linux-kernel - [PATCH v3 3/4] x86/microcode: convert to use sysdata API

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20161216114632.22559-4-mcgrof@kernel.org>
Date:   Fri, 16 Dec 2016 03:46:31 -0800
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     gregkh@...uxfoundation.org, ming.lei@...onical.com
Cc:     wagi@...om.org, teg@...m.no, mchehab@....samsung.com,
        zajec5@...il.com, linux-kernel@...r.kernel.org,
        markivx@...eaurora.org, stephen.boyd@...aro.org,
        broonie@...nel.org, zohar@...ux.vnet.ibm.com, tiwai@...e.de,
        johannes@...solutions.net, chunkeey@...glemail.com,
        hauke@...ke-m.de, jwboyer@...oraproject.org,
        dmitry.torokhov@...il.com, dwmw2@...radead.org, jslaby@...e.com,
        torvalds@...ux-foundation.org, luto@...capital.net,
        fengguang.wu@...el.com, rpurdie@...ys.net,
        j.anaszewski@...sung.com, Abhay_Salunke@...l.com,
        Julia.Lawall@...6.fr, Gilles.Muller@...6.fr, nicolas.palix@...g.fr,
        dhowells@...hat.com, bjorn.andersson@...aro.org,
        arend.vanspriel@...adcom.com, kvalo@...eaurora.org,
        "Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: [PATCH v3 3/4] x86/microcode: convert to use sysdata API

This uses the new flexible firmware API, since we don't
have to keep the firmware around the sysdata API does the
freeing for us safely.

v2: was not present
v5: bike shed changes: sysdata/drvdata

Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
---
 arch/x86/kernel/cpu/microcode/amd.c | 56 +++++++++++++++++++++++++------------
 1 file changed, 38 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 6f353bdb3a25..5d08cd7284e5 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -24,7 +24,7 @@
 #define pr_fmt(fmt) "microcode: " fmt
 
 #include <linux/earlycpio.h>
-#include <linux/firmware.h>
+#include <linux/drvdata.h>
 #include <linux/uaccess.h>
 #include <linux/vmalloc.h>
 #include <linux/initrd.h>
@@ -877,6 +877,31 @@ load_microcode_amd(int cpu, u8 family, const u8 *data, size_t size)
 	return ret;
 }
 
+struct amd_ucode_req {
+	int cpu;
+	struct cpuinfo_x86 *c;
+	enum ucode_state state;
+	const char *name;
+};
+
+static int request_microcode_amd_cb(void *context,
+				    const struct drvdata *drvdata)
+{
+	struct amd_ucode_req *req = context;
+
+	if (*(u32 *)drvdata->data != UCODE_MAGIC) {
+		pr_err("invalid magic value (0x%08x)\n",
+		       *(u32 *)drvdata->data);
+		req->state = UCODE_ERROR;
+		return -EINVAL;
+	}
+
+	req->state = load_microcode_amd(req->cpu, req->c->x86,
+					drvdata->data, drvdata->size);
+
+	return 0;
+}
+
 /*
  * AMD microcode firmware naming convention, up to family 15h they are in
  * the legacy file:
@@ -896,10 +921,13 @@ load_microcode_amd(int cpu, u8 family, const u8 *data, size_t size)
 static enum ucode_state request_microcode_amd(int cpu, struct device *device,
 					      bool refresh_fw)
 {
+	struct amd_ucode_req req;
 	char fw_name[36] = "amd-ucode/microcode_amd.bin";
 	struct cpuinfo_x86 *c = &cpu_data(cpu);
-	enum ucode_state ret = UCODE_NFOUND;
-	const struct firmware *fw;
+	const struct drvdata_req_params req_params = {
+			DRVDATA_DEFAULT_SYNC(request_microcode_amd_cb, &req),
+			.optional = true,
+	};
 
 	/* reload ucode container only on the boot cpu */
 	if (!refresh_fw || c->cpu_index != boot_cpu_data.cpu_index)
@@ -908,24 +936,16 @@ static enum ucode_state request_microcode_amd(int cpu, struct device *device,
 	if (c->x86 >= 0x15)
 		snprintf(fw_name, sizeof(fw_name), "amd-ucode/microcode_amd_fam%.2xh.bin", c->x86);
 
-	if (request_firmware_direct(&fw, (const char *)fw_name, device)) {
-		pr_debug("failed to load file %s\n", fw_name);
-		goto out;
-	}
+	req.cpu = cpu;
+	req.c = c;
+	req.name = fw_name;
+	req.state = UCODE_NFOUND;
 
-	ret = UCODE_ERROR;
-	if (*(u32 *)fw->data != UCODE_MAGIC) {
-		pr_err("invalid magic value (0x%08x)\n", *(u32 *)fw->data);
-		goto fw_release;
+	if (drvdata_request((const char *)fw_name, &req_params, device)) {
+		pr_debug("failed to load file %s\n", fw_name);
 	}
 
-	ret = load_microcode_amd(cpu, c->x86, fw->data, fw->size);
-
- fw_release:
-	release_firmware(fw);
-
- out:
-	return ret;
+	return req.state;
 }
 
 static enum ucode_state
-- 
2.10.1