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 "pxp/intel_pxp.h" 13 #include "pxp/intel_pxp_irq.h" 14 #include "i915_drv.h" 15 16 static int pxp_info_show(struct seq_file *m, void *data) 17 { 18 struct intel_pxp *pxp = m->private; 19 struct drm_printer p = drm_seq_file_printer(m); 20 bool enabled = intel_pxp_is_enabled(pxp); 21 22 if (!enabled) { 23 drm_printf(&p, "pxp disabled\n"); 24 return 0; 25 } 26 27 drm_printf(&p, "active: %s\n", str_yes_no(intel_pxp_is_active(pxp))); 28 drm_printf(&p, "instance counter: %u\n", pxp->key_instance); 29 30 return 0; 31 } 32 DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(pxp_info); 33 34 static int pxp_terminate_get(void *data, u64 *val) 35 { 36 /* nothing to read */ 37 return -EPERM; 38 } 39 40 static int pxp_terminate_set(void *data, u64 val) 41 { 42 struct intel_pxp *pxp = data; 43 struct intel_gt *gt = pxp_to_gt(pxp); 44 45 if (!intel_pxp_is_active(pxp)) 46 return -ENODEV; 47 48 /* simulate a termination interrupt */ 49 spin_lock_irq(>->irq_lock); 50 intel_pxp_irq_handler(pxp, GEN12_DISPLAY_PXP_STATE_TERMINATED_INTERRUPT); 51 spin_unlock_irq(>->irq_lock); 52 53 if (!wait_for_completion_timeout(&pxp->termination, 54 msecs_to_jiffies(100))) 55 return -ETIMEDOUT; 56 57 return 0; 58 } 59 60 DEFINE_SIMPLE_ATTRIBUTE(pxp_terminate_fops, pxp_terminate_get, pxp_terminate_set, "%llx\n"); 61 void intel_pxp_debugfs_register(struct intel_pxp *pxp, struct dentry *gt_root) 62 { 63 static const struct intel_gt_debugfs_file files[] = { 64 { "info", &pxp_info_fops, NULL }, 65 { "terminate_state", &pxp_terminate_fops, NULL }, 66 }; 67 struct dentry *root; 68 69 if (!gt_root) 70 return; 71 72 if (!HAS_PXP((pxp_to_gt(pxp)->i915))) 73 return; 74 75 root = debugfs_create_dir("pxp", gt_root); 76 if (IS_ERR(root)) 77 return; 78 79 intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), pxp); 80 } 81