drm/i915/uc: Introduce GSC FW

On MTL the GSC FW needs to be loaded on the media GT by the graphics
driver. We're going to treat it like a new uc_fw, so add the initial
defs and init/fini functions for it.

Similarly to the other FWs, the GSC FW path can be overridden via
modparam. The modparam can also be used to disable the GSC FW loading by
setting it to an empty string.

Note that the new structure has been called intel_gsc_uc to avoid
confusion with the existing intel_gsc, which instead represents the heci
gsc interfaces.

v2: re-order Makefile list to be properly sorted (Jani, Alan), better
    comment (alan)

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>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221208200521.2928378-2-daniele.ceraolospurio@intel.com

1 files changed, 70 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.c
new file mode 100644
index 000000000000..7abbbb09f432
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include <linux/types.h>
+
+#include "gt/intel_gt.h"
+#include "intel_gsc_uc.h"
+#include "i915_drv.h"
+
+static bool gsc_engine_supported(struct intel_gt *gt)
+{
+	intel_engine_mask_t mask;
+
+	/*
+	 * We reach here from i915_driver_early_probe for the primary GT before
+	 * its engine mask is set, so we use the device info engine mask for it.
+	 * For other GTs we expect the GT-specific mask to be set before we
+	 * call this function.
+	 */
+	GEM_BUG_ON(!gt_is_root(gt) && !gt->info.engine_mask);
+
+	if (gt_is_root(gt))
+		mask = RUNTIME_INFO(gt->i915)->platform_engine_mask;
+	else
+		mask = gt->info.engine_mask;
+
+	return __HAS_ENGINE(mask, GSC0);
+}
+
+void intel_gsc_uc_init_early(struct intel_gsc_uc *gsc)
+{
+	intel_uc_fw_init_early(&gsc->fw, INTEL_UC_FW_TYPE_GSC);
+
+	/* we can arrive here from i915_driver_early_probe for primary
+	 * GT with it being not fully setup hence check device info's
+	 * engine mask
+	 */
+	if (!gsc_engine_supported(gsc_uc_to_gt(gsc))) {
+		intel_uc_fw_change_status(&gsc->fw, INTEL_UC_FIRMWARE_NOT_SUPPORTED);
+		return;
+	}
+}
+
+int intel_gsc_uc_init(struct intel_gsc_uc *gsc)
+{
+	struct drm_i915_private *i915 = gsc_uc_to_gt(gsc)->i915;
+	int err;
+
+	err = intel_uc_fw_init(&gsc->fw);
+	if (err)
+		goto out;
+
+	intel_uc_fw_change_status(&gsc->fw, INTEL_UC_FIRMWARE_LOADABLE);
+
+	return 0;
+
+out:
+	i915_probe_error(i915, "failed with %d\n", err);
+	return err;
+}
+
+void intel_gsc_uc_fini(struct intel_gsc_uc *gsc)
+{
+	if (!intel_uc_fw_is_loadable(&gsc->fw))
+		return;
+
+	intel_uc_fw_fini(&gsc->fw);
+}