mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-31 06:09:56 +00:00
e601ea31d6
Introduce a mechanism to count the worst case # of pages required in a
VM_BIND op.
Note that previously we would have had to somehow account for
allocations in unmap, when splitting a block. This behavior was removed
in commit 33729a5fc0 ("iommu/io-pgtable-arm: Remove split on unmap
behavior)"
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Tested-by: Antonino Maniscalco <antomani103@gmail.com>
Reviewed-by: Antonino Maniscalco <antomani103@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/661515/
96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2013 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*/
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#ifndef __MSM_MMU_H__
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#define __MSM_MMU_H__
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#include <linux/iommu.h>
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struct msm_mmu_prealloc;
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struct msm_mmu;
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struct msm_gpu;
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struct msm_mmu_funcs {
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void (*detach)(struct msm_mmu *mmu);
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void (*prealloc_count)(struct msm_mmu *mmu, struct msm_mmu_prealloc *p,
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uint64_t iova, size_t len);
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int (*prealloc_allocate)(struct msm_mmu *mmu, struct msm_mmu_prealloc *p);
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void (*prealloc_cleanup)(struct msm_mmu *mmu, struct msm_mmu_prealloc *p);
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int (*map)(struct msm_mmu *mmu, uint64_t iova, struct sg_table *sgt,
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size_t off, size_t len, int prot);
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int (*unmap)(struct msm_mmu *mmu, uint64_t iova, size_t len);
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void (*destroy)(struct msm_mmu *mmu);
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void (*set_stall)(struct msm_mmu *mmu, bool enable);
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};
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enum msm_mmu_type {
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MSM_MMU_GPUMMU,
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MSM_MMU_IOMMU,
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MSM_MMU_IOMMU_PAGETABLE,
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};
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/**
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* struct msm_mmu_prealloc - Tracking for pre-allocated pages for MMU updates.
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*/
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struct msm_mmu_prealloc {
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/** @count: Number of pages reserved. */
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uint32_t count;
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/** @ptr: Index of first unused page in @pages */
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uint32_t ptr;
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/**
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* @pages: Array of pages preallocated for MMU table updates.
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*
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* After a VM operation, there might be free pages remaining in this
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* array (since the amount allocated is a worst-case). These are
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* returned to the pt_cache at mmu->prealloc_cleanup().
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*/
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void **pages;
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};
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struct msm_mmu {
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const struct msm_mmu_funcs *funcs;
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struct device *dev;
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int (*handler)(void *arg, unsigned long iova, int flags, void *data);
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void *arg;
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enum msm_mmu_type type;
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/**
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* @prealloc: pre-allocated pages for pgtable
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*
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* Set while a VM_BIND job is running, serialized under
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* msm_gem_vm::mmu_lock.
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*/
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struct msm_mmu_prealloc *prealloc;
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};
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static inline void msm_mmu_init(struct msm_mmu *mmu, struct device *dev,
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const struct msm_mmu_funcs *funcs, enum msm_mmu_type type)
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{
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mmu->dev = dev;
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mmu->funcs = funcs;
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mmu->type = type;
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}
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struct msm_mmu *msm_iommu_new(struct device *dev, unsigned long quirks);
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struct msm_mmu *msm_iommu_gpu_new(struct device *dev, struct msm_gpu *gpu, unsigned long quirks);
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struct msm_mmu *msm_iommu_disp_new(struct device *dev, unsigned long quirks);
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static inline void msm_mmu_set_fault_handler(struct msm_mmu *mmu, void *arg,
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int (*handler)(void *arg, unsigned long iova, int flags, void *data))
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{
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mmu->arg = arg;
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mmu->handler = handler;
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}
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struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent, bool kernel_managed);
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int msm_iommu_pagetable_params(struct msm_mmu *mmu, phys_addr_t *ttbr,
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int *asid);
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int msm_iommu_pagetable_walk(struct msm_mmu *mmu, unsigned long iova, uint64_t ptes[4]);
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struct iommu_domain_geometry *msm_iommu_get_geometry(struct msm_mmu *mmu);
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#endif /* __MSM_MMU_H__ */
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