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Wed, 23 Jun 2021 19:20:42 +0000 From: Yazen Ghannam To: linux-edac@vger.kernel.org Cc: linux-kernel@vger.kernel.org, bp@alien8.de, mchehab@kernel.org, tony.luck@intel.com, Smita.KoralahalliChannabasappa@amd.com, Yazen Ghannam Subject: [PATCH v2 04/31] EDAC/amd64: Allow for DF Indirect Broadcast reads Date: Wed, 23 Jun 2021 19:19:35 +0000 Message-Id: <20210623192002.3671647-5-yazen.ghannam@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210623192002.3671647-1-yazen.ghannam@amd.com> References: <20210623192002.3671647-1-yazen.ghannam@amd.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [165.204.184.1] X-ClientProxiedBy: BLAPR03CA0107.namprd03.prod.outlook.com (2603:10b6:208:32a::22) To BN8PR12MB3108.namprd12.prod.outlook.com (2603:10b6:408:40::20) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from yaz-ethanolx.amd.com (165.204.184.1) by BLAPR03CA0107.namprd03.prod.outlook.com (2603:10b6:208:32a::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4242.19 via Frontend Transport; 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Add support using a reserved instance ID of 0xFF to indicate a broadcast access. Set the FICAA register appropriately. Signed-off-by: Yazen Ghannam --- 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