Commit 4b85f7f5 authored by Rob Clark's avatar Rob Clark
Browse files

drm/msm: support for an arbitrary number of address spaces 



It means we have to do a list traversal where we once had an index into
a table.  But the list will normally have one or two entries.

Signed-off-by: default avatarRob Clark <robdclark@gmail.com>
parent f4839bd5

drivers/gpu/drm/msm/msm_gem.c

+96 −42
Original line number Diff line number Diff line
@@ -283,21 +283,59 @@ uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj) 
	return offset;

}



static struct msm_gem_vma *add_vma(struct drm_gem_object *obj,

		struct msm_gem_address_space *aspace)

{

	struct msm_gem_object *msm_obj = to_msm_bo(obj);

	struct msm_gem_vma *vma;



	vma = kzalloc(sizeof(*vma), GFP_KERNEL);

	if (!vma)

		return ERR_PTR(-ENOMEM);



	vma->aspace = aspace;



	list_add_tail(&vma->list, &msm_obj->vmas);



	return vma;

}



static struct msm_gem_vma *lookup_vma(struct drm_gem_object *obj,

		struct msm_gem_address_space *aspace)

{

	struct msm_gem_object *msm_obj = to_msm_bo(obj);

	struct msm_gem_vma *vma;



	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));



	list_for_each_entry(vma, &msm_obj->vmas, list) {

		if (vma->aspace == aspace)

			return vma;

	}



	return NULL;

}



static void del_vma(struct msm_gem_vma *vma)

{

	if (!vma)

		return;



	list_del(&vma->list);

	kfree(vma);

}



static void

put_iova(struct drm_gem_object *obj)

{

	struct drm_device *dev = obj->dev;

	struct msm_drm_private *priv = obj->dev->dev_private;

	struct msm_gem_object *msm_obj = to_msm_bo(obj);

	int id;

	struct msm_gem_vma *vma, *tmp;



	WARN_ON(!mutex_is_locked(&dev->struct_mutex));

	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));



	for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {

		if (!priv->aspace[id])

			continue;

		msm_gem_unmap_vma(priv->aspace[id],

				&msm_obj->domain[id], msm_obj->sgt);

	list_for_each_entry_safe(vma, tmp, &msm_obj->vmas, list) {

		msm_gem_unmap_vma(vma->aspace, vma, msm_obj->sgt);

		del_vma(vma);

	}

}
@@ -312,24 +350,37 @@ int msm_gem_get_iova_locked(struct drm_gem_object *obj, 
		struct msm_gem_address_space *aspace, uint64_t *iova)

{

	struct msm_gem_object *msm_obj = to_msm_bo(obj);

	int id = aspace ? aspace->id : 0;

	struct msm_gem_vma *vma;

	int ret = 0;



	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));



	if (!msm_obj->domain[id].iova) {

		struct msm_drm_private *priv = obj->dev->dev_private;

		struct page **pages = get_pages(obj);

	vma = lookup_vma(obj, aspace);



		if (IS_ERR(pages))

			return PTR_ERR(pages);

	if (!vma) {

		struct page **pages;



		vma = add_vma(obj, aspace);

		if (IS_ERR(vma))

			return PTR_ERR(vma);



		pages = get_pages(obj);

		if (IS_ERR(pages)) {

			ret = PTR_ERR(pages);

			goto fail;

		}



		ret = msm_gem_map_vma(priv->aspace[id], &msm_obj->domain[id],

				msm_obj->sgt, obj->size >> PAGE_SHIFT);

		ret = msm_gem_map_vma(aspace, vma, msm_obj->sgt,

				obj->size >> PAGE_SHIFT);

		if (ret)

			goto fail;

	}



	if (!ret)

		*iova = msm_obj->domain[id].iova;

	*iova = vma->iova;

	return 0;



fail:

	del_vma(vma);



	return ret;

}
@@ -338,22 +389,12 @@ int msm_gem_get_iova_locked(struct drm_gem_object *obj, 
int msm_gem_get_iova(struct drm_gem_object *obj,

		struct msm_gem_address_space *aspace, uint64_t *iova)

{

	struct msm_gem_object *msm_obj = to_msm_bo(obj);

	int id = aspace ? aspace->id : 0;

	int ret;



	/* this is safe right now because we don't unmap until the

	 * bo is deleted:

	 */

	if (msm_obj->domain[id].iova) {

		might_lock(&obj->dev->struct_mutex);

		*iova = msm_obj->domain[id].iova;

		return 0;

	}



	mutex_lock(&obj->dev->struct_mutex);

	ret = msm_gem_get_iova_locked(obj, aspace, iova);

	mutex_unlock(&obj->dev->struct_mutex);



	return ret;

}
@@ -363,10 +404,14 @@ int msm_gem_get_iova(struct drm_gem_object *obj, 
uint64_t msm_gem_iova(struct drm_gem_object *obj,

		struct msm_gem_address_space *aspace)

{

	struct msm_gem_object *msm_obj = to_msm_bo(obj);

	int id = aspace ? aspace->id : 0;

	WARN_ON(!msm_obj->domain[id].iova);

	return msm_obj->domain[id].iova;

	struct msm_gem_vma *vma;



	mutex_lock(&obj->dev->struct_mutex);

	vma = lookup_vma(obj, aspace);

	mutex_unlock(&obj->dev->struct_mutex);

	WARN_ON(!vma);



	return vma ? vma->iova : 0;

}



void msm_gem_put_iova(struct drm_gem_object *obj,
@@ -624,11 +669,10 @@ void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 
	struct msm_gem_object *msm_obj = to_msm_bo(obj);

	struct reservation_object *robj = msm_obj->resv;

	struct reservation_object_list *fobj;

	struct msm_drm_private *priv = obj->dev->dev_private;

	struct dma_fence *fence;

	struct msm_gem_vma *vma;

	uint64_t off = drm_vma_node_start(&obj->vma_node);

	const char *madv;

	unsigned id;



	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
@@ -650,8 +694,9 @@ void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 
			obj->name, kref_read(&obj->refcount),

			off, msm_obj->vaddr);



	for (id = 0; id < priv->num_aspaces; id++)

		seq_printf(m, " %08llx", msm_obj->domain[id].iova);

	/* FIXME: we need to print the address space here too */

	list_for_each_entry(vma, &msm_obj->vmas, list)

		seq_printf(m, " %08llx", vma->iova);



	seq_printf(m, " %zu%s\n", obj->size, madv);
@@ -790,6 +835,8 @@ static int msm_gem_new_impl(struct drm_device *dev, 
	}



	INIT_LIST_HEAD(&msm_obj->submit_entry);

	INIT_LIST_HEAD(&msm_obj->vmas);



	list_add_tail(&msm_obj->mm_list, &priv->inactive_list);



	*obj = &msm_obj->base;
@@ -828,19 +875,26 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev, 
		goto fail;



	if (use_vram) {

		struct msm_gem_object *msm_obj = to_msm_bo(obj);

		struct msm_gem_vma *vma;

		struct page **pages;



		msm_obj->vram_node = &msm_obj->domain[0].node;

		vma = add_vma(obj, NULL);

		if (IS_ERR(vma)) {

			ret = PTR_ERR(vma);

			goto fail;

		}



		to_msm_bo(obj)->vram_node = &vma->node;



		drm_gem_private_object_init(dev, obj, size);



		msm_obj->pages = get_pages(obj);

		pages = get_pages(obj);

		if (IS_ERR(pages)) {

			ret = PTR_ERR(pages);

			goto fail;

		}

		msm_obj->domain[0].iova = physaddr(obj);



		vma->iova = physaddr(obj);

	} else {

		ret = drm_gem_object_init(dev, obj, size);

		if (ret)

drivers/gpu/drm/msm/msm_gem.h

+3 −1
Original line number Diff line number Diff line
@@ -39,6 +39,8 @@ struct msm_gem_address_space { 
struct msm_gem_vma {

	struct drm_mm_node node;

	uint64_t iova;

	struct msm_gem_address_space *aspace;

	struct list_head list;    /* node in msm_gem_object::vmas */

};



struct msm_gem_object {
@@ -78,7 +80,7 @@ struct msm_gem_object { 
	struct sg_table *sgt;

	void *vaddr;



	struct msm_gem_vma domain[NUM_DOMAINS];

	struct list_head vmas;    /* list of msm_gem_vma */



	/* normally (resv == &_resv) except for imported bo's */

	struct reservation_object *resv;