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// 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;
}
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