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/*

 * Copyright © 2014 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.

 *

 * Please try to maintain the following order within this file unless it makes

 * sense to do otherwise. From top to bottom:

 * 1. typedefs

 * 2. #defines, and macros

 * 3. structure definitions

 * 4. function prototypes

 *

 * Within each section, please try to order by generation in ascending order,

 * from top to bottom (ie. gen6 on the top, gen8 on the bottom).

 */

#ifndef __I915_GEM_GTT_H__

#define __I915_GEM_GTT_H__

typedef uint32_t gen6_gtt_pte_t;

typedef uint64_t gen8_gtt_pte_t;

typedef gen8_gtt_pte_t gen8_ppgtt_pde_t;

#define gtt_total_entries(gtt) ((gtt).base.total >> PAGE_SHIFT)

#define I915_PPGTT_PT_ENTRIES		(PAGE_SIZE / sizeof(gen6_gtt_pte_t))

/* gen6-hsw has bit 11-4 for physical addr bit 39-32 */

#define GEN6_GTT_ADDR_ENCODE(addr)	((addr) | (((addr) >> 28) & 0xff0))

#define GEN6_PTE_ADDR_ENCODE(addr)	GEN6_GTT_ADDR_ENCODE(addr)

#define GEN6_PDE_ADDR_ENCODE(addr)	GEN6_GTT_ADDR_ENCODE(addr)

#define GEN6_PTE_CACHE_LLC		(2 << 1)

#define GEN6_PTE_UNCACHED		(1 << 1)

#define GEN6_PTE_VALID			(1 << 0)

#define GEN6_PPGTT_PD_ENTRIES		512

#define GEN6_PD_SIZE			(GEN6_PPGTT_PD_ENTRIES * PAGE_SIZE)

#define GEN6_PD_ALIGN			(PAGE_SIZE * 16)

#define GEN6_PDE_VALID			(1 << 0)

#define GEN7_PTE_CACHE_L3_LLC		(3 << 1)

#define BYT_PTE_SNOOPED_BY_CPU_CACHES	(1 << 2)

#define BYT_PTE_WRITEABLE		(1 << 1)

/* Cacheability Control is a 4-bit value. The low three bits are stored in bits

 * 3:1 of the PTE, while the fourth bit is stored in bit 11 of the PTE.

 */

#define HSW_CACHEABILITY_CONTROL(bits)	((((bits) & 0x7) << 1) | \

					 (((bits) & 0x8) << (11 - 3)))

#define HSW_WB_LLC_AGE3			HSW_CACHEABILITY_CONTROL(0x2)

#define HSW_WB_LLC_AGE0			HSW_CACHEABILITY_CONTROL(0x3)

#define HSW_WB_ELLC_LLC_AGE3		HSW_CACHEABILITY_CONTROL(0x8)

#define HSW_WB_ELLC_LLC_AGE0		HSW_CACHEABILITY_CONTROL(0xb)

#define HSW_WT_ELLC_LLC_AGE3		HSW_CACHEABILITY_CONTROL(0x7)

#define HSW_WT_ELLC_LLC_AGE0		HSW_CACHEABILITY_CONTROL(0x6)

#define HSW_PTE_UNCACHED		(0)

#define HSW_GTT_ADDR_ENCODE(addr)	((addr) | (((addr) >> 28) & 0x7f0))

#define HSW_PTE_ADDR_ENCODE(addr)	HSW_GTT_ADDR_ENCODE(addr)

/* GEN8 legacy style address is defined as a 3 level page table:

 * 31:30 | 29:21 | 20:12 |  11:0

 * PDPE  |  PDE  |  PTE  | offset

 * The difference as compared to normal x86 3 level page table is the PDPEs are

 * programmed via register.

 */

#define GEN8_PDPE_SHIFT			30

#define GEN8_PDPE_MASK			0x3

#define GEN8_PDE_SHIFT			21

#define GEN8_PDE_MASK			0x1ff

#define GEN8_PTE_SHIFT			12

#define GEN8_PTE_MASK			0x1ff

#define GEN8_LEGACY_PDPS		4

#define GEN8_PTES_PER_PAGE		(PAGE_SIZE / sizeof(gen8_gtt_pte_t))

#define GEN8_PDES_PER_PAGE		(PAGE_SIZE / sizeof(gen8_ppgtt_pde_t))

#define PPAT_UNCACHED_INDEX		(_PAGE_PWT | _PAGE_PCD)

#define PPAT_CACHED_PDE_INDEX		0 /* WB LLC */

#define PPAT_CACHED_INDEX		_PAGE_PAT /* WB LLCeLLC */

#define PPAT_DISPLAY_ELLC_INDEX		_PAGE_PCD /* WT eLLC */

#define CHV_PPAT_SNOOP			(1<<6)

#define GEN8_PPAT_AGE(x)		(x<<4)

#define GEN8_PPAT_LLCeLLC		(3<<2)

#define GEN8_PPAT_LLCELLC		(2<<2)

#define GEN8_PPAT_LLC			(1<<2)

#define GEN8_PPAT_WB			(3<<0)

#define GEN8_PPAT_WT			(2<<0)

#define GEN8_PPAT_WC			(1<<0)

#define GEN8_PPAT_UC			(0<<0)

#define GEN8_PPAT_ELLC_OVERRIDE		(0<<2)

#define GEN8_PPAT(i, x)			((uint64_t) (x) << ((i) * 8))

enum i915_cache_level;

/**

 * A VMA represents a GEM BO that is bound into an address space. Therefore, a

 * VMA's presence cannot be guaranteed before binding, or after unbinding the

 * object into/from the address space.

 *

 * To make things as simple as possible (ie. no refcounting), a VMA's lifetime

 * will always be <= an objects lifetime. So object refcounting should cover us.

 */

struct i915_vma {

	struct drm_mm_node node;

	struct drm_i915_gem_object *obj;

	struct i915_address_space *vm;

	/** This object's place on the active/inactive lists */

	struct list_head mm_list;

	struct list_head vma_link; /* Link in the object's VMA list */

	/** This vma's place in the batchbuffer or on the eviction list */

	struct list_head exec_list;

	/**

	 * Used for performing relocations during execbuffer insertion.

	 */

	struct hlist_node exec_node;

	unsigned long exec_handle;

	struct drm_i915_gem_exec_object2 *exec_entry;

	/**

	 * How many users have pinned this object in GTT space. The following

	 * users can each hold at most one reference: pwrite/pread, pin_ioctl

	 * (via user_pin_count), execbuffer (objects are not allowed multiple

	 * times for the same batchbuffer), and the framebuffer code. When

	 * switching/pageflipping, the framebuffer code has at most two buffers

	 * pinned per crtc.

	 *

	 * In the worst case this is 1 + 1 + 1 + 2*2 = 7. That would fit into 3

	 * bits with absolutely no headroom. So use 4 bits. */

	unsigned int pin_count:4;

#define DRM_I915_GEM_OBJECT_MAX_PIN_COUNT 0xf

	/** Unmap an object from an address space. This usually consists of

	 * setting the valid PTE entries to a reserved scratch page. */

	void (*unbind_vma)(struct i915_vma *vma);

	/* Map an object into an address space with the given cache flags. */

#define GLOBAL_BIND (1<<0)

#define PTE_READ_ONLY (1<<1)

	void (*bind_vma)(struct i915_vma *vma,

			 enum i915_cache_level cache_level,

			 u32 flags);

};

struct i915_address_space {

	struct drm_mm mm;

	struct drm_device *dev;

	struct list_head global_link;

	unsigned long start;		/* Start offset always 0 for dri2 */

	size_t total;		/* size addr space maps (ex. 2GB for ggtt) */

	struct {

		dma_addr_t addr;

		struct page *page;

	} scratch;

	/**

	 * List of objects currently involved in rendering.

	 *

	 * Includes buffers having the contents of their GPU caches

	 * flushed, not necessarily primitives.  last_rendering_seqno

	 * represents when the rendering involved will be completed.

	 *

	 * A reference is held on the buffer while on this list.

	 */

	struct list_head active_list;

	/**

	 * LRU list of objects which are not in the ringbuffer and

	 * are ready to unbind, but are still in the GTT.

	 *

	 * last_rendering_seqno is 0 while an object is in this list.

	 *

	 * A reference is not held on the buffer while on this list,

	 * as merely being GTT-bound shouldn't prevent its being

	 * freed, and we'll pull it off the list in the free path.

	 */

	struct list_head inactive_list;

	/* FIXME: Need a more generic return type */

	gen6_gtt_pte_t (*pte_encode)(dma_addr_t addr,

				     enum i915_cache_level level,

				     bool valid, u32 flags); /* Create a valid PTE */

	void (*clear_range)(struct i915_address_space *vm,

			    uint64_t start,

			    uint64_t length,

			    bool use_scratch);

	void (*insert_entries)(struct i915_address_space *vm,

			       struct sg_table *st,

			       uint64_t start,

			       enum i915_cache_level cache_level, u32 flags);

	void (*cleanup)(struct i915_address_space *vm);

};

/* The Graphics Translation Table is the way in which GEN hardware translates a

 * Graphics Virtual Address into a Physical Address. In addition to the normal

 * collateral associated with any va->pa translations GEN hardware also has a

 * portion of the GTT which can be mapped by the CPU and remain both coherent

 * and correct (in cases like swizzling). That region is referred to as GMADR in

 * the spec.

 */

struct i915_gtt {

	struct i915_address_space base;

	size_t stolen_size;		/* Total size of stolen memory */

	unsigned long mappable_end;	/* End offset that we can CPU map */

	struct io_mapping *mappable;	/* Mapping to our CPU mappable region */

	phys_addr_t mappable_base;	/* PA of our GMADR */

	/** "Graphics Stolen Memory" holds the global PTEs */

	void __iomem *gsm;

	bool do_idle_maps;

	int mtrr;

	/* global gtt ops */

	int (*gtt_probe)(struct drm_device *dev, size_t *gtt_total,

			  size_t *stolen, phys_addr_t *mappable_base,

			  unsigned long *mappable_end);

};

struct i915_hw_ppgtt {

	struct i915_address_space base;

	struct kref ref;

	struct drm_mm_node node;

	unsigned num_pd_entries;

	unsigned num_pd_pages; /* gen8+ */

	union {

		struct page **pt_pages;

		struct page **gen8_pt_pages[GEN8_LEGACY_PDPS];

	};

	struct page *pd_pages;

	union {

		uint32_t pd_offset;

		dma_addr_t pd_dma_addr[GEN8_LEGACY_PDPS];

	};

	union {

		dma_addr_t *pt_dma_addr;

		dma_addr_t *gen8_pt_dma_addr[4];

	};

	struct intel_context *ctx;

	int (*enable)(struct i915_hw_ppgtt *ppgtt);

	int (*switch_mm)(struct i915_hw_ppgtt *ppgtt,

			 struct intel_engine_cs *ring,

			 bool synchronous);

//   void (*debug_dump)(struct i915_hw_ppgtt *ppgtt, struct seq_file *m);

};

int i915_gem_gtt_init(struct drm_device *dev);

void i915_gem_init_global_gtt(struct drm_device *dev);

void i915_gem_setup_global_gtt(struct drm_device *dev, unsigned long start,

			       unsigned long mappable_end, unsigned long end);

bool intel_enable_ppgtt(struct drm_device *dev, bool full);

int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt);

void i915_check_and_clear_faults(struct drm_device *dev);

void i915_gem_suspend_gtt_mappings(struct drm_device *dev);

void i915_gem_restore_gtt_mappings(struct drm_device *dev);

int __must_check i915_gem_gtt_prepare_object(struct drm_i915_gem_object *obj);

void i915_gem_gtt_finish_object(struct drm_i915_gem_object *obj);

#endif