diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/aperture_64.c | 89 | ||||
| -rw-r--r-- | arch/x86/kernel/e820_64.c | 12 | ||||
| -rw-r--r-- | arch/x86/kernel/setup_64.c | 3 | ||||
| -rw-r--r-- | include/asm-x86/e820_64.h | 1 | ||||
| -rw-r--r-- | include/asm-x86/gart.h | 5 |
6 files changed, 114 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 40db7dd1d92a..860a90875491 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -660,6 +660,10 @@ and is between 256 and 4096 characters. It is defined in the file gamma= [HW,DRM] + gart_fix_e820= [X86_64] disable the fix e820 for K8 GART + Format: off | on + default: on + gdth= [HW,SCSI] See header of drivers/scsi/gdth.c. diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c index 52d2beac4556..bf1b469d5847 100644 --- a/arch/x86/kernel/aperture_64.c +++ b/arch/x86/kernel/aperture_64.c @@ -218,6 +218,95 @@ static __u32 __init search_agp_bridge(u32 *order, int *valid_agp) return 0; } +static int gart_fix_e820 __initdata = 1; + +static int __init parse_gart_mem(char *p) +{ + if (!p) + return -EINVAL; + + if (!strncmp(p, "off", 3)) + gart_fix_e820 = 0; + else if (!strncmp(p, "on", 2)) + gart_fix_e820 = 1; + + return 0; +} +early_param("gart_fix_e820", parse_gart_mem); + +void __init early_gart_iommu_check(void) +{ + /* + * in case it is enabled before, esp for kexec/kdump, + * previous kernel already enable that. memset called + * by allocate_aperture/__alloc_bootmem_nopanic cause restart. + * or second kernel have different position for GART hole. and new + * kernel could use hole as RAM that is still used by GART set by + * first kernel + * or BIOS forget to put that in reserved. + * try to update e820 to make that region as reserved. + */ + int fix, num; + u32 ctl; + u32 aper_size = 0, aper_order = 0, last_aper_order = 0; + u64 aper_base = 0, last_aper_base = 0; + int aper_enabled = 0, last_aper_enabled = 0; + + if (!early_pci_allowed()) + return; + + fix = 0; + for (num = 24; num < 32; num++) { + if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00))) + continue; + + ctl = read_pci_config(0, num, 3, 0x90); + aper_enabled = ctl & 1; + aper_order = (ctl >> 1) & 7; + aper_size = (32 * 1024 * 1024) << aper_order; + aper_base = read_pci_config(0, num, 3, 0x94) & 0x7fff; + aper_base <<= 25; + + if ((last_aper_order && aper_order != last_aper_order) || + (last_aper_base && aper_base != last_aper_base) || + (last_aper_enabled && aper_enabled != last_aper_enabled)) { + fix = 1; + break; + } + last_aper_order = aper_order; + last_aper_base = aper_base; + last_aper_enabled = aper_enabled; + } + + if (!fix && !aper_enabled) + return; + + if (!aper_base || !aper_size || aper_base + aper_size > 0x100000000UL) + fix = 1; + + if (gart_fix_e820 && !fix && aper_enabled) { + if (e820_any_mapped(aper_base, aper_base + aper_size, + E820_RAM)) { + /* reserved it, so we can resuse it in second kernel */ + printk(KERN_INFO "update e820 for GART\n"); + add_memory_region(aper_base, aper_size, E820_RESERVED); + update_e820(); + } + return; + } + + /* different nodes have different setting, disable them all at first*/ + for (num = 24; num < 32; num++) { + if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00))) + continue; + + ctl = read_pci_config(0, num, 3, 0x90); + ctl &= ~1; + write_pci_config(0, num, 3, 0x90, ctl); + } + +} + void __init gart_iommu_hole_init(void) { u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0; diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c index abc473bcabe8..07cfaae7ab07 100644 --- a/arch/x86/kernel/e820_64.c +++ b/arch/x86/kernel/e820_64.c @@ -728,6 +728,18 @@ void __init finish_e820_parsing(void) } } +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"); + e820_print_map("modified"); +} + unsigned long pci_mem_start = 0xaeedbabe; EXPORT_SYMBOL(pci_mem_start); diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c index 07547febac7a..12bad27d66f8 100644 --- a/arch/x86/kernel/setup_64.c +++ b/arch/x86/kernel/setup_64.c @@ -53,6 +53,7 @@ #include <video/edid.h> #include <asm/e820.h> #include <asm/dma.h> +#include <asm/gart.h> #include <asm/mpspec.h> #include <asm/mmu_context.h> #include <asm/proto.h> @@ -335,6 +336,8 @@ void __init setup_arch(char **cmdline_p) finish_e820_parsing(); + early_gart_iommu_check(); + e820_register_active_regions(0, 0, -1UL); /* * partially used pages are not usable - thus diff --git a/include/asm-x86/e820_64.h b/include/asm-x86/e820_64.h index 8cba49da4795..ff36f434f00b 100644 --- a/include/asm-x86/e820_64.h +++ b/include/asm-x86/e820_64.h @@ -39,6 +39,7 @@ extern void e820_register_active_regions(int nid, extern void finish_e820_parsing(void); extern struct e820map e820; +extern void update_e820(void); extern unsigned ebda_addr, ebda_size; extern unsigned long nodemap_addr, nodemap_size; diff --git a/include/asm-x86/gart.h b/include/asm-x86/gart.h index f704c50519b8..90958ed993fa 100644 --- a/include/asm-x86/gart.h +++ b/include/asm-x86/gart.h @@ -9,6 +9,7 @@ extern int iommu_detected; extern void gart_iommu_init(void); extern void gart_iommu_shutdown(void); extern void __init gart_parse_options(char *); +extern void early_gart_iommu_check(void); extern void gart_iommu_hole_init(void); extern int fallback_aper_order; extern int fallback_aper_force; @@ -20,6 +21,10 @@ extern int fix_aperture; #define gart_iommu_aperture 0 #define gart_iommu_aperture_allowed 0 +static inline void early_gart_iommu_check(void) +{ +} + static inline void gart_iommu_shutdown(void) { } |