--- /dev/null
+/*
+ * Copyright (C) 2013 Advanced Micro Devices, Inc.
+ *
+ * Author: Jacob Shin <jacob.shin@amd.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/earlycpio.h>
+
+#include <asm/cpu.h>
+#include <asm/setup.h>
+#include <asm/microcode_amd.h>
+
+static bool ucode_loaded;
+static u32 ucode_new_rev;
+
+/*
+ * Microcode patch container file is prepended to the initrd in cpio format.
+ * See Documentation/x86/early-microcode.txt
+ */
+static __initdata char ucode_path[] = "kernel/x86/microcode/AuthenticAMD.bin";
+
+static struct cpio_data __init find_ucode_in_initrd(void)
+{
+ long offset = 0;
+ struct cpio_data cd;
+
+#ifdef CONFIG_X86_32
+ /*
+ * On 32-bit, early load occurs before paging is turned on so we need
+ * to use physical addresses.
+ */
+ if (!(read_cr0() & X86_CR0_PG)) {
+ struct boot_params *p;
+ p = (struct boot_params *)__pa_nodebug(&boot_params);
+ cd = find_cpio_data((char *)__pa_nodebug(ucode_path),
+ (void *)p->hdr.ramdisk_image, p->hdr.ramdisk_size,
+ &offset);
+ } else
+#endif
+ cd = find_cpio_data(ucode_path,
+ (void *)(boot_params.hdr.ramdisk_image + PAGE_OFFSET),
+ boot_params.hdr.ramdisk_size, &offset);
+
+ if (*(u32 *)cd.data != UCODE_MAGIC) {
+ cd.data = NULL;
+ cd.size = 0;
+ }
+
+ return cd;
+}
+
+/*
+ * Early load occurs before we can vmalloc(). So we look for the microcode
+ * patch container file in initrd, traverse equivalent cpu table, look for a
+ * matching microcode patch, and update, all in initrd memory in place.
+ * When vmalloc() is available for use later -- on 64-bit during first AP load,
+ * and on 32-bit during save_microcode_in_initrd_amd() -- we can call
+ * load_microcode_amd() to save equivalent cpu table and microcode patches in
+ * kernel heap memory.
+ */
+static void __init apply_ucode_in_initrd(void)
+{
+ struct cpio_data cd;
+ struct equiv_cpu_entry *eq;
+ u32 *header;
+ u8 *data;
+ u16 eq_id;
+ int offset, left;
+ u32 rev, dummy;
+ u32 *new_rev;
+
+#ifdef CONFIG_X86_32
+ new_rev = (u32 *)__pa_nodebug(&ucode_new_rev);
+#else
+ new_rev = &ucode_new_rev;
+#endif
+ cd = find_ucode_in_initrd();
+ if (!cd.data)
+ return;
+
+ data = cd.data;
+ left = cd.size;
+ header = (u32 *)data;
+
+ /* find equiv cpu table */
+
+ if (header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */
+ header[2] == 0) /* size */
+ return;
+
+ 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)
+ return;
+
+ /* find ucode and update if needed */
+
+ rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
+
+ while (left > 0) {
+ struct microcode_amd *mc;
+
+ header = (u32 *)data;
+ if (header[0] != UCODE_UCODE_TYPE || /* type */
+ header[1] == 0) /* size */
+ break;
+
+ 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;
+ }
+
+ offset = header[1] + SECTION_HDR_SIZE;
+ data += offset;
+ left -= offset;
+ }
+}
+
+void __init load_ucode_amd_bsp(void)
+{
+ apply_ucode_in_initrd();
+}
+
+#ifdef CONFIG_X86_32
+u8 __cpuinitdata amd_bsp_mpb[MPB_MAX_SIZE];
+
+/*
+ * On 32-bit, since AP's early load occurs before paging is turned on, we
+ * cannot traverse cpu_equiv_table and pcache in kernel heap memory. So during
+ * cold boot, AP will apply_ucode_in_initrd() just like the BSP. During
+ * save_microcode_in_initrd_amd() BSP's patch is copied to amd_bsp_mpb, which
+ * is used upon resume from suspend.
+ */
+void __cpuinit load_ucode_amd_ap(void)
+{
+ struct microcode_amd *mc;
+
+ mc = (struct microcode_amd *)__pa_nodebug(amd_bsp_mpb);
+ if (mc->hdr.patch_id && mc->hdr.processor_rev_id)
+ __apply_microcode_amd(mc);
+ else
+ apply_ucode_in_initrd();
+}
+
+static void __init collect_cpu_sig_on_bsp(void *arg)
+{
+ unsigned int cpu = smp_processor_id();
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+ uci->cpu_sig.sig = cpuid_eax(0x00000001);
+}
+#else
+static void __cpuinit collect_cpu_info_amd_early(struct cpuinfo_x86 *c,
+ struct ucode_cpu_info *uci)
+{
+ u32 rev, eax;
+
+ rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
+ eax = cpuid_eax(0x00000001);
+
+ uci->cpu_sig.sig = eax;
+ uci->cpu_sig.rev = rev;
+ c->microcode = rev;
+ c->x86 = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
+}
+
+void __cpuinit load_ucode_amd_ap(void)
+{
+ unsigned int cpu = smp_processor_id();
+
+ collect_cpu_info_amd_early(&cpu_data(cpu), ucode_cpu_info + cpu);
+
+ if (cpu && !ucode_loaded) {
+ struct cpio_data cd = find_ucode_in_initrd();
+ if (load_microcode_amd(0, cd.data, cd.size) != UCODE_OK)
+ return;
+ ucode_loaded = true;
+ }
+
+ apply_microcode_amd(cpu);
+}
+#endif
+
+int __init save_microcode_in_initrd_amd(void)
+{
+ enum ucode_state ret;
+ struct cpio_data cd;
+#ifdef CONFIG_X86_32
+ unsigned int bsp = boot_cpu_data.cpu_index;
+ struct ucode_cpu_info *uci = ucode_cpu_info + bsp;
+
+ if (!uci->cpu_sig.sig)
+ smp_call_function_single(bsp, collect_cpu_sig_on_bsp, NULL, 1);
+#endif
+ if (ucode_new_rev)
+ pr_info("microcode: updated early to new patch_level=0x%08x\n",
+ ucode_new_rev);
+
+ if (ucode_loaded)
+ return 0;
+
+ cd = find_ucode_in_initrd();
+ if (!cd.data)
+ return -EINVAL;
+
+ ret = load_microcode_amd(0, cd.data, cd.size);
+ if (ret != UCODE_OK)
+ return -EINVAL;
+
+ ucode_loaded = true;
+ return 0;
+}
projects / firefly-linux-kernel-4.4.55.git / commitdiff