drm: etnaviv: extract replacement of WAIT command
Extract out the replacement of the WAIT command with some other command. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
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@ -131,6 +131,23 @@ static void etnaviv_buffer_dump(struct etnaviv_gpu *gpu,
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ptr, len * 4, 0);
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}
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/*
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* Safely replace the WAIT of a waitlink with a new command and argument.
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* The GPU may be executing this WAIT while we're modifying it, so we have
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* to write it in a specific order to avoid the GPU branching to somewhere
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* else. 'wl_offset' is the offset to the first byte of the WAIT command.
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*/
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static void etnaviv_buffer_replace_wait(struct etnaviv_cmdbuf *buffer,
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unsigned int wl_offset, u32 cmd, u32 arg)
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{
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u32 *lw = buffer->vaddr + wl_offset;
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lw[1] = arg;
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mb();
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lw[0] = cmd;
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mb();
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}
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/*
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* Ensure that there is space in the command buffer to contiguously write
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* 'cmd_dwords' 64-bit words into the buffer, wrapping if necessary.
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@ -172,7 +189,7 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, unsigned int event,
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struct etnaviv_cmdbuf *cmdbuf)
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{
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struct etnaviv_cmdbuf *buffer = gpu->buffer;
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u32 *lw = buffer->vaddr + buffer->user_size - 16;
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unsigned int waitlink_offset = buffer->user_size - 16;
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u32 back, link_target, link_size, reserve_size, extra_size = 0;
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if (drm_debug & DRM_UT_DRIVER)
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@ -219,8 +236,7 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, unsigned int event,
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print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
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cmdbuf->vaddr, cmdbuf->size, 0);
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pr_info("link op: %p\n", lw);
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pr_info("link addr: %p\n", lw + 1);
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pr_info("link op: %p\n", buffer->vaddr + waitlink_offset);
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pr_info("addr: 0x%08x\n", link_target);
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pr_info("back: 0x%08x\n", gpu_va(gpu, buffer) + back);
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pr_info("event: %d\n", event);
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@ -262,12 +278,10 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, unsigned int event,
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CMD_WAIT(buffer);
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CMD_LINK(buffer, 2, gpu_va(gpu, buffer) + (buffer->user_size - 4));
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/* Change WAIT into a LINK command; write the address first. */
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*(lw + 1) = link_target;
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mb();
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*(lw) = VIV_FE_LINK_HEADER_OP_LINK |
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VIV_FE_LINK_HEADER_PREFETCH(link_size);
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mb();
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etnaviv_buffer_replace_wait(buffer, waitlink_offset,
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VIV_FE_LINK_HEADER_OP_LINK |
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VIV_FE_LINK_HEADER_PREFETCH(link_size),
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link_target);
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if (drm_debug & DRM_UT_DRIVER)
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etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
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