e956ccee9f
In some cases, it may be adventageous to map more iommu virtual address space than there is actual buffer space. Add apis to map the extra iova space to a dummy buffer. Change-Id: I93420cddaac7256e95e98650bc59e61faf56e55e Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*
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* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __ARCH_MACH_MSM_SUBSYSTEM_MAP_H
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#define __ARCH_MACH_MSM_SUBSYSTEM_MAP_H
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#include <linux/iommu.h>
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#include <mach/iommu_domains.h>
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/* map the physical address in the kernel vaddr space */
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#define MSM_SUBSYSTEM_MAP_KADDR 0x1
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/* map the physical address in the iova address space */
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#define MSM_SUBSYSTEM_MAP_IOVA 0x2
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/* ioremaps in the kernel address space are cached */
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#define MSM_SUBSYSTEM_MAP_CACHED 0x4
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/* ioremaps in the kernel address space are uncached */
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#define MSM_SUBSYSTEM_MAP_UNCACHED 0x8
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/*
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* Will map 2x the length requested.
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*/
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#define MSM_SUBSYSTEM_MAP_IOMMU_2X 0x10
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/*
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* Shortcut flags for alignment.
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* The flag must be equal to the alignment requested.
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* e.g. for 8k alignment the flags must be (0x2000 | other flags)
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*/
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#define MSM_SUBSYSTEM_ALIGN_IOVA_8K SZ_8K
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#define MSM_SUBSYSTEM_ALIGN_IOVA_1M SZ_1M
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enum msm_subsystem_id {
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INVALID_SUBSYS_ID = -1,
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MSM_SUBSYSTEM_VIDEO,
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MSM_SUBSYSTEM_VIDEO_FWARE,
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MSM_SUBSYSTEM_CAMERA,
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MSM_SUBSYSTEM_DISPLAY,
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MSM_SUBSYSTEM_ROTATOR,
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MAX_SUBSYSTEM_ID
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};
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static inline int msm_subsystem_check_id(int subsys_id)
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{
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return subsys_id > INVALID_SUBSYS_ID && subsys_id < MAX_SUBSYSTEM_ID;
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}
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struct msm_mapped_buffer {
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/*
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* VA mapped in the kernel address space. This field shall be NULL if
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* MSM_SUBSYSTEM_MAP_KADDR was not passed to the map buffer function.
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*/
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void *vaddr;
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/*
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* iovas mapped in the iommu address space. The ith entry of this array
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* corresponds to the iova mapped in the ith subsystem in the array
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* pased in to msm_subsystem_map_buffer. This field shall be NULL if
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* MSM_SUBSYSTEM_MAP_IOVA was not passed to the map buffer function,
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*/
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unsigned long *iova;
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};
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extern struct msm_mapped_buffer *msm_subsystem_map_buffer(
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unsigned long phys,
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unsigned int length,
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unsigned int flags,
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int *subsys_ids,
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unsigned int nsubsys);
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extern int msm_subsystem_unmap_buffer(struct msm_mapped_buffer *buf);
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extern phys_addr_t msm_subsystem_check_iova_mapping(int subsys_id,
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unsigned long iova);
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#endif /* __ARCH_MACH_MSM_SUBSYSTEM_MAP_H */
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