From 37c98ae7785bedbea04266880dc2e24fe2403a7c Mon Sep 17 00:00:00 2001 From: Ao Xu Date: Mon, 29 Jul 2019 16:35:36 +0800 Subject: [PATCH] drm: Pass CRTC ID in userspace vblank events PD#SWPL-4863 With the atomic API, it is possible that a single commit affects multiple crtcs. If the user requests an event with that commit, one event will be sent for each CRTC, but it is not possible to distinguish which crtc an event is for in user space. To solve this, the reserved field in struct drm_vblank_event is repurposed to include the crtc_id which the event is for. The DRM_CAP_CRTC_IN_VBLANK_EVENT is added to allow userspace to query if the crtc field will be set properly. [daniels: Rebased, using Maarten's forward-port.] Signed-off-by: Ander Conselvan de Oliveira Signed-off-by: Daniel Stone Cc: Maarten Lankhorst Link: http://patchwork.freedesktop.org/patch/msgid/20170404165221.28240-2-daniels@collabora.com Change-Id: Ide7657bdc38563d2de91edc2d649b53262002c39 Signed-off-by: Ao Xu --- drivers/gpu/drm/drm_ioctl.c | 3 +++ drivers/gpu/drm/drm_irq.c | 2 ++ include/uapi/drm/drm.h | 3 ++- 3 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c index 71c3473476c7..649ff759cbfd 100644 --- a/drivers/gpu/drm/drm_ioctl.c +++ b/drivers/gpu/drm/drm_ioctl.c @@ -277,6 +277,9 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_ case DRM_CAP_ADDFB2_MODIFIERS: req->value = dev->mode_config.allow_fb_modifiers; break; + case DRM_CAP_CRTC_IN_VBLANK_EVENT: + req->value = 1; + break; default: return -EINVAL; } diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 00c815a7c414..28536aa0a875 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -1048,6 +1048,7 @@ void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, e->pipe = pipe; e->event.sequence = drm_vblank_count(dev, pipe); + e->event.crtc_id = crtc->base.id; list_add_tail(&e->base.link, &dev->vblank_event_list); } EXPORT_SYMBOL(drm_crtc_arm_vblank_event); @@ -1078,6 +1079,7 @@ void drm_crtc_send_vblank_event(struct drm_crtc *crtc, now = get_drm_timestamp(); } e->pipe = pipe; + e->event.crtc_id = crtc->base.id; send_vblank_event(dev, e, seq, &now); } EXPORT_SYMBOL(drm_crtc_send_vblank_event); diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h index b2c52843bc70..42d9f64ce416 100644 --- a/include/uapi/drm/drm.h +++ b/include/uapi/drm/drm.h @@ -647,6 +647,7 @@ struct drm_gem_open { #define DRM_CAP_CURSOR_HEIGHT 0x9 #define DRM_CAP_ADDFB2_MODIFIERS 0x10 #define DRM_CAP_PAGE_FLIP_TARGET 0x11 +#define DRM_CAP_CRTC_IN_VBLANK_EVENT 0x12 /** DRM_IOCTL_GET_CAP ioctl argument type */ struct drm_get_cap { @@ -851,7 +852,7 @@ struct drm_event_vblank { __u32 tv_sec; __u32 tv_usec; __u32 sequence; - __u32 reserved; + __u32 crtc_id; /* 0 on older kernels that do not support this */ }; /* typedef area */