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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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288f1ced5e
Future gen reduce the number of bits we will have available to differentiate between contexts, so reduce the lifetime of the ID assignment from that of the context to its current active cycle (i.e. only while it is pinned for use by the HW, will it have a constant ID). This means that instead of a max of 2k allocated contexts (worst case before fun with bit twiddling), we instead have a limit of 2k in flight contexts (minus a few that have been pinned by the kernel or by perf). To reduce the number of contexts id we require, we allocate a context id on first and mark it as pinned for as long as the GEM context itself is, that is we keep it pinned it while active on each engine. If we exhaust our context id space, then we try to reclaim an id from an idle context. In the extreme case where all context ids are pinned by active contexts, we force the system to idle in order to recover ids. We cannot reduce the scope of an HW-ID to an engine (allowing the same gem_context to have different ids on each engine) as in the future we will need to preassign an id before we know which engine the context is being executed on. v2: Improved commentary (Tvrtko) [I tried at least] References: https://bugs.freedesktop.org/show_bug.cgi?id=107788 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Cc: Michel Thierry <michel.thierry@intel.com> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180904153117.3907-1-chris@chris-wilson.co.uk
108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/*
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* Copyright © 2016 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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*/
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#include "mock_context.h"
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#include "mock_gtt.h"
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struct i915_gem_context *
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mock_context(struct drm_i915_private *i915,
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const char *name)
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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)
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return NULL;
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kref_init(&ctx->ref);
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INIT_LIST_HEAD(&ctx->link);
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ctx->i915 = i915;
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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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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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ret = i915_gem_context_pin_hw_id(ctx);
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if (ret < 0)
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goto err_handles;
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if (name) {
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ctx->name = kstrdup(name, GFP_KERNEL);
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if (!ctx->name)
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goto err_put;
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ctx->ppgtt = mock_ppgtt(i915, name);
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if (!ctx->ppgtt)
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goto err_put;
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}
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return ctx;
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err_handles:
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kfree(ctx);
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return NULL;
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err_put:
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i915_gem_context_set_closed(ctx);
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i915_gem_context_put(ctx);
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return NULL;
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}
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void mock_context_close(struct i915_gem_context *ctx)
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{
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context_close(ctx);
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}
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void mock_init_contexts(struct drm_i915_private *i915)
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{
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init_contexts(i915);
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}
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struct i915_gem_context *
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live_context(struct drm_i915_private *i915, struct drm_file *file)
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{
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lockdep_assert_held(&i915->drm.struct_mutex);
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return i915_gem_create_context(i915, file->driver_priv);
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}
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struct i915_gem_context *
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kernel_context(struct drm_i915_private *i915)
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{
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return i915_gem_context_create_kernel(i915, I915_PRIORITY_NORMAL);
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}
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void kernel_context_close(struct i915_gem_context *ctx)
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{
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context_close(ctx);
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}
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