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Fri, 7 May 2021 19:02:00 +0000 From: Yazen Ghannam To: linux-edac@vger.kernel.org Cc: Yazen Ghannam , linux-kernel@vger.kernel.org, tony.luck@intel.com, x86@kernel.org, Smita.KoralahalliChannabasappa@amd.com Subject: [PATCH 08/25] x86/MCE/AMD: Define function to dehash address Date: Fri, 7 May 2021 15:01:23 -0400 Message-Id: <20210507190140.18854-9-Yazen.Ghannam@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210507190140.18854-1-Yazen.Ghannam@amd.com> References: <20210507190140.18854-1-Yazen.Ghannam@amd.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [165.204.25.250] X-ClientProxiedBy: BN6PR21CA0010.namprd21.prod.outlook.com (2603:10b6:404:8e::20) To BN8PR12MB3108.namprd12.prod.outlook.com (2603:10b6:408:40::20) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from aus-x-yghannam.amd.com (165.204.25.250) by BN6PR21CA0010.namprd21.prod.outlook.com (2603:10b6:404:8e::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4129.3 via Frontend Transport; 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Define a DF2-specific function for the current code. Specific helper functions will be added for future DF versions. Signed-off-by: Yazen Ghannam --- arch/x86/kernel/cpu/mce/amd.c | 41 ++++++++++++++++++++++------------- 1 file changed, 26 insertions(+), 15 deletions(-) diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c index d1a6405bb990..e341737e03d4 100644 --- a/arch/x86/kernel/cpu/mce/amd.c +++ b/arch/x86/kernel/cpu/mce/amd.c @@ -961,12 +961,34 @@ static int add_base_and_hole(struct addr_ctx *ctx) return 0; } +static int dehash_addr_df2(struct addr_ctx *ctx) +{ + u8 hashed_bit = (ctx->ret_addr >> 12) ^ + (ctx->ret_addr >> 18) ^ + (ctx->ret_addr >> 21) ^ + (ctx->ret_addr >> 30) ^ + ctx->cs_id; + + hashed_bit &= BIT(0); + + if (hashed_bit != ((ctx->ret_addr >> ctx->intlv_addr_bit) & BIT(0))) + ctx->ret_addr ^= BIT(ctx->intlv_addr_bit); + + return 0; +} + +static int dehash_addr(struct addr_ctx *ctx) +{ + if (!ctx->hash_enabled) + return 0; + + return dehash_addr_df2(ctx); +} + int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr) { u64 dram_limit_addr; - u8 hashed_bit; - struct addr_ctx ctx; memset(&ctx, 0, sizeof(ctx)); @@ -996,19 +1018,8 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr) if (add_base_and_hole(&ctx)) goto out_err; - if (ctx.hash_enabled) { - /* Save some parentheses and grab ls-bit at the end. */ - hashed_bit = (ctx.ret_addr >> 12) ^ - (ctx.ret_addr >> 18) ^ - (ctx.ret_addr >> 21) ^ - (ctx.ret_addr >> 30) ^ - ctx.cs_id; - - hashed_bit &= BIT(0); - - if (hashed_bit != ((ctx.ret_addr >> ctx.intlv_addr_bit) & BIT(0))) - ctx.ret_addr ^= BIT(ctx.intlv_addr_bit); - } + if (dehash_addr(&ctx)) + goto out_err; /* Is calculated system address is above DRAM limit address? */ if (ctx.ret_addr > dram_limit_addr) -- 2.25.1