static void *
etna_transfer_map(struct pipe_context *pctx, struct pipe_resource *prsc,
unsigned level,
unsigned usage,
const struct pipe_box *box,
struct pipe_transfer **out_transfer)
{
struct etna_context *ctx = etna_context(pctx);
struct etna_resource *rsc = etna_resource(prsc);
struct etna_transfer *trans;
struct pipe_transfer *ptrans;
enum pipe_format format = prsc->format;
trans = slab_alloc(&ctx->transfer_pool);
if (!trans)
return NULL;
/* slab_alloc() doesn't zero */
memset(trans, 0, sizeof(*trans));
ptrans = &trans->base;
pipe_resource_reference(&ptrans->resource, prsc);
ptrans->level = level;
ptrans->usage = usage;
ptrans->box = *box;
assert(level <= prsc->last_level);
/* Upgrade DISCARD_RANGE to WHOLE_RESOURCE if the whole resource is
* being mapped. If we add buffer reallocation to avoid CPU/GPU sync this
* check needs to be extended to coherent mappings and shared resources.
*/
if ((usage & PIPE_TRANSFER_DISCARD_RANGE) &&
!(usage & PIPE_TRANSFER_UNSYNCHRONIZED) &&
prsc->last_level == 0 &&
prsc->width0 == box->width &&
prsc->height0 == box->height &&
prsc->depth0 == box->depth &&
prsc->array_size == 1) {
usage |= PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE;
}
if (rsc->texture && !etna_resource_newer(rsc, etna_resource(rsc->texture))) {
/* We have a texture resource which is the same age or newer than the
* render resource. Use the texture resource, which avoids bouncing
* pixels between the two resources, and we can de-tile it in s/w. */
rsc = etna_resource(rsc->texture);
} else if (rsc->ts_bo ||
(rsc->layout != ETNA_LAYOUT_LINEAR &&
util_format_get_blocksize(format) > 1 &&
/* HALIGN 4 resources are incompatible with the resolve engine,
* so fall back to using software to detile this resource. */
rsc->halign != TEXTURE_HALIGN_FOUR)) {
/* If the surface has tile status, we need to resolve it first.
* The strategy we implement here is to use the RS to copy the
* depth buffer, filling in the "holes" where the tile status
* indicates that it's clear. We also do this for tiled
* resources, but only if the RS can blit them. */
if (usage & PIPE_TRANSFER_MAP_DIRECTLY) {
slab_free(&ctx->transfer_pool, trans);
BUG("unsupported transfer flags %#x with tile status/tiled layout", usage);
return NULL;
}
if (prsc->depth0 > 1) {
slab_free(&ctx->transfer_pool, trans);
BUG("resource has depth >1 with tile status");
return NULL;
}
struct pipe_resource templ = *prsc;
templ.nr_samples = 0;
templ.bind = PIPE_BIND_RENDER_TARGET;
trans->rsc = etna_resource_alloc(pctx->screen, ETNA_LAYOUT_LINEAR,
DRM_FORMAT_MOD_LINEAR, &templ);
if (!trans->rsc) {
slab_free(&ctx->transfer_pool, trans);
return NULL;
}
/* Need to align the transfer region to satisfy RS restrictions, as we
* really want to hit the RS blit path here.
*/
unsigned w_align, h_align;
if (rsc->layout & ETNA_LAYOUT_BIT_SUPER) {
w_align = h_align = 64;
} else {
w_align = ETNA_RS_WIDTH_MASK + 1;
h_align = ETNA_RS_HEIGHT_MASK + 1;
}
h_align *= ctx->screen->specs.pixel_pipes;
ptrans->box.width += ptrans->box.x & (w_align - 1);
ptrans->box.x = ptrans->box.x & ~(w_align - 1);
ptrans->box.width = align(ptrans->box.width, (ETNA_RS_WIDTH_MASK + 1));
ptrans->box.height += ptrans->box.y & (h_align - 1);
ptrans->box.y = ptrans->box.y & ~(h_align - 1);
ptrans->box.height = align(ptrans->box.height,
(ETNA_RS_HEIGHT_MASK + 1) *
ctx->screen->specs.pixel_pipes);
if (!(usage & PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE))
etna_copy_resource_box(pctx, trans->rsc, prsc, level, &ptrans->box);
/* Switch to using the temporary resource instead */
rsc = etna_resource(trans->rsc);
}
struct etna_resource_level *res_level = &rsc->levels[level];
/*
* Always flush if we have the temporary resource and have a copy to this
* outstanding. Otherwise infer flush requirement from resource access and
* current GPU usage (reads must wait for GPU writes, writes must have
* exclusive access to the buffer).
*/
if ((trans->rsc && (etna_resource(trans->rsc)->status & ETNA_PENDING_WRITE)) ||
(!trans->rsc &&
(((usage & PIPE_TRANSFER_READ) && (rsc->status & ETNA_PENDING_WRITE)) ||
((usage & PIPE_TRANSFER_WRITE) && rsc->status))))
pctx->flush(pctx, NULL, 0);
/* XXX we don't handle PIPE_TRANSFER_FLUSH_EXPLICIT; this flag can be ignored
* when mapping in-place,
* but when not in place we need to fire off the copy operation in
* transfer_flush_region (currently
* a no-op) instead of unmap. Need to handle this to support
* ARB_map_buffer_range extension at least.
*/
/* XXX we don't take care of current operations on the resource; which can
be, at some point in the pipeline
which is not yet executed:
- bound as surface
- bound through vertex buffer
- bound through index buffer
- bound in sampler view
- used in clear_render_target / clear_depth_stencil operation
- used in blit
- used in resource_copy_region
How do other drivers record this information over course of the rendering
pipeline?
Is it necessary at all? Only in case we want to provide a fast path and
map the resource directly
(and for PIPE_TRANSFER_MAP_DIRECTLY) and we don't want to force a sync.
We also need to know whether the resource is in use to determine if a sync
is needed (or just do it
always, but that comes at the expense of performance).
A conservative approximation without too much overhead would be to mark
all resources that have
been bound at some point as busy. A drawback would be that accessing
resources that have
been bound but are no longer in use for a while still carry a performance
penalty. On the other hand,
the program could be using PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE or
PIPE_TRANSFER_UNSYNCHRONIZED to
avoid this in the first place...
A) We use an in-pipe copy engine, and queue the copy operation after unmap
so that the copy
will be performed when all current commands have been executed.
Using the RS is possible, not sure if always efficient. This can also
do any kind of tiling for us.
Only possible when PIPE_TRANSFER_DISCARD_RANGE is set.
B) We discard the entire resource (or at least, the mipmap level) and
allocate new memory for it.
Only possible when mapping the entire resource or
PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE is set.
*/
/*
* Pull resources into the CPU domain. Only skipped for unsynchronized
* transfers without a temporary resource.
*/
if (trans->rsc || !(usage & PIPE_TRANSFER_UNSYNCHRONIZED)) {
uint32_t prep_flags = 0;
if (usage & PIPE_TRANSFER_READ)
prep_flags |= DRM_ETNA_PREP_READ;
if (usage & PIPE_TRANSFER_WRITE)
prep_flags |= DRM_ETNA_PREP_WRITE;
if (etna_bo_cpu_prep(rsc->bo, prep_flags))
goto fail_prep;
}
/* map buffer object */
void *mapped = etna_bo_map(rsc->bo);
if (!mapped)
goto fail;
*out_transfer = ptrans;
if (rsc->layout == ETNA_LAYOUT_LINEAR) {
ptrans->stride = res_level->stride;
ptrans->layer_stride = res_level->layer_stride;
return mapped + res_level->offset +
etna_compute_offset(prsc->format, box, res_level->stride,
res_level->layer_stride);
} else {
unsigned divSizeX = util_format_get_blockwidth(format);
unsigned divSizeY = util_format_get_blockheight(format);
/* No direct mappings of tiled, since we need to manually
* tile/untile.
*/
if (usage & PIPE_TRANSFER_MAP_DIRECTLY)
goto fail;
mapped += res_level->offset;
ptrans->stride = align(box->width, divSizeX) * util_format_get_blocksize(format); /* row stride in bytes */
ptrans->layer_stride = align(box->height, divSizeY) * ptrans->stride;
size_t size = ptrans->layer_stride * box->depth;
trans->staging = MALLOC(size);
if (!trans->staging)
goto fail;
if (usage & PIPE_TRANSFER_READ) {
if (rsc->layout == ETNA_LAYOUT_TILED) {
etna_texture_untile(trans->staging,
mapped + ptrans->box.z * res_level->layer_stride,
ptrans->box.x, ptrans->box.y, res_level->stride,
ptrans->box.width, ptrans->box.height, ptrans->stride,
util_format_get_blocksize(rsc->base.format));
} else if (rsc->layout == ETNA_LAYOUT_LINEAR) {
util_copy_box(trans->staging, rsc->base.format, ptrans->stride,
ptrans->layer_stride, 0, 0, 0, /* dst x,y,z */
ptrans->box.width, ptrans->box.height,
ptrans->box.depth, mapped, res_level->stride,
res_level->layer_stride, ptrans->box.x,
ptrans->box.y, ptrans->box.z);
} else {
/* TODO supertiling */
BUG("unsupported tiling %i for reading", rsc->layout);
}
}
return trans->staging;
}
fail:
etna_bo_cpu_fini(rsc->bo);
fail_prep:
etna_transfer_unmap(pctx, ptrans);
return NULL;
}
static void *etna_pipe_transfer_map(struct pipe_context *pipe,
struct pipe_resource *resource,
unsigned level,
unsigned usage, /* a combination of PIPE_TRANSFER_x */
const struct pipe_box *box,
struct pipe_transfer **out_transfer)
{
struct etna_pipe_context *priv = etna_pipe_context(pipe);
struct etna_transfer *ptrans = util_slab_alloc(&priv->transfer_pool);
struct etna_resource *resource_priv = etna_resource(resource);
enum pipe_format format = resource->format;
if (!ptrans)
return NULL;
assert(level <= resource->last_level);
/* PIPE_TRANSFER_READ always requires a sync. */
if(usage & PIPE_TRANSFER_READ)
{
etna_finish(priv->ctx);
}
/* XXX we don't handle PIPE_TRANSFER_FLUSH_EXPLICIT; this flag can be ignored when mapping in-place,
* but when not in place we need to fire off the copy operation in transfer_flush_region (currently
* a no-op) instead of unmap. Need to handle this to support ARB_map_buffer_range extension at least.
*/
/* XXX we don't take care of current operations on the resource; which can be, at some point in the pipeline
which is not yet executed:
- bound as surface
- bound through vertex buffer
- bound through index buffer
- bound in sampler view
- used in clear_render_target / clear_depth_stencil operation
- used in blit
- used in resource_copy_region
How do other drivers record this information over course of the rendering pipeline?
Is it necessary at all? Only in case we want to provide a fast path and map the resource directly
(and for PIPE_TRANSFER_MAP_DIRECTLY) and we don't want to force a sync.
We also need to know whether the resource is in use to determine if a sync is needed (or just do it
always, but that comes at the expense of performance).
A conservative approximation without too much overhead would be to mark all resources that have
been bound at some point as busy. A drawback would be that accessing resources that have
been bound but are no longer in use for a while still carry a performance penalty. On the other hand,
the program could be using PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE or PIPE_TRANSFER_UNSYNCHRONIZED to
avoid this in the first place...
A) We use an in-pipe copy engine, and queue the copy operation after unmap so that the copy
will be performed when all current commands have been executed.
Using the RS is possible, not sure if always efficient. This can also do any kind of tiling for us.
Only possible when PIPE_TRANSFER_DISCARD_RANGE is set.
B) We discard the entire resource (or at least, the mipmap level) and allocate new memory for it.
Only possible when mapping the entire resource or PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE is set.
*/
/* No need to allocate a buffer for copying if the resource is not in use,
* and no tiling is needed, can just return a direct pointer.
*/
ptrans->in_place = resource_priv->layout == ETNA_LAYOUT_LINEAR ||
(resource_priv->layout == ETNA_LAYOUT_TILED && util_format_is_compressed(resource->format));
ptrans->base.resource = resource;
ptrans->base.level = level;
ptrans->base.usage = usage;
ptrans->base.box = *box;
struct etna_resource_level *res_level = &resource_priv->levels[level];
/* map buffer object */
void *mapped = etna_bo_map(resource_priv->bo) + res_level->offset;
if(likely(ptrans->in_place))
{
ptrans->base.stride = res_level->stride;
ptrans->base.layer_stride = res_level->layer_stride;
ptrans->buffer = mapped + etna_compute_offset(resource->format, box, res_level->stride, res_level->layer_stride);
} else {
unsigned divSizeX = util_format_get_blockwidth(format);
unsigned divSizeY = util_format_get_blockheight(format);
if(usage & PIPE_TRANSFER_MAP_DIRECTLY)
{
/* No in-place transfer possible */
util_slab_free(&priv->transfer_pool, ptrans);
return NULL;
}
ptrans->base.stride = align(box->width, divSizeX) * util_format_get_blocksize(format); /* row stride in bytes */
ptrans->base.layer_stride = align(box->height, divSizeY) * ptrans->base.stride;
size_t size = ptrans->base.layer_stride * box->depth;
ptrans->buffer = MALLOC(size);
if(usage & PIPE_TRANSFER_READ)
{
/* untile or copy resource for reading */
if(resource_priv->layout == ETNA_LAYOUT_LINEAR || resource_priv->layout == ETNA_LAYOUT_TILED)
{
if(resource_priv->layout == ETNA_LAYOUT_TILED && !util_format_is_compressed(resource_priv->base.format))
{
etna_texture_untile(ptrans->buffer, mapped + ptrans->base.box.z * res_level->layer_stride,
ptrans->base.box.x, ptrans->base.box.y, res_level->stride,
ptrans->base.box.width, ptrans->base.box.height, ptrans->base.stride,
util_format_get_blocksize(resource_priv->base.format));
} else { /* non-tiled or compressed format */
util_copy_box(ptrans->buffer,
resource_priv->base.format,
ptrans->base.stride, ptrans->base.layer_stride,
0, 0, 0, /* dst x,y,z */
ptrans->base.box.width, ptrans->base.box.height, ptrans->base.box.depth,
mapped,
res_level->stride, res_level->layer_stride,
ptrans->base.box.x, ptrans->base.box.y, ptrans->base.box.z);
}
} else /* TODO supertiling */
{
BUG("unsupported tiling %i for reading", resource_priv->layout);
}
}
}
*out_transfer = &ptrans->base;
return ptrans->buffer;
}