ad65e8c041
Also sort includes. Change-Id: Ia4a3807e45777e2a596878fe09e3c80b1fd2704d Signed-off-by: Elyes Haouas <ehaouas@noos.fr> Reviewed-on: https://review.coreboot.org/c/coreboot/+/69037 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
123 lines
2.6 KiB
C
123 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <console/console.h>
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#include <cpu/cpu.h>
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#include <cpu/intel/turbo.h>
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#include <cpu/x86/msr.h>
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#if CONFIG(CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED)
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static inline int get_global_turbo_state(void)
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{
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return TURBO_UNKNOWN;
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}
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static inline void set_global_turbo_state(int state)
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{
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}
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#else
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static int g_turbo_state = TURBO_UNKNOWN;
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static inline int get_global_turbo_state(void)
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{
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return g_turbo_state;
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}
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static inline void set_global_turbo_state(int state)
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{
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g_turbo_state = state;
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}
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#endif
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static const char *const turbo_state_desc[] = {
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[TURBO_UNKNOWN] = "unknown",
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[TURBO_UNAVAILABLE] = "unavailable",
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[TURBO_DISABLED] = "available but hidden",
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[TURBO_ENABLED] = "available and visible"
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};
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/*
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* Try to update the global Turbo state.
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*/
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static int update_turbo_state(void)
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{
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struct cpuid_result cpuid_regs;
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int turbo_en, turbo_cap;
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msr_t msr;
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int turbo_state = get_global_turbo_state();
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cpuid_regs = cpuid(CPUID_LEAF_PM);
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turbo_cap = !!(cpuid_regs.eax & PM_CAP_TURBO_MODE);
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msr = rdmsr(IA32_MISC_ENABLE);
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turbo_en = !(msr.hi & H_MISC_DISABLE_TURBO);
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if (!turbo_cap && turbo_en) {
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/* Unavailable */
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turbo_state = TURBO_UNAVAILABLE;
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} else if (!turbo_cap && !turbo_en) {
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/* Available but disabled */
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turbo_state = TURBO_DISABLED;
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} else if (turbo_cap && turbo_en) {
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/* Available */
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turbo_state = TURBO_ENABLED;
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}
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set_global_turbo_state(turbo_state);
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printk(BIOS_INFO, "Turbo is %s\n", turbo_state_desc[turbo_state]);
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return turbo_state;
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}
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/*
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* Determine the current state of Turbo and cache it for later. Turbo is package
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* level config so it does not need to be enabled on every core.
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*/
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int get_turbo_state(void)
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{
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int turbo_state = get_global_turbo_state();
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/* Return cached state if available */
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if (turbo_state == TURBO_UNKNOWN)
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turbo_state = update_turbo_state();
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return turbo_state;
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}
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/*
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* Try to enable Turbo mode.
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*/
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void enable_turbo(void)
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{
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msr_t msr;
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/* Only possible if turbo is available but hidden */
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if (get_turbo_state() == TURBO_DISABLED) {
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/* Clear Turbo Disable bit in Misc Enables */
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msr = rdmsr(IA32_MISC_ENABLE);
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msr.hi &= ~H_MISC_DISABLE_TURBO;
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wrmsr(IA32_MISC_ENABLE, msr);
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/* Update cached turbo state */
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update_turbo_state();
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}
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}
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/*
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* Try to disable Turbo mode.
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*/
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void disable_turbo(void)
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{
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msr_t msr;
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/* Only possible if turbo is available and visible */
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if (get_turbo_state() == TURBO_ENABLED) {
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/* Set Turbo Disable bit in Misc Enables */
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msr = rdmsr(IA32_MISC_ENABLE);
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msr.hi |= H_MISC_DISABLE_TURBO;
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wrmsr(IA32_MISC_ENABLE, msr);
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/* Update cached turbo state */
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update_turbo_state();
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}
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}
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