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lib/drmtest: add gpu quiescent helper

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Some tests are higly timing dependent and others carelessly leave
active buffers behind. So add a helper to quiescent the gpu and call
it unconditionally when opening an fd in a vain attempt to make all
this race-condition hitting more scientifically sound.

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-01-11 17:19:53 +01:00
parent 7a54bfa772
commit 9f87660304
2 changed files with 46 additions and 1 deletions
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46
lib/drmtest.c
View File

@ -55,6 +55,48 @@ is_intel(int fd)
return IS_INTEL(devid);
}
/* Ensure the gpu is idle by launching a nop execbuf and stalling for it. */
void gem_quiescent_gpu(int fd)
{
#define MI_BATCH_BUFFER_END (0xA<<23)
uint32_t batch[2] = {MI_BATCH_BUFFER_END, 0};
uint32_t handle;
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 gem_exec[1];
int ret = 0;
handle = gem_create(fd, 4096);
gem_write(fd, handle, 0, batch, sizeof(batch));
gem_exec[0].handle = handle;
gem_exec[0].relocation_count = 0;
gem_exec[0].relocs_ptr = 0;
gem_exec[0].alignment = 0;
gem_exec[0].offset = 0;
gem_exec[0].flags = 0;
gem_exec[0].rsvd1 = 0;
gem_exec[0].rsvd2 = 0;
execbuf.buffers_ptr = (uintptr_t)gem_exec;
execbuf.buffer_count = 1;
execbuf.batch_start_offset = 0;
execbuf.batch_len = 8;
execbuf.cliprects_ptr = 0;
execbuf.num_cliprects = 0;
execbuf.DR1 = 0;
execbuf.DR4 = 0;
execbuf.flags = 0;
execbuf.rsvd1 = 0;
execbuf.rsvd2 = 0;
ret = drmIoctl(fd,
DRM_IOCTL_I915_GEM_EXECBUFFER2,
&execbuf);
assert(ret == 0);
gem_sync(fd, handle);
}
/** Open the first DRM device we can find, searching up to 16 device nodes */
int drm_open_any(void)
{
@ -67,8 +109,10 @@ int drm_open_any(void)
if (fd == -1)
continue;
if (is_intel(fd))
if (is_intel(fd)) {
gem_quiescent_gpu(fd);
return fd;
}
close(fd);
}

1
lib/drmtest.h
View File

@ -36,6 +36,7 @@
int drm_open_any(void);
int drm_open_any_master(void);
void gem_quiescent_gpu(int fd);
void gem_set_tiling(int fd, uint32_t handle, int tiling, int stride);
void gem_close(int fd, uint32_t handle);