1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2021 Intel Corporation
4  */
5 
6 #include <linux/debugfs.h>
7 #include <linux/string_helpers.h>
8 
9 #include <drm/drm_print.h>
10 
11 #include "gt/intel_gt_debugfs.h"
12 
13 #include "i915_drv.h"
14 
15 #include "intel_pxp.h"
16 #include "intel_pxp_debugfs.h"
17 #include "intel_pxp_gsccs.h"
18 #include "intel_pxp_irq.h"
19 #include "intel_pxp_types.h"
20 
21 static int pxp_info_show(struct seq_file *m, void *data)
22 {
23 	struct intel_pxp *pxp = m->private;
24 	struct drm_printer p = drm_seq_file_printer(m);
25 
26 	if (!intel_pxp_is_enabled(pxp)) {
27 		drm_printf(&p, "pxp disabled\n");
28 		return 0;
29 	}
30 
31 	drm_printf(&p, "active: %s\n", str_yes_no(intel_pxp_is_active(pxp)));
32 	drm_printf(&p, "instance counter: %u\n", pxp->key_instance);
33 
34 	return 0;
35 }
36 
37 DEFINE_SHOW_ATTRIBUTE(pxp_info);
38 
39 static int pxp_terminate_get(void *data, u64 *val)
40 {
41 	/* nothing to read */
42 	return -EPERM;
43 }
44 
45 static int pxp_terminate_set(void *data, u64 val)
46 {
47 	struct intel_pxp *pxp = data;
48 	struct intel_gt *gt = pxp->ctrl_gt;
49 	int timeout_ms;
50 
51 	if (!intel_pxp_is_active(pxp))
52 		return -ENODEV;
53 
54 	/* simulate a termination interrupt */
55 	spin_lock_irq(gt->irq_lock);
56 	intel_pxp_irq_handler(pxp, GEN12_DISPLAY_PXP_STATE_TERMINATED_INTERRUPT);
57 	spin_unlock_irq(gt->irq_lock);
58 
59 	timeout_ms = intel_pxp_get_backend_timeout_ms(pxp);
60 
61 	if (!wait_for_completion_timeout(&pxp->termination,
62 					 msecs_to_jiffies(timeout_ms)))
63 		return -ETIMEDOUT;
64 
65 	return 0;
66 }
67 
68 DEFINE_SIMPLE_ATTRIBUTE(pxp_terminate_fops, pxp_terminate_get, pxp_terminate_set, "%llx\n");
69 
70 void intel_pxp_debugfs_register(struct intel_pxp *pxp)
71 {
72 	struct drm_minor *minor;
73 	struct dentry *pxproot;
74 
75 	if (!intel_pxp_is_supported(pxp))
76 		return;
77 
78 	minor = pxp->ctrl_gt->i915->drm.primary;
79 	if (!minor->debugfs_root)
80 		return;
81 
82 	pxproot = debugfs_create_dir("pxp", minor->debugfs_root);
83 	if (IS_ERR(pxproot))
84 		return;
85 
86 	debugfs_create_file("info", 0444, pxproot,
87 			    pxp, &pxp_info_fops);
88 
89 	debugfs_create_file("terminate_state", 0644, pxproot,
90 			    pxp, &pxp_terminate_fops);
91 }
92