drivers/gpu/drm/i915/pxp/intel_pxp_debugfs.c

   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 }