[PATCH v2 xf86-video-amdgpu 3/4] Defer vblank event handling while waiting for a pending flip
Michel Dänzer
michel at daenzer.net
Fri Aug 3 16:19:14 UTC 2018
From: Michel Dänzer <michel.daenzer at amd.com>
This is to avoid submitting more flips while we are waiting for pending
ones to complete.
Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
v2:
* Rebased on top of new patch 2.5
src/amdgpu_drm_queue.c | 41 +++++++++++++++++++++++++++++++++++++++--
src/amdgpu_drm_queue.h | 1 +
src/drmmode_display.c | 18 ++++++++++++------
src/drmmode_display.h | 4 ++++
4 files changed, 56 insertions(+), 8 deletions(-)
diff --git a/src/amdgpu_drm_queue.c b/src/amdgpu_drm_queue.c
index f8660828c..b13d28014 100644
--- a/src/amdgpu_drm_queue.c
+++ b/src/amdgpu_drm_queue.c
@@ -117,6 +117,30 @@ amdgpu_drm_vblank_handler(int fd, unsigned int frame, unsigned int sec,
user_ptr);
}
+/*
+ * Handle deferred DRM vblank events
+ *
+ * This function must be called after amdgpu_drm_wait_pending_flip, once
+ * it's safe to attempt queueing a flip again
+ */
+void
+amdgpu_drm_queue_handle_deferred(xf86CrtcPtr crtc)
+{
+ drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
+ struct amdgpu_drm_queue_entry *e, *tmp;
+
+ if (drmmode_crtc->wait_flip_nesting_level == 0 ||
+ --drmmode_crtc->wait_flip_nesting_level > 0)
+ return;
+
+ xorg_list_for_each_entry_safe(e, tmp, &amdgpu_drm_vblank_signalled, list) {
+ drmmode_crtc_private_ptr drmmode_crtc = e->crtc->driver_private;
+
+ if (drmmode_crtc->wait_flip_nesting_level == 0)
+ amdgpu_drm_queue_handle_one(e);
+ }
+}
+
/*
* Enqueue a potential drm response; when the associated response
* appears, we've got data to pass to the handler from here
@@ -191,6 +215,13 @@ amdgpu_drm_abort_entry(uintptr_t seq)
if (seq == AMDGPU_DRM_QUEUE_ERROR)
return;
+ xorg_list_for_each_entry_safe(e, tmp, &amdgpu_drm_vblank_signalled, list) {
+ if (e->seq == seq) {
+ amdgpu_drm_abort_one(e);
+ return;
+ }
+ }
+
xorg_list_for_each_entry_safe(e, tmp, &amdgpu_drm_queue, list) {
if (e->seq == seq) {
amdgpu_drm_abort_one(e);
@@ -229,8 +260,12 @@ amdgpu_drm_handle_event(int fd, drmEventContext *event_context)
xorg_list_for_each_entry_safe(e, tmp, &amdgpu_drm_flip_signalled, list)
amdgpu_drm_queue_handle_one(e);
- xorg_list_for_each_entry_safe(e, tmp, &amdgpu_drm_vblank_signalled, list)
- amdgpu_drm_queue_handle_one(e);
+ xorg_list_for_each_entry_safe(e, tmp, &amdgpu_drm_vblank_signalled, list) {
+ drmmode_crtc_private_ptr drmmode_crtc = e->crtc->driver_private;
+
+ if (drmmode_crtc->wait_flip_nesting_level == 0)
+ amdgpu_drm_queue_handle_one(e);
+ }
return r;
}
@@ -244,6 +279,8 @@ void amdgpu_drm_wait_pending_flip(xf86CrtcPtr crtc)
AMDGPUEntPtr pAMDGPUEnt = AMDGPUEntPriv(crtc->scrn);
struct amdgpu_drm_queue_entry *e, *tmp;
+ drmmode_crtc->wait_flip_nesting_level++;
+
xorg_list_for_each_entry_safe(e, tmp, &amdgpu_drm_flip_signalled, list)
amdgpu_drm_queue_handle_one(e);
diff --git a/src/amdgpu_drm_queue.h b/src/amdgpu_drm_queue.h
index 48ba9ab6e..4e7c8f4c4 100644
--- a/src/amdgpu_drm_queue.h
+++ b/src/amdgpu_drm_queue.h
@@ -42,6 +42,7 @@ typedef void (*amdgpu_drm_handler_proc)(xf86CrtcPtr crtc, uint32_t seq,
uint64_t usec, void *data);
typedef void (*amdgpu_drm_abort_proc)(xf86CrtcPtr crtc, void *data);
+void amdgpu_drm_queue_handle_deferred(xf86CrtcPtr crtc);
uintptr_t amdgpu_drm_queue_alloc(xf86CrtcPtr crtc, ClientPtr client,
uint64_t id, void *data,
amdgpu_drm_handler_proc handler,
diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 167b30091..9919c0923 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -305,6 +305,9 @@ drmmode_do_crtc_dpms(xf86CrtcPtr crtc, int mode)
nominal_frame_rate /= pix_in_frame;
drmmode_crtc->dpms_last_fps = nominal_frame_rate;
}
+
+ drmmode_crtc->dpms_mode = mode;
+ amdgpu_drm_queue_handle_deferred(crtc);
} else if (drmmode_crtc->dpms_mode != DPMSModeOn && mode == DPMSModeOn) {
/*
* Off->On transition: calculate and accumulate the
@@ -322,8 +325,9 @@ drmmode_do_crtc_dpms(xf86CrtcPtr crtc, int mode)
drmmode_crtc->interpolated_vblanks += delta_seq;
}
+
+ drmmode_crtc->dpms_mode = DPMSModeOn;
}
- drmmode_crtc->dpms_mode = mode;
}
static void
@@ -1415,6 +1419,7 @@ done:
}
}
+ amdgpu_drm_queue_handle_deferred(crtc);
return ret;
}
@@ -2320,11 +2325,6 @@ drmmode_output_set_tear_free(AMDGPUEntPtr pAMDGPUEnt,
drmmode_output->tear_free = tear_free;
if (crtc) {
- /* Wait for pending flips before drmmode_set_mode_major calls
- * drmmode_crtc_update_tear_free, to prevent a nested
- * drmHandleEvent call, which would hang
- */
- amdgpu_drm_wait_pending_flip(crtc);
drmmode_set_mode_major(crtc, &crtc->mode, crtc->rotation,
crtc->x, crtc->y);
}
@@ -3864,6 +3864,7 @@ Bool amdgpu_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
drmmode_crtc_private_ptr drmmode_crtc = config->crtc[0]->driver_private;
uint32_t flip_flags = flip_sync == FLIP_ASYNC ? DRM_MODE_PAGE_FLIP_ASYNC : 0;
drmmode_flipdata_ptr flipdata;
+ Bool handle_deferred = FALSE;
uintptr_t drm_queue_seq = 0;
struct drmmode_fb *fb;
int i = 0;
@@ -3946,6 +3947,7 @@ Bool amdgpu_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
if (drmmode_crtc->scanout_update_pending) {
amdgpu_drm_wait_pending_flip(crtc);
+ handle_deferred = TRUE;
amdgpu_drm_abort_entry(drmmode_crtc->scanout_update_pending);
drmmode_crtc->scanout_update_pending = 0;
}
@@ -3981,6 +3983,8 @@ Bool amdgpu_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
drm_queue_seq = 0;
}
+ if (handle_deferred)
+ amdgpu_drm_queue_handle_deferred(ref_crtc);
if (flipdata->flip_count > 0)
return TRUE;
@@ -4000,5 +4004,7 @@ error:
xf86DrvMsg(scrn->scrnIndex, X_WARNING, "Page flip failed: %s\n",
strerror(errno));
+ if (handle_deferred)
+ amdgpu_drm_queue_handle_deferred(ref_crtc);
return FALSE;
}
diff --git a/src/drmmode_display.h b/src/drmmode_display.h
index 5618c6b40..27610d537 100644
--- a/src/drmmode_display.h
+++ b/src/drmmode_display.h
@@ -119,6 +119,10 @@ typedef struct {
/* Modeset needed for DPMS on */
Bool need_modeset;
+ /* For keeping track of nested calls to drm_wait_pending_flip /
+ * drm_queue_handle_deferred
+ */
+ int wait_flip_nesting_level;
/* A flip to this FB is pending for this CRTC */
struct drmmode_fb *flip_pending;
/* The FB currently being scanned out by this CRTC, if any */
--
2.18.0
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