On 28.03.2017 21:46, Marek Olšák wrote:
On Tue, Mar 28, 2017 at 11:11 AM, Nicolai Hähnle <nhaeh...@gmail.com> wrote:
From: Nicolai Hähnle <nicolai.haeh...@amd.com>
TODO fill out caps in all drivers
v2:
- explain the resource_commit interface in more detail
---
src/gallium/docs/source/context.rst | 25 +++++++++++++++++++++++++
src/gallium/docs/source/screen.rst | 3 +++
src/gallium/include/pipe/p_context.h | 13 +++++++++++++
src/gallium/include/pipe/p_defines.h | 2 ++
4 files changed, 43 insertions(+)
diff --git a/src/gallium/docs/source/context.rst
b/src/gallium/docs/source/context.rst
index a053193..5949ff2 100644
--- a/src/gallium/docs/source/context.rst
+++ b/src/gallium/docs/source/context.rst
@@ -611,20 +611,45 @@ for both regular textures as well as for framebuffers
read via FBFETCH.
.. _memory_barrier:
memory_barrier
%%%%%%%%%%%%%%%
This function flushes caches according to which of the PIPE_BARRIER_* flags
are set.
+.. _resource_commit:
+
+resource_commit
+%%%%%%%%%%%%%%%
+
+This function changes the commit state of a part of a sparse resource. Sparse
+resources are created by setting the ``PIPE_RESOURCE_FLAG_SPARSE`` flag when
+calling ``resource_create``. Initially, sparse resources only reserve a virtual
+memory region that is not backed by memory (i.e., it is uncommitted). The
+``resource_commit`` function can be called to commit or uncommit parts (or all)
+of a resource. The driver manages the underlying backing memory.
+
+The contents of newly committed memory regions are undefined. Calling this
+function to commit an already committed memory region is allowed and leaves its
+content unchanged. Similarly, calling this function to uncommit an already
+uncommitted memory region is allowed.
+
+For buffers, the given box must be aligned to multiples of
+``PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE``. As an exception to this rule, if the size
+of the buffer is not a multiple of the page size, changing the commit state of
+the last (partial) page requires a box that ends at the end of the buffer
+(i.e., box->x + box->width == buffer->width0).
+
+
+
.. _pipe_transfer:
PIPE_TRANSFER
^^^^^^^^^^^^^
These flags control the behavior of a transfer object.
``PIPE_TRANSFER_READ``
Resource contents read back (or accessed directly) at transfer create time.
diff --git a/src/gallium/docs/source/screen.rst
b/src/gallium/docs/source/screen.rst
index 00c9503..8759639 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -369,20 +369,23 @@ The integer capabilities:
opcode to retrieve the current value in the framebuffer.
* ``PIPE_CAP_TGSI_MUL_ZERO_WINS``: Whether TGSI shaders support the
``TGSI_PROPERTY_MUL_ZERO_WINS`` shader property.
* ``PIPE_CAP_DOUBLES``: Whether double precision floating-point operations
are supported.
* ``PIPE_CAP_INT64``: Whether 64-bit integer operations are supported.
* ``PIPE_CAP_INT64_DIVMOD``: Whether 64-bit integer division/modulo
operations are supported.
* ``PIPE_CAP_TGSI_TEX_TXF_LZ``: Whether TEX_LZ and TXF_LZ opcodes are
supported.
+* ``PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE``: The page size of sparse buffers in
+ bytes, or 0 if sparse buffers are not supported. The page size must be at
+ most 64KB.
.. _pipe_capf:
PIPE_CAPF_*
^^^^^^^^^^^^^^^^
The floating-point capabilities are:
* ``PIPE_CAPF_MAX_LINE_WIDTH``: The maximum width of a regular line.
diff --git a/src/gallium/include/pipe/p_context.h
b/src/gallium/include/pipe/p_context.h
index a29fff5..4d5535b 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -578,20 +578,33 @@ struct pipe_context {
* Flush any pending framebuffer writes and invalidate texture caches.
*/
void (*texture_barrier)(struct pipe_context *, unsigned flags);
/**
* Flush caches according to flags.
*/
void (*memory_barrier)(struct pipe_context *, unsigned flags);
/**
+ * Change the commitment status of a part of the given resource, which must
+ * have been created with the PIPE_RESOURCE_FLAG_SPARSE bit.
+ *
+ * \param level The texture level whose commitment should be changed.
+ * \param box The region of the resource whose commitment should be changed.
+ * \param commit Whether memory should be committed or un-committed.
+ *
+ * \return false if out of memory, true on success.
+ */
+ bool (*resource_commit)(struct pipe_context *, struct pipe_resource *,
+ unsigned level, struct pipe_box *box, bool commit);
I wonder what the behavior for threaded gallium should be. Possibilities:
1) Sync the context thread and execute directly.
2) Ignore the return value, always return true, and execute it asynchronously.
If the "false" return value is very unlikely, I may use the second approach.
"false" here means out-of-memory, or some error returned by the kernel
on the map operations (which in practice also should always be
out-of-memory...). What's the story here for threaded gallium? We're not
exactly consistent in reporting out-of-memory errors anyway (on draw
calls especially), but maybe that's something to improve...
Cheers,
Nicolai
Marek
--
Lerne, wie die Welt wirklich ist,
Aber vergiss niemals, wie sie sein sollte.
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