linux/drivers/gpu/drm/xe/xe_step.c

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2022 Intel Corporation
 */

#include "xe_step.h"

#include <linux/bitfield.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_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[] = …;

static const struct xe_step_info dg1_revids[] = …;

static const struct xe_step_info adls_revids[] = …;

static const struct xe_step_info adls_rpls_revids[] = …;

static const struct xe_step_info adlp_revids[] = …;

static const struct xe_step_info adlp_rpl_revids[] = …;

static const struct xe_step_info adln_revids[] = …;

static const struct xe_step_info dg2_g10_revid_step_tbl[] = …;

static const struct xe_step_info dg2_g11_revid_step_tbl[] = …;

static const struct xe_step_info dg2_g12_revid_step_tbl[] = …;

static const struct xe_step_info pvc_revid_step_tbl[] = …;

static const int pvc_basedie_subids[] = …;

__diag_pop();

/**
 * xe_step_pre_gmdid_get - Determine IP steppings from PCI revid
 * @xe: Xe device
 *
 * Convert the PCI revid into proper IP steppings.  This should only be
 * used on platforms that do not have GMD_ID support.
 */
struct xe_step_info xe_step_pre_gmdid_get(struct xe_device *xe)
{ … }

/**
 * xe_step_gmdid_get - Determine IP steppings from GMD_ID revid fields
 * @xe: Xe device
 * @graphics_gmdid_revid: value of graphics GMD_ID register's revid field
 * @media_gmdid_revid: value of media GMD_ID register's revid field
 *
 * Convert the revid fields of the GMD_ID registers into proper IP steppings.
 *
 * GMD_ID revid values are currently expected to have consistent meanings on
 * all platforms:  major steppings (A0, B0, etc.) are 4 apart, with minor
 * steppings (A1, A2, etc.) taking the values in between.
 */
struct xe_step_info xe_step_gmdid_get(struct xe_device *xe,
				      u32 graphics_gmdid_revid,
				      u32 media_gmdid_revid)
{ … }

#define STEP_NAME_CASE(name) …

const char *xe_step_name(enum xe_step step)
{ … }