[PATCH v3 02/33] x86/amd_nb, EDAC/amd64: Move DF Indirect Read to AMD64 EDAC

[Yazen Ghannam <yazen.ghannam@amd.com>]

The df_indirect_read() function is only used for address translation.
Move this to EDAC along with the translation code.

Cc: <x86@kernel.org>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
Link:       
https://lkml.kernel.org/r/20210623192002.3671647-3-yazen.ghannam@amd.com
            
v2->v3:     
* No change.
                                                                                                                                 
v1->v2:     
* New in v2.

 arch/x86/include/asm/amd_nb.h |  1 -
 arch/x86/kernel/amd_nb.c      | 49 +---------------------------------
 drivers/edac/amd64_edac.c     | 50 +++++++++++++++++++++++++++++++++++
 3 files changed, 51 insertions(+), 49 deletions(-)

diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h
index a78d088dae40..2ccac1efe1e9 100644
--- a/arch/x86/include/asm/amd_nb.h
+++ b/arch/x86/include/asm/amd_nb.h
@@ -24,7 +24,6 @@ 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;
diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
index 0b495406ab9c..17f4e6e25613 100644
--- a/arch/x86/kernel/amd_nb.c
+++ b/arch/x86/kernel/amd_nb.c
@@ -31,7 +31,7 @@
 #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F4 0x166e
 #define PCI_DEVICE_ID_AMD_ALDEBARAN_DF_F4 0x14d4
 
-/* Protect the PCI config register pairs used for SMN and DF indirect access. */
+/* Protect the PCI config register pairs used for SMN. */
 static DEFINE_MUTEX(smn_mutex);
 
 static u32 *flush_words;
@@ -247,53 +247,6 @@ int amd_smn_write(u16 node, u32 address, u32 value)
 }
 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);
 
 struct pci_dev *get_root_devs(struct pci_dev *root,
 			      const struct pci_device_id *root_ids,
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 9b87aa38803d..28c96fd06019 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -986,6 +986,56 @@ static int sys_addr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr)
 	return csrow;
 }
 
+/* Protect the PCI config register pairs used for DF indirect access. */
+static DEFINE_MUTEX(df_indirect_mutex);
+
+/*
+ * 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.
+ */
+static 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_nb_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(&df_indirect_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(&df_indirect_mutex);
+
+out:
+	return err;
+}
+
 static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 {
 	u64 dram_base_addr, dram_limit_addr, dram_hole_base;
-- 
2.25.1