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CPUs can generate traffic with a range of PARTID and PMG values, but each MSC may also have its own maximum size for these fields. Before MPAM can be used, the driver needs to probe each RIS on each MSC, to find the system-wide smallest value that can be used. The limits from requestors (e.g. CPUs) also need taking into account. While doing this, RIS entries that firmware didn't describe are created under MPAM_CLASS_UNKNOWN. This adds the low level MSC write accessors. While we're here, implement the mpam_register_requestor() call for the arch code to register the CPU limits. Future callers of this will tell us about the SMMU and ITS. Signed-off-by: James Morse <james.morse@arm.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Reviewed-by: Ben Horgan <ben.horgan@arm.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com> Reviewed-by: Fenghua Yu <fenghuay@nvidia.com> Tested-by: Fenghua Yu <fenghuay@nvidia.com> Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com> Tested-by: Peter Newman <peternewman@google.com> Tested-by: Carl Worth <carl@os.amperecomputing.com> Tested-by: Gavin Shan <gshan@redhat.com> Tested-by: Zeng Heng <zengheng4@huawei.com> Tested-by: Hanjun Guo <guohanjun@huawei.com> Signed-off-by: Ben Horgan <ben.horgan@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
67 lines
1.8 KiB
C
67 lines
1.8 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/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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/**
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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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