static void
dontneed_after_mmap(void)
{
int fd = drm_open_driver(DRIVER_INTEL);
uint32_t handle;
char *ptr;
handle = gem_create(fd, OBJECT_SIZE);
ptr = __gem_mmap__gtt(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
igt_assert(ptr);
gem_madvise(fd, handle, I915_MADV_DONTNEED);
close(fd);
signal(SIGBUS, sigtrap);
switch (setjmp(jmp)) {
case SIGBUS:
break;
case 0:
*ptr = 0;
default:
igt_assert(!"reached");
break;
}
munmap(ptr, OBJECT_SIZE);
signal(SIGBUS, SIG_DFL);
}
static void
dontneed_before_mmap(void)
{
int fd = drm_open_driver(DRIVER_INTEL);
uint32_t handle;
char *ptr;
handle = gem_create(fd, OBJECT_SIZE);
gem_madvise(fd, handle, I915_MADV_DONTNEED);
ptr = __gem_mmap__gtt(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
igt_assert(ptr == NULL);
igt_assert(errno == EFAULT);
close(fd);
}
static void
dontneed_before_pwrite(void)
{
int fd = drm_open_driver(DRIVER_INTEL);
uint32_t buf[] = { MI_BATCH_BUFFER_END, 0 };
struct drm_i915_gem_pwrite gem_pwrite;
gem_pwrite.handle = gem_create(fd, OBJECT_SIZE);
gem_pwrite.offset = 0;
gem_pwrite.size = sizeof(buf);
gem_pwrite.data_ptr = (uintptr_t)buf;
gem_madvise(fd, gem_pwrite.handle, I915_MADV_DONTNEED);
igt_assert(drmIoctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &gem_pwrite));
igt_assert(errno == EFAULT);
gem_close(fd, gem_pwrite.handle);
close(fd);
}
static void
create_and_map_bo(int fd)
{
uint32_t handle;
char *ptr;
handle = gem_create(fd, OBJECT_SIZE);
ptr = gem_mmap__gtt(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
/* touch it to force it into the gtt */
*ptr = 0;
/* but then unmap it again because we only have limited address space on
* 32 bit */
munmap(ptr, OBJECT_SIZE);
/* we happily leak objects to exhaust mmap offset space, the kernel will
* reap backing storage. */
gem_madvise(fd, handle, I915_MADV_DONTNEED);
}
static void
dontneed_before_exec(void)
{
int fd = drm_open_driver(DRIVER_INTEL);
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 exec;
uint32_t buf[] = { MI_BATCH_BUFFER_END, 0 };
memset(&execbuf, 0, sizeof(execbuf));
memset(&exec, 0, sizeof(exec));
exec.handle = gem_create(fd, OBJECT_SIZE);
gem_write(fd, exec.handle, 0, buf, sizeof(buf));
gem_madvise(fd, exec.handle, I915_MADV_DONTNEED);
execbuf.buffers_ptr = (uintptr_t)&exec;
execbuf.buffer_count = 1;
execbuf.batch_len = sizeof(buf);
gem_execbuf(fd, &execbuf);
gem_close(fd, exec.handle);
close(fd);
}
