diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 30 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/mtrr/main.c | 22 | ||||
| -rw-r--r-- | arch/x86/kernel/e820_32.c | 11 | ||||
| -rw-r--r-- | arch/x86/kernel/setup_32.c | 6 | ||||
| -rw-r--r-- | include/asm-x86/e820_32.h | 3 |
6 files changed, 64 insertions, 10 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 50d564dabb1..fe3031d5643 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -583,7 +583,7 @@ and is between 256 and 4096 characters. It is defined in the file See drivers/char/README.epca and Documentation/digiepca.txt. - disable_mtrr_trim [X86-64, Intel only] + disable_mtrr_trim [X86, Intel and AMD only] By default the kernel will trim any uncacheable memory out of your available memory pool based on MTRR settings. This parameter disables that behavior, diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 56cc341cc58..bba850b05d0 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -278,6 +278,33 @@ void __init cpu_detect(struct cpuinfo_x86 *c) c->x86_cache_alignment = ((misc >> 8) & 0xff) * 8; } } +static void __cpuinit early_get_cap(struct cpuinfo_x86 *c) +{ + u32 tfms, xlvl; + int ebx; + + memset(&c->x86_capability, 0, sizeof c->x86_capability); + if (have_cpuid_p()) { + /* Intel-defined flags: level 0x00000001 */ + if (c->cpuid_level >= 0x00000001) { + u32 capability, excap; + cpuid(0x00000001, &tfms, &ebx, &excap, &capability); + c->x86_capability[0] = capability; + c->x86_capability[4] = excap; + } + + /* AMD-defined flags: level 0x80000001 */ + xlvl = cpuid_eax(0x80000000); + if ((xlvl & 0xffff0000) == 0x80000000) { + if (xlvl >= 0x80000001) { + c->x86_capability[1] = cpuid_edx(0x80000001); + c->x86_capability[6] = cpuid_ecx(0x80000001); + } + } + + } + +} /* Do minimum CPU detection early. Fields really needed: vendor, cpuid_level, family, model, mask, cache alignment. @@ -306,6 +333,8 @@ static void __init early_cpu_detect(void) early_init_intel(c); break; } + + early_get_cap(c); } static void __cpuinit generic_identify(struct cpuinfo_x86 * c) @@ -485,7 +514,6 @@ void __init identify_boot_cpu(void) identify_cpu(&boot_cpu_data); sysenter_setup(); enable_sep_cpu(); - mtrr_bp_init(); } void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c) diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c index ccd36ed2187..ac4b6338f3f 100644 --- a/arch/x86/kernel/cpu/mtrr/main.c +++ b/arch/x86/kernel/cpu/mtrr/main.c @@ -624,7 +624,6 @@ static struct sysdev_driver mtrr_sysdev_driver = { .resume = mtrr_restore, }; -#ifdef CONFIG_X86_64 static int disable_mtrr_trim; static int __init disable_mtrr_trim_setup(char *str) @@ -643,13 +642,10 @@ early_param("disable_mtrr_trim", disable_mtrr_trim_setup); #define Tom2Enabled (1U << 21) #define Tom2ForceMemTypeWB (1U << 22) -static __init int amd_special_default_mtrr(unsigned long end_pfn) +static __init int amd_special_default_mtrr(void) { u32 l, h; - /* Doesn't apply to memory < 4GB */ - if (end_pfn <= (0xffffffff >> PAGE_SHIFT)) - return 0; if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) return 0; if (boot_cpu_data.x86 < 0xf || boot_cpu_data.x86 > 0x11) @@ -687,9 +683,14 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn) * Make sure we only trim uncachable memory on machines that * support the Intel MTRR architecture: */ + if (!is_cpu(INTEL) || disable_mtrr_trim) + return 0; rdmsr(MTRRdefType_MSR, def, dummy); def &= 0xff; - if (!is_cpu(INTEL) || disable_mtrr_trim || def != MTRR_TYPE_UNCACHABLE) + if (def != MTRR_TYPE_UNCACHABLE) + return 0; + + if (amd_special_default_mtrr()) return 0; /* Find highest cached pfn */ @@ -703,8 +704,14 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn) highest_addr = base + size; } - if (amd_special_default_mtrr(end_pfn)) + /* kvm/qemu doesn't have mtrr set right, don't trim them all */ + if (!highest_addr) { + printk(KERN_WARNING "***************\n"); + printk(KERN_WARNING "**** WARNING: likely strange cpu\n"); + printk(KERN_WARNING "**** MTRRs all blank, cpu in qemu?\n"); + printk(KERN_WARNING "***************\n"); return 0; + } if ((highest_addr >> PAGE_SHIFT) < end_pfn) { printk(KERN_WARNING "***************\n"); @@ -726,7 +733,6 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn) return 0; } -#endif /** * mtrr_bp_init - initialize mtrrs on the boot CPU diff --git a/arch/x86/kernel/e820_32.c b/arch/x86/kernel/e820_32.c index 931934a7b35..4e16ef4a265 100644 --- a/arch/x86/kernel/e820_32.c +++ b/arch/x86/kernel/e820_32.c @@ -749,3 +749,14 @@ static int __init parse_memmap(char *arg) return 0; } early_param("memmap", parse_memmap); +void __init update_e820(void) +{ + u8 nr_map; + + nr_map = e820.nr_map; + if (sanitize_e820_map(e820.map, &nr_map)) + return; + e820.nr_map = nr_map; + printk(KERN_INFO "modified physical RAM map:\n"); + print_memory_map("modified"); +} diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c index 26a56f714d3..83ba3ca5f43 100644 --- a/arch/x86/kernel/setup_32.c +++ b/arch/x86/kernel/setup_32.c @@ -48,6 +48,7 @@ #include <video/edid.h> +#include <asm/mtrr.h> #include <asm/apic.h> #include <asm/e820.h> #include <asm/mpspec.h> @@ -758,6 +759,11 @@ void __init setup_arch(char **cmdline_p) max_low_pfn = setup_memory(); + /* update e820 for memory not covered by WB MTRRs */ + mtrr_bp_init(); + if (mtrr_trim_uncached_memory(max_pfn)) + max_low_pfn = setup_memory(); + #ifdef CONFIG_VMI /* * Must be after max_low_pfn is determined, and before kernel diff --git a/include/asm-x86/e820_32.h b/include/asm-x86/e820_32.h index e2faf5f3a0b..f1da7ebd190 100644 --- a/include/asm-x86/e820_32.h +++ b/include/asm-x86/e820_32.h @@ -19,12 +19,15 @@ #ifndef __ASSEMBLY__ extern struct e820map e820; +extern void update_e820(void); extern int e820_all_mapped(unsigned long start, unsigned long end, unsigned type); extern int e820_any_mapped(u64 start, u64 end, unsigned type); extern void find_max_pfn(void); extern void register_bootmem_low_pages(unsigned long max_low_pfn); +extern void add_memory_region(unsigned long long start, + unsigned long long size, int type); extern void e820_register_memory(void); extern void limit_regions(unsigned long long size); extern void print_memory_map(char *who); |