// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2019 Intel Corporation
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*/
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#include "i915_active.h"
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#include "intel_context.h"
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#include "intel_context_param.h"
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#include "intel_ring.h"
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int intel_context_set_ring_size(struct intel_context *ce, long sz)
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{
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int err;
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if (intel_context_lock_pinned(ce))
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return -EINTR;
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err = i915_active_wait(&ce->active);
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if (err < 0)
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goto unlock;
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if (intel_context_is_pinned(ce)) {
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err = -EBUSY; /* In active use, come back later! */
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goto unlock;
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}
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if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
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struct intel_ring *ring;
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/* Replace the existing ringbuffer */
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ring = intel_engine_create_ring(ce->engine, sz);
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if (IS_ERR(ring)) {
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err = PTR_ERR(ring);
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goto unlock;
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}
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intel_ring_put(ce->ring);
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ce->ring = ring;
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/* Context image will be updated on next pin */
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} else {
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ce->ring = __intel_context_ring_size(sz);
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}
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unlock:
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intel_context_unlock_pinned(ce);
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return err;
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}
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long intel_context_get_ring_size(struct intel_context *ce)
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{
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long sz = (unsigned long)READ_ONCE(ce->ring);
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if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
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if (intel_context_lock_pinned(ce))
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return -EINTR;
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sz = ce->ring->size;
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intel_context_unlock_pinned(ce);
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}
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return sz;
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}
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