Basically this is an extended version of drmHandleEvent().
drmHandleEvent() only handles core events (like e.g. page flips), but since kernel DRM drivers might use vendor-specific events to signal userspace the completion of pending jobs, etc., its desirable to provide a way to handle these without putting vendor-specific code in the core libdrm.
To use this you provide drmHandleEvent2() with a function that handles your non-core events.
The signature of that function looks like this: void vendor(int fd, struct drm_event *e, void *ctx);
'fd' is the DRM file descriptor, 'e' the non-core event and 'ctx' the event context (casted to void).
This way we don't have to maintain a copy of drmHandleEvent() in the vendor code.
v2: Remove the opaque pointer, since this can be better handled with a container approach.
Signed-off-by: Tobias Jakobi tjakobi@math.uni-bielefeld.de --- xf86drm.h | 21 +++++++++++++++++++++ xf86drmMode.c | 10 +++++++++- 2 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/xf86drm.h b/xf86drm.h index 481d882..1e474a3 100644 --- a/xf86drm.h +++ b/xf86drm.h @@ -750,8 +750,29 @@ typedef struct _drmEventContext {
} drmEventContext, *drmEventContextPtr;
+typedef void (*drmEventVendorHandler)(int fd, struct drm_event *e, void *ctx); + extern int drmHandleEvent(int fd, drmEventContextPtr evctx);
+/* + * drmHandleEvent2() is an extended variant of drmHandleEvent() which + * allows handling of vendor-specific/non-core events. + * The function pointer 'vendorhandler' is used (if non-zero) to + * process non-core events. Users of have to prepare a container struct + * in the following way: + * + * struct vendor_event_context { + * drmEventContext base; + * int vendor_specific_data[num]; + * }; + * + * And then call: + * struct vendor_event_context ctx = {0}; + * drmHandleEvent2(fd, &ctx.base, handler); + */ +extern int drmHandleEvent2(int fd, drmEventContextPtr evctx, + drmEventVendorHandler vendorhandler); + extern char *drmGetDeviceNameFromFd(int fd); extern int drmGetNodeTypeFromFd(int fd);
diff --git a/xf86drmMode.c b/xf86drmMode.c index ab6b519..89698da 100644 --- a/xf86drmMode.c +++ b/xf86drmMode.c @@ -867,7 +867,8 @@ int drmModeCrtcSetGamma(int fd, uint32_t crtc_id, uint32_t size, return DRM_IOCTL(fd, DRM_IOCTL_MODE_SETGAMMA, &l); }
-int drmHandleEvent(int fd, drmEventContextPtr evctx) +int drmHandleEvent2(int fd, drmEventContextPtr evctx, + drmEventVendorHandler vendorhandler) { char buffer[1024]; int len, i; @@ -910,6 +911,8 @@ int drmHandleEvent(int fd, drmEventContextPtr evctx) U642VOID (vblank->user_data)); break; default: + if (vendorhandler) + vendorhandler(fd, e, evctx); break; } i += e->length; @@ -918,6 +921,11 @@ int drmHandleEvent(int fd, drmEventContextPtr evctx) return 0; }
+int drmHandleEvent(int fd, drmEventContextPtr evctx) +{ + return drmHandleEvent2(fd, evctx, NULL); +} + int drmModePageFlip(int fd, uint32_t crtc_id, uint32_t fb_id, uint32_t flags, void *user_data) {