From 7cc27349cbfec271eecec9488b4bf3f3fadb2ce4 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Fri, 31 Dec 2010 16:57:48 +0100 Subject: x86, microcode, AMD: Simplify get_next_ucode Do not copy the section header but look at it directly through the pointer. Also, make it return a ptr to a ucode header directly thus dropping a bunch of unneeded casts. Finally, simplify generic_load_microcode(), while at it. Signed-off-by: Borislav Petkov Acked-by: Andreas Herrmann --- arch/x86/kernel/microcode_amd.c | 68 +++++++++++++++++++---------------------- 1 file changed, 32 insertions(+), 36 deletions(-) (limited to 'arch/x86/kernel/microcode_amd.c') diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c index 9a451d7182f0..8b58fc13e37e 100644 --- a/arch/x86/kernel/microcode_amd.c +++ b/arch/x86/kernel/microcode_amd.c @@ -88,9 +88,9 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig) return 0; } -static int get_matching_microcode(int cpu, void *mc, int rev) +static int get_matching_microcode(int cpu, struct microcode_header_amd *mc_hdr, + int rev) { - struct microcode_header_amd *mc_header = mc; unsigned int current_cpu_id; u16 equiv_cpu_id = 0; unsigned int i = 0; @@ -109,17 +109,17 @@ static int get_matching_microcode(int cpu, void *mc, int rev) if (!equiv_cpu_id) return 0; - if (mc_header->processor_rev_id != equiv_cpu_id) + if (mc_hdr->processor_rev_id != equiv_cpu_id) return 0; /* ucode might be chipset specific -- currently we don't support this */ - if (mc_header->nb_dev_id || mc_header->sb_dev_id) { + if (mc_hdr->nb_dev_id || mc_hdr->sb_dev_id) { pr_err("CPU%d: loading of chipset specific code not yet supported\n", cpu); return 0; } - if (mc_header->patch_id <= rev) + if (mc_hdr->patch_id <= rev) return 0; return 1; @@ -155,21 +155,18 @@ static int apply_microcode_amd(int cpu) return 0; } -static void * +static struct microcode_header_amd * get_next_ucode(const u8 *buf, unsigned int size, unsigned int *mc_size) { + struct microcode_header_amd *mc; unsigned int total_size; - u8 section_hdr[UCODE_CONTAINER_SECTION_HDR]; - void *mc; - get_ucode_data(section_hdr, buf, UCODE_CONTAINER_SECTION_HDR); - - if (section_hdr[0] != UCODE_UCODE_TYPE) { + if (buf[0] != UCODE_UCODE_TYPE) { pr_err("error: invalid type field in container file section header\n"); return NULL; } - total_size = (unsigned long) (section_hdr[4] + (section_hdr[5] << 8)); + total_size = buf[4] + (buf[5] << 8); if (total_size > size || total_size > UCODE_MAX_SIZE) { pr_err("error: size mismatch\n"); @@ -218,12 +215,12 @@ static enum ucode_state generic_load_microcode(int cpu, const u8 *data, size_t size) { struct ucode_cpu_info *uci = ucode_cpu_info + cpu; + struct microcode_header_amd *mc_hdr = NULL; + unsigned int mc_size, leftover; + unsigned long offset; const u8 *ucode_ptr = data; void *new_mc = NULL; - void *mc; int new_rev = uci->cpu_sig.rev; - unsigned int leftover; - unsigned long offset; enum ucode_state state = UCODE_OK; offset = install_equiv_cpu_table(ucode_ptr); @@ -236,38 +233,37 @@ generic_load_microcode(int cpu, const u8 *data, size_t size) leftover = size - offset; while (leftover) { - unsigned int uninitialized_var(mc_size); - struct microcode_header_amd *mc_header; - - mc = get_next_ucode(ucode_ptr, leftover, &mc_size); - if (!mc) + mc_hdr = get_next_ucode(ucode_ptr, leftover, &mc_size); + if (!mc_hdr) break; - mc_header = (struct microcode_header_amd *)mc; - if (get_matching_microcode(cpu, mc, new_rev)) { + if (get_matching_microcode(cpu, mc_hdr, new_rev)) { vfree(new_mc); - new_rev = mc_header->patch_id; - new_mc = mc; + new_rev = mc_hdr->patch_id; + new_mc = mc_hdr; } else - vfree(mc); + vfree(mc_hdr); ucode_ptr += mc_size; leftover -= mc_size; } - if (new_mc) { - if (!leftover) { - vfree(uci->mc); - uci->mc = new_mc; - pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n", - cpu, new_rev, uci->cpu_sig.rev); - } else { - vfree(new_mc); - state = UCODE_ERROR; - } - } else + if (!new_mc) { state = UCODE_NFOUND; + goto free_table; + } + + if (!leftover) { + vfree(uci->mc); + uci->mc = new_mc; + pr_debug("CPU%d update ucode to version 0x%x (from 0x%x)\n", + cpu, new_rev, uci->cpu_sig.rev); + } else { + vfree(new_mc); + state = UCODE_ERROR; + } +free_table: free_equiv_cpu_table(); return state; -- cgit v1.2.3