1// SPDX-License-Identifier: MIT
 2/*
 3 * Copyright © 2019 Intel Corporation
 4 */
 5
 6#include "i915_active.h"
 7#include "intel_context.h"
 8#include "intel_context_param.h"
 9#include "intel_ring.h"
10
11int intel_context_set_ring_size(struct intel_context *ce, long sz)
12{
13	int err;
14
15	if (intel_context_lock_pinned(ce))
16		return -EINTR;
17
18	err = i915_active_wait(&ce->active);
19	if (err < 0)
20		goto unlock;
21
22	if (intel_context_is_pinned(ce)) {
23		err = -EBUSY; /* In active use, come back later! */
24		goto unlock;
25	}
26
27	if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
28		struct intel_ring *ring;
29
30		/* Replace the existing ringbuffer */
31		ring = intel_engine_create_ring(ce->engine, sz);
32		if (IS_ERR(ring)) {
33			err = PTR_ERR(ring);
34			goto unlock;
35		}
36
37		intel_ring_put(ce->ring);
38		ce->ring = ring;
39
40		/* Context image will be updated on next pin */
41	} else {
42		ce->ring = __intel_context_ring_size(sz);
43	}
44
45unlock:
46	intel_context_unlock_pinned(ce);
47	return err;
48}
49
50long intel_context_get_ring_size(struct intel_context *ce)
51{
52	long sz = (unsigned long)READ_ONCE(ce->ring);
53
54	if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
55		if (intel_context_lock_pinned(ce))
56			return -EINTR;
57
58		sz = ce->ring->size;
59		intel_context_unlock_pinned(ce);
60	}
61
62	return sz;
63}