On 16/01/2020 02:15, Rob Herring wrote:
> From: Boris Brezillon <boris.brezil...@collabora.com>
>
> With the introduction of per-FD address space, the same BO can be mapped
> in different address space if the BO is globally visible (GEM_FLINK)
> and opened in different context or if the dmabuf is self-imported. The
> current implementation does not take case into account, and attaches the
> mapping directly to the panfrost_gem_object.
>
> Let's create a panfrost_gem_mapping struct and allow multiple mappings
> per BO.
>
> The mappings are refcounted which helps solve another problem where
> mappings were torn down (GEM handle closed by userspace) while GPU
> jobs accessing those BOs were still in-flight. Jobs now keep a
> reference on the mappings they use.
>
> v2 (robh):
> - Minor review comment clean-ups from Steven
> - Use list_is_singular helper
> - Just WARN if we add a mapping when madvise state is not WILLNEED.
> With that, drop the use of object_name_lock.
>
> v3 (robh):
> - Revert returning list iterator in panfrost_gem_mapping_get()
>
> Fixes: a5efb4c9a562 ("drm/panfrost: Restructure the GEM object creation")
> Fixes: 7282f7645d06 ("drm/panfrost: Implement per FD address spaces")
> Cc: <sta...@vger.kernel.org>
> Signed-off-by: Boris Brezillon <boris.brezil...@collabora.com>
> Signed-off-by: Rob Herring <r...@kernel.org>
Reviewed-by: Steven Price <steven.pr...@arm.com>
Thanks,
Steve
> ---
> With the actual changes committed this time...
>
> drivers/gpu/drm/panfrost/panfrost_drv.c | 91 +++++++++++--
> drivers/gpu/drm/panfrost/panfrost_gem.c | 124 +++++++++++++++---
> drivers/gpu/drm/panfrost/panfrost_gem.h | 41 +++++-
> .../gpu/drm/panfrost/panfrost_gem_shrinker.c | 3 +-
> drivers/gpu/drm/panfrost/panfrost_job.c | 13 +-
> drivers/gpu/drm/panfrost/panfrost_job.h | 1 +
> drivers/gpu/drm/panfrost/panfrost_mmu.c | 61 +++++----
> drivers/gpu/drm/panfrost/panfrost_mmu.h | 6 +-
> drivers/gpu/drm/panfrost/panfrost_perfcnt.c | 34 +++--
> 9 files changed, 300 insertions(+), 74 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c
> b/drivers/gpu/drm/panfrost/panfrost_drv.c
> index f61364f7c471..88b431a267af 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
> @@ -78,8 +78,10 @@ static int panfrost_ioctl_get_param(struct drm_device
> *ddev, void *data, struct
> static int panfrost_ioctl_create_bo(struct drm_device *dev, void *data,
> struct drm_file *file)
> {
> + struct panfrost_file_priv *priv = file->driver_priv;
> struct panfrost_gem_object *bo;
> struct drm_panfrost_create_bo *args = data;
> + struct panfrost_gem_mapping *mapping;
>
> if (!args->size || args->pad ||
> (args->flags & ~(PANFROST_BO_NOEXEC | PANFROST_BO_HEAP)))
> @@ -95,7 +97,14 @@ static int panfrost_ioctl_create_bo(struct drm_device
> *dev, void *data,
> if (IS_ERR(bo))
> return PTR_ERR(bo);
>
> - args->offset = bo->node.start << PAGE_SHIFT;
> + mapping = panfrost_gem_mapping_get(bo, priv);
> + if (!mapping) {
> + drm_gem_object_put_unlocked(&bo->base.base);
> + return -EINVAL;
> + }
> +
> + args->offset = mapping->mmnode.start << PAGE_SHIFT;
> + panfrost_gem_mapping_put(mapping);
>
> return 0;
> }
> @@ -119,6 +128,11 @@ panfrost_lookup_bos(struct drm_device *dev,
> struct drm_panfrost_submit *args,
> struct panfrost_job *job)
> {
> + struct panfrost_file_priv *priv = file_priv->driver_priv;
> + struct panfrost_gem_object *bo;
> + unsigned int i;
> + int ret;
> +
> job->bo_count = args->bo_handle_count;
>
> if (!job->bo_count)
> @@ -130,9 +144,32 @@ panfrost_lookup_bos(struct drm_device *dev,
> if (!job->implicit_fences)
> return -ENOMEM;
>
> - return drm_gem_objects_lookup(file_priv,
> - (void __user
> *)(uintptr_t)args->bo_handles,
> - job->bo_count, &job->bos);
> + ret = drm_gem_objects_lookup(file_priv,
> + (void __user *)(uintptr_t)args->bo_handles,
> + job->bo_count, &job->bos);
> + if (ret)
> + return ret;
> +
> + job->mappings = kvmalloc_array(job->bo_count,
> + sizeof(struct panfrost_gem_mapping *),
> + GFP_KERNEL | __GFP_ZERO);
> + if (!job->mappings)
> + return -ENOMEM;
> +
> + for (i = 0; i < job->bo_count; i++) {
> + struct panfrost_gem_mapping *mapping;
> +
> + bo = to_panfrost_bo(job->bos[i]);
> + mapping = panfrost_gem_mapping_get(bo, priv);
> + if (!mapping) {
> + ret = -EINVAL;
> + break;
> + }
> +
> + job->mappings[i] = mapping;
> + }
> +
> + return ret;
> }
>
> /**
> @@ -320,7 +357,9 @@ static int panfrost_ioctl_mmap_bo(struct drm_device *dev,
> void *data,
> static int panfrost_ioctl_get_bo_offset(struct drm_device *dev, void *data,
> struct drm_file *file_priv)
> {
> + struct panfrost_file_priv *priv = file_priv->driver_priv;
> struct drm_panfrost_get_bo_offset *args = data;
> + struct panfrost_gem_mapping *mapping;
> struct drm_gem_object *gem_obj;
> struct panfrost_gem_object *bo;
>
> @@ -331,18 +370,26 @@ static int panfrost_ioctl_get_bo_offset(struct
> drm_device *dev, void *data,
> }
> bo = to_panfrost_bo(gem_obj);
>
> - args->offset = bo->node.start << PAGE_SHIFT;
> -
> + mapping = panfrost_gem_mapping_get(bo, priv);
> drm_gem_object_put_unlocked(gem_obj);
> +
> + if (!mapping)
> + return -EINVAL;
> +
> + args->offset = mapping->mmnode.start << PAGE_SHIFT;
> + panfrost_gem_mapping_put(mapping);
> return 0;
> }
>
> static int panfrost_ioctl_madvise(struct drm_device *dev, void *data,
> struct drm_file *file_priv)
> {
> + struct panfrost_file_priv *priv = file_priv->driver_priv;
> struct drm_panfrost_madvise *args = data;
> struct panfrost_device *pfdev = dev->dev_private;
> struct drm_gem_object *gem_obj;
> + struct panfrost_gem_object *bo;
> + int ret = 0;
>
> gem_obj = drm_gem_object_lookup(file_priv, args->handle);
> if (!gem_obj) {
> @@ -350,22 +397,48 @@ static int panfrost_ioctl_madvise(struct drm_device
> *dev, void *data,
> return -ENOENT;
> }
>
> + bo = to_panfrost_bo(gem_obj);
> +
> mutex_lock(&pfdev->shrinker_lock);
> + mutex_lock(&bo->mappings.lock);
> + if (args->madv == PANFROST_MADV_DONTNEED) {
> + struct panfrost_gem_mapping *first;
> +
> + first = list_first_entry(&bo->mappings.list,
> + struct panfrost_gem_mapping,
> + node);
> +
> + /*
> + * If we want to mark the BO purgeable, there must be only one
> + * user: the caller FD.
> + * We could do something smarter and mark the BO purgeable only
> + * when all its users have marked it purgeable, but globally
> + * visible/shared BOs are likely to never be marked purgeable
> + * anyway, so let's not bother.
> + */
> + if (!list_is_singular(&bo->mappings.list) ||
> + WARN_ON_ONCE(first->mmu != &priv->mmu)) {
> + ret = -EINVAL;
> + goto out_unlock_mappings;
> + }
> + }
> +
> args->retained = drm_gem_shmem_madvise(gem_obj, args->madv);
>
> if (args->retained) {
> - struct panfrost_gem_object *bo = to_panfrost_bo(gem_obj);
> -
> if (args->madv == PANFROST_MADV_DONTNEED)
> list_add_tail(&bo->base.madv_list,
> &pfdev->shrinker_list);
> else if (args->madv == PANFROST_MADV_WILLNEED)
> list_del_init(&bo->base.madv_list);
> }
> +
> +out_unlock_mappings:
> + mutex_unlock(&bo->mappings.lock);
> mutex_unlock(&pfdev->shrinker_lock);
>
> drm_gem_object_put_unlocked(gem_obj);
> - return 0;
> + return ret;
> }
>
> int panfrost_unstable_ioctl_check(void)
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c
> b/drivers/gpu/drm/panfrost/panfrost_gem.c
> index fd766b1395fb..17b654e1eb94 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gem.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c
> @@ -29,6 +29,12 @@ static void panfrost_gem_free_object(struct drm_gem_object
> *obj)
> list_del_init(&bo->base.madv_list);
> mutex_unlock(&pfdev->shrinker_lock);
>
> + /*
> + * If we still have mappings attached to the BO, there's a problem in
> + * our refcounting.
> + */
> + WARN_ON_ONCE(!list_empty(&bo->mappings.list));
> +
> if (bo->sgts) {
> int i;
> int n_sgt = bo->base.base.size / SZ_2M;
> @@ -46,6 +52,69 @@ static void panfrost_gem_free_object(struct drm_gem_object
> *obj)
> drm_gem_shmem_free_object(obj);
> }
>
> +struct panfrost_gem_mapping *
> +panfrost_gem_mapping_get(struct panfrost_gem_object *bo,
> + struct panfrost_file_priv *priv)
> +{
> + struct panfrost_gem_mapping *iter, *mapping = NULL;
> +
> + mutex_lock(&bo->mappings.lock);
> + list_for_each_entry(iter, &bo->mappings.list, node) {
> + if (iter->mmu == &priv->mmu) {
> + kref_get(&iter->refcount);
> + mapping = iter;
> + break;
> + }
> + }
> + mutex_unlock(&bo->mappings.lock);
> +
> + return mapping;
> +}
> +
> +static void
> +panfrost_gem_teardown_mapping(struct panfrost_gem_mapping *mapping)
> +{
> + struct panfrost_file_priv *priv;
> +
> + if (mapping->active)
> + panfrost_mmu_unmap(mapping);
> +
> + priv = container_of(mapping->mmu, struct panfrost_file_priv, mmu);
> + spin_lock(&priv->mm_lock);
> + if (drm_mm_node_allocated(&mapping->mmnode))
> + drm_mm_remove_node(&mapping->mmnode);
> + spin_unlock(&priv->mm_lock);
> +}
> +
> +static void panfrost_gem_mapping_release(struct kref *kref)
> +{
> + struct panfrost_gem_mapping *mapping;
> +
> + mapping = container_of(kref, struct panfrost_gem_mapping, refcount);
> +
> + panfrost_gem_teardown_mapping(mapping);
> + drm_gem_object_put_unlocked(&mapping->obj->base.base);
> + kfree(mapping);
> +}
> +
> +void panfrost_gem_mapping_put(struct panfrost_gem_mapping *mapping)
> +{
> + if (!mapping)
> + return;
> +
> + kref_put(&mapping->refcount, panfrost_gem_mapping_release);
> +}
> +
> +void panfrost_gem_teardown_mappings(struct panfrost_gem_object *bo)
> +{
> + struct panfrost_gem_mapping *mapping;
> +
> + mutex_lock(&bo->mappings.lock);
> + list_for_each_entry(mapping, &bo->mappings.list, node)
> + panfrost_gem_teardown_mapping(mapping);
> + mutex_unlock(&bo->mappings.lock);
> +}
> +
> int panfrost_gem_open(struct drm_gem_object *obj, struct drm_file *file_priv)
> {
> int ret;
> @@ -54,6 +123,16 @@ int panfrost_gem_open(struct drm_gem_object *obj, struct
> drm_file *file_priv)
> struct panfrost_gem_object *bo = to_panfrost_bo(obj);
> unsigned long color = bo->noexec ? PANFROST_BO_NOEXEC : 0;
> struct panfrost_file_priv *priv = file_priv->driver_priv;
> + struct panfrost_gem_mapping *mapping;
> +
> + mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
> + if (!mapping)
> + return -ENOMEM;
> +
> + INIT_LIST_HEAD(&mapping->node);
> + kref_init(&mapping->refcount);
> + drm_gem_object_get(obj);
> + mapping->obj = bo;
>
> /*
> * Executable buffers cannot cross a 16MB boundary as the program
> @@ -66,37 +145,48 @@ int panfrost_gem_open(struct drm_gem_object *obj, struct
> drm_file *file_priv)
> else
> align = size >= SZ_2M ? SZ_2M >> PAGE_SHIFT : 0;
>
> - bo->mmu = &priv->mmu;
> + mapping->mmu = &priv->mmu;
> spin_lock(&priv->mm_lock);
> - ret = drm_mm_insert_node_generic(&priv->mm, &bo->node,
> + ret = drm_mm_insert_node_generic(&priv->mm, &mapping->mmnode,
> size >> PAGE_SHIFT, align, color, 0);
> spin_unlock(&priv->mm_lock);
> if (ret)
> - return ret;
> + goto err;
>
> if (!bo->is_heap) {
> - ret = panfrost_mmu_map(bo);
> - if (ret) {
> - spin_lock(&priv->mm_lock);
> - drm_mm_remove_node(&bo->node);
> - spin_unlock(&priv->mm_lock);
> - }
> + ret = panfrost_mmu_map(mapping);
> + if (ret)
> + goto err;
> }
> +
> + mutex_lock(&bo->mappings.lock);
> + WARN_ON(bo->base.madv != PANFROST_MADV_WILLNEED);
> + list_add_tail(&mapping->node, &bo->mappings.list);
> + mutex_unlock(&bo->mappings.lock);
> +
> +err:
> + if (ret)
> + panfrost_gem_mapping_put(mapping);
> return ret;
> }
>
> void panfrost_gem_close(struct drm_gem_object *obj, struct drm_file
> *file_priv)
> {
> - struct panfrost_gem_object *bo = to_panfrost_bo(obj);
> struct panfrost_file_priv *priv = file_priv->driver_priv;
> + struct panfrost_gem_object *bo = to_panfrost_bo(obj);
> + struct panfrost_gem_mapping *mapping = NULL, *iter;
>
> - if (bo->is_mapped)
> - panfrost_mmu_unmap(bo);
> + mutex_lock(&bo->mappings.lock);
> + list_for_each_entry(iter, &bo->mappings.list, node) {
> + if (iter->mmu == &priv->mmu) {
> + mapping = iter;
> + list_del(&iter->node);
> + break;
> + }
> + }
> + mutex_unlock(&bo->mappings.lock);
>
> - spin_lock(&priv->mm_lock);
> - if (drm_mm_node_allocated(&bo->node))
> - drm_mm_remove_node(&bo->node);
> - spin_unlock(&priv->mm_lock);
> + panfrost_gem_mapping_put(mapping);
> }
>
> static int panfrost_gem_pin(struct drm_gem_object *obj)
> @@ -136,6 +226,8 @@ struct drm_gem_object *panfrost_gem_create_object(struct
> drm_device *dev, size_t
> if (!obj)
> return NULL;
>
> + INIT_LIST_HEAD(&obj->mappings.list);
> + mutex_init(&obj->mappings.lock);
> obj->base.base.funcs = &panfrost_gem_funcs;
>
> return &obj->base.base;
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h
> b/drivers/gpu/drm/panfrost/panfrost_gem.h
> index 4b17e7308764..ca1bc9019600 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gem.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_gem.h
> @@ -13,23 +13,46 @@ struct panfrost_gem_object {
> struct drm_gem_shmem_object base;
> struct sg_table *sgts;
>
> - struct panfrost_mmu *mmu;
> - struct drm_mm_node node;
> - bool is_mapped :1;
> + /*
> + * Use a list for now. If searching a mapping ever becomes the
> + * bottleneck, we should consider using an RB-tree, or even better,
> + * let the core store drm_gem_object_mapping entries (where we
> + * could place driver specific data) instead of drm_gem_object ones
> + * in its drm_file->object_idr table.
> + *
> + * struct drm_gem_object_mapping {
> + * struct drm_gem_object *obj;
> + * void *driver_priv;
> + * };
> + */
> + struct {
> + struct list_head list;
> + struct mutex lock;
> + } mappings;
> +
> bool noexec :1;
> bool is_heap :1;
> };
>
> +struct panfrost_gem_mapping {
> + struct list_head node;
> + struct kref refcount;
> + struct panfrost_gem_object *obj;
> + struct drm_mm_node mmnode;
> + struct panfrost_mmu *mmu;
> + bool active :1;
> +};
> +
> static inline
> struct panfrost_gem_object *to_panfrost_bo(struct drm_gem_object *obj)
> {
> return container_of(to_drm_gem_shmem_obj(obj), struct
> panfrost_gem_object, base);
> }
>
> -static inline
> -struct panfrost_gem_object *drm_mm_node_to_panfrost_bo(struct drm_mm_node
> *node)
> +static inline struct panfrost_gem_mapping *
> +drm_mm_node_to_panfrost_mapping(struct drm_mm_node *node)
> {
> - return container_of(node, struct panfrost_gem_object, node);
> + return container_of(node, struct panfrost_gem_mapping, mmnode);
> }
>
> struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev,
> size_t size);
> @@ -49,6 +72,12 @@ int panfrost_gem_open(struct drm_gem_object *obj, struct
> drm_file *file_priv);
> void panfrost_gem_close(struct drm_gem_object *obj,
> struct drm_file *file_priv);
>
> +struct panfrost_gem_mapping *
> +panfrost_gem_mapping_get(struct panfrost_gem_object *bo,
> + struct panfrost_file_priv *priv);
> +void panfrost_gem_mapping_put(struct panfrost_gem_mapping *mapping);
> +void panfrost_gem_teardown_mappings(struct panfrost_gem_object *bo);
> +
> void panfrost_gem_shrinker_init(struct drm_device *dev);
> void panfrost_gem_shrinker_cleanup(struct drm_device *dev);
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
> b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
> index 458f0fa68111..f5dd7b29bc95 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
> @@ -39,11 +39,12 @@ panfrost_gem_shrinker_count(struct shrinker *shrinker,
> struct shrink_control *sc
> static bool panfrost_gem_purge(struct drm_gem_object *obj)
> {
> struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
> + struct panfrost_gem_object *bo = to_panfrost_bo(obj);
>
> if (!mutex_trylock(&shmem->pages_lock))
> return false;
>
> - panfrost_mmu_unmap(to_panfrost_bo(obj));
> + panfrost_gem_teardown_mappings(bo);
> drm_gem_shmem_purge_locked(obj);
>
> mutex_unlock(&shmem->pages_lock);
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c
> b/drivers/gpu/drm/panfrost/panfrost_job.c
> index d411eb6c8eb9..e364ee00f3d0 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
> @@ -268,9 +268,20 @@ static void panfrost_job_cleanup(struct kref *ref)
> dma_fence_put(job->done_fence);
> dma_fence_put(job->render_done_fence);
>
> - if (job->bos) {
> + if (job->mappings) {
> for (i = 0; i < job->bo_count; i++)
> + panfrost_gem_mapping_put(job->mappings[i]);
> + kvfree(job->mappings);
> + }
> +
> + if (job->bos) {
> + struct panfrost_gem_object *bo;
> +
> + for (i = 0; i < job->bo_count; i++) {
> + bo = to_panfrost_bo(job->bos[i]);
> drm_gem_object_put_unlocked(job->bos[i]);
> + }
> +
> kvfree(job->bos);
> }
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.h
> b/drivers/gpu/drm/panfrost/panfrost_job.h
> index 62454128a792..bbd3ba97ff67 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.h
> @@ -32,6 +32,7 @@ struct panfrost_job {
>
> /* Exclusive fences we have taken from the BOs to wait for */
> struct dma_fence **implicit_fences;
> + struct panfrost_gem_mapping **mappings;
> struct drm_gem_object **bos;
> u32 bo_count;
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> index a3ed64a1f15e..763cfca886a7 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> @@ -269,14 +269,15 @@ static int mmu_map_sg(struct panfrost_device *pfdev,
> struct panfrost_mmu *mmu,
> return 0;
> }
>
> -int panfrost_mmu_map(struct panfrost_gem_object *bo)
> +int panfrost_mmu_map(struct panfrost_gem_mapping *mapping)
> {
> + struct panfrost_gem_object *bo = mapping->obj;
> struct drm_gem_object *obj = &bo->base.base;
> struct panfrost_device *pfdev = to_panfrost_device(obj->dev);
> struct sg_table *sgt;
> int prot = IOMMU_READ | IOMMU_WRITE;
>
> - if (WARN_ON(bo->is_mapped))
> + if (WARN_ON(mapping->active))
> return 0;
>
> if (bo->noexec)
> @@ -286,25 +287,28 @@ int panfrost_mmu_map(struct panfrost_gem_object *bo)
> if (WARN_ON(IS_ERR(sgt)))
> return PTR_ERR(sgt);
>
> - mmu_map_sg(pfdev, bo->mmu, bo->node.start << PAGE_SHIFT, prot, sgt);
> - bo->is_mapped = true;
> + mmu_map_sg(pfdev, mapping->mmu, mapping->mmnode.start << PAGE_SHIFT,
> + prot, sgt);
> + mapping->active = true;
>
> return 0;
> }
>
> -void panfrost_mmu_unmap(struct panfrost_gem_object *bo)
> +void panfrost_mmu_unmap(struct panfrost_gem_mapping *mapping)
> {
> + struct panfrost_gem_object *bo = mapping->obj;
> struct drm_gem_object *obj = &bo->base.base;
> struct panfrost_device *pfdev = to_panfrost_device(obj->dev);
> - struct io_pgtable_ops *ops = bo->mmu->pgtbl_ops;
> - u64 iova = bo->node.start << PAGE_SHIFT;
> - size_t len = bo->node.size << PAGE_SHIFT;
> + struct io_pgtable_ops *ops = mapping->mmu->pgtbl_ops;
> + u64 iova = mapping->mmnode.start << PAGE_SHIFT;
> + size_t len = mapping->mmnode.size << PAGE_SHIFT;
> size_t unmapped_len = 0;
>
> - if (WARN_ON(!bo->is_mapped))
> + if (WARN_ON(!mapping->active))
> return;
>
> - dev_dbg(pfdev->dev, "unmap: as=%d, iova=%llx, len=%zx", bo->mmu->as,
> iova, len);
> + dev_dbg(pfdev->dev, "unmap: as=%d, iova=%llx, len=%zx",
> + mapping->mmu->as, iova, len);
>
> while (unmapped_len < len) {
> size_t unmapped_page;
> @@ -318,8 +322,9 @@ void panfrost_mmu_unmap(struct panfrost_gem_object *bo)
> unmapped_len += pgsize;
> }
>
> - panfrost_mmu_flush_range(pfdev, bo->mmu, bo->node.start << PAGE_SHIFT,
> len);
> - bo->is_mapped = false;
> + panfrost_mmu_flush_range(pfdev, mapping->mmu,
> + mapping->mmnode.start << PAGE_SHIFT, len);
> + mapping->active = false;
> }
>
> static void mmu_tlb_inv_context_s1(void *cookie)
> @@ -394,10 +399,10 @@ void panfrost_mmu_pgtable_free(struct
> panfrost_file_priv *priv)
> free_io_pgtable_ops(mmu->pgtbl_ops);
> }
>
> -static struct panfrost_gem_object *
> -addr_to_drm_mm_node(struct panfrost_device *pfdev, int as, u64 addr)
> +static struct panfrost_gem_mapping *
> +addr_to_mapping(struct panfrost_device *pfdev, int as, u64 addr)
> {
> - struct panfrost_gem_object *bo = NULL;
> + struct panfrost_gem_mapping *mapping = NULL;
> struct panfrost_file_priv *priv;
> struct drm_mm_node *node;
> u64 offset = addr >> PAGE_SHIFT;
> @@ -418,8 +423,9 @@ addr_to_drm_mm_node(struct panfrost_device *pfdev, int
> as, u64 addr)
> drm_mm_for_each_node(node, &priv->mm) {
> if (offset >= node->start &&
> offset < (node->start + node->size)) {
> - bo = drm_mm_node_to_panfrost_bo(node);
> - drm_gem_object_get(&bo->base.base);
> + mapping = drm_mm_node_to_panfrost_mapping(node);
> +
> + kref_get(&mapping->refcount);
> break;
> }
> }
> @@ -427,7 +433,7 @@ addr_to_drm_mm_node(struct panfrost_device *pfdev, int
> as, u64 addr)
> spin_unlock(&priv->mm_lock);
> out:
> spin_unlock(&pfdev->as_lock);
> - return bo;
> + return mapping;
> }
>
> #define NUM_FAULT_PAGES (SZ_2M / PAGE_SIZE)
> @@ -436,28 +442,30 @@ static int panfrost_mmu_map_fault_addr(struct
> panfrost_device *pfdev, int as,
> u64 addr)
> {
> int ret, i;
> + struct panfrost_gem_mapping *bomapping;
> struct panfrost_gem_object *bo;
> struct address_space *mapping;
> pgoff_t page_offset;
> struct sg_table *sgt;
> struct page **pages;
>
> - bo = addr_to_drm_mm_node(pfdev, as, addr);
> - if (!bo)
> + bomapping = addr_to_mapping(pfdev, as, addr);
> + if (!bomapping)
> return -ENOENT;
>
> + bo = bomapping->obj;
> if (!bo->is_heap) {
> dev_WARN(pfdev->dev, "matching BO is not heap type (GPU VA =
> %llx)",
> - bo->node.start << PAGE_SHIFT);
> + bomapping->mmnode.start << PAGE_SHIFT);
> ret = -EINVAL;
> goto err_bo;
> }
> - WARN_ON(bo->mmu->as != as);
> + WARN_ON(bomapping->mmu->as != as);
>
> /* Assume 2MB alignment and size multiple */
> addr &= ~((u64)SZ_2M - 1);
> page_offset = addr >> PAGE_SHIFT;
> - page_offset -= bo->node.start;
> + page_offset -= bomapping->mmnode.start;
>
> mutex_lock(&bo->base.pages_lock);
>
> @@ -509,13 +517,14 @@ static int panfrost_mmu_map_fault_addr(struct
> panfrost_device *pfdev, int as,
> goto err_map;
> }
>
> - mmu_map_sg(pfdev, bo->mmu, addr, IOMMU_WRITE | IOMMU_READ |
> IOMMU_NOEXEC, sgt);
> + mmu_map_sg(pfdev, bomapping->mmu, addr,
> + IOMMU_WRITE | IOMMU_READ | IOMMU_NOEXEC, sgt);
>
> - bo->is_mapped = true;
> + bomapping->active = true;
>
> dev_dbg(pfdev->dev, "mapped page fault @ AS%d %llx", as, addr);
>
> - drm_gem_object_put_unlocked(&bo->base.base);
> + panfrost_gem_mapping_put(bomapping);
>
> return 0;
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.h
> b/drivers/gpu/drm/panfrost/panfrost_mmu.h
> index 7c5b6775ae23..44fc2edf63ce 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.h
> @@ -4,12 +4,12 @@
> #ifndef __PANFROST_MMU_H__
> #define __PANFROST_MMU_H__
>
> -struct panfrost_gem_object;
> +struct panfrost_gem_mapping;
> struct panfrost_file_priv;
> struct panfrost_mmu;
>
> -int panfrost_mmu_map(struct panfrost_gem_object *bo);
> -void panfrost_mmu_unmap(struct panfrost_gem_object *bo);
> +int panfrost_mmu_map(struct panfrost_gem_mapping *mapping);
> +void panfrost_mmu_unmap(struct panfrost_gem_mapping *mapping);
>
> int panfrost_mmu_init(struct panfrost_device *pfdev);
> void panfrost_mmu_fini(struct panfrost_device *pfdev);
> diff --git a/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
> b/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
> index 2c04e858c50a..684820448be3 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
> @@ -25,7 +25,7 @@
> #define V4_SHADERS_PER_COREGROUP 4
>
> struct panfrost_perfcnt {
> - struct panfrost_gem_object *bo;
> + struct panfrost_gem_mapping *mapping;
> size_t bosize;
> void *buf;
> struct panfrost_file_priv *user;
> @@ -49,7 +49,7 @@ static int panfrost_perfcnt_dump_locked(struct
> panfrost_device *pfdev)
> int ret;
>
> reinit_completion(&pfdev->perfcnt->dump_comp);
> - gpuva = pfdev->perfcnt->bo->node.start << PAGE_SHIFT;
> + gpuva = pfdev->perfcnt->mapping->mmnode.start << PAGE_SHIFT;
> gpu_write(pfdev, GPU_PERFCNT_BASE_LO, gpuva);
> gpu_write(pfdev, GPU_PERFCNT_BASE_HI, gpuva >> 32);
> gpu_write(pfdev, GPU_INT_CLEAR,
> @@ -89,17 +89,22 @@ static int panfrost_perfcnt_enable_locked(struct
> panfrost_device *pfdev,
> if (IS_ERR(bo))
> return PTR_ERR(bo);
>
> - perfcnt->bo = to_panfrost_bo(&bo->base);
> -
> /* Map the perfcnt buf in the address space attached to file_priv. */
> - ret = panfrost_gem_open(&perfcnt->bo->base.base, file_priv);
> + ret = panfrost_gem_open(&bo->base, file_priv);
> if (ret)
> goto err_put_bo;
>
> + perfcnt->mapping = panfrost_gem_mapping_get(to_panfrost_bo(&bo->base),
> + user);
> + if (!perfcnt->mapping) {
> + ret = -EINVAL;
> + goto err_close_bo;
> + }
> +
> perfcnt->buf = drm_gem_shmem_vmap(&bo->base);
> if (IS_ERR(perfcnt->buf)) {
> ret = PTR_ERR(perfcnt->buf);
> - goto err_close_bo;
> + goto err_put_mapping;
> }
>
> /*
> @@ -154,12 +159,17 @@ static int panfrost_perfcnt_enable_locked(struct
> panfrost_device *pfdev,
> if (panfrost_has_hw_issue(pfdev, HW_ISSUE_8186))
> gpu_write(pfdev, GPU_PRFCNT_TILER_EN, 0xffffffff);
>
> + /* The BO ref is retained by the mapping. */
> + drm_gem_object_put_unlocked(&bo->base);
> +
> return 0;
>
> err_vunmap:
> - drm_gem_shmem_vunmap(&perfcnt->bo->base.base, perfcnt->buf);
> + drm_gem_shmem_vunmap(&bo->base, perfcnt->buf);
> +err_put_mapping:
> + panfrost_gem_mapping_put(perfcnt->mapping);
> err_close_bo:
> - panfrost_gem_close(&perfcnt->bo->base.base, file_priv);
> + panfrost_gem_close(&bo->base, file_priv);
> err_put_bo:
> drm_gem_object_put_unlocked(&bo->base);
> return ret;
> @@ -182,11 +192,11 @@ static int panfrost_perfcnt_disable_locked(struct
> panfrost_device *pfdev,
> GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_OFF));
>
> perfcnt->user = NULL;
> - drm_gem_shmem_vunmap(&perfcnt->bo->base.base, perfcnt->buf);
> + drm_gem_shmem_vunmap(&perfcnt->mapping->obj->base.base, perfcnt->buf);
> perfcnt->buf = NULL;
> - panfrost_gem_close(&perfcnt->bo->base.base, file_priv);
> - drm_gem_object_put_unlocked(&perfcnt->bo->base.base);
> - perfcnt->bo = NULL;
> + panfrost_gem_close(&perfcnt->mapping->obj->base.base, file_priv);
> + panfrost_gem_mapping_put(perfcnt->mapping);
> + perfcnt->mapping = NULL;
> pm_runtime_mark_last_busy(pfdev->dev);
> pm_runtime_put_autosuspend(pfdev->dev);
>
>
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