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, 189 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_step.c b/drivers/gpu/drm/xe/xe_step.c
new file mode 100644
index 000000000000..ca77d0971529
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_step.c
@@ -0,0 +1,189 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "xe_step.h"
+
+#include "xe_device.h"
+#include "xe_platform_types.h"
+
+/*
+ * Provide mapping between PCI's revision ID to the individual GMD
+ * (Graphics/Media/Display) stepping values that can be compared numerically.
+ *
+ * Some platforms may have unusual ways of mapping PCI revision ID to GMD
+ * steppings.  E.g., in some cases a higher PCI revision may translate to a
+ * lower stepping of the GT and/or display IP.
+ *
+ * Also note that some revisions/steppings may have been set aside as
+ * placeholders but never materialized in real hardware; in those cases there
+ * may be jumps in the revision IDs or stepping values in the tables below.
+ */
+
+/*
+ * Some platforms always have the same stepping value for GT and display;
+ * use a macro to define these to make it easier to identify the platforms
+ * where the two steppings can deviate.
+ */
+#define COMMON_GT_MEDIA_STEP(x_)	\
+	.graphics = STEP_##x_,		\
+	.media = STEP_##x_
+
+#define COMMON_STEP(x_)			\
+	COMMON_GT_MEDIA_STEP(x_),	\
+	.graphics = STEP_##x_,		\
+	.media = STEP_##x_,		\
+	.display = STEP_##x_
+
+__diag_push();
+__diag_ignore_all("-Woverride-init", "Allow field overrides in table");
+
+/* Same GT stepping between tgl_uy_revids and tgl_revids don't mean the same HW */
+static const struct xe_step_info tgl_revids[] = {
+	[0] = { COMMON_GT_MEDIA_STEP(A0), .display = STEP_B0 },
+	[1] = { COMMON_GT_MEDIA_STEP(B0), .display = STEP_D0 },
+};
+
+static const struct xe_step_info dg1_revids[] = {
+	[0] = { COMMON_STEP(A0) },
+	[1] = { COMMON_STEP(B0) },
+};
+
+static const struct xe_step_info adls_revids[] = {
+	[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display = STEP_A0 },
+	[0x1] = { COMMON_GT_MEDIA_STEP(A0), .display = STEP_A2 },
+	[0x4] = { COMMON_GT_MEDIA_STEP(B0), .display = STEP_B0 },
+	[0x8] = { COMMON_GT_MEDIA_STEP(C0), .display = STEP_B0 },
+	[0xC] = { COMMON_GT_MEDIA_STEP(D0), .display = STEP_C0 },
+};
+
+static const struct xe_step_info dg2_g10_revid_step_tbl[] = {
+	[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display = STEP_A0 },
+	[0x1] = { COMMON_GT_MEDIA_STEP(A1), .display = STEP_A0 },
+	[0x4] = { COMMON_GT_MEDIA_STEP(B0), .display = STEP_B0 },
+	[0x8] = { COMMON_GT_MEDIA_STEP(C0), .display = STEP_C0 },
+};
+
+static const struct xe_step_info dg2_g11_revid_step_tbl[] = {
+	[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display = STEP_B0 },
+	[0x4] = { COMMON_GT_MEDIA_STEP(B0), .display = STEP_C0 },
+	[0x5] = { COMMON_GT_MEDIA_STEP(B1), .display = STEP_C0 },
+};
+
+static const struct xe_step_info dg2_g12_revid_step_tbl[] = {
+	[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display = STEP_C0 },
+	[0x1] = { COMMON_GT_MEDIA_STEP(A1), .display = STEP_C0 },
+};
+
+static const struct xe_step_info pvc_revid_step_tbl[] = {
+	[0x3] = { .graphics = STEP_A0 },
+	[0x5] = { .graphics = STEP_B0 },
+	[0x6] = { .graphics = STEP_B1 },
+	[0x7] = { .graphics = STEP_C0 },
+};
+
+static const int pvc_basedie_subids[] = {
+	[0x0] = STEP_A0,
+	[0x3] = STEP_B0,
+	[0x4] = STEP_B1,
+	[0x5] = STEP_B3,
+};
+
+__diag_pop();
+
+struct xe_step_info xe_step_get(struct xe_device *xe)
+{
+	const struct xe_step_info *revids = NULL;
+	struct xe_step_info step = {};
+	u16 revid = xe->info.revid;
+	int size = 0;
+	const int *basedie_info = NULL;
+	int basedie_size = 0;
+	int baseid = 0;
+
+	if (xe->info.platform == XE_PVC) {
+		baseid = FIELD_GET(GENMASK(5, 3), xe->info.revid);
+		revid = FIELD_GET(GENMASK(2, 0), xe->info.revid);
+		revids = pvc_revid_step_tbl;
+		size = ARRAY_SIZE(pvc_revid_step_tbl);
+		basedie_info = pvc_basedie_subids;
+		basedie_size = ARRAY_SIZE(pvc_basedie_subids);
+	} else if (xe->info.subplatform == XE_SUBPLATFORM_DG2_G10) {
+		revids = dg2_g10_revid_step_tbl;
+		size = ARRAY_SIZE(dg2_g10_revid_step_tbl);
+	} else if (xe->info.subplatform == XE_SUBPLATFORM_DG2_G11) {
+		revids = dg2_g11_revid_step_tbl;
+		size = ARRAY_SIZE(dg2_g11_revid_step_tbl);
+	} else if (xe->info.subplatform == XE_SUBPLATFORM_DG2_G12) {
+		revids = dg2_g12_revid_step_tbl;
+		size = ARRAY_SIZE(dg2_g12_revid_step_tbl);
+	} else if (xe->info.platform == XE_ALDERLAKE_S) {
+		revids = adls_revids;
+		size = ARRAY_SIZE(adls_revids);
+	} else if (xe->info.platform == XE_DG1) {
+		revids = dg1_revids;
+		size = ARRAY_SIZE(dg1_revids);
+	} else if (xe->info.platform == XE_TIGERLAKE) {
+		revids = tgl_revids;
+		size = ARRAY_SIZE(tgl_revids);
+	}
+
+	/* Not using the stepping scheme for the platform yet. */
+	if (!revids)
+		return step;
+
+	if (revid < size && revids[revid].graphics != STEP_NONE) {
+		step = revids[revid];
+	} else {
+		drm_warn(&xe->drm, "Unknown revid 0x%02x\n", revid);
+
+		/*
+		 * If we hit a gap in the revid array, use the information for
+		 * the next revid.
+		 *
+		 * This may be wrong in all sorts of ways, especially if the
+		 * steppings in the array are not monotonically increasing, but
+		 * it's better than defaulting to 0.
+		 */
+		while (revid < size && revids[revid].graphics == STEP_NONE)
+			revid++;
+
+		if (revid < size) {
+			drm_dbg(&xe->drm, "Using steppings for revid 0x%02x\n",
+				revid);
+			step = revids[revid];
+		} else {
+			drm_dbg(&xe->drm, "Using future steppings\n");
+			step.graphics = STEP_FUTURE;
+			step.display = STEP_FUTURE;
+		}
+	}
+
+	drm_WARN_ON(&xe->drm, step.graphics == STEP_NONE);
+
+	if (basedie_info && basedie_size) {
+		if (baseid < basedie_size && basedie_info[baseid] != STEP_NONE) {
+			step.basedie = basedie_info[baseid];
+		} else {
+			drm_warn(&xe->drm, "Unknown baseid 0x%02x\n", baseid);
+			step.basedie = STEP_FUTURE;
+		}
+	}
+
+	return step;
+}
+
+#define STEP_NAME_CASE(name)	\
+	case STEP_##name:	\
+		return #name;
+
+const char *xe_step_name(enum xe_step step)
+{
+	switch (step) {
+	STEP_NAME_LIST(STEP_NAME_CASE);
+
+	default:
+		return "**";
+	}
+}