1/*
  2 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
  3 *
  4 * Permission is hereby granted, free of charge, to any person obtaining a
  5 * copy of this software and associated documentation files (the "Software"),
  6 * to deal in the Software without restriction, including without limitation
  7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8 * and/or sell copies of the Software, and to permit persons to whom the
  9 * Software is furnished to do so, subject to the following conditions:
 10 *
 11 * The above copyright notice and this permission notice (including the next
 12 * paragraph) shall be included in all copies or substantial portions of the
 13 * Software.
 14 *
 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 21 * SOFTWARE.
 22 *
 23 * Authors:
 24 *    Zhi Wang <zhi.a.wang@intel.com>
 25 *    Zhenyu Wang <zhenyuw@linux.intel.com>
 26 *    Xiao Zheng <xiao.zheng@intel.com>
 27 *
 28 * Contributors:
 29 *    Min He <min.he@intel.com>
 30 *    Bing Niu <bing.niu@intel.com>
 31 *
 32 */
 33
 34#ifndef _GVT_GTT_H_
 35#define _GVT_GTT_H_
 36
 37#define I915_GTT_PAGE_SHIFT         12
 38
 39struct intel_vgpu_mm;
 40
 41#define INTEL_GVT_INVALID_ADDR (~0UL)
 42
 43struct intel_gvt_gtt_entry {
 44	u64 val64;
 45	int type;
 46};
 47
 48struct intel_gvt_gtt_pte_ops {
 49	int (*get_entry)(void *pt,
 50			 struct intel_gvt_gtt_entry *e,
 51			 unsigned long index,
 52			 bool hypervisor_access,
 53			 unsigned long gpa,
 54			 struct intel_vgpu *vgpu);
 55	int (*set_entry)(void *pt,
 56			 struct intel_gvt_gtt_entry *e,
 57			 unsigned long index,
 58			 bool hypervisor_access,
 59			 unsigned long gpa,
 60			 struct intel_vgpu *vgpu);
 61	bool (*test_present)(struct intel_gvt_gtt_entry *e);
 62	void (*clear_present)(struct intel_gvt_gtt_entry *e);
 63	void (*set_present)(struct intel_gvt_gtt_entry *e);
 64	bool (*test_pse)(struct intel_gvt_gtt_entry *e);
 65	void (*clear_pse)(struct intel_gvt_gtt_entry *e);
 66	bool (*test_ips)(struct intel_gvt_gtt_entry *e);
 67	void (*clear_ips)(struct intel_gvt_gtt_entry *e);
 68	bool (*test_64k_splited)(struct intel_gvt_gtt_entry *e);
 69	void (*clear_64k_splited)(struct intel_gvt_gtt_entry *e);
 70	void (*set_64k_splited)(struct intel_gvt_gtt_entry *e);
 71	void (*set_pfn)(struct intel_gvt_gtt_entry *e, unsigned long pfn);
 72	unsigned long (*get_pfn)(struct intel_gvt_gtt_entry *e);
 73};
 74
 75struct intel_gvt_gtt_gma_ops {
 76	unsigned long (*gma_to_ggtt_pte_index)(unsigned long gma);
 77	unsigned long (*gma_to_pte_index)(unsigned long gma);
 78	unsigned long (*gma_to_pde_index)(unsigned long gma);
 79	unsigned long (*gma_to_l3_pdp_index)(unsigned long gma);
 80	unsigned long (*gma_to_l4_pdp_index)(unsigned long gma);
 81	unsigned long (*gma_to_pml4_index)(unsigned long gma);
 82};
 83
 84struct intel_gvt_gtt {
 85	struct intel_gvt_gtt_pte_ops *pte_ops;
 86	struct intel_gvt_gtt_gma_ops *gma_ops;
 87	int (*mm_alloc_page_table)(struct intel_vgpu_mm *mm);
 88	void (*mm_free_page_table)(struct intel_vgpu_mm *mm);
 89	struct list_head oos_page_use_list_head;
 90	struct list_head oos_page_free_list_head;
 91	struct mutex ppgtt_mm_lock;
 92	struct list_head ppgtt_mm_lru_list_head;
 93
 94	struct page *scratch_page;
 95	unsigned long scratch_mfn;
 96};
 97
 98enum intel_gvt_gtt_type {
 99	GTT_TYPE_INVALID = 0,
100
101	GTT_TYPE_GGTT_PTE,
102
103	GTT_TYPE_PPGTT_PTE_4K_ENTRY,
104	GTT_TYPE_PPGTT_PTE_64K_ENTRY,
105	GTT_TYPE_PPGTT_PTE_2M_ENTRY,
106	GTT_TYPE_PPGTT_PTE_1G_ENTRY,
107
108	GTT_TYPE_PPGTT_PTE_ENTRY,
109
110	GTT_TYPE_PPGTT_PDE_ENTRY,
111	GTT_TYPE_PPGTT_PDP_ENTRY,
112	GTT_TYPE_PPGTT_PML4_ENTRY,
113
114	GTT_TYPE_PPGTT_ROOT_ENTRY,
115
116	GTT_TYPE_PPGTT_ROOT_L3_ENTRY,
117	GTT_TYPE_PPGTT_ROOT_L4_ENTRY,
118
119	GTT_TYPE_PPGTT_ENTRY,
120
121	GTT_TYPE_PPGTT_PTE_PT,
122	GTT_TYPE_PPGTT_PDE_PT,
123	GTT_TYPE_PPGTT_PDP_PT,
124	GTT_TYPE_PPGTT_PML4_PT,
125
126	GTT_TYPE_MAX,
127};
128
129enum intel_gvt_mm_type {
130	INTEL_GVT_MM_GGTT,
131	INTEL_GVT_MM_PPGTT,
132};
133
134#define GVT_RING_CTX_NR_PDPS	GEN8_3LVL_PDPES
135
136struct intel_gvt_partial_pte {
137	unsigned long offset;
138	u64 data;
139	struct list_head list;
140};
141
142struct intel_vgpu_mm {
143	enum intel_gvt_mm_type type;
144	struct intel_vgpu *vgpu;
145
146	struct kref ref;
147	atomic_t pincount;
148
149	union {
150		struct {
151			enum intel_gvt_gtt_type root_entry_type;
152			/*
153			 * The 4 PDPs in ring context. For 48bit addressing,
154			 * only PDP0 is valid and point to PML4. For 32it
155			 * addressing, all 4 are used as true PDPs.
156			 */
157			u64 guest_pdps[GVT_RING_CTX_NR_PDPS];
158			u64 shadow_pdps[GVT_RING_CTX_NR_PDPS];
159			bool shadowed;
160
161			struct list_head list;
162			struct list_head lru_list;
163		} ppgtt_mm;
164		struct {
165			void *virtual_ggtt;
166			struct list_head partial_pte_list;
167		} ggtt_mm;
168	};
169};
170
171struct intel_vgpu_mm *intel_vgpu_create_ppgtt_mm(struct intel_vgpu *vgpu,
172		enum intel_gvt_gtt_type root_entry_type, u64 pdps[]);
173
174static inline void intel_vgpu_mm_get(struct intel_vgpu_mm *mm)
175{
176	kref_get(&mm->ref);
177}
178
179void _intel_vgpu_mm_release(struct kref *mm_ref);
180
181static inline void intel_vgpu_mm_put(struct intel_vgpu_mm *mm)
182{
183	kref_put(&mm->ref, _intel_vgpu_mm_release);
184}
185
186static inline void intel_vgpu_destroy_mm(struct intel_vgpu_mm *mm)
187{
188	intel_vgpu_mm_put(mm);
189}
190
191struct intel_vgpu_guest_page;
192
193struct intel_vgpu_scratch_pt {
194	struct page *page;
195	unsigned long page_mfn;
196};
197
198struct intel_vgpu_gtt {
199	struct intel_vgpu_mm *ggtt_mm;
200	unsigned long active_ppgtt_mm_bitmap;
201	struct list_head ppgtt_mm_list_head;
202	struct radix_tree_root spt_tree;
203	struct list_head oos_page_list_head;
204	struct list_head post_shadow_list_head;
205	struct intel_vgpu_scratch_pt scratch_pt[GTT_TYPE_MAX];
206};
207
208int intel_vgpu_init_gtt(struct intel_vgpu *vgpu);
209void intel_vgpu_clean_gtt(struct intel_vgpu *vgpu);
210void intel_vgpu_reset_ggtt(struct intel_vgpu *vgpu, bool invalidate_old);
211void intel_vgpu_invalidate_ppgtt(struct intel_vgpu *vgpu);
212
213int intel_gvt_init_gtt(struct intel_gvt *gvt);
214void intel_vgpu_reset_gtt(struct intel_vgpu *vgpu);
215void intel_gvt_clean_gtt(struct intel_gvt *gvt);
216
217struct intel_vgpu_mm *intel_gvt_find_ppgtt_mm(struct intel_vgpu *vgpu,
218					      int page_table_level,
219					      void *root_entry);
220
221struct intel_vgpu_oos_page {
222	struct intel_vgpu_ppgtt_spt *spt;
223	struct list_head list;
224	struct list_head vm_list;
225	int id;
226	void *mem;
227};
228
229#define GTT_ENTRY_NUM_IN_ONE_PAGE 512
230
231/* Represent a vgpu shadow page table. */
232struct intel_vgpu_ppgtt_spt {
233	atomic_t refcount;
234	struct intel_vgpu *vgpu;
235
236	struct {
237		enum intel_gvt_gtt_type type;
238		bool pde_ips; /* for 64KB PTEs */
239		void *vaddr;
240		struct page *page;
241		unsigned long mfn;
242	} shadow_page;
243
244	struct {
245		enum intel_gvt_gtt_type type;
246		bool pde_ips; /* for 64KB PTEs */
247		unsigned long gfn;
248		unsigned long write_cnt;
249		struct intel_vgpu_oos_page *oos_page;
250	} guest_page;
251
252	DECLARE_BITMAP(post_shadow_bitmap, GTT_ENTRY_NUM_IN_ONE_PAGE);
253	struct list_head post_shadow_list;
254};
255
256int intel_vgpu_sync_oos_pages(struct intel_vgpu *vgpu);
257
258int intel_vgpu_flush_post_shadow(struct intel_vgpu *vgpu);
259
260int intel_vgpu_pin_mm(struct intel_vgpu_mm *mm);
261
262void intel_vgpu_unpin_mm(struct intel_vgpu_mm *mm);
263
264unsigned long intel_vgpu_gma_to_gpa(struct intel_vgpu_mm *mm,
265		unsigned long gma);
266
267struct intel_vgpu_mm *intel_vgpu_find_ppgtt_mm(struct intel_vgpu *vgpu,
268		u64 pdps[]);
269
270struct intel_vgpu_mm *intel_vgpu_get_ppgtt_mm(struct intel_vgpu *vgpu,
271		enum intel_gvt_gtt_type root_entry_type, u64 pdps[]);
272
273int intel_vgpu_put_ppgtt_mm(struct intel_vgpu *vgpu, u64 pdps[]);
274
275int intel_vgpu_emulate_ggtt_mmio_read(struct intel_vgpu *vgpu,
276	unsigned int off, void *p_data, unsigned int bytes);
277
278int intel_vgpu_emulate_ggtt_mmio_write(struct intel_vgpu *vgpu,
279	unsigned int off, void *p_data, unsigned int bytes);
280
281#endif /* _GVT_GTT_H_ */