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 | */ |
Ben Widawsky | b731d33 | 2013-12-06 14:10:59 -0800 | [diff] [blame] | 96 | #define GEN6_CONTEXT_ALIGN (64<<10) |
| 97 | #define GEN7_CONTEXT_ALIGN 4096 |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 98 | |
Ben Widawsky | 67e3d297 | 2013-12-06 14:11:01 -0800 | [diff] [blame] | 99 | static int do_switch(struct intel_ring_buffer *ring, |
| 100 | struct i915_hw_context *to); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 101 | |
Ben Widawsky | b731d33 | 2013-12-06 14:10:59 -0800 | [diff] [blame] | 102 | static size_t get_context_alignment(struct drm_device *dev) |
| 103 | { |
| 104 | if (IS_GEN6(dev)) |
| 105 | return GEN6_CONTEXT_ALIGN; |
| 106 | |
| 107 | return GEN7_CONTEXT_ALIGN; |
| 108 | } |
| 109 | |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 110 | static int get_context_size(struct drm_device *dev) |
| 111 | { |
| 112 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 113 | int ret; |
| 114 | u32 reg; |
| 115 | |
| 116 | switch (INTEL_INFO(dev)->gen) { |
| 117 | case 6: |
| 118 | reg = I915_READ(CXT_SIZE); |
| 119 | ret = GEN6_CXT_TOTAL_SIZE(reg) * 64; |
| 120 | break; |
| 121 | case 7: |
Ben Widawsky | 4f91dd6 | 2012-07-18 10:10:09 -0700 | [diff] [blame] | 122 | reg = I915_READ(GEN7_CXT_SIZE); |
Ben Widawsky | 2e4291e | 2012-07-24 20:47:30 -0700 | [diff] [blame] | 123 | if (IS_HASWELL(dev)) |
Ben Widawsky | a0de80a | 2013-06-25 21:53:40 -0700 | [diff] [blame] | 124 | ret = HSW_CXT_TOTAL_SIZE; |
Ben Widawsky | 2e4291e | 2012-07-24 20:47:30 -0700 | [diff] [blame] | 125 | else |
| 126 | ret = GEN7_CXT_TOTAL_SIZE(reg) * 64; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 127 | break; |
Ben Widawsky | 8897644 | 2013-11-02 21:07:05 -0700 | [diff] [blame] | 128 | case 8: |
| 129 | ret = GEN8_CXT_TOTAL_SIZE; |
| 130 | break; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 131 | default: |
| 132 | BUG(); |
| 133 | } |
| 134 | |
| 135 | return ret; |
| 136 | } |
| 137 | |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 138 | void i915_gem_context_free(struct kref *ctx_ref) |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 139 | { |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 140 | struct i915_hw_context *ctx = container_of(ctx_ref, |
| 141 | typeof(*ctx), ref); |
Ben Widawsky | c7c48df | 2013-12-06 14:11:15 -0800 | [diff] [blame] | 142 | struct i915_hw_ppgtt *ppgtt = NULL; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 143 | |
Ben Widawsky | c7c48df | 2013-12-06 14:11:15 -0800 | [diff] [blame] | 144 | /* We refcount even the aliasing PPGTT to keep the code symmetric */ |
| 145 | if (USES_ALIASING_PPGTT(ctx->obj->base.dev)) |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 146 | ppgtt = ctx_to_ppgtt(ctx); |
Ben Widawsky | c7c48df | 2013-12-06 14:11:15 -0800 | [diff] [blame] | 147 | |
| 148 | /* XXX: Free up the object before tearing down the address space, in |
| 149 | * case we're bound in the PPGTT */ |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 150 | drm_gem_object_unreference(&ctx->obj->base); |
Ben Widawsky | c7c48df | 2013-12-06 14:11:15 -0800 | [diff] [blame] | 151 | |
| 152 | if (ppgtt) |
| 153 | kref_put(&ppgtt->ref, ppgtt_release); |
| 154 | list_del(&ctx->link); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 155 | kfree(ctx); |
| 156 | } |
| 157 | |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 158 | static struct i915_hw_ppgtt * |
| 159 | create_vm_for_ctx(struct drm_device *dev, struct i915_hw_context *ctx) |
| 160 | { |
| 161 | struct i915_hw_ppgtt *ppgtt; |
| 162 | int ret; |
| 163 | |
| 164 | ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL); |
| 165 | if (!ppgtt) |
| 166 | return ERR_PTR(-ENOMEM); |
| 167 | |
| 168 | ret = i915_gem_init_ppgtt(dev, ppgtt); |
| 169 | if (ret) { |
| 170 | kfree(ppgtt); |
| 171 | return ERR_PTR(ret); |
| 172 | } |
| 173 | |
| 174 | return ppgtt; |
| 175 | } |
| 176 | |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 177 | static struct i915_hw_context * |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 178 | __create_hw_context(struct drm_device *dev, |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 179 | struct drm_i915_file_private *file_priv) |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 180 | { |
| 181 | struct drm_i915_private *dev_priv = dev->dev_private; |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 182 | struct i915_hw_context *ctx; |
Tejun Heo | c8c470a | 2013-02-27 17:04:10 -0800 | [diff] [blame] | 183 | int ret; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 184 | |
Ben Widawsky | f94982b | 2012-11-10 10:56:04 -0800 | [diff] [blame] | 185 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 186 | if (ctx == NULL) |
| 187 | return ERR_PTR(-ENOMEM); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 188 | |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 189 | kref_init(&ctx->ref); |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 190 | ctx->obj = i915_gem_alloc_object(dev, dev_priv->hw_context_size); |
Ben Widawsky | a33afea | 2013-09-17 21:12:45 -0700 | [diff] [blame] | 191 | INIT_LIST_HEAD(&ctx->link); |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 192 | if (ctx->obj == NULL) { |
| 193 | kfree(ctx); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 194 | DRM_DEBUG_DRIVER("Context object allocated failed\n"); |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 195 | return ERR_PTR(-ENOMEM); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 196 | } |
| 197 | |
Chris Wilson | 4615d4c | 2013-04-08 14:28:40 +0100 | [diff] [blame] | 198 | if (INTEL_INFO(dev)->gen >= 7) { |
| 199 | ret = i915_gem_object_set_cache_level(ctx->obj, |
Chris Wilson | 350ec88 | 2013-08-06 13:17:02 +0100 | [diff] [blame] | 200 | I915_CACHE_L3_LLC); |
Ben Widawsky | bb03641 | 2013-05-25 12:26:38 -0700 | [diff] [blame] | 201 | /* Failure shouldn't ever happen this early */ |
| 202 | if (WARN_ON(ret)) |
Chris Wilson | 4615d4c | 2013-04-08 14:28:40 +0100 | [diff] [blame] | 203 | goto err_out; |
| 204 | } |
| 205 | |
Ben Widawsky | a33afea | 2013-09-17 21:12:45 -0700 | [diff] [blame] | 206 | list_add_tail(&ctx->link, &dev_priv->context_list); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 207 | |
| 208 | /* Default context will never have a file_priv */ |
| 209 | if (file_priv == NULL) |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 210 | return ctx; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 211 | |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 212 | ret = idr_alloc(&file_priv->context_idr, ctx, DEFAULT_CONTEXT_ID, 0, |
Tejun Heo | c8c470a | 2013-02-27 17:04:10 -0800 | [diff] [blame] | 213 | GFP_KERNEL); |
| 214 | if (ret < 0) |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 215 | goto err_out; |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 216 | |
| 217 | ctx->file_priv = file_priv; |
Tejun Heo | c8c470a | 2013-02-27 17:04:10 -0800 | [diff] [blame] | 218 | ctx->id = ret; |
Ben Widawsky | 3ccfd19 | 2013-09-18 19:03:18 -0700 | [diff] [blame] | 219 | /* NB: Mark all slices as needing a remap so that when the context first |
| 220 | * loads it will restore whatever remap state already exists. If there |
| 221 | * is no remap info, it will be a NOP. */ |
| 222 | ctx->remap_slice = (1 << NUM_L3_SLICES(dev)) - 1; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 223 | |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 224 | return ctx; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 225 | |
| 226 | err_out: |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 227 | i915_gem_context_unreference(ctx); |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 228 | return ERR_PTR(ret); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 231 | static inline bool is_default_context(struct i915_hw_context *ctx) |
| 232 | { |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 233 | return (ctx->id == DEFAULT_CONTEXT_ID); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 234 | } |
| 235 | |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 236 | /** |
| 237 | * The default context needs to exist per ring that uses contexts. It stores the |
| 238 | * context state of the GPU for applications that don't utilize HW contexts, as |
| 239 | * well as an idle case. |
| 240 | */ |
Ben Widawsky | a45d0f6 | 2013-12-06 14:11:05 -0800 | [diff] [blame] | 241 | static struct i915_hw_context * |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 242 | i915_gem_create_context(struct drm_device *dev, |
| 243 | struct drm_i915_file_private *file_priv, |
| 244 | bool create_vm) |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 245 | { |
Chris Wilson | 42c3b60 | 2014-01-23 19:40:02 +0000 | [diff] [blame^] | 246 | const bool is_global_default_ctx = file_priv == NULL; |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 247 | struct drm_i915_private *dev_priv = dev->dev_private; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 248 | struct i915_hw_context *ctx; |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 249 | int ret = 0; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 250 | |
Ben Widawsky | b731d33 | 2013-12-06 14:10:59 -0800 | [diff] [blame] | 251 | BUG_ON(!mutex_is_locked(&dev->struct_mutex)); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 252 | |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 253 | ctx = __create_hw_context(dev, file_priv); |
Ben Widawsky | 146937e | 2012-06-29 10:30:39 -0700 | [diff] [blame] | 254 | if (IS_ERR(ctx)) |
Ben Widawsky | a45d0f6 | 2013-12-06 14:11:05 -0800 | [diff] [blame] | 255 | return ctx; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 256 | |
Chris Wilson | 42c3b60 | 2014-01-23 19:40:02 +0000 | [diff] [blame^] | 257 | if (is_global_default_ctx) { |
| 258 | /* We may need to do things with the shrinker which |
| 259 | * require us to immediately switch back to the default |
| 260 | * context. This can cause a problem as pinning the |
| 261 | * default context also requires GTT space which may not |
| 262 | * be available. To avoid this we always pin the default |
| 263 | * context. |
| 264 | */ |
| 265 | ret = i915_gem_obj_ggtt_pin(ctx->obj, |
| 266 | get_context_alignment(dev), |
| 267 | false, false); |
| 268 | if (ret) { |
| 269 | DRM_DEBUG_DRIVER("Couldn't pin %d\n", ret); |
| 270 | goto err_destroy; |
| 271 | } |
| 272 | } |
| 273 | |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 274 | if (create_vm) { |
| 275 | struct i915_hw_ppgtt *ppgtt = create_vm_for_ctx(dev, ctx); |
| 276 | |
| 277 | if (IS_ERR_OR_NULL(ppgtt)) { |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 278 | DRM_DEBUG_DRIVER("PPGTT setup failed (%ld)\n", |
| 279 | PTR_ERR(ppgtt)); |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 280 | ret = PTR_ERR(ppgtt); |
Chris Wilson | 42c3b60 | 2014-01-23 19:40:02 +0000 | [diff] [blame^] | 281 | goto err_unpin; |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 282 | } else |
| 283 | ctx->vm = &ppgtt->base; |
| 284 | |
| 285 | /* This case is reserved for the global default context and |
| 286 | * should only happen once. */ |
Chris Wilson | 42c3b60 | 2014-01-23 19:40:02 +0000 | [diff] [blame^] | 287 | if (is_global_default_ctx) { |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 288 | if (WARN_ON(dev_priv->mm.aliasing_ppgtt)) { |
| 289 | ret = -EEXIST; |
Chris Wilson | 42c3b60 | 2014-01-23 19:40:02 +0000 | [diff] [blame^] | 290 | goto err_unpin; |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 291 | } |
| 292 | |
| 293 | dev_priv->mm.aliasing_ppgtt = ppgtt; |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 294 | } |
| 295 | } else if (USES_ALIASING_PPGTT(dev)) { |
| 296 | /* For platforms which only have aliasing PPGTT, we fake the |
| 297 | * address space and refcounting. */ |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 298 | ctx->vm = &dev_priv->mm.aliasing_ppgtt->base; |
Ben Widawsky | 7e0d96b | 2013-12-06 14:11:26 -0800 | [diff] [blame] | 299 | kref_get(&dev_priv->mm.aliasing_ppgtt->ref); |
| 300 | } else |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 301 | ctx->vm = &dev_priv->gtt.base; |
| 302 | |
Ben Widawsky | a45d0f6 | 2013-12-06 14:11:05 -0800 | [diff] [blame] | 303 | return ctx; |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 304 | |
Chris Wilson | 42c3b60 | 2014-01-23 19:40:02 +0000 | [diff] [blame^] | 305 | err_unpin: |
| 306 | if (is_global_default_ctx) |
| 307 | i915_gem_object_ggtt_unpin(ctx->obj); |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 308 | err_destroy: |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 309 | i915_gem_context_unreference(ctx); |
Ben Widawsky | a45d0f6 | 2013-12-06 14:11:05 -0800 | [diff] [blame] | 310 | return ERR_PTR(ret); |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 311 | } |
| 312 | |
Ben Widawsky | acce9ff | 2013-12-06 14:11:03 -0800 | [diff] [blame] | 313 | void i915_gem_context_reset(struct drm_device *dev) |
| 314 | { |
| 315 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 316 | struct intel_ring_buffer *ring; |
| 317 | int i; |
| 318 | |
| 319 | if (!HAS_HW_CONTEXTS(dev)) |
| 320 | return; |
| 321 | |
| 322 | /* Prevent the hardware from restoring the last context (which hung) on |
| 323 | * the next switch */ |
| 324 | for (i = 0; i < I915_NUM_RINGS; i++) { |
| 325 | struct i915_hw_context *dctx; |
| 326 | if (!(INTEL_INFO(dev)->ring_mask & (1<<i))) |
| 327 | continue; |
| 328 | |
| 329 | /* Do a fake switch to the default context */ |
| 330 | ring = &dev_priv->ring[i]; |
| 331 | dctx = ring->default_context; |
| 332 | if (WARN_ON(!dctx)) |
| 333 | continue; |
| 334 | |
| 335 | if (!ring->last_context) |
| 336 | continue; |
| 337 | |
| 338 | if (ring->last_context == dctx) |
| 339 | continue; |
| 340 | |
| 341 | if (i == RCS) { |
| 342 | WARN_ON(i915_gem_obj_ggtt_pin(dctx->obj, |
| 343 | get_context_alignment(dev), |
| 344 | false, false)); |
| 345 | /* Fake a finish/inactive */ |
| 346 | dctx->obj->base.write_domain = 0; |
| 347 | dctx->obj->active = 0; |
| 348 | } |
| 349 | |
| 350 | i915_gem_context_unreference(ring->last_context); |
| 351 | i915_gem_context_reference(dctx); |
| 352 | ring->last_context = dctx; |
| 353 | } |
| 354 | } |
| 355 | |
Ben Widawsky | 8245be3 | 2013-11-06 13:56:29 -0200 | [diff] [blame] | 356 | int i915_gem_context_init(struct drm_device *dev) |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 357 | { |
| 358 | struct drm_i915_private *dev_priv = dev->dev_private; |
Ben Widawsky | 67e3d297 | 2013-12-06 14:11:01 -0800 | [diff] [blame] | 359 | struct intel_ring_buffer *ring; |
Ben Widawsky | a45d0f6 | 2013-12-06 14:11:05 -0800 | [diff] [blame] | 360 | int i; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 361 | |
Ben Widawsky | 8245be3 | 2013-11-06 13:56:29 -0200 | [diff] [blame] | 362 | if (!HAS_HW_CONTEXTS(dev)) |
| 363 | return 0; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 364 | |
Ben Widawsky | 2fa48d8 | 2013-12-06 14:11:04 -0800 | [diff] [blame] | 365 | /* Init should only be called once per module load. Eventually the |
| 366 | * restriction on the context_disabled check can be loosened. */ |
| 367 | if (WARN_ON(dev_priv->ring[RCS].default_context)) |
Ben Widawsky | 8245be3 | 2013-11-06 13:56:29 -0200 | [diff] [blame] | 368 | return 0; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 369 | |
Ben Widawsky | 07ea0d8 | 2013-02-07 13:34:19 -0800 | [diff] [blame] | 370 | dev_priv->hw_context_size = round_up(get_context_size(dev), 4096); |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 371 | |
Ben Widawsky | 07ea0d8 | 2013-02-07 13:34:19 -0800 | [diff] [blame] | 372 | if (dev_priv->hw_context_size > (1<<20)) { |
Ben Widawsky | bb03641 | 2013-05-25 12:26:38 -0700 | [diff] [blame] | 373 | DRM_DEBUG_DRIVER("Disabling HW Contexts; invalid size\n"); |
Ben Widawsky | 8245be3 | 2013-11-06 13:56:29 -0200 | [diff] [blame] | 374 | return -E2BIG; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 375 | } |
| 376 | |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 377 | dev_priv->ring[RCS].default_context = |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 378 | i915_gem_create_context(dev, NULL, USES_ALIASING_PPGTT(dev)); |
Ben Widawsky | a45d0f6 | 2013-12-06 14:11:05 -0800 | [diff] [blame] | 379 | |
Ben Widawsky | a45d0f6 | 2013-12-06 14:11:05 -0800 | [diff] [blame] | 380 | if (IS_ERR_OR_NULL(dev_priv->ring[RCS].default_context)) { |
| 381 | DRM_DEBUG_DRIVER("Disabling HW Contexts; create failed %ld\n", |
| 382 | PTR_ERR(dev_priv->ring[RCS].default_context)); |
| 383 | return PTR_ERR(dev_priv->ring[RCS].default_context); |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 384 | } |
| 385 | |
Ben Widawsky | 67e3d297 | 2013-12-06 14:11:01 -0800 | [diff] [blame] | 386 | for (i = RCS + 1; i < I915_NUM_RINGS; i++) { |
| 387 | if (!(INTEL_INFO(dev)->ring_mask & (1<<i))) |
| 388 | continue; |
| 389 | |
| 390 | ring = &dev_priv->ring[i]; |
| 391 | |
| 392 | /* NB: RCS will hold a ref for all rings */ |
| 393 | ring->default_context = dev_priv->ring[RCS].default_context; |
| 394 | } |
| 395 | |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 396 | DRM_DEBUG_DRIVER("HW context support initialized\n"); |
Ben Widawsky | 8245be3 | 2013-11-06 13:56:29 -0200 | [diff] [blame] | 397 | return 0; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 398 | } |
| 399 | |
| 400 | void i915_gem_context_fini(struct drm_device *dev) |
| 401 | { |
| 402 | struct drm_i915_private *dev_priv = dev->dev_private; |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 403 | struct i915_hw_context *dctx = dev_priv->ring[RCS].default_context; |
Ben Widawsky | 67e3d297 | 2013-12-06 14:11:01 -0800 | [diff] [blame] | 404 | int i; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 405 | |
Ben Widawsky | 8245be3 | 2013-11-06 13:56:29 -0200 | [diff] [blame] | 406 | if (!HAS_HW_CONTEXTS(dev)) |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 407 | return; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 408 | |
Daniel Vetter | 55a6662 | 2012-06-19 21:55:32 +0200 | [diff] [blame] | 409 | /* The only known way to stop the gpu from accessing the hw context is |
| 410 | * to reset it. Do this as the very last operation to avoid confusing |
| 411 | * other code, leading to spurious errors. */ |
| 412 | intel_gpu_reset(dev); |
| 413 | |
Mika Kuoppala | 168f836 | 2013-05-03 16:29:08 +0300 | [diff] [blame] | 414 | /* When default context is created and switched to, base object refcount |
| 415 | * will be 2 (+1 from object creation and +1 from do_switch()). |
| 416 | * i915_gem_context_fini() will be called after gpu_idle() has switched |
| 417 | * to default context. So we need to unreference the base object once |
| 418 | * to offset the do_switch part, so that i915_gem_context_unreference() |
| 419 | * can then free the base object correctly. */ |
Ben Widawsky | 71b76d0 | 2013-10-14 10:01:37 -0700 | [diff] [blame] | 420 | WARN_ON(!dev_priv->ring[RCS].last_context); |
| 421 | if (dev_priv->ring[RCS].last_context == dctx) { |
| 422 | /* Fake switch to NULL context */ |
| 423 | WARN_ON(dctx->obj->active); |
Ben Widawsky | d7f46fc | 2013-12-06 14:10:55 -0800 | [diff] [blame] | 424 | i915_gem_object_ggtt_unpin(dctx->obj); |
Ben Widawsky | 71b76d0 | 2013-10-14 10:01:37 -0700 | [diff] [blame] | 425 | i915_gem_context_unreference(dctx); |
Ben Widawsky | 67e3d297 | 2013-12-06 14:11:01 -0800 | [diff] [blame] | 426 | dev_priv->ring[RCS].last_context = NULL; |
| 427 | } |
| 428 | |
| 429 | for (i = 0; i < I915_NUM_RINGS; i++) { |
| 430 | struct intel_ring_buffer *ring = &dev_priv->ring[i]; |
| 431 | if (!(INTEL_INFO(dev)->ring_mask & (1<<i))) |
| 432 | continue; |
| 433 | |
| 434 | if (ring->last_context) |
| 435 | i915_gem_context_unreference(ring->last_context); |
| 436 | |
| 437 | ring->default_context = NULL; |
Ben Widawsky | 0009e46 | 2013-12-06 14:11:02 -0800 | [diff] [blame] | 438 | ring->last_context = NULL; |
Ben Widawsky | 71b76d0 | 2013-10-14 10:01:37 -0700 | [diff] [blame] | 439 | } |
| 440 | |
Ben Widawsky | d7f46fc | 2013-12-06 14:10:55 -0800 | [diff] [blame] | 441 | i915_gem_object_ggtt_unpin(dctx->obj); |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 442 | i915_gem_context_unreference(dctx); |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 443 | dev_priv->mm.aliasing_ppgtt = NULL; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 444 | } |
| 445 | |
Ben Widawsky | 2fa48d8 | 2013-12-06 14:11:04 -0800 | [diff] [blame] | 446 | int i915_gem_context_enable(struct drm_i915_private *dev_priv) |
| 447 | { |
| 448 | struct intel_ring_buffer *ring; |
| 449 | int ret, i; |
| 450 | |
| 451 | if (!HAS_HW_CONTEXTS(dev_priv->dev)) |
| 452 | return 0; |
| 453 | |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 454 | /* This is the only place the aliasing PPGTT gets enabled, which means |
| 455 | * it has to happen before we bail on reset */ |
| 456 | if (dev_priv->mm.aliasing_ppgtt) { |
| 457 | struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt; |
| 458 | ppgtt->enable(ppgtt); |
| 459 | } |
| 460 | |
Ben Widawsky | 2fa48d8 | 2013-12-06 14:11:04 -0800 | [diff] [blame] | 461 | /* FIXME: We should make this work, even in reset */ |
| 462 | if (i915_reset_in_progress(&dev_priv->gpu_error)) |
| 463 | return 0; |
| 464 | |
| 465 | BUG_ON(!dev_priv->ring[RCS].default_context); |
Ben Widawsky | bdf4fd7 | 2013-12-06 14:11:18 -0800 | [diff] [blame] | 466 | |
Ben Widawsky | 2fa48d8 | 2013-12-06 14:11:04 -0800 | [diff] [blame] | 467 | for_each_ring(ring, dev_priv, i) { |
| 468 | ret = do_switch(ring, ring->default_context); |
| 469 | if (ret) |
| 470 | return ret; |
| 471 | } |
| 472 | |
| 473 | return 0; |
| 474 | } |
| 475 | |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 476 | static int context_idr_cleanup(int id, void *p, void *data) |
| 477 | { |
Daniel Vetter | 73c273e | 2012-06-19 20:27:39 +0200 | [diff] [blame] | 478 | struct i915_hw_context *ctx = p; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 479 | |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 480 | /* Ignore the default context because close will handle it */ |
| 481 | if (is_default_context(ctx)) |
| 482 | return 0; |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 483 | |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 484 | i915_gem_context_unreference(ctx); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 485 | return 0; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 486 | } |
| 487 | |
Ben Widawsky | e422b88 | 2013-12-06 14:10:58 -0800 | [diff] [blame] | 488 | int i915_gem_context_open(struct drm_device *dev, struct drm_file *file) |
| 489 | { |
| 490 | struct drm_i915_file_private *file_priv = file->driver_priv; |
Ben Widawsky | c482972 | 2013-12-06 14:11:20 -0800 | [diff] [blame] | 491 | struct drm_i915_private *dev_priv = dev->dev_private; |
Ben Widawsky | e422b88 | 2013-12-06 14:10:58 -0800 | [diff] [blame] | 492 | |
Ben Widawsky | c482972 | 2013-12-06 14:11:20 -0800 | [diff] [blame] | 493 | if (!HAS_HW_CONTEXTS(dev)) { |
| 494 | /* Cheat for hang stats */ |
| 495 | file_priv->private_default_ctx = |
| 496 | kzalloc(sizeof(struct i915_hw_context), GFP_KERNEL); |
| 497 | file_priv->private_default_ctx->vm = &dev_priv->gtt.base; |
Ben Widawsky | e422b88 | 2013-12-06 14:10:58 -0800 | [diff] [blame] | 498 | return 0; |
Ben Widawsky | c482972 | 2013-12-06 14:11:20 -0800 | [diff] [blame] | 499 | } |
Ben Widawsky | e422b88 | 2013-12-06 14:10:58 -0800 | [diff] [blame] | 500 | |
| 501 | idr_init(&file_priv->context_idr); |
| 502 | |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 503 | mutex_lock(&dev->struct_mutex); |
| 504 | file_priv->private_default_ctx = |
Ben Widawsky | 7e0d96b | 2013-12-06 14:11:26 -0800 | [diff] [blame] | 505 | i915_gem_create_context(dev, file_priv, USES_FULL_PPGTT(dev)); |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 506 | mutex_unlock(&dev->struct_mutex); |
| 507 | |
| 508 | if (IS_ERR(file_priv->private_default_ctx)) { |
| 509 | idr_destroy(&file_priv->context_idr); |
| 510 | return PTR_ERR(file_priv->private_default_ctx); |
| 511 | } |
| 512 | |
Ben Widawsky | e422b88 | 2013-12-06 14:10:58 -0800 | [diff] [blame] | 513 | return 0; |
| 514 | } |
| 515 | |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 516 | void i915_gem_context_close(struct drm_device *dev, struct drm_file *file) |
| 517 | { |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 518 | struct drm_i915_file_private *file_priv = file->driver_priv; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 519 | |
Ben Widawsky | c482972 | 2013-12-06 14:11:20 -0800 | [diff] [blame] | 520 | if (!HAS_HW_CONTEXTS(dev)) { |
| 521 | kfree(file_priv->private_default_ctx); |
Ben Widawsky | e422b88 | 2013-12-06 14:10:58 -0800 | [diff] [blame] | 522 | return; |
Ben Widawsky | c482972 | 2013-12-06 14:11:20 -0800 | [diff] [blame] | 523 | } |
Ben Widawsky | e422b88 | 2013-12-06 14:10:58 -0800 | [diff] [blame] | 524 | |
Daniel Vetter | 73c273e | 2012-06-19 20:27:39 +0200 | [diff] [blame] | 525 | idr_for_each(&file_priv->context_idr, context_idr_cleanup, NULL); |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 526 | i915_gem_context_unreference(file_priv->private_default_ctx); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 527 | idr_destroy(&file_priv->context_idr); |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 528 | } |
| 529 | |
Ben Widawsky | 41bde55 | 2013-12-06 14:11:21 -0800 | [diff] [blame] | 530 | struct i915_hw_context * |
Ben Widawsky | 4052105 | 2012-06-04 14:42:43 -0700 | [diff] [blame] | 531 | i915_gem_context_get(struct drm_i915_file_private *file_priv, u32 id) |
| 532 | { |
Ben Widawsky | 72ad5c4 | 2014-01-02 19:50:27 -1000 | [diff] [blame] | 533 | struct i915_hw_context *ctx; |
| 534 | |
Ben Widawsky | 41bde55 | 2013-12-06 14:11:21 -0800 | [diff] [blame] | 535 | if (!HAS_HW_CONTEXTS(file_priv->dev_priv->dev)) |
| 536 | return file_priv->private_default_ctx; |
| 537 | |
Ben Widawsky | 72ad5c4 | 2014-01-02 19:50:27 -1000 | [diff] [blame] | 538 | ctx = (struct i915_hw_context *)idr_find(&file_priv->context_idr, id); |
| 539 | if (!ctx) |
| 540 | return ERR_PTR(-ENOENT); |
| 541 | |
| 542 | return ctx; |
Ben Widawsky | 254f965 | 2012-06-04 14:42:42 -0700 | [diff] [blame] | 543 | } |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 544 | |
| 545 | static inline int |
| 546 | mi_set_context(struct intel_ring_buffer *ring, |
| 547 | struct i915_hw_context *new_context, |
| 548 | u32 hw_flags) |
| 549 | { |
| 550 | int ret; |
| 551 | |
Ben Widawsky | 12b0286 | 2012-06-04 14:42:50 -0700 | [diff] [blame] | 552 | /* w/a: If Flush TLB Invalidation Mode is enabled, driver must do a TLB |
| 553 | * invalidation prior to MI_SET_CONTEXT. On GEN6 we don't set the value |
| 554 | * explicitly, so we rely on the value at ring init, stored in |
| 555 | * itlb_before_ctx_switch. |
| 556 | */ |
| 557 | if (IS_GEN6(ring->dev) && ring->itlb_before_ctx_switch) { |
Chris Wilson | ac82ea2 | 2012-10-01 14:27:04 +0100 | [diff] [blame] | 558 | ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, 0); |
Ben Widawsky | 12b0286 | 2012-06-04 14:42:50 -0700 | [diff] [blame] | 559 | if (ret) |
| 560 | return ret; |
| 561 | } |
| 562 | |
Ben Widawsky | e37ec39 | 2012-06-04 14:42:48 -0700 | [diff] [blame] | 563 | ret = intel_ring_begin(ring, 6); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 564 | if (ret) |
| 565 | return ret; |
| 566 | |
Damien Lespiau | 8693a82 | 2013-05-03 18:48:11 +0100 | [diff] [blame] | 567 | /* WaProgramMiArbOnOffAroundMiSetContext:ivb,vlv,hsw */ |
Ben Widawsky | e37ec39 | 2012-06-04 14:42:48 -0700 | [diff] [blame] | 568 | if (IS_GEN7(ring->dev)) |
| 569 | intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_DISABLE); |
| 570 | else |
| 571 | intel_ring_emit(ring, MI_NOOP); |
| 572 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 573 | intel_ring_emit(ring, MI_NOOP); |
| 574 | intel_ring_emit(ring, MI_SET_CONTEXT); |
Ben Widawsky | f343c5f | 2013-07-05 14:41:04 -0700 | [diff] [blame] | 575 | intel_ring_emit(ring, i915_gem_obj_ggtt_offset(new_context->obj) | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 576 | MI_MM_SPACE_GTT | |
| 577 | MI_SAVE_EXT_STATE_EN | |
| 578 | MI_RESTORE_EXT_STATE_EN | |
| 579 | hw_flags); |
| 580 | /* w/a: MI_SET_CONTEXT must always be followed by MI_NOOP */ |
| 581 | intel_ring_emit(ring, MI_NOOP); |
| 582 | |
Ben Widawsky | e37ec39 | 2012-06-04 14:42:48 -0700 | [diff] [blame] | 583 | if (IS_GEN7(ring->dev)) |
| 584 | intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_ENABLE); |
| 585 | else |
| 586 | intel_ring_emit(ring, MI_NOOP); |
| 587 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 588 | intel_ring_advance(ring); |
| 589 | |
| 590 | return ret; |
| 591 | } |
| 592 | |
Ben Widawsky | 67e3d297 | 2013-12-06 14:11:01 -0800 | [diff] [blame] | 593 | static int do_switch(struct intel_ring_buffer *ring, |
| 594 | struct i915_hw_context *to) |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 595 | { |
Ben Widawsky | 6f65e29 | 2013-12-06 14:10:56 -0800 | [diff] [blame] | 596 | struct drm_i915_private *dev_priv = ring->dev->dev_private; |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 597 | struct i915_hw_context *from = ring->last_context; |
Ben Widawsky | 7e0d96b | 2013-12-06 14:11:26 -0800 | [diff] [blame] | 598 | struct i915_hw_ppgtt *ppgtt = ctx_to_ppgtt(to); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 599 | u32 hw_flags = 0; |
Ben Widawsky | 3ccfd19 | 2013-09-18 19:03:18 -0700 | [diff] [blame] | 600 | int ret, i; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 601 | |
Ben Widawsky | 67e3d297 | 2013-12-06 14:11:01 -0800 | [diff] [blame] | 602 | if (from != NULL && ring == &dev_priv->ring[RCS]) { |
| 603 | BUG_ON(from->obj == NULL); |
| 604 | BUG_ON(!i915_gem_obj_is_pinned(from->obj)); |
| 605 | } |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 606 | |
Ben Widawsky | 0009e46 | 2013-12-06 14:11:02 -0800 | [diff] [blame] | 607 | if (from == to && from->last_ring == ring && !to->remap_slice) |
Chris Wilson | 9a3b530 | 2012-07-15 12:34:24 +0100 | [diff] [blame] | 608 | return 0; |
| 609 | |
Ben Widawsky | 7e0d96b | 2013-12-06 14:11:26 -0800 | [diff] [blame] | 610 | /* Trying to pin first makes error handling easier. */ |
| 611 | if (ring == &dev_priv->ring[RCS]) { |
| 612 | ret = i915_gem_obj_ggtt_pin(to->obj, |
| 613 | get_context_alignment(ring->dev), |
| 614 | false, false); |
| 615 | if (ret) |
| 616 | return ret; |
Ben Widawsky | 67e3d297 | 2013-12-06 14:11:01 -0800 | [diff] [blame] | 617 | } |
| 618 | |
Daniel Vetter | acc240d | 2013-12-05 15:42:34 +0100 | [diff] [blame] | 619 | /* |
| 620 | * Pin can switch back to the default context if we end up calling into |
| 621 | * evict_everything - as a last ditch gtt defrag effort that also |
| 622 | * switches to the default context. Hence we need to reload from here. |
| 623 | */ |
| 624 | from = ring->last_context; |
| 625 | |
Ben Widawsky | 7e0d96b | 2013-12-06 14:11:26 -0800 | [diff] [blame] | 626 | if (USES_FULL_PPGTT(ring->dev)) { |
| 627 | ret = ppgtt->switch_mm(ppgtt, ring, false); |
| 628 | if (ret) |
| 629 | goto unpin_out; |
| 630 | } |
| 631 | |
| 632 | if (ring != &dev_priv->ring[RCS]) { |
| 633 | if (from) |
| 634 | i915_gem_context_unreference(from); |
| 635 | goto done; |
| 636 | } |
| 637 | |
Daniel Vetter | acc240d | 2013-12-05 15:42:34 +0100 | [diff] [blame] | 638 | /* |
| 639 | * Clear this page out of any CPU caches for coherent swap-in/out. Note |
Chris Wilson | d3373a2 | 2012-07-15 12:34:22 +0100 | [diff] [blame] | 640 | * that thanks to write = false in this call and us not setting any gpu |
| 641 | * write domains when putting a context object onto the active list |
| 642 | * (when switching away from it), this won't block. |
Daniel Vetter | acc240d | 2013-12-05 15:42:34 +0100 | [diff] [blame] | 643 | * |
| 644 | * XXX: We need a real interface to do this instead of trickery. |
| 645 | */ |
Chris Wilson | d3373a2 | 2012-07-15 12:34:22 +0100 | [diff] [blame] | 646 | ret = i915_gem_object_set_to_gtt_domain(to->obj, false); |
Ben Widawsky | 7e0d96b | 2013-12-06 14:11:26 -0800 | [diff] [blame] | 647 | if (ret) |
| 648 | goto unpin_out; |
Chris Wilson | d3373a2 | 2012-07-15 12:34:22 +0100 | [diff] [blame] | 649 | |
Ben Widawsky | 6f65e29 | 2013-12-06 14:10:56 -0800 | [diff] [blame] | 650 | if (!to->obj->has_global_gtt_mapping) { |
| 651 | struct i915_vma *vma = i915_gem_obj_to_vma(to->obj, |
| 652 | &dev_priv->gtt.base); |
| 653 | vma->bind_vma(vma, to->obj->cache_level, GLOBAL_BIND); |
| 654 | } |
Daniel Vetter | 3af7b85 | 2012-06-14 00:08:32 +0200 | [diff] [blame] | 655 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 656 | if (!to->is_initialized || is_default_context(to)) |
| 657 | hw_flags |= MI_RESTORE_INHIBIT; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 658 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 659 | ret = mi_set_context(ring, to, hw_flags); |
Ben Widawsky | 7e0d96b | 2013-12-06 14:11:26 -0800 | [diff] [blame] | 660 | if (ret) |
| 661 | goto unpin_out; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 662 | |
Ben Widawsky | 3ccfd19 | 2013-09-18 19:03:18 -0700 | [diff] [blame] | 663 | for (i = 0; i < MAX_L3_SLICES; i++) { |
| 664 | if (!(to->remap_slice & (1<<i))) |
| 665 | continue; |
| 666 | |
| 667 | ret = i915_gem_l3_remap(ring, i); |
| 668 | /* If it failed, try again next round */ |
| 669 | if (ret) |
| 670 | DRM_DEBUG_DRIVER("L3 remapping failed\n"); |
| 671 | else |
| 672 | to->remap_slice &= ~(1<<i); |
| 673 | } |
| 674 | |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 675 | /* The backing object for the context is done after switching to the |
| 676 | * *next* context. Therefore we cannot retire the previous context until |
| 677 | * the next context has already started running. In fact, the below code |
| 678 | * is a bit suboptimal because the retiring can occur simply after the |
| 679 | * MI_SET_CONTEXT instead of when the next seqno has completed. |
| 680 | */ |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 681 | if (from != NULL) { |
| 682 | from->obj->base.read_domains = I915_GEM_DOMAIN_INSTRUCTION; |
Ben Widawsky | e2d05a8 | 2013-09-24 09:57:58 -0700 | [diff] [blame] | 683 | i915_vma_move_to_active(i915_gem_obj_to_ggtt(from->obj), ring); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 684 | /* As long as MI_SET_CONTEXT is serializing, ie. it flushes the |
| 685 | * whole damn pipeline, we don't need to explicitly mark the |
| 686 | * object dirty. The only exception is that the context must be |
| 687 | * correct in case the object gets swapped out. Ideally we'd be |
| 688 | * able to defer doing this until we know the object would be |
| 689 | * swapped, but there is no way to do that yet. |
| 690 | */ |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 691 | from->obj->dirty = 1; |
| 692 | BUG_ON(from->obj->ring != ring); |
Chris Wilson | b259b31 | 2012-07-15 12:34:23 +0100 | [diff] [blame] | 693 | |
Chris Wilson | c0321e2 | 2013-08-26 19:50:53 -0300 | [diff] [blame] | 694 | /* obj is kept alive until the next request by its active ref */ |
Ben Widawsky | d7f46fc | 2013-12-06 14:10:55 -0800 | [diff] [blame] | 695 | i915_gem_object_ggtt_unpin(from->obj); |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 696 | i915_gem_context_unreference(from); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 697 | } |
| 698 | |
Ben Widawsky | ad1d219 | 2013-12-28 13:31:49 -0800 | [diff] [blame] | 699 | to->is_initialized = true; |
| 700 | |
Ben Widawsky | 67e3d297 | 2013-12-06 14:11:01 -0800 | [diff] [blame] | 701 | done: |
Chris Wilson | 112522f | 2013-05-02 16:48:07 +0300 | [diff] [blame] | 702 | i915_gem_context_reference(to); |
| 703 | ring->last_context = to; |
Ben Widawsky | 0009e46 | 2013-12-06 14:11:02 -0800 | [diff] [blame] | 704 | to->last_ring = ring; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 705 | |
| 706 | return 0; |
Ben Widawsky | 7e0d96b | 2013-12-06 14:11:26 -0800 | [diff] [blame] | 707 | |
| 708 | unpin_out: |
| 709 | if (ring->id == RCS) |
| 710 | i915_gem_object_ggtt_unpin(to->obj); |
| 711 | return ret; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 712 | } |
| 713 | |
| 714 | /** |
| 715 | * i915_switch_context() - perform a GPU context switch. |
| 716 | * @ring: ring for which we'll execute the context switch |
| 717 | * @file_priv: file_priv associated with the context, may be NULL |
| 718 | * @id: context id number |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 719 | * |
| 720 | * The context life cycle is simple. The context refcount is incremented and |
| 721 | * decremented by 1 and create and destroy. If the context is in use by the GPU, |
| 722 | * it will have a refoucnt > 1. This allows us to destroy the context abstract |
| 723 | * object while letting the normal object tracking destroy the backing BO. |
| 724 | */ |
| 725 | int i915_switch_context(struct intel_ring_buffer *ring, |
| 726 | struct drm_file *file, |
Ben Widawsky | 41bde55 | 2013-12-06 14:11:21 -0800 | [diff] [blame] | 727 | struct i915_hw_context *to) |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 728 | { |
| 729 | struct drm_i915_private *dev_priv = ring->dev->dev_private; |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 730 | |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 731 | WARN_ON(!mutex_is_locked(&dev_priv->dev->struct_mutex)); |
| 732 | |
Ben Widawsky | 41bde55 | 2013-12-06 14:11:21 -0800 | [diff] [blame] | 733 | BUG_ON(file && to == NULL); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 734 | |
Ben Widawsky | c482972 | 2013-12-06 14:11:20 -0800 | [diff] [blame] | 735 | /* We have the fake context, but don't supports switching. */ |
| 736 | if (!HAS_HW_CONTEXTS(ring->dev)) |
| 737 | return 0; |
| 738 | |
Ben Widawsky | 67e3d297 | 2013-12-06 14:11:01 -0800 | [diff] [blame] | 739 | return do_switch(ring, to); |
Ben Widawsky | e055684 | 2012-06-04 14:42:46 -0700 | [diff] [blame] | 740 | } |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 741 | |
| 742 | int i915_gem_context_create_ioctl(struct drm_device *dev, void *data, |
| 743 | struct drm_file *file) |
| 744 | { |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 745 | struct drm_i915_gem_context_create *args = data; |
| 746 | struct drm_i915_file_private *file_priv = file->driver_priv; |
| 747 | struct i915_hw_context *ctx; |
| 748 | int ret; |
| 749 | |
| 750 | if (!(dev->driver->driver_features & DRIVER_GEM)) |
| 751 | return -ENODEV; |
| 752 | |
Ben Widawsky | 8245be3 | 2013-11-06 13:56:29 -0200 | [diff] [blame] | 753 | if (!HAS_HW_CONTEXTS(dev)) |
Daniel Vetter | 5fa8be6 | 2012-06-19 17:16:01 +0200 | [diff] [blame] | 754 | return -ENODEV; |
| 755 | |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 756 | ret = i915_mutex_lock_interruptible(dev); |
| 757 | if (ret) |
| 758 | return ret; |
| 759 | |
Ben Widawsky | 7e0d96b | 2013-12-06 14:11:26 -0800 | [diff] [blame] | 760 | ctx = i915_gem_create_context(dev, file_priv, USES_FULL_PPGTT(dev)); |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 761 | mutex_unlock(&dev->struct_mutex); |
Dan Carpenter | be63638 | 2012-07-17 09:44:49 +0300 | [diff] [blame] | 762 | if (IS_ERR(ctx)) |
| 763 | return PTR_ERR(ctx); |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 764 | |
| 765 | args->ctx_id = ctx->id; |
| 766 | DRM_DEBUG_DRIVER("HW context %d created\n", args->ctx_id); |
| 767 | |
Dan Carpenter | be63638 | 2012-07-17 09:44:49 +0300 | [diff] [blame] | 768 | return 0; |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 769 | } |
| 770 | |
| 771 | int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data, |
| 772 | struct drm_file *file) |
| 773 | { |
| 774 | struct drm_i915_gem_context_destroy *args = data; |
| 775 | struct drm_i915_file_private *file_priv = file->driver_priv; |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 776 | struct i915_hw_context *ctx; |
| 777 | int ret; |
| 778 | |
| 779 | if (!(dev->driver->driver_features & DRIVER_GEM)) |
| 780 | return -ENODEV; |
| 781 | |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 782 | if (args->ctx_id == DEFAULT_CONTEXT_ID) |
Ben Widawsky | c2cf241 | 2013-12-24 16:02:54 -0800 | [diff] [blame] | 783 | return -ENOENT; |
Ben Widawsky | 0eea67e | 2013-12-06 14:11:19 -0800 | [diff] [blame] | 784 | |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 785 | ret = i915_mutex_lock_interruptible(dev); |
| 786 | if (ret) |
| 787 | return ret; |
| 788 | |
| 789 | ctx = i915_gem_context_get(file_priv, args->ctx_id); |
Ben Widawsky | 72ad5c4 | 2014-01-02 19:50:27 -1000 | [diff] [blame] | 790 | if (IS_ERR(ctx)) { |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 791 | mutex_unlock(&dev->struct_mutex); |
Ben Widawsky | 72ad5c4 | 2014-01-02 19:50:27 -1000 | [diff] [blame] | 792 | return PTR_ERR(ctx); |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 793 | } |
| 794 | |
Mika Kuoppala | dce3271 | 2013-04-30 13:30:33 +0300 | [diff] [blame] | 795 | idr_remove(&ctx->file_priv->context_idr, ctx->id); |
| 796 | i915_gem_context_unreference(ctx); |
Ben Widawsky | 8462481 | 2012-06-04 14:42:54 -0700 | [diff] [blame] | 797 | mutex_unlock(&dev->struct_mutex); |
| 798 | |
| 799 | DRM_DEBUG_DRIVER("HW context %d destroyed\n", args->ctx_id); |
| 800 | return 0; |
| 801 | } |