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b02486ff87
Extends wsialloc_alloc to return whether or not the allocation will be disjoint. Groups wsialloc_alloc's return values to a struct. Change-Id: I7542e37d8af16ce7989ab235c02305d562f3c667 Signed-off-by: Iason Paraskevopoulos <iason.paraskevopoulos@arm.com>
253 lines
11 KiB
C
253 lines
11 KiB
C
/*
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* Copyright (c) 2017-2024 Arm Limited.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/**
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* @file
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* Window System Integration (WSI) Buffer Allocation Interface
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*/
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#ifndef _WSIALLOC_H_
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#define _WSIALLOC_H_
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#include <stdint.h>
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#include <stdbool.h>
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wpedantic"
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#include <drm_fourcc.h>
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#pragma GCC diagnostic pop
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* @page wsialloc_page Window System Integration (WSI) Buffer Allocation
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*
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* wsialloc is a standalone module for doing window system/platform agnostic multi-plane buffer allocation.
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*
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* The underlying implementation will allocate sufficient space for the desired buffer format in a way that is
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* compatible with the window system and the GPU (e.g. accounting for buffer row-start alignment requirements).
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*
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* @note The bare minimum work is done to provide the buffer. For example, it is up to the client to initialize the data
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* if that is required for the desired buffer format.
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*
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* The underlying allocator implementation is chosen at compile time.
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*
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* All API Public entry points are implemented in a way that is thread safe, and the client does not need to be
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* concerned with locking when using these APIs. If implementers make use of non-threadsafe functions, writable global
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* data etc they must make appropriate use of locks.
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*
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* Version History:
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* 1 - Initial wsialloc interface
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* 2 - Added WSIALLOC_ALLOCATE_HIGHEST_FIXED_RATE_COMPRESSION
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* 3 - Grouped the return values of wsialloc_alloc to wsialloc_allocate_result and added another value for returning
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* whether or not the allocation will be disjoint.
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*/
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#define WSIALLOC_INTERFACE_VERSION 3
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#define WSIALLOC_CONCAT(x, y) x##y
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#define WSIALLOC_SYMBOL_VERSION(symbol, version) WSIALLOC_CONCAT(symbol, version)
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/**
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* @brief This symbol must be defined by any implementation of the wsialloc interface as defined in this header.
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*
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* A wsialloc implementation defining this symbol is declaring it implements
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* the exact version of the wsialloc interface defined in this header.
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*/
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#define WSIALLOC_IMPLEMENTATION_VERSION_SYMBOL \
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WSIALLOC_SYMBOL_VERSION(wsialloc_symbol_version_, WSIALLOC_INTERFACE_VERSION)
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extern const uint32_t WSIALLOC_IMPLEMENTATION_VERSION_SYMBOL;
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/**
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* @brief Aborts if the wsialloc implementation version is not the expected one.
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*
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* This macro calls abort() if the version of the wsialloc implementation that was linked to the code using this
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* macro is not matching the version defined in the wsialloc.h header that is being included. This can be useful
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* to catch compatibility issues in code that links to an external static library implementing the wsialloc
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* interface.
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*/
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#define WSIALLOC_ASSERT_VERSION() \
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if (WSIALLOC_IMPLEMENTATION_VERSION_SYMBOL != WSIALLOC_INTERFACE_VERSION) \
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{ \
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abort(); \
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}
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/* Maximum number of planes that can be returned */
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#define WSIALLOC_MAX_PLANES 4
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/**
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* @brief Allocator type.
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*
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* Represents a private allocator structure.
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*/
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typedef struct wsialloc_allocator wsialloc_allocator;
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typedef enum wsialloc_error
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{
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WSIALLOC_ERROR_NONE = 0,
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WSIALLOC_ERROR_INVALID = -1,
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WSIALLOC_ERROR_NOT_SUPPORTED = -2,
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WSIALLOC_ERROR_NO_RESOURCE = -3,
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} wsialloc_error;
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/**
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* @brief Allocate and initialize a new WSI Allocator from an existing file descriptor.
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*
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* The allocator from the function is used in subsequent calls to wsialloc_alloc() to allocate new buffers.
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*
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* @param[out] allocator a valid allocator for use in wsialloc functions.
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*
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* @retval WSIALLOC_ERROR_NONE on successful allocator creation.
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* @retval WSIALLOC_ERROR_FAILED on failed allocator creation.
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*/
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wsialloc_error wsialloc_new(wsialloc_allocator **allocator);
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/**
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* @brief Close down and free resources associated with a WSI Allocator
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*
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* It is acceptable for buffer allocations from @p allocator to still exist and be in use. In this case, this function
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* will return without waiting for the client to free the other allocations. However, the actual closing down and
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* freeing of @p allocator will be deferred until the last allocation has been closed by the client.
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*
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* @note For the implementer: there is usually no need to track this explicitly, since kernel side allocators
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* automatically defer their closing until all their allocations are also freed.
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*
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* @post no more new allocations should be made on @p allocator even if previous allocations still exist.
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*
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* @param allocator The allocator to close down and free.
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*/
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void wsialloc_delete(wsialloc_allocator *allocator);
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enum wsialloc_format_flag
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{
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/** The format requires a memory allocation with the same file descriptor for all planes. */
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WSIALLOC_FORMAT_NON_DISJOINT = 0x1,
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};
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enum wsialloc_allocate_flag
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{
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/** Allocates the buffer in protected memory. */
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WSIALLOC_ALLOCATE_PROTECTED = 0x1,
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/** Performs allocation calculations and format selection without allocating any memory. */
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WSIALLOC_ALLOCATE_NO_MEMORY = 0x2,
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/** Sets a preference for selecting the format with the highest fixed compression rate. */
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WSIALLOC_ALLOCATE_HIGHEST_FIXED_RATE_COMPRESSION = 0x4,
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};
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typedef struct wsialloc_format
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{
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uint32_t fourcc; /**< The DRM_FORMAT_<...> code */
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uint64_t modifier; /**< DRM modifier applied to all planes. */
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uint64_t flags; /**< Set of @r wsialloc_format_flag format flags. */
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} wsialloc_format;
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typedef struct wsialloc_allocate_info
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{
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wsialloc_format *formats; /** List of formats to select from for the allocation. */
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unsigned format_count; /** Number of elements in formats array. */
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uint32_t width; /** The number of pixel columns required in the buffer. */
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uint32_t height; /** The number of pixel rows required in the buffer. */
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uint64_t flags; /** Set of @r wsialloc_allocate_flag allocation flags. */
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} wsialloc_allocate_info;
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typedef struct wsialloc_allocate_result
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{
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wsialloc_format format; /** The selected format for allocation. */
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/** Per plane distance between rows of blocks divided by the block height measured in bytes. */
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int average_row_strides[WSIALLOC_MAX_PLANES];
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/** Per plane offset into the file descriptor for the start of the plane. */
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uint32_t offsets[WSIALLOC_MAX_PLANES];
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int buffer_fds[WSIALLOC_MAX_PLANES]; /** Per plane file descriptor for the buffer. */
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bool is_disjoint; /** Whether different fds will be used for each plane. */
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} wsialloc_allocate_result;
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/**
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* @brief Allocate a buffer from the WSI Allocator
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*
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* Allocate a buffer of size @p info::width x @p info::height in a way that is suitable for the underlying
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* window system and GPU.
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*
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* The allocation is made using a format from the list specified in @p info::formats . On success, @p result::format is set with
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* the selected format that was used for the allocation.
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*
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* Each plane is returned as a file descriptor. All other information returned about the buffer is also per-plane. It is
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* assumed the caller already knows how many planes are implied by the @p result::format that was selected.
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*
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* Each row in the buffer may be larger than @p info::width to account for buffer alignment requirements in the
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* underlying window system. @p result::average_row_strides must be examined to determine the number of bytes between
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* subsequent rows in each of the buffer's planes. Only positive average_row_strides are allowed.
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*
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* The client may free the buffer's planes by invoking close() on some or all of the elements of @p result::buffer_fds
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*
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* The same file descriptor ('fd') may be written to different elements of @p result::buffer_fds more than once, for some or all
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* of the planes. In this case:
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* - @p result::offsets @b must be used to determine where each plane starts in the file descriptor
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* - When the client frees the buffer, each unique fd in @p result::buffer_fds must only be closed once.
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*
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* Even if @p result::buffer_fds are all different or @p result::format is for a single plane, then the client must inspect
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* @p result::offsets in case it contains non-zero values.
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*
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* If @p result::buffer_fds are different then @p result::disjoint should be set to true.
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*
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* @note The implementation might not export the file descriptors in @p result::buffer_fds in such a way that allows the client
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* to directly map them on the CPU as writable (PROT_WRITE).
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*
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* The selected @p result::format modifier allows for a fourcc_mod_code() (as defined in drm_fourcc.h) to define
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* a reordering or other modification of the data in the buffer's planes (e.g. compression,
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* change in number of planes, etc).
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*
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* @p result::average_row_strides are per plane row average byte strides of the @p result::format. This is the number of bytes from the
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* start of a row of blocks divided by the block height. It may also have format specific meaning for formats not in those
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* categories.
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*
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* @p result::average_row_strides and @p result::offsets may have modifier-specific
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* meaning when a @p result::format with modifier is selected.
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*
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* @pre @p result::average_row_strides, @p result::buffer_fds, @p result::offsets
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* are pointers to storage large enough to hold per-plane information.
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* @pre @p info::width >=1 && @p info::height >= 1
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* @pre @p allocator is a currently valid WSI Allocator from wsialloc_new()
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* @post The allocated buffer will be zeroed.
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*
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* @param allocator The WSI Allocator to allocate from.
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* @param[in] info The requested allocation information.
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* @param[out] result The allocation's result.
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* @retval WSIALLOC_ERROR_NONE on successful buffer allocation.
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* @retval WSIALLOC_ERROR_INVALID is returned for invalid parameters.
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* @retval WSIALLOC_ERROR_NOT_SUPPORTED is returned for unsupported parameters, such as a modifier or recognized
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* format not supported by the underlying window-system/allocator.
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* @retval WSIALLOC_ERROR_NO_RESOURCE is returned on failed buffer allocation due to lack of available memory or other
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* system resources.
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*/
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wsialloc_error wsialloc_alloc(wsialloc_allocator *allocator, const wsialloc_allocate_info *info,
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wsialloc_allocate_result *result);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* _WSIALLOC_H_ */
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