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@xxxxxxxxxxxxxxxxxxxxx>
---
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)
{
--
2.4.9
--
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