| Venkatesh Pallipadi | 02df8b9 | 2005-04-15 15:07:10 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * arch/i386/kernel/acpi/cstate.c |
| 3 | * |
| 4 | * Copyright (C) 2005 Intel Corporation |
| 5 | * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> |
| 6 | * - Added _PDC for SMP C-states on Intel CPUs |
| 7 | */ |
| 8 | |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/acpi.h> |
| 13 | |
| 14 | #include <acpi/processor.h> |
| 15 | #include <asm/acpi.h> |
| 16 | |
| 17 | static void acpi_processor_power_init_intel_pdc(struct acpi_processor_power |
| 18 | *pow) |
| 19 | { |
| 20 | struct acpi_object_list *obj_list; |
| 21 | union acpi_object *obj; |
| 22 | u32 *buf; |
| 23 | |
| 24 | /* allocate and initialize pdc. It will be used later. */ |
| 25 | obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); |
| 26 | if (!obj_list) { |
| 27 | printk(KERN_ERR "Memory allocation error\n"); |
| 28 | return; |
| 29 | } |
| 30 | |
| 31 | obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); |
| 32 | if (!obj) { |
| 33 | printk(KERN_ERR "Memory allocation error\n"); |
| 34 | kfree(obj_list); |
| 35 | return; |
| 36 | } |
| 37 | |
| 38 | buf = kmalloc(12, GFP_KERNEL); |
| 39 | if (!buf) { |
| 40 | printk(KERN_ERR "Memory allocation error\n"); |
| 41 | kfree(obj); |
| 42 | kfree(obj_list); |
| 43 | return; |
| 44 | } |
| 45 | |
| 46 | buf[0] = ACPI_PDC_REVISION_ID; |
| 47 | buf[1] = 1; |
| 48 | buf[2] = ACPI_PDC_C_CAPABILITY_SMP; |
| 49 | |
| 50 | obj->type = ACPI_TYPE_BUFFER; |
| 51 | obj->buffer.length = 12; |
| 52 | obj->buffer.pointer = (u8 *) buf; |
| 53 | obj_list->count = 1; |
| 54 | obj_list->pointer = obj; |
| 55 | pow->pdc = obj_list; |
| 56 | |
| 57 | return; |
| 58 | } |
| 59 | |
| 60 | /* Initialize _PDC data based on the CPU vendor */ |
| 61 | void acpi_processor_power_init_pdc(struct acpi_processor_power *pow, |
| 62 | unsigned int cpu) |
| 63 | { |
| 64 | struct cpuinfo_x86 *c = cpu_data + cpu; |
| 65 | |
| 66 | pow->pdc = NULL; |
| 67 | if (c->x86_vendor == X86_VENDOR_INTEL) |
| 68 | acpi_processor_power_init_intel_pdc(pow); |
| 69 | |
| 70 | return; |
| 71 | } |
| 72 | |
| 73 | EXPORT_SYMBOL(acpi_processor_power_init_pdc); |
| 74 | |
| 75 | /* |
| 76 | * Initialize bm_flags based on the CPU cache properties |
| 77 | * On SMP it depends on cache configuration |
| 78 | * - When cache is not shared among all CPUs, we flush cache |
| 79 | * before entering C3. |
| 80 | * - When cache is shared among all CPUs, we use bm_check |
| 81 | * mechanism as in UP case |
| 82 | * |
| 83 | * This routine is called only after all the CPUs are online |
| 84 | */ |
| 85 | void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags, |
| 86 | unsigned int cpu) |
| 87 | { |
| 88 | struct cpuinfo_x86 *c = cpu_data + cpu; |
| 89 | |
| 90 | flags->bm_check = 0; |
| 91 | if (num_online_cpus() == 1) |
| 92 | flags->bm_check = 1; |
| 93 | else if (c->x86_vendor == X86_VENDOR_INTEL) { |
| 94 | /* |
| 95 | * Today all CPUs that support C3 share cache. |
| 96 | * TBD: This needs to look at cache shared map, once |
| 97 | * multi-core detection patch makes to the base. |
| 98 | */ |
| 99 | flags->bm_check = 1; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | EXPORT_SYMBOL(acpi_processor_power_init_bm_check); |