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- /*
- * Copyright (C) 2016 Red Hat
- * Author: Rob Clark <robdclark@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
- #include "msm_drv.h"
- #include "msm_gem.h"
- #include "msm_mmu.h"
- static void
- msm_gem_address_space_destroy(struct kref *kref)
- {
- struct msm_gem_address_space *aspace = container_of(kref,
- struct msm_gem_address_space, kref);
- drm_mm_takedown(&aspace->mm);
- if (aspace->mmu)
- aspace->mmu->funcs->destroy(aspace->mmu);
- kfree(aspace);
- }
- void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
- {
- if (aspace)
- kref_put(&aspace->kref, msm_gem_address_space_destroy);
- }
- void
- msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
- struct msm_gem_vma *vma, struct sg_table *sgt)
- {
- if (!aspace || !vma->iova)
- return;
- if (aspace->mmu) {
- unsigned size = vma->node.size << PAGE_SHIFT;
- aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, sgt, size);
- }
- spin_lock(&aspace->lock);
- drm_mm_remove_node(&vma->node);
- spin_unlock(&aspace->lock);
- vma->iova = 0;
- msm_gem_address_space_put(aspace);
- }
- int
- msm_gem_map_vma(struct msm_gem_address_space *aspace,
- struct msm_gem_vma *vma, struct sg_table *sgt, int npages)
- {
- int ret;
- spin_lock(&aspace->lock);
- if (WARN_ON(drm_mm_node_allocated(&vma->node))) {
- spin_unlock(&aspace->lock);
- return 0;
- }
- ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages);
- spin_unlock(&aspace->lock);
- if (ret)
- return ret;
- vma->iova = vma->node.start << PAGE_SHIFT;
- if (aspace->mmu) {
- unsigned size = npages << PAGE_SHIFT;
- ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt,
- size, IOMMU_READ | IOMMU_WRITE);
- }
- /* Get a reference to the aspace to keep it around */
- kref_get(&aspace->kref);
- return ret;
- }
- struct msm_gem_address_space *
- msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain,
- const char *name)
- {
- struct msm_gem_address_space *aspace;
- u64 size = domain->geometry.aperture_end -
- domain->geometry.aperture_start;
- aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
- if (!aspace)
- return ERR_PTR(-ENOMEM);
- spin_lock_init(&aspace->lock);
- aspace->name = name;
- aspace->mmu = msm_iommu_new(dev, domain);
- drm_mm_init(&aspace->mm, (domain->geometry.aperture_start >> PAGE_SHIFT),
- size >> PAGE_SHIFT);
- kref_init(&aspace->kref);
- return aspace;
- }
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