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