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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_iommu.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);
if (aspace->va_len)
drm_mm_takedown(&aspace->mm);
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);
}
static struct msm_gem_address_space *
msm_gem_address_space_new(struct msm_mmu *mmu, const char *name,
uint64_t start, uint64_t end)
{
struct msm_gem_address_space *aspace;
if (!mmu)
return ERR_PTR(-EINVAL);
aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
if (!aspace)
return ERR_PTR(-ENOMEM);
spin_lock_init(&aspace->lock);
aspace->name = name;
aspace->mmu = mmu;
aspace->va_len = end - start;
if (aspace->va_len)
drm_mm_init(&aspace->mm, (start >> PAGE_SHIFT),
(aspace->va_len >> PAGE_SHIFT));
kref_init(&aspace->kref);
return aspace;
}
static int allocate_iova(struct msm_gem_address_space *aspace,
struct msm_gem_vma *vma, struct sg_table *sgt,
u64 *iova)
{
struct scatterlist *sg;
size_t size = 0;
int ret, i;
if (!aspace->va_len)
return 0;
for_each_sg(sgt->sgl, sg, sgt->nents, i)
size += sg->length + sg->offset;
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,
size >> PAGE_SHIFT, 0, DRM_MM_SEARCH_BOTTOM_UP);
spin_unlock(&aspace->lock);
if (!ret && iova)
*iova = vma->node.start << PAGE_SHIFT;
return ret;
}
int msm_gem_reserve_iova(struct msm_gem_address_space *aspace,
struct msm_gem_vma *vma,
uint64_t hostptr, uint64_t size)
{
struct drm_mm *mm = &aspace->mm;
uint64_t start = hostptr >> PAGE_SHIFT;
uint64_t last = (hostptr + size - 1) >> PAGE_SHIFT;
int ret;
spin_lock(&aspace->lock);
if (drm_mm_interval_first(mm, start, last)) {
/* iova already in use, fail */
spin_unlock(&aspace->lock);
return -EADDRINUSE;
}
vma->node.start = hostptr >> PAGE_SHIFT;
vma->node.size = size >> PAGE_SHIFT;
vma->node.color = 0;
ret = drm_mm_reserve_node(mm, &vma->node);
if (!ret)
vma->iova = hostptr;
spin_unlock(&aspace->lock);
return ret;
}
void msm_gem_release_iova(struct msm_gem_address_space *aspace,
struct msm_gem_vma *vma)
{
spin_lock(&aspace->lock);
if (drm_mm_node_allocated(&vma->node))
drm_mm_remove_node(&vma->node);
spin_unlock(&aspace->lock);
}
int msm_gem_map_vma(struct msm_gem_address_space *aspace,
struct msm_gem_vma *vma, struct sg_table *sgt,
void *priv, unsigned int flags)
{
u64 iova = 0;
int ret;
if (!aspace)
return -EINVAL;
ret = allocate_iova(aspace, vma, sgt, &iova);
if (ret)
return ret;
ret = aspace->mmu->funcs->map(aspace->mmu, iova, sgt,
flags, priv);
if (ret) {
msm_gem_release_iova(aspace, vma);
return ret;
}
vma->iova = sg_dma_address(sgt->sgl);
kref_get(&aspace->kref);
return 0;
}
void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
struct msm_gem_vma *vma, struct sg_table *sgt,
void *priv, bool invalidated)
{
if (!aspace || !vma->iova)
return;
if (!invalidated)
aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, sgt, priv);
msm_gem_release_iova(aspace, vma);
vma->iova = 0;
msm_gem_address_space_put(aspace);
}
struct msm_gem_address_space *
msm_gem_smmu_address_space_create(struct device *dev, struct msm_mmu *mmu,
const char *name)
{
return msm_gem_address_space_new(mmu, name, 0, 0);
}
struct msm_gem_address_space *
msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain,
int type, const char *name)
{
struct msm_mmu *mmu = msm_iommu_new(dev, type, domain);
if (IS_ERR(mmu))
return (struct msm_gem_address_space *) mmu;
return msm_gem_address_space_new(mmu, name,
domain->geometry.aperture_start,
domain->geometry.aperture_end);
}
/* Create a new dynamic instance */
struct msm_gem_address_space *
msm_gem_address_space_create_instance(struct msm_mmu *parent, const char *name,
uint64_t start, uint64_t end)
{
struct msm_mmu *child = msm_iommu_new_dynamic(parent);
if (IS_ERR(child))
return (struct msm_gem_address_space *) child;
return msm_gem_address_space_new(child, name, start, end);
}
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