drm/xe/gsc: Initialize GSC proxy

The GSC uC needs to communicate with the CSME to perform certain
operations. Since the GSC can't perform this communication directly on
platforms where it is integrated in GT, the graphics driver needs to
transfer the messages from GSC to CSME and back. The proxy flow must be
manually started after the GSC is loaded to signal to GSC that we're
ready to handle its messages and allow it to query its init data from
CSME.

Note that the component must be removed before the pci_remove call
completes, so we can't use a drmm helper for it and we need to instead
perform the cleanup as part of the removal flow.

v2: add function documentation, more targeted memory clear, clearer logs
and variable names (Alan)

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240117182621.2653049-2-daniele.ceraolospurio@intel.com

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_gt.c b/drivers/gpu/drm/xe/xe_gt.c
index 0f2258dc4a00..1fe4d54409d3 100644
--- a/drivers/gpu/drm/xe/xe_gt.c
+++ b/drivers/gpu/drm/xe/xe_gt.c
@@ -78,6 +78,19 @@ void xe_gt_sanitize(struct xe_gt *gt)
 	gt->uc.guc.submission_state.enabled = false;
 }
 
+/**
+ * xe_gt_remove() - Clean up the GT structures before driver removal
+ * @gt: the GT object
+ *
+ * This function should only act on objects/structures that must be cleaned
+ * before the driver removal callback is complete and therefore can't be
+ * deferred to a drmm action.
+ */
+void xe_gt_remove(struct xe_gt *gt)
+{
+	xe_uc_remove(&gt->uc);
+}
+
 static void gt_fini(struct drm_device *drm, void *arg)
 {
 	struct xe_gt *gt = arg;