drivers/gpu/drm/xe/xe_mocs.c

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

#include "xe_mocs.h"

#include "regs/xe_gt_regs.h"
#include "xe_device.h"
#include "xe_exec_queue.h"
#include "xe_force_wake.h"
#include "xe_gt.h"
#include "xe_gt_mcr.h"
#include "xe_gt_printk.h"
#include "xe_mmio.h"
#include "xe_platform_types.h"
#include "xe_pm.h"
#include "xe_sriov.h"

#if IS_ENABLED(CONFIG_DRM_XE_DEBUG)
#define mocs_dbg xe_gt_dbg
#else
__printf(2, 3)
static inline void mocs_dbg(const struct xe_gt *gt,
			    const char *format, ...)
{ /* noop */ }
#endif

enum {
	HAS_GLOBAL_MOCS = BIT(0),
	HAS_LNCF_MOCS = BIT(1),
};

struct xe_mocs_entry {
	u32 control_value;
	u16 l3cc_value;
	u16 used;
};

struct xe_mocs_info;

struct xe_mocs_ops {
	void (*dump)(struct xe_mocs_info *mocs, unsigned int flags,
		     struct xe_gt *gt, struct drm_printer *p);
};

struct xe_mocs_info {
	/*
	 * Size of the spec's suggested MOCS programming table.  The list of
	 * table entries from the spec can potentially be smaller than the
	 * number of hardware registers used to program the MOCS table; in such
	 * cases the registers for the remaining indices will be programmed to
	 * match unused_entries_index.
	 */
	unsigned int table_size;
	/* Number of MOCS entries supported by the hardware */
	unsigned int num_mocs_regs;
	const struct xe_mocs_entry *table;
	const struct xe_mocs_ops *ops;
	u8 uc_index;
	u8 wb_index;
	u8 unused_entries_index;
};

/* Defines for the tables (GLOB_MOCS_0 - GLOB_MOCS_16) */
#define IG_PAT				REG_BIT(8)
#define L3_CACHE_POLICY_MASK		REG_GENMASK(5, 4)
#define L4_CACHE_POLICY_MASK		REG_GENMASK(3, 2)

/* Helper defines */
#define XELP_NUM_MOCS_ENTRIES	64  /* 63-64 are reserved, but configured. */
#define PVC_NUM_MOCS_ENTRIES	3
#define MTL_NUM_MOCS_ENTRIES	16
#define XE2_NUM_MOCS_ENTRIES	16

/* (e)LLC caching options */
/*
 * Note: LE_0_PAGETABLE works only up to Gen11; for newer gens it means
 * the same as LE_UC
 */
#define LE_0_PAGETABLE		LE_CACHEABILITY(0)
#define LE_1_UC			LE_CACHEABILITY(1)
#define LE_2_WT			LE_CACHEABILITY(2)
#define LE_3_WB			LE_CACHEABILITY(3)

/* Target cache */
#define LE_TC_0_PAGETABLE	LE_TGT_CACHE(0)
#define LE_TC_1_LLC		LE_TGT_CACHE(1)
#define LE_TC_2_LLC_ELLC	LE_TGT_CACHE(2)
#define LE_TC_3_LLC_ELLC_ALT	LE_TGT_CACHE(3)

/* L3 caching options */
#define L3_0_DIRECT		L3_CACHEABILITY(0)
#define L3_1_UC			L3_CACHEABILITY(1)
#define L3_2_RESERVED		L3_CACHEABILITY(2)
#define L3_3_WB			L3_CACHEABILITY(3)

/* L4 caching options */
#define L4_0_WB                 REG_FIELD_PREP(L4_CACHE_POLICY_MASK, 0)
#define L4_1_WT                 REG_FIELD_PREP(L4_CACHE_POLICY_MASK, 1)
#define L4_3_UC                 REG_FIELD_PREP(L4_CACHE_POLICY_MASK, 3)

#define XE2_L3_0_WB		REG_FIELD_PREP(L3_CACHE_POLICY_MASK, 0)
/* XD: WB Transient Display */
#define XE2_L3_1_XD		REG_FIELD_PREP(L3_CACHE_POLICY_MASK, 1)
#define XE2_L3_3_UC		REG_FIELD_PREP(L3_CACHE_POLICY_MASK, 3)

#define XE2_L3_CLOS_MASK	REG_GENMASK(7, 6)

#define MOCS_ENTRY(__idx, __control_value, __l3cc_value) \
	[__idx] = { \
		.control_value = __control_value, \
		.l3cc_value = __l3cc_value, \
		.used = 1, \
	}

/*
 * MOCS tables
 *
 * These are the MOCS tables that are programmed across all the rings.
 * The control value is programmed to all the rings that support the
 * MOCS registers. While the l3cc_values are only programmed to the
 * LNCFCMOCS0 - LNCFCMOCS32 registers.
 *
 * These tables are intended to be kept reasonably consistent across
 * HW platforms, and for ICL+, be identical across OSes. To achieve
 * that, the list of entries is published as part of bspec.
 *
 * Entries not part of the following tables are undefined as far as userspace is
 * concerned and shouldn't be relied upon. The last few entries are reserved by
 * the hardware. They should be initialized according to bspec and never used.
 *
 * NOTE1: These tables are part of bspec and defined as part of the hardware
 * interface. It is expected that, for specific hardware platform, existing
 * entries will remain constant and the table will only be updated by adding new
 * entries, filling unused positions.
 *
 * NOTE2: Reserved and unspecified MOCS indices have been set to L3 WB. These
 * reserved entries should never be used. They may be changed to low performant
 * variants with better coherency in the future if more entries are needed.
 */

static const struct xe_mocs_entry gen12_mocs_desc[] = {
	/* Base - L3 + LLC */
	MOCS_ENTRY(2,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3),
		   L3_3_WB),
	/* Base - Uncached */
	MOCS_ENTRY(3,
		   LE_1_UC | LE_TC_1_LLC,
		   L3_1_UC),
	/* Base - L3 */
	MOCS_ENTRY(4,
		   LE_1_UC | LE_TC_1_LLC,
		   L3_3_WB),
	/* Base - LLC */
	MOCS_ENTRY(5,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3),
		   L3_1_UC),
	/* Age 0 - LLC */
	MOCS_ENTRY(6,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(1),
		   L3_1_UC),
	/* Age 0 - L3 + LLC */
	MOCS_ENTRY(7,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(1),
		   L3_3_WB),
	/* Age: Don't Chg. - LLC */
	MOCS_ENTRY(8,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(2),
		   L3_1_UC),
	/* Age: Don't Chg. - L3 + LLC */
	MOCS_ENTRY(9,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(2),
		   L3_3_WB),
	/* No AOM - LLC */
	MOCS_ENTRY(10,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3) | LE_AOM(1),
		   L3_1_UC),
	/* No AOM - L3 + LLC */
	MOCS_ENTRY(11,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3) | LE_AOM(1),
		   L3_3_WB),
	/* No AOM; Age 0 - LLC */
	MOCS_ENTRY(12,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(1) | LE_AOM(1),
		   L3_1_UC),
	/* No AOM; Age 0 - L3 + LLC */
	MOCS_ENTRY(13,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(1) | LE_AOM(1),
		   L3_3_WB),
	/* No AOM; Age:DC - LLC */
	MOCS_ENTRY(14,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(2) | LE_AOM(1),
		   L3_1_UC),
	/* No AOM; Age:DC - L3 + LLC */
	MOCS_ENTRY(15,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(2) | LE_AOM(1),
		   L3_3_WB),
	/* Self-Snoop - L3 + LLC */
	MOCS_ENTRY(18,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3) | LE_SSE(3),
		   L3_3_WB),
	/* Skip Caching - L3 + LLC(12.5%) */
	MOCS_ENTRY(19,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3) | LE_SCC(7),
		   L3_3_WB),
	/* Skip Caching - L3 + LLC(25%) */
	MOCS_ENTRY(20,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3) | LE_SCC(3),
		   L3_3_WB),
	/* Skip Caching - L3 + LLC(50%) */
	MOCS_ENTRY(21,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3) | LE_SCC(1),
		   L3_3_WB),
	/* Skip Caching - L3 + LLC(75%) */
	MOCS_ENTRY(22,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3) | LE_RSC(1) | LE_SCC(3),
		   L3_3_WB),
	/* Skip Caching - L3 + LLC(87.5%) */
	MOCS_ENTRY(23,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3) | LE_RSC(1) | LE_SCC(7),
		   L3_3_WB),
	/* Implicitly enable L1 - HDC:L1 + L3 + LLC */
	MOCS_ENTRY(48,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3),
		   L3_3_WB),
	/* Implicitly enable L1 - HDC:L1 + L3 */
	MOCS_ENTRY(49,
		   LE_1_UC | LE_TC_1_LLC,
		   L3_3_WB),
	/* Implicitly enable L1 - HDC:L1 + LLC */
	MOCS_ENTRY(50,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3),
		   L3_1_UC),
	/* Implicitly enable L1 - HDC:L1 */
	MOCS_ENTRY(51,
		   LE_1_UC | LE_TC_1_LLC,
		   L3_1_UC),
	/* HW Special Case (CCS) */
	MOCS_ENTRY(60,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3),
		   L3_1_UC),
	/* HW Special Case (Displayable) */
	MOCS_ENTRY(61,
		   LE_1_UC | LE_TC_1_LLC,
		   L3_3_WB),
	/* HW Reserved - SW program but never use */
	MOCS_ENTRY(62,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3),
		   L3_1_UC),
	/* HW Reserved - SW program but never use */
	MOCS_ENTRY(63,
		   LE_3_WB | LE_TC_1_LLC | LE_LRUM(3),
		   L3_1_UC)
};

static bool regs_are_mcr(struct xe_gt *gt)
{
	struct xe_device *xe = gt_to_xe(gt);

	if (xe_gt_is_media_type(gt))
		return MEDIA_VER(xe) >= 20;
	else
		return GRAPHICS_VERx100(xe) >= 1250;
}

static void xelp_lncf_dump(struct xe_mocs_info *info, struct xe_gt *gt, struct drm_printer *p)
{
	unsigned int i, j;
	u32 reg_val;

	drm_printf(p, "LNCFCMOCS[idx] = [ESC, SCC, L3CC] (value)\n\n");

	for (i = 0, j = 0; i < (info->num_mocs_regs + 1) / 2; i++, j++) {
		if (regs_are_mcr(gt))
			reg_val = xe_gt_mcr_unicast_read_any(gt, XEHP_LNCFCMOCS(i));
		else
			reg_val = xe_mmio_read32(&gt->mmio, XELP_LNCFCMOCS(i));

		drm_printf(p, "LNCFCMOCS[%2d] = [%u, %u, %u] (%#8x)\n",
			   j++,
			   !!(reg_val & L3_ESC_MASK),
			   REG_FIELD_GET(L3_SCC_MASK, reg_val),
			   REG_FIELD_GET(L3_CACHEABILITY_MASK, reg_val),
			   reg_val);

		drm_printf(p, "LNCFCMOCS[%2d] = [%u, %u, %u] (%#8x)\n",
			   j,
			   !!(reg_val & L3_UPPER_IDX_ESC_MASK),
			   REG_FIELD_GET(L3_UPPER_IDX_SCC_MASK, reg_val),
			   REG_FIELD_GET(L3_UPPER_IDX_CACHEABILITY_MASK, reg_val),
			   reg_val);
	}
}

static void xelp_mocs_dump(struct xe_mocs_info *info, unsigned int flags,
			   struct xe_gt *gt, struct drm_printer *p)
{
	unsigned int i;
	u32 reg_val;

	if (flags & HAS_GLOBAL_MOCS) {
		drm_printf(p, "Global mocs table configuration:\n");
		drm_printf(p, "GLOB_MOCS[idx] = [LeCC, TC, LRUM, AOM, RSC, SCC, PFM, SCF, CoS, SSE] (value)\n\n");

		for (i = 0; i < info->num_mocs_regs; i++) {
			if (regs_are_mcr(gt))
				reg_val = xe_gt_mcr_unicast_read_any(gt, XEHP_GLOBAL_MOCS(i));
			else
				reg_val = xe_mmio_read32(&gt->mmio, XELP_GLOBAL_MOCS(i));

			drm_printf(p, "GLOB_MOCS[%2d] = [%u, %u, %u, %u, %u, %u, %u, %u, %u, %u ] (%#8x)\n",
				   i,
				   REG_FIELD_GET(LE_CACHEABILITY_MASK, reg_val),
				   REG_FIELD_GET(LE_TGT_CACHE_MASK, reg_val),
				   REG_FIELD_GET(LE_LRUM_MASK, reg_val),
				   !!(reg_val & LE_AOM_MASK),
				   !!(reg_val & LE_RSC_MASK),
				   REG_FIELD_GET(LE_SCC_MASK, reg_val),
				   REG_FIELD_GET(LE_PFM_MASK, reg_val),
				   !!(reg_val & LE_SCF_MASK),
				   REG_FIELD_GET(LE_COS_MASK, reg_val),
				   REG_FIELD_GET(LE_SSE_MASK, reg_val),
				   reg_val);
		}
	}

	xelp_lncf_dump(info, gt, p);
}

static const struct xe_mocs_ops xelp_mocs_ops = {
	.dump = xelp_mocs_dump,
};

static const struct xe_mocs_entry dg1_mocs_desc[] = {
	/* UC */
	MOCS_ENTRY(1, 0, L3_1_UC),
	/* WB - L3 */
	MOCS_ENTRY(5, 0, L3_3_WB),
	/* WB - L3 50% */
	MOCS_ENTRY(6, 0, L3_ESC(1) | L3_SCC(1) | L3_3_WB),
	/* WB - L3 25% */
	MOCS_ENTRY(7, 0, L3_ESC(1) | L3_SCC(3) | L3_3_WB),
	/* WB - L3 12.5% */
	MOCS_ENTRY(8, 0, L3_ESC(1) | L3_SCC(7) | L3_3_WB),

	/* HDC:L1 + L3 */
	MOCS_ENTRY(48, 0, L3_3_WB),
	/* HDC:L1 */
	MOCS_ENTRY(49, 0, L3_1_UC),

	/* HW Reserved */
	MOCS_ENTRY(60, 0, L3_1_UC),
	MOCS_ENTRY(61, 0, L3_1_UC),
	MOCS_ENTRY(62, 0, L3_1_UC),
	MOCS_ENTRY(63, 0, L3_1_UC),
};

static const struct xe_mocs_entry dg2_mocs_desc[] = {
	/* UC - Coherent; GO:L3 */
	MOCS_ENTRY(0, 0, L3_1_UC | L3_LKUP(1)),
	/* UC - Coherent; GO:Memory */
	MOCS_ENTRY(1, 0, L3_1_UC | L3_GLBGO(1) | L3_LKUP(1)),
	/* UC - Non-Coherent; GO:Memory */
	MOCS_ENTRY(2, 0, L3_1_UC | L3_GLBGO(1)),

	/* WB - LC */
	MOCS_ENTRY(3, 0, L3_3_WB | L3_LKUP(1)),
};

static void xehp_lncf_dump(struct xe_mocs_info *info, unsigned int flags,
			   struct xe_gt *gt, struct drm_printer *p)
{
	unsigned int i, j;
	u32 reg_val;

	drm_printf(p, "LNCFCMOCS[idx] = [UCL3LOOKUP, GLBGO, L3CC] (value)\n\n");

	for (i = 0, j = 0; i < (info->num_mocs_regs + 1) / 2; i++, j++) {
		if (regs_are_mcr(gt))
			reg_val = xe_gt_mcr_unicast_read_any(gt, XEHP_LNCFCMOCS(i));
		else
			reg_val = xe_mmio_read32(&gt->mmio, XELP_LNCFCMOCS(i));

		drm_printf(p, "LNCFCMOCS[%2d] = [%u, %u, %u] (%#8x)\n",
			   j++,
			   !!(reg_val & L3_LKUP_MASK),
			   !!(reg_val & L3_GLBGO_MASK),
			   REG_FIELD_GET(L3_CACHEABILITY_MASK, reg_val),
			   reg_val);

		drm_printf(p, "LNCFCMOCS[%2d] = [%u, %u, %u] (%#8x)\n",
			   j,
			   !!(reg_val & L3_UPPER_LKUP_MASK),
			   !!(reg_val & L3_UPPER_GLBGO_MASK),
			   REG_FIELD_GET(L3_UPPER_IDX_CACHEABILITY_MASK, reg_val),
			   reg_val);
	}
}

static const struct xe_mocs_ops xehp_mocs_ops = {
	.dump = xehp_lncf_dump,
};

static const struct xe_mocs_entry pvc_mocs_desc[] = {
	/* Error */
	MOCS_ENTRY(0, 0, L3_3_WB),

	/* UC */
	MOCS_ENTRY(1, 0, L3_1_UC),

	/* WB */
	MOCS_ENTRY(2, 0, L3_3_WB),
};

static void pvc_mocs_dump(struct xe_mocs_info *info, unsigned int flags, struct xe_gt *gt,
			  struct drm_printer *p)
{
	unsigned int i, j;
	u32 reg_val;

	drm_printf(p, "LNCFCMOCS[idx] = [ L3CC ] (value)\n\n");

	for (i = 0, j = 0; i < (info->num_mocs_regs + 1) / 2; i++, j++) {
		if (regs_are_mcr(gt))
			reg_val = xe_gt_mcr_unicast_read_any(gt, XEHP_LNCFCMOCS(i));
		else
			reg_val = xe_mmio_read32(&gt->mmio, XELP_LNCFCMOCS(i));

		drm_printf(p, "LNCFCMOCS[%2d] = [ %u ] (%#8x)\n",
			   j++,
			   REG_FIELD_GET(L3_CACHEABILITY_MASK, reg_val),
			   reg_val);

		drm_printf(p, "LNCFCMOCS[%2d] = [ %u ] (%#8x)\n",
			   j,
			   REG_FIELD_GET(L3_UPPER_IDX_CACHEABILITY_MASK, reg_val),
			   reg_val);
	}
}

static const struct xe_mocs_ops pvc_mocs_ops = {
	.dump = pvc_mocs_dump,
};

static const struct xe_mocs_entry mtl_mocs_desc[] = {
	/* Error - Reserved for Non-Use */
	MOCS_ENTRY(0,
		   0,
		   L3_LKUP(1) | L3_3_WB),
	/* Cached - L3 + L4 */
	MOCS_ENTRY(1,
		   IG_PAT,
		   L3_LKUP(1) | L3_3_WB),
	/* L4 - GO:L3 */
	MOCS_ENTRY(2,
		   IG_PAT,
		   L3_LKUP(1) | L3_1_UC),
	/* Uncached - GO:L3 */
	MOCS_ENTRY(3,
		   IG_PAT | L4_3_UC,
		   L3_LKUP(1) | L3_1_UC),
	/* L4 - GO:Mem */
	MOCS_ENTRY(4,
		   IG_PAT,
		   L3_LKUP(1) | L3_GLBGO(1) | L3_1_UC),
	/* Uncached - GO:Mem */
	MOCS_ENTRY(5,
		   IG_PAT | L4_3_UC,
		   L3_LKUP(1) | L3_GLBGO(1) | L3_1_UC),
	/* L4 - L3:NoLKUP; GO:L3 */
	MOCS_ENTRY(6,
		   IG_PAT,
		   L3_1_UC),
	/* Uncached - L3:NoLKUP; GO:L3 */
	MOCS_ENTRY(7,
		   IG_PAT | L4_3_UC,
		   L3_1_UC),
	/* L4 - L3:NoLKUP; GO:Mem */
	MOCS_ENTRY(8,
		   IG_PAT,
		   L3_GLBGO(1) | L3_1_UC),
	/* Uncached - L3:NoLKUP; GO:Mem */
	MOCS_ENTRY(9,
		   IG_PAT | L4_3_UC,
		   L3_GLBGO(1) | L3_1_UC),
	/* Display - L3; L4:WT */
	MOCS_ENTRY(14,
		   IG_PAT | L4_1_WT,
		   L3_LKUP(1) | L3_3_WB),
	/* CCS - Non-Displayable */
	MOCS_ENTRY(15,
		   IG_PAT,
		   L3_GLBGO(1) | L3_1_UC),
};

static void mtl_mocs_dump(struct xe_mocs_info *info, unsigned int flags,
			  struct xe_gt *gt, struct drm_printer *p)
{
	unsigned int i;
	u32 reg_val;

	drm_printf(p, "Global mocs table configuration:\n");
	drm_printf(p, "GLOB_MOCS[idx] = [IG_PAT, L4_CACHE_POLICY] (value)\n\n");

	for (i = 0; i < info->num_mocs_regs; i++) {
		if (regs_are_mcr(gt))
			reg_val = xe_gt_mcr_unicast_read_any(gt, XEHP_GLOBAL_MOCS(i));
		else
			reg_val = xe_mmio_read32(&gt->mmio, XELP_GLOBAL_MOCS(i));

		drm_printf(p, "GLOB_MOCS[%2d] = [%u, %u]  (%#8x)\n",
			   i,
			   !!(reg_val & IG_PAT),
			   REG_FIELD_GET(L4_CACHE_POLICY_MASK, reg_val),
			   reg_val);
	}

	/* MTL lncf mocs table pattern is similar to that of xehp */
	xehp_lncf_dump(info, flags, gt, p);
}

static const struct xe_mocs_ops mtl_mocs_ops = {
	.dump = mtl_mocs_dump,
};

static const struct xe_mocs_entry xe2_mocs_table[] = {
	/* Defer to PAT */
	MOCS_ENTRY(0, XE2_L3_0_WB | L4_3_UC, 0),
	/* Cached L3, Uncached L4 */
	MOCS_ENTRY(1, IG_PAT | XE2_L3_0_WB | L4_3_UC, 0),
	/* Uncached L3, Cached L4 */
	MOCS_ENTRY(2, IG_PAT | XE2_L3_3_UC | L4_0_WB, 0),
	/* Uncached L3 + L4 */
	MOCS_ENTRY(3, IG_PAT | XE2_L3_3_UC | L4_3_UC, 0),
	/* Cached L3 + L4 */
	MOCS_ENTRY(4, IG_PAT | XE2_L3_0_WB | L4_0_WB, 0),
};

static void xe2_mocs_dump(struct xe_mocs_info *info, unsigned int flags,
			  struct xe_gt *gt, struct drm_printer *p)
{
	unsigned int i;
	u32 reg_val;

	drm_printf(p, "Global mocs table configuration:\n");
	drm_printf(p, "GLOB_MOCS[idx] = [IG_PAT, L3_CLOS, L3_CACHE_POLICY, L4_CACHE_POLICY] (value)\n\n");

	for (i = 0; i < info->num_mocs_regs; i++) {
		if (regs_are_mcr(gt))
			reg_val = xe_gt_mcr_unicast_read_any(gt, XEHP_GLOBAL_MOCS(i));
		else
			reg_val = xe_mmio_read32(&gt->mmio, XELP_GLOBAL_MOCS(i));

		drm_printf(p, "GLOB_MOCS[%2d] = [%u, %u, %u]  (%#8x)\n",
			   i,
			   !!(reg_val & IG_PAT),
			   REG_FIELD_GET(XE2_L3_CLOS_MASK, reg_val),
			   REG_FIELD_GET(L4_CACHE_POLICY_MASK, reg_val),
			   reg_val);
	}
}

static const struct xe_mocs_ops xe2_mocs_ops = {
	.dump = xe2_mocs_dump,
};

/*
 * Note that the "L3" and "L4" register fields actually control the L2 and L3
 * caches respectively on this platform.
 */
static const struct xe_mocs_entry xe3p_xpc_mocs_table[] = {
	/* Defer to PAT */
	MOCS_ENTRY(0, XE2_L3_0_WB | L4_3_UC, 0),
	/* UC */
	MOCS_ENTRY(1, IG_PAT | XE2_L3_3_UC | L4_3_UC, 0),
	/* L2 */
	MOCS_ENTRY(2, IG_PAT | XE2_L3_0_WB | L4_3_UC, 0),
	/* L3 */
	MOCS_ENTRY(3, IG_PAT | XE2_L3_3_UC | L4_0_WB, 0),
	/* L2 + L3 */
	MOCS_ENTRY(4, IG_PAT | XE2_L3_0_WB | L4_0_WB, 0),
};

static unsigned int get_mocs_settings(struct xe_device *xe,
				      struct xe_mocs_info *info)
{
	unsigned int flags = 0;

	memset(info, 0, sizeof(struct xe_mocs_info));

	switch (xe->info.platform) {
	case XE_CRESCENTISLAND:
		info->ops = &xe2_mocs_ops;
		info->table_size = ARRAY_SIZE(xe3p_xpc_mocs_table);
		info->table = xe3p_xpc_mocs_table;
		info->num_mocs_regs = XE2_NUM_MOCS_ENTRIES;
		info->uc_index = 1;
		info->wb_index = 4;
		info->unused_entries_index = 4;
		break;
	case XE_NOVALAKE_P:
	case XE_NOVALAKE_S:
	case XE_PANTHERLAKE:
	case XE_LUNARLAKE:
	case XE_BATTLEMAGE:
		info->ops = &xe2_mocs_ops;
		info->table_size = ARRAY_SIZE(xe2_mocs_table);
		info->table = xe2_mocs_table;
		info->num_mocs_regs = XE2_NUM_MOCS_ENTRIES;
		info->uc_index = 3;
		info->wb_index = 4;
		info->unused_entries_index = 4;
		break;
	case XE_PVC:
		info->ops = &pvc_mocs_ops;
		info->table_size = ARRAY_SIZE(pvc_mocs_desc);
		info->table = pvc_mocs_desc;
		info->num_mocs_regs = PVC_NUM_MOCS_ENTRIES;
		info->uc_index = 1;
		info->wb_index = 2;
		info->unused_entries_index = 2;
		break;
	case XE_METEORLAKE:
		info->ops = &mtl_mocs_ops;
		info->table_size = ARRAY_SIZE(mtl_mocs_desc);
		info->table = mtl_mocs_desc;
		info->num_mocs_regs = MTL_NUM_MOCS_ENTRIES;
		info->uc_index = 9;
		info->unused_entries_index = 1;
		break;
	case XE_DG2:
		info->ops = &xehp_mocs_ops;
		info->table_size = ARRAY_SIZE(dg2_mocs_desc);
		info->table = dg2_mocs_desc;
		info->uc_index = 1;
		/*
		 * Last entry is RO on hardware, don't bother with what was
		 * written when checking later
		 */
		info->num_mocs_regs = XELP_NUM_MOCS_ENTRIES - 1;
		info->unused_entries_index = 3;
		break;
	case XE_DG1:
		info->ops = &xelp_mocs_ops;
		info->table_size = ARRAY_SIZE(dg1_mocs_desc);
		info->table = dg1_mocs_desc;
		info->uc_index = 1;
		info->num_mocs_regs = XELP_NUM_MOCS_ENTRIES;
		info->unused_entries_index = 5;
		break;
	case XE_TIGERLAKE:
	case XE_ROCKETLAKE:
	case XE_ALDERLAKE_S:
	case XE_ALDERLAKE_P:
	case XE_ALDERLAKE_N:
		info->ops = &xelp_mocs_ops;
		info->table_size  = ARRAY_SIZE(gen12_mocs_desc);
		info->table = gen12_mocs_desc;
		info->num_mocs_regs = XELP_NUM_MOCS_ENTRIES;
		info->uc_index = 3;
		info->unused_entries_index = 2;
		break;
	default:
		drm_err(&xe->drm, "Platform that should have a MOCS table does not.\n");
		return 0;
	}

	/*
	 * Index 0 is a reserved/unused table entry on most platforms, but
	 * even on those where it does represent a legitimate MOCS entry, it
	 * never represents the "most cached, least coherent" behavior we want
	 * to populate undefined table rows with.  So if unused_entries_index
	 * is still 0 at this point, we'll assume that it was omitted by
	 * mistake in the switch statement above.
	 */
	xe_assert(xe, info->unused_entries_index != 0);

	xe_assert(xe, info->ops && info->ops->dump);
	xe_assert(xe, info->table_size <= info->num_mocs_regs);

	if (!IS_DGFX(xe) || GRAPHICS_VER(xe) >= 20)
		flags |= HAS_GLOBAL_MOCS;
	if (GRAPHICS_VER(xe) < 20)
		flags |= HAS_LNCF_MOCS;

	return flags;
}

/*
 * Get control_value from MOCS entry.  If the table entry is not defined, the
 * settings from unused_entries_index will be returned.
 */
static u32 get_entry_control(const struct xe_mocs_info *info,
			     unsigned int index)
{
	if (index < info->table_size && info->table[index].used)
		return info->table[index].control_value;
	return info->table[info->unused_entries_index].control_value;
}

static void __init_mocs_table(struct xe_gt *gt,
			      const struct xe_mocs_info *info)
{
	unsigned int i;
	u32 mocs;

	mocs_dbg(gt, "mocs entries: %d\n", info->num_mocs_regs);

	for (i = 0; i < info->num_mocs_regs; i++) {
		mocs = get_entry_control(info, i);

		mocs_dbg(gt, "GLOB_MOCS[%d] 0x%x 0x%x\n", i,
			 XELP_GLOBAL_MOCS(i).addr, mocs);

		if (regs_are_mcr(gt))
			xe_gt_mcr_multicast_write(gt, XEHP_GLOBAL_MOCS(i), mocs);
		else
			xe_mmio_write32(&gt->mmio, XELP_GLOBAL_MOCS(i), mocs);
	}
}

/*
 * Get l3cc_value from MOCS entry taking into account when it's not used
 * then if unused_entries_index is not zero then its value will be returned
 * otherwise I915_MOCS_PTE's value is returned in this case.
 */
static u16 get_entry_l3cc(const struct xe_mocs_info *info,
			  unsigned int index)
{
	if (index < info->table_size && info->table[index].used)
		return info->table[index].l3cc_value;
	return info->table[info->unused_entries_index].l3cc_value;
}

static u32 l3cc_combine(u16 low, u16 high)
{
	return low | (u32)high << 16;
}

static void init_l3cc_table(struct xe_gt *gt,
			    const struct xe_mocs_info *info)
{
	unsigned int i;
	u32 l3cc;

	mocs_dbg(gt, "l3cc entries: %d\n", info->num_mocs_regs);

	for (i = 0; i < (info->num_mocs_regs + 1) / 2; i++) {
		l3cc = l3cc_combine(get_entry_l3cc(info, 2 * i),
				    get_entry_l3cc(info, 2 * i + 1));

		mocs_dbg(gt, "LNCFCMOCS[%d] 0x%x 0x%x\n", i,
			 XELP_LNCFCMOCS(i).addr, l3cc);

		if (regs_are_mcr(gt))
			xe_gt_mcr_multicast_write(gt, XEHP_LNCFCMOCS(i), l3cc);
		else
			xe_mmio_write32(&gt->mmio, XELP_LNCFCMOCS(i), l3cc);
	}
}

void xe_mocs_init_early(struct xe_gt *gt)
{
	struct xe_mocs_info table;

	get_mocs_settings(gt_to_xe(gt), &table);
	gt->mocs.uc_index = table.uc_index;
	gt->mocs.wb_index = table.wb_index;
}

void xe_mocs_init(struct xe_gt *gt)
{
	struct xe_mocs_info table;
	unsigned int flags;

	if (IS_SRIOV_VF(gt_to_xe(gt)))
		return;

	/*
	 * MOCS settings are split between "GLOB_MOCS" and/or "LNCFCMOCS"
	 * registers depending on platform.
	 *
	 * These registers should be programmed before GuC initialization
	 * since their values will affect some of the memory transactions
	 * performed by the GuC.
	 */
	flags = get_mocs_settings(gt_to_xe(gt), &table);
	mocs_dbg(gt, "flag:0x%x\n", flags);

	if (IS_SRIOV_VF(gt_to_xe(gt)))
		return;

	if (flags & HAS_GLOBAL_MOCS)
		__init_mocs_table(gt, &table);
	if (flags & HAS_LNCF_MOCS)
		init_l3cc_table(gt, &table);
}

/**
 * xe_mocs_dump() - Dump MOCS table.
 * @gt: the &xe_gt with MOCS table
 * @p: the &drm_printer to dump info to
 *
 * Return: 0 on success or a negative error code on failure.
 */
int xe_mocs_dump(struct xe_gt *gt, struct drm_printer *p)
{
	struct xe_device *xe = gt_to_xe(gt);
	enum xe_force_wake_domains domain;
	struct xe_mocs_info table;
	unsigned int flags;

	flags = get_mocs_settings(xe, &table);

	domain = flags & HAS_LNCF_MOCS ? XE_FORCEWAKE_ALL : XE_FW_GT;

	guard(xe_pm_runtime_noresume)(xe);
	CLASS(xe_force_wake, fw_ref)(gt_to_fw(gt), domain);
	if (!xe_force_wake_ref_has_domain(fw_ref.domains, domain))
		return -ETIMEDOUT;

	table.ops->dump(&table, flags, gt, p);

	return 0;
}

#if IS_ENABLED(CONFIG_DRM_XE_KUNIT_TEST)
#include "tests/xe_mocs.c"
#endif