projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 644e9cbb | 2 | #include <asm/cpu_device_id.h> |
| cd4d09ec | 3 | #include <asm/cpufeature.h> |
| 644e9cbb | 4 | #include <linux/cpu.h> |
| 186f4360 | 5 | #include <linux/export.h> |
| fad12ac8 | 6 | #include <linux/slab.h> |
| 644e9cbb AK |
7 | |
| 8 | /** | |
| 9 | * x86_match_cpu - match current CPU again an array of x86_cpu_ids | |
| 10 | * @match: Pointer to array of x86_cpu_ids. Last entry terminated with | |
| 11 | * {}. | |
| 12 | * | |
| 13 | * Return the entry if the current CPU matches the entries in the | |
| 14 | * passed x86_cpu_id match table. Otherwise NULL. The match table | |
| 15 | * contains vendor (X86_VENDOR_*), family, model and feature bits or | |
| 16 | * respective wildcard entries. | |
| 17 | * | |
| 18 | * A typical table entry would be to match a specific CPU | |
| 20d43744 | 19 | * |
| f055b626 | 20 | * X86_MATCH_VFM_FEATURE(INTEL_BROADWELL, X86_FEATURE_ANY, NULL); |
| 644e9cbb AK |
21 | * |
| 22 | * Fields can be wildcarded with %X86_VENDOR_ANY, %X86_FAMILY_ANY, | |
| 20d43744 TG |
23 | * %X86_MODEL_ANY, %X86_FEATURE_ANY (except for vendor) |
| 24 | * | |
| 25 | * asm/cpu_device_id.h contains a set of useful macros which are shortcuts | |
| 26 | * for various common selections. The above can be shortened to: | |
| 27 | * | |
| c73cd372 | 28 | * X86_MATCH_VFM(INTEL_BROADWELL, NULL); |
| 644e9cbb AK |
29 | * |
| 30 | * Arrays used to match for this should also be declared using | |
| a7e0e4e9 | 31 | * MODULE_DEVICE_TABLE(x86cpu, ...) |
| 644e9cbb AK |
32 | * |
| 33 | * This always matches against the boot cpu, assuming models and features are | |
| 34 | * consistent over all CPUs. | |
| 35 | */ | |
| 36 | const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match) | |
| 37 | { | |
| 38 | const struct x86_cpu_id *m; | |
| 39 | struct cpuinfo_x86 *c = &boot_cpu_data; | |
| 40 | ||
| 93022482 | 41 | for (m = match; m->flags & X86_CPU_ID_FLAG_ENTRY_VALID; m++) { |
| 644e9cbb AK |
42 | if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor) |
| 43 | continue; | |
| 44 | if (m->family != X86_FAMILY_ANY && c->x86 != m->family) | |
| 45 | continue; | |
| 46 | if (m->model != X86_MODEL_ANY && c->x86_model != m->model) | |
| 47 | continue; | |
| e9d71445 MG |
48 | if (m->steppings != X86_STEPPING_ANY && |
| 49 | !(BIT(c->x86_stepping) & m->steppings)) | |
| 50 | continue; | |
| 644e9cbb AK |
51 | if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature)) |
| 52 | continue; | |
| 53 | return m; | |
| 54 | } | |
| 55 | return NULL; | |
| 56 | } | |
| 57 | EXPORT_SYMBOL(x86_match_cpu); | |
| 0f42b790 KL |
58 | |
| 59 | static const struct x86_cpu_desc * | |
| 60 | x86_match_cpu_with_stepping(const struct x86_cpu_desc *match) | |
| 61 | { | |
| 62 | struct cpuinfo_x86 *c = &boot_cpu_data; | |
| 63 | const struct x86_cpu_desc *m; | |
| 64 | ||
| 65 | for (m = match; m->x86_family | m->x86_model; m++) { | |
| 66 | if (c->x86_vendor != m->x86_vendor) | |
| 67 | continue; | |
| 68 | if (c->x86 != m->x86_family) | |
| 69 | continue; | |
| 70 | if (c->x86_model != m->x86_model) | |
| 71 | continue; | |
| 72 | if (c->x86_stepping != m->x86_stepping) | |
| 73 | continue; | |
| 74 | return m; | |
| 75 | } | |
| 76 | return NULL; | |
| 77 | } | |
| 78 | ||
| 79 | bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table) | |
| 80 | { | |
| 81 | const struct x86_cpu_desc *res = x86_match_cpu_with_stepping(table); | |
| 82 | ||
| 83 | if (!res || res->x86_microcode_rev > boot_cpu_data.microcode) | |
| 84 | return false; | |
| 85 | ||
| 86 | return true; | |
| 87 | } | |
| 88 | EXPORT_SYMBOL_GPL(x86_cpu_has_min_microcode_rev); |