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drm/msm: Count how many times iova memory is pinned

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Add a reference count to track how many times a particular
chunk of iova memory is pinned (mapped) in the iomu and
add msm_gem_unpin_iova to give up references.

It is important to note that msm_gem_unpin_iova replaces
msm_gem_put_iova because the new implicit behavior
that an assigned iova in a given vma is now valid for the
life of the buffer and what we are really focusing on is
the use of that iova.

For now the unmappings are lazy; once the reference counts
go to zero they *COULD* be unmapped dynamically but that
will require an outside force such as a shrinker or
mm_notifiers.  For now, we're just focusing on getting
the counting right and setting ourselves up to be ready
for the future.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Jordan Crouse
2018-11-07 15:35:51 -07:00
committed by Rob Clark
parent 9fe041f6fd
commit 7ad0e8cf63
15 changed files with 88 additions and 49 deletions
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43
drivers/gpu/drm/msm/msm_gem.c
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@@ -352,7 +352,8 @@ put_iova(struct drm_gem_object *obj)
WARN_ON(!mutex_is_locked(&msm_obj->lock));
list_for_each_entry_safe(vma, tmp, &msm_obj->vmas, list) {
msm_gem_unmap_vma(vma->aspace, vma);
msm_gem_purge_vma(vma->aspace, vma);
msm_gem_close_vma(vma->aspace, vma);
del_vma(vma);
}
}
@@ -430,7 +431,10 @@ int msm_gem_get_and_pin_iova(struct drm_gem_object *obj,
return ret;
}
/* Get an iova but don't pin the memory behind it */
/*
* Get an iova but don't pin it. Doesn't need a put because iovas are currently
* valid for the life of the object
*/
int msm_gem_get_iova(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace, uint64_t *iova)
{
@@ -444,7 +448,6 @@ int msm_gem_get_iova(struct drm_gem_object *obj,
return ret;
}
/* get iova without taking a reference, used in places where you have
* already done a 'msm_gem_get_and_pin_iova' or 'msm_gem_get_iova'
*/
@@ -462,15 +465,24 @@ uint64_t msm_gem_iova(struct drm_gem_object *obj,
return vma ? vma->iova : 0;
}
void msm_gem_put_iova(struct drm_gem_object *obj,
/*
* Unpin a iova by updating the reference counts. The memory isn't actually
* purged until something else (shrinker, mm_notifier, destroy, etc) decides
* to get rid of it
*/
void msm_gem_unpin_iova(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace)
{
// XXX TODO ..
// NOTE: probably don't need a _locked() version.. we wouldn't
// normally unmap here, but instead just mark that it could be
// unmapped (if the iova refcnt drops to zero), but then later
// if another _get_iova_locked() fails we can start unmapping
// things that are no longer needed..
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_gem_vma *vma;
mutex_lock(&msm_obj->lock);
vma = lookup_vma(obj, aspace);
if (!WARN_ON(!vma))
msm_gem_unmap_vma(aspace, vma);
mutex_unlock(&msm_obj->lock);
}
int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
@@ -786,11 +798,12 @@ void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
if (!list_empty(&msm_obj->vmas)) {
seq_puts(m, " vmas:");
seq_puts(m, " vmas:");
list_for_each_entry(vma, &msm_obj->vmas, list)
seq_printf(m, " [%s: %08llx,%s]", vma->aspace->name,
vma->iova, vma->mapped ? "mapped" : "unmapped");
seq_printf(m, " [%s: %08llx,%s,inuse=%d]", vma->aspace->name,
vma->iova, vma->mapped ? "mapped" : "unmapped",
vma->inuse);
seq_puts(m, "\n");
}
@@ -1093,7 +1106,7 @@ static void *_msm_gem_kernel_new(struct drm_device *dev, uint32_t size,
vaddr = msm_gem_get_vaddr(obj);
if (IS_ERR(vaddr)) {
msm_gem_put_iova(obj, aspace);
msm_gem_unpin_iova(obj, aspace);
ret = PTR_ERR(vaddr);
goto err;
}
@@ -1133,7 +1146,7 @@ void msm_gem_kernel_put(struct drm_gem_object *bo,
return;
msm_gem_put_vaddr(bo);
msm_gem_put_iova(bo, aspace);
msm_gem_unpin_iova(bo, aspace);
if (locked)
drm_gem_object_put(bo);