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// SPDX-License-Identifier: GPL-2.0
#include <asm/cpu_device_id.h>
#include <asm/cpufeature.h>
#include <linux/cpu.h>
#include <linux/export.h>
#include <linux/slab.h>
/**
* x86_match_vendor_cpu_type - helper function to match the hardware defined
* cpu-type for a single entry in the x86_cpu_id
* table. Note, this function does not match the
* generic cpu-types TOPO_CPU_TYPE_EFFICIENCY and
* TOPO_CPU_TYPE_PERFORMANCE.
* @c: Pointer to the cpuinfo_x86 structure of the CPU to match.
* @m: Pointer to the x86_cpu_id entry to match against.
*
* Return: true if the cpu-type matches, false otherwise.
*/
static bool x86_match_vendor_cpu_type(struct cpuinfo_x86 *c, const struct x86_cpu_id *m)
{
if (m->type == X86_CPU_TYPE_ANY)
return true;
/* Hybrid CPUs are special, they are assumed to match all cpu-types */
if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU))
return true;
if (c->x86_vendor == X86_VENDOR_INTEL)
return m->type == c->topo.intel_type;
if (c->x86_vendor == X86_VENDOR_AMD)
return m->type == c->topo.amd_type;
return false;
}
/**
* x86_match_cpu - match current CPU against an array of x86_cpu_ids
* @match: Pointer to array of x86_cpu_ids. Last entry terminated with
* {}.
*
* Return the entry if the current CPU matches the entries in the
* passed x86_cpu_id match table. Otherwise NULL. The match table
* contains vendor (X86_VENDOR_*), family, model and feature bits or
* respective wildcard entries.
*
* A typical table entry would be to match a specific CPU
*
* X86_MATCH_VFM_FEATURE(INTEL_BROADWELL, X86_FEATURE_ANY, NULL);
*
* Fields can be wildcarded with %X86_VENDOR_ANY, %X86_FAMILY_ANY,
* %X86_MODEL_ANY, %X86_FEATURE_ANY (except for vendor)
*
* asm/cpu_device_id.h contains a set of useful macros which are shortcuts
* for various common selections. The above can be shortened to:
*
* X86_MATCH_VFM(INTEL_BROADWELL, NULL);
*
* Arrays used to match for this should also be declared using
* MODULE_DEVICE_TABLE(x86cpu, ...)
*
* This always matches against the boot cpu, assuming models and features are
* consistent over all CPUs.
*/
const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match)
{
const struct x86_cpu_id *m;
struct cpuinfo_x86 *c = &boot_cpu_data;
for (m = match; m->flags & X86_CPU_ID_FLAG_ENTRY_VALID; m++) {
if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor)
continue;
if (m->family != X86_FAMILY_ANY && c->x86 != m->family)
continue;
if (m->model != X86_MODEL_ANY && c->x86_model != m->model)
continue;
if (m->steppings != X86_STEPPING_ANY &&
!(BIT(c->x86_stepping) & m->steppings))
continue;
if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature))
continue;
if (!x86_match_vendor_cpu_type(c, m))
continue;
return m;
}
return NULL;
}
EXPORT_SYMBOL(x86_match_cpu);
bool x86_match_min_microcode_rev(const struct x86_cpu_id *table)
{
const struct x86_cpu_id *res = x86_match_cpu(table);
if (!res || res->driver_data > boot_cpu_data.microcode)
return false;
return true;
}
EXPORT_SYMBOL_GPL(x86_match_min_microcode_rev);
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