intel_context_sseu.c revision 1.3 
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_ring.h"
13#include "intel_sseu.h"
14
15static int gen8_emit_rpcs_config(struct i915_request *rq,
16				 const struct intel_context *ce,
17				 const struct intel_sseu sseu)
18{
19	u64 offset;
20	u32 *cs;
21
22	cs = intel_ring_begin(rq, 4);
23	if (IS_ERR(cs))
24		return PTR_ERR(cs);
25
26	offset = i915_ggtt_offset(ce->state) +
27		 LRC_STATE_OFFSET + CTX_R_PWR_CLK_STATE * 4;
28
29	*cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
30	*cs++ = lower_32_bits(offset);
31	*cs++ = upper_32_bits(offset);
32	*cs++ = intel_sseu_make_rpcs(rq->engine->gt, &sseu);
33
34	intel_ring_advance(rq, cs);
35
36	return 0;
37}
38
39static int
40gen8_modify_rpcs(struct intel_context *ce, const struct intel_sseu sseu)
41{
42	struct i915_request *rq;
43	int ret;
44
45	lockdep_assert_held(&ce->pin_mutex);
46
47	/*
48	 * If the context is not idle, we have to submit an ordered request to
49	 * modify its context image via the kernel context (writing to our own
50	 * image, or into the registers directory, does not stick). Pristine
51	 * and idle contexts will be configured on pinning.
52	 */
53	if (!intel_context_pin_if_active(ce))
54		return 0;
55
56	rq = intel_engine_create_kernel_request(ce->engine);
57	if (IS_ERR(rq)) {
58		ret = PTR_ERR(rq);
59		goto out_unpin;
60	}
61
62	/* Serialise with the remote context */
63	ret = intel_context_prepare_remote_request(ce, rq);
64	if (ret == 0)
65		ret = gen8_emit_rpcs_config(rq, ce, sseu);
66
67	i915_request_add(rq);
68out_unpin:
69	intel_context_unpin(ce);
70	return ret;
71}
72
73int
74intel_context_reconfigure_sseu(struct intel_context *ce,
75			       const struct intel_sseu sseu)
76{
77	int ret;
78
79	GEM_BUG_ON(GRAPHICS_VER(ce->engine->i915) < 8);
80
81	ret = intel_context_lock_pinned(ce);
82	if (ret)
83		return ret;
84
85	/* Nothing to do if unmodified. */
86	if (!memcmp(&ce->sseu, &sseu, sizeof(sseu)))
87		goto unlock;
88
89	ret = gen8_modify_rpcs(ce, sseu);
90	if (!ret)
91		ce->sseu = sseu;
92
93unlock:
94	intel_context_unlock_pinned(ce);
95	return ret;
96}
97