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Date: Tue, 25 Jul 2017 09:27:33 -0700
From: Eric Anholt <eric@...olt.net>
To: dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>
Subject: [PATCH 2/2] drm/vc4: Add exec flags to allow forcing a specific X/Y tile walk order.
This is useful to allow GL to provide defined results for overlapping
glBlitFramebuffer, which X11 in turn uses to accelerate uncomposited
window movement without first blitting to a temporary. x11perf
-copywinwin100 goes from 1850/sec to 4850/sec.
Signed-off-by: Eric Anholt <eric@...olt.net>
---
The work-in-progress userspace is at:
https://github.com/anholt/xserver/commits/glamor-draw-bounds-overlap
https://github.com/anholt/mesa/commits/vc4-overlapping-blit
and the next step is to build the GL extension spec and piglit tests
for it.
drivers/gpu/drm/vc4/vc4_drv.c | 1 +
drivers/gpu/drm/vc4/vc4_gem.c | 5 ++++-
drivers/gpu/drm/vc4/vc4_render_cl.c | 21 ++++++++++++++++-----
include/uapi/drm/vc4_drm.h | 11 +++++++++++
4 files changed, 32 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index c6b487c3d2b7..b5c2c28289ed 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -99,6 +99,7 @@ static int vc4_get_param_ioctl(struct drm_device *dev, void *data,
case DRM_VC4_PARAM_SUPPORTS_BRANCHES:
case DRM_VC4_PARAM_SUPPORTS_ETC1:
case DRM_VC4_PARAM_SUPPORTS_THREADED_FS:
+ case DRM_VC4_PARAM_SUPPORTS_FIXED_RCL_ORDER:
args->value = true;
break;
default:
diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c
index a3e45e67f417..ba0782ebda34 100644
--- a/drivers/gpu/drm/vc4/vc4_gem.c
+++ b/drivers/gpu/drm/vc4/vc4_gem.c
@@ -1008,7 +1008,10 @@ vc4_submit_cl_ioctl(struct drm_device *dev, void *data,
struct ww_acquire_ctx acquire_ctx;
int ret = 0;
- if ((args->flags & ~VC4_SUBMIT_CL_USE_CLEAR_COLOR) != 0) {
+ if ((args->flags & ~(VC4_SUBMIT_CL_USE_CLEAR_COLOR |
+ VC4_SUBMIT_CL_FIXED_RCL_ORDER |
+ VC4_SUBMIT_CL_RCL_ORDER_INCREASING_X |
+ VC4_SUBMIT_CL_RCL_ORDER_INCREASING_Y)) != 0) {
DRM_DEBUG("Unknown flags: 0x%02x\n", args->flags);
return -EINVAL;
}
diff --git a/drivers/gpu/drm/vc4/vc4_render_cl.c b/drivers/gpu/drm/vc4/vc4_render_cl.c
index da3bfd53f0bd..c3b064052147 100644
--- a/drivers/gpu/drm/vc4/vc4_render_cl.c
+++ b/drivers/gpu/drm/vc4/vc4_render_cl.c
@@ -261,8 +261,17 @@ static int vc4_create_rcl_bo(struct drm_device *dev, struct vc4_exec_info *exec,
uint8_t max_y_tile = args->max_y_tile;
uint8_t xtiles = max_x_tile - min_x_tile + 1;
uint8_t ytiles = max_y_tile - min_y_tile + 1;
- uint8_t x, y;
+ uint8_t xi, yi;
uint32_t size, loop_body_size;
+ bool positive_x = false;
+ bool positive_y = false;
+
+ if (args->flags & VC4_SUBMIT_CL_FIXED_RCL_ORDER) {
+ if (args->flags & VC4_SUBMIT_CL_RCL_ORDER_INCREASING_X)
+ positive_x = true;
+ if (args->flags & VC4_SUBMIT_CL_RCL_ORDER_INCREASING_Y)
+ positive_y = true;
+ }
size = VC4_PACKET_TILE_RENDERING_MODE_CONFIG_SIZE;
loop_body_size = VC4_PACKET_TILE_COORDINATES_SIZE;
@@ -354,10 +363,12 @@ static int vc4_create_rcl_bo(struct drm_device *dev, struct vc4_exec_info *exec,
rcl_u16(setup, args->height);
rcl_u16(setup, args->color_write.bits);
- for (y = min_y_tile; y <= max_y_tile; y++) {
- for (x = min_x_tile; x <= max_x_tile; x++) {
- bool first = (x == min_x_tile && y == min_y_tile);
- bool last = (x == max_x_tile && y == max_y_tile);
+ for (yi = 0; yi < ytiles; yi++) {
+ int y = positive_y ? min_y_tile + yi : max_y_tile - yi;
+ for (xi = 0; xi < xtiles; xi++) {
+ int x = positive_x ? min_x_tile + xi : max_x_tile - xi;
+ bool first = (xi == 0 && yi == 0);
+ bool last = (xi == xtiles - 1 && yi == ytiles - 1);
emit_tile(exec, setup, x, y, first, last);
}
diff --git a/include/uapi/drm/vc4_drm.h b/include/uapi/drm/vc4_drm.h
index 6ac4c5c014cb..a8bf9a76d5b6 100644
--- a/include/uapi/drm/vc4_drm.h
+++ b/include/uapi/drm/vc4_drm.h
@@ -153,6 +153,16 @@ struct drm_vc4_submit_cl {
__u32 pad:24;
#define VC4_SUBMIT_CL_USE_CLEAR_COLOR (1 << 0)
+/* By default, the kernel gets to choose the order that the tiles are
+ * rendered in. If this is set, then the tiles will be rendered in a
+ * raster order, with the right-to-left vs left-to-right and
+ * top-to-bottom vs bottom-to-top dictated by
+ * VC4_SUBMIT_CL_RCL_ORDER_INCREASING_*. This allows overlapping
+ * blits to be implemented using the 3D engine.
+ */
+#define VC4_SUBMIT_CL_FIXED_RCL_ORDER (1 << 1)
+#define VC4_SUBMIT_CL_RCL_ORDER_INCREASING_X (1 << 2)
+#define VC4_SUBMIT_CL_RCL_ORDER_INCREASING_Y (1 << 3)
__u32 flags;
/* Returned value of the seqno of this render job (for the
@@ -292,6 +302,7 @@ struct drm_vc4_get_hang_state {
#define DRM_VC4_PARAM_SUPPORTS_BRANCHES 3
#define DRM_VC4_PARAM_SUPPORTS_ETC1 4
#define DRM_VC4_PARAM_SUPPORTS_THREADED_FS 5
+#define DRM_VC4_PARAM_SUPPORTS_FIXED_RCL_ORDER 6
struct drm_vc4_get_param {
__u32 param;
--
2.11.0
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