Merge tag 'drm-intel-next-2012-12-21' of git://people.freedesktop.org/~danvet/drm...
[linux-drm-fsl-dcu.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 struct  intel_ring_buffer {
41         const char      *name;
42         enum intel_ring_id {
43                 RCS = 0x0,
44                 VCS,
45                 BCS,
46         } id;
47 #define I915_NUM_RINGS 3
48         u32             mmio_base;
49         void            __iomem *virtual_start;
50         struct          drm_device *dev;
51         struct          drm_i915_gem_object *obj;
52
53         u32             head;
54         u32             tail;
55         int             space;
56         int             size;
57         int             effective_size;
58         struct intel_hw_status_page status_page;
59
60         /** We track the position of the requests in the ring buffer, and
61          * when each is retired we increment last_retired_head as the GPU
62          * must have finished processing the request and so we know we
63          * can advance the ringbuffer up to that position.
64          *
65          * last_retired_head is set to -1 after the value is consumed so
66          * we can detect new retirements.
67          */
68         u32             last_retired_head;
69
70         u32             irq_refcount;           /* protected by dev_priv->irq_lock */
71         u32             irq_enable_mask;        /* bitmask to enable ring interrupt */
72         u32             trace_irq_seqno;
73         u32             sync_seqno[I915_NUM_RINGS-1];
74         bool __must_check (*irq_get)(struct intel_ring_buffer *ring);
75         void            (*irq_put)(struct intel_ring_buffer *ring);
76
77         int             (*init)(struct intel_ring_buffer *ring);
78
79         void            (*write_tail)(struct intel_ring_buffer *ring,
80                                       u32 value);
81         int __must_check (*flush)(struct intel_ring_buffer *ring,
82                                   u32   invalidate_domains,
83                                   u32   flush_domains);
84         int             (*add_request)(struct intel_ring_buffer *ring);
85         /* Some chipsets are not quite as coherent as advertised and need
86          * an expensive kick to force a true read of the up-to-date seqno.
87          * However, the up-to-date seqno is not always required and the last
88          * seen value is good enough. Note that the seqno will always be
89          * monotonic, even if not coherent.
90          */
91         u32             (*get_seqno)(struct intel_ring_buffer *ring,
92                                      bool lazy_coherency);
93         void            (*set_seqno)(struct intel_ring_buffer *ring,
94                                      u32 seqno);
95         int             (*dispatch_execbuffer)(struct intel_ring_buffer *ring,
96                                                u32 offset, u32 length,
97                                                unsigned flags);
98 #define I915_DISPATCH_SECURE 0x1
99 #define I915_DISPATCH_PINNED 0x2
100         void            (*cleanup)(struct intel_ring_buffer *ring);
101         int             (*sync_to)(struct intel_ring_buffer *ring,
102                                    struct intel_ring_buffer *to,
103                                    u32 seqno);
104
105         u32             semaphore_register[3]; /*our mbox written by others */
106         u32             signal_mbox[2]; /* mboxes this ring signals to */
107         /**
108          * List of objects currently involved in rendering from the
109          * ringbuffer.
110          *
111          * Includes buffers having the contents of their GPU caches
112          * flushed, not necessarily primitives.  last_rendering_seqno
113          * represents when the rendering involved will be completed.
114          *
115          * A reference is held on the buffer while on this list.
116          */
117         struct list_head active_list;
118
119         /**
120          * List of breadcrumbs associated with GPU requests currently
121          * outstanding.
122          */
123         struct list_head request_list;
124
125         /**
126          * Do we have some not yet emitted requests outstanding?
127          */
128         u32 outstanding_lazy_request;
129         bool gpu_caches_dirty;
130
131         wait_queue_head_t irq_queue;
132
133         /**
134          * Do an explicit TLB flush before MI_SET_CONTEXT
135          */
136         bool itlb_before_ctx_switch;
137         struct i915_hw_context *default_context;
138         struct drm_i915_gem_object *last_context_obj;
139
140         void *private;
141 };
142
143 static inline bool
144 intel_ring_initialized(struct intel_ring_buffer *ring)
145 {
146         return ring->obj != NULL;
147 }
148
149 static inline unsigned
150 intel_ring_flag(struct intel_ring_buffer *ring)
151 {
152         return 1 << ring->id;
153 }
154
155 static inline u32
156 intel_ring_sync_index(struct intel_ring_buffer *ring,
157                       struct intel_ring_buffer *other)
158 {
159         int idx;
160
161         /*
162          * cs -> 0 = vcs, 1 = bcs
163          * vcs -> 0 = bcs, 1 = cs,
164          * bcs -> 0 = cs, 1 = vcs.
165          */
166
167         idx = (other - ring) - 1;
168         if (idx < 0)
169                 idx += I915_NUM_RINGS;
170
171         return idx;
172 }
173
174 static inline u32
175 intel_read_status_page(struct intel_ring_buffer *ring,
176                        int reg)
177 {
178         /* Ensure that the compiler doesn't optimize away the load. */
179         barrier();
180         return ring->status_page.page_addr[reg];
181 }
182
183 static inline void
184 intel_write_status_page(struct intel_ring_buffer *ring,
185                         int reg, u32 value)
186 {
187         ring->status_page.page_addr[reg] = value;
188 }
189
190 /**
191  * Reads a dword out of the status page, which is written to from the command
192  * queue by automatic updates, MI_REPORT_HEAD, MI_STORE_DATA_INDEX, or
193  * MI_STORE_DATA_IMM.
194  *
195  * The following dwords have a reserved meaning:
196  * 0x00: ISR copy, updated when an ISR bit not set in the HWSTAM changes.
197  * 0x04: ring 0 head pointer
198  * 0x05: ring 1 head pointer (915-class)
199  * 0x06: ring 2 head pointer (915-class)
200  * 0x10-0x1b: Context status DWords (GM45)
201  * 0x1f: Last written status offset. (GM45)
202  *
203  * The area from dword 0x20 to 0x3ff is available for driver usage.
204  */
205 #define I915_GEM_HWS_INDEX              0x20
206 #define I915_GEM_HWS_SCRATCH_INDEX      0x30
207 #define I915_GEM_HWS_SCRATCH_ADDR (I915_GEM_HWS_SCRATCH_INDEX << MI_STORE_DWORD_INDEX_SHIFT)
208
209 void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring);
210
211 int __must_check intel_ring_begin(struct intel_ring_buffer *ring, int n);
212 static inline void intel_ring_emit(struct intel_ring_buffer *ring,
213                                    u32 data)
214 {
215         iowrite32(data, ring->virtual_start + ring->tail);
216         ring->tail += 4;
217 }
218 void intel_ring_advance(struct intel_ring_buffer *ring);
219 int __must_check intel_ring_idle(struct intel_ring_buffer *ring);
220 void intel_ring_init_seqno(struct intel_ring_buffer *ring, u32 seqno);
221 int intel_ring_flush_all_caches(struct intel_ring_buffer *ring);
222 int intel_ring_invalidate_all_caches(struct intel_ring_buffer *ring);
223
224 int intel_init_render_ring_buffer(struct drm_device *dev);
225 int intel_init_bsd_ring_buffer(struct drm_device *dev);
226 int intel_init_blt_ring_buffer(struct drm_device *dev);
227
228 u32 intel_ring_get_active_head(struct intel_ring_buffer *ring);
229 void intel_ring_setup_status_page(struct intel_ring_buffer *ring);
230
231 static inline u32 intel_ring_get_tail(struct intel_ring_buffer *ring)
232 {
233         return ring->tail;
234 }
235
236 static inline u32 intel_ring_get_seqno(struct intel_ring_buffer *ring)
237 {
238         BUG_ON(ring->outstanding_lazy_request == 0);
239         return ring->outstanding_lazy_request;
240 }
241
242 static inline void i915_trace_irq_get(struct intel_ring_buffer *ring, u32 seqno)
243 {
244         if (ring->trace_irq_seqno == 0 && ring->irq_get(ring))
245                 ring->trace_irq_seqno = seqno;
246 }
247
248 /* DRI warts */
249 int intel_render_ring_init_dri(struct drm_device *dev, u64 start, u32 size);
250
251 #endif /* _INTEL_RINGBUFFER_H_ */