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, num_dwords: 4);
24 if (IS_ERR(ptr: cs))
25 return PTR_ERR(ptr: cs);
26
27 offset = i915_ggtt_offset(vma: 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(gt: rq->engine->gt, req_sseu: &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(engine: ce->engine);
58 if (IS_ERR(ptr: rq)) {
59 ret = PTR_ERR(ptr: 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