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Date: Wed, 16 Nov 2016 11:53:23 -0800
From: tip-bot for Yazen Ghannam <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: bp@...e.de, tglx@...utronix.de, hpa@...or.com, x86@...nel.org,
Yazen.Ghannam@....com, linux-kernel@...r.kernel.org,
linux-edac@...r.kernel.org, mingo@...nel.org
Subject: [tip:ras/core] x86/amd_nb: Add SMN and Indirect Data Fabric access
for AMD Fam17h
Commit-ID: ddfe43cdc0da3189feac4bb9f0f818bef6d6e56e
Gitweb: http://git.kernel.org/tip/ddfe43cdc0da3189feac4bb9f0f818bef6d6e56e
Author: Yazen Ghannam <Yazen.Ghannam@....com>
AuthorDate: Thu, 10 Nov 2016 15:10:56 -0600
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 16 Nov 2016 20:46:38 +0100
x86/amd_nb: Add SMN and Indirect Data Fabric access for AMD Fam17h
Some devices on Fam17h can only be accessed through the System Management
Network (SMN). The SMN is accessed by a pair of index/data registers in PCI
config space. Add a pair of functions to read from and write to the SMN.
The Data Fabric on Fam17h allows multiple devices to use the same register
space. The registers of a specific device are accessed indirectly using the
device's DF InstanceId. Currently, we only need to read from these devices,
so only define a read function for now.
Signed-off-by: Yazen Ghannam <Yazen.Ghannam@....com>
Cc: linux-edac <linux-edac@...r.kernel.org>
Cc: x86-ml <x86@...nel.org>
Link: http://lkml.kernel.org/r/1478812257-5424-5-git-send-email-Yazen.Ghannam@amd.com
[ Boris: make __amd_smn_rw() even more compact. ]
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
arch/x86/include/asm/amd_nb.h | 5 ++
arch/x86/kernel/amd_nb.c | 108 +++++++++++++++++++++++++++++++++++++++++-
2 files changed, 111 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h
index b442ad7..00c88a0 100644
--- a/arch/x86/include/asm/amd_nb.h
+++ b/arch/x86/include/asm/amd_nb.h
@@ -21,6 +21,10 @@ extern int amd_numa_init(void);
extern int amd_get_subcaches(int);
extern int amd_set_subcaches(int, unsigned long);
+extern int amd_smn_read(u16 node, u32 address, u32 *value);
+extern int amd_smn_write(u16 node, u32 address, u32 value);
+extern int amd_df_indirect_read(u16 node, u8 func, u16 reg, u8 instance_id, u32 *lo);
+
struct amd_l3_cache {
unsigned indices;
u8 subcaches[4];
@@ -55,6 +59,7 @@ struct threshold_bank {
};
struct amd_northbridge {
+ struct pci_dev *root;
struct pci_dev *misc;
struct pci_dev *link;
struct amd_l3_cache l3_cache;
diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
index 86c2cec..458da85 100644
--- a/arch/x86/kernel/amd_nb.c
+++ b/arch/x86/kernel/amd_nb.c
@@ -13,11 +13,20 @@
#include <linux/spinlock.h>
#include <asm/amd_nb.h>
+#define PCI_DEVICE_ID_AMD_17H_ROOT 0x1450
#define PCI_DEVICE_ID_AMD_17H_DF_F3 0x1463
#define PCI_DEVICE_ID_AMD_17H_DF_F4 0x1464
+/* Protect the PCI config register pairs used for SMN and DF indirect access. */
+static DEFINE_MUTEX(smn_mutex);
+
static u32 *flush_words;
+static const struct pci_device_id amd_root_ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_ROOT) },
+ {}
+};
+
const struct pci_device_id amd_nb_misc_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
@@ -80,11 +89,104 @@ static struct pci_dev *next_northbridge(struct pci_dev *dev,
return dev;
}
+static int __amd_smn_rw(u16 node, u32 address, u32 *value, bool write)
+{
+ struct pci_dev *root;
+ int err = -ENODEV;
+
+ if (node >= amd_northbridges.num)
+ goto out;
+
+ root = node_to_amd_nb(node)->root;
+ if (!root)
+ goto out;
+
+ mutex_lock(&smn_mutex);
+
+ err = pci_write_config_dword(root, 0x60, address);
+ if (err) {
+ pr_warn("Error programming SMN address 0x%x.\n", address);
+ goto out_unlock;
+ }
+
+ err = (write ? pci_write_config_dword(root, 0x64, *value)
+ : pci_read_config_dword(root, 0x64, value));
+ if (err)
+ pr_warn("Error %s SMN address 0x%x.\n",
+ (write ? "writing to" : "reading from"), address);
+
+out_unlock:
+ mutex_unlock(&smn_mutex);
+
+out:
+ return err;
+}
+
+int amd_smn_read(u16 node, u32 address, u32 *value)
+{
+ return __amd_smn_rw(node, address, value, false);
+}
+EXPORT_SYMBOL_GPL(amd_smn_read);
+
+int amd_smn_write(u16 node, u32 address, u32 value)
+{
+ return __amd_smn_rw(node, address, &value, true);
+}
+EXPORT_SYMBOL_GPL(amd_smn_write);
+
+/*
+ * Data Fabric Indirect Access uses FICAA/FICAD.
+ *
+ * Fabric Indirect Configuration Access Address (FICAA): Constructed based
+ * on the device's Instance Id and the PCI function and register offset of
+ * the desired register.
+ *
+ * Fabric Indirect Configuration Access Data (FICAD): There are FICAD LO
+ * and FICAD HI registers but so far we only need the LO register.
+ */
+int amd_df_indirect_read(u16 node, u8 func, u16 reg, u8 instance_id, u32 *lo)
+{
+ struct pci_dev *F4;
+ u32 ficaa;
+ int err = -ENODEV;
+
+ if (node >= amd_northbridges.num)
+ goto out;
+
+ F4 = node_to_amd_nb(node)->link;
+ if (!F4)
+ goto out;
+
+ ficaa = 1;
+ ficaa |= reg & 0x3FC;
+ ficaa |= (func & 0x7) << 11;
+ ficaa |= instance_id << 16;
+
+ mutex_lock(&smn_mutex);
+
+ err = pci_write_config_dword(F4, 0x5C, ficaa);
+ if (err) {
+ pr_warn("Error writing DF Indirect FICAA, FICAA=0x%x\n", ficaa);
+ goto out_unlock;
+ }
+
+ err = pci_read_config_dword(F4, 0x98, lo);
+ if (err)
+ pr_warn("Error reading DF Indirect FICAD LO, FICAA=0x%x.\n", ficaa);
+
+out_unlock:
+ mutex_unlock(&smn_mutex);
+
+out:
+ return err;
+}
+EXPORT_SYMBOL_GPL(amd_df_indirect_read);
+
int amd_cache_northbridges(void)
{
u16 i = 0;
struct amd_northbridge *nb;
- struct pci_dev *misc, *link;
+ struct pci_dev *root, *misc, *link;
if (amd_northbridges.num)
return 0;
@@ -103,8 +205,10 @@ int amd_cache_northbridges(void)
amd_northbridges.nb = nb;
amd_northbridges.num = i;
- link = misc = NULL;
+ link = misc = root = NULL;
for (i = 0; i != amd_northbridges.num; i++) {
+ node_to_amd_nb(i)->root = root =
+ next_northbridge(root, amd_root_ids);
node_to_amd_nb(i)->misc = misc =
next_northbridge(misc, amd_nb_misc_ids);
node_to_amd_nb(i)->link = link =
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