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  *   ˆl–Ü4ý( ©³( 	Å€fàD¦-ÿÀƒmöƒ_†I|¥+ÄÃ 5    /* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_RESCTRL_H
#define _ASM_X86_RESCTRL_H

#ifdef CONFIG_X86_CPU_RESCTRL

#include <linux/jump_label.h>
#include <linux/percpu.h>
#include <linux/resctrl_types.h>
#include <linux/sched.h>

/*
 * This value can never be a valid CLOSID, and is used when mapping a
 * (closid, rmid) pair to an index and back. On x86 only the RMID is
 * needed. The index is a software defined value.
 */
#define X86_RESCTRL_EMPTY_CLOSID         ((u32)~0)

/**
 * struct resctrl_pqr_state - State cache for the PQR MSR
 * @cur_rmid:		The cached Resource Monitoring ID
 * @cur_closid:	The cached Class Of Service ID
 * @default_rmid:	The user assigned Resource Monitoring ID
 * @default_closid:	The user assigned cached Class Of Service ID
 *
 * The upper 32 bits of MSR_IA32_PQR_ASSOC contain closid and the
 * lower 10 bits rmid. The update to MSR_IA32_PQR_ASSOC always
 * contains both parts, so we need to cache them. This also
 * stores the user configured per cpu CLOSID and RMID.
 *
 * The cache also helps to avoid pointless updates if the value does
 * not change.
 */
struct resctrl_pqr_state {
	u32			cur_rmid;
	u32			cur_closid;
	u32			default_rmid;
	u32			default_closid;
};

DECLARE_PER_CPU(struct resctrl_pqr_state, pqr_state);

extern bool rdt_alloc_capable;
extern bool rdt_mon_capable;
extern unsigned int rdt_mon_features;

DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);

static inline bool resctrl_arch_alloc_capable(void)
{
	return rdt_alloc_capable;
}

static inline void resctrl_arch_enable_alloc(void)
{
	static_branch_enable_cpuslocked(&rdt_alloc_enable_key);
	static_branch_inc_cpuslocked(&rdt_enable_key);
}

static inline void resctrl_arch_disable_alloc(void)
{
	static_branch_disable_cpuslocked(&rdt_alloc_enable_key);
	static_branch_dec_cpuslocked(&rdt_enable_key);
}

static inline bool resctrl_arch_mon_capable(void)
{
	return rdt_mon_capable;
}

static inline void resctrl_arch_enable_mon(void)
{
	static_branch_enable_cpuslocked(&rdt_mon_enable_key);
	static_branch_inc_cpuslocked(&rdt_enable_key);
}

static inline void resctrl_arch_disable_mon(void)
{
	static_branch_disable_cpuslocked(&rdt_mon_enable_key);
	static_branch_dec_cpuslocked(&rdt_enable_key);
}

static inline bool resctrl_arch_is_llc_occupancy_enabled(void)
{
	return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
}

static inline bool resctrl_arch_is_mbm_total_enabled(void)
{
	return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
}

static inline bool resctrl_arch_is_mbm_local_enabled(void)
{
	return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
}

/*
 * __resctrl_sched_in() - Writes the task's CLOSid/RMID to IA32_PQR_MSR
 *
 * Following considerations are made so that this has minimal impact
 * on scheduler hot path:
 * - This will stay as no-op unless we are running on an Intel SKU
 *   which supports resource control or monitoring and we enable by
 *   mounting the resctrl file system.
 * - Caches the per cpu CLOSid/RMID values and does the MSR write only
 *   when a task with a different CLOSid/RMID is scheduled in.
 * - We allocate RMIDs/CLOSids globally in order to keep this as
 *   simple as possible.
 * Must be called with preemption disabled.
 */
static inline void __resctrl_sched_in(struct task_struct *tsk)
{
	struct resctrl_pqr_state *state = this_cpu_ptr(&pqr_state);
	u32 closid = READ_ONCE(state->default_closid);
	u32 rmid = READ_ONCE(state->default_rmid);
	u32 tmp;

	/*
	 * If this task has a closid/rmid assigned, use it.
	 * Else use the closid/rmid assigned to this cpu.
	 */
	if (static_branch_likely(&rdt_alloc_enable_key)) {
		tmp = READ_ONCE(tsk->closid);
		if (tmp)
			closid = tmp;
	}

	if (static_branch_likely(&rdt_mon_enable_key)) {
		tmp = READ_ONCE(tsk->rmid);
		if (tmp)
			rmid = tmp;
	}

	if (closid != state->cur_closid || rmid != state->cur_rmid) {
		state->cur_closid = closid;