drm/xe/gsc: Introduce GSC FW

Add the basic definitions and init function. Same as HuC, GSC is only
supported on the media GT on MTL and newer platforms.
Note that the GSC requires submission resources which can't be allocated
during init (because we don't have the hwconfig yet), so it can't be
marked as loadable at the end of the init function. The allocation of
those resources will come in the patch that makes use of them to load
the FW.

v2: better comment, move num FWs define inside the enum (John)

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_gsc.c b/drivers/gpu/drm/xe/xe_gsc.c
new file mode 100644
index 000000000000..216f36cee0f7
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_gsc.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include "xe_gsc.h"
+
+#include "xe_device.h"
+#include "xe_gt.h"
+#include "xe_gt_printk.h"
+#include "xe_uc_fw.h"
+
+static struct xe_gt *
+gsc_to_gt(struct xe_gsc *gsc)
+{
+	return container_of(gsc, struct xe_gt, uc.gsc);
+}
+
+int xe_gsc_init(struct xe_gsc *gsc)
+{
+	struct xe_gt *gt = gsc_to_gt(gsc);
+	struct xe_tile *tile = gt_to_tile(gt);
+	int ret;
+
+	gsc->fw.type = XE_UC_FW_TYPE_GSC;
+
+	/* The GSC uC is only available on the media GT */
+	if (tile->media_gt && (gt != tile->media_gt)) {
+		xe_uc_fw_change_status(&gsc->fw, XE_UC_FIRMWARE_NOT_SUPPORTED);
+		return 0;
+	}
+
+	/*
+	 * Some platforms can have GuC but not GSC. That would cause
+	 * xe_uc_fw_init(gsc) to return a "not supported" failure code and abort
+	 * all firmware loading. So check for GSC being enabled before
+	 * propagating the failure back up. That way the higher level will keep
+	 * going and load GuC as appropriate.
+	 */
+	ret = xe_uc_fw_init(&gsc->fw);
+	if (!xe_uc_fw_is_enabled(&gsc->fw))
+		return 0;
+	else if (ret)
+		goto out;
+
+	return 0;
+
+out:
+	xe_gt_err(gt, "GSC init failed with %d", ret);
+	return ret;
+}
+