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drm: etnaviv: extract command ring reservation 

Provide a helper etnaviv_buffer_reserve() to ensure that we can fit a
set of commands into the ring buffer without wrapping by moving code
out of etnaviv_buffer_queue().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
This commit is contained in:
Russell King 2016-01-21 15:20:04 +00:00 committed by Lucas Stach
parent 471070abd2
commit 584a13c6e6
1 changed files with 14 additions and 8 deletions
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22
drivers/gpu/drm/etnaviv/etnaviv_buffer.c
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@ -131,6 +131,19 @@ static void etnaviv_buffer_dump(struct etnaviv_gpu *gpu,
ptr, len * 4, 0);
}
/*
* Ensure that there is space in the command buffer to contiguously write
* 'cmd_dwords' 64-bit words into the buffer, wrapping if necessary.
*/
static u32 etnaviv_buffer_reserve(struct etnaviv_gpu *gpu,
struct etnaviv_cmdbuf *buffer, unsigned int cmd_dwords)
{
if (buffer->user_size + cmd_dwords * sizeof(u64) > buffer->size)
buffer->user_size = 0;
return gpu_va(gpu, buffer) + buffer->user_size;
}
u16 etnaviv_buffer_init(struct etnaviv_gpu *gpu)
{
struct etnaviv_cmdbuf *buffer = gpu->buffer;
@ -183,15 +196,10 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, unsigned int event,
reserve_size = (6 + extra_size) * 4;
/*
* if we are going to completely overflow the buffer, we need to wrap.
*/
if (buffer->user_size + reserve_size > buffer->size)
buffer->user_size = 0;
link_target = etnaviv_buffer_reserve(gpu, buffer, reserve_size / 8);
/* save offset back into main buffer */
back = buffer->user_size + reserve_size - 6 * 4;
link_target = gpu_va(gpu, buffer) + buffer->user_size;
link_size = 6;
/* Skip over any extra instructions */
@ -207,8 +215,6 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, unsigned int event,
link_target = gpu_va(gpu, cmdbuf);
link_size = cmdbuf->size / 8;
if (drm_debug & DRM_UT_DRIVER) {
print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
cmdbuf->vaddr, cmdbuf->size, 0);