C++ (Cpp) ww_acquire_done Examples

Example #1

File: etnaviv_gem_submit.c Project: JamesChenFromChina/linux

static int submit_lock_objects(struct etnaviv_gem_submit *submit,
		struct ww_acquire_ctx *ticket)
{
	int contended, slow_locked = -1, i, ret = 0;

retry:
	for (i = 0; i < submit->nr_bos; i++) {
		struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;

		if (slow_locked == i)
			slow_locked = -1;

		contended = i;

		if (!(submit->bos[i].flags & BO_LOCKED)) {
			ret = ww_mutex_lock_interruptible(&etnaviv_obj->resv->lock,
							  ticket);
			if (ret == -EALREADY)
				DRM_ERROR("BO at index %u already on submit list\n",
					  i);
			if (ret)
				goto fail;
			submit->bos[i].flags |= BO_LOCKED;
		}
	}

	ww_acquire_done(ticket);

	return 0;

fail:
	for (; i >= 0; i--)
		submit_unlock_object(submit, i);

	if (slow_locked > 0)
		submit_unlock_object(submit, slow_locked);

	if (ret == -EDEADLK) {
		struct etnaviv_gem_object *etnaviv_obj;

		etnaviv_obj = submit->bos[contended].obj;

		/* we lost out in a seqno race, lock and retry.. */
		ret = ww_mutex_lock_slow_interruptible(&etnaviv_obj->resv->lock,
						       ticket);
		if (!ret) {
			submit->bos[contended].flags |= BO_LOCKED;
			slow_locked = contended;
			goto retry;
		}
	}

	return ret;
}

Example #2

File: drm_sync_helper.c Project: McPrapor/kernel_misu

int drm_lock_reservations(struct reservation_object **resvs,
			  unsigned int num_resvs, struct ww_acquire_ctx *ctx)
{
	unsigned int r;
	struct reservation_object *slow_res = NULL;

	ww_acquire_init(ctx, &reservation_ww_class);

retry:
	for (r = 0; r < num_resvs; r++) {
		int ret;
		/* skip the resv we locked with slow lock */
		if (resvs[r] == slow_res) {
			slow_res = NULL;
			continue;
		}
		ret = ww_mutex_lock(&resvs[r]->lock, ctx);
		if (ret < 0) {
			unsigned int slow_r = r;
			/*
			 * undo all the locks we already done,
			 * in reverse order
			 */
			while (r > 0) {
				r--;
				ww_mutex_unlock(&resvs[r]->lock);
			}
			if (slow_res)
				ww_mutex_unlock(&slow_res->lock);
			if (ret == -EDEADLK) {
				slow_res = resvs[slow_r];
				ww_mutex_lock_slow(&slow_res->lock, ctx);
				goto retry;
			}
			ww_acquire_fini(ctx);
			return ret;
		}
	}

	ww_acquire_done(ctx);
	return 0;
}