radeonsi: Fix dead lock with aux_context_lock in si_screen_clear_buffer.

After disable SDMA on Arcturus(gfx9), dead lock with aux_context_lock is
detected since si_screen_clear_buffer is called recursively before
release lock.

The call trace is:
si_clear_render_target->si_compute_clear_render_target->
si_launch_grid_internal->si_launch_grid->si_emit_cache_flush->
si_prim_discard_signal_next_compute_ib_start->u_suballocator_alloc->
si_resource_create->si_buffer_create->si_alloc_resource->
si_screen_clear_buffer->simple_mtx_lock->
si_sdma_clear_buffer->si_pipe_clear_buffer->
si_clear_buffer->si_compute_do_clear_or_copy->
si_launch_grid_internal->si_launch_grid->si_emit_cache_flush->
si_prim_discard_signal_next_compute_ib_start->u_suballocator_alloc->
si_resource_create->si_buffer_create->si_alloc_resource->
si_screen_clear_buffer->simple_mtx_lock

Fixes: 07a49bf5976 "radeonsi: disable SDMA on gfx9"
Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6941>
1 file changed