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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_MODE(ring) I915_READ(RING_MI_MODE((ring)->mmio_base))
37 #define I915_WRITE_MODE(ring, val) I915_WRITE(RING_MI_MODE((ring)->mmio_base), val)
38
39 enum intel_ring_hangcheck_action {
40         HANGCHECK_IDLE = 0,
41         HANGCHECK_WAIT,
42         HANGCHECK_ACTIVE,
43         HANGCHECK_KICK,
44         HANGCHECK_HUNG,
45 };
46
47 #define HANGCHECK_SCORE_RING_HUNG 31
48
49 struct intel_ring_hangcheck {
50         u64 acthd;
51         u32 seqno;
52         int score;
53         enum intel_ring_hangcheck_action action;
54         bool deadlock;
55 };
56
57 struct  intel_ring_buffer {
58         const char      *name;
59         enum intel_ring_id {
60                 RCS = 0x0,
61                 VCS,
62                 BCS,
63                 VECS,
64         } id;
65 #define I915_NUM_RINGS 4
66         u32             mmio_base;
67         void            __iomem *virtual_start;
68         struct          drm_device *dev;
69         struct          drm_i915_gem_object *obj;
70
71         u32             head;
72         u32             tail;
73         int             space;
74         int             size;
75         int             effective_size;
76         struct intel_hw_status_page status_page;
77
78         /** We track the position of the requests in the ring buffer, and
79          * when each is retired we increment last_retired_head as the GPU
80          * must have finished processing the request and so we know we
81          * can advance the ringbuffer up to that position.
82          *
83          * last_retired_head is set to -1 after the value is consumed so
84          * we can detect new retirements.
85          */
86         u32             last_retired_head;
87
88         unsigned irq_refcount; /* protected by dev_priv->irq_lock */
89         u32             irq_enable_mask;        /* bitmask to enable ring interrupt */
90         u32             trace_irq_seqno;
91         u32             sync_seqno[I915_NUM_RINGS-1];
92         bool __must_check (*irq_get)(struct intel_ring_buffer *ring);
93         void            (*irq_put)(struct intel_ring_buffer *ring);
94
95         int             (*init)(struct intel_ring_buffer *ring);
96
97         void            (*write_tail)(struct intel_ring_buffer *ring,
98                                       u32 value);
99         int __must_check (*flush)(struct intel_ring_buffer *ring,
100                                   u32   invalidate_domains,
101                                   u32   flush_domains);
102         int             (*add_request)(struct intel_ring_buffer *ring);
103         /* Some chipsets are not quite as coherent as advertised and need
104          * an expensive kick to force a true read of the up-to-date seqno.
105          * However, the up-to-date seqno is not always required and the last
106          * seen value is good enough. Note that the seqno will always be
107          * monotonic, even if not coherent.
108          */
109         u32             (*get_seqno)(struct intel_ring_buffer *ring,
110                                      bool lazy_coherency);
111         void            (*set_seqno)(struct intel_ring_buffer *ring,
112                                      u32 seqno);
113         int             (*dispatch_execbuffer)(struct intel_ring_buffer *ring,
114                                                u32 offset, u32 length,
115                                                unsigned flags);
116 #define I915_DISPATCH_SECURE 0x1
117 #define I915_DISPATCH_PINNED 0x2
118         void            (*cleanup)(struct intel_ring_buffer *ring);
119         int             (*sync_to)(struct intel_ring_buffer *ring,
120                                    struct intel_ring_buffer *to,
121                                    u32 seqno);
122
123         /* our mbox written by others */
124         u32             semaphore_register[I915_NUM_RINGS];
125         /* mboxes this ring signals to */
126         u32             signal_mbox[I915_NUM_RINGS];
127
128         /**
129          * List of objects currently involved in rendering from the
130          * ringbuffer.
131          *
132          * Includes buffers having the contents of their GPU caches
133          * flushed, not necessarily primitives.  last_rendering_seqno
134          * represents when the rendering involved will be completed.
135          *
136          * A reference is held on the buffer while on this list.
137          */
138         struct list_head active_list;
139
140         /**
141          * List of breadcrumbs associated with GPU requests currently
142          * outstanding.
143          */
144         struct list_head request_list;
145
146         /**
147          * Do we have some not yet emitted requests outstanding?
148          */
149         struct drm_i915_gem_request *preallocated_lazy_request;
150         u32 outstanding_lazy_seqno;
151         bool gpu_caches_dirty;
152         bool fbc_dirty;
153
154         wait_queue_head_t irq_queue;
155
156         /**
157          * Do an explicit TLB flush before MI_SET_CONTEXT
158          */
159         bool itlb_before_ctx_switch;
160         struct i915_hw_context *default_context;
161         struct i915_hw_context *last_context;
162
163         struct intel_ring_hangcheck hangcheck;
164
165         struct {
166                 struct drm_i915_gem_object *obj;
167                 u32 gtt_offset;
168                 volatile u32 *cpu_page;
169         } scratch;
170
171         /*
172          * Tables of commands the command parser needs to know about
173          * for this ring.
174          */
175         const struct drm_i915_cmd_table *cmd_tables;
176         int cmd_table_count;
177
178         /*
179          * Table of registers allowed in commands that read/write registers.
180          */
181         const u32 *reg_table;
182         int reg_count;
183
184         /*
185          * Table of registers allowed in commands that read/write registers, but
186          * only from the DRM master.
187          */
188         const u32 *master_reg_table;
189         int master_reg_count;
190
191         /*
192          * Returns the bitmask for the length field of the specified command.
193          * Return 0 for an unrecognized/invalid command.
194          *
195          * If the command parser finds an entry for a command in the ring's
196          * cmd_tables, it gets the command's length based on the table entry.
197          * If not, it calls this function to determine the per-ring length field
198          * encoding for the command (i.e. certain opcode ranges use certain bits
199          * to encode the command length in the header).
200          */
201         u32 (*get_cmd_length_mask)(u32 cmd_header);
202 };
203
204 static inline bool
205 intel_ring_initialized(struct intel_ring_buffer *ring)
206 {
207         return ring->obj != NULL;
208 }
209
210 static inline unsigned
211 intel_ring_flag(struct intel_ring_buffer *ring)
212 {
213         return 1 << ring->id;
214 }
215
216 static inline u32
217 intel_ring_sync_index(struct intel_ring_buffer *ring,
218                       struct intel_ring_buffer *other)
219 {
220         int idx;
221
222         /*
223          * cs -> 0 = vcs, 1 = bcs
224          * vcs -> 0 = bcs, 1 = cs,
225          * bcs -> 0 = cs, 1 = vcs.
226          */
227
228         idx = (other - ring) - 1;
229         if (idx < 0)
230                 idx += I915_NUM_RINGS;
231
232         return idx;
233 }
234
235 static inline u32
236 intel_read_status_page(struct intel_ring_buffer *ring,
237                        int reg)
238 {
239         /* Ensure that the compiler doesn't optimize away the load. */
240         barrier();
241         return ring->status_page.page_addr[reg];
242 }
243
244 static inline void
245 intel_write_status_page(struct intel_ring_buffer *ring,
246                         int reg, u32 value)
247 {
248         ring->status_page.page_addr[reg] = value;
249 }
250
251 /**
252  * Reads a dword out of the status page, which is written to from the command
253  * queue by automatic updates, MI_REPORT_HEAD, MI_STORE_DATA_INDEX, or
254  * MI_STORE_DATA_IMM.
255  *
256  * The following dwords have a reserved meaning:
257  * 0x00: ISR copy, updated when an ISR bit not set in the HWSTAM changes.
258  * 0x04: ring 0 head pointer
259  * 0x05: ring 1 head pointer (915-class)
260  * 0x06: ring 2 head pointer (915-class)
261  * 0x10-0x1b: Context status DWords (GM45)
262  * 0x1f: Last written status offset. (GM45)
263  *
264  * The area from dword 0x20 to 0x3ff is available for driver usage.
265  */
266 #define I915_GEM_HWS_INDEX              0x20
267 #define I915_GEM_HWS_SCRATCH_INDEX      0x30
268 #define I915_GEM_HWS_SCRATCH_ADDR (I915_GEM_HWS_SCRATCH_INDEX << MI_STORE_DWORD_INDEX_SHIFT)
269
270 void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring);
271
272 int __must_check intel_ring_begin(struct intel_ring_buffer *ring, int n);
273 int __must_check intel_ring_cacheline_align(struct intel_ring_buffer *ring);
274 static inline void intel_ring_emit(struct intel_ring_buffer *ring,
275                                    u32 data)
276 {
277         iowrite32(data, ring->virtual_start + ring->tail);
278         ring->tail += 4;
279 }
280 static inline void intel_ring_advance(struct intel_ring_buffer *ring)
281 {
282         ring->tail &= ring->size - 1;
283 }
284 void __intel_ring_advance(struct intel_ring_buffer *ring);
285
286 int __must_check intel_ring_idle(struct intel_ring_buffer *ring);
287 void intel_ring_init_seqno(struct intel_ring_buffer *ring, u32 seqno);
288 int intel_ring_flush_all_caches(struct intel_ring_buffer *ring);
289 int intel_ring_invalidate_all_caches(struct intel_ring_buffer *ring);
290
291 int intel_init_render_ring_buffer(struct drm_device *dev);
292 int intel_init_bsd_ring_buffer(struct drm_device *dev);
293 int intel_init_blt_ring_buffer(struct drm_device *dev);
294 int intel_init_vebox_ring_buffer(struct drm_device *dev);
295
296 u64 intel_ring_get_active_head(struct intel_ring_buffer *ring);
297 void intel_ring_setup_status_page(struct intel_ring_buffer *ring);
298
299 static inline u32 intel_ring_get_tail(struct intel_ring_buffer *ring)
300 {
301         return ring->tail;
302 }
303
304 static inline u32 intel_ring_get_seqno(struct intel_ring_buffer *ring)
305 {
306         BUG_ON(ring->outstanding_lazy_seqno == 0);
307         return ring->outstanding_lazy_seqno;
308 }
309
310 static inline void i915_trace_irq_get(struct intel_ring_buffer *ring, u32 seqno)
311 {
312         if (ring->trace_irq_seqno == 0 && ring->irq_get(ring))
313                 ring->trace_irq_seqno = seqno;
314 }
315
316 /* DRI warts */
317 int intel_render_ring_init_dri(struct drm_device *dev, u64 start, u32 size);
318
319 #endif /* _INTEL_RINGBUFFER_H_ */