linux-kernel - [PATCH v2 7/8] x86/microcode: convert to use sysdata API

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Date:	Thu, 16 Jun 2016 16:59:18 -0700
From:	"Luis R. Rodriguez" <mcgrof@...nel.org>
To:	ming.lei@...onical.com, akpm@...ux-foundation.org, mmarek@...e.com,
	gregkh@...uxfoundation.org, bp@...en8.de, chunkeey@...glemail.com
Cc:	linux-kernel@...r.kernel.org, markivx@...eaurora.org,
	stephen.boyd@...aro.org, zohar@...ux.vnet.ibm.com,
	broonie@...nel.org, tiwai@...e.de, johannes@...solutions.net,
	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, ki@...sung.com,
	Abhay_Salunke@...l.com, Julia.Lawall@...6.fr,
	Gilles.Muller@...6.fr, nicolas.palix@...g.fr, teg@...m.no,
	dhowells@...hat.com, keescook@...omium.org, tj@...nel.org,
	daniel.vetter@...ll.ch, corbet@....net,
	"Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: [PATCH v2 7/8] 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.

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 27a0228c9cae..df4351ce4256 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -23,7 +23,7 @@
 #define pr_fmt(fmt) "microcode: " fmt
 
 #include <linux/earlycpio.h>
-#include <linux/firmware.h>
+#include <linux/sysdata.h>
 #include <linux/uaccess.h>
 #include <linux/vmalloc.h>
 #include <linux/initrd.h>
@@ -872,6 +872,31 @@ enum ucode_state load_microcode_amd(int cpu, u8 family, const u8 *data, size_t s
 	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 sysdata_file *sysdata)
+{
+	struct amd_ucode_req *req = context;
+
+	if (*(u32 *)sysdata->data != UCODE_MAGIC) {
+		pr_err("invalid magic value (0x%08x)\n",
+		       *(u32 *)sysdata->data);
+		req->state = UCODE_ERROR;
+		return -EINVAL;
+	}
+
+	req->state = load_microcode_amd(req->cpu, req->c->x86,
+					sysdata->data, sysdata->size);
+
+	return 0;
+}
+
 /*
  * AMD microcode firmware naming convention, up to family 15h they are in
  * the legacy file:
@@ -891,10 +916,13 @@ enum ucode_state load_microcode_amd(int cpu, u8 family, const u8 *data, size_t s
 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 sysdata_file_desc sysdata_desc = {
+			SYSDATA_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)
@@ -903,24 +931,16 @@ 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 (sysdata_file_request((const char *)fw_name, &sysdata_desc, 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
-- 
2.8.2