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