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99 lines
2.7 KiB
99 lines
2.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_RESCTRL_H |
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#define _ASM_X86_RESCTRL_H |
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#ifdef CONFIG_X86_CPU_RESCTRL |
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#include <linux/sched.h> |
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#include <linux/jump_label.h> |
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#define IA32_PQR_ASSOC 0x0c8f |
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/** |
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* struct resctrl_pqr_state - State cache for the PQR MSR |
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* @cur_rmid: The cached Resource Monitoring ID |
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* @cur_closid: The cached Class Of Service ID |
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* @default_rmid: The user assigned Resource Monitoring ID |
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* @default_closid: The user assigned cached Class Of Service ID |
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* |
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* The upper 32 bits of IA32_PQR_ASSOC contain closid and the |
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* lower 10 bits rmid. The update to IA32_PQR_ASSOC always |
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* contains both parts, so we need to cache them. This also |
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* stores the user configured per cpu CLOSID and RMID. |
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* |
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* The cache also helps to avoid pointless updates if the value does |
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* not change. |
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*/ |
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struct resctrl_pqr_state { |
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u32 cur_rmid; |
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u32 cur_closid; |
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u32 default_rmid; |
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u32 default_closid; |
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}; |
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DECLARE_PER_CPU(struct resctrl_pqr_state, pqr_state); |
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DECLARE_STATIC_KEY_FALSE(rdt_enable_key); |
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DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key); |
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DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key); |
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/* |
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* __resctrl_sched_in() - Writes the task's CLOSid/RMID to IA32_PQR_MSR |
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* |
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* Following considerations are made so that this has minimal impact |
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* on scheduler hot path: |
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* - This will stay as no-op unless we are running on an Intel SKU |
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* which supports resource control or monitoring and we enable by |
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* mounting the resctrl file system. |
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* - Caches the per cpu CLOSid/RMID values and does the MSR write only |
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* when a task with a different CLOSid/RMID is scheduled in. |
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* - We allocate RMIDs/CLOSids globally in order to keep this as |
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* simple as possible. |
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* Must be called with preemption disabled. |
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*/ |
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static void __resctrl_sched_in(void) |
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{ |
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struct resctrl_pqr_state *state = this_cpu_ptr(&pqr_state); |
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u32 closid = state->default_closid; |
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u32 rmid = state->default_rmid; |
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u32 tmp; |
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/* |
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* If this task has a closid/rmid assigned, use it. |
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* Else use the closid/rmid assigned to this cpu. |
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*/ |
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if (static_branch_likely(&rdt_alloc_enable_key)) { |
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tmp = READ_ONCE(current->closid); |
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if (tmp) |
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closid = tmp; |
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} |
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if (static_branch_likely(&rdt_mon_enable_key)) { |
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tmp = READ_ONCE(current->rmid); |
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if (tmp) |
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rmid = tmp; |
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} |
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if (closid != state->cur_closid || rmid != state->cur_rmid) { |
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state->cur_closid = closid; |
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state->cur_rmid = rmid; |
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wrmsr(IA32_PQR_ASSOC, rmid, closid); |
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} |
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} |
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static inline void resctrl_sched_in(void) |
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{ |
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if (static_branch_likely(&rdt_enable_key)) |
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__resctrl_sched_in(); |
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} |
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void resctrl_cpu_detect(struct cpuinfo_x86 *c); |
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#else |
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static inline void resctrl_sched_in(void) {} |
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static inline void resctrl_cpu_detect(struct cpuinfo_x86 *c) {} |
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#endif /* CONFIG_X86_CPU_RESCTRL */ |
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#endif /* _ASM_X86_RESCTRL_H */
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