diff options
Diffstat (limited to 'arch/x86_64/kernel')
-rw-r--r-- | arch/x86_64/kernel/pci-calgary.c | 11 | ||||
-rw-r--r-- | arch/x86_64/kernel/time.c | 25 |
2 files changed, 29 insertions, 7 deletions
diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c index 87d90cb68a7..3d65b1d4c2b 100644 --- a/arch/x86_64/kernel/pci-calgary.c +++ b/arch/x86_64/kernel/pci-calgary.c @@ -1068,6 +1068,8 @@ void __init detect_calgary(void) if (!early_pci_allowed()) return; + printk(KERN_DEBUG "Calgary: detecting Calgary via BIOS EBDA area\n"); + ptr = (unsigned long)phys_to_virt(get_bios_ebda()); rio_table_hdr = NULL; @@ -1088,14 +1090,14 @@ void __init detect_calgary(void) offset = *((unsigned short *)(ptr + offset)); } if (!rio_table_hdr) { - printk(KERN_ERR "Calgary: Unable to locate " - "Rio Grande Table in EBDA - bailing!\n"); + printk(KERN_DEBUG "Calgary: Unable to locate Rio Grande table " + "in EBDA - bailing!\n"); return; } ret = build_detail_arrays(); if (ret) { - printk(KERN_ERR "Calgary: build_detail_arrays ret %d\n", ret); + printk(KERN_DEBUG "Calgary: build_detail_arrays ret %d\n", ret); return; } @@ -1128,6 +1130,9 @@ void __init detect_calgary(void) } } + printk(KERN_DEBUG "Calgary: finished detection, Calgary %s\n", + calgary_found ? "found" : "not found"); + if (calgary_found) { iommu_detected = 1; calgary_detected = 1; diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c index 9f05bc9b2da..5cc76d0d331 100644 --- a/arch/x86_64/kernel/time.c +++ b/arch/x86_64/kernel/time.c @@ -656,6 +656,25 @@ core_initcall(cpufreq_tsc); */ #define TICK_COUNT 100000000 +#define TICK_MIN 5000 + +/* + * Some platforms take periodic SMI interrupts with 5ms duration. Make sure none + * occurs between the reads of the hpet & TSC. + */ +static void __init read_hpet_tsc(int *hpet, int *tsc) +{ + int tsc1, tsc2, hpet1; + + do { + tsc1 = get_cycles_sync(); + hpet1 = hpet_readl(HPET_COUNTER); + tsc2 = get_cycles_sync(); + } while (tsc2 - tsc1 > TICK_MIN); + *hpet = hpet1; + *tsc = tsc2; +} + static unsigned int __init hpet_calibrate_tsc(void) { @@ -666,13 +685,11 @@ static unsigned int __init hpet_calibrate_tsc(void) local_irq_save(flags); local_irq_disable(); - hpet_start = hpet_readl(HPET_COUNTER); - rdtscl(tsc_start); + read_hpet_tsc(&hpet_start, &tsc_start); do { local_irq_disable(); - hpet_now = hpet_readl(HPET_COUNTER); - tsc_now = get_cycles_sync(); + read_hpet_tsc(&hpet_now, &tsc_now); local_irq_restore(flags); } while ((tsc_now - tsc_start) < TICK_COUNT && (hpet_now - hpet_start) < TICK_COUNT); |