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![Chris Wilson](/assets/img/avatar_default.png)
Now that we are confident in providing full-ppgtt where supported, remove the ability to override the context isolation. v2: Remove faked aliasing-ppgtt for testing as it no longer is accepted. v3: s/USES/HAS/ to match usage and reject attempts to load the module on old GVT-g setups that do not provide support for full-ppgtt. v4: Insulate ABI ppGTT values from our internal enum (later plans involve moving ppGTT depth out of the enum, thus potentially breaking ABI unless we document the current values). Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Acked-by: Zhi Wang <zhi.a.wang@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180926201222.5643-1-chris@chris-wilson.co.uk
1032 lines
27 KiB
C
1032 lines
27 KiB
C
/*
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* Copyright © 2011-2012 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Ben Widawsky <ben@bwidawsk.net>
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*
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*/
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/*
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* This file implements HW context support. On gen5+ a HW context consists of an
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* opaque GPU object which is referenced at times of context saves and restores.
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* With RC6 enabled, the context is also referenced as the GPU enters and exists
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* from RC6 (GPU has it's own internal power context, except on gen5). Though
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* something like a context does exist for the media ring, the code only
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* supports contexts for the render ring.
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*
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* In software, there is a distinction between contexts created by the user,
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* and the default HW context. The default HW context is used by GPU clients
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* that do not request setup of their own hardware context. The default
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* context's state is never restored to help prevent programming errors. This
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* would happen if a client ran and piggy-backed off another clients GPU state.
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* The default context only exists to give the GPU some offset to load as the
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* current to invoke a save of the context we actually care about. In fact, the
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* code could likely be constructed, albeit in a more complicated fashion, to
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* never use the default context, though that limits the driver's ability to
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* swap out, and/or destroy other contexts.
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*
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* All other contexts are created as a request by the GPU client. These contexts
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* store GPU state, and thus allow GPU clients to not re-emit state (and
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* potentially query certain state) at any time. The kernel driver makes
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* certain that the appropriate commands are inserted.
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*
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* The context life cycle is semi-complicated in that context BOs may live
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* longer than the context itself because of the way the hardware, and object
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* tracking works. Below is a very crude representation of the state machine
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* describing the context life.
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* refcount pincount active
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* S0: initial state 0 0 0
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* S1: context created 1 0 0
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* S2: context is currently running 2 1 X
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* S3: GPU referenced, but not current 2 0 1
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* S4: context is current, but destroyed 1 1 0
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* S5: like S3, but destroyed 1 0 1
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*
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* The most common (but not all) transitions:
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* S0->S1: client creates a context
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* S1->S2: client submits execbuf with context
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* S2->S3: other clients submits execbuf with context
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* S3->S1: context object was retired
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* S3->S2: clients submits another execbuf
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* S2->S4: context destroy called with current context
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* S3->S5->S0: destroy path
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* S4->S5->S0: destroy path on current context
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*
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* There are two confusing terms used above:
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* The "current context" means the context which is currently running on the
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* GPU. The GPU has loaded its state already and has stored away the gtt
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* offset of the BO. The GPU is not actively referencing the data at this
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* offset, but it will on the next context switch. The only way to avoid this
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* is to do a GPU reset.
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*
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* An "active context' is one which was previously the "current context" and is
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* on the active list waiting for the next context switch to occur. Until this
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* happens, the object must remain at the same gtt offset. It is therefore
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* possible to destroy a context, but it is still active.
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*
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*/
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#include <linux/log2.h>
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#include <drm/drmP.h>
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#include <drm/i915_drm.h>
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#include "i915_drv.h"
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#include "i915_trace.h"
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#include "intel_workarounds.h"
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#define ALL_L3_SLICES(dev) (1 << NUM_L3_SLICES(dev)) - 1
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static void lut_close(struct i915_gem_context *ctx)
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{
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struct i915_lut_handle *lut, *ln;
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struct radix_tree_iter iter;
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void __rcu **slot;
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list_for_each_entry_safe(lut, ln, &ctx->handles_list, ctx_link) {
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list_del(&lut->obj_link);
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kmem_cache_free(ctx->i915->luts, lut);
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}
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rcu_read_lock();
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radix_tree_for_each_slot(slot, &ctx->handles_vma, &iter, 0) {
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struct i915_vma *vma = rcu_dereference_raw(*slot);
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radix_tree_iter_delete(&ctx->handles_vma, &iter, slot);
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__i915_gem_object_release_unless_active(vma->obj);
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}
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rcu_read_unlock();
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}
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static inline int new_hw_id(struct drm_i915_private *i915, gfp_t gfp)
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{
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unsigned int max;
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lockdep_assert_held(&i915->contexts.mutex);
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if (INTEL_GEN(i915) >= 11)
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max = GEN11_MAX_CONTEXT_HW_ID;
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else if (USES_GUC_SUBMISSION(i915))
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/*
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* When using GuC in proxy submission, GuC consumes the
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* highest bit in the context id to indicate proxy submission.
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*/
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max = MAX_GUC_CONTEXT_HW_ID;
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else
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max = MAX_CONTEXT_HW_ID;
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return ida_simple_get(&i915->contexts.hw_ida, 0, max, gfp);
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}
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static int steal_hw_id(struct drm_i915_private *i915)
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{
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struct i915_gem_context *ctx, *cn;
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LIST_HEAD(pinned);
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int id = -ENOSPC;
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lockdep_assert_held(&i915->contexts.mutex);
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list_for_each_entry_safe(ctx, cn,
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&i915->contexts.hw_id_list, hw_id_link) {
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if (atomic_read(&ctx->hw_id_pin_count)) {
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list_move_tail(&ctx->hw_id_link, &pinned);
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continue;
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}
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GEM_BUG_ON(!ctx->hw_id); /* perma-pinned kernel context */
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list_del_init(&ctx->hw_id_link);
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id = ctx->hw_id;
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break;
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}
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/*
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* Remember how far we got up on the last repossesion scan, so the
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* list is kept in a "least recently scanned" order.
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*/
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list_splice_tail(&pinned, &i915->contexts.hw_id_list);
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return id;
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}
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static int assign_hw_id(struct drm_i915_private *i915, unsigned int *out)
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{
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int ret;
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lockdep_assert_held(&i915->contexts.mutex);
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/*
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* We prefer to steal/stall ourselves and our users over that of the
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* entire system. That may be a little unfair to our users, and
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* even hurt high priority clients. The choice is whether to oomkill
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* something else, or steal a context id.
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*/
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ret = new_hw_id(i915, GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
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if (unlikely(ret < 0)) {
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ret = steal_hw_id(i915);
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if (ret < 0) /* once again for the correct errno code */
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ret = new_hw_id(i915, GFP_KERNEL);
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if (ret < 0)
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return ret;
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}
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*out = ret;
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return 0;
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}
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static void release_hw_id(struct i915_gem_context *ctx)
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{
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struct drm_i915_private *i915 = ctx->i915;
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if (list_empty(&ctx->hw_id_link))
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return;
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mutex_lock(&i915->contexts.mutex);
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if (!list_empty(&ctx->hw_id_link)) {
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ida_simple_remove(&i915->contexts.hw_ida, ctx->hw_id);
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list_del_init(&ctx->hw_id_link);
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}
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mutex_unlock(&i915->contexts.mutex);
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}
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static void i915_gem_context_free(struct i915_gem_context *ctx)
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{
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unsigned int n;
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lockdep_assert_held(&ctx->i915->drm.struct_mutex);
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GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
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release_hw_id(ctx);
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i915_ppgtt_put(ctx->ppgtt);
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for (n = 0; n < ARRAY_SIZE(ctx->__engine); n++) {
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struct intel_context *ce = &ctx->__engine[n];
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if (ce->ops)
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ce->ops->destroy(ce);
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}
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kfree(ctx->name);
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put_pid(ctx->pid);
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list_del(&ctx->link);
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kfree_rcu(ctx, rcu);
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}
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static void contexts_free(struct drm_i915_private *i915)
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{
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struct llist_node *freed = llist_del_all(&i915->contexts.free_list);
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struct i915_gem_context *ctx, *cn;
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lockdep_assert_held(&i915->drm.struct_mutex);
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llist_for_each_entry_safe(ctx, cn, freed, free_link)
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i915_gem_context_free(ctx);
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}
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static void contexts_free_first(struct drm_i915_private *i915)
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{
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struct i915_gem_context *ctx;
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struct llist_node *freed;
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lockdep_assert_held(&i915->drm.struct_mutex);
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freed = llist_del_first(&i915->contexts.free_list);
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if (!freed)
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return;
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ctx = container_of(freed, typeof(*ctx), free_link);
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i915_gem_context_free(ctx);
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}
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static void contexts_free_worker(struct work_struct *work)
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{
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struct drm_i915_private *i915 =
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container_of(work, typeof(*i915), contexts.free_work);
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mutex_lock(&i915->drm.struct_mutex);
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contexts_free(i915);
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mutex_unlock(&i915->drm.struct_mutex);
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}
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void i915_gem_context_release(struct kref *ref)
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{
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struct i915_gem_context *ctx = container_of(ref, typeof(*ctx), ref);
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struct drm_i915_private *i915 = ctx->i915;
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trace_i915_context_free(ctx);
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if (llist_add(&ctx->free_link, &i915->contexts.free_list))
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queue_work(i915->wq, &i915->contexts.free_work);
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}
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static void context_close(struct i915_gem_context *ctx)
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{
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i915_gem_context_set_closed(ctx);
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/*
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* This context will never again be assinged to HW, so we can
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* reuse its ID for the next context.
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*/
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release_hw_id(ctx);
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/*
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* The LUT uses the VMA as a backpointer to unref the object,
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* so we need to clear the LUT before we close all the VMA (inside
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* the ppgtt).
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*/
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lut_close(ctx);
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if (ctx->ppgtt)
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i915_ppgtt_close(&ctx->ppgtt->vm);
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ctx->file_priv = ERR_PTR(-EBADF);
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i915_gem_context_put(ctx);
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}
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static u32 default_desc_template(const struct drm_i915_private *i915,
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const struct i915_hw_ppgtt *ppgtt)
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{
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u32 address_mode;
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u32 desc;
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desc = GEN8_CTX_VALID | GEN8_CTX_PRIVILEGE;
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address_mode = INTEL_LEGACY_32B_CONTEXT;
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if (ppgtt && i915_vm_is_48bit(&ppgtt->vm))
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address_mode = INTEL_LEGACY_64B_CONTEXT;
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desc |= address_mode << GEN8_CTX_ADDRESSING_MODE_SHIFT;
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if (IS_GEN8(i915))
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desc |= GEN8_CTX_L3LLC_COHERENT;
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/* TODO: WaDisableLiteRestore when we start using semaphore
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* signalling between Command Streamers
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* ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE;
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*/
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return desc;
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}
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static struct i915_gem_context *
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__create_hw_context(struct drm_i915_private *dev_priv,
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struct drm_i915_file_private *file_priv)
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{
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struct i915_gem_context *ctx;
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unsigned int n;
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int ret;
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (ctx == NULL)
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return ERR_PTR(-ENOMEM);
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kref_init(&ctx->ref);
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list_add_tail(&ctx->link, &dev_priv->contexts.list);
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ctx->i915 = dev_priv;
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ctx->sched.priority = I915_PRIORITY_NORMAL;
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for (n = 0; n < ARRAY_SIZE(ctx->__engine); n++) {
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struct intel_context *ce = &ctx->__engine[n];
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ce->gem_context = ctx;
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}
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INIT_RADIX_TREE(&ctx->handles_vma, GFP_KERNEL);
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INIT_LIST_HEAD(&ctx->handles_list);
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INIT_LIST_HEAD(&ctx->hw_id_link);
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/* Default context will never have a file_priv */
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ret = DEFAULT_CONTEXT_HANDLE;
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if (file_priv) {
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ret = idr_alloc(&file_priv->context_idr, ctx,
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DEFAULT_CONTEXT_HANDLE, 0, GFP_KERNEL);
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if (ret < 0)
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goto err_lut;
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}
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ctx->user_handle = ret;
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ctx->file_priv = file_priv;
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if (file_priv) {
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ctx->pid = get_task_pid(current, PIDTYPE_PID);
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ctx->name = kasprintf(GFP_KERNEL, "%s[%d]/%x",
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current->comm,
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pid_nr(ctx->pid),
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ctx->user_handle);
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if (!ctx->name) {
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ret = -ENOMEM;
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goto err_pid;
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}
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}
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/* NB: Mark all slices as needing a remap so that when the context first
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* loads it will restore whatever remap state already exists. If there
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* is no remap info, it will be a NOP. */
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ctx->remap_slice = ALL_L3_SLICES(dev_priv);
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i915_gem_context_set_bannable(ctx);
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ctx->ring_size = 4 * PAGE_SIZE;
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ctx->desc_template =
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default_desc_template(dev_priv, dev_priv->mm.aliasing_ppgtt);
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return ctx;
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err_pid:
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put_pid(ctx->pid);
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idr_remove(&file_priv->context_idr, ctx->user_handle);
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err_lut:
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context_close(ctx);
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return ERR_PTR(ret);
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}
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|
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static void __destroy_hw_context(struct i915_gem_context *ctx,
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struct drm_i915_file_private *file_priv)
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{
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idr_remove(&file_priv->context_idr, ctx->user_handle);
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context_close(ctx);
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}
|
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|
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static struct i915_gem_context *
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i915_gem_create_context(struct drm_i915_private *dev_priv,
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struct drm_i915_file_private *file_priv)
|
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{
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struct i915_gem_context *ctx;
|
|
|
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lockdep_assert_held(&dev_priv->drm.struct_mutex);
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|
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/* Reap the most stale context */
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contexts_free_first(dev_priv);
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ctx = __create_hw_context(dev_priv, file_priv);
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if (IS_ERR(ctx))
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return ctx;
|
|
|
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if (HAS_FULL_PPGTT(dev_priv)) {
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struct i915_hw_ppgtt *ppgtt;
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|
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ppgtt = i915_ppgtt_create(dev_priv, file_priv);
|
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if (IS_ERR(ppgtt)) {
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DRM_DEBUG_DRIVER("PPGTT setup failed (%ld)\n",
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PTR_ERR(ppgtt));
|
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__destroy_hw_context(ctx, file_priv);
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return ERR_CAST(ppgtt);
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}
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|
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ctx->ppgtt = ppgtt;
|
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ctx->desc_template = default_desc_template(dev_priv, ppgtt);
|
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}
|
|
|
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trace_i915_context_create(ctx);
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|
|
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return ctx;
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}
|
|
|
|
/**
|
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* i915_gem_context_create_gvt - create a GVT GEM context
|
|
* @dev: drm device *
|
|
*
|
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* This function is used to create a GVT specific GEM context.
|
|
*
|
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* Returns:
|
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* pointer to i915_gem_context on success, error pointer if failed
|
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*
|
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*/
|
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struct i915_gem_context *
|
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i915_gem_context_create_gvt(struct drm_device *dev)
|
|
{
|
|
struct i915_gem_context *ctx;
|
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int ret;
|
|
|
|
if (!IS_ENABLED(CONFIG_DRM_I915_GVT))
|
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return ERR_PTR(-ENODEV);
|
|
|
|
ret = i915_mutex_lock_interruptible(dev);
|
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if (ret)
|
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return ERR_PTR(ret);
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|
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ctx = __create_hw_context(to_i915(dev), NULL);
|
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if (IS_ERR(ctx))
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goto out;
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|
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ctx->file_priv = ERR_PTR(-EBADF);
|
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i915_gem_context_set_closed(ctx); /* not user accessible */
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i915_gem_context_clear_bannable(ctx);
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i915_gem_context_set_force_single_submission(ctx);
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if (!USES_GUC_SUBMISSION(to_i915(dev)))
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ctx->ring_size = 512 * PAGE_SIZE; /* Max ring buffer size */
|
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|
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GEM_BUG_ON(i915_gem_context_is_kernel(ctx));
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out:
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mutex_unlock(&dev->struct_mutex);
|
|
return ctx;
|
|
}
|
|
|
|
static void
|
|
destroy_kernel_context(struct i915_gem_context **ctxp)
|
|
{
|
|
struct i915_gem_context *ctx;
|
|
|
|
/* Keep the context ref so that we can free it immediately ourselves */
|
|
ctx = i915_gem_context_get(fetch_and_zero(ctxp));
|
|
GEM_BUG_ON(!i915_gem_context_is_kernel(ctx));
|
|
|
|
context_close(ctx);
|
|
i915_gem_context_free(ctx);
|
|
}
|
|
|
|
struct i915_gem_context *
|
|
i915_gem_context_create_kernel(struct drm_i915_private *i915, int prio)
|
|
{
|
|
struct i915_gem_context *ctx;
|
|
int err;
|
|
|
|
ctx = i915_gem_create_context(i915, NULL);
|
|
if (IS_ERR(ctx))
|
|
return ctx;
|
|
|
|
err = i915_gem_context_pin_hw_id(ctx);
|
|
if (err) {
|
|
destroy_kernel_context(&ctx);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
i915_gem_context_clear_bannable(ctx);
|
|
ctx->sched.priority = prio;
|
|
ctx->ring_size = PAGE_SIZE;
|
|
|
|
GEM_BUG_ON(!i915_gem_context_is_kernel(ctx));
|
|
|
|
return ctx;
|
|
}
|
|
|
|
static void init_contexts(struct drm_i915_private *i915)
|
|
{
|
|
mutex_init(&i915->contexts.mutex);
|
|
INIT_LIST_HEAD(&i915->contexts.list);
|
|
|
|
/* Using the simple ida interface, the max is limited by sizeof(int) */
|
|
BUILD_BUG_ON(MAX_CONTEXT_HW_ID > INT_MAX);
|
|
BUILD_BUG_ON(GEN11_MAX_CONTEXT_HW_ID > INT_MAX);
|
|
ida_init(&i915->contexts.hw_ida);
|
|
INIT_LIST_HEAD(&i915->contexts.hw_id_list);
|
|
|
|
INIT_WORK(&i915->contexts.free_work, contexts_free_worker);
|
|
init_llist_head(&i915->contexts.free_list);
|
|
}
|
|
|
|
static bool needs_preempt_context(struct drm_i915_private *i915)
|
|
{
|
|
return HAS_LOGICAL_RING_PREEMPTION(i915);
|
|
}
|
|
|
|
int i915_gem_contexts_init(struct drm_i915_private *dev_priv)
|
|
{
|
|
struct i915_gem_context *ctx;
|
|
int ret;
|
|
|
|
/* Reassure ourselves we are only called once */
|
|
GEM_BUG_ON(dev_priv->kernel_context);
|
|
GEM_BUG_ON(dev_priv->preempt_context);
|
|
|
|
ret = intel_ctx_workarounds_init(dev_priv);
|
|
if (ret)
|
|
return ret;
|
|
|
|
init_contexts(dev_priv);
|
|
|
|
/* lowest priority; idle task */
|
|
ctx = i915_gem_context_create_kernel(dev_priv, I915_PRIORITY_MIN);
|
|
if (IS_ERR(ctx)) {
|
|
DRM_ERROR("Failed to create default global context\n");
|
|
return PTR_ERR(ctx);
|
|
}
|
|
/*
|
|
* For easy recognisablity, we want the kernel context to be 0 and then
|
|
* all user contexts will have non-zero hw_id. Kernel contexts are
|
|
* permanently pinned, so that we never suffer a stall and can
|
|
* use them from any allocation context (e.g. for evicting other
|
|
* contexts and from inside the shrinker).
|
|
*/
|
|
GEM_BUG_ON(ctx->hw_id);
|
|
GEM_BUG_ON(!atomic_read(&ctx->hw_id_pin_count));
|
|
dev_priv->kernel_context = ctx;
|
|
|
|
/* highest priority; preempting task */
|
|
if (needs_preempt_context(dev_priv)) {
|
|
ctx = i915_gem_context_create_kernel(dev_priv, INT_MAX);
|
|
if (!IS_ERR(ctx))
|
|
dev_priv->preempt_context = ctx;
|
|
else
|
|
DRM_ERROR("Failed to create preempt context; disabling preemption\n");
|
|
}
|
|
|
|
DRM_DEBUG_DRIVER("%s context support initialized\n",
|
|
DRIVER_CAPS(dev_priv)->has_logical_contexts ?
|
|
"logical" : "fake");
|
|
return 0;
|
|
}
|
|
|
|
void i915_gem_contexts_lost(struct drm_i915_private *dev_priv)
|
|
{
|
|
struct intel_engine_cs *engine;
|
|
enum intel_engine_id id;
|
|
|
|
lockdep_assert_held(&dev_priv->drm.struct_mutex);
|
|
|
|
for_each_engine(engine, dev_priv, id)
|
|
intel_engine_lost_context(engine);
|
|
}
|
|
|
|
void i915_gem_contexts_fini(struct drm_i915_private *i915)
|
|
{
|
|
lockdep_assert_held(&i915->drm.struct_mutex);
|
|
|
|
if (i915->preempt_context)
|
|
destroy_kernel_context(&i915->preempt_context);
|
|
destroy_kernel_context(&i915->kernel_context);
|
|
|
|
/* Must free all deferred contexts (via flush_workqueue) first */
|
|
GEM_BUG_ON(!list_empty(&i915->contexts.hw_id_list));
|
|
ida_destroy(&i915->contexts.hw_ida);
|
|
}
|
|
|
|
static int context_idr_cleanup(int id, void *p, void *data)
|
|
{
|
|
struct i915_gem_context *ctx = p;
|
|
|
|
context_close(ctx);
|
|
return 0;
|
|
}
|
|
|
|
int i915_gem_context_open(struct drm_i915_private *i915,
|
|
struct drm_file *file)
|
|
{
|
|
struct drm_i915_file_private *file_priv = file->driver_priv;
|
|
struct i915_gem_context *ctx;
|
|
|
|
idr_init(&file_priv->context_idr);
|
|
|
|
mutex_lock(&i915->drm.struct_mutex);
|
|
ctx = i915_gem_create_context(i915, file_priv);
|
|
mutex_unlock(&i915->drm.struct_mutex);
|
|
if (IS_ERR(ctx)) {
|
|
idr_destroy(&file_priv->context_idr);
|
|
return PTR_ERR(ctx);
|
|
}
|
|
|
|
GEM_BUG_ON(i915_gem_context_is_kernel(ctx));
|
|
|
|
return 0;
|
|
}
|
|
|
|
void i915_gem_context_close(struct drm_file *file)
|
|
{
|
|
struct drm_i915_file_private *file_priv = file->driver_priv;
|
|
|
|
lockdep_assert_held(&file_priv->dev_priv->drm.struct_mutex);
|
|
|
|
idr_for_each(&file_priv->context_idr, context_idr_cleanup, NULL);
|
|
idr_destroy(&file_priv->context_idr);
|
|
}
|
|
|
|
static struct i915_request *
|
|
last_request_on_engine(struct i915_timeline *timeline,
|
|
struct intel_engine_cs *engine)
|
|
{
|
|
struct i915_request *rq;
|
|
|
|
GEM_BUG_ON(timeline == &engine->timeline);
|
|
|
|
rq = i915_gem_active_raw(&timeline->last_request,
|
|
&engine->i915->drm.struct_mutex);
|
|
if (rq && rq->engine == engine) {
|
|
GEM_TRACE("last request for %s on engine %s: %llx:%d\n",
|
|
timeline->name, engine->name,
|
|
rq->fence.context, rq->fence.seqno);
|
|
GEM_BUG_ON(rq->timeline != timeline);
|
|
return rq;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static bool engine_has_kernel_context_barrier(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *i915 = engine->i915;
|
|
const struct intel_context * const ce =
|
|
to_intel_context(i915->kernel_context, engine);
|
|
struct i915_timeline *barrier = ce->ring->timeline;
|
|
struct intel_ring *ring;
|
|
bool any_active = false;
|
|
|
|
lockdep_assert_held(&i915->drm.struct_mutex);
|
|
list_for_each_entry(ring, &i915->gt.active_rings, active_link) {
|
|
struct i915_request *rq;
|
|
|
|
rq = last_request_on_engine(ring->timeline, engine);
|
|
if (!rq)
|
|
continue;
|
|
|
|
any_active = true;
|
|
|
|
if (rq->hw_context == ce)
|
|
continue;
|
|
|
|
/*
|
|
* Was this request submitted after the previous
|
|
* switch-to-kernel-context?
|
|
*/
|
|
if (!i915_timeline_sync_is_later(barrier, &rq->fence)) {
|
|
GEM_TRACE("%s needs barrier for %llx:%d\n",
|
|
ring->timeline->name,
|
|
rq->fence.context,
|
|
rq->fence.seqno);
|
|
return false;
|
|
}
|
|
|
|
GEM_TRACE("%s has barrier after %llx:%d\n",
|
|
ring->timeline->name,
|
|
rq->fence.context,
|
|
rq->fence.seqno);
|
|
}
|
|
|
|
/*
|
|
* If any other timeline was still active and behind the last barrier,
|
|
* then our last switch-to-kernel-context must still be queued and
|
|
* will run last (leaving the engine in the kernel context when it
|
|
* eventually idles).
|
|
*/
|
|
if (any_active)
|
|
return true;
|
|
|
|
/* The engine is idle; check that it is idling in the kernel context. */
|
|
return engine->last_retired_context == ce;
|
|
}
|
|
|
|
int i915_gem_switch_to_kernel_context(struct drm_i915_private *i915)
|
|
{
|
|
struct intel_engine_cs *engine;
|
|
enum intel_engine_id id;
|
|
|
|
GEM_TRACE("awake?=%s\n", yesno(i915->gt.awake));
|
|
|
|
lockdep_assert_held(&i915->drm.struct_mutex);
|
|
GEM_BUG_ON(!i915->kernel_context);
|
|
|
|
i915_retire_requests(i915);
|
|
|
|
for_each_engine(engine, i915, id) {
|
|
struct intel_ring *ring;
|
|
struct i915_request *rq;
|
|
|
|
GEM_BUG_ON(!to_intel_context(i915->kernel_context, engine));
|
|
if (engine_has_kernel_context_barrier(engine))
|
|
continue;
|
|
|
|
GEM_TRACE("emit barrier on %s\n", engine->name);
|
|
|
|
rq = i915_request_alloc(engine, i915->kernel_context);
|
|
if (IS_ERR(rq))
|
|
return PTR_ERR(rq);
|
|
|
|
/* Queue this switch after all other activity */
|
|
list_for_each_entry(ring, &i915->gt.active_rings, active_link) {
|
|
struct i915_request *prev;
|
|
|
|
prev = last_request_on_engine(ring->timeline, engine);
|
|
if (!prev)
|
|
continue;
|
|
|
|
if (prev->gem_context == i915->kernel_context)
|
|
continue;
|
|
|
|
GEM_TRACE("add barrier on %s for %llx:%d\n",
|
|
engine->name,
|
|
prev->fence.context,
|
|
prev->fence.seqno);
|
|
i915_sw_fence_await_sw_fence_gfp(&rq->submit,
|
|
&prev->submit,
|
|
I915_FENCE_GFP);
|
|
i915_timeline_sync_set(rq->timeline, &prev->fence);
|
|
}
|
|
|
|
i915_request_add(rq);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool client_is_banned(struct drm_i915_file_private *file_priv)
|
|
{
|
|
return atomic_read(&file_priv->ban_score) >= I915_CLIENT_SCORE_BANNED;
|
|
}
|
|
|
|
int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file)
|
|
{
|
|
struct drm_i915_private *dev_priv = to_i915(dev);
|
|
struct drm_i915_gem_context_create *args = data;
|
|
struct drm_i915_file_private *file_priv = file->driver_priv;
|
|
struct i915_gem_context *ctx;
|
|
int ret;
|
|
|
|
if (!DRIVER_CAPS(dev_priv)->has_logical_contexts)
|
|
return -ENODEV;
|
|
|
|
if (args->pad != 0)
|
|
return -EINVAL;
|
|
|
|
if (client_is_banned(file_priv)) {
|
|
DRM_DEBUG("client %s[%d] banned from creating ctx\n",
|
|
current->comm,
|
|
pid_nr(get_task_pid(current, PIDTYPE_PID)));
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
ret = i915_mutex_lock_interruptible(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ctx = i915_gem_create_context(dev_priv, file_priv);
|
|
mutex_unlock(&dev->struct_mutex);
|
|
if (IS_ERR(ctx))
|
|
return PTR_ERR(ctx);
|
|
|
|
GEM_BUG_ON(i915_gem_context_is_kernel(ctx));
|
|
|
|
args->ctx_id = ctx->user_handle;
|
|
DRM_DEBUG("HW context %d created\n", args->ctx_id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file)
|
|
{
|
|
struct drm_i915_gem_context_destroy *args = data;
|
|
struct drm_i915_file_private *file_priv = file->driver_priv;
|
|
struct i915_gem_context *ctx;
|
|
int ret;
|
|
|
|
if (args->pad != 0)
|
|
return -EINVAL;
|
|
|
|
if (args->ctx_id == DEFAULT_CONTEXT_HANDLE)
|
|
return -ENOENT;
|
|
|
|
ctx = i915_gem_context_lookup(file_priv, args->ctx_id);
|
|
if (!ctx)
|
|
return -ENOENT;
|
|
|
|
ret = mutex_lock_interruptible(&dev->struct_mutex);
|
|
if (ret)
|
|
goto out;
|
|
|
|
__destroy_hw_context(ctx, file_priv);
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
out:
|
|
i915_gem_context_put(ctx);
|
|
return 0;
|
|
}
|
|
|
|
int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file)
|
|
{
|
|
struct drm_i915_file_private *file_priv = file->driver_priv;
|
|
struct drm_i915_gem_context_param *args = data;
|
|
struct i915_gem_context *ctx;
|
|
int ret = 0;
|
|
|
|
ctx = i915_gem_context_lookup(file_priv, args->ctx_id);
|
|
if (!ctx)
|
|
return -ENOENT;
|
|
|
|
args->size = 0;
|
|
switch (args->param) {
|
|
case I915_CONTEXT_PARAM_BAN_PERIOD:
|
|
ret = -EINVAL;
|
|
break;
|
|
case I915_CONTEXT_PARAM_NO_ZEROMAP:
|
|
args->value = test_bit(UCONTEXT_NO_ZEROMAP, &ctx->user_flags);
|
|
break;
|
|
case I915_CONTEXT_PARAM_GTT_SIZE:
|
|
if (ctx->ppgtt)
|
|
args->value = ctx->ppgtt->vm.total;
|
|
else if (to_i915(dev)->mm.aliasing_ppgtt)
|
|
args->value = to_i915(dev)->mm.aliasing_ppgtt->vm.total;
|
|
else
|
|
args->value = to_i915(dev)->ggtt.vm.total;
|
|
break;
|
|
case I915_CONTEXT_PARAM_NO_ERROR_CAPTURE:
|
|
args->value = i915_gem_context_no_error_capture(ctx);
|
|
break;
|
|
case I915_CONTEXT_PARAM_BANNABLE:
|
|
args->value = i915_gem_context_is_bannable(ctx);
|
|
break;
|
|
case I915_CONTEXT_PARAM_PRIORITY:
|
|
args->value = ctx->sched.priority;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
i915_gem_context_put(ctx);
|
|
return ret;
|
|
}
|
|
|
|
int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file)
|
|
{
|
|
struct drm_i915_file_private *file_priv = file->driver_priv;
|
|
struct drm_i915_gem_context_param *args = data;
|
|
struct i915_gem_context *ctx;
|
|
int ret = 0;
|
|
|
|
ctx = i915_gem_context_lookup(file_priv, args->ctx_id);
|
|
if (!ctx)
|
|
return -ENOENT;
|
|
|
|
switch (args->param) {
|
|
case I915_CONTEXT_PARAM_BAN_PERIOD:
|
|
ret = -EINVAL;
|
|
break;
|
|
case I915_CONTEXT_PARAM_NO_ZEROMAP:
|
|
if (args->size)
|
|
ret = -EINVAL;
|
|
else if (args->value)
|
|
set_bit(UCONTEXT_NO_ZEROMAP, &ctx->user_flags);
|
|
else
|
|
clear_bit(UCONTEXT_NO_ZEROMAP, &ctx->user_flags);
|
|
break;
|
|
case I915_CONTEXT_PARAM_NO_ERROR_CAPTURE:
|
|
if (args->size)
|
|
ret = -EINVAL;
|
|
else if (args->value)
|
|
i915_gem_context_set_no_error_capture(ctx);
|
|
else
|
|
i915_gem_context_clear_no_error_capture(ctx);
|
|
break;
|
|
case I915_CONTEXT_PARAM_BANNABLE:
|
|
if (args->size)
|
|
ret = -EINVAL;
|
|
else if (!capable(CAP_SYS_ADMIN) && !args->value)
|
|
ret = -EPERM;
|
|
else if (args->value)
|
|
i915_gem_context_set_bannable(ctx);
|
|
else
|
|
i915_gem_context_clear_bannable(ctx);
|
|
break;
|
|
|
|
case I915_CONTEXT_PARAM_PRIORITY:
|
|
{
|
|
s64 priority = args->value;
|
|
|
|
if (args->size)
|
|
ret = -EINVAL;
|
|
else if (!(to_i915(dev)->caps.scheduler & I915_SCHEDULER_CAP_PRIORITY))
|
|
ret = -ENODEV;
|
|
else if (priority > I915_CONTEXT_MAX_USER_PRIORITY ||
|
|
priority < I915_CONTEXT_MIN_USER_PRIORITY)
|
|
ret = -EINVAL;
|
|
else if (priority > I915_CONTEXT_DEFAULT_PRIORITY &&
|
|
!capable(CAP_SYS_NICE))
|
|
ret = -EPERM;
|
|
else
|
|
ctx->sched.priority = priority;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
i915_gem_context_put(ctx);
|
|
return ret;
|
|
}
|
|
|
|
int i915_gem_context_reset_stats_ioctl(struct drm_device *dev,
|
|
void *data, struct drm_file *file)
|
|
{
|
|
struct drm_i915_private *dev_priv = to_i915(dev);
|
|
struct drm_i915_reset_stats *args = data;
|
|
struct i915_gem_context *ctx;
|
|
int ret;
|
|
|
|
if (args->flags || args->pad)
|
|
return -EINVAL;
|
|
|
|
ret = -ENOENT;
|
|
rcu_read_lock();
|
|
ctx = __i915_gem_context_lookup_rcu(file->driver_priv, args->ctx_id);
|
|
if (!ctx)
|
|
goto out;
|
|
|
|
/*
|
|
* We opt for unserialised reads here. This may result in tearing
|
|
* in the extremely unlikely event of a GPU hang on this context
|
|
* as we are querying them. If we need that extra layer of protection,
|
|
* we should wrap the hangstats with a seqlock.
|
|
*/
|
|
|
|
if (capable(CAP_SYS_ADMIN))
|
|
args->reset_count = i915_reset_count(&dev_priv->gpu_error);
|
|
else
|
|
args->reset_count = 0;
|
|
|
|
args->batch_active = atomic_read(&ctx->guilty_count);
|
|
args->batch_pending = atomic_read(&ctx->active_count);
|
|
|
|
ret = 0;
|
|
out:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
int __i915_gem_context_pin_hw_id(struct i915_gem_context *ctx)
|
|
{
|
|
struct drm_i915_private *i915 = ctx->i915;
|
|
int err = 0;
|
|
|
|
mutex_lock(&i915->contexts.mutex);
|
|
|
|
GEM_BUG_ON(i915_gem_context_is_closed(ctx));
|
|
|
|
if (list_empty(&ctx->hw_id_link)) {
|
|
GEM_BUG_ON(atomic_read(&ctx->hw_id_pin_count));
|
|
|
|
err = assign_hw_id(i915, &ctx->hw_id);
|
|
if (err)
|
|
goto out_unlock;
|
|
|
|
list_add_tail(&ctx->hw_id_link, &i915->contexts.hw_id_list);
|
|
}
|
|
|
|
GEM_BUG_ON(atomic_read(&ctx->hw_id_pin_count) == ~0u);
|
|
atomic_inc(&ctx->hw_id_pin_count);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&i915->contexts.mutex);
|
|
return err;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
|
|
#include "selftests/mock_context.c"
|
|
#include "selftests/i915_gem_context.c"
|
|
#endif
|