1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2021 Intel Corporation
4 */
5
6 #include <linux/debugfs.h>
7 #include <drm/drm_print.h>
8
9 #include "gt/intel_gt_debugfs.h"
10 #include "pxp/intel_pxp.h"
11 #include "pxp/intel_pxp_irq.h"
12 #include "i915_drv.h"
13
pxp_info_show(struct seq_file * m,void * data)14 static int pxp_info_show(struct seq_file *m, void *data)
15 {
16 struct intel_pxp *pxp = m->private;
17 struct drm_printer p = drm_seq_file_printer(m);
18 bool enabled = intel_pxp_is_enabled(pxp);
19
20 if (!enabled) {
21 drm_printf(&p, "pxp disabled\n");
22 return 0;
23 }
24
25 drm_printf(&p, "active: %s\n", yesno(intel_pxp_is_active(pxp)));
26 drm_printf(&p, "instance counter: %u\n", pxp->key_instance);
27
28 return 0;
29 }
30 DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(pxp_info);
31
pxp_terminate_get(void * data,u64 * val)32 static int pxp_terminate_get(void *data, u64 *val)
33 {
34 /* nothing to read */
35 return -EPERM;
36 }
37
pxp_terminate_set(void * data,u64 val)38 static int pxp_terminate_set(void *data, u64 val)
39 {
40 struct intel_pxp *pxp = data;
41 struct intel_gt *gt = pxp_to_gt(pxp);
42
43 if (!intel_pxp_is_active(pxp))
44 return -ENODEV;
45
46 /* simulate a termination interrupt */
47 spin_lock_irq(>->irq_lock);
48 intel_pxp_irq_handler(pxp, GEN12_DISPLAY_PXP_STATE_TERMINATED_INTERRUPT);
49 spin_unlock_irq(>->irq_lock);
50
51 if (!wait_for_completion_timeout(&pxp->termination,
52 msecs_to_jiffies(100)))
53 return -ETIMEDOUT;
54
55 return 0;
56 }
57
58 DEFINE_SIMPLE_ATTRIBUTE(pxp_terminate_fops, pxp_terminate_get, pxp_terminate_set, "%llx\n");
intel_pxp_debugfs_register(struct intel_pxp * pxp,struct dentry * gt_root)59 void intel_pxp_debugfs_register(struct intel_pxp *pxp, struct dentry *gt_root)
60 {
61 static const struct intel_gt_debugfs_file files[] = {
62 { "info", &pxp_info_fops, NULL },
63 { "terminate_state", &pxp_terminate_fops, NULL },
64 };
65 struct dentry *root;
66
67 if (!gt_root)
68 return;
69
70 if (!HAS_PXP((pxp_to_gt(pxp)->i915)))
71 return;
72
73 root = debugfs_create_dir("pxp", gt_root);
74 if (IS_ERR(root))
75 return;
76
77 intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), pxp);
78 }
79