From b591ee3913b7eeef851451641c85e1e014d2103f Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Mon, 15 Dec 2014 22:02:41 -0700 Subject: x86: Correct problems in the microcode loading There are several problems in the code. The device tree decode is incorrect in ways that are masked due to a matching bug. Both are fixed. Also microcode_read_rev() should be inline and called before the microcode is written. Note: microcode writing does not work correctly on ivybridge for me. Further work is needed to resolve this. But this patch tidies up the existing code so that will be easier. Signed-off-by: Simon Glass --- arch/x86/cpu/ivybridge/microcode_intel.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) (limited to 'arch') diff --git a/arch/x86/cpu/ivybridge/microcode_intel.c b/arch/x86/cpu/ivybridge/microcode_intel.c index 79c075fbf2..08177510ab 100644 --- a/arch/x86/cpu/ivybridge/microcode_intel.c +++ b/arch/x86/cpu/ivybridge/microcode_intel.c @@ -50,17 +50,17 @@ static int microcode_decode_node(const void *blob, int node, update->date_code = fdtdec_get_int(blob, node, "intel,date-code", 0); update->processor_signature = fdtdec_get_int(blob, node, - "intel.processor-signature", 0); + "intel,processor-signature", 0); update->checksum = fdtdec_get_int(blob, node, "intel,checksum", 0); update->loader_revision = fdtdec_get_int(blob, node, - "loader-revision", 0); + "intel,loader-revision", 0); update->processor_flags = fdtdec_get_int(blob, node, - "processor-flags", 0); + "intel,processor-flags", 0); return 0; } -static uint32_t microcode_read_rev(void) +static inline uint32_t microcode_read_rev(void) { /* * Some Intel CPUs can be very finicky about the CPUID sequence used. @@ -116,6 +116,7 @@ int microcode_update_intel(void) { struct microcode_update cpu, update; const void *blob = gd->fdt_blob; + int skipped; int count; int node; int ret; @@ -123,12 +124,13 @@ int microcode_update_intel(void) microcode_read_cpu(&cpu); node = 0; count = 0; + skipped = 0; do { node = fdtdec_next_compatible(blob, node, COMPAT_INTEL_MICROCODE); if (node < 0) { debug("%s: Found %d updates\n", __func__, count); - return count ? 0 : -ENOENT; + return count ? 0 : skipped ? -EEXIST : -ENOENT; } ret = microcode_decode_node(blob, node, &update); @@ -137,12 +139,15 @@ int microcode_update_intel(void) ret); return ret; } - if (update.processor_signature == cpu.processor_signature && - (update.processor_flags & cpu.processor_flags)) { - debug("%s: Update already exists\n", __func__); - return -EEXIST; + if (!(update.processor_signature == cpu.processor_signature && + (update.processor_flags & cpu.processor_flags))) { + debug("%s: Skipping non-matching update, sig=%x, pf=%x\n", + __func__, update.processor_signature, + update.processor_flags); + skipped++; + continue; } - + ret = microcode_read_rev(); wrmsr(0x79, (ulong)update.data, 0); debug("microcode: updated to revision 0x%x date=%04x-%02x-%02x\n", microcode_read_rev(), update.date_code & 0xffff, -- cgit v1.2.1