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