This is something that got noticed a while ago back when I was fixing a large number of runtime PM related issues in nouveau, but never got fixed:
https://patchwork.freedesktop.org/series/46815/#rev7
It's not safe to iterate the entire list of CRTCs in nv50_disp_atomic_commit(), as we could be doing a non-blocking modeset on one CRTC in parallel with one or more other CRTCs. Likewise, this means it's also not safe to do so in order to track runtime PM state. While this code is certainly wrong, so far the only issues I've seen this cause in the wild is the occasional PM ref unbalance after an atomic check failure + module reloading (since the PCI device will outlive nouveau in such scenarios).
So, do this far more elegantly: grab a runtime PM ref across the modeset and commit tail, then grab/put references for each CRTC enable/disable. This also ends up being much simpler then the previous broken solution we had.
Finally, since we've removed all it's users: get rid of nouveau_drm->have_disp_power_ref.
Signed-off-by: Lyude Paul lyude@redhat.com --- drivers/gpu/drm/nouveau/dispnv50/disp.c | 38 +++++++++++-------------- drivers/gpu/drm/nouveau/nouveau_drv.h | 3 -- 2 files changed, 17 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c index 126703816794..659e6fa645cb 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -1826,8 +1826,11 @@ nv50_disp_atomic_commit_tail(struct drm_atomic_state *state)
NV_ATOMIC(drm, "%s: clr %04x (set %04x)\n", crtc->name, asyh->clr.mask, asyh->set.mask); - if (old_crtc_state->active && !new_crtc_state->active) + + if (old_crtc_state->active && !new_crtc_state->active) { + pm_runtime_put_noidle(dev->dev); drm_crtc_vblank_off(crtc); + }
if (asyh->clr.mask) { nv50_head_flush_clr(head, asyh, atom->flush_disable); @@ -1913,8 +1916,10 @@ nv50_disp_atomic_commit_tail(struct drm_atomic_state *state) }
if (new_crtc_state->active) { - if (!old_crtc_state->active) + if (!old_crtc_state->active) { drm_crtc_vblank_on(crtc); + pm_runtime_get_noresume(dev->dev); + } if (new_crtc_state->event) drm_crtc_vblank_get(crtc); } @@ -1979,6 +1984,10 @@ nv50_disp_atomic_commit_tail(struct drm_atomic_state *state) drm_atomic_helper_cleanup_planes(dev, state); drm_atomic_helper_commit_cleanup_done(state); drm_atomic_state_put(state); + + /* Drop the RPM ref we got from nv50_disp_atomic_commit() */ + pm_runtime_mark_last_busy(dev->dev); + pm_runtime_put_autosuspend(dev->dev); }
static void @@ -1993,11 +2002,8 @@ static int nv50_disp_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state, bool nonblock) { - struct nouveau_drm *drm = nouveau_drm(dev); struct drm_plane_state *new_plane_state; struct drm_plane *plane; - struct drm_crtc *crtc; - bool active = false; int ret, i;
ret = pm_runtime_get_sync(dev->dev); @@ -2034,27 +2040,17 @@ nv50_disp_atomic_commit(struct drm_device *dev,
drm_atomic_state_get(state);
+ /* + * Grab another RPM ref for the commit tail, which will release the + * ref when it's finished + */ + pm_runtime_get_noresume(dev->dev); + if (nonblock) queue_work(system_unbound_wq, &state->commit_work); else nv50_disp_atomic_commit_tail(state);
- drm_for_each_crtc(crtc, dev) { - if (crtc->state->active) { - if (!drm->have_disp_power_ref) { - drm->have_disp_power_ref = true; - return 0; - } - active = true; - break; - } - } - - if (!active && drm->have_disp_power_ref) { - pm_runtime_put_autosuspend(dev->dev); - drm->have_disp_power_ref = false; - } - err_cleanup: if (ret) drm_atomic_helper_cleanup_planes(dev, state); diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h index aae035816383..411352dd5390 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drv.h +++ b/drivers/gpu/drm/nouveau/nouveau_drv.h @@ -204,9 +204,6 @@ struct nouveau_drm { /* led management */ struct nouveau_led *led;
- /* display power reference */ - bool have_disp_power_ref; - struct dev_pm_domain vga_pm_domain;
struct nouveau_svm *svm;