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
  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
  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
  39 static int pxp_terminate_get(void *data, u64 *val)
  40 {
  41         /* nothing to read */
  42         return -EPERM;
  43 }
  44
  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
  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 }