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
gen8_emit_rpcs_config(struct i915_request * rq,const struct intel_context * ce,const struct intel_sseu sseu)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
gen8_modify_rpcs(struct intel_context * ce,const struct intel_sseu sseu)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
intel_context_reconfigure_sseu(struct intel_context * ce,const struct intel_sseu sseu)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 }
97