Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2011-2012 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 | * Authors: |
| 24 | * Ben Widawsky <ben@bwidawsk.net> |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | /* |
| 29 | * This file implements HW context support. On gen5+ a HW context consists of an |
| 30 | * opaque GPU object which is referenced at times of context saves and restores. |
| 31 | * With RC6 enabled, the context is also referenced as the GPU enters and exists |
| 32 | * from RC6 (GPU has it's own internal power context, except on gen5). Though |
| 33 | * something like a context does exist for the media ring, the code only |
| 34 | * supports contexts for the render ring. |
| 35 | * |
| 36 | * In software, there is a distinction between contexts created by the user, |
| 37 | * and the default HW context. The default HW context is used by GPU clients |
| 38 | * that do not request setup of their own hardware context. The default |
| 39 | * context's state is never restored to help prevent programming errors. This |
| 40 | * would happen if a client ran and piggy-backed off another clients GPU state. |
| 41 | * The default context only exists to give the GPU some offset to load as the |
| 42 | * current to invoke a save of the context we actually care about. In fact, the |
| 43 | * code could likely be constructed, albeit in a more complicated fashion, to |
| 44 | * never use the default context, though that limits the driver's ability to |
| 45 | * swap out, and/or destroy other contexts. |
| 46 | * |
| 47 | * All other contexts are created as a request by the GPU client. These contexts |
| 48 | * store GPU state, and thus allow GPU clients to not re-emit state (and |
| 49 | * potentially query certain state) at any time. The kernel driver makes |
| 50 | * certain that the appropriate commands are inserted. |
| 51 | * |
| 52 | * The context life cycle is semi-complicated in that context BOs may live |
| 53 | * longer than the context itself because of the way the hardware, and object |
| 54 | * tracking works. Below is a very crude representation of the state machine |
| 55 | * describing the context life. |
| 56 | * refcount pincount active |
| 57 | * S0: initial state 0 0 0 |
| 58 | * S1: context created 1 0 0 |
| 59 | * S2: context is currently running 2 1 X |
| 60 | * S3: GPU referenced, but not current 2 0 1 |
| 61 | * S4: context is current, but destroyed 1 1 0 |
| 62 | * S5: like S3, but destroyed 1 0 1 |
| 63 | * |
| 64 | * The most common (but not all) transitions: |
| 65 | * S0->S1: client creates a context |
| 66 | * S1->S2: client submits execbuf with context |
| 67 | * S2->S3: other clients submits execbuf with context |
| 68 | * S3->S1: context object was retired |
| 69 | * S3->S2: clients submits another execbuf |
| 70 | * S2->S4: context destroy called with current context |
| 71 | * S3->S5->S0: destroy path |
| 72 | * S4->S5->S0: destroy path on current context |
| 73 | * |
| 74 | * There are two confusing terms used above: |
| 75 | * The "current context" means the context which is currently running on the |
Damien Lespiau | 508842a | 2013-08-30 14:40:26 +0100 | [diff] [blame^] | 76 | * GPU. The GPU has loaded its state already and has stored away the gtt |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 77 | * offset of the BO. The GPU is not actively referencing the data at this |
| 78 | * offset, but it will on the next context switch. The only way to avoid this |
| 79 | * is to do a GPU reset. |
| 80 | * |
| 81 | * An "active context' is one which was previously the "current context" and is |
| 82 | * on the active list waiting for the next context switch to occur. Until this |
| 83 | * happens, the object must remain at the same gtt offset. It is therefore |
| 84 | * possible to destroy a context, but it is still active. |
| 85 | * |
| 86 | */ |
| 87 | |
David Howells | 760285e | 2012-10-02 18:01:07 +0100 | [diff] [blame] | 88 | #include <drm/drmP.h> |
| 89 | #include <drm/i915_drm.h> |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 90 | #include "i915_drv.h" |
| 91 | |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 92 | /* This is a HW constraint. The value below is the largest known requirement |
| 93 | * I've seen in a spec to date, and that was a workaround for a non-shipping |
| 94 | * part. It should be safe to decrease this, but it's more future proof as is. |
| 95 | */ |
| 96 | #define CONTEXT_ALIGN (64<<10) |
| 97 | |
| 98 | static struct i915_hw_context * |
| 99 | i915_gem_context_get(struct drm_i915_file_private *file_priv, u32 id); |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 100 | static int do_switch(struct i915_hw_context *to); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 101 | |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 102 | static int get_context_size(struct drm_device *dev) |
| 103 | { |
| 104 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 105 | int ret; |
| 106 | u32 reg; |
| 107 | |
| 108 | switch (INTEL_INFO(dev)->gen) { |
| 109 | case 6: |
| 110 | reg = I915_READ(CXT_SIZE); |
| 111 | ret = GEN6_CXT_TOTAL_SIZE(reg) * 64; |
| 112 | break; |
| 113 | case 7: |
Ben Widawsky | 4f91dd6 | 2012-07-18 10:10:09 -0700 | [diff] [blame] | 114 | reg = I915_READ(GEN7_CXT_SIZE); |
Ben Widawsky | 2e4291e | 2012-07-24 20:47:30 -0700 | [diff] [blame] | 115 | if (IS_HASWELL(dev)) |
Ben Widawsky | a0de80a | 2013-06-25 21:53:40 -0700 | [diff] [blame] | 116 | ret = HSW_CXT_TOTAL_SIZE; |
Ben Widawsky | 2e4291e | 2012-07-24 20:47:30 -0700 | [diff] [blame] | 117 | else |
| 118 | ret = GEN7_CXT_TOTAL_SIZE(reg) * 64; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 119 | break; |
| 120 | default: |
| 121 | BUG(); |
| 122 | } |
| 123 | |
| 124 | return ret; |
| 125 | } |
| 126 | |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 127 | void i915_gem_context_free(struct kref *ctx_ref) |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 128 | { |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 129 | struct i915_hw_context *ctx = container_of(ctx_ref, |
| 130 | typeof(*ctx), ref); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 131 | |
| 132 | drm_gem_object_unreference(&ctx->obj->base); |
| 133 | kfree(ctx); |
| 134 | } |
| 135 | |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 136 | static struct i915_hw_context * |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 137 | create_hw_context(struct drm_device *dev, |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 138 | struct drm_i915_file_private *file_priv) |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 139 | { |
| 140 | struct drm_i915_private *dev_priv = dev->dev_private; |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 141 | struct i915_hw_context *ctx; |
Tejun Heo | c8c470a | 2013-02-27 17:04:10 -0800 | [diff] [blame] | 142 | int ret; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 143 | |
Ben Widawsky | f94982b | 2012-11-10 10:56:04 -0800 | [diff] [blame] | 144 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 145 | if (ctx == NULL) |
| 146 | return ERR_PTR(-ENOMEM); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 147 | |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 148 | kref_init(&ctx->ref); |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 149 | ctx->obj = i915_gem_alloc_object(dev, dev_priv->hw_context_size); |
| 150 | if (ctx->obj == NULL) { |
| 151 | kfree(ctx); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 152 | DRM_DEBUG_DRIVER("Context object allocated failed\n"); |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 153 | return ERR_PTR(-ENOMEM); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Chris Wilson | 4615d4c | 2013-04-08 14:28:40 +0100 | [diff] [blame] | 156 | if (INTEL_INFO(dev)->gen >= 7) { |
| 157 | ret = i915_gem_object_set_cache_level(ctx->obj, |
Chris Wilson | 350ec88 | 2013-08-06 13:17:02 +0100 | [diff] [blame] | 158 | I915_CACHE_L3_LLC); |
Ben Widawsky | bb03641 | 2013-05-25 12:26:38 -0700 | [diff] [blame] | 159 | /* Failure shouldn't ever happen this early */ |
| 160 | if (WARN_ON(ret)) |
Chris Wilson | 4615d4c | 2013-04-08 14:28:40 +0100 | [diff] [blame] | 161 | goto err_out; |
| 162 | } |
| 163 | |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 164 | /* The ring associated with the context object is handled by the normal |
| 165 | * object tracking code. We give an initial ring value simple to pass an |
| 166 | * assertion in the context switch code. |
| 167 | */ |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 168 | ctx->ring = &dev_priv->ring[RCS]; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 169 | |
| 170 | /* Default context will never have a file_priv */ |
| 171 | if (file_priv == NULL) |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 172 | return ctx; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 173 | |
Tejun Heo | c8c470a | 2013-02-27 17:04:10 -0800 | [diff] [blame] | 174 | ret = idr_alloc(&file_priv->context_idr, ctx, DEFAULT_CONTEXT_ID + 1, 0, |
| 175 | GFP_KERNEL); |
| 176 | if (ret < 0) |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 177 | goto err_out; |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 178 | |
| 179 | ctx->file_priv = file_priv; |
Tejun Heo | c8c470a | 2013-02-27 17:04:10 -0800 | [diff] [blame] | 180 | ctx->id = ret; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 181 | |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 182 | return ctx; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 183 | |
| 184 | err_out: |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 185 | i915_gem_context_unreference(ctx); |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 186 | return ERR_PTR(ret); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 187 | } |
| 188 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 189 | static inline bool is_default_context(struct i915_hw_context *ctx) |
| 190 | { |
| 191 | return (ctx == ctx->ring->default_context); |
| 192 | } |
| 193 | |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 194 | /** |
| 195 | * The default context needs to exist per ring that uses contexts. It stores the |
| 196 | * context state of the GPU for applications that don't utilize HW contexts, as |
| 197 | * well as an idle case. |
| 198 | */ |
| 199 | static int create_default_context(struct drm_i915_private *dev_priv) |
| 200 | { |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 201 | struct i915_hw_context *ctx; |
| 202 | int ret; |
| 203 | |
| 204 | BUG_ON(!mutex_is_locked(&dev_priv->dev->struct_mutex)); |
| 205 | |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 206 | ctx = create_hw_context(dev_priv->dev, NULL); |
| 207 | if (IS_ERR(ctx)) |
| 208 | return PTR_ERR(ctx); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 209 | |
| 210 | /* We may need to do things with the shrinker which require us to |
| 211 | * immediately switch back to the default context. This can cause a |
| 212 | * problem as pinning the default context also requires GTT space which |
| 213 | * may not be available. To avoid this we always pin the |
| 214 | * default context. |
| 215 | */ |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 216 | dev_priv->ring[RCS].default_context = ctx; |
Ben Widawsky | c37e220 | 2013-07-31 16:59:58 -0700 | [diff] [blame] | 217 | ret = i915_gem_obj_ggtt_pin(ctx->obj, CONTEXT_ALIGN, false, false); |
Ben Widawsky | bb03641 | 2013-05-25 12:26:38 -0700 | [diff] [blame] | 218 | if (ret) { |
| 219 | DRM_DEBUG_DRIVER("Couldn't pin %d\n", ret); |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 220 | goto err_destroy; |
Ben Widawsky | bb03641 | 2013-05-25 12:26:38 -0700 | [diff] [blame] | 221 | } |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 222 | |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 223 | ret = do_switch(ctx); |
Ben Widawsky | bb03641 | 2013-05-25 12:26:38 -0700 | [diff] [blame] | 224 | if (ret) { |
| 225 | DRM_DEBUG_DRIVER("Switch failed %d\n", ret); |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 226 | goto err_unpin; |
Ben Widawsky | bb03641 | 2013-05-25 12:26:38 -0700 | [diff] [blame] | 227 | } |
Ben Widawsky | dfabbcb | 2012-06-04 14:42:51 -0700 | [diff] [blame] | 228 | |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 229 | DRM_DEBUG_DRIVER("Default HW context loaded\n"); |
| 230 | return 0; |
| 231 | |
| 232 | err_unpin: |
| 233 | i915_gem_object_unpin(ctx->obj); |
| 234 | err_destroy: |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 235 | i915_gem_context_unreference(ctx); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 236 | return ret; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | void i915_gem_context_init(struct drm_device *dev) |
| 240 | { |
| 241 | struct drm_i915_private *dev_priv = dev->dev_private; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 242 | |
Ben Widawsky | e158c5a | 2012-06-17 09:37:24 -0700 | [diff] [blame] | 243 | if (!HAS_HW_CONTEXTS(dev)) { |
| 244 | dev_priv->hw_contexts_disabled = true; |
Ben Widawsky | bb03641 | 2013-05-25 12:26:38 -0700 | [diff] [blame] | 245 | DRM_DEBUG_DRIVER("Disabling HW Contexts; old hardware\n"); |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 246 | return; |
Ben Widawsky | e158c5a | 2012-06-17 09:37:24 -0700 | [diff] [blame] | 247 | } |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 248 | |
| 249 | /* If called from reset, or thaw... we've been here already */ |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 250 | if (dev_priv->hw_contexts_disabled || |
| 251 | dev_priv->ring[RCS].default_context) |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 252 | return; |
| 253 | |
Ben Widawsky | 07ea0d8 | 2013-02-07 13:34:19 -0800 | [diff] [blame] | 254 | dev_priv->hw_context_size = round_up(get_context_size(dev), 4096); |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 255 | |
Ben Widawsky | 07ea0d8 | 2013-02-07 13:34:19 -0800 | [diff] [blame] | 256 | if (dev_priv->hw_context_size > (1<<20)) { |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 257 | dev_priv->hw_contexts_disabled = true; |
Ben Widawsky | bb03641 | 2013-05-25 12:26:38 -0700 | [diff] [blame] | 258 | DRM_DEBUG_DRIVER("Disabling HW Contexts; invalid size\n"); |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 259 | return; |
| 260 | } |
| 261 | |
| 262 | if (create_default_context(dev_priv)) { |
| 263 | dev_priv->hw_contexts_disabled = true; |
Ben Widawsky | bb03641 | 2013-05-25 12:26:38 -0700 | [diff] [blame] | 264 | DRM_DEBUG_DRIVER("Disabling HW Contexts; create failed\n"); |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 265 | return; |
| 266 | } |
| 267 | |
| 268 | DRM_DEBUG_DRIVER("HW context support initialized\n"); |
| 269 | } |
| 270 | |
| 271 | void i915_gem_context_fini(struct drm_device *dev) |
| 272 | { |
| 273 | struct drm_i915_private *dev_priv = dev->dev_private; |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 274 | struct i915_hw_context *dctx = dev_priv->ring[RCS].default_context; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 275 | |
| 276 | if (dev_priv->hw_contexts_disabled) |
| 277 | return; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 278 | |
Daniel Vetter | 55a6662 | 2012-06-19 21:55:32 +0200 | [diff] [blame] | 279 | /* The only known way to stop the gpu from accessing the hw context is |
| 280 | * to reset it. Do this as the very last operation to avoid confusing |
| 281 | * other code, leading to spurious errors. */ |
| 282 | intel_gpu_reset(dev); |
| 283 | |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 284 | i915_gem_object_unpin(dctx->obj); |
Mika Kuoppala | 168f836 | 2013-05-03 16:29:08 +0300 | [diff] [blame] | 285 | |
| 286 | /* When default context is created and switched to, base object refcount |
| 287 | * will be 2 (+1 from object creation and +1 from do_switch()). |
| 288 | * i915_gem_context_fini() will be called after gpu_idle() has switched |
| 289 | * to default context. So we need to unreference the base object once |
| 290 | * to offset the do_switch part, so that i915_gem_context_unreference() |
| 291 | * can then free the base object correctly. */ |
| 292 | drm_gem_object_unreference(&dctx->obj->base); |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 293 | i915_gem_context_unreference(dctx); |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 294 | } |
| 295 | |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 296 | static int context_idr_cleanup(int id, void *p, void *data) |
| 297 | { |
Daniel Vetter | 73c273e | 2012-06-19 20:27:39 +0200 | [diff] [blame] | 298 | struct i915_hw_context *ctx = p; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 299 | |
| 300 | BUG_ON(id == DEFAULT_CONTEXT_ID); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 301 | |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 302 | i915_gem_context_unreference(ctx); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 303 | return 0; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 304 | } |
| 305 | |
Mika Kuoppala | c0bb617 | 2013-06-12 12:35:29 +0300 | [diff] [blame] | 306 | struct i915_ctx_hang_stats * |
Chris Wilson | 11fa338 | 2013-07-03 17:22:06 +0300 | [diff] [blame] | 307 | i915_gem_context_get_hang_stats(struct drm_device *dev, |
Mika Kuoppala | c0bb617 | 2013-06-12 12:35:29 +0300 | [diff] [blame] | 308 | struct drm_file *file, |
| 309 | u32 id) |
| 310 | { |
Chris Wilson | 11fa338 | 2013-07-03 17:22:06 +0300 | [diff] [blame] | 311 | struct drm_i915_private *dev_priv = dev->dev_private; |
Mika Kuoppala | c0bb617 | 2013-06-12 12:35:29 +0300 | [diff] [blame] | 312 | struct drm_i915_file_private *file_priv = file->driver_priv; |
Chris Wilson | 11fa338 | 2013-07-03 17:22:06 +0300 | [diff] [blame] | 313 | struct i915_hw_context *ctx; |
Mika Kuoppala | c0bb617 | 2013-06-12 12:35:29 +0300 | [diff] [blame] | 314 | |
| 315 | if (id == DEFAULT_CONTEXT_ID) |
| 316 | return &file_priv->hang_stats; |
| 317 | |
Chris Wilson | 11fa338 | 2013-07-03 17:22:06 +0300 | [diff] [blame] | 318 | ctx = NULL; |
| 319 | if (!dev_priv->hw_contexts_disabled) |
| 320 | ctx = i915_gem_context_get(file->driver_priv, id); |
| 321 | if (ctx == NULL) |
Mika Kuoppala | c0bb617 | 2013-06-12 12:35:29 +0300 | [diff] [blame] | 322 | return ERR_PTR(-ENOENT); |
| 323 | |
Chris Wilson | 11fa338 | 2013-07-03 17:22:06 +0300 | [diff] [blame] | 324 | return &ctx->hang_stats; |
Mika Kuoppala | c0bb617 | 2013-06-12 12:35:29 +0300 | [diff] [blame] | 325 | } |
| 326 | |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 327 | void i915_gem_context_close(struct drm_device *dev, struct drm_file *file) |
| 328 | { |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 329 | struct drm_i915_file_private *file_priv = file->driver_priv; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 330 | |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 331 | mutex_lock(&dev->struct_mutex); |
Daniel Vetter | 73c273e | 2012-06-19 20:27:39 +0200 | [diff] [blame] | 332 | idr_for_each(&file_priv->context_idr, context_idr_cleanup, NULL); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 333 | idr_destroy(&file_priv->context_idr); |
| 334 | mutex_unlock(&dev->struct_mutex); |
| 335 | } |
| 336 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 337 | static struct i915_hw_context * |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 338 | i915_gem_context_get(struct drm_i915_file_private *file_priv, u32 id) |
| 339 | { |
| 340 | return (struct i915_hw_context *)idr_find(&file_priv->context_idr, id); |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 341 | } |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 342 | |
| 343 | static inline int |
| 344 | mi_set_context(struct intel_ring_buffer *ring, |
| 345 | struct i915_hw_context *new_context, |
| 346 | u32 hw_flags) |
| 347 | { |
| 348 | int ret; |
| 349 | |
Ben Widawsky | 12b0286 | 2012-06-04 14:42:50 -0700 | [diff] [blame] | 350 | /* w/a: If Flush TLB Invalidation Mode is enabled, driver must do a TLB |
| 351 | * invalidation prior to MI_SET_CONTEXT. On GEN6 we don't set the value |
| 352 | * explicitly, so we rely on the value at ring init, stored in |
| 353 | * itlb_before_ctx_switch. |
| 354 | */ |
| 355 | if (IS_GEN6(ring->dev) && ring->itlb_before_ctx_switch) { |
Chris Wilson | ac82ea2 | 2012-10-01 14:27:04 +0100 | [diff] [blame] | 356 | ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, 0); |
Ben Widawsky | 12b0286 | 2012-06-04 14:42:50 -0700 | [diff] [blame] | 357 | if (ret) |
| 358 | return ret; |
| 359 | } |
| 360 | |
Ben Widawsky | e37ec39 | 2012-06-04 14:42:48 -0700 | [diff] [blame] | 361 | ret = intel_ring_begin(ring, 6); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 362 | if (ret) |
| 363 | return ret; |
| 364 | |
Damien Lespiau | 8693a82 | 2013-05-03 18:48:11 +0100 | [diff] [blame] | 365 | /* WaProgramMiArbOnOffAroundMiSetContext:ivb,vlv,hsw */ |
Ben Widawsky | e37ec39 | 2012-06-04 14:42:48 -0700 | [diff] [blame] | 366 | if (IS_GEN7(ring->dev)) |
| 367 | intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_DISABLE); |
| 368 | else |
| 369 | intel_ring_emit(ring, MI_NOOP); |
| 370 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 371 | intel_ring_emit(ring, MI_NOOP); |
| 372 | intel_ring_emit(ring, MI_SET_CONTEXT); |
Ben Widawsky | f343c5f | 2013-07-05 14:41:04 -0700 | [diff] [blame] | 373 | intel_ring_emit(ring, i915_gem_obj_ggtt_offset(new_context->obj) | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 374 | MI_MM_SPACE_GTT | |
| 375 | MI_SAVE_EXT_STATE_EN | |
| 376 | MI_RESTORE_EXT_STATE_EN | |
| 377 | hw_flags); |
| 378 | /* w/a: MI_SET_CONTEXT must always be followed by MI_NOOP */ |
| 379 | intel_ring_emit(ring, MI_NOOP); |
| 380 | |
Ben Widawsky | e37ec39 | 2012-06-04 14:42:48 -0700 | [diff] [blame] | 381 | if (IS_GEN7(ring->dev)) |
| 382 | intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_ENABLE); |
| 383 | else |
| 384 | intel_ring_emit(ring, MI_NOOP); |
| 385 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 386 | intel_ring_advance(ring); |
| 387 | |
| 388 | return ret; |
| 389 | } |
| 390 | |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 391 | static int do_switch(struct i915_hw_context *to) |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 392 | { |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 393 | struct intel_ring_buffer *ring = to->ring; |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 394 | struct i915_hw_context *from = ring->last_context; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 395 | u32 hw_flags = 0; |
| 396 | int ret; |
| 397 | |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 398 | BUG_ON(from != NULL && from->obj != NULL && from->obj->pin_count == 0); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 399 | |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 400 | if (from == to) |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 401 | return 0; |
| 402 | |
Ben Widawsky | c37e220 | 2013-07-31 16:59:58 -0700 | [diff] [blame] | 403 | ret = i915_gem_obj_ggtt_pin(to->obj, CONTEXT_ALIGN, false, false); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 404 | if (ret) |
| 405 | return ret; |
| 406 | |
Chris Wilson | d3373a2 | 2012-07-15 12:34:22 +0100 | [diff] [blame] | 407 | /* Clear this page out of any CPU caches for coherent swap-in/out. Note |
| 408 | * that thanks to write = false in this call and us not setting any gpu |
| 409 | * write domains when putting a context object onto the active list |
| 410 | * (when switching away from it), this won't block. |
| 411 | * XXX: We need a real interface to do this instead of trickery. */ |
| 412 | ret = i915_gem_object_set_to_gtt_domain(to->obj, false); |
| 413 | if (ret) { |
| 414 | i915_gem_object_unpin(to->obj); |
| 415 | return ret; |
| 416 | } |
| 417 | |
Daniel Vetter | 3af7b85 | 2012-06-14 00:08:32 +0200 | [diff] [blame] | 418 | if (!to->obj->has_global_gtt_mapping) |
| 419 | i915_gem_gtt_bind_object(to->obj, to->obj->cache_level); |
| 420 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 421 | if (!to->is_initialized || is_default_context(to)) |
| 422 | hw_flags |= MI_RESTORE_INHIBIT; |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 423 | else if (WARN_ON_ONCE(from == to)) /* not yet expected */ |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 424 | hw_flags |= MI_FORCE_RESTORE; |
| 425 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 426 | ret = mi_set_context(ring, to, hw_flags); |
| 427 | if (ret) { |
| 428 | i915_gem_object_unpin(to->obj); |
| 429 | return ret; |
| 430 | } |
| 431 | |
| 432 | /* The backing object for the context is done after switching to the |
| 433 | * *next* context. Therefore we cannot retire the previous context until |
| 434 | * the next context has already started running. In fact, the below code |
| 435 | * is a bit suboptimal because the retiring can occur simply after the |
| 436 | * MI_SET_CONTEXT instead of when the next seqno has completed. |
| 437 | */ |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 438 | if (from != NULL) { |
Ben Widawsky | ca191b1 | 2013-07-31 17:00:14 -0700 | [diff] [blame] | 439 | struct drm_i915_private *dev_priv = from->obj->base.dev->dev_private; |
| 440 | struct i915_address_space *ggtt = &dev_priv->gtt.base; |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 441 | from->obj->base.read_domains = I915_GEM_DOMAIN_INSTRUCTION; |
Ben Widawsky | ca191b1 | 2013-07-31 17:00:14 -0700 | [diff] [blame] | 442 | list_move_tail(&i915_gem_obj_to_vma(from->obj, ggtt)->mm_list, &ggtt->active_list); |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 443 | i915_gem_object_move_to_active(from->obj, ring); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 444 | /* As long as MI_SET_CONTEXT is serializing, ie. it flushes the |
| 445 | * whole damn pipeline, we don't need to explicitly mark the |
| 446 | * object dirty. The only exception is that the context must be |
| 447 | * correct in case the object gets swapped out. Ideally we'd be |
| 448 | * able to defer doing this until we know the object would be |
| 449 | * swapped, but there is no way to do that yet. |
| 450 | */ |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 451 | from->obj->dirty = 1; |
| 452 | BUG_ON(from->obj->ring != ring); |
Chris Wilson | b259b31 | 2012-07-15 12:34:23 +0100 | [diff] [blame] | 453 | |
Chris Wilson | c0321e2 | 2013-08-26 19:50:53 -0300 | [diff] [blame] | 454 | /* obj is kept alive until the next request by its active ref */ |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 455 | i915_gem_object_unpin(from->obj); |
| 456 | i915_gem_context_unreference(from); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 457 | } |
| 458 | |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 459 | i915_gem_context_reference(to); |
| 460 | ring->last_context = to; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 461 | to->is_initialized = true; |
| 462 | |
| 463 | return 0; |
| 464 | } |
| 465 | |
| 466 | /** |
| 467 | * i915_switch_context() - perform a GPU context switch. |
| 468 | * @ring: ring for which we'll execute the context switch |
| 469 | * @file_priv: file_priv associated with the context, may be NULL |
| 470 | * @id: context id number |
| 471 | * @seqno: sequence number by which the new context will be switched to |
| 472 | * @flags: |
| 473 | * |
| 474 | * The context life cycle is simple. The context refcount is incremented and |
| 475 | * decremented by 1 and create and destroy. If the context is in use by the GPU, |
| 476 | * it will have a refoucnt > 1. This allows us to destroy the context abstract |
| 477 | * object while letting the normal object tracking destroy the backing BO. |
| 478 | */ |
| 479 | int i915_switch_context(struct intel_ring_buffer *ring, |
| 480 | struct drm_file *file, |
| 481 | int to_id) |
| 482 | { |
| 483 | struct drm_i915_private *dev_priv = ring->dev->dev_private; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 484 | struct i915_hw_context *to; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 485 | |
| 486 | if (dev_priv->hw_contexts_disabled) |
| 487 | return 0; |
| 488 | |
Ben Widawsky | 186507e | 2013-04-23 23:15:29 -0700 | [diff] [blame] | 489 | WARN_ON(!mutex_is_locked(&dev_priv->dev->struct_mutex)); |
| 490 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 491 | if (ring != &dev_priv->ring[RCS]) |
| 492 | return 0; |
| 493 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 494 | if (to_id == DEFAULT_CONTEXT_ID) { |
| 495 | to = ring->default_context; |
| 496 | } else { |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 497 | if (file == NULL) |
| 498 | return -EINVAL; |
| 499 | |
| 500 | to = i915_gem_context_get(file->driver_priv, to_id); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 501 | if (to == NULL) |
Daniel Vetter | 0d32601 | 2012-06-19 16:52:31 +0200 | [diff] [blame] | 502 | return -ENOENT; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 503 | } |
| 504 | |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 505 | return do_switch(to); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 506 | } |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 507 | |
| 508 | int i915_gem_context_create_ioctl(struct drm_device *dev, void *data, |
| 509 | struct drm_file *file) |
| 510 | { |
Daniel Vetter | 5fa8be6 | 2012-06-19 17:16:01 +0200 | [diff] [blame] | 511 | struct drm_i915_private *dev_priv = dev->dev_private; |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 512 | struct drm_i915_gem_context_create *args = data; |
| 513 | struct drm_i915_file_private *file_priv = file->driver_priv; |
| 514 | struct i915_hw_context *ctx; |
| 515 | int ret; |
| 516 | |
| 517 | if (!(dev->driver->driver_features & DRIVER_GEM)) |
| 518 | return -ENODEV; |
| 519 | |
Daniel Vetter | 5fa8be6 | 2012-06-19 17:16:01 +0200 | [diff] [blame] | 520 | if (dev_priv->hw_contexts_disabled) |
| 521 | return -ENODEV; |
| 522 | |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 523 | ret = i915_mutex_lock_interruptible(dev); |
| 524 | if (ret) |
| 525 | return ret; |
| 526 | |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 527 | ctx = create_hw_context(dev, file_priv); |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 528 | mutex_unlock(&dev->struct_mutex); |
Dan Carpenter | be63638 | 2012-07-17 09:44:49 +0300 | [diff] [blame] | 529 | if (IS_ERR(ctx)) |
| 530 | return PTR_ERR(ctx); |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 531 | |
| 532 | args->ctx_id = ctx->id; |
| 533 | DRM_DEBUG_DRIVER("HW context %d created\n", args->ctx_id); |
| 534 | |
Dan Carpenter | be63638 | 2012-07-17 09:44:49 +0300 | [diff] [blame] | 535 | return 0; |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 536 | } |
| 537 | |
| 538 | int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data, |
| 539 | struct drm_file *file) |
| 540 | { |
| 541 | struct drm_i915_gem_context_destroy *args = data; |
| 542 | struct drm_i915_file_private *file_priv = file->driver_priv; |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 543 | struct i915_hw_context *ctx; |
| 544 | int ret; |
| 545 | |
| 546 | if (!(dev->driver->driver_features & DRIVER_GEM)) |
| 547 | return -ENODEV; |
| 548 | |
| 549 | ret = i915_mutex_lock_interruptible(dev); |
| 550 | if (ret) |
| 551 | return ret; |
| 552 | |
| 553 | ctx = i915_gem_context_get(file_priv, args->ctx_id); |
| 554 | if (!ctx) { |
| 555 | mutex_unlock(&dev->struct_mutex); |
Daniel Vetter | 0d32601 | 2012-06-19 16:52:31 +0200 | [diff] [blame] | 556 | return -ENOENT; |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 557 | } |
| 558 | |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 559 | idr_remove(&ctx->file_priv->context_idr, ctx->id); |
| 560 | i915_gem_context_unreference(ctx); |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 561 | mutex_unlock(&dev->struct_mutex); |
| 562 | |
| 563 | DRM_DEBUG_DRIVER("HW context %d destroyed\n", args->ctx_id); |
| 564 | return 0; |
| 565 | } |