blob: c22a9a9302ac22666341b8f623367ecac9d3aa4a [file] [log] [blame]
/*
* Copyright 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifdef DRV_TEGRA
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <tegra_drm.h>
#include <xf86drm.h>
#include "drv_priv.h"
#include "helpers.h"
#include "util.h"
/*
* GOB (Group Of Bytes) is the basic unit of the blocklinear layout.
* GOBs are arranged to blocks, where the height of the block (measured
* in GOBs) is configurable.
*/
#define NV_BLOCKLINEAR_GOB_HEIGHT 8
#define NV_BLOCKLINEAR_GOB_WIDTH 64
#define NV_DEFAULT_BLOCK_HEIGHT_LOG2 4
#define NV_PREFERRED_PAGE_SIZE (128 * 1024)
// clang-format off
enum nv_mem_kind
{
NV_MEM_KIND_PITCH = 0,
NV_MEM_KIND_C32_2CRA = 0xdb,
NV_MEM_KIND_GENERIC_16Bx2 = 0xfe,
};
enum tegra_map_type {
TEGRA_READ_TILED_BUFFER = 0,
TEGRA_WRITE_TILED_BUFFER = 1,
};
// clang-format on
struct tegra_private_map_data {
void *tiled;
void *untiled;
};
static const uint32_t render_target_formats[] = { DRM_FORMAT_ARGB8888, DRM_FORMAT_XRGB8888 };
static int compute_block_height_log2(int height)
{
int block_height_log2 = NV_DEFAULT_BLOCK_HEIGHT_LOG2;
if (block_height_log2 > 0) {
/* Shrink, if a smaller block height could cover the whole
* surface height. */
int proposed = NV_BLOCKLINEAR_GOB_HEIGHT << (block_height_log2 - 1);
while (proposed >= height) {
block_height_log2--;
if (block_height_log2 == 0)
break;
proposed /= 2;
}
}
return block_height_log2;
}
static void compute_layout_blocklinear(int width, int height, int format, enum nv_mem_kind *kind,
uint32_t *block_height_log2, uint32_t *stride,
uint32_t *size)
{
int pitch = drv_stride_from_format(format, width, 0);
/* Align to blocklinear blocks. */
pitch = ALIGN(pitch, NV_BLOCKLINEAR_GOB_WIDTH);
/* Compute padded height. */
*block_height_log2 = compute_block_height_log2(height);
int block_height = 1 << *block_height_log2;
int padded_height = ALIGN(height, NV_BLOCKLINEAR_GOB_HEIGHT * block_height);
int bytes = pitch * padded_height;
/* Pad the allocation to the preferred page size.
* This will reduce the required page table size (see discussion in NV
* bug 1321091), and also acts as a WAR for NV bug 1325421.
*/
bytes = ALIGN(bytes, NV_PREFERRED_PAGE_SIZE);
*kind = NV_MEM_KIND_C32_2CRA;
*stride = pitch;
*size = bytes;
}
static void compute_layout_linear(int width, int height, int format, uint32_t *stride,
uint32_t *size)
{
*stride = ALIGN(drv_stride_from_format(format, width, 0), 64);
*size = *stride * height;
}
static void transfer_tile(struct bo *bo, uint8_t *tiled, uint8_t *untiled, enum tegra_map_type type,
uint32_t bytes_per_pixel, uint32_t gob_top, uint32_t gob_left,
uint32_t gob_size_pixels, uint8_t *tiled_last)
{
uint8_t *tmp;
uint32_t x, y, k;
for (k = 0; k < gob_size_pixels; k++) {
/*
* Given the kth pixel starting from the tile specified by
* gob_top and gob_left, unswizzle to get the standard (x, y)
* representation.
*/
x = gob_left + (((k >> 3) & 8) | ((k >> 1) & 4) | (k & 3));
y = gob_top + ((k >> 7 << 3) | ((k >> 3) & 6) | ((k >> 2) & 1));
if (tiled >= tiled_last)
return;
if (x >= bo->meta.width || y >= bo->meta.height) {
tiled += bytes_per_pixel;
continue;
}
tmp = untiled + y * bo->meta.strides[0] + x * bytes_per_pixel;
if (type == TEGRA_READ_TILED_BUFFER)
memcpy(tmp, tiled, bytes_per_pixel);
else if (type == TEGRA_WRITE_TILED_BUFFER)
memcpy(tiled, tmp, bytes_per_pixel);
/* Move on to next pixel. */
tiled += bytes_per_pixel;
}
}
static void transfer_tiled_memory(struct bo *bo, uint8_t *tiled, uint8_t *untiled,
enum tegra_map_type type)
{
uint32_t gob_width, gob_height, gob_size_bytes, gob_size_pixels, gob_count_x, gob_count_y,
gob_top, gob_left;
uint32_t i, j, offset;
uint8_t *tmp, *tiled_last;
uint32_t bytes_per_pixel = drv_stride_from_format(bo->meta.format, 1, 0);
/*
* The blocklinear format consists of 8*(2^n) x 64 byte sized tiles,
* where 0 <= n <= 4.
*/
gob_width = DIV_ROUND_UP(NV_BLOCKLINEAR_GOB_WIDTH, bytes_per_pixel);
gob_height = NV_BLOCKLINEAR_GOB_HEIGHT * (1 << NV_DEFAULT_BLOCK_HEIGHT_LOG2);
/* Calculate the height from maximum possible gob height */
while (gob_height > NV_BLOCKLINEAR_GOB_HEIGHT && gob_height >= 2 * bo->meta.height)
gob_height /= 2;
gob_size_bytes = gob_height * NV_BLOCKLINEAR_GOB_WIDTH;
gob_size_pixels = gob_height * gob_width;
gob_count_x = DIV_ROUND_UP(bo->meta.strides[0], NV_BLOCKLINEAR_GOB_WIDTH);
gob_count_y = DIV_ROUND_UP(bo->meta.height, gob_height);
tiled_last = tiled + bo->meta.total_size;
offset = 0;
for (j = 0; j < gob_count_y; j++) {
gob_top = j * gob_height;
for (i = 0; i < gob_count_x; i++) {
tmp = tiled + offset;
gob_left = i * gob_width;
transfer_tile(bo, tmp, untiled, type, bytes_per_pixel, gob_top, gob_left,
gob_size_pixels, tiled_last);
offset += gob_size_bytes;
}
}
}
static int tegra_init(struct driver *drv)
{
struct format_metadata metadata;
uint64_t use_flags = BO_USE_RENDER_MASK;
metadata.tiling = NV_MEM_KIND_PITCH;
metadata.priority = 1;
metadata.modifier = DRM_FORMAT_MOD_LINEAR;
drv_add_combinations(drv, render_target_formats, ARRAY_SIZE(render_target_formats),
&metadata, use_flags);
drv_modify_combination(drv, DRM_FORMAT_XRGB8888, &metadata, BO_USE_CURSOR | BO_USE_SCANOUT);
drv_modify_combination(drv, DRM_FORMAT_ARGB8888, &metadata, BO_USE_CURSOR | BO_USE_SCANOUT);
use_flags &= ~BO_USE_SW_WRITE_OFTEN;
use_flags &= ~BO_USE_SW_READ_OFTEN;
use_flags &= ~BO_USE_LINEAR;
metadata.tiling = NV_MEM_KIND_C32_2CRA;
metadata.priority = 2;
drv_add_combinations(drv, render_target_formats, ARRAY_SIZE(render_target_formats),
&metadata, use_flags);
drv_modify_combination(drv, DRM_FORMAT_XRGB8888, &metadata, BO_USE_SCANOUT);
drv_modify_combination(drv, DRM_FORMAT_ARGB8888, &metadata, BO_USE_SCANOUT);
return 0;
}
static int tegra_bo_create(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
uint64_t use_flags)
{
uint32_t size, stride, block_height_log2 = 0;
enum nv_mem_kind kind = NV_MEM_KIND_PITCH;
struct drm_tegra_gem_create gem_create = { 0 };
int ret;
if (use_flags &
(BO_USE_CURSOR | BO_USE_LINEAR | BO_USE_SW_READ_OFTEN | BO_USE_SW_WRITE_OFTEN))
compute_layout_linear(width, height, format, &stride, &size);
else
compute_layout_blocklinear(width, height, format, &kind, &block_height_log2,
&stride, &size);
gem_create.size = size;
gem_create.flags = 0;
ret = drmIoctl(bo->drv->fd, DRM_IOCTL_TEGRA_GEM_CREATE, &gem_create);
if (ret) {
drv_log("DRM_IOCTL_TEGRA_GEM_CREATE failed (size=%zu)\n", size);
return -errno;
}
bo->handles[0].u32 = gem_create.handle;
bo->meta.offsets[0] = 0;
bo->meta.total_size = bo->meta.sizes[0] = size;
bo->meta.strides[0] = stride;
if (kind != NV_MEM_KIND_PITCH) {
struct drm_tegra_gem_set_tiling gem_tile = { 0 };
gem_tile.handle = bo->handles[0].u32;
gem_tile.mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK;
gem_tile.value = block_height_log2;
ret = drmCommandWriteRead(bo->drv->fd, DRM_TEGRA_GEM_SET_TILING, &gem_tile,
sizeof(gem_tile));
if (ret < 0) {
drv_gem_bo_destroy(bo);
return ret;
}
/* Encode blocklinear parameters for EGLImage creation. */
bo->meta.tiling = (kind & 0xff) | ((block_height_log2 & 0xf) << 8);
bo->meta.format_modifiers[0] = fourcc_mod_code(NV, bo->meta.tiling);
}
return 0;
}
static int tegra_bo_import(struct bo *bo, struct drv_import_fd_data *data)
{
int ret;
struct drm_tegra_gem_get_tiling gem_get_tiling = { 0 };
ret = drv_prime_bo_import(bo, data);
if (ret)
return ret;
/* TODO(gsingh): export modifiers and get rid of backdoor tiling. */
gem_get_tiling.handle = bo->handles[0].u32;
ret = drmIoctl(bo->drv->fd, DRM_IOCTL_TEGRA_GEM_GET_TILING, &gem_get_tiling);
if (ret) {
drv_gem_bo_destroy(bo);
return -errno;
}
/* NOTE(djmk): we only know about one tiled format, so if our drmIoctl call tells us we are
tiled, assume it is this format (NV_MEM_KIND_C32_2CRA) otherwise linear (KIND_PITCH). */
if (gem_get_tiling.mode == DRM_TEGRA_GEM_TILING_MODE_PITCH) {
bo->meta.tiling = NV_MEM_KIND_PITCH;
} else if (gem_get_tiling.mode == DRM_TEGRA_GEM_TILING_MODE_BLOCK) {
bo->meta.tiling = NV_MEM_KIND_C32_2CRA;
} else {
drv_log("%s: unknown tile format %d\n", __func__, gem_get_tiling.mode);
drv_gem_bo_destroy(bo);
assert(0);
}
bo->meta.format_modifiers[0] = fourcc_mod_code(NV, bo->meta.tiling);
return 0;
}
static void *tegra_bo_map(struct bo *bo, struct vma *vma, size_t plane, uint32_t map_flags)
{
int ret;
struct drm_tegra_gem_mmap gem_map = { 0 };
struct tegra_private_map_data *priv;
gem_map.handle = bo->handles[0].u32;
ret = drmCommandWriteRead(bo->drv->fd, DRM_TEGRA_GEM_MMAP, &gem_map, sizeof(gem_map));
if (ret < 0) {
drv_log("DRM_TEGRA_GEM_MMAP failed\n");
return MAP_FAILED;
}
void *addr = mmap(0, bo->meta.total_size, drv_get_prot(map_flags), MAP_SHARED, bo->drv->fd,
gem_map.offset);
vma->length = bo->meta.total_size;
if ((bo->meta.tiling & 0xFF) == NV_MEM_KIND_C32_2CRA && addr != MAP_FAILED) {
priv = calloc(1, sizeof(*priv));
priv->untiled = calloc(1, bo->meta.total_size);
priv->tiled = addr;
vma->priv = priv;
transfer_tiled_memory(bo, priv->tiled, priv->untiled, TEGRA_READ_TILED_BUFFER);
addr = priv->untiled;
}
return addr;
}
static int tegra_bo_unmap(struct bo *bo, struct vma *vma)
{
if (vma->priv) {
struct tegra_private_map_data *priv = vma->priv;
vma->addr = priv->tiled;
free(priv->untiled);
free(priv);
vma->priv = NULL;
}
return munmap(vma->addr, vma->length);
}
static int tegra_bo_flush(struct bo *bo, struct mapping *mapping)
{
struct tegra_private_map_data *priv = mapping->vma->priv;
if (priv && (mapping->vma->map_flags & BO_MAP_WRITE))
transfer_tiled_memory(bo, priv->tiled, priv->untiled, TEGRA_WRITE_TILED_BUFFER);
return 0;
}
const struct backend backend_tegra = {
.name = "tegra",
.init = tegra_init,
.bo_create = tegra_bo_create,
.bo_destroy = drv_gem_bo_destroy,
.bo_import = tegra_bo_import,
.bo_map = tegra_bo_map,
.bo_unmap = tegra_bo_unmap,
.bo_flush = tegra_bo_flush,
};
#endif