gallium: support for native fence fd's

This enables gallium support for EGL_ANDROID_native_fence_sync, for
drivers which support PIPE_CAP_NATIVE_FENCE_FD.

Signed-off-by: Rob Clark <robclark@freedesktop.org>

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -379,6 +379,8 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 		return 10;
 	case PIPE_CAP_UMA:
 		return 1;
+	case PIPE_CAP_NATIVE_FENCE_FD:
+		return 0;
 	}
 	debug_printf("unknown param %d\n", param);
 	return 0;

src/gallium/drivers/i915/i915_screen.c

@@ -295,6 +295,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
    case PIPE_CAP_SAMPLER_VIEW_TARGET:
    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
    case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+   case PIPE_CAP_NATIVE_FENCE_FD:
       return 0;
 
    case PIPE_CAP_MAX_VIEWPORTS:

src/gallium/drivers/ilo/ilo_screen.c

@@ -518,6 +518,7 @@ ilo_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
    case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
    case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+   case PIPE_CAP_NATIVE_FENCE_FD:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -339,6 +339,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
    case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+   case PIPE_CAP_NATIVE_FENCE_FD:
       return 0;
    }
    /* should only get here on unhandled cases */

src/gallium/drivers/nouveau/nv30/nv30_screen.c

@@ -204,6 +204,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
    case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
    case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+   case PIPE_CAP_NATIVE_FENCE_FD:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/nouveau/nv50/nv50_screen.c

@@ -256,6 +256,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
    case PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS:
    case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+   case PIPE_CAP_NATIVE_FENCE_FD:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -275,6 +275,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_PCI_FUNCTION:
    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
    case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+   case PIPE_CAP_NATIVE_FENCE_FD:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/r300/r300_screen.c

@@ -226,6 +226,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
         case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
         case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+        case PIPE_CAP_NATIVE_FENCE_FD:
             return 0;
 
         /* SWTCL-only features. */

src/gallium/drivers/r600/r600_pipe.c

@@ -375,6 +375,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_MAX_WINDOW_RECTANGLES:
 	case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
 	case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+	case PIPE_CAP_NATIVE_FENCE_FD:
 		return 0;
 
 	case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:

src/gallium/drivers/radeonsi/si_pipe.c

@@ -459,6 +459,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
 	case PIPE_CAP_TGSI_VOTE:
 	case PIPE_CAP_MAX_WINDOW_RECTANGLES:
+	case PIPE_CAP_NATIVE_FENCE_FD:
 		return 0;
 
 	case PIPE_CAP_QUERY_BUFFER_OBJECT:

src/gallium/drivers/softpipe/sp_screen.c

@@ -289,6 +289,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
    case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+   case PIPE_CAP_NATIVE_FENCE_FD:
       return 0;
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
       return 4;

src/gallium/drivers/svga/svga_screen.c

@@ -369,6 +369,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_PCI_DEVICE:
    case PIPE_CAP_PCI_FUNCTION:
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
+   case PIPE_CAP_NATIVE_FENCE_FD:
       return 0;
    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
       return 64;

src/gallium/drivers/vc4/vc4_screen.c

@@ -240,6 +240,7 @@ vc4_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
         case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
         case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+        case PIPE_CAP_NATIVE_FENCE_FD:
                 return 0;
 
                 /* Stream output. */

src/gallium/drivers/virgl/virgl_screen.c

@@ -261,6 +261,8 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_UMA:
    case PIPE_CAP_VIDEO_MEMORY:
       return 0;
+   case PIPE_CAP_NATIVE_FENCE_FD:
+      return 0;
    }
    /* should only get here on unhandled cases */
    debug_printf("Unexpected PIPE_CAP %d query\n", param);

src/gallium/include/pipe/p_context.h

@@ -474,6 +474,19 @@ struct pipe_context {
                  struct pipe_fence_handle **fence,
                  unsigned flags);
 
+   /**
+    * Create a fence from a native sync fd.
+    *
+    * This is used for importing a foreign/external fence fd.
+    *
+    * \param fence  if not NULL, an old fence to unref and transfer a
+    *    new fence reference to
+    * \param fd     native fence fd
+    */
+   void (*create_fence_fd)(struct pipe_context *pipe,
+                           struct pipe_fence_handle **fence,
+                           int fd);
+
    /**
     * Insert commands to have GPU wait for fence to be signaled.
     */

src/gallium/include/pipe/p_defines.h

@@ -350,6 +350,7 @@ enum pipe_flush_flags
 {
    PIPE_FLUSH_END_OF_FRAME = (1 << 0),
    PIPE_FLUSH_DEFERRED = (1 << 1),
+   PIPE_FLUSH_FENCE_FD = (1 << 2),
 };
 
 /**
@@ -741,6 +742,7 @@ enum pipe_cap
    PIPE_CAP_TGSI_ARRAY_COMPONENTS,
    PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS,
    PIPE_CAP_TGSI_CAN_READ_OUTPUTS,
+   PIPE_CAP_NATIVE_FENCE_FD,
 };
 
 #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)

src/gallium/include/pipe/p_screen.h

@@ -264,6 +264,16 @@ struct pipe_screen {
                            struct pipe_fence_handle *fence,
                            uint64_t timeout);
 
+   /**
+    * For fences created with PIPE_FLUSH_FENCE_FD (exported fd) or
+    * by create_fence_fd() (imported fd), return the native fence fd
+    * associated with the fence.  This may return -1 for fences
+    * created with PIPE_FLUSH_DEFERRED if the fence command has not
+    * been flushed yet.
+    */
+   int (*fence_get_fd)(struct pipe_screen *screen,
+                       struct pipe_fence_handle *fence);
+
    /**
     * Returns a driver-specific query.
     *

src/gallium/state_trackers/dri/dri2.c

@@ -1457,6 +1457,18 @@ struct dri2_fence {
    void *cl_event;
 };
 
+static unsigned dri2_fence_get_caps(__DRIscreen *_screen)
+{
+   struct dri_screen *driscreen = dri_screen(_screen);
+   struct pipe_screen *screen = driscreen->base.screen;
+   unsigned caps = 0;
+
+   if (screen->get_param(screen, PIPE_CAP_NATIVE_FENCE_FD))
+      caps |= __DRI_FENCE_CAP_NATIVE_FD;
+
+   return caps;
+}
+
 static void *
 dri2_create_fence(__DRIcontext *_ctx)
 {
@@ -1477,6 +1489,39 @@ dri2_create_fence(__DRIcontext *_ctx)
    return fence;
 }
 
+static void *
+dri2_create_fence_fd(__DRIcontext *_ctx, int fd)
+{
+   struct pipe_context *ctx = dri_context(_ctx)->st->pipe;
+   struct dri2_fence *fence = CALLOC_STRUCT(dri2_fence);
+
+   if (fd == -1) {
+      /* exporting driver created fence, flush: */
+      ctx->flush(ctx, &fence->pipe_fence,
+                 PIPE_FLUSH_DEFERRED | PIPE_FLUSH_FENCE_FD);
+   } else {
+      /* importing a foreign fence fd: */
+      ctx->create_fence_fd(ctx, &fence->pipe_fence, fd);
+   }
+   if (!fence->pipe_fence) {
+      FREE(fence);
+      return NULL;
+   }
+
+   fence->driscreen = dri_screen(_ctx->driScreenPriv);
+   return fence;
+}
+
+static int
+dri2_get_fence_fd(__DRIscreen *_screen, void *_fence)
+{
+   struct dri_screen *driscreen = dri_screen(_screen);
+   struct pipe_screen *screen = driscreen->base.screen;
+   struct dri2_fence *fence = (struct dri2_fence*)_fence;
+
+   return screen->fence_get_fd(screen, fence->pipe_fence);
+}
+
 static void *
 dri2_get_fence_from_cl_event(__DRIscreen *_screen, intptr_t cl_event)
 {
@@ -1556,13 +1601,16 @@ dri2_server_wait_sync(__DRIcontext *_ctx, void *_fence, unsigned flags)
 }
 
 static __DRI2fenceExtension dri2FenceExtension = {
-   .base = { __DRI2_FENCE, 1 },
+   .base = { __DRI2_FENCE, 2 },
 
    .create_fence = dri2_create_fence,
    .get_fence_from_cl_event = dri2_get_fence_from_cl_event,
    .destroy_fence = dri2_destroy_fence,
    .client_wait_sync = dri2_client_wait_sync,
-   .server_wait_sync = dri2_server_wait_sync
+   .server_wait_sync = dri2_server_wait_sync,
+   .get_capabilities = dri2_fence_get_caps,
+   .create_fence_fd = dri2_create_fence_fd,
+   .get_fence_fd = dri2_get_fence_fd,
 };
 
 static const __DRIrobustnessExtension dri2Robustness = {