diff options
author | Jason Ekstrand <jason@jlekstrand.net> | 2021-07-08 10:48:06 -0500 |
---|---|---|
committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2021-07-08 19:43:27 +0200 |
commit | fe4751c3d513ff4f5422dbf55a966abafe39255e (patch) | |
tree | ccc5c26ab080163aab834ab0cfe2b9633d441427 /drivers/gpu | |
parent | 520dfc807d315bc33f0c80a518973791f31dfbd6 (diff) |
drm/i915: Drop I915_CONTEXT_PARAM_RINGSIZE
This reverts commit 88be76cdafc7 ("drm/i915: Allow userspace to specify
ringsize on construction"). This API was originally added for OpenCL
but the compute-runtime PR has sat open for a year without action so we
can still pull it out if we want. I argue we should drop it for three
reasons:
1. If the compute-runtime PR has sat open for a year, this clearly
isn't that important.
2. It's a very leaky API. Ring size is an implementation detail of the
current execlist scheduler and really only makes sense there. It
can't apply to the older ring-buffer scheduler on pre-execlist
hardware because that's shared across all contexts and it won't
apply to the GuC scheduler that's in the pipeline.
3. Having userspace set a ring size in bytes is a bad solution to the
problem of having too small a ring. There is no way that userspace
has the information to know how to properly set the ring size so
it's just going to detect the feature and always set it to the
maximum of 512K. This is what the compute-runtime PR does. The
scheduler in i915, on the other hand, does have the information to
make an informed choice. It could detect if the ring size is a
problem and grow it itself. Or, if that's too hard, we could just
increase the default size from 16K to 32K or even 64K instead of
relying on userspace to do it.
Let's drop this API for now and, if someone decides they really care
about solving this problem, they can do it properly.
Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210708154835.528166-2-jason@jlekstrand.net
Diffstat (limited to 'drivers/gpu')
-rw-r--r-- | drivers/gpu/drm/i915/Makefile | 1 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_context.c | 85 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gt/intel_context_param.c | 63 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gt/intel_context_param.h | 3 |
4 files changed, 2 insertions, 150 deletions
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 01f28ad5ea57..10b3bb6207ba 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -89,7 +89,6 @@ gt-y += \ gt/gen8_ppgtt.o \ gt/intel_breadcrumbs.o \ gt/intel_context.o \ - gt/intel_context_param.o \ gt/intel_context_sseu.o \ gt/intel_engine_cs.o \ gt/intel_engine_heartbeat.o \ diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index 7720b8c22c81..ddc3cc3f8f09 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -1334,63 +1334,6 @@ out: return err; } -static int __apply_ringsize(struct intel_context *ce, void *sz) -{ - return intel_context_set_ring_size(ce, (unsigned long)sz); -} - -static int set_ringsize(struct i915_gem_context *ctx, - struct drm_i915_gem_context_param *args) -{ - if (!HAS_LOGICAL_RING_CONTEXTS(ctx->i915)) - return -ENODEV; - - if (args->size) - return -EINVAL; - - if (!IS_ALIGNED(args->value, I915_GTT_PAGE_SIZE)) - return -EINVAL; - - if (args->value < I915_GTT_PAGE_SIZE) - return -EINVAL; - - if (args->value > 128 * I915_GTT_PAGE_SIZE) - return -EINVAL; - - return context_apply_all(ctx, - __apply_ringsize, - __intel_context_ring_size(args->value)); -} - -static int __get_ringsize(struct intel_context *ce, void *arg) -{ - long sz; - - sz = intel_context_get_ring_size(ce); - GEM_BUG_ON(sz > INT_MAX); - - return sz; /* stop on first engine */ -} - -static int get_ringsize(struct i915_gem_context *ctx, - struct drm_i915_gem_context_param *args) -{ - int sz; - - if (!HAS_LOGICAL_RING_CONTEXTS(ctx->i915)) - return -ENODEV; - - if (args->size) - return -EINVAL; - - sz = context_apply_all(ctx, __get_ringsize, NULL); - if (sz < 0) - return sz; - - args->value = sz; - return 0; -} - int i915_gem_user_to_context_sseu(struct intel_gt *gt, const struct drm_i915_gem_context_param_sseu *user, @@ -2036,11 +1979,8 @@ static int ctx_setparam(struct drm_i915_file_private *fpriv, ret = set_persistence(ctx, args); break; - case I915_CONTEXT_PARAM_RINGSIZE: - ret = set_ringsize(ctx, args); - break; - case I915_CONTEXT_PARAM_BAN_PERIOD: + case I915_CONTEXT_PARAM_RINGSIZE: default: ret = -EINVAL; break; @@ -2068,18 +2008,6 @@ static int create_setparam(struct i915_user_extension __user *ext, void *data) return ctx_setparam(arg->fpriv, arg->ctx, &local.param); } -static int copy_ring_size(struct intel_context *dst, - struct intel_context *src) -{ - long sz; - - sz = intel_context_get_ring_size(src); - if (sz < 0) - return sz; - - return intel_context_set_ring_size(dst, sz); -} - static int clone_engines(struct i915_gem_context *dst, struct i915_gem_context *src) { @@ -2124,12 +2052,6 @@ static int clone_engines(struct i915_gem_context *dst, } intel_context_set_gem(clone->engines[n], dst); - - /* Copy across the preferred ringsize */ - if (copy_ring_size(clone->engines[n], e->engines[n])) { - __free_engines(clone, n + 1); - goto err_unlock; - } } clone->num_engines = n; i915_sw_fence_complete(&e->fence); @@ -2489,11 +2411,8 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data, args->value = i915_gem_context_is_persistent(ctx); break; - case I915_CONTEXT_PARAM_RINGSIZE: - ret = get_ringsize(ctx, args); - break; - case I915_CONTEXT_PARAM_BAN_PERIOD: + case I915_CONTEXT_PARAM_RINGSIZE: default: ret = -EINVAL; break; diff --git a/drivers/gpu/drm/i915/gt/intel_context_param.c b/drivers/gpu/drm/i915/gt/intel_context_param.c deleted file mode 100644 index 65dcd090245d..000000000000 --- a/drivers/gpu/drm/i915/gt/intel_context_param.c +++ /dev/null @@ -1,63 +0,0 @@ -// SPDX-License-Identifier: MIT -/* - * Copyright © 2019 Intel Corporation - */ - -#include "i915_active.h" -#include "intel_context.h" -#include "intel_context_param.h" -#include "intel_ring.h" - -int intel_context_set_ring_size(struct intel_context *ce, long sz) -{ - int err; - - if (intel_context_lock_pinned(ce)) - return -EINTR; - - err = i915_active_wait(&ce->active); - if (err < 0) - goto unlock; - - if (intel_context_is_pinned(ce)) { - err = -EBUSY; /* In active use, come back later! */ - goto unlock; - } - - if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) { - struct intel_ring *ring; - - /* Replace the existing ringbuffer */ - ring = intel_engine_create_ring(ce->engine, sz); - if (IS_ERR(ring)) { - err = PTR_ERR(ring); - goto unlock; - } - - intel_ring_put(ce->ring); - ce->ring = ring; - - /* Context image will be updated on next pin */ - } else { - ce->ring = __intel_context_ring_size(sz); - } - -unlock: - intel_context_unlock_pinned(ce); - return err; -} - -long intel_context_get_ring_size(struct intel_context *ce) -{ - long sz = (unsigned long)READ_ONCE(ce->ring); - - if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) { - if (intel_context_lock_pinned(ce)) - return -EINTR; - - sz = ce->ring->size; - intel_context_unlock_pinned(ce); - } - - return sz; -} diff --git a/drivers/gpu/drm/i915/gt/intel_context_param.h b/drivers/gpu/drm/i915/gt/intel_context_param.h index 3ecacc675f41..dffedd983693 100644 --- a/drivers/gpu/drm/i915/gt/intel_context_param.h +++ b/drivers/gpu/drm/i915/gt/intel_context_param.h @@ -10,9 +10,6 @@ #include "intel_context.h" -int intel_context_set_ring_size(struct intel_context *ce, long sz); -long intel_context_get_ring_size(struct intel_context *ce); - static inline int intel_context_set_watchdog_us(struct intel_context *ce, u64 timeout_us) { |