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_irq.h"
18 #include "intel_pxp_types.h"
19
pxp_info_show(struct seq_file * m,void * data)20 static int pxp_info_show(struct seq_file *m, void *data)
21 {
22 struct intel_pxp *pxp = m->private;
23 struct drm_printer p = drm_seq_file_printer(m);
24
25 if (!intel_pxp_is_enabled(pxp)) {
26 drm_printf(&p, "pxp disabled\n");
27 return 0;
28 }
29
30 drm_printf(&p, "active: %s\n", str_yes_no(intel_pxp_is_active(pxp)));
31 drm_printf(&p, "instance counter: %u\n", pxp->key_instance);
32
33 return 0;
34 }
35
36 DEFINE_SHOW_ATTRIBUTE(pxp_info);
37
pxp_terminate_get(void * data,u64 * val)38 static int pxp_terminate_get(void *data, u64 *val)
39 {
40 /* nothing to read */
41 return -EPERM;
42 }
43
pxp_terminate_set(void * data,u64 val)44 static int pxp_terminate_set(void *data, u64 val)
45 {
46 struct intel_pxp *pxp = data;
47 struct intel_gt *gt = pxp->ctrl_gt;
48
49 if (!intel_pxp_is_active(pxp))
50 return -ENODEV;
51
52 /* simulate a termination interrupt */
53 spin_lock_irq(gt->irq_lock);
54 intel_pxp_irq_handler(pxp, GEN12_DISPLAY_PXP_STATE_TERMINATED_INTERRUPT);
55 spin_unlock_irq(gt->irq_lock);
56
57 if (!wait_for_completion_timeout(&pxp->termination,
58 msecs_to_jiffies(100)))
59 return -ETIMEDOUT;
60
61 return 0;
62 }
63
64 DEFINE_SIMPLE_ATTRIBUTE(pxp_terminate_fops, pxp_terminate_get, pxp_terminate_set, "%llx\n");
65
intel_pxp_debugfs_register(struct intel_pxp * pxp)66 void intel_pxp_debugfs_register(struct intel_pxp *pxp)
67 {
68 struct drm_minor *minor;
69 struct dentry *pxproot;
70
71 if (!intel_pxp_is_supported(pxp))
72 return;
73
74 minor = pxp->ctrl_gt->i915->drm.primary;
75 if (!minor->debugfs_root)
76 return;
77
78 pxproot = debugfs_create_dir("pxp", minor->debugfs_root);
79 if (IS_ERR(pxproot))
80 return;
81
82 debugfs_create_file("info", 0444, pxproot,
83 pxp, &pxp_info_fops);
84
85 debugfs_create_file("terminate_state", 0644, pxproot,
86 pxp, &pxp_terminate_fops);
87 }
88