331 lines
10 KiB
C
331 lines
10 KiB
C
/*
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* TILER container manager specification and support functions for TI
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* TILER driver.
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*
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* Author: Lajos Molnar <molnar@ti.com>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of Texas Instruments Incorporated nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TCM_H
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#define TCM_H
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struct tcm;
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/* point */
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struct tcm_pt {
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u16 x;
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u16 y;
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};
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/* 1d or 2d area */
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struct tcm_area {
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bool is2d; /* whether area is 1d or 2d */
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struct tcm *tcm; /* parent */
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struct tcm_pt p0;
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struct tcm_pt p1;
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};
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struct tcm {
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u16 width, height; /* container dimensions */
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int lut_id; /* Lookup table identifier */
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unsigned int y_offset; /* offset to use for y coordinates */
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spinlock_t lock;
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unsigned long *bitmap;
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size_t map_size;
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/* function table */
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s32 (*reserve_2d)(struct tcm *tcm, u16 height, u16 width, u16 align,
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s16 offset, u16 slot_bytes,
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struct tcm_area *area);
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s32 (*reserve_1d)(struct tcm *tcm, u32 slots, struct tcm_area *area);
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s32 (*free)(struct tcm *tcm, struct tcm_area *area);
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void (*deinit)(struct tcm *tcm);
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};
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/*=============================================================================
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BASIC TILER CONTAINER MANAGER INTERFACE
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=============================================================================*/
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/*
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* NOTE:
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*
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* Since some basic parameter checking is done outside the TCM algorithms,
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* TCM implementation do NOT have to check the following:
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*
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* area pointer is NULL
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* width and height fits within container
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* number of pages is more than the size of the container
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*
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*/
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struct tcm *sita_init(u16 width, u16 height);
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/**
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* Deinitialize tiler container manager.
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*
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* @param tcm Pointer to container manager.
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*
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* @return 0 on success, non-0 error value on error. The call
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* should free as much memory as possible and meaningful
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* even on failure. Some error codes: -ENODEV: invalid
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* manager.
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*/
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static inline void tcm_deinit(struct tcm *tcm)
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{
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if (tcm)
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tcm->deinit(tcm);
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}
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/**
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* Reserves a 2D area in the container.
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*
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* @param tcm Pointer to container manager.
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* @param height Height(in pages) of area to be reserved.
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* @param width Width(in pages) of area to be reserved.
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* @param align Alignment requirement for top-left corner of area. Not
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* all values may be supported by the container manager,
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* but it must support 0 (1), 32 and 64.
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* 0 value is equivalent to 1.
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* @param offset Offset requirement, in bytes. This is the offset
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* from a 4KiB aligned virtual address.
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* @param slot_bytes Width of slot in bytes
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* @param area Pointer to where the reserved area should be stored.
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*
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* @return 0 on success. Non-0 error code on failure. Also,
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* the tcm field of the area will be set to NULL on
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* failure. Some error codes: -ENODEV: invalid manager,
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* -EINVAL: invalid area, -ENOMEM: not enough space for
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* allocation.
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*/
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static inline s32 tcm_reserve_2d(struct tcm *tcm, u16 width, u16 height,
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u16 align, s16 offset, u16 slot_bytes,
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struct tcm_area *area)
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{
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/* perform rudimentary error checking */
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s32 res = tcm == NULL ? -ENODEV :
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(area == NULL || width == 0 || height == 0 ||
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/* align must be a 2 power */
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(align & (align - 1))) ? -EINVAL :
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(height > tcm->height || width > tcm->width) ? -ENOMEM : 0;
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if (!res) {
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area->is2d = true;
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res = tcm->reserve_2d(tcm, height, width, align, offset,
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slot_bytes, area);
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area->tcm = res ? NULL : tcm;
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}
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return res;
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}
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/**
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* Reserves a 1D area in the container.
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*
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* @param tcm Pointer to container manager.
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* @param slots Number of (contiguous) slots to reserve.
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* @param area Pointer to where the reserved area should be stored.
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*
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* @return 0 on success. Non-0 error code on failure. Also,
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* the tcm field of the area will be set to NULL on
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* failure. Some error codes: -ENODEV: invalid manager,
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* -EINVAL: invalid area, -ENOMEM: not enough space for
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* allocation.
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*/
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static inline s32 tcm_reserve_1d(struct tcm *tcm, u32 slots,
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struct tcm_area *area)
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{
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/* perform rudimentary error checking */
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s32 res = tcm == NULL ? -ENODEV :
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(area == NULL || slots == 0) ? -EINVAL :
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slots > (tcm->width * (u32) tcm->height) ? -ENOMEM : 0;
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if (!res) {
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area->is2d = false;
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res = tcm->reserve_1d(tcm, slots, area);
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area->tcm = res ? NULL : tcm;
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}
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return res;
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}
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/**
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* Free a previously reserved area from the container.
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*
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* @param area Pointer to area reserved by a prior call to
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* tcm_reserve_1d or tcm_reserve_2d call, whether
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* it was successful or not. (Note: all fields of
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* the structure must match.)
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*
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* @return 0 on success. Non-0 error code on failure. Also, the tcm
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* field of the area is set to NULL on success to avoid subsequent
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* freeing. This call will succeed even if supplying
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* the area from a failed reserved call.
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*/
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static inline s32 tcm_free(struct tcm_area *area)
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{
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s32 res = 0; /* free succeeds by default */
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if (area && area->tcm) {
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res = area->tcm->free(area->tcm, area);
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if (res == 0)
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area->tcm = NULL;
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}
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return res;
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}
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/*=============================================================================
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HELPER FUNCTION FOR ANY TILER CONTAINER MANAGER
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=============================================================================*/
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/**
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* This method slices off the topmost 2D slice from the parent area, and stores
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* it in the 'slice' parameter. The 'parent' parameter will get modified to
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* contain the remaining portion of the area. If the whole parent area can
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* fit in a 2D slice, its tcm pointer is set to NULL to mark that it is no
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* longer a valid area.
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*
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* @param parent Pointer to a VALID parent area that will get modified
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* @param slice Pointer to the slice area that will get modified
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*/
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static inline void tcm_slice(struct tcm_area *parent, struct tcm_area *slice)
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{
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*slice = *parent;
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/* check if we need to slice */
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if (slice->tcm && !slice->is2d &&
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slice->p0.y != slice->p1.y &&
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(slice->p0.x || (slice->p1.x != slice->tcm->width - 1))) {
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/* set end point of slice (start always remains) */
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slice->p1.x = slice->tcm->width - 1;
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slice->p1.y = (slice->p0.x) ? slice->p0.y : slice->p1.y - 1;
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/* adjust remaining area */
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parent->p0.x = 0;
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parent->p0.y = slice->p1.y + 1;
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} else {
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/* mark this as the last slice */
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parent->tcm = NULL;
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}
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}
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/* Verify if a tcm area is logically valid */
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static inline bool tcm_area_is_valid(struct tcm_area *area)
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{
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return area && area->tcm &&
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/* coordinate bounds */
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area->p1.x < area->tcm->width &&
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area->p1.y < area->tcm->height &&
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area->p0.y <= area->p1.y &&
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/* 1D coordinate relationship + p0.x check */
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((!area->is2d &&
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area->p0.x < area->tcm->width &&
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area->p0.x + area->p0.y * area->tcm->width <=
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area->p1.x + area->p1.y * area->tcm->width) ||
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/* 2D coordinate relationship */
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(area->is2d &&
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area->p0.x <= area->p1.x));
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}
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/* see if a coordinate is within an area */
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static inline bool __tcm_is_in(struct tcm_pt *p, struct tcm_area *a)
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{
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u16 i;
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if (a->is2d) {
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return p->x >= a->p0.x && p->x <= a->p1.x &&
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p->y >= a->p0.y && p->y <= a->p1.y;
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} else {
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i = p->x + p->y * a->tcm->width;
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return i >= a->p0.x + a->p0.y * a->tcm->width &&
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i <= a->p1.x + a->p1.y * a->tcm->width;
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}
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}
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/* calculate area width */
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static inline u16 __tcm_area_width(struct tcm_area *area)
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{
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return area->p1.x - area->p0.x + 1;
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}
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/* calculate area height */
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static inline u16 __tcm_area_height(struct tcm_area *area)
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{
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return area->p1.y - area->p0.y + 1;
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}
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/* calculate number of slots in an area */
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static inline u16 __tcm_sizeof(struct tcm_area *area)
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{
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return area->is2d ?
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__tcm_area_width(area) * __tcm_area_height(area) :
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(area->p1.x - area->p0.x + 1) + (area->p1.y - area->p0.y) *
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area->tcm->width;
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}
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#define tcm_sizeof(area) __tcm_sizeof(&(area))
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#define tcm_awidth(area) __tcm_area_width(&(area))
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#define tcm_aheight(area) __tcm_area_height(&(area))
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#define tcm_is_in(pt, area) __tcm_is_in(&(pt), &(area))
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/* limit a 1D area to the first N pages */
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static inline s32 tcm_1d_limit(struct tcm_area *a, u32 num_pg)
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{
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if (__tcm_sizeof(a) < num_pg)
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return -ENOMEM;
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if (!num_pg)
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return -EINVAL;
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a->p1.x = (a->p0.x + num_pg - 1) % a->tcm->width;
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a->p1.y = a->p0.y + ((a->p0.x + num_pg - 1) / a->tcm->width);
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return 0;
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}
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/**
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* Iterate through 2D slices of a valid area. Behaves
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* syntactically as a for(;;) statement.
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*
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* @param var Name of a local variable of type 'struct
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* tcm_area *' that will get modified to
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* contain each slice.
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* @param area Pointer to the VALID parent area. This
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* structure will not get modified
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* throughout the loop.
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*
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*/
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#define tcm_for_each_slice(var, area, safe) \
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for (safe = area, \
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tcm_slice(&safe, &var); \
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var.tcm; tcm_slice(&safe, &var))
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#endif
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