Re: [Xen-devel] [PATCH 06/34] drm/i915: convert put_page() to put_user_page*()
On 8/2/19 11:48 AM, John Hubbard wrote:
> On 8/2/19 2:19 AM, Joonas Lahtinen wrote:
>> Quoting john.hubb...@gmail.com (2019-08-02 05:19:37)
>>> From: John Hubbard
...
> In order to deal with the merge problem, I'll drop this patch from my series,
> and I'd recommend that the drm-intel-next take the following approach:
Actually, I just pulled the latest linux.git, and there are a few changes:
>
> 1) For now, s/put_page/put_user_page/ in i915_gem_userptr_put_pages(),
> and fix up the set_page_dirty() --> set_page_dirty_lock() issue, like this
> (based against linux.git):
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
> b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
> index 528b61678334..94721cc0093b 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
> @@ -664,10 +664,10 @@ i915_gem_userptr_put_pages(struct drm_i915_gem_object
> *obj,
>
> for_each_sgt_page(page, sgt_iter, pages) {
> if (obj->mm.dirty)
> - set_page_dirty(page);
> + set_page_dirty_lock(page);
I see you've already applied this fix to your tree, in linux.git already.
>
> mark_page_accessed(page);
> - put_page(page);
> + put_user_page(page);
But this conversion still needs doing. So I'll repost a patch that only does
this (plus the other call sites).
That can go in via either your tree, or Andrew's -mm tree, without generating
any conflicts.
thanks,
--
John Hubbard
NVIDIA
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Re: [Xen-devel] [PATCH 06/34] drm/i915: convert put_page() to put_user_page*()
On 8/2/19 2:19 AM, Joonas Lahtinen wrote:
Quoting john.hubb...@gmail.com (2019-08-02 05:19:37)
From: John Hubbard
For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().
This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").
Note that this effectively changes the code's behavior in
i915_gem_userptr_put_pages(): it now calls set_page_dirty_lock(),
instead of set_page_dirty(). This is probably more accurate.
We've already fixed this in drm-tip where the current code uses
set_page_dirty_lock().
This would conflict with our tree. Rodrigo is handling
drm-intel-next for 5.4, so you guys want to coordinate how
to merge.
Hi Joonas, Rodrigo,
First of all, I apologize for the API breakage: put_user_pages_dirty_lock()
has an additional "dirty" parameter.
In order to deal with the merge problem, I'll drop this patch from my series,
and I'd recommend that the drm-intel-next take the following approach:
1) For now, s/put_page/put_user_page/ in i915_gem_userptr_put_pages(),
and fix up the set_page_dirty() --> set_page_dirty_lock() issue, like this
(based against linux.git):
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index 528b61678334..94721cc0093b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -664,10 +664,10 @@ i915_gem_userptr_put_pages(struct drm_i915_gem_object
*obj,
for_each_sgt_page(page, sgt_iter, pages) {
if (obj->mm.dirty)
- set_page_dirty(page);
+ set_page_dirty_lock(page);
mark_page_accessed(page);
- put_page(page);
+ put_user_page(page);
}
obj->mm.dirty = false;
That will leave you with your original set_page_dirty_lock() calls
and everything works properly.
2) Next cycle, move to the new put_user_pages_dirty_lock().
thanks,
--
John Hubbard
NVIDIA
Regards, Joonas
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Re: [Xen-devel] [PATCH 06/34] drm/i915: convert put_page() to put_user_page*()
Quoting john.hubb...@gmail.com (2019-08-02 05:19:37)
> From: John Hubbard
>
> For pages that were retained via get_user_pages*(), release those pages
> via the new put_user_page*() routines, instead of via put_page() or
> release_pages().
>
> This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
> ("mm: introduce put_user_page*(), placeholder versions").
>
> Note that this effectively changes the code's behavior in
> i915_gem_userptr_put_pages(): it now calls set_page_dirty_lock(),
> instead of set_page_dirty(). This is probably more accurate.
We've already fixed this in drm-tip where the current code uses
set_page_dirty_lock().
This would conflict with our tree. Rodrigo is handling
drm-intel-next for 5.4, so you guys want to coordinate how
to merge.
Regards, Joonas
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[Xen-devel] [PATCH 06/34] drm/i915: convert put_page() to put_user_page*()
From: John Hubbard
For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().
This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").
Note that this effectively changes the code's behavior in
i915_gem_userptr_put_pages(): it now calls set_page_dirty_lock(),
instead of set_page_dirty(). This is probably more accurate.
As Christophe Hellwig put it, "set_page_dirty() is only safe if we are
dealing with a file backed page where we have reference on the inode it
hangs off." [1]
[1] https://lore.kernel.org/r/20190723153640.gb...@lst.de
Cc: Jani Nikula
Cc: Joonas Lahtinen
Cc: Rodrigo Vivi
Cc: David Airlie
Cc: intel-...@lists.freedesktop.org
Cc: dri-de...@lists.freedesktop.org
Signed-off-by: John Hubbard
---
drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 9 +++--
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index 528b61678334..c18008d3cc2a 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -527,7 +527,7 @@ __i915_gem_userptr_get_pages_worker(struct work_struct
*_work)
}
mutex_unlock(>mm.lock);
- release_pages(pvec, pinned);
+ put_user_pages(pvec, pinned);
kvfree(pvec);
i915_gem_object_put(obj);
@@ -640,7 +640,7 @@ static int i915_gem_userptr_get_pages(struct
drm_i915_gem_object *obj)
__i915_gem_userptr_set_active(obj, true);
if (IS_ERR(pages))
- release_pages(pvec, pinned);
+ put_user_pages(pvec, pinned);
kvfree(pvec);
return PTR_ERR_OR_ZERO(pages);
@@ -663,11 +663,8 @@ i915_gem_userptr_put_pages(struct drm_i915_gem_object *obj,
i915_gem_gtt_finish_pages(obj, pages);
for_each_sgt_page(page, sgt_iter, pages) {
- if (obj->mm.dirty)
- set_page_dirty(page);
-
mark_page_accessed(page);
- put_page(page);
+ put_user_pages_dirty_lock(, 1, obj->mm.dirty);
}
obj->mm.dirty = false;
--
2.22.0
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