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 <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
  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
  32 static int pxp_terminate_get(void *data, u64 *val)
  33 {
  34         /* nothing to read */
  35         return -EPERM;
  36 }
  37
  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(&gt->irq_lock);
  48         intel_pxp_irq_handler(pxp, GEN12_DISPLAY_PXP_STATE_TERMINATED_INTERRUPT);
  49         spin_unlock_irq(&gt->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");
  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 }