1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2022 Intel Corporation
4  */
5 
6 #include <linux/types.h>
7 
8 #include "gt/intel_gt.h"
9 #include "intel_gsc_uc.h"
10 #include "intel_gsc_fw.h"
11 #include "i915_drv.h"
12 
13 static void gsc_work(struct work_struct *work)
14 {
15 	struct intel_gsc_uc *gsc = container_of(work, typeof(*gsc), work);
16 	struct intel_gt *gt = gsc_uc_to_gt(gsc);
17 	intel_wakeref_t wakeref;
18 
19 	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
20 		intel_gsc_uc_fw_upload(gsc);
21 }
22 
23 static bool gsc_engine_supported(struct intel_gt *gt)
24 {
25 	intel_engine_mask_t mask;
26 
27 	/*
28 	 * We reach here from i915_driver_early_probe for the primary GT before
29 	 * its engine mask is set, so we use the device info engine mask for it.
30 	 * For other GTs we expect the GT-specific mask to be set before we
31 	 * call this function.
32 	 */
33 	GEM_BUG_ON(!gt_is_root(gt) && !gt->info.engine_mask);
34 
35 	if (gt_is_root(gt))
36 		mask = RUNTIME_INFO(gt->i915)->platform_engine_mask;
37 	else
38 		mask = gt->info.engine_mask;
39 
40 	return __HAS_ENGINE(mask, GSC0);
41 }
42 
43 void intel_gsc_uc_init_early(struct intel_gsc_uc *gsc)
44 {
45 	intel_uc_fw_init_early(&gsc->fw, INTEL_UC_FW_TYPE_GSC);
46 	INIT_WORK(&gsc->work, gsc_work);
47 
48 	/* we can arrive here from i915_driver_early_probe for primary
49 	 * GT with it being not fully setup hence check device info's
50 	 * engine mask
51 	 */
52 	if (!gsc_engine_supported(gsc_uc_to_gt(gsc))) {
53 		intel_uc_fw_change_status(&gsc->fw, INTEL_UC_FIRMWARE_NOT_SUPPORTED);
54 		return;
55 	}
56 }
57 
58 int intel_gsc_uc_init(struct intel_gsc_uc *gsc)
59 {
60 	static struct lock_class_key gsc_lock;
61 	struct intel_gt *gt = gsc_uc_to_gt(gsc);
62 	struct drm_i915_private *i915 = gt->i915;
63 	struct intel_engine_cs *engine = gt->engine[GSC0];
64 	struct intel_context *ce;
65 	struct i915_vma *vma;
66 	int err;
67 
68 	err = intel_uc_fw_init(&gsc->fw);
69 	if (err)
70 		goto out;
71 
72 	vma = intel_guc_allocate_vma(&gt->uc.guc, SZ_8M);
73 	if (IS_ERR(vma)) {
74 		err = PTR_ERR(vma);
75 		goto out_fw;
76 	}
77 
78 	gsc->local = vma;
79 
80 	ce = intel_engine_create_pinned_context(engine, engine->gt->vm, SZ_4K,
81 						I915_GEM_HWS_GSC_ADDR,
82 						&gsc_lock, "gsc_context");
83 	if (IS_ERR(ce)) {
84 		drm_err(&gt->i915->drm,
85 			"failed to create GSC CS ctx for FW communication\n");
86 		err =  PTR_ERR(ce);
87 		goto out_vma;
88 	}
89 
90 	gsc->ce = ce;
91 
92 	intel_uc_fw_change_status(&gsc->fw, INTEL_UC_FIRMWARE_LOADABLE);
93 
94 	return 0;
95 
96 out_vma:
97 	i915_vma_unpin_and_release(&gsc->local, 0);
98 out_fw:
99 	intel_uc_fw_fini(&gsc->fw);
100 out:
101 	i915_probe_error(i915, "failed with %d\n", err);
102 	return err;
103 }
104 
105 void intel_gsc_uc_fini(struct intel_gsc_uc *gsc)
106 {
107 	if (!intel_uc_fw_is_loadable(&gsc->fw))
108 		return;
109 
110 	flush_work(&gsc->work);
111 
112 	if (gsc->ce)
113 		intel_engine_destroy_pinned_context(fetch_and_zero(&gsc->ce));
114 
115 	i915_vma_unpin_and_release(&gsc->local, 0);
116 
117 	intel_uc_fw_fini(&gsc->fw);
118 }
119 
120 void intel_gsc_uc_suspend(struct intel_gsc_uc *gsc)
121 {
122 	if (!intel_uc_fw_is_loadable(&gsc->fw))
123 		return;
124 
125 	flush_work(&gsc->work);
126 }
127 
128 void intel_gsc_uc_load_start(struct intel_gsc_uc *gsc)
129 {
130 	if (!intel_uc_fw_is_loadable(&gsc->fw))
131 		return;
132 
133 	if (intel_gsc_uc_fw_init_done(gsc))
134 		return;
135 
136 	queue_work(system_unbound_wq, &gsc->work);
137 }
138