drm/xe: Introduce a new DRM driver for Intel GPUs

Xe, is a new driver for Intel GPUs that supports both integrated and
discrete platforms starting with Tiger Lake (first Intel Xe Architecture).

The code is at a stage where it is already functional and has experimental
support for multiple platforms starting from Tiger Lake, with initial
support implemented in Mesa (for Iris and Anv, our OpenGL and Vulkan
drivers), as well as in NEO (for OpenCL and Level0).

The new Xe driver leverages a lot from i915.

As for display, the intent is to share the display code with the i915
driver so that there is maximum reuse there. But it is not added
in this patch.

This initial work is a collaboration of many people and unfortunately
the big squashed patch won't fully honor the proper credits. But let's
get some git quick stats so we can at least try to preserve some of the
credits:

Co-developed-by: Matthew Brost <matthew.brost@intel.com>
Co-developed-by: Matthew Auld <matthew.auld@intel.com>
Co-developed-by: Matt Roper <matthew.d.roper@intel.com>
Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Co-developed-by: Francois Dugast <francois.dugast@intel.com>
Co-developed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Co-developed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Co-developed-by: Philippe Lecluse <philippe.lecluse@intel.com>
Co-developed-by: Nirmoy Das <nirmoy.das@intel.com>
Co-developed-by: Jani Nikula <jani.nikula@intel.com>
Co-developed-by: José Roberto de Souza <jose.souza@intel.com>
Co-developed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Co-developed-by: Dave Airlie <airlied@redhat.com>
Co-developed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Co-developed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Co-developed-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>

1 files changed, 226 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_uc.c b/drivers/gpu/drm/xe/xe_uc.c
new file mode 100644
index 000000000000..938d14698003
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_uc.c
@@ -0,0 +1,226 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "xe_device.h"
+#include "xe_huc.h"
+#include "xe_gt.h"
+#include "xe_guc.h"
+#include "xe_guc_pc.h"
+#include "xe_guc_submit.h"
+#include "xe_uc.h"
+#include "xe_uc_fw.h"
+#include "xe_wopcm.h"
+
+static struct xe_gt *
+uc_to_gt(struct xe_uc *uc)
+{
+	return container_of(uc, struct xe_gt, uc);
+}
+
+static struct xe_device *
+uc_to_xe(struct xe_uc *uc)
+{
+	return gt_to_xe(uc_to_gt(uc));
+}
+
+/* Should be called once at driver load only */
+int xe_uc_init(struct xe_uc *uc)
+{
+	int ret;
+
+	/* GuC submission not enabled, nothing to do */
+	if (!xe_device_guc_submission_enabled(uc_to_xe(uc)))
+		return 0;
+
+	ret = xe_guc_init(&uc->guc);
+	if (ret)
+		goto err;
+
+	ret = xe_huc_init(&uc->huc);
+	if (ret)
+		goto err;
+
+	ret = xe_wopcm_init(&uc->wopcm);
+	if (ret)
+		goto err;
+
+	ret = xe_guc_submit_init(&uc->guc);
+	if (ret)
+		goto err;
+
+	return 0;
+
+err:
+	/* If any uC firmwares not found, fall back to execlists */
+	xe_device_guc_submission_disable(uc_to_xe(uc));
+
+	return ret;
+}
+
+/**
+ * xe_uc_init_post_hwconfig - init Uc post hwconfig load
+ * @uc: The UC object
+ *
+ * Return: 0 on success, negative error code on error.
+ */
+int xe_uc_init_post_hwconfig(struct xe_uc *uc)
+{
+	/* GuC submission not enabled, nothing to do */
+	if (!xe_device_guc_submission_enabled(uc_to_xe(uc)))
+		return 0;
+
+	return xe_guc_init_post_hwconfig(&uc->guc);
+}
+
+static int uc_reset(struct xe_uc *uc)
+{
+	struct xe_device *xe = uc_to_xe(uc);
+	int ret;
+
+	ret = xe_guc_reset(&uc->guc);
+	if (ret) {
+		drm_err(&xe->drm, "Failed to reset GuC, ret = %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int uc_sanitize(struct xe_uc *uc)
+{
+	xe_huc_sanitize(&uc->huc);
+	xe_guc_sanitize(&uc->guc);
+
+	return uc_reset(uc);
+}
+
+/**
+ * xe_uc_init_hwconfig - minimally init Uc, read and parse hwconfig
+ * @uc: The UC object
+ *
+ * Return: 0 on success, negative error code on error.
+ */
+int xe_uc_init_hwconfig(struct xe_uc *uc)
+{
+	int ret;
+
+	/* GuC submission not enabled, nothing to do */
+	if (!xe_device_guc_submission_enabled(uc_to_xe(uc)))
+		return 0;
+
+	ret = xe_guc_min_load_for_hwconfig(&uc->guc);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/*
+ * Should be called during driver load, after every GT reset, and after every
+ * suspend to reload / auth the firmwares.
+ */
+int xe_uc_init_hw(struct xe_uc *uc)
+{
+	int ret;
+
+	/* GuC submission not enabled, nothing to do */
+	if (!xe_device_guc_submission_enabled(uc_to_xe(uc)))
+		return 0;
+
+	ret = uc_sanitize(uc);
+	if (ret)
+		return ret;
+
+	ret = xe_huc_upload(&uc->huc);
+	if (ret)
+		return ret;
+
+	ret = xe_guc_upload(&uc->guc);
+	if (ret)
+		return ret;
+
+	ret = xe_guc_enable_communication(&uc->guc);
+	if (ret)
+		return ret;
+
+	ret = xe_gt_record_default_lrcs(uc_to_gt(uc));
+	if (ret)
+		return ret;
+
+	ret = xe_guc_post_load_init(&uc->guc);
+	if (ret)
+		return ret;
+
+	ret = xe_guc_pc_start(&uc->guc.pc);
+	if (ret)
+		return ret;
+
+	/* We don't fail the driver load if HuC fails to auth, but let's warn */
+	ret = xe_huc_auth(&uc->huc);
+	XE_WARN_ON(ret);
+
+	return 0;
+}
+
+int xe_uc_reset_prepare(struct xe_uc *uc)
+{
+	/* GuC submission not enabled, nothing to do */
+	if (!xe_device_guc_submission_enabled(uc_to_xe(uc)))
+		return 0;
+
+	return xe_guc_reset_prepare(&uc->guc);
+}
+
+void xe_uc_stop_prepare(struct xe_uc *uc)
+{
+	xe_guc_stop_prepare(&uc->guc);
+}
+
+int xe_uc_stop(struct xe_uc *uc)
+{
+	/* GuC submission not enabled, nothing to do */
+	if (!xe_device_guc_submission_enabled(uc_to_xe(uc)))
+		return 0;
+
+	return xe_guc_stop(&uc->guc);
+}
+
+int xe_uc_start(struct xe_uc *uc)
+{
+	/* GuC submission not enabled, nothing to do */
+	if (!xe_device_guc_submission_enabled(uc_to_xe(uc)))
+		return 0;
+
+	return xe_guc_start(&uc->guc);
+}
+
+static void uc_reset_wait(struct xe_uc *uc)
+{
+       int ret;
+
+again:
+       xe_guc_reset_wait(&uc->guc);
+
+       ret = xe_uc_reset_prepare(uc);
+       if (ret)
+               goto again;
+}
+
+int xe_uc_suspend(struct xe_uc *uc)
+{
+	int ret;
+
+	/* GuC submission not enabled, nothing to do */
+	if (!xe_device_guc_submission_enabled(uc_to_xe(uc)))
+		return 0;
+
+	uc_reset_wait(uc);
+
+	ret = xe_uc_stop(uc);
+	if (ret)
+		return ret;
+
+	return xe_guc_suspend(&uc->guc);
+}