898db71bec
Bring over the prefetch and drain implementation from
drivers/staging/android/ion/heaps/ion_system_secure_heap.c from
msm-5.4, as of commit 48a845e5f683 ("ion: Use a freezable unbound
workqueue for the memory prefetch work items"), which is used for
asynchronously pre-loading the pools for clients who want the pools
filled with a certain amount of memory in advance of their use case
starting.
Change-Id: I5a2df4b75d86eb917cd0848107e7f920fb735434
Signed-off-by: Chris Goldsworthy <cgoldswo@codeaurora.org>
105 lines
3.7 KiB
C
105 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
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*/
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#ifndef _QCOM_DMA_HEAP_H
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#define _QCOM_DMA_HEAP_H
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#include <linux/bits.h>
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#include <linux/bitfield.h>
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#include <linux/dma-buf.h>
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#include <linux/qcom_dma_heap_dt_constants.h>
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#include <linux/err.h>
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/* Heap flags */
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#define QCOM_DMA_HEAP_FLAG_CACHED BIT(1)
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#define QCOM_DMA_HEAP_FLAG_CP_TRUSTED_VM BIT(15)
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#define QCOM_DMA_HEAP_FLAG_CP_TZ BIT(16)
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#define QCOM_DMA_HEAP_FLAG_CP_TOUCH BIT(17)
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#define QCOM_DMA_HEAP_FLAG_CP_BITSTREAM BIT(18)
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#define QCOM_DMA_HEAP_FLAG_CP_PIXEL BIT(19)
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#define QCOM_DMA_HEAP_FLAG_CP_NON_PIXEL BIT(20)
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#define QCOM_DMA_HEAP_FLAG_CP_CAMERA BIT(21)
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#define QCOM_DMA_HEAP_FLAG_CP_HLOS BIT(22)
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#define QCOM_DMA_HEAP_FLAG_CP_SPSS_SP BIT(23)
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#define QCOM_DMA_HEAP_FLAG_CP_SPSS_SP_SHARED BIT(24)
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#define QCOM_DMA_HEAP_FLAG_CP_SEC_DISPLAY BIT(25)
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#define QCOM_DMA_HEAP_FLAG_CP_APP BIT(26)
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#define QCOM_DMA_HEAP_FLAG_CP_CAMERA_PREVIEW BIT(27)
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#define QCOM_DMA_HEAP_FLAG_CP_MSS_MSA BIT(28)
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#define QCOM_DMA_HEAP_FLAG_CP_CDSP BIT(29)
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#define QCOM_DMA_HEAP_FLAG_CP_SPSS_HLOS_SHARED BIT(30)
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#define QCOM_DMA_HEAP_FLAGS_CP_MASK GENMASK(30, 15)
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#define QCOM_DMA_HEAP_FLAG_SECURE BIT(31)
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/**
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* carveout_heap_add_memory - Dynamically add reserved heap memory
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* @heap_name: The name of the DMA-BUF Heap we're giving memory to
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* @sgt: An SGT corresponding to the memory adding to the heap
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*
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* Return: 0 on success, a negative error value otherwise.
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*/
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int carveout_heap_add_memory(char *heap_name, struct sg_table *sgt);
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/**
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* carveout_heap_remove_memory - Dynamically remove reserved heap memory
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* @heap_name: The name of the DMA-BUF Heap we're taking memory away from
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* @sgt: An SGT corresponding to the memory we're removing from the heap
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*
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* Return: 0 on success, a negative error value otherwise.
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*/
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int carveout_heap_remove_memory(char *heap_name, struct sg_table *sgt);
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struct dma_buf_heap_prefetch_region {
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u64 size;
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struct dma_heap *heap;
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};
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int qcom_secure_system_heap_prefetch(struct dma_buf_heap_prefetch_region *regions,
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size_t nr_regions);
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int qcom_secure_system_heap_drain(struct dma_buf_heap_prefetch_region *regions,
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size_t nr_regions);
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/**
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* dma_buf_heap_hyp_assign - wrapper function for hyp-assigning a dma_buf
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* @buf: dma_buf to hyp-assign away from HLOS
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* @dest_vmids: array of QCOM_DMA_HEAP_FLAG VMIDs (as defined above)
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* @dest_perms: array of PERM_READ/PERM_WRITE/PERM_EXEC permission bits (as
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* defined in include/soc/qcom/secure_buffer.h), such that
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* dest_perms[i] specifies the permissions for VMID dest_vmids[i]
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* @dest_nelems: number of elements in dest_vmids and dest_perms
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*
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* Return: Temporarily return -EINVAL whilst the functon isn't present. Otherwise, return
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* 0 on success, or a negative value returned by hyp_assign_table() on failure.
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*/
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static inline int dma_buf_heap_hyp_assign(struct dma_buf *buf, int *dest_vmids, int *dest_perms,
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int dest_nelems)
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{
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return -EINVAL;
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}
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/**
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* dma_buf_heap_hyp_unassign - wrapper function that hyp-assigns a dma_buf back to HLOS
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* @buf: dma_buf to hyp-assign back to HLOS
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*
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* This function takes a dma_buf, and re-assigns it to HLOS with RWX permissions (at the
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* S2 level). The end-points to which the buffer was assigned to are tracked by the flags
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* kept in the msm_heap_helper_buffer->flags field (the helper_buffer is accesed through
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* dma_buf->priv), so the corresponding VMIDs don't need to be supplied as arguments.
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*
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* Return: Temporarily return -EINVAL whilst the functon isn't present. Otherwise, return
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* 0 on success, or a negative value returned by hyp_assign_table() on failure.
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*/
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static inline int dma_buf_heap_hyp_unassign(struct dma_buf *buf)
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{
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return -EINVAL;
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}
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#endif /* _QCOM_DMA_HEAP_H */
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