| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* Copyright (C) 2025 Arm Ltd. */ |
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| 3 | |
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| 4 | #ifndef __LINUX_ARM_MPAM_H |
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| 5 | #define __LINUX_ARM_MPAM_H |
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| 6 | |
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| 7 | #include <linux/acpi.h> |
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| 8 | #include <linux/types.h> |
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| 9 | |
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| 10 | struct mpam_msc; |
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| 11 | |
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| 12 | enum mpam_msc_iface { |
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| 13 | MPAM_IFACE_MMIO, /* a real MPAM MSC */ |
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| 14 | MPAM_IFACE_PCC, /* a fake MPAM MSC */ |
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| 15 | }; |
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| 16 | |
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| 17 | enum mpam_class_types { |
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| 18 | MPAM_CLASS_CACHE, /* Caches, e.g. L2, L3 */ |
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| 19 | MPAM_CLASS_MEMORY, /* Main memory */ |
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| 20 | MPAM_CLASS_UNKNOWN, /* Everything else, e.g. SMMU */ |
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| 21 | }; |
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| 22 | |
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| 23 | #define MPAM_CLASS_ID_DEFAULT 255 |
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| 24 | |
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| 25 | #ifdef CONFIG_ACPI_MPAM |
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| 26 | int acpi_mpam_parse_resources(struct mpam_msc *msc, |
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| 27 | struct acpi_mpam_msc_node *tbl_msc); |
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| 28 | |
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| 29 | int acpi_mpam_count_msc(void); |
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| 30 | #else |
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| 31 | static inline int acpi_mpam_parse_resources(struct mpam_msc *msc, |
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| 32 | struct acpi_mpam_msc_node *tbl_msc) |
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| 33 | { |
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| 34 | return -EINVAL; |
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| 35 | } |
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| 36 | |
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| 37 | static inline int acpi_mpam_count_msc(void) { return -EINVAL; } |
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| 38 | #endif |
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| 39 | |
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| 40 | #ifdef CONFIG_ARM64_MPAM_DRIVER |
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| 41 | int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx, |
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| 42 | enum mpam_class_types type, u8 class_id, int component_id); |
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| 43 | #else |
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| 44 | static inline int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx, |
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| 45 | enum mpam_class_types type, u8 class_id, |
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| 46 | int component_id) |
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| 47 | { |
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| 48 | return -EINVAL; |
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| 49 | } |
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| 50 | #endif |
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| 51 | |
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| 52 | /** |
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| 53 | * mpam_register_requestor() - Register a requestor with the MPAM driver |
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| 54 | * @partid_max: The maximum PARTID value the requestor can generate. |
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| 55 | * @pmg_max: The maximum PMG value the requestor can generate. |
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| 56 | * |
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| 57 | * Registers a requestor with the MPAM driver to ensure the chosen system-wide |
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| 58 | * minimum PARTID and PMG values will allow the requestors features to be used. |
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| 59 | * |
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| 60 | * Returns an error if the registration is too late, and a larger PARTID/PMG |
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| 61 | * value has been advertised to user-space. In this case the requestor should |
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| 62 | * not use its MPAM features. Returns 0 on success. |
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| 63 | */ |
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| 64 | int mpam_register_requestor(u16 partid_max, u8 pmg_max); |
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| 65 | |
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| 66 | #endif /* __LINUX_ARM_MPAM_H */ |
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| 67 | |
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