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Merge drm/drm-next into drm-intel-next-queued
[tomoyo/tomoyo-test1.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_lrc_reg.h"
13 #include "intel_ring.h"
14 #include "intel_sseu.h"
15
16 static 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_PN * PAGE_SIZE +
29                  CTX_R_PWR_CLK_STATE * 4;
30
31         *cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
32         *cs++ = lower_32_bits(offset);
33         *cs++ = upper_32_bits(offset);
34         *cs++ = intel_sseu_make_rpcs(rq->i915, &sseu);
35
36         intel_ring_advance(rq, cs);
37
38         return 0;
39 }
40
41 static int
42 gen8_modify_rpcs(struct intel_context *ce, const struct intel_sseu sseu)
43 {
44         struct i915_request *rq;
45         int ret;
46
47         lockdep_assert_held(&ce->pin_mutex);
48
49         /*
50          * If the context is not idle, we have to submit an ordered request to
51          * modify its context image via the kernel context (writing to our own
52          * image, or into the registers directory, does not stick). Pristine
53          * and idle contexts will be configured on pinning.
54          */
55         if (!intel_context_pin_if_active(ce))
56                 return 0;
57
58         rq = intel_engine_create_kernel_request(ce->engine);
59         if (IS_ERR(rq)) {
60                 ret = PTR_ERR(rq);
61                 goto out_unpin;
62         }
63
64         /* Serialise with the remote context */
65         ret = intel_context_prepare_remote_request(ce, rq);
66         if (ret == 0)
67                 ret = gen8_emit_rpcs_config(rq, ce, sseu);
68
69         i915_request_add(rq);
70 out_unpin:
71         intel_context_unpin(ce);
72         return ret;
73 }
74
75 int
76 intel_context_reconfigure_sseu(struct intel_context *ce,
77                                const struct intel_sseu sseu)
78 {
79         int ret;
80
81         GEM_BUG_ON(INTEL_GEN(ce->engine->i915) < 8);
82
83         ret = intel_context_lock_pinned(ce);
84         if (ret)
85                 return ret;
86
87         /* Nothing to do if unmodified. */
88         if (!memcmp(&ce->sseu, &sseu, sizeof(sseu)))
89                 goto unlock;
90
91         ret = gen8_modify_rpcs(ce, sseu);
92         if (!ret)
93                 ce->sseu = sseu;
94
95 unlock:
96         intel_context_unlock_pinned(ce);
97         return ret;
98 }