[PATCH] amdgpu/dc: Use DRM new-style object iterators.
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Thu Oct 12 06:00:24 UTC 2017
Op 11-10-17 om 22:40 schreef Harry Wentland:
> On 2017-10-11 03:46 PM, Maarten Lankhorst wrote:
>> Op 11-10-17 om 20:55 schreef Leo:
>>>
>>> On 2017-10-11 10:30 AM, Maarten Lankhorst wrote:
>>>> Op 11-10-17 om 16:24 schreef sunpeng.li at amd.com:
>>>>> From: "Leo (Sunpeng) Li" <sunpeng.li at amd.com>
>>>>>
>>>>> Use the correct for_each_new/old_* iterators instead of for_each_*
>>>>>
>>>>> List of affected functions:
>>>>>
>>>>> amdgpu_dm_find_first_crtc_matching_connector: use for_each_new
>>>>> - Old from_state_var flag was always choosing the new state
>>>>>
>>>>> amdgpu_dm_display_resume: use for_each_new
>>>>> - drm_atomic_helper_duplicate_state is called during suspend to
>>>>> cache the state
>>>>> - It sets 'state' within the state triplet to 'new_state'
>>>>>
>>>>> amdgpu_dm_commit_planes: use for_each_old
>>>>> - Called after the state was swapped (via atomic commit tail)
>>>>>
>>>>> amdgpu_dm_atomic_commit: use for_each_new
>>>>> - Called before the state is swapped
>>>>>
>>>>> amdgpu_dm_atomic_commit_tail: use for_each_old
>>>>> - Called after the state was swapped
>>>>>
>>>>> dm_update_crtcs_state: use for_each_new
>>>>> - Called before the state is swapped (via atomic check)
>>>>>
>>>>> amdgpu_dm_atomic_check: use for_each_new
>>>>> - Called before the state is swapped
>>>>>
>>>>> Also fix some typos.
>>>>>
>>>>> crct -> crtc
>>>>> undersacn -> underscan
>>>>>
>>>>> Signed-off-by: Leo (Sunpeng) Li <sunpeng.li at amd.com>
>>>>> ---
>>>>>
>>>>> Hi Dave,
>>>>>
>>>>> This patch goes on top of your fixup for new api's patch. Please feel
>>>>> free to squash them.
>>>>>
>>>>> Thanks,
>>>>> Leo
>>>>>
>>>>> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 38 +++++++++--------------
>>>>> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 5 ++-
>>>>> 2 files changed, 16 insertions(+), 27 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>>>> index 9bfe1f9..9394558 100644
>>>>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>>>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>>>> @@ -568,25 +568,17 @@ static int dm_suspend(void *handle)
>>>>> return ret;
>>>>> }
>>>>> -struct amdgpu_dm_connector *amdgpu_dm_find_first_crct_matching_connector(
>>>>> +struct amdgpu_dm_connector *amdgpu_dm_find_first_crtc_matching_connector(
>>>>> struct drm_atomic_state *state,
>>>>> - struct drm_crtc *crtc,
>>>>> - bool from_state_var)
>>>>> + struct drm_crtc *crtc)
>>>>> {
>>>>> uint32_t i;
>>>>> struct drm_connector_state *conn_state;
>>>>> struct drm_connector *connector;
>>>>> struct drm_crtc *crtc_from_state;
>>>>> - for_each_new_connector_in_state(
>>>>> - state,
>>>>> - connector,
>>>>> - conn_state,
>>>>> - i) {
>>>>> - crtc_from_state =
>>>>> - from_state_var ?
>>>>> - conn_state->crtc :
>>>>> - connector->state->crtc;
>>>>> + for_each_new_connector_in_state(state, connector, conn_state, i) {
>>>>> + crtc_from_state = conn_state->crtc;
>>>> Please assign crtc_from_state here with drm_atomic_get_(new/old)_crtc_state.
>>> We're trying to fetch a drm_crtc from a drm_connector_state, I don't think the state getters are applicable here.
>>>
>>> Also, the function should really be named 'find_first_connector_matching_crtc'. I'll fix that.
>> Oh I misunderstood. But in general derefencing $obj->state should be frowned upon. If you ever want to support atomic flip depth > 1,
>> all those references should be gone from your driver, and replaced with get_old/new_state..
> If I understand correctly this is the forward-looking way of how we get the
> state now? I still see plenty of $obj->state in i915 and other drivers.
>
> Any objections to doing this as a follow-up patch?
>
> What's atomic flip depth > 1?
That we allow multiple uncompleted nonblocking atomic commits to the same crtc,
which requires that during commit, $obj->state is not the same as
new_$obj_state any more. It can be set to an even newer state, but the current
commit has to set the state that is in state->$obj[i].new_state. This can be
obtained with either the iterators, or drm_atomic_get_new_$obj_state.
This is why we we got rid of the old iterators, get_existing_state and $obj->state
were no longer sufficient for this.
Using drm_atomic_get_old/new_obj_state should be a separate patch, but can be fixed
opportunistically.
But something like
for_each_old_crtc_in_state(...) {
new_crtc_state = crtc->state
....
}
should definitely be fixed in this patch. It's what the iterators are for. :)
I know i915 is still dereferencing $obj->state, but we're trying to slowly fix these
when we come across them. This usually involves passing the correct state object up
the callchain, which can be quite deep.
Cheers,
Maarten
> Harry
>
>>>>
>>>>> if (crtc_from_state == crtc)
>>>>> return to_amdgpu_dm_connector(connector);
>>>>> @@ -3890,7 +3882,7 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
>>>>> unsigned long flags;
>>>>> /* update planes when needed */
>>>>> - for_each_new_plane_in_state(state, plane, old_plane_state, i) {
>>>>> + for_each_old_plane_in_state(state, plane, old_plane_state, i) {
>>>>> struct drm_plane_state *plane_state = plane->state;
>>>>> struct drm_crtc *crtc = plane_state->crtc;
>>>>> struct drm_framebuffer *fb = plane_state->fb;
>>>> Use for_each_oldnew_*_in_state
>>>>> @@ -4024,7 +4016,7 @@ void amdgpu_dm_atomic_commit_tail(
>>>>> dm_state = to_dm_atomic_state(state);
>>>>> /* update changed items */
>>>>> - for_each_new_crtc_in_state(state, crtc, old_crtc_state, i) {
>>>>> + for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) {
>>>>> struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);
>>>>> struct drm_crtc_state *new_state = crtc->state;
>>>> Same.
>>> Good points, it seems like there's quite a few places where drm interfaces can be used. Thanks for pointing this out.
>>>
>>> Leo
>>>
>>>>> @@ -4113,11 +4105,9 @@ void amdgpu_dm_atomic_commit_tail(
>>>>> new_acrtc_state = to_dm_crtc_state(new_crtcs[i]->base.state);
>>>>> new_stream = new_acrtc_state->stream;
>>>>> - aconnector =
>>>>> - amdgpu_dm_find_first_crct_matching_connector(
>>>>> + aconnector = amdgpu_dm_find_first_crtc_matching_connector(
>>>>> state,
>>>>> - &new_crtcs[i]->base,
>>>>> - false);
>>>>> + &new_crtcs[i]->base);
>>>>> if (!aconnector) {
>>>>> DRM_DEBUG_DRIVER("Atomic commit: Failed to find connector for acrtc id:%d "
>>>>> "skipping freesync init\n",
>>>>> @@ -4150,8 +4140,8 @@ void amdgpu_dm_atomic_commit_tail(
>>>>> }
>>>>> }
>>>>> - /* Handle scaling and undersacn changes*/
>>>>> - for_each_new_connector_in_state(state, connector, old_conn_state, i) {
>>>>> + /* Handle scaling and underscan changes*/
>>>>> + for_each_old_connector_in_state(state, connector, old_conn_state, i) {
>>>>> struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
>>>>> struct dm_connector_state *con_new_state =
>>>>> to_dm_connector_state(aconnector->base.state);
>>>> Same here..
>>>>> @@ -4205,7 +4195,7 @@ void amdgpu_dm_atomic_commit_tail(
>>>>> }
>>>>> /* update planes when needed per crtc*/
>>>>> - for_each_new_crtc_in_state(state, pcrtc, old_crtc_state, j) {
>>>>> + for_each_old_crtc_in_state(state, pcrtc, old_crtc_state, j) {
>>>>> new_acrtc_state = to_dm_crtc_state(pcrtc->state);
>>>> Same.
>>>>> if (new_acrtc_state->stream)
>>>>> @@ -4218,7 +4208,7 @@ void amdgpu_dm_atomic_commit_tail(
>>>>> * mark consumed event for drm_atomic_helper_commit_hw_done
>>>>> */
>>>>> spin_lock_irqsave(&adev->ddev->event_lock, flags);
>>>>> - for_each_new_crtc_in_state(state, crtc, old_crtc_state, i) {
>>>>> + for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) {
>>>>> struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);
>>>>> if (acrtc->base.state->event)
>>>> Same. You're dereferencing crtc->state
>>>>> @@ -4402,7 +4392,7 @@ static int dm_update_crtcs_state(
>>>>> new_acrtc_state = to_dm_crtc_state(crtc_state);
>>>>> acrtc = to_amdgpu_crtc(crtc);
>>>>> - aconnector = amdgpu_dm_find_first_crct_matching_connector(state, crtc, true);
>>>>> + aconnector = amdgpu_dm_find_first_crtc_matching_connector(state, crtc);
>>>>> /* TODO This hack should go away */
>>>>> if (aconnector) {
>>>>> @@ -4715,7 +4705,7 @@ int amdgpu_dm_atomic_check(struct drm_device *dev,
>>>>> if (ret)
>>>>> goto fail;
>>>>> - /* Check scaling and undersacn changes*/
>>>>> + /* Check scaling and underscan changes*/
>>>>> /*TODO Removed scaling changes validation due to inability to commit
>>>>> * new stream into context w\o causing full reset. Need to
>>>>> * decide how to handle.
>>>>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
>>>>> index 630e6cd..c1b77bd 100644
>>>>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
>>>>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
>>>>> @@ -226,10 +226,9 @@ extern const struct amdgpu_ip_block_version dm_ip_block;
>>>>> void amdgpu_dm_update_connector_after_detect(
>>>>> struct amdgpu_dm_connector *aconnector);
>>>>> -struct amdgpu_dm_connector *amdgpu_dm_find_first_crct_matching_connector(
>>>>> +struct amdgpu_dm_connector *amdgpu_dm_find_first_crtc_matching_connector(
>>>>> struct drm_atomic_state *state,
>>>>> - struct drm_crtc *crtc,
>>>>> - bool from_state_var);
>>>>> + struct drm_crtc *crtc);
>>>>> struct amdgpu_framebuffer;
>>>>
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