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/*

 * Copyright (c) 2015 Intel Corporation

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions: *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 */

#include "intel_mocs.h"

#include "intel_lrc.h"

#include "intel_ringbuffer.h"

/* structures required */

struct drm_i915_mocs_entry {

	u32 control_value;

	u16 l3cc_value;

};

struct drm_i915_mocs_table {

	u32 size;

	const struct drm_i915_mocs_entry *table;

};

/* Defines for the tables (XXX_MOCS_0 - XXX_MOCS_63) */

#define LE_CACHEABILITY(value)	((value) << 0)

#define LE_TGT_CACHE(value)	((value) << 2)

#define LE_LRUM(value)		((value) << 4)

#define LE_AOM(value)		((value) << 6)

#define LE_RSC(value)		((value) << 7)

#define LE_SCC(value)		((value) << 8)

#define LE_PFM(value)		((value) << 11)

#define LE_SCF(value)		((value) << 14)

/* Defines for the tables (LNCFMOCS0 - LNCFMOCS31) - two entries per word */

#define L3_ESC(value)		((value) << 0)

#define L3_SCC(value)		((value) << 1)

#define L3_CACHEABILITY(value)	((value) << 4)

/* Helper defines */

#define GEN9_NUM_MOCS_ENTRIES	62  /* 62 out of 64 - 63 & 64 are reserved. */

/* (e)LLC caching options */

#define LE_PAGETABLE		0

#define LE_UC			1

#define LE_WT			2

#define LE_WB			3

/* L3 caching options */

#define L3_DIRECT		0

#define L3_UC			1

#define L3_RESERVED		2

#define L3_WB			3

/* Target cache */

#define ELLC			0

#define LLC			1

#define LLC_ELLC		2

/*

 * 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

 * platforms. However some of the fields are not applicable to all of

 * them.

 *

 * Entries not part of the following tables are undefined as far as

 * userspace is concerned and shouldn't be relied upon.  For the time

 * being they will be implicitly initialized to the strictest caching

 * configuration (uncached) to guarantee forwards compatibility with

 * userspace programs written against more recent kernels providing

 * additional MOCS entries.

 *

 * NOTE: These tables MUST start with being uncached and the length

 *       MUST be less than 63 as the last two registers are reserved

 *       by the hardware.  These tables are part of the kernel ABI and

 *       may only be updated incrementally by adding entries at the

 *       end.

 */

static const struct drm_i915_mocs_entry skylake_mocs_table[] = {

	/* { 0x00000009, 0x0010 } */

	{ (LE_CACHEABILITY(LE_UC) | LE_TGT_CACHE(LLC_ELLC) | LE_LRUM(0) |

	   LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | LE_PFM(0) | LE_SCF(0)),

	  (L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC)) },

	/* { 0x00000038, 0x0030 } */

	{ (LE_CACHEABILITY(LE_PAGETABLE) | LE_TGT_CACHE(LLC_ELLC) | LE_LRUM(3) |

	   LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | LE_PFM(0) | LE_SCF(0)),

	  (L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB)) },

	/* { 0x0000003b, 0x0030 } */

	{ (LE_CACHEABILITY(LE_WB) | LE_TGT_CACHE(LLC_ELLC) | LE_LRUM(3) |

	   LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | LE_PFM(0) | LE_SCF(0)),

	  (L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB)) }

};

/* NOTE: the LE_TGT_CACHE is not used on Broxton */

static const struct drm_i915_mocs_entry broxton_mocs_table[] = {

	/* { 0x00000009, 0x0010 } */

	{ (LE_CACHEABILITY(LE_UC) | LE_TGT_CACHE(LLC_ELLC) | LE_LRUM(0) |

	   LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | LE_PFM(0) | LE_SCF(0)),

	  (L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC)) },

	/* { 0x00000038, 0x0030 } */

	{ (LE_CACHEABILITY(LE_PAGETABLE) | LE_TGT_CACHE(LLC_ELLC) | LE_LRUM(3) |

	   LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | LE_PFM(0) | LE_SCF(0)),

	  (L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB)) },

	/* { 0x0000003b, 0x0030 } */

	{ (LE_CACHEABILITY(LE_WB) | LE_TGT_CACHE(LLC_ELLC) | LE_LRUM(3) |

	   LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | LE_PFM(0) | LE_SCF(0)),

	  (L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB)) }

};

/**

 * get_mocs_settings()

 * @dev:        DRM device.

 * @table:      Output table that will be made to point at appropriate

 *              MOCS values for the device.

 *

 * This function will return the values of the MOCS table that needs to

 * be programmed for the platform. It will return the values that need

 * to be programmed and if they need to be programmed.

 *

 * Return: true if there are applicable MOCS settings for the device.

 */

static bool get_mocs_settings(struct drm_device *dev,

			      struct drm_i915_mocs_table *table)

{

	bool result = false;

	if (IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) {

		table->size  = ARRAY_SIZE(skylake_mocs_table);

		table->table = skylake_mocs_table;

		result = true;

	} else if (IS_BROXTON(dev)) {

		table->size  = ARRAY_SIZE(broxton_mocs_table);

		table->table = broxton_mocs_table;

		result = true;

	} else {

		WARN_ONCE(INTEL_INFO(dev)->gen >= 9,

			  "Platform that should have a MOCS table does not.\n");

	}

	return result;

}

static i915_reg_t mocs_register(enum intel_ring_id ring, int index)

{

	switch (ring) {

	case RCS:

		return GEN9_GFX_MOCS(index);

	case VCS:

		return GEN9_MFX0_MOCS(index);

	case BCS:

		return GEN9_BLT_MOCS(index);

	case VECS:

		return GEN9_VEBOX_MOCS(index);

	case VCS2:

		return GEN9_MFX1_MOCS(index);

	default:

		MISSING_CASE(ring);

		return INVALID_MMIO_REG;

	}

}

/**

 * emit_mocs_control_table() - emit the mocs control table

 * @req:	Request to set up the MOCS table for.

 * @table:	The values to program into the control regs.

 * @ring:	The engine for whom to emit the registers.

 *

 * This function simply emits a MI_LOAD_REGISTER_IMM command for the

 * given table starting at the given address.

 *

 * Return: 0 on success, otherwise the error status.

 */

static int emit_mocs_control_table(struct drm_i915_gem_request *req,

				   const struct drm_i915_mocs_table *table,

				   enum intel_ring_id ring)

{

	struct intel_ringbuffer *ringbuf = req->ringbuf;

	unsigned int index;

	int ret;

	if (WARN_ON(table->size > GEN9_NUM_MOCS_ENTRIES))

		return -ENODEV;

	ret = intel_logical_ring_begin(req, 2 + 2 * GEN9_NUM_MOCS_ENTRIES);

	if (ret) {

		DRM_DEBUG("intel_logical_ring_begin failed %d\n", ret);

		return ret;

	}

	intel_logical_ring_emit(ringbuf,

				MI_LOAD_REGISTER_IMM(GEN9_NUM_MOCS_ENTRIES));

	for (index = 0; index < table->size; index++) {

		intel_logical_ring_emit_reg(ringbuf, mocs_register(ring, index));

		intel_logical_ring_emit(ringbuf,

					table->table[index].control_value);

	}

	/*

	 * Ok, now set the unused entries to uncached. These entries

	 * are officially undefined and no contract for the contents

	 * and settings is given for these entries.

	 *

	 * Entry 0 in the table is uncached - so we are just writing

	 * that value to all the used entries.

	 */

	for (; index < GEN9_NUM_MOCS_ENTRIES; index++) {

		intel_logical_ring_emit_reg(ringbuf, mocs_register(ring, index));

		intel_logical_ring_emit(ringbuf, table->table[0].control_value);

	}

	intel_logical_ring_emit(ringbuf, MI_NOOP);

	intel_logical_ring_advance(ringbuf);

	return 0;

}

/**

 * emit_mocs_l3cc_table() - emit the mocs control table

 * @req:	Request to set up the MOCS table for.

 * @table:	The values to program into the control regs.

 *

 * This function simply emits a MI_LOAD_REGISTER_IMM command for the

 * given table starting at the given address. This register set is

 * programmed in pairs.

 *

 * Return: 0 on success, otherwise the error status.

 */

static int emit_mocs_l3cc_table(struct drm_i915_gem_request *req,

				const struct drm_i915_mocs_table *table)

{

	struct intel_ringbuffer *ringbuf = req->ringbuf;

	unsigned int count;

	unsigned int i;

	u32 value;

	u32 filler = (table->table[0].l3cc_value & 0xffff) |

			((table->table[0].l3cc_value & 0xffff) << 16);

	int ret;

	if (WARN_ON(table->size > GEN9_NUM_MOCS_ENTRIES))

		return -ENODEV;

	ret = intel_logical_ring_begin(req, 2 + GEN9_NUM_MOCS_ENTRIES);

	if (ret) {

		DRM_DEBUG("intel_logical_ring_begin failed %d\n", ret);

		return ret;

	}

	intel_logical_ring_emit(ringbuf,

			MI_LOAD_REGISTER_IMM(GEN9_NUM_MOCS_ENTRIES / 2));

	for (i = 0, count = 0; i < table->size / 2; i++, count += 2) {

		value = (table->table[count].l3cc_value & 0xffff) |

			((table->table[count + 1].l3cc_value & 0xffff) << 16);

		intel_logical_ring_emit_reg(ringbuf, GEN9_LNCFCMOCS(i));

		intel_logical_ring_emit(ringbuf, value);

	}

	if (table->size & 0x01) {

		/* Odd table size - 1 left over */

		value = (table->table[count].l3cc_value & 0xffff) |

			((table->table[0].l3cc_value & 0xffff) << 16);

	} else

		value = filler;

	/*

	 * Now set the rest of the table to uncached - use entry 0 as

	 * this will be uncached. Leave the last pair uninitialised as

	 * they are reserved by the hardware.

	 */

	for (; i < GEN9_NUM_MOCS_ENTRIES / 2; i++) {

		intel_logical_ring_emit_reg(ringbuf, GEN9_LNCFCMOCS(i));

		intel_logical_ring_emit(ringbuf, value);

		value = filler;

	}

	intel_logical_ring_emit(ringbuf, MI_NOOP);

	intel_logical_ring_advance(ringbuf);

	return 0;

}

/**

 * intel_rcs_context_init_mocs() - program the MOCS register.

 * @req:	Request to set up the MOCS tables for.

 *

 * This function will emit a batch buffer with the values required for

 * programming the MOCS register values for all the currently supported

 * rings.

 *

 * These registers are partially stored in the RCS context, so they are

 * emitted at the same time so that when a context is created these registers

 * are set up. These registers have to be emitted into the start of the

 * context as setting the ELSP will re-init some of these registers back

 * to the hw values.

 *

 * Return: 0 on success, otherwise the error status.

 */

int intel_rcs_context_init_mocs(struct drm_i915_gem_request *req)

{

	struct drm_i915_mocs_table t;

	int ret;

	if (get_mocs_settings(req->ring->dev, &t)) {

		struct drm_i915_private *dev_priv = req->i915;

		struct intel_engine_cs *ring;

		enum intel_ring_id ring_id;

		/* Program the control registers */

		for_each_ring(ring, dev_priv, ring_id) {

			ret = emit_mocs_control_table(req, &t, ring_id);

		if (ret)

			return ret;

		}

		/* Now program the l3cc registers */

		ret = emit_mocs_l3cc_table(req, &t);

		if (ret)

			return ret;

	}

	return 0;

}