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openwrt/target/linux/brcm2708/patches-4.4/0116-drm-vc4-Add-support-for-MSAA-rendering.patch
Álvaro Fernández Rojas 525b311bf8 brcm2708: update linux 4.4 patches to latest version 
As usual these patches were extracted from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.4.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2016-04-24 13:03:39 +02:00

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From cd77071a812478dd844c4099ddff4022e2ea1ba0 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Fri, 17 Jul 2015 13:15:50 -0700
Subject: [PATCH 116/304] drm/vc4: Add support for MSAA rendering.
For MSAA, you set a bit in the binner that halves the size of tiles in
each direction, so you can pack 4 samples per pixel in the tile
buffer. During rendering, you can load and store raw tile buffer
contents (to save the per-sample MSAA contents), or you can load/store
resolved tile buffer contents (loads spam the pixel value to all 4
samples, and stores either average the 4 color samples, or store the
first sample for Z/S).
Signed-off-by: Eric Anholt <eric@anholt.net>
---
drivers/gpu/drm/vc4/vc4_packet.h | 23 ++-
drivers/gpu/drm/vc4/vc4_render_cl.c | 274 ++++++++++++++++++++++++++++++------
drivers/gpu/drm/vc4/vc4_validate.c | 5 +-
include/uapi/drm/vc4_drm.h | 11 +-
4 files changed, 258 insertions(+), 55 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_packet.h
+++ b/drivers/gpu/drm/vc4/vc4_packet.h
@@ -123,6 +123,11 @@ enum vc4_packet {
#define VC4_PACKET_TILE_COORDINATES_SIZE 3
#define VC4_PACKET_GEM_HANDLES_SIZE 9
+/* Number of multisamples supported. */
+#define VC4_MAX_SAMPLES 4
+/* Size of a full resolution color or Z tile buffer load/store. */
+#define VC4_TILE_BUFFER_SIZE (64 * 64 * 4)
+
/** @{
* Bits used by packets like VC4_PACKET_STORE_TILE_BUFFER_GENERAL and
* VC4_PACKET_TILE_RENDERING_MODE_CONFIG.
@@ -137,10 +142,20 @@ enum vc4_packet {
* low bits of VC4_PACKET_STORE_FULL_RES_TILE_BUFFER and
* VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER.
*/
-#define VC4_LOADSTORE_FULL_RES_EOF (1 << 3)
-#define VC4_LOADSTORE_FULL_RES_DISABLE_CLEAR_ALL (1 << 2)
-#define VC4_LOADSTORE_FULL_RES_DISABLE_ZS (1 << 1)
-#define VC4_LOADSTORE_FULL_RES_DISABLE_COLOR (1 << 0)
+#define VC4_LOADSTORE_FULL_RES_EOF BIT(3)
+#define VC4_LOADSTORE_FULL_RES_DISABLE_CLEAR_ALL BIT(2)
+#define VC4_LOADSTORE_FULL_RES_DISABLE_ZS BIT(1)
+#define VC4_LOADSTORE_FULL_RES_DISABLE_COLOR BIT(0)
+
+/** @{
+ *
+ * low bits of VC4_PACKET_STORE_FULL_RES_TILE_BUFFER and
+ * VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER.
+ */
+#define VC4_LOADSTORE_FULL_RES_EOF BIT(3)
+#define VC4_LOADSTORE_FULL_RES_DISABLE_CLEAR_ALL BIT(2)
+#define VC4_LOADSTORE_FULL_RES_DISABLE_ZS BIT(1)
+#define VC4_LOADSTORE_FULL_RES_DISABLE_COLOR BIT(0)
/** @{
*
--- a/drivers/gpu/drm/vc4/vc4_render_cl.c
+++ b/drivers/gpu/drm/vc4/vc4_render_cl.c
@@ -37,9 +37,11 @@
struct vc4_rcl_setup {
struct drm_gem_cma_object *color_read;
- struct drm_gem_cma_object *color_ms_write;
+ struct drm_gem_cma_object *color_write;
struct drm_gem_cma_object *zs_read;
struct drm_gem_cma_object *zs_write;
+ struct drm_gem_cma_object *msaa_color_write;
+ struct drm_gem_cma_object *msaa_zs_write;
struct drm_gem_cma_object *rcl;
u32 next_offset;
@@ -82,6 +84,22 @@ static void vc4_store_before_load(struct
}
/*
+ * Calculates the physical address of the start of a tile in a RCL surface.
+ *
+ * Unlike the other load/store packets,
+ * VC4_PACKET_LOAD/STORE_FULL_RES_TILE_BUFFER don't look at the tile
+ * coordinates packet, and instead just store to the address given.
+ */
+static uint32_t vc4_full_res_offset(struct vc4_exec_info *exec,
+ struct drm_gem_cma_object *bo,
+ struct drm_vc4_submit_rcl_surface *surf,
+ uint8_t x, uint8_t y)
+{
+ return bo->paddr + surf->offset + VC4_TILE_BUFFER_SIZE *
+ (DIV_ROUND_UP(exec->args->width, 32) * y + x);
+}
+
+/*
* Emits a PACKET_TILE_COORDINATES if one isn't already pending.
*
* The tile coordinates packet triggers a pending load if there is one, are
@@ -108,22 +126,41 @@ static void emit_tile(struct vc4_exec_in
* may be outstanding at a time.
*/
if (setup->color_read) {
- rcl_u8(setup, VC4_PACKET_LOAD_TILE_BUFFER_GENERAL);
- rcl_u16(setup, args->color_read.bits);
- rcl_u32(setup,
- setup->color_read->paddr + args->color_read.offset);
+ if (args->color_read.flags &
+ VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES) {
+ rcl_u8(setup, VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER);
+ rcl_u32(setup,
+ vc4_full_res_offset(exec, setup->color_read,
+ &args->color_read, x, y) |
+ VC4_LOADSTORE_FULL_RES_DISABLE_ZS);
+ } else {
+ rcl_u8(setup, VC4_PACKET_LOAD_TILE_BUFFER_GENERAL);
+ rcl_u16(setup, args->color_read.bits);
+ rcl_u32(setup, setup->color_read->paddr +
+ args->color_read.offset);
+ }
}
if (setup->zs_read) {
- if (setup->color_read) {
- /* Exec previous load. */
- vc4_tile_coordinates(setup, x, y);
- vc4_store_before_load(setup);
+ if (args->zs_read.flags &
+ VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES) {
+ rcl_u8(setup, VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER);
+ rcl_u32(setup,
+ vc4_full_res_offset(exec, setup->zs_read,
+ &args->zs_read, x, y) |
+ VC4_LOADSTORE_FULL_RES_DISABLE_COLOR);
+ } else {
+ if (setup->color_read) {
+ /* Exec previous load. */
+ vc4_tile_coordinates(setup, x, y);
+ vc4_store_before_load(setup);
+ }
+
+ rcl_u8(setup, VC4_PACKET_LOAD_TILE_BUFFER_GENERAL);
+ rcl_u16(setup, args->zs_read.bits);
+ rcl_u32(setup, setup->zs_read->paddr +
+ args->zs_read.offset);
}
-
- rcl_u8(setup, VC4_PACKET_LOAD_TILE_BUFFER_GENERAL);
- rcl_u16(setup, args->zs_read.bits);
- rcl_u32(setup, setup->zs_read->paddr + args->zs_read.offset);
}
/* Clipping depends on tile coordinates having been
@@ -144,20 +181,60 @@ static void emit_tile(struct vc4_exec_in
(y * exec->bin_tiles_x + x) * 32));
}
+ if (setup->msaa_color_write) {
+ bool last_tile_write = (!setup->msaa_zs_write &&
+ !setup->zs_write &&
+ !setup->color_write);
+ uint32_t bits = VC4_LOADSTORE_FULL_RES_DISABLE_ZS;
+
+ if (!last_tile_write)
+ bits |= VC4_LOADSTORE_FULL_RES_DISABLE_CLEAR_ALL;
+ else if (last)
+ bits |= VC4_LOADSTORE_FULL_RES_EOF;
+ rcl_u8(setup, VC4_PACKET_STORE_FULL_RES_TILE_BUFFER);
+ rcl_u32(setup,
+ vc4_full_res_offset(exec, setup->msaa_color_write,
+ &args->msaa_color_write, x, y) |
+ bits);
+ }
+
+ if (setup->msaa_zs_write) {
+ bool last_tile_write = (!setup->zs_write &&
+ !setup->color_write);
+ uint32_t bits = VC4_LOADSTORE_FULL_RES_DISABLE_COLOR;
+
+ if (setup->msaa_color_write)
+ vc4_tile_coordinates(setup, x, y);
+ if (!last_tile_write)
+ bits |= VC4_LOADSTORE_FULL_RES_DISABLE_CLEAR_ALL;
+ else if (last)
+ bits |= VC4_LOADSTORE_FULL_RES_EOF;
+ rcl_u8(setup, VC4_PACKET_STORE_FULL_RES_TILE_BUFFER);
+ rcl_u32(setup,
+ vc4_full_res_offset(exec, setup->msaa_zs_write,
+ &args->msaa_zs_write, x, y) |
+ bits);
+ }
+
if (setup->zs_write) {
+ bool last_tile_write = !setup->color_write;
+
+ if (setup->msaa_color_write || setup->msaa_zs_write)
+ vc4_tile_coordinates(setup, x, y);
+
rcl_u8(setup, VC4_PACKET_STORE_TILE_BUFFER_GENERAL);
rcl_u16(setup, args->zs_write.bits |
- (setup->color_ms_write ?
- VC4_STORE_TILE_BUFFER_DISABLE_COLOR_CLEAR : 0));
+ (last_tile_write ?
+ 0 : VC4_STORE_TILE_BUFFER_DISABLE_COLOR_CLEAR));
rcl_u32(setup,
(setup->zs_write->paddr + args->zs_write.offset) |
- ((last && !setup->color_ms_write) ?
+ ((last && last_tile_write) ?
VC4_LOADSTORE_TILE_BUFFER_EOF : 0));
}
- if (setup->color_ms_write) {
- if (setup->zs_write) {
- /* Reset after previous store */
+ if (setup->color_write) {
+ if (setup->msaa_color_write || setup->msaa_zs_write ||
+ setup->zs_write) {
vc4_tile_coordinates(setup, x, y);
}
@@ -192,14 +269,26 @@ static int vc4_create_rcl_bo(struct drm_
}
if (setup->color_read) {
- loop_body_size += (VC4_PACKET_LOAD_TILE_BUFFER_GENERAL_SIZE);
+ if (args->color_read.flags &
+ VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES) {
+ loop_body_size += VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER_SIZE;
+ } else {
+ loop_body_size += VC4_PACKET_LOAD_TILE_BUFFER_GENERAL_SIZE;
+ }
}
if (setup->zs_read) {
- if (setup->color_read) {
- loop_body_size += VC4_PACKET_TILE_COORDINATES_SIZE;
- loop_body_size += VC4_PACKET_STORE_TILE_BUFFER_GENERAL_SIZE;
+ if (args->zs_read.flags &
+ VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES) {
+ loop_body_size += VC4_PACKET_LOAD_FULL_RES_TILE_BUFFER_SIZE;
+ } else {
+ if (setup->color_read &&
+ !(args->color_read.flags &
+ VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES)) {
+ loop_body_size += VC4_PACKET_TILE_COORDINATES_SIZE;
+ loop_body_size += VC4_PACKET_STORE_TILE_BUFFER_GENERAL_SIZE;
+ }
+ loop_body_size += VC4_PACKET_LOAD_TILE_BUFFER_GENERAL_SIZE;
}
- loop_body_size += VC4_PACKET_LOAD_TILE_BUFFER_GENERAL_SIZE;
}
if (has_bin) {
@@ -207,13 +296,23 @@ static int vc4_create_rcl_bo(struct drm_
loop_body_size += VC4_PACKET_BRANCH_TO_SUB_LIST_SIZE;
}
+ if (setup->msaa_color_write)
+ loop_body_size += VC4_PACKET_STORE_FULL_RES_TILE_BUFFER_SIZE;
+ if (setup->msaa_zs_write)
+ loop_body_size += VC4_PACKET_STORE_FULL_RES_TILE_BUFFER_SIZE;
+
if (setup->zs_write)
loop_body_size += VC4_PACKET_STORE_TILE_BUFFER_GENERAL_SIZE;
- if (setup->color_ms_write) {
- if (setup->zs_write)
- loop_body_size += VC4_PACKET_TILE_COORDINATES_SIZE;
+ if (setup->color_write)
loop_body_size += VC4_PACKET_STORE_MS_TILE_BUFFER_SIZE;
- }
+
+ /* We need a VC4_PACKET_TILE_COORDINATES in between each store. */
+ loop_body_size += VC4_PACKET_TILE_COORDINATES_SIZE *
+ ((setup->msaa_color_write != NULL) +
+ (setup->msaa_zs_write != NULL) +
+ (setup->color_write != NULL) +
+ (setup->zs_write != NULL) - 1);
+
size += xtiles * ytiles * loop_body_size;
setup->rcl = &vc4_bo_create(dev, size, true)->base;
@@ -224,13 +323,12 @@ static int vc4_create_rcl_bo(struct drm_
rcl_u8(setup, VC4_PACKET_TILE_RENDERING_MODE_CONFIG);
rcl_u32(setup,
- (setup->color_ms_write ?
- (setup->color_ms_write->paddr +
- args->color_ms_write.offset) :
+ (setup->color_write ? (setup->color_write->paddr +
+ args->color_write.offset) :
0));
rcl_u16(setup, args->width);
rcl_u16(setup, args->height);
- rcl_u16(setup, args->color_ms_write.bits);
+ rcl_u16(setup, args->color_write.bits);
/* The tile buffer gets cleared when the previous tile is stored. If
* the clear values changed between frames, then the tile buffer has
@@ -267,6 +365,56 @@ static int vc4_create_rcl_bo(struct drm_
return 0;
}
+static int vc4_full_res_bounds_check(struct vc4_exec_info *exec,
+ struct drm_gem_cma_object *obj,
+ struct drm_vc4_submit_rcl_surface *surf)
+{
+ struct drm_vc4_submit_cl *args = exec->args;
+ u32 render_tiles_stride = DIV_ROUND_UP(exec->args->width, 32);
+
+ if (surf->offset > obj->base.size) {
+ DRM_ERROR("surface offset %d > BO size %zd\n",
+ surf->offset, obj->base.size);
+ return -EINVAL;
+ }
+
+ if ((obj->base.size - surf->offset) / VC4_TILE_BUFFER_SIZE <
+ render_tiles_stride * args->max_y_tile + args->max_x_tile) {
+ DRM_ERROR("MSAA tile %d, %d out of bounds "
+ "(bo size %zd, offset %d).\n",
+ args->max_x_tile, args->max_y_tile,
+ obj->base.size,
+ surf->offset);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int vc4_rcl_msaa_surface_setup(struct vc4_exec_info *exec,
+ struct drm_gem_cma_object **obj,
+ struct drm_vc4_submit_rcl_surface *surf)
+{
+ if (surf->flags != 0 || surf->bits != 0) {
+ DRM_ERROR("MSAA surface had nonzero flags/bits\n");
+ return -EINVAL;
+ }
+
+ if (surf->hindex == ~0)
+ return 0;
+
+ *obj = vc4_use_bo(exec, surf->hindex);
+ if (!*obj)
+ return -EINVAL;
+
+ if (surf->offset & 0xf) {
+ DRM_ERROR("MSAA write must be 16b aligned.\n");
+ return -EINVAL;
+ }
+
+ return vc4_full_res_bounds_check(exec, *obj, surf);
+}
+
static int vc4_rcl_surface_setup(struct vc4_exec_info *exec,
struct drm_gem_cma_object **obj,
struct drm_vc4_submit_rcl_surface *surf)
@@ -278,9 +426,10 @@ static int vc4_rcl_surface_setup(struct
uint8_t format = VC4_GET_FIELD(surf->bits,
VC4_LOADSTORE_TILE_BUFFER_FORMAT);
int cpp;
+ int ret;
- if (surf->pad != 0) {
- DRM_ERROR("Padding unset\n");
+ if (surf->flags & ~VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES) {
+ DRM_ERROR("Extra flags set\n");
return -EINVAL;
}
@@ -290,6 +439,25 @@ static int vc4_rcl_surface_setup(struct
if (!vc4_use_bo(exec, surf->hindex, VC4_MODE_RENDER, obj))
return -EINVAL;
+ if (surf->flags & VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES) {
+ if (surf == &exec->args->zs_write) {
+ DRM_ERROR("general zs write may not be a full-res.\n");
+ return -EINVAL;
+ }
+
+ if (surf->bits != 0) {
+ DRM_ERROR("load/store general bits set with "
+ "full res load/store.\n");
+ return -EINVAL;
+ }
+
+ ret = vc4_full_res_bounds_check(exec, *obj, surf);
+ if (!ret)
+ return ret;
+
+ return 0;
+ }
+
if (surf->bits & ~(VC4_LOADSTORE_TILE_BUFFER_TILING_MASK |
VC4_LOADSTORE_TILE_BUFFER_BUFFER_MASK |
VC4_LOADSTORE_TILE_BUFFER_FORMAT_MASK)) {
@@ -341,9 +509,10 @@ static int vc4_rcl_surface_setup(struct
}
static int
-vc4_rcl_ms_surface_setup(struct vc4_exec_info *exec,
- struct drm_gem_cma_object **obj,
- struct drm_vc4_submit_rcl_surface *surf)
+vc4_rcl_render_config_surface_setup(struct vc4_exec_info *exec,
+ struct vc4_rcl_setup *setup,
+ struct drm_gem_cma_object **obj,
+ struct drm_vc4_submit_rcl_surface *surf)
{
uint8_t tiling = VC4_GET_FIELD(surf->bits,
VC4_RENDER_CONFIG_MEMORY_FORMAT);
@@ -351,13 +520,15 @@ vc4_rcl_ms_surface_setup(struct vc4_exec
VC4_RENDER_CONFIG_FORMAT);
int cpp;
- if (surf->pad != 0) {
- DRM_ERROR("Padding unset\n");
+ if (surf->flags != 0) {
+ DRM_ERROR("No flags supported on render config.\n");
return -EINVAL;
}
if (surf->bits & ~(VC4_RENDER_CONFIG_MEMORY_FORMAT_MASK |
- VC4_RENDER_CONFIG_FORMAT_MASK)) {
+ VC4_RENDER_CONFIG_FORMAT_MASK |
+ VC4_RENDER_CONFIG_MS_MODE_4X |
+ VC4_RENDER_CONFIG_DECIMATE_MODE_4X)) {
DRM_ERROR("Unknown bits in render config: 0x%04x\n",
surf->bits);
return -EINVAL;
@@ -413,18 +584,20 @@ int vc4_get_rcl(struct drm_device *dev,
if (has_bin &&
(args->max_x_tile > exec->bin_tiles_x ||
args->max_y_tile > exec->bin_tiles_y)) {
- DRM_ERROR("Render tiles (%d,%d) outside of bin config (%d,%d)\n",
+ DRM_ERROR("Render tiles (%d,%d) outside of bin config "
+ "(%d,%d)\n",
args->max_x_tile, args->max_y_tile,
exec->bin_tiles_x, exec->bin_tiles_y);
return -EINVAL;
}
- ret = vc4_rcl_surface_setup(exec, &setup.color_read, &args->color_read);
+ ret = vc4_rcl_render_config_surface_setup(exec, &setup,
+ &setup.color_write,
+ &args->color_write);
if (ret)
return ret;
- ret = vc4_rcl_ms_surface_setup(exec, &setup.color_ms_write,
- &args->color_ms_write);
+ ret = vc4_rcl_surface_setup(exec, &setup.color_read, &args->color_read);
if (ret)
return ret;
@@ -436,10 +609,21 @@ int vc4_get_rcl(struct drm_device *dev,
if (ret)
return ret;
+ ret = vc4_rcl_msaa_surface_setup(exec, &setup.msaa_color_write,
+ &args->msaa_color_write);
+ if (ret)
+ return ret;
+
+ ret = vc4_rcl_msaa_surface_setup(exec, &setup.msaa_zs_write,
+ &args->msaa_zs_write);
+ if (ret)
+ return ret;
+
/* We shouldn't even have the job submitted to us if there's no
* surface to write out.
*/
- if (!setup.color_ms_write && !setup.zs_write) {
+ if (!setup.color_write && !setup.zs_write &&
+ !setup.msaa_color_write && !setup.msaa_zs_write) {
DRM_ERROR("RCL requires color or Z/S write\n");
return -EINVAL;
}
--- a/drivers/gpu/drm/vc4/vc4_validate.c
+++ b/drivers/gpu/drm/vc4/vc4_validate.c
@@ -400,9 +400,8 @@ validate_tile_binning_config(VALIDATE_AR
}
if (flags & (VC4_BIN_CONFIG_DB_NON_MS |
- VC4_BIN_CONFIG_TILE_BUFFER_64BIT |
- VC4_BIN_CONFIG_MS_MODE_4X)) {
- DRM_ERROR("unsupported bining config flags 0x%02x\n", flags);
+ VC4_BIN_CONFIG_TILE_BUFFER_64BIT)) {
+ DRM_ERROR("unsupported binning config flags 0x%02x\n", flags);
return -EINVAL;
}
--- a/include/uapi/drm/vc4_drm.h
+++ b/include/uapi/drm/vc4_drm.h
@@ -46,10 +46,13 @@ struct drm_vc4_submit_rcl_surface {
uint32_t hindex; /* Handle index, or ~0 if not present. */
uint32_t offset; /* Offset to start of buffer. */
/*
- * Bits for either render config (color_ms_write) or load/store packet.
+ * Bits for either render config (color_write) or load/store packet.
+ * Bits should all be 0 for MSAA load/stores.
*/
uint16_t bits;
- uint16_t pad;
+
+#define VC4_SUBMIT_RCL_SURFACE_READ_IS_FULL_RES (1 << 0)
+ uint16_t flags;
};
/**
@@ -128,9 +131,11 @@ struct drm_vc4_submit_cl {
uint8_t max_x_tile;
uint8_t max_y_tile;
struct drm_vc4_submit_rcl_surface color_read;
- struct drm_vc4_submit_rcl_surface color_ms_write;
+ struct drm_vc4_submit_rcl_surface color_write;
struct drm_vc4_submit_rcl_surface zs_read;
struct drm_vc4_submit_rcl_surface zs_write;
+ struct drm_vc4_submit_rcl_surface msaa_color_write;
+ struct drm_vc4_submit_rcl_surface msaa_zs_write;
uint32_t clear_color[2];
uint32_t clear_z;
uint8_t clear_s;
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