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
pxp_info_show(struct seq_file * m,void * data)21 static 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
37 DEFINE_SHOW_ATTRIBUTE(pxp_info);
38
pxp_terminate_get(void * data,u64 * val)39 static int pxp_terminate_get(void *data, u64 *val)
40 {
41 /* nothing to read */
42 return -EPERM;
43 }
44
pxp_terminate_set(void * data,u64 val)45 static 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
68 DEFINE_SIMPLE_ATTRIBUTE(pxp_terminate_fops, pxp_terminate_get, pxp_terminate_set, "%llx\n");
69
intel_pxp_debugfs_register(struct intel_pxp * pxp)70 void 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 }
92