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
21static 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
37DEFINE_SHOW_ATTRIBUTE(pxp_info);
38
39static int pxp_terminate_get(void *data, u64 *val)
40{
41	/* nothing to read */
42	return -EPERM;
43}
44
45static 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
68DEFINE_SIMPLE_ATTRIBUTE(pxp_terminate_fops, pxp_terminate_get, pxp_terminate_set, "%llx\n");
69
70void 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}