drivers/gpu/drm/i915/i915_gem_context.h

   1 /*
   2  * Copyright © 2016 Intel Corporation
   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
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #ifndef __I915_GEM_CONTEXT_H__
  26 #define __I915_GEM_CONTEXT_H__
  27
  28 #include <linux/bitops.h>
  29 #include <linux/list.h>
  30
  31 struct pid;
  32
  33 struct drm_device;
  34 struct drm_file;
  35
  36 struct drm_i915_private;
  37 struct drm_i915_file_private;
  38 struct i915_hw_ppgtt;
  39 struct i915_vma;
  40 struct intel_ring;
  41
  42 #define DEFAULT_CONTEXT_HANDLE 0
  43
  44 /**
  45  * struct i915_gem_context - client state
  46  *
  47  * The struct i915_gem_context represents the combined view of the driver and
  48  * logical hardware state for a particular client.
  49  */
  50 struct i915_gem_context {
  51         /** i915: i915 device backpointer */
  52         struct drm_i915_private *i915;
  53
  54         /** file_priv: owning file descriptor */
  55         struct drm_i915_file_private *file_priv;
  56
  57         /**
  58          * @ppgtt: unique address space (GTT)
  59          *
  60          * In full-ppgtt mode, each context has its own address space ensuring
  61          * complete seperation of one client from all others.
  62          *
  63          * In other modes, this is a NULL pointer with the expectation that
  64          * the caller uses the shared global GTT.
  65          */
  66         struct i915_hw_ppgtt *ppgtt;
  67
  68         /**
  69          * @pid: process id of creator
  70          *
  71          * Note that who created the context may not be the principle user,
  72          * as the context may be shared across a local socket. However,
  73          * that should only affect the default context, all contexts created
  74          * explicitly by the client are expected to be isolated.
  75          */
  76         struct pid *pid;
  77
  78         /**
  79          * @name: arbitrary name
  80          *
  81          * A name is constructed for the context from the creator's process
  82          * name, pid and user handle in order to uniquely identify the
  83          * context in messages.
  84          */
  85         const char *name;
  86
  87         /** link: place with &drm_i915_private.context_list */
  88         struct list_head link;
  89
  90         /**
  91          * @ref: reference count
  92          *
  93          * A reference to a context is held by both the client who created it
  94          * and on each request submitted to the hardware using the request
  95          * (to ensure the hardware has access to the state until it has
  96          * finished all pending writes). See i915_gem_context_get() and
  97          * i915_gem_context_put() for access.
  98          */
  99         struct kref ref;
 100
 101         /**
 102          * @flags: small set of booleans
 103          */
 104         unsigned long flags;
 105 #define CONTEXT_NO_ZEROMAP              BIT(0)
 106 #define CONTEXT_NO_ERROR_CAPTURE        1
 107 #define CONTEXT_CLOSED                  2
 108 #define CONTEXT_BANNABLE                3
 109 #define CONTEXT_BANNED                  4
 110 #define CONTEXT_FORCE_SINGLE_SUBMISSION 5
 111
 112         /**
 113          * @hw_id: - unique identifier for the context
 114          *
 115          * The hardware needs to uniquely identify the context for a few
 116          * functions like fault reporting, PASID, scheduling. The
 117          * &drm_i915_private.context_hw_ida is used to assign a unqiue
 118          * id for the lifetime of the context.
 119          */
 120         unsigned int hw_id;
 121
 122         /**
 123          * @user_handle: userspace identifier
 124          *
 125          * A unique per-file identifier is generated from
 126          * &drm_i915_file_private.contexts.
 127          */
 128         u32 user_handle;
 129
 130         /**
 131          * @priority: execution and service priority
 132          *
 133          * All clients are equal, but some are more equal than others!
 134          *
 135          * Requests from a context with a greater (more positive) value of
 136          * @priority will be executed before those with a lower @priority
 137          * value, forming a simple QoS.
 138          *
 139          * The &drm_i915_private.kernel_context is assigned the lowest priority.
 140          */
 141         int priority;
 142
 143         /** ggtt_alignment: alignment restriction for context objects */
 144         u32 ggtt_alignment;
 145         /** ggtt_offset_bias: placement restriction for context objects */
 146         u32 ggtt_offset_bias;
 147
 148         /** engine: per-engine logical HW state */
 149         struct intel_context {
 150                 struct i915_vma *state;
 151                 struct intel_ring *ring;
 152                 u32 *lrc_reg_state;
 153                 u64 lrc_desc;
 154                 int pin_count;
 155                 bool initialised;
 156         } engine[I915_NUM_ENGINES];
 157
 158         /** ring_size: size for allocating the per-engine ring buffer */
 159         u32 ring_size;
 160         /** desc_template: invariant fields for the HW context descriptor */
 161         u32 desc_template;
 162
 163         /** status_notifier: list of callbacks for context-switch changes */
 164         struct atomic_notifier_head status_notifier;
 165
 166         /** guilty_count: How many times this context has caused a GPU hang. */
 167         unsigned int guilty_count;
 168         /**
 169          * @active_count: How many times this context was active during a GPU
 170          * hang, but did not cause it.
 171          */
 172         unsigned int active_count;
 173
 174 #define CONTEXT_SCORE_GUILTY            10
 175 #define CONTEXT_SCORE_BAN_THRESHOLD     40
 176         /** ban_score: Accumulated score of all hangs caused by this context. */
 177         int ban_score;
 178
 179         /** remap_slice: Bitmask of cache lines that need remapping */
 180         u8 remap_slice;
 181 };
 182
 183 static inline bool i915_gem_context_is_closed(const struct i915_gem_context *ctx)
 184 {
 185         return test_bit(CONTEXT_CLOSED, &ctx->flags);
 186 }
 187
 188 static inline void i915_gem_context_set_closed(struct i915_gem_context *ctx)
 189 {
 190         GEM_BUG_ON(i915_gem_context_is_closed(ctx));
 191         __set_bit(CONTEXT_CLOSED, &ctx->flags);
 192 }
 193
 194 static inline bool i915_gem_context_no_error_capture(const struct i915_gem_context *ctx)
 195 {
 196         return test_bit(CONTEXT_NO_ERROR_CAPTURE, &ctx->flags);
 197 }
 198
 199 static inline void i915_gem_context_set_no_error_capture(struct i915_gem_context *ctx)
 200 {
 201         __set_bit(CONTEXT_NO_ERROR_CAPTURE, &ctx->flags);
 202 }
 203
 204 static inline void i915_gem_context_clear_no_error_capture(struct i915_gem_context *ctx)
 205 {
 206         __clear_bit(CONTEXT_NO_ERROR_CAPTURE, &ctx->flags);
 207 }
 208
 209 static inline bool i915_gem_context_is_bannable(const struct i915_gem_context *ctx)
 210 {
 211         return test_bit(CONTEXT_BANNABLE, &ctx->flags);
 212 }
 213
 214 static inline void i915_gem_context_set_bannable(struct i915_gem_context *ctx)
 215 {
 216         __set_bit(CONTEXT_BANNABLE, &ctx->flags);
 217 }
 218
 219 static inline void i915_gem_context_clear_bannable(struct i915_gem_context *ctx)
 220 {
 221         __clear_bit(CONTEXT_BANNABLE, &ctx->flags);
 222 }
 223
 224 static inline bool i915_gem_context_is_banned(const struct i915_gem_context *ctx)
 225 {
 226         return test_bit(CONTEXT_BANNED, &ctx->flags);
 227 }
 228
 229 static inline void i915_gem_context_set_banned(struct i915_gem_context *ctx)
 230 {
 231         __set_bit(CONTEXT_BANNED, &ctx->flags);
 232 }
 233
 234 static inline bool i915_gem_context_force_single_submission(const struct i915_gem_context *ctx)
 235 {
 236         return test_bit(CONTEXT_FORCE_SINGLE_SUBMISSION, &ctx->flags);
 237 }
 238
 239 static inline void i915_gem_context_set_force_single_submission(struct i915_gem_context *ctx)
 240 {
 241         __set_bit(CONTEXT_FORCE_SINGLE_SUBMISSION, &ctx->flags);
 242 }
 243
 244 static inline bool i915_gem_context_is_default(const struct i915_gem_context *c)
 245 {
 246         return c->user_handle == DEFAULT_CONTEXT_HANDLE;
 247 }
 248
 249 static inline bool i915_gem_context_is_kernel(struct i915_gem_context *ctx)
 250 {
 251         return !ctx->file_priv;
 252 }
 253
 254 /* i915_gem_context.c */
 255 int __must_check i915_gem_context_init(struct drm_i915_private *dev_priv);
 256 void i915_gem_context_lost(struct drm_i915_private *dev_priv);
 257 void i915_gem_context_fini(struct drm_i915_private *dev_priv);
 258 int i915_gem_context_open(struct drm_device *dev, struct drm_file *file);
 259 void i915_gem_context_close(struct drm_device *dev, struct drm_file *file);
 260 int i915_switch_context(struct drm_i915_gem_request *req);
 261 int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv);
 262 void i915_gem_context_free(struct kref *ctx_ref);
 263 struct i915_gem_context *
 264 i915_gem_context_create_gvt(struct drm_device *dev);
 265
 266 int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
 267                                   struct drm_file *file);
 268 int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
 269                                    struct drm_file *file);
 270 int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
 271                                     struct drm_file *file_priv);
 272 int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
 273                                     struct drm_file *file_priv);
 274 int i915_gem_context_reset_stats_ioctl(struct drm_device *dev, void *data,
 275                                        struct drm_file *file);
 276
 277 #endif /* !__I915_GEM_CONTEXT_H__ */