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drm/omap: Use bitmaps for TILER placement

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Modified Tiler placement to utilize bitmaps for bookkeeping and
all placement algorithms.  This resulted in a substantial savings
in time for all Tiler reservation and free operations.  Typical
savings are in the range of 28% decrease in time taken with larger
buffers showing a 80%+ decrease.

Signed-off-by: Andy Gross <andy.gross@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Andy Gross
2015-08-12 11:24:38 +03:00
committed by Tomi Valkeinen
parent 73d77107b8
commit 0d6fa53fd8
3 changed files with 225 additions and 658 deletions
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26
drivers/gpu/drm/omapdrm/tcm.h
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@@ -61,18 +61,17 @@ struct tcm {
unsigned int y_offset; /* offset to use for y coordinates */
/* 'pvt' structure shall contain any tcm details (attr) along with
linked list of allocated areas and mutex for mutually exclusive access
to the list. It may also contain copies of width and height to notice
any changes to the publicly available width and height fields. */
void *pvt;
spinlock_t lock;
unsigned long *bitmap;
size_t map_size;
/* function table */
s32 (*reserve_2d)(struct tcm *tcm, u16 height, u16 width, u8 align,
s32 (*reserve_2d)(struct tcm *tcm, u16 height, u16 width, u16 align,
int16_t offset, uint16_t 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);
s32 (*free)(struct tcm *tcm, struct tcm_area *area);
void (*deinit)(struct tcm *tcm);
};
/*=============================================================================
@@ -91,7 +90,7 @@ struct tcm {
*
*/
struct tcm *sita_init(u16 width, u16 height, struct tcm_pt *attr);
struct tcm *sita_init(u16 width, u16 height);
/**
@@ -120,6 +119,9 @@ static inline void tcm_deinit(struct tcm *tcm)
* 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,
@@ -129,7 +131,8 @@ static inline void tcm_deinit(struct tcm *tcm)
* allocation.
*/
static inline s32 tcm_reserve_2d(struct tcm *tcm, u16 width, u16 height,
u16 align, struct tcm_area *area)
u16 align, int16_t offset, uint16_t slot_bytes,
struct tcm_area *area)
{
/* perform rudimentary error checking */
s32 res = tcm == NULL ? -ENODEV :
@@ -140,7 +143,8 @@ static inline s32 tcm_reserve_2d(struct tcm *tcm, u16 width, u16 height,
if (!res) {
area->is2d = true;
res = tcm->reserve_2d(tcm, height, width, align, area);
res = tcm->reserve_2d(tcm, height, width, align, offset,
slot_bytes, area);
area->tcm = res ? NULL : tcm;
}