165 lines
3.3 KiB
C
165 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2016 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*/
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#include "msm_drv.h"
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#include "msm_gem.h"
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#include "msm_mmu.h"
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static void
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msm_gem_address_space_destroy(struct kref *kref)
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{
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struct msm_gem_address_space *aspace = container_of(kref,
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struct msm_gem_address_space, kref);
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drm_mm_takedown(&aspace->mm);
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if (aspace->mmu)
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aspace->mmu->funcs->destroy(aspace->mmu);
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put_pid(aspace->pid);
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kfree(aspace);
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}
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void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
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{
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if (aspace)
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kref_put(&aspace->kref, msm_gem_address_space_destroy);
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}
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struct msm_gem_address_space *
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msm_gem_address_space_get(struct msm_gem_address_space *aspace)
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{
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if (!IS_ERR_OR_NULL(aspace))
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kref_get(&aspace->kref);
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return aspace;
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}
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/* Actually unmap memory for the vma */
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void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
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struct msm_gem_vma *vma)
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{
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unsigned size = vma->node.size << PAGE_SHIFT;
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/* Print a message if we try to purge a vma in use */
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if (WARN_ON(vma->inuse > 0))
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return;
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/* Don't do anything if the memory isn't mapped */
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if (!vma->mapped)
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return;
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if (aspace->mmu)
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aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, size);
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vma->mapped = false;
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}
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/* Remove reference counts for the mapping */
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void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
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struct msm_gem_vma *vma)
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{
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if (!WARN_ON(!vma->iova))
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vma->inuse--;
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}
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int
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msm_gem_map_vma(struct msm_gem_address_space *aspace,
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struct msm_gem_vma *vma, int prot,
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struct sg_table *sgt, int npages)
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{
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unsigned size = npages << PAGE_SHIFT;
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int ret = 0;
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if (WARN_ON(!vma->iova))
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return -EINVAL;
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/* Increase the usage counter */
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vma->inuse++;
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if (vma->mapped)
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return 0;
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vma->mapped = true;
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if (aspace && aspace->mmu)
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ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt,
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size, prot);
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if (ret) {
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vma->mapped = false;
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vma->inuse--;
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}
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return ret;
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}
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/* Close an iova. Warn if it is still in use */
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void msm_gem_close_vma(struct msm_gem_address_space *aspace,
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struct msm_gem_vma *vma)
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{
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if (WARN_ON(vma->inuse > 0 || vma->mapped))
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return;
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spin_lock(&aspace->lock);
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if (vma->iova)
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drm_mm_remove_node(&vma->node);
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spin_unlock(&aspace->lock);
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vma->iova = 0;
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msm_gem_address_space_put(aspace);
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}
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/* Initialize a new vma and allocate an iova for it */
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int msm_gem_init_vma(struct msm_gem_address_space *aspace,
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struct msm_gem_vma *vma, int npages,
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u64 range_start, u64 range_end)
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{
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int ret;
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if (WARN_ON(vma->iova))
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return -EBUSY;
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spin_lock(&aspace->lock);
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ret = drm_mm_insert_node_in_range(&aspace->mm, &vma->node, npages, 0,
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0, range_start, range_end, 0);
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spin_unlock(&aspace->lock);
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if (ret)
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return ret;
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vma->iova = vma->node.start << PAGE_SHIFT;
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vma->mapped = false;
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kref_get(&aspace->kref);
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return 0;
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}
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struct msm_gem_address_space *
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msm_gem_address_space_create(struct msm_mmu *mmu, const char *name,
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u64 va_start, u64 size)
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{
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struct msm_gem_address_space *aspace;
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if (IS_ERR(mmu))
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return ERR_CAST(mmu);
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aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
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if (!aspace)
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return ERR_PTR(-ENOMEM);
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spin_lock_init(&aspace->lock);
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aspace->name = name;
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aspace->mmu = mmu;
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drm_mm_init(&aspace->mm, va_start >> PAGE_SHIFT, size >> PAGE_SHIFT);
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kref_init(&aspace->kref);
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return aspace;
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}
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