linux-kernel - [PATCH V3 2/2] x86/microcode/amd: allow multiple families' bin files appended together

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Message-ID: <1370658140-5299-3-git-send-email-jacob.shin@amd.com>
Date:	Fri, 7 Jun 2013 21:22:20 -0500
From:	Jacob Shin <jacob.shin@....com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Borislav Petkov <bp@...en8.de>,
	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	<x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	Jacob Shin <jacob.shin@....com>
Subject: [PATCH V3 2/2] x86/microcode/amd: allow multiple families' bin files appended together

Add support for parsing through multiple families' microcode patch
container binary files appended together when early loading. This is
already supported on Intel.

Reported-by: Henrique de Moraes Holschuh <hmh@....eng.br>
Signed-off-by: Jacob Shin <jacob.shin@....com>
---
 arch/x86/kernel/microcode_amd_early.c |   68 +++++++++++++++++++++++++++------
 1 file changed, 56 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/microcode_amd_early.c b/arch/x86/kernel/microcode_amd_early.c
index c783248..1ac6e9a 100644
--- a/arch/x86/kernel/microcode_amd_early.c
+++ b/arch/x86/kernel/microcode_amd_early.c
@@ -87,15 +87,21 @@ static void __cpuinit apply_ucode_in_initrd(void *ucode, size_t size)
 	struct equiv_cpu_entry *eq;
 	u32 *header;
 	u8  *data;
-	u16 eq_id;
+	u16 eq_id = 0;
 	int offset, left;
-	u32 rev, dummy;
+	u32 rev, eax;
 	u32 *new_rev;
+	unsigned long *uoffset;
+	size_t *usize;
 
 #ifdef CONFIG_X86_32
 	new_rev = (u32 *)__pa_nodebug(&ucode_new_rev);
+	uoffset = (unsigned long *)__pa_nodebug(&ucode_offset);
+	usize   = (size_t *)__pa_nodebug(&ucode_size);
 #else
 	new_rev = &ucode_new_rev;
+	uoffset = &ucode_offset;
+	usize   = &ucode_size;
 #endif
 
 	data   = ucode;
@@ -108,18 +114,50 @@ static void __cpuinit apply_ucode_in_initrd(void *ucode, size_t size)
 	    header[2] == 0)                            /* size */
 		return;
 
-	eq     = (struct equiv_cpu_entry *)(data + CONTAINER_HDR_SZ);
-	offset = header[2] + CONTAINER_HDR_SZ;
-	data  += offset;
-	left  -= offset;
+	eax = cpuid_eax(0x00000001);
+
+	while (left > 0) {
+		eq = (struct equiv_cpu_entry *)(data + CONTAINER_HDR_SZ);
+
+		offset = header[2] + CONTAINER_HDR_SZ;
+		data  += offset;
+		left  -= offset;
 
-	eq_id  = find_equiv_id(eq, cpuid_eax(0x00000001));
-	if (!eq_id)
+		eq_id = find_equiv_id(eq, eax);
+		if (eq_id)
+			break;
+
+		/*
+		 * support multiple container files appended together. if this
+		 * one does not have a matching equivalent cpu entry, we fast
+		 * forward to the next container file.
+		 */
+		while (left > 0) {
+			header = (u32 *)data;
+			if (header[0] == UCODE_MAGIC &&
+			    header[1] == UCODE_EQUIV_CPU_TABLE_TYPE)
+				break;
+
+			offset = header[1] + SECTION_HDR_SIZE;
+			data  += offset;
+			left  -= offset;
+		}
+
+		/* mark where the next microcode container file starts */
+		offset    = data - (u8 *)ucode;
+		*uoffset += offset;
+		*usize   -= offset;
+		ucode     = data;
+	}
+
+	if (!eq_id) {
+		*usize = 0;
 		return;
+	}
 
 	/* find ucode and update if needed */
 
-	rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
+	rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
 
 	while (left > 0) {
 		struct microcode_amd *mc;
@@ -132,15 +170,21 @@ static void __cpuinit apply_ucode_in_initrd(void *ucode, size_t size)
 		mc = (struct microcode_amd *)(data + SECTION_HDR_SIZE);
 		if (eq_id == mc->hdr.processor_rev_id && rev < mc->hdr.patch_id)
 			if (__apply_microcode_amd(mc) == 0) {
-				if (!(*new_rev))
-					*new_rev = mc->hdr.patch_id;
-				break;
+				rev = mc->hdr.patch_id;
+				*new_rev = rev;
 			}
 
 		offset  = header[1] + SECTION_HDR_SIZE;
 		data   += offset;
 		left   -= offset;
 	}
+
+	/* mark where this microcode container file ends */
+	offset  = *usize - (data - (u8 *)ucode);
+	*usize -= offset;
+
+	if (!(*new_rev))
+		*usize = 0;
 }
 
 void __init load_ucode_amd_bsp(void)
-- 
1.7.9.5


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