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Store FB for each CRTC in drmmode_flipdata_rec

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We were only storing the FB provided by the client, but on CRTCs with
TearFree enabled, we use a separate FB. This could cause
drmmode_flip_handler to fail to clear drmmode_crtc->flip_pending, which
could result in a hang when waiting for the pending flip to complete. We
were trying to avoid that by always clearing drmmode_crtc->flip_pending
when TearFree is enabled, but that wasn't reliable, because
drmmode_crtc->tear_free can already be FALSE at this point when
disabling TearFree.

Now that we're keeping track of each CRTC's flip FB separately,
drmmode_flip_handler can reliably clear flip_pending, and we no longer
need the TearFree hack.

(Ported from amdgpu commit 9b6782c821e0bdc53336d98f87ddde752faf7902)
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michel Dänzer
2018-08-02 18:49:48 +02:00
committed by Michel Dänzer
parent ef2a6b818f
commit 740f0850f1
2 changed files with 27 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
src/drmmode_display.c
View File

@@ -2536,17 +2536,21 @@ drmmode_flip_abort(xf86CrtcPtr crtc, void *event_data)
drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
RADEONEntPtr pRADEONEnt = RADEONEntPriv(crtc->scrn);
drmmode_flipdata_ptr flipdata = event_data;
int crtc_id = drmmode_get_crtc_id(crtc);
struct drmmode_fb **fb = &flipdata->fb[crtc_id];
if (drmmode_crtc->flip_pending == *fb) {
drmmode_fb_reference(pRADEONEnt->fd, &drmmode_crtc->flip_pending,
NULL);
}
drmmode_fb_reference(pRADEONEnt->fd, fb, NULL);
if (--flipdata->flip_count == 0) {
if (!flipdata->fe_crtc)
flipdata->fe_crtc = crtc;
flipdata->abort(flipdata->fe_crtc, flipdata->event_data);
drmmode_fb_reference(pRADEONEnt->fd, &flipdata->fb, NULL);
free(flipdata);
}
drmmode_fb_reference(pRADEONEnt->fd, &drmmode_crtc->flip_pending,
NULL);
}
static void
@@ -2555,6 +2559,8 @@ drmmode_flip_handler(xf86CrtcPtr crtc, uint32_t frame, uint64_t usec, void *even
drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
RADEONEntPtr pRADEONEnt = RADEONEntPriv(crtc->scrn);
drmmode_flipdata_ptr flipdata = event_data;
int crtc_id = drmmode_get_crtc_id(crtc);
struct drmmode_fb **fb = &flipdata->fb[crtc_id];
/* Is this the event whose info shall be delivered to higher level? */
if (crtc == flipdata->fe_crtc) {
@@ -2563,13 +2569,12 @@ drmmode_flip_handler(xf86CrtcPtr crtc, uint32_t frame, uint64_t usec, void *even
flipdata->fe_usec = usec;
}
drmmode_fb_reference(pRADEONEnt->fd, &drmmode_crtc->fb,
flipdata->fb);
if (drmmode_crtc->tear_free ||
drmmode_crtc->flip_pending == flipdata->fb) {
if (drmmode_crtc->flip_pending == *fb) {
drmmode_fb_reference(pRADEONEnt->fd,
&drmmode_crtc->flip_pending, NULL);
}
drmmode_fb_reference(pRADEONEnt->fd, &drmmode_crtc->fb, *fb);
drmmode_fb_reference(pRADEONEnt->fd, fb, NULL);
if (--flipdata->flip_count == 0) {
/* Deliver MSC & UST from reference/current CRTC to flip event
@@ -2581,7 +2586,6 @@ drmmode_flip_handler(xf86CrtcPtr crtc, uint32_t frame, uint64_t usec, void *even
else
flipdata->handler(crtc, frame, usec, flipdata->event_data);
drmmode_fb_reference(pRADEONEnt->fd, &flipdata->fb, NULL);
free(flipdata);
}
}
@@ -3287,21 +3291,22 @@ Bool radeon_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
xf86CrtcPtr crtc = NULL;
drmmode_crtc_private_ptr drmmode_crtc = config->crtc[0]->driver_private;
int i;
uint32_t flip_flags = flip_sync == FLIP_ASYNC ? DRM_MODE_PAGE_FLIP_ASYNC : 0;
drmmode_flipdata_ptr flipdata;
uintptr_t drm_queue_seq = 0;
struct drmmode_fb *fb;
int i = 0;
flipdata = calloc(1, sizeof(drmmode_flipdata_rec));
flipdata = calloc(1, sizeof(*flipdata) + config->num_crtc *
sizeof(flipdata->fb[0]));
if (!flipdata) {
xf86DrvMsg(scrn->scrnIndex, X_WARNING,
"flip queue: data alloc failed.\n");
goto error;
}
drmmode_fb_reference(pRADEONEnt->fd, &flipdata->fb,
radeon_pixmap_get_fb(new_front));
if (!flipdata->fb) {
fb = radeon_pixmap_get_fb(new_front);
if (!fb) {
ErrorF("Failed to get FB for flip\n");
goto error;
}
@@ -3322,8 +3327,6 @@ Bool radeon_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
flipdata->fe_crtc = ref_crtc;
for (i = 0; i < config->num_crtc; i++) {
struct drmmode_fb *fb = flipdata->fb;
crtc = config->crtc[i];
drmmode_crtc = crtc->driver_private;
@@ -3359,8 +3362,9 @@ Bool radeon_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
goto next;
}
fb = radeon_pixmap_get_fb(drmmode_crtc->scanout[scanout_id].pixmap);
if (!fb) {
drmmode_fb_reference(pRADEONEnt->fd, &flipdata->fb[i],
radeon_pixmap_get_fb(drmmode_crtc->scanout[scanout_id].pixmap));
if (!flipdata->fb[i]) {
ErrorF("Failed to get FB for TearFree flip\n");
goto error;
}
@@ -3375,6 +3379,8 @@ Bool radeon_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
radeon_drm_abort_entry(drmmode_crtc->scanout_update_pending);
drmmode_crtc->scanout_update_pending = 0;
}
} else {
drmmode_fb_reference(pRADEONEnt->fd, &flipdata->fb[i], fb);
}
if (crtc == ref_crtc) {
@@ -3400,8 +3406,8 @@ Bool radeon_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
}
next:
drmmode_fb_reference(pRADEONEnt->fd,
&drmmode_crtc->flip_pending, fb);
drmmode_fb_reference(pRADEONEnt->fd, &drmmode_crtc->flip_pending,
flipdata->fb[i]);
drm_queue_seq = 0;
}
@@ -3419,7 +3425,6 @@ error:
drmmode_flip_abort(crtc, flipdata);
else {
abort(NULL, data);
drmmode_fb_reference(pRADEONEnt->fd, &flipdata->fb, NULL);
free(flipdata);
}

2
src/drmmode_display.h
View File

@@ -56,7 +56,6 @@ typedef struct {
} drmmode_rec, *drmmode_ptr;
typedef struct {
struct drmmode_fb *fb;
void *event_data;
int flip_count;
unsigned int fe_frame;
@@ -64,6 +63,7 @@ typedef struct {
xf86CrtcPtr fe_crtc;
radeon_drm_handler_proc handler;
radeon_drm_abort_proc abort;
struct drmmode_fb *fb[0];
} drmmode_flipdata_rec, *drmmode_flipdata_ptr;
struct drmmode_fb {