253aacc2ad
The current rules for determining if a buffer can or cannot be mapped to depend on how a buffer was allocated. This is restrictive in environments where the security state of a buffer can change dynamically, as the accessibility of the buffer has to change with respect to the security state of the buffer. Thus, add support to track the number of userspace mappings associated with an ION buffer, as well as an interface to allow drivers to lock and unlock a buffer. In this context, locking a buffer means that the buffer will no longer be mappable, and the buffer does not have any outstanding mappings at the time the buffer is locked. Unlocking the buffer means that the buffer can be mapped again. Change-Id: I6aa73b9ac7c301b12106ad3d3bcb4c2aac959e55 Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
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*/
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#ifndef _MSM_ION_H
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#define _MSM_ION_H
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#include <linux/bitmap.h>
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#include <linux/device.h>
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#include <linux/dma-buf.h>
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#include <linux/scatterlist.h>
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#include <uapi/linux/msm_ion.h>
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struct ion_prefetch_region {
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u64 size;
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u32 vmid;
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};
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#if IS_ENABLED(CONFIG_ION_MSM_HEAPS)
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struct device *msm_ion_heap_device_by_id(int heap_id);
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static inline unsigned int ion_get_flags_num_vm_elems(unsigned int flags)
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{
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unsigned long vm_flags = flags & ION_FLAGS_CP_MASK;
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return ((unsigned int)bitmap_weight(&vm_flags, BITS_PER_LONG));
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}
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int ion_populate_vm_list(unsigned long flags, unsigned int *vm_list,
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int nelems);
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int msm_ion_heap_prefetch(int heap_id, struct ion_prefetch_region *regions,
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int nr_regions);
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int msm_ion_heap_drain(int heap_id, struct ion_prefetch_region *regions,
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int nr_regions);
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int get_ion_flags(u32 vmid);
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bool msm_ion_heap_is_secure(int heap_id);
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int msm_ion_heap_add_memory(int heap_id, struct sg_table *sgt);
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int msm_ion_heap_remove_memory(int heap_id, struct sg_table *sgt);
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int msm_ion_dma_buf_lock(struct dma_buf *dmabuf);
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void msm_ion_dma_buf_unlock(struct dma_buf *dmabuf);
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#else
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static inline struct device *msm_ion_heap_device_by_id(int heap_id)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline unsigned int ion_get_flags_num_vm_elems(unsigned int flags)
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{
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return 0;
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}
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static inline int ion_populate_vm_list(unsigned long flags,
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unsigned int *vm_list, int nelems)
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{
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return -EINVAL;
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}
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static inline int msm_ion_heap_prefetch(int heap_id,
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struct ion_prefetch_region *regions,
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int nr_regions)
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{
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return -ENODEV;
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}
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static inline int msm_ion_heap_drain(int heap_id,
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struct ion_prefetch_region *regions,
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int nr_regions)
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{
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return -ENODEV;
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}
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static inline int get_ion_flags(u32 vmid)
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{
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return -EINVAL;
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}
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static inline bool msm_ion_heap_is_secure(int heap_id)
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{
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return false;
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}
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static inline int msm_ion_heap_add_memory(int heap_id, struct sg_table *sgt)
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{
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return -ENODEV;
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}
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static inline int msm_ion_heap_remove_memory(int heap_id, struct sg_table *sgt)
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{
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return -ENODEV;
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}
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static inline int msm_ion_dma_buf_lock(struct dma_buf *dmabuf)
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{
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return -ENODEV;
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}
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static inline void msm_ion_dma_buf_unlock(struct dma_buf *dmabuf)
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{
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}
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#endif /* CONFIG_ION_MSM_HEAPS */
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#endif /* _MSM_ION_H */
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