linux-kernel - [PATCH v2 13/31] EDAC/amd64: Define function to check DRAM limit address

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Message-Id: <20210623192002.3671647-14-yazen.ghannam@amd.com>
Date:   Wed, 23 Jun 2021 19:19:44 +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 13/31] EDAC/amd64: Define function to check DRAM limit address

Move the DRAM limit check into a separate helper function.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
Link:
https://lkml.kernel.org/r/20210507190140.18854-10-Yazen.Ghannam@amd.com

v1->v2:
* Moved from arch/x86 to EDAC.

 drivers/edac/amd64_edac.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 46b0279a2e12..de80a224ef12 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1359,10 +1359,20 @@ static int add_base_and_hole(struct addr_ctx *ctx)
 	return 0;
 }
 
-static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
+static int addr_over_limit(struct addr_ctx *ctx)
 {
-	u64 dram_limit_addr;
+	u64 dram_limit_addr  = ((ctx->reg_limit_addr & GENMASK_ULL(31, 12)) << 16)
+					| GENMASK_ULL(27, 0);
+
+	/* Is calculated system address above DRAM limit address? */
+	if (ctx->ret_addr > dram_limit_addr)
+		return -EINVAL;
 
+	return 0;
+}
+
+static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
+{
 	struct addr_ctx ctx;
 
 	memset(&ctx, 0, sizeof(ctx));
@@ -1388,16 +1398,13 @@ static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr
 	if (denormalize_addr(&ctx))
 		goto out_err;
 
-	dram_limit_addr	  = ((ctx.reg_limit_addr & GENMASK_ULL(31, 12)) << 16) | GENMASK_ULL(27, 0);
-
 	if (add_base_and_hole(&ctx))
 		goto out_err;
 
 	if (ctx.dehash_addr && ctx.dehash_addr(&ctx))
 		goto out_err;
 
-	/* Is calculated system address is above DRAM limit address? */
-	if (ctx.ret_addr > dram_limit_addr)
+	if (addr_over_limit(&ctx))
 		goto out_err;
 
 	*sys_addr = ctx.ret_addr;
-- 
2.25.1