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 
17 static 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 }
33 DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(pxp_info);
34 
35 static int pxp_terminate_get(void *data, u64 *val)
36 {
37 	/* nothing to read */
38 	return -EPERM;
39 }
40 
41 static 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 
61 DEFINE_SIMPLE_ATTRIBUTE(pxp_terminate_fops, pxp_terminate_get, pxp_terminate_set, "%llx\n");
62 void 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 }
82