| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * Copyright (C) 2023-2024 Linaro Ltd. |
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| 4 | */ |
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| 5 | |
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| 6 | #ifndef __QCOM_TZMEM_H |
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| 7 | #define __QCOM_TZMEM_H |
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| 8 | |
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| 9 | #include <linux/cleanup.h> |
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| 10 | #include <linux/gfp.h> |
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| 11 | #include <linux/types.h> |
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| 12 | |
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| 13 | struct device; |
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| 14 | struct qcom_tzmem_pool; |
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| 15 | |
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| 16 | /** |
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| 17 | * enum qcom_tzmem_policy - Policy for pool growth. |
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| 18 | */ |
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| 19 | enum qcom_tzmem_policy { |
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| 20 | /** |
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| 21 | * @QCOM_TZMEM_POLICY_STATIC: Static pool, |
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| 22 | * never grow above initial size. |
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| 23 | */ |
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| 24 | QCOM_TZMEM_POLICY_STATIC = 1, |
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| 25 | /** |
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| 26 | * @QCOM_TZMEM_POLICY_MULTIPLIER: When out of memory, |
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| 27 | * add increment * current size of memory. |
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| 28 | */ |
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| 29 | QCOM_TZMEM_POLICY_MULTIPLIER, |
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| 30 | /** |
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| 31 | * @QCOM_TZMEM_POLICY_ON_DEMAND: When out of memory |
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| 32 | * add as much as is needed until max_size. |
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| 33 | */ |
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| 34 | QCOM_TZMEM_POLICY_ON_DEMAND, |
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| 35 | }; |
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| 36 | |
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| 37 | /** |
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| 38 | * struct qcom_tzmem_pool_config - TZ memory pool configuration. |
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| 39 | * @initial_size: Number of bytes to allocate for the pool during its creation. |
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| 40 | * @policy: Pool size growth policy. |
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| 41 | * @increment: Used with policies that allow pool growth. |
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| 42 | * @max_size: Size above which the pool will never grow. |
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| 43 | */ |
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| 44 | struct qcom_tzmem_pool_config { |
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| 45 | size_t initial_size; |
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| 46 | enum qcom_tzmem_policy policy; |
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| 47 | size_t increment; |
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| 48 | size_t max_size; |
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| 49 | }; |
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| 50 | |
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| 51 | struct qcom_tzmem_pool * |
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| 52 | qcom_tzmem_pool_new(const struct qcom_tzmem_pool_config *config); |
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| 53 | void qcom_tzmem_pool_free(struct qcom_tzmem_pool *pool); |
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| 54 | struct qcom_tzmem_pool * |
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| 55 | devm_qcom_tzmem_pool_new(struct device *dev, |
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| 56 | const struct qcom_tzmem_pool_config *config); |
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| 57 | |
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| 58 | void *qcom_tzmem_alloc(struct qcom_tzmem_pool *pool, size_t size, gfp_t gfp); |
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| 59 | void qcom_tzmem_free(void *ptr); |
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| 60 | |
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| 61 | DEFINE_FREE(qcom_tzmem, void *, if (_T) qcom_tzmem_free(_T)) |
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| 62 | |
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| 63 | phys_addr_t qcom_tzmem_to_phys(void *ptr); |
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| 64 | |
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| 65 | #if IS_ENABLED(CONFIG_QCOM_TZMEM_MODE_SHMBRIDGE) |
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| 66 | int qcom_tzmem_shm_bridge_create(phys_addr_t paddr, size_t size, u64 *handle); |
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| 67 | void qcom_tzmem_shm_bridge_delete(u64 handle); |
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| 68 | #else |
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| 69 | static inline int qcom_tzmem_shm_bridge_create(phys_addr_t paddr, |
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| 70 | size_t size, u64 *handle) |
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| 71 | { |
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| 72 | return 0; |
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| 73 | } |
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| 74 | |
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| 75 | static inline void qcom_tzmem_shm_bridge_delete(u64 handle) |
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| 76 | { |
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| 77 | } |
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| 78 | #endif |
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| 79 | |
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| 80 | #endif /* __QCOM_TZMEM */ |
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| 81 | |
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