1 =========================== 1 ===========================
2 drm/i915 Intel GFX Driver 2 drm/i915 Intel GFX Driver
3 =========================== 3 ===========================
4 4
5 The drm/i915 driver supports all (with the exc 5 The drm/i915 driver supports all (with the exception of some very early
6 models) integrated GFX chipsets with both Inte 6 models) integrated GFX chipsets with both Intel display and rendering
7 blocks. This excludes a set of SoC platforms w 7 blocks. This excludes a set of SoC platforms with an SGX rendering unit,
8 those have basic support through the gma500 dr 8 those have basic support through the gma500 drm driver.
9 9
10 Core Driver Infrastructure 10 Core Driver Infrastructure
11 ========================== 11 ==========================
12 12
13 This section covers core driver infrastructure 13 This section covers core driver infrastructure used by both the display
14 and the GEM parts of the driver. 14 and the GEM parts of the driver.
15 15
16 Runtime Power Management 16 Runtime Power Management
17 ------------------------ 17 ------------------------
18 18
19 .. kernel-doc:: drivers/gpu/drm/i915/intel_run 19 .. kernel-doc:: drivers/gpu/drm/i915/intel_runtime_pm.c
20 :doc: runtime pm 20 :doc: runtime pm
21 21
22 .. kernel-doc:: drivers/gpu/drm/i915/intel_run 22 .. kernel-doc:: drivers/gpu/drm/i915/intel_runtime_pm.c
23 :internal: 23 :internal:
24 24
25 .. kernel-doc:: drivers/gpu/drm/i915/intel_unc 25 .. kernel-doc:: drivers/gpu/drm/i915/intel_uncore.c
26 :internal: 26 :internal:
27 27
28 Interrupt Handling 28 Interrupt Handling
29 ------------------ 29 ------------------
30 30
31 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq. 31 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
32 :doc: interrupt handling 32 :doc: interrupt handling
33 33
34 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq. 34 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
35 :functions: intel_irq_init intel_irq_init_h 35 :functions: intel_irq_init intel_irq_init_hw intel_hpd_init
36 36
37 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq. 37 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
38 :functions: intel_runtime_pm_disable_interr 38 :functions: intel_runtime_pm_disable_interrupts
39 39
40 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq. 40 .. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
41 :functions: intel_runtime_pm_enable_interru 41 :functions: intel_runtime_pm_enable_interrupts
42 42
43 Intel GVT-g Guest Support(vGPU) 43 Intel GVT-g Guest Support(vGPU)
44 ------------------------------- 44 -------------------------------
45 45
46 .. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu 46 .. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu.c
47 :doc: Intel GVT-g guest support 47 :doc: Intel GVT-g guest support
48 48
49 .. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu 49 .. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu.c
50 :internal: 50 :internal:
51 51
52 Intel GVT-g Host Support(vGPU device model) 52 Intel GVT-g Host Support(vGPU device model)
53 ------------------------------------------- 53 -------------------------------------------
54 54
55 .. kernel-doc:: drivers/gpu/drm/i915/intel_gvt 55 .. kernel-doc:: drivers/gpu/drm/i915/intel_gvt.c
56 :doc: Intel GVT-g host support 56 :doc: Intel GVT-g host support
57 57
58 .. kernel-doc:: drivers/gpu/drm/i915/intel_gvt 58 .. kernel-doc:: drivers/gpu/drm/i915/intel_gvt.c
59 :internal: 59 :internal:
60 60
61 Workarounds 61 Workarounds
62 ----------- 62 -----------
63 63
64 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ 64 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_workarounds.c
65 :doc: Hardware workarounds 65 :doc: Hardware workarounds
66 66
67 Display Hardware Handling 67 Display Hardware Handling
68 ========================= 68 =========================
69 69
70 This section covers everything related to the 70 This section covers everything related to the display hardware including
71 the mode setting infrastructure, plane, sprite 71 the mode setting infrastructure, plane, sprite and cursor handling and
72 display, output probing and related topics. 72 display, output probing and related topics.
73 73
74 Mode Setting Infrastructure 74 Mode Setting Infrastructure
75 --------------------------- 75 ---------------------------
76 76
77 The i915 driver is thus far the only DRM drive 77 The i915 driver is thus far the only DRM driver which doesn't use the
78 common DRM helper code to implement mode setti 78 common DRM helper code to implement mode setting sequences. Thus it has
79 its own tailor-made infrastructure for executi 79 its own tailor-made infrastructure for executing a display configuration
80 change. 80 change.
81 81
82 Frontbuffer Tracking 82 Frontbuffer Tracking
83 -------------------- 83 --------------------
84 84
85 .. kernel-doc:: drivers/gpu/drm/i915/display/i 85 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_frontbuffer.c
86 :doc: frontbuffer tracking 86 :doc: frontbuffer tracking
87 87
88 .. kernel-doc:: drivers/gpu/drm/i915/display/i 88 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_frontbuffer.h
89 :internal: 89 :internal:
90 90
91 .. kernel-doc:: drivers/gpu/drm/i915/display/i 91 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_frontbuffer.c
92 :internal: 92 :internal:
93 93
94 Display FIFO Underrun Reporting 94 Display FIFO Underrun Reporting
95 ------------------------------- 95 -------------------------------
96 96
97 .. kernel-doc:: drivers/gpu/drm/i915/display/i 97 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_fifo_underrun.c
98 :doc: fifo underrun handling 98 :doc: fifo underrun handling
99 99
100 .. kernel-doc:: drivers/gpu/drm/i915/display/i 100 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_fifo_underrun.c
101 :internal: 101 :internal:
102 102
103 Plane Configuration 103 Plane Configuration
104 ------------------- 104 -------------------
105 105
106 This section covers plane configuration and co 106 This section covers plane configuration and composition with the primary
107 plane, sprites, cursors and overlays. This inc 107 plane, sprites, cursors and overlays. This includes the infrastructure
108 to do atomic vsync'ed updates of all this stat 108 to do atomic vsync'ed updates of all this state and also tightly coupled
109 topics like watermark setup and computation, f 109 topics like watermark setup and computation, framebuffer compression and
110 panel self refresh. 110 panel self refresh.
111 111
112 Atomic Plane Helpers 112 Atomic Plane Helpers
113 -------------------- 113 --------------------
114 114
115 .. kernel-doc:: drivers/gpu/drm/i915/display/i 115 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_atomic_plane.c
116 :doc: atomic plane helpers 116 :doc: atomic plane helpers
117 117
118 .. kernel-doc:: drivers/gpu/drm/i915/display/i 118 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_atomic_plane.c
119 :internal: 119 :internal:
120 120
121 Asynchronous Page Flip <<
122 ---------------------- <<
123 <<
124 .. kernel-doc:: drivers/gpu/drm/i915/display/i <<
125 :doc: asynchronous flip implementation <<
126 <<
127 Output Probing 121 Output Probing
128 -------------- 122 --------------
129 123
130 This section covers output probing and related 124 This section covers output probing and related infrastructure like the
131 hotplug interrupt storm detection and mitigati 125 hotplug interrupt storm detection and mitigation code. Note that the
132 i915 driver still uses most of the common DRM 126 i915 driver still uses most of the common DRM helper code for output
133 probing, so those sections fully apply. 127 probing, so those sections fully apply.
134 128
135 Hotplug 129 Hotplug
136 ------- 130 -------
137 131
138 .. kernel-doc:: drivers/gpu/drm/i915/display/i 132 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_hotplug.c
139 :doc: Hotplug 133 :doc: Hotplug
140 134
141 .. kernel-doc:: drivers/gpu/drm/i915/display/i 135 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_hotplug.c
142 :internal: 136 :internal:
143 137
144 High Definition Audio 138 High Definition Audio
145 --------------------- 139 ---------------------
146 140
147 .. kernel-doc:: drivers/gpu/drm/i915/display/i 141 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_audio.c
148 :doc: High Definition Audio over HDMI and D 142 :doc: High Definition Audio over HDMI and Display Port
149 143
150 .. kernel-doc:: drivers/gpu/drm/i915/display/i 144 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_audio.c
151 :internal: 145 :internal:
152 146
153 .. kernel-doc:: include/drm/intel/i915_compone !! 147 .. kernel-doc:: include/drm/i915_component.h
154 :internal: 148 :internal:
155 149
156 Intel HDMI LPE Audio Support 150 Intel HDMI LPE Audio Support
157 ---------------------------- 151 ----------------------------
158 152
159 .. kernel-doc:: drivers/gpu/drm/i915/display/i 153 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_lpe_audio.c
160 :doc: LPE Audio integration for HDMI or DP 154 :doc: LPE Audio integration for HDMI or DP playback
161 155
162 .. kernel-doc:: drivers/gpu/drm/i915/display/i 156 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_lpe_audio.c
163 :internal: 157 :internal:
164 158
165 Panel Self Refresh PSR (PSR/SRD) 159 Panel Self Refresh PSR (PSR/SRD)
166 -------------------------------- 160 --------------------------------
167 161
168 .. kernel-doc:: drivers/gpu/drm/i915/display/i 162 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_psr.c
169 :doc: Panel Self Refresh (PSR/SRD) 163 :doc: Panel Self Refresh (PSR/SRD)
170 164
171 .. kernel-doc:: drivers/gpu/drm/i915/display/i 165 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_psr.c
172 :internal: 166 :internal:
173 167
174 Frame Buffer Compression (FBC) 168 Frame Buffer Compression (FBC)
175 ------------------------------ 169 ------------------------------
176 170
177 .. kernel-doc:: drivers/gpu/drm/i915/display/i 171 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_fbc.c
178 :doc: Frame Buffer Compression (FBC) 172 :doc: Frame Buffer Compression (FBC)
179 173
180 .. kernel-doc:: drivers/gpu/drm/i915/display/i 174 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_fbc.c
181 :internal: 175 :internal:
182 176
183 Display Refresh Rate Switching (DRRS) 177 Display Refresh Rate Switching (DRRS)
184 ------------------------------------- 178 -------------------------------------
185 179
186 .. kernel-doc:: drivers/gpu/drm/i915/display/i !! 180 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
187 :doc: Display Refresh Rate Switching (DRRS) 181 :doc: Display Refresh Rate Switching (DRRS)
188 182
189 .. kernel-doc:: drivers/gpu/drm/i915/display/i !! 183 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
190 :internal: !! 184 :functions: intel_dp_set_drrs_state
>> 185
>> 186 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
>> 187 :functions: intel_edp_drrs_enable
>> 188
>> 189 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
>> 190 :functions: intel_edp_drrs_disable
>> 191
>> 192 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
>> 193 :functions: intel_edp_drrs_invalidate
>> 194
>> 195 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
>> 196 :functions: intel_edp_drrs_flush
>> 197
>> 198 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
>> 199 :functions: intel_dp_drrs_init
191 200
192 DPIO 201 DPIO
193 ---- 202 ----
194 203
195 .. kernel-doc:: drivers/gpu/drm/i915/display/i 204 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpio_phy.c
196 :doc: DPIO 205 :doc: DPIO
197 206
198 DMC Firmware Support !! 207 CSR firmware support for DMC
199 -------------------- !! 208 ----------------------------
200 209
201 .. kernel-doc:: drivers/gpu/drm/i915/display/i !! 210 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_csr.c
202 :doc: DMC Firmware Support !! 211 :doc: csr support for dmc
203 212
204 .. kernel-doc:: drivers/gpu/drm/i915/display/i !! 213 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_csr.c
205 :internal: 214 :internal:
206 215
207 DMC wakelock support <<
208 -------------------- <<
209 <<
210 .. kernel-doc:: drivers/gpu/drm/i915/display/i <<
211 :doc: DMC wakelock support <<
212 <<
213 Video BIOS Table (VBT) 216 Video BIOS Table (VBT)
214 ---------------------- 217 ----------------------
215 218
216 .. kernel-doc:: drivers/gpu/drm/i915/display/i 219 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_bios.c
217 :doc: Video BIOS Table (VBT) 220 :doc: Video BIOS Table (VBT)
218 221
219 .. kernel-doc:: drivers/gpu/drm/i915/display/i 222 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_bios.c
220 :internal: 223 :internal:
221 224
222 .. kernel-doc:: drivers/gpu/drm/i915/display/i 225 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_vbt_defs.h
223 :internal: 226 :internal:
224 227
225 Display clocks 228 Display clocks
226 -------------- 229 --------------
227 230
228 .. kernel-doc:: drivers/gpu/drm/i915/display/i 231 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_cdclk.c
229 :doc: CDCLK / RAWCLK 232 :doc: CDCLK / RAWCLK
230 233
231 .. kernel-doc:: drivers/gpu/drm/i915/display/i 234 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_cdclk.c
232 :internal: 235 :internal:
233 236
234 Display PLLs 237 Display PLLs
235 ------------ 238 ------------
236 239
237 .. kernel-doc:: drivers/gpu/drm/i915/display/i 240 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpll_mgr.c
238 :doc: Display PLLs 241 :doc: Display PLLs
239 242
240 .. kernel-doc:: drivers/gpu/drm/i915/display/i 243 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpll_mgr.c
241 :internal: 244 :internal:
242 245
243 .. kernel-doc:: drivers/gpu/drm/i915/display/i 246 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpll_mgr.h
244 :internal: 247 :internal:
245 248
246 Display State Buffer 249 Display State Buffer
247 -------------------- 250 --------------------
248 251
249 .. kernel-doc:: drivers/gpu/drm/i915/display/i 252 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dsb.c
250 :doc: DSB 253 :doc: DSB
251 254
252 .. kernel-doc:: drivers/gpu/drm/i915/display/i 255 .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dsb.c
253 :internal: 256 :internal:
254 257
255 GT Programming <<
256 ============== <<
257 <<
258 Multicast/Replicated (MCR) Registers <<
259 ------------------------------------ <<
260 <<
261 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ <<
262 :doc: GT Multicast/Replicated (MCR) Registe <<
263 <<
264 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ <<
265 :internal: <<
266 <<
267 Memory Management and Command Submission 258 Memory Management and Command Submission
268 ======================================== 259 ========================================
269 260
270 This sections covers all things related to the 261 This sections covers all things related to the GEM implementation in the
271 i915 driver. 262 i915 driver.
272 263
273 Intel GPU Basics 264 Intel GPU Basics
274 ---------------- 265 ----------------
275 266
276 An Intel GPU has multiple engines. There are s !! 267 An Intel GPU has multiple engines. There are several engine types.
277 268
278 - Render Command Streamer (RCS). An engine for !! 269 - RCS engine is for rendering 3D and performing compute, this is named
279 performing compute. !! 270 `I915_EXEC_RENDER` in user space.
280 - Blitting Command Streamer (BCS). An engine f !! 271 - BCS is a blitting (copy) engine, this is named `I915_EXEC_BLT` in user
281 copying operations. !! 272 space.
282 - Video Command Streamer. An engine used for v !! 273 - VCS is a video encode and decode engine, this is named `I915_EXEC_BSD`
283 sometimes called 'BSD' in hardware documenta !! 274 in user space
284 - Video Enhancement Command Streamer (VECS). A !! 275 - VECS is video enhancement engine, this is named `I915_EXEC_VEBOX` in user
285 Also sometimes called 'VEBOX' in hardware do !! 276 space.
286 - Compute Command Streamer (CCS). An engine th !! 277 - The enumeration `I915_EXEC_DEFAULT` does not refer to specific engine;
287 GPGPU pipelines, but not the 3D pipeline. !! 278 instead it is to be used by user space to specify a default rendering
288 - Graphics Security Controller (GSCCS). A dedi !! 279 engine (for 3D) that may or may not be the same as RCS.
289 communication with GSC controller on securit <<
290 High-bandwidth Digital Content Protection (H <<
291 and HuC firmware authentication. <<
292 280
293 The Intel GPU family is a family of integrated 281 The Intel GPU family is a family of integrated GPU's using Unified
294 Memory Access. For having the GPU "do work", u 282 Memory Access. For having the GPU "do work", user space will feed the
295 GPU batch buffers via one of the ioctls `DRM_I 283 GPU batch buffers via one of the ioctls `DRM_IOCTL_I915_GEM_EXECBUFFER2`
296 or `DRM_IOCTL_I915_GEM_EXECBUFFER2_WR`. Most s 284 or `DRM_IOCTL_I915_GEM_EXECBUFFER2_WR`. Most such batchbuffers will
297 instruct the GPU to perform work (for example 285 instruct the GPU to perform work (for example rendering) and that work
298 needs memory from which to read and memory to 286 needs memory from which to read and memory to which to write. All memory
299 is encapsulated within GEM buffer objects (usu 287 is encapsulated within GEM buffer objects (usually created with the ioctl
300 `DRM_IOCTL_I915_GEM_CREATE`). An ioctl providi 288 `DRM_IOCTL_I915_GEM_CREATE`). An ioctl providing a batchbuffer for the GPU
301 to create will also list all GEM buffer object 289 to create will also list all GEM buffer objects that the batchbuffer reads
302 and/or writes. For implementation details of m 290 and/or writes. For implementation details of memory management see
303 `GEM BO Management Implementation Details`_. 291 `GEM BO Management Implementation Details`_.
304 292
305 The i915 driver allows user space to create a 293 The i915 driver allows user space to create a context via the ioctl
306 `DRM_IOCTL_I915_GEM_CONTEXT_CREATE` which is i 294 `DRM_IOCTL_I915_GEM_CONTEXT_CREATE` which is identified by a 32-bit
307 integer. Such a context should be viewed by us 295 integer. Such a context should be viewed by user-space as -loosely-
308 analogous to the idea of a CPU process of an o 296 analogous to the idea of a CPU process of an operating system. The i915
309 driver guarantees that commands issued to a fi 297 driver guarantees that commands issued to a fixed context are to be
310 executed so that writes of a previously issued 298 executed so that writes of a previously issued command are seen by
311 reads of following commands. Actions issued be 299 reads of following commands. Actions issued between different contexts
312 (even if from the same file descriptor) are NO 300 (even if from the same file descriptor) are NOT given that guarantee
313 and the only way to synchronize across context 301 and the only way to synchronize across contexts (even from the same
314 file descriptor) is through the use of fences. 302 file descriptor) is through the use of fences. At least as far back as
315 Gen4, also have that a context carries with it 303 Gen4, also have that a context carries with it a GPU HW context;
316 the HW context is essentially (most of at leas !! 304 the HW context is essentially (most of atleast) the state of a GPU.
317 In addition to the ordering guarantees, the ke 305 In addition to the ordering guarantees, the kernel will restore GPU
318 state via HW context when commands are issued 306 state via HW context when commands are issued to a context, this saves
319 user space the need to restore (most of at lea !! 307 user space the need to restore (most of atleast) the GPU state at the
320 start of each batchbuffer. The non-deprecated 308 start of each batchbuffer. The non-deprecated ioctls to submit batchbuffer
321 work can pass that ID (in the lower bits of dr 309 work can pass that ID (in the lower bits of drm_i915_gem_execbuffer2::rsvd1)
322 to identify what context to use with the comma 310 to identify what context to use with the command.
323 311
324 The GPU has its own memory management and addr 312 The GPU has its own memory management and address space. The kernel
325 driver maintains the memory translation table 313 driver maintains the memory translation table for the GPU. For older
326 GPUs (i.e. those before Gen8), there is a sing 314 GPUs (i.e. those before Gen8), there is a single global such translation
327 table, a global Graphics Translation Table (GT 315 table, a global Graphics Translation Table (GTT). For newer generation
328 GPUs each context has its own translation tabl 316 GPUs each context has its own translation table, called Per-Process
329 Graphics Translation Table (PPGTT). Of importa 317 Graphics Translation Table (PPGTT). Of important note, is that although
330 PPGTT is named per-process it is actually per 318 PPGTT is named per-process it is actually per context. When user space
331 submits a batchbuffer, the kernel walks the li 319 submits a batchbuffer, the kernel walks the list of GEM buffer objects
332 used by the batchbuffer and guarantees that no 320 used by the batchbuffer and guarantees that not only is the memory of
333 each such GEM buffer object resident but it is 321 each such GEM buffer object resident but it is also present in the
334 (PP)GTT. If the GEM buffer object is not yet p 322 (PP)GTT. If the GEM buffer object is not yet placed in the (PP)GTT,
335 then it is given an address. Two consequences 323 then it is given an address. Two consequences of this are: the kernel
336 needs to edit the batchbuffer submitted to wri 324 needs to edit the batchbuffer submitted to write the correct value of
337 the GPU address when a GEM BO is assigned a GP 325 the GPU address when a GEM BO is assigned a GPU address and the kernel
338 might evict a different GEM BO from the (PP)GT 326 might evict a different GEM BO from the (PP)GTT to make address room
339 for another GEM BO. Consequently, the ioctls s 327 for another GEM BO. Consequently, the ioctls submitting a batchbuffer
340 for execution also include a list of all locat 328 for execution also include a list of all locations within buffers that
341 refer to GPU-addresses so that the kernel can 329 refer to GPU-addresses so that the kernel can edit the buffer correctly.
342 This process is dubbed relocation. 330 This process is dubbed relocation.
343 331
344 Locking Guidelines 332 Locking Guidelines
345 ------------------ 333 ------------------
346 334
347 .. note:: 335 .. note::
348 This is a description of how the locking sh 336 This is a description of how the locking should be after
349 refactoring is done. Does not necessarily r 337 refactoring is done. Does not necessarily reflect what the locking
350 looks like while WIP. 338 looks like while WIP.
351 339
352 #. All locking rules and interface contracts w 340 #. All locking rules and interface contracts with cross-driver interfaces
353 (dma-buf, dma_fence) need to be followed. 341 (dma-buf, dma_fence) need to be followed.
354 342
355 #. No struct_mutex anywhere in the code 343 #. No struct_mutex anywhere in the code
356 344
357 #. dma_resv will be the outermost lock (when n 345 #. dma_resv will be the outermost lock (when needed) and ww_acquire_ctx
358 is to be hoisted at highest level and passe 346 is to be hoisted at highest level and passed down within i915_gem_ctx
359 in the call chain 347 in the call chain
360 348
361 #. While holding lru/memory manager (buddy, dr 349 #. While holding lru/memory manager (buddy, drm_mm, whatever) locks
362 system memory allocations are not allowed 350 system memory allocations are not allowed
363 351
364 * Enforce this by priming lockdep (wit 352 * Enforce this by priming lockdep (with fs_reclaim). If we
365 allocate memory while holding these 353 allocate memory while holding these looks we get a rehash
366 of the shrinker vs. struct_mutex sag 354 of the shrinker vs. struct_mutex saga, and that would be
367 real bad. 355 real bad.
368 356
369 #. Do not nest different lru/memory manager lo 357 #. Do not nest different lru/memory manager locks within each other.
370 Take them in turn to update memory allocati 358 Take them in turn to update memory allocations, relying on the object’s
371 dma_resv ww_mutex to serialize against othe 359 dma_resv ww_mutex to serialize against other operations.
372 360
373 #. The suggestion for lru/memory managers lock 361 #. The suggestion for lru/memory managers locks is that they are small
374 enough to be spinlocks. 362 enough to be spinlocks.
375 363
376 #. All features need to come with exhaustive k 364 #. All features need to come with exhaustive kernel selftests and/or
377 IGT tests when appropriate 365 IGT tests when appropriate
378 366
379 #. All LMEM uAPI paths need to be fully restar 367 #. All LMEM uAPI paths need to be fully restartable (_interruptible()
380 for all locks/waits/sleeps) 368 for all locks/waits/sleeps)
381 369
382 * Error handling validation through si 370 * Error handling validation through signal injection.
383 Still the best strategy we have for 371 Still the best strategy we have for validating GEM uAPI
384 corner cases. 372 corner cases.
385 Must be excessively used in the IGT, 373 Must be excessively used in the IGT, and we need to check
386 that we really have full path covera 374 that we really have full path coverage of all error cases.
387 375
388 * -EDEADLK handling with ww_mutex 376 * -EDEADLK handling with ww_mutex
389 377
390 GEM BO Management Implementation Details 378 GEM BO Management Implementation Details
391 ---------------------------------------- 379 ----------------------------------------
392 380
393 .. kernel-doc:: drivers/gpu/drm/i915/i915_vma_ 381 .. kernel-doc:: drivers/gpu/drm/i915/i915_vma_types.h
394 :doc: Virtual Memory Address 382 :doc: Virtual Memory Address
395 383
396 Buffer Object Eviction 384 Buffer Object Eviction
397 ---------------------- 385 ----------------------
398 386
399 This section documents the interface functions 387 This section documents the interface functions for evicting buffer
400 objects to make space available in the virtual 388 objects to make space available in the virtual gpu address spaces. Note
401 that this is mostly orthogonal to shrinking bu 389 that this is mostly orthogonal to shrinking buffer objects caches, which
402 has the goal to make main memory (shared with 390 has the goal to make main memory (shared with the gpu through the
403 unified memory architecture) available. 391 unified memory architecture) available.
404 392
405 .. kernel-doc:: drivers/gpu/drm/i915/i915_gem_ 393 .. kernel-doc:: drivers/gpu/drm/i915/i915_gem_evict.c
406 :internal: 394 :internal:
407 395
408 Buffer Object Memory Shrinking 396 Buffer Object Memory Shrinking
409 ------------------------------ 397 ------------------------------
410 398
411 This section documents the interface function 399 This section documents the interface function for shrinking memory usage
412 of buffer object caches. Shrinking is used to 400 of buffer object caches. Shrinking is used to make main memory
413 available. Note that this is mostly orthogonal 401 available. Note that this is mostly orthogonal to evicting buffer
414 objects, which has the goal to make space in g 402 objects, which has the goal to make space in gpu virtual address spaces.
415 403
416 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_ 404 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
417 :internal: 405 :internal:
418 406
419 Batchbuffer Parsing 407 Batchbuffer Parsing
420 ------------------- 408 -------------------
421 409
422 .. kernel-doc:: drivers/gpu/drm/i915/i915_cmd_ 410 .. kernel-doc:: drivers/gpu/drm/i915/i915_cmd_parser.c
423 :doc: batch buffer command parser 411 :doc: batch buffer command parser
424 412
425 .. kernel-doc:: drivers/gpu/drm/i915/i915_cmd_ 413 .. kernel-doc:: drivers/gpu/drm/i915/i915_cmd_parser.c
426 :internal: 414 :internal:
427 415
428 User Batchbuffer Execution 416 User Batchbuffer Execution
429 -------------------------- 417 --------------------------
430 418
431 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_ <<
432 <<
433 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_ 419 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
434 :doc: User command execution 420 :doc: User command execution
435 421
436 Scheduling <<
437 ---------- <<
438 .. kernel-doc:: drivers/gpu/drm/i915/i915_sche <<
439 :functions: i915_sched_engine <<
440 <<
441 Logical Rings, Logical Ring Contexts and Execl 422 Logical Rings, Logical Ring Contexts and Execlists
442 ---------------------------------------------- 423 --------------------------------------------------
443 424
444 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ !! 425 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_lrc.c
445 :doc: Logical Rings, Logical Ring Contexts 426 :doc: Logical Rings, Logical Ring Contexts and Execlists
446 427
447 Global GTT views 428 Global GTT views
448 ---------------- 429 ----------------
449 430
450 .. kernel-doc:: drivers/gpu/drm/i915/i915_vma_ 431 .. kernel-doc:: drivers/gpu/drm/i915/i915_vma_types.h
451 :doc: Global GTT views 432 :doc: Global GTT views
452 433
453 .. kernel-doc:: drivers/gpu/drm/i915/i915_gem_ 434 .. kernel-doc:: drivers/gpu/drm/i915/i915_gem_gtt.c
454 :internal: 435 :internal:
455 436
456 GTT Fences and Swizzling 437 GTT Fences and Swizzling
457 ------------------------ 438 ------------------------
458 439
459 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ 440 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c
460 :internal: 441 :internal:
461 442
462 Global GTT Fence Handling 443 Global GTT Fence Handling
463 ~~~~~~~~~~~~~~~~~~~~~~~~~ 444 ~~~~~~~~~~~~~~~~~~~~~~~~~
464 445
465 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ 446 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c
466 :doc: fence register handling 447 :doc: fence register handling
467 448
468 Hardware Tiling and Swizzling Details 449 Hardware Tiling and Swizzling Details
469 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 450 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
470 451
471 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ 452 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c
472 :doc: tiling swizzling details 453 :doc: tiling swizzling details
473 454
474 Object Tiling IOCTLs 455 Object Tiling IOCTLs
475 -------------------- 456 --------------------
476 457
477 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_ 458 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_tiling.c
478 :internal: 459 :internal:
479 460
480 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_ 461 .. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_tiling.c
481 :doc: buffer object tiling 462 :doc: buffer object tiling
482 463
483 Protected Objects <<
484 ----------------- <<
485 <<
486 .. kernel-doc:: drivers/gpu/drm/i915/pxp/intel <<
487 :doc: PXP <<
488 <<
489 .. kernel-doc:: drivers/gpu/drm/i915/pxp/intel <<
490 <<
491 Microcontrollers 464 Microcontrollers
492 ================ 465 ================
493 466
494 Starting from gen9, three microcontrollers are 467 Starting from gen9, three microcontrollers are available on the HW: the
495 graphics microcontroller (GuC), the HEVC/H.265 468 graphics microcontroller (GuC), the HEVC/H.265 microcontroller (HuC) and the
496 display microcontroller (DMC). The driver is r 469 display microcontroller (DMC). The driver is responsible for loading the
497 firmwares on the microcontrollers; the GuC and 470 firmwares on the microcontrollers; the GuC and HuC firmwares are transferred
498 to WOPCM using the DMA engine, while the DMC f 471 to WOPCM using the DMA engine, while the DMC firmware is written through MMIO.
499 472
500 WOPCM 473 WOPCM
501 ----- 474 -----
502 475
503 WOPCM Layout 476 WOPCM Layout
504 ~~~~~~~~~~~~ 477 ~~~~~~~~~~~~
505 478
506 .. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ !! 479 .. kernel-doc:: drivers/gpu/drm/i915/intel_wopcm.c
507 :doc: WOPCM Layout 480 :doc: WOPCM Layout
508 481
509 GuC 482 GuC
510 --- 483 ---
511 484
512 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int 485 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc.c
513 :doc: GuC 486 :doc: GuC
514 487
515 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int <<
516 <<
517 GuC Firmware Layout 488 GuC Firmware Layout
518 ~~~~~~~~~~~~~~~~~~~ 489 ~~~~~~~~~~~~~~~~~~~
519 490
520 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int 491 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_uc_fw_abi.h
521 :doc: Firmware Layout 492 :doc: Firmware Layout
522 493
523 GuC Memory Management 494 GuC Memory Management
524 ~~~~~~~~~~~~~~~~~~~~~ 495 ~~~~~~~~~~~~~~~~~~~~~
525 496
526 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int 497 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc.c
527 :doc: GuC Memory Management 498 :doc: GuC Memory Management
528 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int 499 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc.c
529 :functions: intel_guc_allocate_vma 500 :functions: intel_guc_allocate_vma
530 501
531 502
532 GuC-specific firmware loader 503 GuC-specific firmware loader
533 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 504 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
534 505
535 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int 506 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c
536 :internal: 507 :internal:
537 508
538 GuC-based command submission 509 GuC-based command submission
539 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 510 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
540 511
541 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int 512 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
542 :doc: GuC-based command submission 513 :doc: GuC-based command submission
543 514
544 GuC ABI <<
545 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <<
546 <<
547 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi <<
548 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi <<
549 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi <<
550 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi <<
551 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi <<
552 <<
553 HuC 515 HuC
554 --- 516 ---
555 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int 517 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_huc.c
556 :doc: HuC 518 :doc: HuC
557 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int 519 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_huc.c
558 :functions: intel_huc_auth 520 :functions: intel_huc_auth
559 521
560 HuC Memory Management 522 HuC Memory Management
561 ~~~~~~~~~~~~~~~~~~~~~ 523 ~~~~~~~~~~~~~~~~~~~~~
562 524
563 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/int 525 .. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_huc.c
564 :doc: HuC Memory Management 526 :doc: HuC Memory Management
565 527
566 HuC Firmware Layout 528 HuC Firmware Layout
567 ~~~~~~~~~~~~~~~~~~~ 529 ~~~~~~~~~~~~~~~~~~~
568 The HuC FW layout is the same as the GuC one, 530 The HuC FW layout is the same as the GuC one, see `GuC Firmware Layout`_
569 531
570 DMC 532 DMC
571 --- 533 ---
572 See `DMC Firmware Support`_ !! 534 See `CSR firmware support for DMC`_
573 535
574 Tracing 536 Tracing
575 ======= 537 =======
576 538
577 This sections covers all things related to the 539 This sections covers all things related to the tracepoints implemented
578 in the i915 driver. 540 in the i915 driver.
579 541
580 i915_ppgtt_create and i915_ppgtt_release 542 i915_ppgtt_create and i915_ppgtt_release
581 ---------------------------------------- 543 ----------------------------------------
582 544
583 .. kernel-doc:: drivers/gpu/drm/i915/i915_trac 545 .. kernel-doc:: drivers/gpu/drm/i915/i915_trace.h
584 :doc: i915_ppgtt_create and i915_ppgtt_rele 546 :doc: i915_ppgtt_create and i915_ppgtt_release tracepoints
585 547
586 i915_context_create and i915_context_free 548 i915_context_create and i915_context_free
587 ----------------------------------------- 549 -----------------------------------------
588 550
589 .. kernel-doc:: drivers/gpu/drm/i915/i915_trac 551 .. kernel-doc:: drivers/gpu/drm/i915/i915_trace.h
590 :doc: i915_context_create and i915_context_ 552 :doc: i915_context_create and i915_context_free tracepoints
591 553
592 Perf 554 Perf
593 ==== 555 ====
594 556
595 Overview 557 Overview
596 -------- 558 --------
597 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 559 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
598 :doc: i915 Perf Overview 560 :doc: i915 Perf Overview
599 561
600 Comparison with Core Perf 562 Comparison with Core Perf
601 ------------------------- 563 -------------------------
602 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 564 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
603 :doc: i915 Perf History and Comparison with 565 :doc: i915 Perf History and Comparison with Core Perf
604 566
605 i915 Driver Entry Points 567 i915 Driver Entry Points
606 ------------------------ 568 ------------------------
607 569
608 This section covers the entrypoints exported o 570 This section covers the entrypoints exported outside of i915_perf.c to
609 integrate with drm/i915 and to handle the `DRM 571 integrate with drm/i915 and to handle the `DRM_I915_PERF_OPEN` ioctl.
610 572
611 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 573 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
612 :functions: i915_perf_init 574 :functions: i915_perf_init
613 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 575 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
614 :functions: i915_perf_fini 576 :functions: i915_perf_fini
615 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 577 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
616 :functions: i915_perf_register 578 :functions: i915_perf_register
617 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 579 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
618 :functions: i915_perf_unregister 580 :functions: i915_perf_unregister
619 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 581 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
620 :functions: i915_perf_open_ioctl 582 :functions: i915_perf_open_ioctl
621 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 583 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
622 :functions: i915_perf_release 584 :functions: i915_perf_release
623 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 585 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
624 :functions: i915_perf_add_config_ioctl 586 :functions: i915_perf_add_config_ioctl
625 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 587 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
626 :functions: i915_perf_remove_config_ioctl 588 :functions: i915_perf_remove_config_ioctl
627 589
628 i915 Perf Stream 590 i915 Perf Stream
629 ---------------- 591 ----------------
630 592
631 This section covers the stream-semantics-agnos 593 This section covers the stream-semantics-agnostic structures and functions
632 for representing an i915 perf stream FD and as 594 for representing an i915 perf stream FD and associated file operations.
633 595
634 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 596 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf_types.h
635 :functions: i915_perf_stream 597 :functions: i915_perf_stream
636 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 598 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf_types.h
637 :functions: i915_perf_stream_ops 599 :functions: i915_perf_stream_ops
638 600
639 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 601 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
640 :functions: read_properties_unlocked 602 :functions: read_properties_unlocked
641 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 603 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
642 :functions: i915_perf_open_ioctl_locked 604 :functions: i915_perf_open_ioctl_locked
643 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 605 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
644 :functions: i915_perf_destroy_locked 606 :functions: i915_perf_destroy_locked
645 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 607 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
646 :functions: i915_perf_read 608 :functions: i915_perf_read
647 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 609 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
648 :functions: i915_perf_ioctl 610 :functions: i915_perf_ioctl
649 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 611 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
650 :functions: i915_perf_enable_locked 612 :functions: i915_perf_enable_locked
651 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 613 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
652 :functions: i915_perf_disable_locked 614 :functions: i915_perf_disable_locked
653 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 615 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
654 :functions: i915_perf_poll 616 :functions: i915_perf_poll
655 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 617 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
656 :functions: i915_perf_poll_locked 618 :functions: i915_perf_poll_locked
657 619
658 i915 Perf Observation Architecture Stream 620 i915 Perf Observation Architecture Stream
659 ----------------------------------------- 621 -----------------------------------------
660 622
661 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 623 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf_types.h
662 :functions: i915_oa_ops 624 :functions: i915_oa_ops
663 625
664 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 626 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
665 :functions: i915_oa_stream_init 627 :functions: i915_oa_stream_init
666 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 628 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
667 :functions: i915_oa_read 629 :functions: i915_oa_read
668 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 630 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
669 :functions: i915_oa_stream_enable 631 :functions: i915_oa_stream_enable
670 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 632 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
671 :functions: i915_oa_stream_disable 633 :functions: i915_oa_stream_disable
672 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 634 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
673 :functions: i915_oa_wait_unlocked 635 :functions: i915_oa_wait_unlocked
674 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 636 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
675 :functions: i915_oa_poll_wait 637 :functions: i915_oa_poll_wait
676 638
677 Other i915 Perf Internals 639 Other i915 Perf Internals
678 ------------------------- 640 -------------------------
679 641
680 This section simply includes all other current 642 This section simply includes all other currently documented i915 perf internals,
681 in no particular order, but may include some m 643 in no particular order, but may include some more minor utilities or platform
682 specific details than found in the more high-l 644 specific details than found in the more high-level sections.
683 645
684 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf 646 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
685 :internal: 647 :internal:
686 :no-identifiers: 648 :no-identifiers:
687 i915_perf_init 649 i915_perf_init
688 i915_perf_fini 650 i915_perf_fini
689 i915_perf_register 651 i915_perf_register
690 i915_perf_unregister 652 i915_perf_unregister
691 i915_perf_open_ioctl 653 i915_perf_open_ioctl
692 i915_perf_release 654 i915_perf_release
693 i915_perf_add_config_ioctl 655 i915_perf_add_config_ioctl
694 i915_perf_remove_config_ioctl 656 i915_perf_remove_config_ioctl
695 read_properties_unlocked 657 read_properties_unlocked
696 i915_perf_open_ioctl_locked 658 i915_perf_open_ioctl_locked
697 i915_perf_destroy_locked 659 i915_perf_destroy_locked
698 i915_perf_read i915_perf_ioctl 660 i915_perf_read i915_perf_ioctl
699 i915_perf_enable_locked 661 i915_perf_enable_locked
700 i915_perf_disable_locked 662 i915_perf_disable_locked
701 i915_perf_poll i915_perf_poll_locked 663 i915_perf_poll i915_perf_poll_locked
702 i915_oa_stream_init i915_oa_read 664 i915_oa_stream_init i915_oa_read
703 i915_oa_stream_enable 665 i915_oa_stream_enable
704 i915_oa_stream_disable 666 i915_oa_stream_disable
705 i915_oa_wait_unlocked 667 i915_oa_wait_unlocked
706 i915_oa_poll_wait 668 i915_oa_poll_wait
707 669
708 Style 670 Style
709 ===== 671 =====
710 672
711 The drm/i915 driver codebase has some style ru 673 The drm/i915 driver codebase has some style rules in addition to (and, in some
712 cases, deviating from) the kernel coding style 674 cases, deviating from) the kernel coding style.
713 675
714 Register macro definition style 676 Register macro definition style
715 ------------------------------- 677 -------------------------------
716 678
717 The style guide for ``i915_reg.h``. 679 The style guide for ``i915_reg.h``.
718 680
719 .. kernel-doc:: drivers/gpu/drm/i915/i915_reg. 681 .. kernel-doc:: drivers/gpu/drm/i915/i915_reg.h
720 :doc: The i915 register macro definition st 682 :doc: The i915 register macro definition style guide
721 <<
722 .. _i915-usage-stats: <<
723 <<
724 i915 DRM client usage stats implementation <<
725 ========================================== <<
726 <<
727 The drm/i915 driver implements the DRM client <<
728 documented in :ref:`drm-client-usage-stats`. <<
729 <<
730 Example of the output showing the implemented <<
731 the currently possible format options: <<
732 <<
733 :: <<
734 <<
735 pos: 0 <<
736 flags: 0100002 <<
737 mnt_id: 21 <<
738 drm-driver: i915 <<
739 drm-pdev: 0000:00:02.0 <<
740 drm-client-id: 7 <<
741 drm-engine-render: 9288864723 ns <<
742 drm-engine-copy: 2035071108 ns <<
743 drm-engine-video: 0 ns <<
744 drm-engine-capacity-video: 2 <<
745 drm-engine-video-enhance: 0 ns <<
746 <<
747 Possible `drm-engine-` key names are: `render` <<
748 `video-enhance`. <<
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