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      1 /*	$NetBSD: kfd_dbgmgr.c,v 1.3 2021/12/18 23:44:59 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2014 Advanced Micro Devices, Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  */
     25 #include <sys/cdefs.h>
     26 __KERNEL_RCSID(0, "$NetBSD: kfd_dbgmgr.c,v 1.3 2021/12/18 23:44:59 riastradh Exp $");
     27 
     28 #include <linux/types.h>
     29 #include <linux/kernel.h>
     30 #include <linux/log2.h>
     31 #include <linux/sched.h>
     32 #include <linux/slab.h>
     33 #include <linux/device.h>
     34 
     35 #include "kfd_priv.h"
     36 #include "cik_regs.h"
     37 #include "kfd_pm4_headers.h"
     38 #include "kfd_pm4_headers_diq.h"
     39 #include "kfd_dbgmgr.h"
     40 #include "kfd_dbgdev.h"
     41 #include "kfd_device_queue_manager.h"
     42 
     43 static DEFINE_MUTEX(kfd_dbgmgr_mutex);
     44 
     45 struct mutex *kfd_get_dbgmgr_mutex(void)
     46 {
     47 	return &kfd_dbgmgr_mutex;
     48 }
     49 
     50 
     51 static void kfd_dbgmgr_uninitialize(struct kfd_dbgmgr *pmgr)
     52 {
     53 	kfree(pmgr->dbgdev);
     54 
     55 	pmgr->dbgdev = NULL;
     56 	pmgr->pasid = 0;
     57 	pmgr->dev = NULL;
     58 }
     59 
     60 void kfd_dbgmgr_destroy(struct kfd_dbgmgr *pmgr)
     61 {
     62 	if (pmgr) {
     63 		kfd_dbgmgr_uninitialize(pmgr);
     64 		kfree(pmgr);
     65 	}
     66 }
     67 
     68 bool kfd_dbgmgr_create(struct kfd_dbgmgr **ppmgr, struct kfd_dev *pdev)
     69 {
     70 	enum DBGDEV_TYPE type = DBGDEV_TYPE_DIQ;
     71 	struct kfd_dbgmgr *new_buff;
     72 
     73 	if (WARN_ON(!pdev->init_complete))
     74 		return false;
     75 
     76 	new_buff = kfd_alloc_struct(new_buff);
     77 	if (!new_buff) {
     78 		pr_err("Failed to allocate dbgmgr instance\n");
     79 		return false;
     80 	}
     81 
     82 	new_buff->pasid = 0;
     83 	new_buff->dev = pdev;
     84 	new_buff->dbgdev = kfd_alloc_struct(new_buff->dbgdev);
     85 	if (!new_buff->dbgdev) {
     86 		pr_err("Failed to allocate dbgdev instance\n");
     87 		kfree(new_buff);
     88 		return false;
     89 	}
     90 
     91 	/* get actual type of DBGDevice cpsch or not */
     92 	if (pdev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS)
     93 		type = DBGDEV_TYPE_NODIQ;
     94 
     95 	kfd_dbgdev_init(new_buff->dbgdev, pdev, type);
     96 	*ppmgr = new_buff;
     97 
     98 	return true;
     99 }
    100 
    101 long kfd_dbgmgr_register(struct kfd_dbgmgr *pmgr, struct kfd_process *p)
    102 {
    103 	if (pmgr->pasid != 0) {
    104 		pr_debug("H/W debugger is already active using pasid 0x%x\n",
    105 				pmgr->pasid);
    106 		return -EBUSY;
    107 	}
    108 
    109 	/* remember pasid */
    110 	pmgr->pasid = p->pasid;
    111 
    112 	/* provide the pqm for diq generation */
    113 	pmgr->dbgdev->pqm = &p->pqm;
    114 
    115 	/* activate the actual registering */
    116 	pmgr->dbgdev->dbgdev_register(pmgr->dbgdev);
    117 
    118 	return 0;
    119 }
    120 
    121 long kfd_dbgmgr_unregister(struct kfd_dbgmgr *pmgr, struct kfd_process *p)
    122 {
    123 	/* Is the requests coming from the already registered process? */
    124 	if (pmgr->pasid != p->pasid) {
    125 		pr_debug("H/W debugger is not registered by calling pasid 0x%x\n",
    126 				p->pasid);
    127 		return -EINVAL;
    128 	}
    129 
    130 	pmgr->dbgdev->dbgdev_unregister(pmgr->dbgdev);
    131 
    132 	pmgr->pasid = 0;
    133 
    134 	return 0;
    135 }
    136 
    137 long kfd_dbgmgr_wave_control(struct kfd_dbgmgr *pmgr,
    138 				struct dbg_wave_control_info *wac_info)
    139 {
    140 	/* Is the requests coming from the already registered process? */
    141 	if (pmgr->pasid != wac_info->process->pasid) {
    142 		pr_debug("H/W debugger support was not registered for requester pasid 0x%x\n",
    143 				wac_info->process->pasid);
    144 		return -EINVAL;
    145 	}
    146 
    147 	return (long) pmgr->dbgdev->dbgdev_wave_control(pmgr->dbgdev, wac_info);
    148 }
    149 
    150 long kfd_dbgmgr_address_watch(struct kfd_dbgmgr *pmgr,
    151 				struct dbg_address_watch_info *adw_info)
    152 {
    153 	/* Is the requests coming from the already registered process? */
    154 	if (pmgr->pasid != adw_info->process->pasid) {
    155 		pr_debug("H/W debugger support was not registered for requester pasid 0x%x\n",
    156 				adw_info->process->pasid);
    157 		return -EINVAL;
    158 	}
    159 
    160 	return (long) pmgr->dbgdev->dbgdev_address_watch(pmgr->dbgdev,
    161 							adw_info);
    162 }
    163 
    164