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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->ops->destroy)
aspace->ops->destroy(aspace);
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);
}
/* SDE address space operations */
static void smmu_aspace_unmap_vma(struct msm_gem_address_space *aspace,
struct msm_gem_vma *vma, struct sg_table *sgt,
void *priv)
{
struct dma_buf *buf = priv;
if (buf)
aspace->mmu->funcs->unmap_dma_buf(aspace->mmu,
sgt, buf, DMA_BIDIRECTIONAL);
else
aspace->mmu->funcs->unmap_sg(aspace->mmu, sgt,
DMA_BIDIRECTIONAL);
vma->iova = 0;
msm_gem_address_space_put(aspace);
}
static int smmu_aspace_map_vma(struct msm_gem_address_space *aspace,
struct msm_gem_vma *vma, struct sg_table *sgt,
void *priv, unsigned int flags)
{
struct dma_buf *buf = priv;
int ret;
if (buf)
ret = aspace->mmu->funcs->map_dma_buf(aspace->mmu, sgt, buf,
DMA_BIDIRECTIONAL);
else
ret = aspace->mmu->funcs->map_sg(aspace->mmu, sgt,
DMA_BIDIRECTIONAL);
if (!ret)
vma->iova = sg_dma_address(sgt->sgl);
/* Get a reference to the aspace to keep it around */
kref_get(&aspace->kref);
return ret;
}
static const struct msm_gem_aspace_ops smmu_aspace_ops = {
.map = smmu_aspace_map_vma,
.unmap = smmu_aspace_unmap_vma,
};
struct msm_gem_address_space *
msm_gem_smmu_address_space_create(struct device *dev, struct msm_mmu *mmu,
const char *name)
{
struct msm_gem_address_space *aspace;
if (!mmu)
return ERR_PTR(-EINVAL);
aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
if (!aspace)
return ERR_PTR(-ENOMEM);
aspace->name = name;
aspace->mmu = mmu;
aspace->ops = &smmu_aspace_ops;
kref_init(&aspace->kref);
return aspace;
}
/* GPU address space operations */
struct msm_iommu_aspace {
struct msm_gem_address_space base;
struct drm_mm mm;
};
#define to_iommu_aspace(aspace) \
((struct msm_iommu_aspace *) \
container_of(aspace, struct msm_iommu_aspace, base))
static void iommu_aspace_unmap_vma(struct msm_gem_address_space *aspace,
struct msm_gem_vma *vma, struct sg_table *sgt, void *priv)
{
if (!vma->iova)
return;
if (aspace->mmu)
aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, sgt);
drm_mm_remove_node(&vma->node);
vma->iova = 0;
msm_gem_address_space_put(aspace);
}
static int iommu_aspace_map_vma(struct msm_gem_address_space *aspace,
struct msm_gem_vma *vma, struct sg_table *sgt, void *priv,
unsigned int flags)
{
struct msm_iommu_aspace *local = to_iommu_aspace(aspace);
size_t size = 0;
struct scatterlist *sg;
int ret, i;
int iommu_flags = IOMMU_READ;
if (!(flags & MSM_BO_GPU_READONLY))
iommu_flags |= IOMMU_WRITE;
if (flags & MSM_BO_PRIVILEGED)
iommu_flags |= IOMMU_PRIV;
if ((flags & MSM_BO_CACHED) && msm_iommu_coherent(aspace->mmu))
iommu_flags |= IOMMU_CACHE;
if (WARN_ON(drm_mm_node_allocated(&vma->node)))
return 0;
for_each_sg(sgt->sgl, sg, sgt->nents, i)
size += sg->length + sg->offset;
ret = drm_mm_insert_node(&local->mm, &vma->node, size >> PAGE_SHIFT,
0, DRM_MM_SEARCH_DEFAULT);
if (ret)
return ret;
vma->iova = vma->node.start << PAGE_SHIFT;
if (aspace->mmu)
ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt,
iommu_flags);
/* Get a reference to the aspace to keep it around */
kref_get(&aspace->kref);
return ret;
}
static void iommu_aspace_destroy(struct msm_gem_address_space *aspace)
{
struct msm_iommu_aspace *local = to_iommu_aspace(aspace);
drm_mm_takedown(&local->mm);
aspace->mmu->funcs->destroy(aspace->mmu);
}
static const struct msm_gem_aspace_ops msm_iommu_aspace_ops = {
.map = iommu_aspace_map_vma,
.unmap = iommu_aspace_unmap_vma,
.destroy = iommu_aspace_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_iommu_aspace *local;
if (!mmu)
return ERR_PTR(-EINVAL);
local = kzalloc(sizeof(*local), GFP_KERNEL);
if (!local)
return ERR_PTR(-ENOMEM);
drm_mm_init(&local->mm, (start >> PAGE_SHIFT),
(end >> PAGE_SHIFT) - 1);
local->base.name = name;
local->base.mmu = mmu;
local->base.ops = &msm_iommu_aspace_ops;
kref_init(&local->base.kref);
return &local->base;
}
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)
{
if (aspace && aspace->ops->map)
return aspace->ops->map(aspace, vma, sgt, priv, flags);
return -EINVAL;
}
void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
struct msm_gem_vma *vma, struct sg_table *sgt, void *priv)
{
if (aspace && aspace->ops->unmap)
aspace->ops->unmap(aspace, vma, sgt, priv);
}
struct msm_gem_address_space *
msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain,
const char *name)
{
struct msm_mmu *mmu = msm_iommu_new(dev, 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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