linux-kernel - [PATCH v2 04/31] EDAC/amd64: Allow for DF Indirect Broadcast reads

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Message-Id: <20210623192002.3671647-5-yazen.ghannam@amd.com>
Date:   Wed, 23 Jun 2021 19:19:35 +0000
From:   Yazen Ghannam <yazen.ghannam@....com>
To:     linux-edac@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, bp@...en8.de, mchehab@...nel.org,
        tony.luck@...el.com, Smita.KoralahalliChannabasappa@....com,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH v2 04/31] EDAC/amd64: Allow for DF Indirect Broadcast reads

The DF Indirect Access method allows for "Broadcast" accesses in which
case no specific instance is targeted. Add support using a reserved
instance ID of 0xFF to indicate a broadcast access. Set the FICAA
register appropriately.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
Link:
https://lkml.kernel.org/r/20210507190140.18854-1-Yazen.Ghannam@amd.com

v1->v2:
* New in v2.

 drivers/edac/amd64_edac.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index b94067e3952b..d67cd8f57b94 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1010,7 +1010,11 @@ struct df_reg {
  *
  * Fabric Indirect Configuration Access Data (FICAD): There are FICAD LO
  * and FICAD HI registers but so far we only need the LO register.
+ *
+ * Use Instance Id 0xFF to indicate a broadcast read.
  */
+
+#define DF_BROADCAST	0xFF
 static int amd_df_indirect_read(u16 node, struct df_reg reg, u8 instance_id, u32 *lo)
 {
 	struct pci_dev *F4;
@@ -1024,7 +1028,7 @@ static int amd_df_indirect_read(u16 node, struct df_reg reg, u8 instance_id, u32
 	if (!F4)
 		goto out;
 
-	ficaa  = 1;
+	ficaa  = (instance_id == DF_BROADCAST) ? 0 : 1;
 	ficaa |= reg.offset & 0x3FC;
 	ficaa |= (reg.func & 0x7) << 11;
 	ficaa |= instance_id << 16;
-- 
2.25.1