[PATCH 4/4] Add Present extension support

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Signed-off-by: Keith Packard <keithp@xxxxxxxxxx>
---
 configure.ac            |  15 ++
 src/uxa/Makefile.am     |   6 +
 src/uxa/intel.h         |  15 ++
 src/uxa/intel_driver.c  |   4 +
 src/uxa/intel_present.c | 406 ++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 446 insertions(+)
 create mode 100644 src/uxa/intel_present.c

diff --git a/configure.ac b/configure.ac
index 13b9970..8d881a8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -277,6 +277,7 @@ XORG_DRIVER_CHECK_EXT(RENDER, renderproto)
 XORG_DRIVER_CHECK_EXT(XF86DRI, xextproto x11)
 XORG_DRIVER_CHECK_EXT(DPMSExtension, xextproto)
 XORG_DRIVER_CHECK_EXT(DRI3, dri3proto)
+XORG_DRIVER_CHECK_EXT(PRESENT, presentproto)
 
 # Obtain compiler/linker options for the driver dependencies
 PKG_CHECK_MODULES(DRM, [libdrm >= 2.4.20]) # libdrm_intel is checked separately
@@ -477,6 +478,19 @@ AC_MSG_CHECKING([whether to include DRI3 support])
 AM_CONDITIONAL(DRI3, test "x$DRI3" = xyes)
 AC_MSG_RESULT([$DRI3])
 
+if test "x$PRESENT" != "xno"; then
+	save_CFLAGS=$CFLAGS
+	CFLAGS="$XORG_CFLAGS $PRESENT_CFLAGS"
+	AC_CHECK_DECL(PRESENT,
+		      [PRESENT=yes], [PRESENT=no],
+		      [#include <xorg-server.h>])
+	CFLAGS=$save_CFLAGS
+fi
+echo 'PRESENT is now ' $PRESENT
+AC_MSG_CHECKING([whether to include Present support])
+AM_CONDITIONAL(PRESENT, test "x$PRESENT" = xyes)
+AC_MSG_RESULT([$PRESENT])
+
 AC_CHECK_HEADERS([X11/extensions/dpmsconst.h])
 
 AC_MSG_CHECKING([whether to include UXA support])
@@ -731,6 +745,7 @@ echo "  Additional debugging support?$debug_msg"
 echo "  Support for Kernel Mode Setting? $KMS"
 echo "  Support for legacy User Mode Setting (for i810)? $UMS"
 echo "  Support for Direct Rendering Infrastructure:$dri_msg"
+echo "  Support for Present extension? $PRESENT"
 echo "  Support for Xv motion compensation (XvMC and libXvMC):$xvmc_msg"
 echo "  Build additional tools and utilities?$tools_msg"
 if test -n "$xp_msg"; then
diff --git a/src/uxa/Makefile.am b/src/uxa/Makefile.am
index 3c9e693..1f6f942 100644
--- a/src/uxa/Makefile.am
+++ b/src/uxa/Makefile.am
@@ -87,6 +87,12 @@ libuxa_la_SOURCES += \
 	$(NULL)
 endif
 
+if PRESENT
+libuxa_la_SOURCES += \
+	intel_present.c \
+	$(NULL)
+endif
+
 if XVMC
 AM_CFLAGS += -I$(top_srcdir)/xvmc
 libuxa_la_SOURCES += \
diff --git a/src/uxa/intel.h b/src/uxa/intel.h
index c3d00f4..48711e4 100644
--- a/src/uxa/intel.h
+++ b/src/uxa/intel.h
@@ -742,4 +742,19 @@ intel_sync_init(ScreenPtr screen);
 void
 intel_sync_close(ScreenPtr screen);
 
+/*
+ * intel_present.c
+ */
+
+#if 0
+#define DebugPresent(x) ErrorF x
+#else
+#define DebugPresent(x)
+#endif
+
+#if PRESENT
+Bool
+intel_present_screen_init(ScreenPtr screen);
+#endif
+
 #endif /* _I830_H_ */
diff --git a/src/uxa/intel_driver.c b/src/uxa/intel_driver.c
index 12c7b34..c760ff6 100644
--- a/src/uxa/intel_driver.c
+++ b/src/uxa/intel_driver.c
@@ -1050,6 +1050,10 @@ I830ScreenInit(SCREEN_INIT_ARGS_DECL)
 	if (intel->XvEnabled)
 		I830InitVideo(screen);
 
+#if PRESENT
+        intel_present_screen_init(screen);
+#endif
+
 #if DRI3
         intel_dri3_screen_init(screen);
 #endif
diff --git a/src/uxa/intel_present.c b/src/uxa/intel_present.c
new file mode 100644
index 0000000..297497b
--- /dev/null
+++ b/src/uxa/intel_present.c
@@ -0,0 +1,406 @@
+/*
+ * Copyright © 2013 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/time.h>
+#include <time.h>
+#include <errno.h>
+
+#include "xf86.h"
+#include "xf86_OSproc.h"
+
+#include "xf86Pci.h"
+#include "xf86drm.h"
+
+#include "windowstr.h"
+#include "shadow.h"
+#include "fb.h"
+
+#include "intel.h"
+#include "i830_reg.h"
+
+#include "i915_drm.h"
+
+#include "present.h"
+
+#include "intel_glamor.h"
+#include "uxa.h"
+
+struct intel_present_vblank_event {
+        uint64_t        event_id;
+};
+
+static uint32_t pipe_select(int pipe)
+{
+	if (pipe > 1)
+		return pipe << DRM_VBLANK_HIGH_CRTC_SHIFT;
+	else if (pipe > 0)
+		return DRM_VBLANK_SECONDARY;
+	else
+		return 0;
+}
+
+static RRCrtcPtr
+intel_present_get_crtc(WindowPtr window)
+{
+	ScreenPtr screen = window->drawable.pScreen;
+	ScrnInfoPtr pScrn = xf86ScreenToScrn(screen);
+	BoxRec box, crtcbox;
+	xf86CrtcPtr crtc;
+        RRCrtcPtr randr_crtc = NULL;
+
+	box.x1 = window->drawable.x;
+	box.y1 = window->drawable.y;
+	box.x2 = box.x1 + window->drawable.width;
+	box.y2 = box.y1 + window->drawable.height;
+
+	crtc = intel_covering_crtc(pScrn, &box, NULL, &crtcbox);
+
+	/* Make sure the CRTC is valid and this is the real front buffer */
+	if (crtc != NULL && !crtc->rotatedData)
+		randr_crtc = crtc->randr_crtc;
+
+	return randr_crtc;
+}
+
+static int
+intel_present_crtc_pipe(ScreenPtr screen, RRCrtcPtr randr_crtc)
+{
+        xf86CrtcPtr crtc;
+
+        if (randr_crtc == NULL)
+                return 0;
+
+        crtc = randr_crtc->devPrivate;
+        return intel_crtc_to_pipe(crtc);
+}
+
+static int
+intel_present_get_ust_msc(RRCrtcPtr crtc, CARD64 *ust, CARD64 *msc)
+{
+        xf86CrtcPtr             xf86_crtc = crtc->devPrivate;
+	ScreenPtr               screen = crtc->pScreen;
+	ScrnInfoPtr             scrn = xf86ScreenToScrn(screen);
+
+        return intel_get_crtc_msc_ust(scrn, xf86_crtc, msc, ust);
+}
+
+/*
+ * Flush the DRM event queue when full; this
+ * makes space for new requests
+ */
+static Bool
+intel_present_flush_drm_events(ScreenPtr screen)
+{
+	ScrnInfoPtr             scrn = xf86ScreenToScrn(screen);
+	intel_screen_private    *intel = intel_get_screen_private(scrn);
+
+        return intel_mode_read_drm_events(intel) >= 0;
+}
+
+/*
+ * Called when the queued vblank event has occurred
+ */
+static void
+intel_present_vblank_handler(ScrnInfoPtr scrn, xf86CrtcPtr crtc, uint64_t msc, uint64_t usec, void *data)
+{
+        struct intel_present_vblank_event       *event = data;
+
+        present_event_notify(event->event_id, usec, msc);
+        free(event);
+}
+
+/*
+ * Called when the queued vblank is aborted
+ */
+static void
+intel_present_vblank_abort(ScrnInfoPtr scrn, xf86CrtcPtr crtc, void *data)
+{
+        struct intel_present_vblank_event       *event = data;
+
+        free(event);
+}
+
+/*
+ * Queue an event to report back to the Present extension when the specified
+ * MSC has past
+ */
+static int
+intel_present_queue_vblank(RRCrtcPtr                    crtc,
+                           uint64_t                     event_id,
+                           uint64_t                     msc)
+{
+        xf86CrtcPtr                             xf86_crtc = crtc->devPrivate;
+	ScreenPtr                               screen = crtc->pScreen;
+	ScrnInfoPtr                             scrn = xf86ScreenToScrn(screen);
+	intel_screen_private                    *intel = intel_get_screen_private(scrn);
+        int                                     pipe = intel_present_crtc_pipe(screen, crtc);
+        struct intel_present_vblank_event       *event;
+	drmVBlank                               vbl;
+        int                                     ret;
+        uint32_t                                seq;
+
+        event = calloc(sizeof (struct intel_present_vblank_event), 1);
+        if (!event)
+                return BadAlloc;
+        event->event_id = event_id;
+        seq = intel_drm_queue_alloc(scrn, xf86_crtc, event,
+                                    intel_present_vblank_handler,
+                                    intel_present_vblank_abort);
+        if (!seq) {
+                free(event);
+                return BadAlloc;
+        }
+
+        vbl.request.type = DRM_VBLANK_ABSOLUTE | DRM_VBLANK_EVENT | pipe_select(pipe);
+        vbl.request.sequence = intel_crtc_msc_to_sequence(scrn, xf86_crtc, msc);
+        vbl.request.signal = seq;
+        for (;;) {
+                ret = drmWaitVBlank(intel->drmSubFD, &vbl);
+                if (!ret)
+                        break;
+                if (errno != EBUSY || !intel_present_flush_drm_events(screen))
+                        return BadAlloc;
+        }
+        DebugPresent(("\t\tiq %lld seq %u msc %u (hw msc %u)\n", event_id, seq, low_msc, vbl.request.sequence));
+        return Success;
+}
+
+static Bool
+intel_present_event_match(void *data, void *match_data)
+{
+        struct intel_present_vblank_event       *event = data;
+        uint64_t                                *match = match_data;
+
+        return *match == event->event_id;
+}
+
+
+/*
+ * Remove a pending vblank event from the DRM queue so that it is not reported
+ * to the extension
+ */
+static void
+intel_present_abort_vblank(RRCrtcPtr crtc, uint64_t event_id, uint64_t msc)
+{
+	ScreenPtr       screen = crtc->pScreen;
+	ScrnInfoPtr     scrn = xf86ScreenToScrn(screen);
+
+        intel_drm_abort (scrn, intel_present_event_match, &event_id);
+}
+
+/*
+ * Flush our batch buffer when requested by the Present extension.
+ */
+static void
+intel_present_flush(WindowPtr window)
+{
+	ScreenPtr                               screen = window->drawable.pScreen;
+	ScrnInfoPtr                             scrn = xf86ScreenToScrn(screen);
+	intel_screen_private                    *intel = intel_get_screen_private(scrn);
+
+        if (intel->needs_flush) {
+                if (intel->has_kernel_flush)
+                        intel_batch_submit(intel->scrn);
+                else
+                        intel_batch_emit_flush(intel->scrn);
+        }
+}
+
+/*
+ * Test to see if page flipping is possible on the target crtc
+ */
+static Bool
+intel_present_check_flip(RRCrtcPtr              crtc,
+                         WindowPtr              window,
+                         PixmapPtr              pixmap,
+                         Bool                   sync_flip)
+{
+        xf86CrtcPtr             xf86_crtc = crtc->devPrivate;
+	ScreenPtr               screen = window->drawable.pScreen;
+	ScrnInfoPtr             scrn = xf86ScreenToScrn(screen);
+	intel_screen_private    *intel = intel_get_screen_private(scrn);
+
+        if (!scrn->vtSema)
+                return FALSE;
+
+        if (intel->shadow_present)
+                return FALSE;
+
+	if (!intel->use_pageflipping)
+		return FALSE;
+
+        if (!intel_crtc_on(xf86_crtc))
+                return FALSE;
+
+        return TRUE;
+}
+
+/*
+ * Once the flip has been completed on all pipes, notify the
+ * extension code telling it when that happened
+ */
+
+static void
+intel_present_flip_event(uint64_t msc, uint64_t ust, void *pageflip_data)
+{
+        struct intel_present_vblank_event *event = pageflip_data;
+
+        present_event_notify(event->event_id, ust, msc);
+        free(event);
+}
+
+/*
+ * The flip has been aborted, free the structure
+ */
+static void
+intel_present_flip_abort(void *pageflip_data)
+{
+        struct intel_present_vblank_event *event = pageflip_data;
+
+        free(event);
+}
+
+/*
+ * Queue a flip on 'crtc' to 'pixmap' at 'target_msc'. If 'sync_flip' is true,
+ * then wait for vblank. Otherwise, flip immediately
+ */
+
+static Bool
+intel_present_flip(RRCrtcPtr                    crtc,
+                   uint64_t                     event_id,
+                   uint64_t                     target_msc,
+                   PixmapPtr                    pixmap,
+                   Bool                         sync_flip)
+{
+	ScreenPtr                               screen = crtc->pScreen;
+	ScrnInfoPtr                             scrn = xf86ScreenToScrn(screen);
+        xf86CrtcPtr                             xf86_crtc = crtc->devPrivate;
+	intel_screen_private                    *intel = intel_get_screen_private(scrn);
+        struct intel_present_vblank_event       *event;
+        int                                     pipe = intel_present_crtc_pipe(screen, crtc);
+        dri_bo                                  *bo;
+        Bool                                    ret;
+
+        if (!intel_crtc_on(xf86_crtc))
+                return FALSE;
+
+        bo = intel_get_pixmap_bo(pixmap);
+        if (!bo)
+                return FALSE;
+
+        event = calloc (1, sizeof (struct intel_present_vblank_event));
+        if (!event)
+                return FALSE;
+
+        event->event_id = event_id;
+
+        ret = intel_do_pageflip(intel, bo, pipe, !sync_flip,
+                                event,
+                                intel_present_flip_event,
+                                intel_present_flip_abort);
+        if (!ret)
+                xf86DrvMsg(scrn->scrnIndex, X_ERROR,
+                           "present flip failed\n");
+        return ret;
+}
+
+/*
+ * Queue a flip back to the normal frame buffer
+ */
+static void
+intel_present_unflip(ScreenPtr screen, uint64_t event_id)
+{
+	ScrnInfoPtr                             scrn = xf86ScreenToScrn(screen);
+	intel_screen_private                    *intel = intel_get_screen_private(scrn);
+        struct intel_present_vblank_event       *event;
+        PixmapPtr                               pixmap = screen->GetScreenPixmap(screen);
+        dri_bo                                  *bo;
+        Bool                                    ret;
+
+        bo = intel_get_pixmap_bo(pixmap);
+        if (!bo)
+                return;
+
+        event = calloc (1, sizeof (struct intel_present_vblank_event));
+        if (!event)
+                return;
+
+        event->event_id = event_id;
+
+        ret = intel_do_pageflip(intel, bo, 0, FALSE, event, intel_present_flip_event, intel_present_flip_abort);
+        if (!ret) {
+                xf86DrvMsg(scrn->scrnIndex, X_ERROR,
+                           "present unflip failed\n");
+        }
+}
+
+static present_screen_info_rec intel_present_screen_info = {
+        .version = PRESENT_SCREEN_INFO_VERSION,
+
+        .get_crtc = intel_present_get_crtc,
+        .get_ust_msc = intel_present_get_ust_msc,
+        .queue_vblank = intel_present_queue_vblank,
+        .abort_vblank = intel_present_abort_vblank,
+        .flush = intel_present_flush,
+
+        .capabilities = PresentCapabilityNone,
+        .check_flip = intel_present_check_flip,
+        .flip = intel_present_flip,
+        .unflip = intel_present_unflip,
+};
+
+static Bool
+intel_present_has_async_flip(ScreenPtr screen)
+{
+#ifdef DRM_CAP_ASYNC_PAGE_FLIP
+	ScrnInfoPtr             scrn = xf86ScreenToScrn(screen);
+	intel_screen_private    *intel = intel_get_screen_private(scrn);
+        int                     ret;
+        uint64_t                value;
+
+        ret = drmGetCap(intel->drmSubFD, DRM_CAP_ASYNC_PAGE_FLIP, &value);
+        if (ret == 0)
+                return value == 1;
+#endif
+        return FALSE;
+}
+
+Bool
+intel_present_screen_init(ScreenPtr screen)
+{
+        if (intel_present_has_async_flip(screen))
+                intel_present_screen_info.capabilities |= PresentCapabilityAsync;
+
+        return present_screen_init(screen, &intel_present_screen_info);
+}
-- 
1.8.4.2

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