0xe0 + (i << 2));
+ reg = read_pci_config(bus, slot, 1,
+ AMD_NB_F1_CONFIG_MAP_REG + (i << 2));
/* Check if that register is enabled for bus range */
if ((reg & 7) != 3)
@@ -114,9 +137,9 @@ static int __init early_fill_mp_bus_info(void)
}
/* get the default node and link for left over res */
- reg = read_pci_config(bus, slot, 0, 0x60);
+ reg = read_pci_config(bus, slot, 0, AMD_NB_F0_NODE_ID);
def_node = (reg >> 8) & 0x07;
- reg = read_pci_config(bus, slot, 0, 0x64);
+ reg = read_pci_config(bus, slot, 0, AMD_NB_F0_UNIT_ID);
def_link = (reg >> 8) & 0x03;
memset(range, 0, sizeof(range));
--
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