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#include "i915_drv.h"
13#include "intel_pxp.h"
14#include "intel_pxp_debugfs.h"
15#include "intel_pxp_irq.h"
16
17static int pxp_info_show(struct seq_file *m, void *data)
18{
19	struct intel_pxp *pxp = m->private;
20	struct drm_printer p = drm_seq_file_printer(m);
21	bool enabled = intel_pxp_is_enabled(pxp);
22
23	if (!enabled) {
24		drm_printf(&p, "pxp disabled\n");
25		return 0;
26	}
27
28	drm_printf(&p, "active: %s\n", str_yes_no(intel_pxp_is_active(pxp)));
29	drm_printf(&p, "instance counter: %u\n", pxp->key_instance);
30
31	return 0;
32}
33DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(pxp_info);
34
35static int pxp_terminate_get(void *data, u64 *val)
36{
37	/* nothing to read */
38	return -EPERM;
39}
40
41static int pxp_terminate_set(void *data, u64 val)
42{
43	struct intel_pxp *pxp = data;
44	struct intel_gt *gt = pxp_to_gt(pxp);
45
46	if (!intel_pxp_is_active(pxp))
47		return -ENODEV;
48
49	/* simulate a termination interrupt */
50	spin_lock_irq(gt->irq_lock);
51	intel_pxp_irq_handler(pxp, GEN12_DISPLAY_PXP_STATE_TERMINATED_INTERRUPT);
52	spin_unlock_irq(gt->irq_lock);
53
54	if (!wait_for_completion_timeout(&pxp->termination,
55					 msecs_to_jiffies(100)))
56		return -ETIMEDOUT;
57
58	return 0;
59}
60
61DEFINE_SIMPLE_ATTRIBUTE(pxp_terminate_fops, pxp_terminate_get, pxp_terminate_set, "%llx\n");
62void intel_pxp_debugfs_register(struct intel_pxp *pxp, struct dentry *gt_root)
63{
64	static const struct intel_gt_debugfs_file files[] = {
65		{ "info", &pxp_info_fops, NULL },
66		{ "terminate_state", &pxp_terminate_fops, NULL },
67	};
68	struct dentry *root;
69
70	if (!gt_root)
71		return;
72
73	if (!HAS_PXP((pxp_to_gt(pxp)->i915)))
74		return;
75
76	root = debugfs_create_dir("pxp", gt_root);
77	if (IS_ERR(root))
78		return;
79
80	intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), pxp);
81}