linux-kernel - [PATCH v3 12/33] EDAC/amd64: Define function to check DRAM limit address

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Message-ID: <20211028175728.121452-13-yazen.ghannam@amd.com>
Date:   Thu, 28 Oct 2021 17:57:07 +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>, <james.morse@....com>,
        <rric@...nel.org>, <Smita.KoralahalliChannabasappa@....com>,
        <NaveenKrishna.Chatradhi@....com>, <Muralidhara.MK@....com>,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH v3 12/33] 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/20210623192002.3671647-14-yazen.ghannam@amd.com

v2->v3:
* Was patch 13 in v2.

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 d7a2f621fdc0..b0bf9dd0ba34 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1316,10 +1316,20 @@ 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;
 
 	if (!df_ops)
@@ -1345,16 +1355,13 @@ 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