1// SPDX-License-Identifier: MIT
2/*
3 * Copyright �� 2019 Intel Corporation
4 */
5
6#include "i915_drv.h"
7#include "i915_vma.h"
8#include "intel_context.h"
9#include "intel_engine_pm.h"
10#include "intel_gpu_commands.h"
11#include "intel_lrc.h"
12#include "intel_lrc_reg.h"
13#include "intel_ring.h"
14#include "intel_sseu.h"
15
16static int gen8_emit_rpcs_config(struct i915_request *rq,
17				 const struct intel_context *ce,
18				 const struct intel_sseu sseu)
19{
20	u64 offset;
21	u32 *cs;
22
23	cs = intel_ring_begin(rq, 4);
24	if (IS_ERR(cs))
25		return PTR_ERR(cs);
26
27	offset = i915_ggtt_offset(ce->state) +
28		 LRC_STATE_OFFSET + CTX_R_PWR_CLK_STATE * 4;
29
30	*cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
31	*cs++ = lower_32_bits(offset);
32	*cs++ = upper_32_bits(offset);
33	*cs++ = intel_sseu_make_rpcs(rq->engine->gt, &sseu);
34
35	intel_ring_advance(rq, cs);
36
37	return 0;
38}
39
40static int
41gen8_modify_rpcs(struct intel_context *ce, const struct intel_sseu sseu)
42{
43	struct i915_request *rq;
44	int ret;
45
46	lockdep_assert_held(&ce->pin_mutex);
47
48	/*
49	 * If the context is not idle, we have to submit an ordered request to
50	 * modify its context image via the kernel context (writing to our own
51	 * image, or into the registers directory, does not stick). Pristine
52	 * and idle contexts will be configured on pinning.
53	 */
54	if (!intel_context_pin_if_active(ce))
55		return 0;
56
57	rq = intel_engine_create_kernel_request(ce->engine);
58	if (IS_ERR(rq)) {
59		ret = PTR_ERR(rq);
60		goto out_unpin;
61	}
62
63	/* Serialise with the remote context */
64	ret = intel_context_prepare_remote_request(ce, rq);
65	if (ret == 0)
66		ret = gen8_emit_rpcs_config(rq, ce, sseu);
67
68	i915_request_add(rq);
69out_unpin:
70	intel_context_unpin(ce);
71	return ret;
72}
73
74int
75intel_context_reconfigure_sseu(struct intel_context *ce,
76			       const struct intel_sseu sseu)
77{
78	int ret;
79
80	GEM_BUG_ON(GRAPHICS_VER(ce->engine->i915) < 8);
81
82	ret = intel_context_lock_pinned(ce);
83	if (ret)
84		return ret;
85
86	/* Nothing to do if unmodified. */
87	if (!memcmp(&ce->sseu, &sseu, sizeof(sseu)))
88		goto unlock;
89
90	ret = gen8_modify_rpcs(ce, sseu);
91	if (!ret)
92		ce->sseu = sseu;
93
94unlock:
95	intel_context_unlock_pinned(ce);
96	return ret;
97}
98