accel/ivpu: Add command buffer submission logic

Each of the user contexts has two command queues, one for compute engine
and one for the copy engine. Command queues are allocated and registered
in the device when the first job (command buffer) is submitted from
the user space to the VPU device. The userspace provides a list of
GEM buffer object handles to submit to the VPU, the driver resolves
buffer handles, pins physical memory if needed, increments ref count
for each buffer and stores pointers to buffer objects in
the ivpu_job objects that track jobs submitted to the device.
The VPU signals job completion with an asynchronous message that
contains the job id passed to firmware when the job was submitted.

Currently, the driver supports simple scheduling logic
where jobs submitted from user space are immediately pushed
to the VPU device command queues. In the future, it will be
extended to use hardware base scheduling and/or drm_sched.

Co-developed-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>
Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20230117092723.60441-7-jacek.lawrynowicz@linux.intel.com

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/accel/ivpu/ivpu_gem.c b/drivers/accel/ivpu/ivpu_gem.c
index b938359b19af..d1f923971b4c 100644
--- a/drivers/accel/ivpu/ivpu_gem.c
+++ b/drivers/accel/ivpu/ivpu_gem.c
@@ -678,6 +678,32 @@ unlock:
 	return ret;
 }
 
+int ivpu_bo_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
+{
+	struct drm_ivpu_bo_wait *args = data;
+	struct drm_gem_object *obj;
+	unsigned long timeout;
+	long ret;
+
+	timeout = drm_timeout_abs_to_jiffies(args->timeout_ns);
+
+	obj = drm_gem_object_lookup(file, args->handle);
+	if (!obj)
+		return -EINVAL;
+
+	ret = dma_resv_wait_timeout(obj->resv, DMA_RESV_USAGE_READ, true, timeout);
+	if (ret == 0) {
+		ret = -ETIMEDOUT;
+	} else if (ret > 0) {
+		ret = 0;
+		args->job_status = to_ivpu_bo(obj)->job_status;
+	}
+
+	drm_gem_object_put(obj);
+
+	return ret;
+}
+
 static void ivpu_bo_print_info(struct ivpu_bo *bo, struct drm_printer *p)
 {
 	unsigned long dma_refcount = 0;