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[linux.git] / drivers / gpu / drm / i915 / gt / intel_context_sseu.c
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
15 static 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
39 static int
40 gen8_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);
68 out_unpin:
69         intel_context_unpin(ce);
70         return ret;
71 }
72
73 int
74 intel_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
93 unlock:
94         intel_context_unlock_pinned(ce);
95         return ret;
96 }
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