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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-05-20 14:35:06 +02:00
James Morse
efc775eadc
A few resctrl features and hooks need to be provided, but aren't needed or supported on MPAM platforms. resctrl has individual hooks to separately enable and disable the closid/partid and rmid/pmg context switching code. For MPAM this is all the same thing, as the value in struct task_struct is used to cache the value that should be written to hardware. arm64's context switching code is enabled once MPAM is usable, but doesn't touch the hardware unless the value has changed. For now event configuration is not supported, and can be turned off by returning 'false' from resctrl_arch_is_evt_configurable(). The new io_alloc feature is not supported either, always return false from the enable helper to indicate and fail the enable. Add this, and empty definitions for the other hooks. Tested-by: Gavin Shan <gshan@redhat.com> Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com> Tested-by: Peter Newman <peternewman@google.com> Tested-by: Zeng Heng <zengheng4@huawei.com> Tested-by: Punit Agrawal <punit.agrawal@oss.qualcomm.com> Tested-by: Jesse Chick <jessechick@os.amperecomputing.com> Reviewed-by: Zeng Heng <zengheng4@huawei.com> Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Co-developed-by: Ben Horgan <ben.horgan@arm.com> Signed-off-by: Ben Horgan <ben.horgan@arm.com> Signed-off-by: James Morse <james.morse@arm.com>
99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2025 Arm Ltd. */
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#ifndef __LINUX_ARM_MPAM_H
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#define __LINUX_ARM_MPAM_H
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#include <linux/acpi.h>
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#include <linux/resctrl_types.h>
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#include <linux/types.h>
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struct mpam_msc;
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enum mpam_msc_iface {
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MPAM_IFACE_MMIO, /* a real MPAM MSC */
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MPAM_IFACE_PCC, /* a fake MPAM MSC */
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};
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enum mpam_class_types {
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MPAM_CLASS_CACHE, /* Caches, e.g. L2, L3 */
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MPAM_CLASS_MEMORY, /* Main memory */
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MPAM_CLASS_UNKNOWN, /* Everything else, e.g. SMMU */
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};
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#define MPAM_CLASS_ID_DEFAULT 255
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#ifdef CONFIG_ACPI_MPAM
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int acpi_mpam_parse_resources(struct mpam_msc *msc,
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struct acpi_mpam_msc_node *tbl_msc);
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int acpi_mpam_count_msc(void);
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#else
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static inline int acpi_mpam_parse_resources(struct mpam_msc *msc,
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struct acpi_mpam_msc_node *tbl_msc)
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{
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return -EINVAL;
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}
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static inline int acpi_mpam_count_msc(void) { return -EINVAL; }
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#endif
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#ifdef CONFIG_ARM64_MPAM_DRIVER
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int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
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enum mpam_class_types type, u8 class_id, int component_id);
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#else
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static inline int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
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enum mpam_class_types type, u8 class_id,
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int component_id)
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{
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return -EINVAL;
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}
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#endif
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bool resctrl_arch_alloc_capable(void);
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bool resctrl_arch_mon_capable(void);
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void resctrl_arch_set_cpu_default_closid(int cpu, u32 closid);
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void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
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void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 rmid);
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void resctrl_arch_sched_in(struct task_struct *tsk);
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bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid);
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bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
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u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid);
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void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid);
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u32 resctrl_arch_system_num_rmid_idx(void);
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struct rdt_resource;
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void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r, enum resctrl_event_id evtid);
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void resctrl_arch_mon_ctx_free(struct rdt_resource *r, enum resctrl_event_id evtid, void *ctx);
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/*
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* The CPU configuration for MPAM is cheap to write, and is only written if it
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* has changed. No need for fine grained enables.
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*/
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static inline void resctrl_arch_enable_mon(void) { }
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static inline void resctrl_arch_disable_mon(void) { }
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static inline void resctrl_arch_enable_alloc(void) { }
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static inline void resctrl_arch_disable_alloc(void) { }
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static inline unsigned int resctrl_arch_round_mon_val(unsigned int val)
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{
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return val;
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}
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/**
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* mpam_register_requestor() - Register a requestor with the MPAM driver
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* @partid_max: The maximum PARTID value the requestor can generate.
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* @pmg_max: The maximum PMG value the requestor can generate.
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*
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* Registers a requestor with the MPAM driver to ensure the chosen system-wide
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* minimum PARTID and PMG values will allow the requestors features to be used.
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*
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* Returns an error if the registration is too late, and a larger PARTID/PMG
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* value has been advertised to user-space. In this case the requestor should
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* not use its MPAM features. Returns 0 on success.
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*/
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int mpam_register_requestor(u16 partid_max, u8 pmg_max);
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#endif /* __LINUX_ARM_MPAM_H */
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