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drm: Advertise async page flip ability through GETCAP ioctl
[karo-tx-linux.git] / drivers / gpu / drm / i915 / intel_ringbuffer.h
1 #ifndef _INTEL_RINGBUFFER_H_
2 #define _INTEL_RINGBUFFER_H_
3
4 /*
5  * Gen2 BSpec "1. Programming Environment" / 1.4.4.6 "Ring Buffer Use"
6  * Gen3 BSpec "vol1c Memory Interface Functions" / 2.3.4.5 "Ring Buffer Use"
7  * Gen4+ BSpec "vol1c Memory Interface and Command Stream" / 5.3.4.5 "Ring Buffer Use"
8  *
9  * "If the Ring Buffer Head Pointer and the Tail Pointer are on the same
10  * cacheline, the Head Pointer must not be greater than the Tail
11  * Pointer."
12  */
13 #define I915_RING_FREE_SPACE 64
14
15 struct  intel_hw_status_page {
16         u32             *page_addr;
17         unsigned int    gfx_addr;
18         struct          drm_i915_gem_object *obj;
19 };
20
21 #define I915_READ_TAIL(ring) I915_READ(RING_TAIL((ring)->mmio_base))
22 #define I915_WRITE_TAIL(ring, val) I915_WRITE(RING_TAIL((ring)->mmio_base), val)
23
24 #define I915_READ_START(ring) I915_READ(RING_START((ring)->mmio_base))
25 #define I915_WRITE_START(ring, val) I915_WRITE(RING_START((ring)->mmio_base), val)
26
27 #define I915_READ_HEAD(ring)  I915_READ(RING_HEAD((ring)->mmio_base))
28 #define I915_WRITE_HEAD(ring, val) I915_WRITE(RING_HEAD((ring)->mmio_base), val)
29
30 #define I915_READ_CTL(ring) I915_READ(RING_CTL((ring)->mmio_base))
31 #define I915_WRITE_CTL(ring, val) I915_WRITE(RING_CTL((ring)->mmio_base), val)
32
33 #define I915_READ_IMR(ring) I915_READ(RING_IMR((ring)->mmio_base))
34 #define I915_WRITE_IMR(ring, val) I915_WRITE(RING_IMR((ring)->mmio_base), val)
35
36 #define I915_READ_NOPID(ring) I915_READ(RING_NOPID((ring)->mmio_base))
37 #define I915_READ_SYNC_0(ring) I915_READ(RING_SYNC_0((ring)->mmio_base))
38 #define I915_READ_SYNC_1(ring) I915_READ(RING_SYNC_1((ring)->mmio_base))
39
40 enum intel_ring_hangcheck_action { wait, active, kick, hung };
41
42 struct intel_ring_hangcheck {
43         bool deadlock;
44         u32 seqno;
45         u32 acthd;
46         int score;
47         enum intel_ring_hangcheck_action action;
48 };
49
50 struct  intel_ring_buffer {
51         const char      *name;
52         enum intel_ring_id {
53                 RCS = 0x0,
54                 VCS,
55                 BCS,
56                 VECS,
57         } id;
58 #define I915_NUM_RINGS 4
59         u32             mmio_base;
60         void            __iomem *virtual_start;
61         struct          drm_device *dev;
62         struct          drm_i915_gem_object *obj;
63
64         u32             head;
65         u32             tail;
66         int             space;
67         int             size;
68         int             effective_size;
69         struct intel_hw_status_page status_page;
70
71         /** We track the position of the requests in the ring buffer, and
72          * when each is retired we increment last_retired_head as the GPU
73          * must have finished processing the request and so we know we
74          * can advance the ringbuffer up to that position.
75          *
76          * last_retired_head is set to -1 after the value is consumed so
77          * we can detect new retirements.
78          */
79         u32             last_retired_head;
80
81         unsigned irq_refcount; /* protected by dev_priv->irq_lock */
82         u32             irq_enable_mask;        /* bitmask to enable ring interrupt */
83         u32             trace_irq_seqno;
84         u32             sync_seqno[I915_NUM_RINGS-1];
85         bool __must_check (*irq_get)(struct intel_ring_buffer *ring);
86         void            (*irq_put)(struct intel_ring_buffer *ring);
87
88         int             (*init)(struct intel_ring_buffer *ring);
89
90         void            (*write_tail)(struct intel_ring_buffer *ring,
91                                       u32 value);
92         int __must_check (*flush)(struct intel_ring_buffer *ring,
93                                   u32   invalidate_domains,
94                                   u32   flush_domains);
95         int             (*add_request)(struct intel_ring_buffer *ring);
96         /* Some chipsets are not quite as coherent as advertised and need
97          * an expensive kick to force a true read of the up-to-date seqno.
98          * However, the up-to-date seqno is not always required and the last
99          * seen value is good enough. Note that the seqno will always be
100          * monotonic, even if not coherent.
101          */
102         u32             (*get_seqno)(struct intel_ring_buffer *ring,
103                                      bool lazy_coherency);
104         void            (*set_seqno)(struct intel_ring_buffer *ring,
105                                      u32 seqno);
106         int             (*dispatch_execbuffer)(struct intel_ring_buffer *ring,
107                                                u32 offset, u32 length,
108                                                unsigned flags);
109 #define I915_DISPATCH_SECURE 0x1
110 #define I915_DISPATCH_PINNED 0x2
111         void            (*cleanup)(struct intel_ring_buffer *ring);
112         int             (*sync_to)(struct intel_ring_buffer *ring,
113                                    struct intel_ring_buffer *to,
114                                    u32 seqno);
115
116         /* our mbox written by others */
117         u32             semaphore_register[I915_NUM_RINGS];
118         /* mboxes this ring signals to */
119         u32             signal_mbox[I915_NUM_RINGS];
120
121         /**
122          * List of objects currently involved in rendering from the
123          * ringbuffer.
124          *
125          * Includes buffers having the contents of their GPU caches
126          * flushed, not necessarily primitives.  last_rendering_seqno
127          * represents when the rendering involved will be completed.
128          *
129          * A reference is held on the buffer while on this list.
130          */
131         struct list_head active_list;
132
133         /**
134          * List of breadcrumbs associated with GPU requests currently
135          * outstanding.
136          */
137         struct list_head request_list;
138
139         /**
140          * Do we have some not yet emitted requests outstanding?
141          */
142         u32 outstanding_lazy_request;
143         bool gpu_caches_dirty;
144         bool fbc_dirty;
145
146         wait_queue_head_t irq_queue;
147
148         /**
149          * Do an explicit TLB flush before MI_SET_CONTEXT
150          */
151         bool itlb_before_ctx_switch;
152         struct i915_hw_context *default_context;
153         struct i915_hw_context *last_context;
154
155         struct intel_ring_hangcheck hangcheck;
156
157         void *private;
158 };
159
160 static inline bool
161 intel_ring_initialized(struct intel_ring_buffer *ring)
162 {
163         return ring->obj != NULL;
164 }
165
166 static inline unsigned
167 intel_ring_flag(struct intel_ring_buffer *ring)
168 {
169         return 1 << ring->id;
170 }
171
172 static inline u32
173 intel_ring_sync_index(struct intel_ring_buffer *ring,
174                       struct intel_ring_buffer *other)
175 {
176         int idx;
177
178         /*
179          * cs -> 0 = vcs, 1 = bcs
180          * vcs -> 0 = bcs, 1 = cs,
181          * bcs -> 0 = cs, 1 = vcs.
182          */
183
184         idx = (other - ring) - 1;
185         if (idx < 0)
186                 idx += I915_NUM_RINGS;
187
188         return idx;
189 }
190
191 static inline u32
192 intel_read_status_page(struct intel_ring_buffer *ring,
193                        int reg)
194 {
195         /* Ensure that the compiler doesn't optimize away the load. */
196         barrier();
197         return ring->status_page.page_addr[reg];
198 }
199
200 static inline void
201 intel_write_status_page(struct intel_ring_buffer *ring,
202                         int reg, u32 value)
203 {
204         ring->status_page.page_addr[reg] = value;
205 }
206
207 /**
208  * Reads a dword out of the status page, which is written to from the command
209  * queue by automatic updates, MI_REPORT_HEAD, MI_STORE_DATA_INDEX, or
210  * MI_STORE_DATA_IMM.
211  *
212  * The following dwords have a reserved meaning:
213  * 0x00: ISR copy, updated when an ISR bit not set in the HWSTAM changes.
214  * 0x04: ring 0 head pointer
215  * 0x05: ring 1 head pointer (915-class)
216  * 0x06: ring 2 head pointer (915-class)
217  * 0x10-0x1b: Context status DWords (GM45)
218  * 0x1f: Last written status offset. (GM45)
219  *
220  * The area from dword 0x20 to 0x3ff is available for driver usage.
221  */
222 #define I915_GEM_HWS_INDEX              0x20
223 #define I915_GEM_HWS_SCRATCH_INDEX      0x30
224 #define I915_GEM_HWS_SCRATCH_ADDR (I915_GEM_HWS_SCRATCH_INDEX << MI_STORE_DWORD_INDEX_SHIFT)
225
226 void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring);
227
228 int __must_check intel_ring_begin(struct intel_ring_buffer *ring, int n);
229 static inline void intel_ring_emit(struct intel_ring_buffer *ring,
230                                    u32 data)
231 {
232         iowrite32(data, ring->virtual_start + ring->tail);
233         ring->tail += 4;
234 }
235 void intel_ring_advance(struct intel_ring_buffer *ring);
236 int __must_check intel_ring_idle(struct intel_ring_buffer *ring);
237 void intel_ring_init_seqno(struct intel_ring_buffer *ring, u32 seqno);
238 int intel_ring_flush_all_caches(struct intel_ring_buffer *ring);
239 int intel_ring_invalidate_all_caches(struct intel_ring_buffer *ring);
240
241 int intel_init_render_ring_buffer(struct drm_device *dev);
242 int intel_init_bsd_ring_buffer(struct drm_device *dev);
243 int intel_init_blt_ring_buffer(struct drm_device *dev);
244 int intel_init_vebox_ring_buffer(struct drm_device *dev);
245
246 u32 intel_ring_get_active_head(struct intel_ring_buffer *ring);
247 void intel_ring_setup_status_page(struct intel_ring_buffer *ring);
248
249 static inline u32 intel_ring_get_tail(struct intel_ring_buffer *ring)
250 {
251         return ring->tail;
252 }
253
254 static inline u32 intel_ring_get_seqno(struct intel_ring_buffer *ring)
255 {
256         BUG_ON(ring->outstanding_lazy_request == 0);
257         return ring->outstanding_lazy_request;
258 }
259
260 static inline void i915_trace_irq_get(struct intel_ring_buffer *ring, u32 seqno)
261 {
262         if (ring->trace_irq_seqno == 0 && ring->irq_get(ring))
263                 ring->trace_irq_seqno = seqno;
264 }
265
266 /* DRI warts */
267 int intel_render_ring_init_dri(struct drm_device *dev, u64 start, u32 size);
268
269 #endif /* _INTEL_RINGBUFFER_H_ */