1 /* 2 * padata.h - header for the padata parallelization interface 3 * 4 * Copyright (C) 2008, 2009 secunet Security Networks AG 5 * Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@secunet.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms and conditions of the GNU General Public License, 9 * version 2, as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 19 */ 20 21 #ifndef PADATA_H 22 #define PADATA_H 23 24 #include <linux/workqueue.h> 25 #include <linux/spinlock.h> 26 #include <linux/list.h> 27 #include <linux/timer.h> 28 #include <linux/notifier.h> 29 #include <linux/kobject.h> 30 31 #define PADATA_CPU_SERIAL 0x01 32 #define PADATA_CPU_PARALLEL 0x02 33 34 /** 35 * struct padata_priv - Embedded to the users data structure. 36 * 37 * @list: List entry, to attach to the padata lists. 38 * @pd: Pointer to the internal control structure. 39 * @cb_cpu: Callback cpu for serializatioon. 40 * @seq_nr: Sequence number of the parallelized data object. 41 * @info: Used to pass information from the parallel to the serial function. 42 * @parallel: Parallel execution function. 43 * @serial: Serial complete function. 44 */ 45 struct padata_priv { 46 struct list_head list; 47 struct parallel_data *pd; 48 int cb_cpu; 49 int info; 50 void (*parallel)(struct padata_priv *padata); 51 void (*serial)(struct padata_priv *padata); 52 }; 53 54 /** 55 * struct padata_list 56 * 57 * @list: List head. 58 * @lock: List lock. 59 */ 60 struct padata_list { 61 struct list_head list; 62 spinlock_t lock; 63 }; 64 65 /** 66 * struct padata_serial_queue - The percpu padata serial queue 67 * 68 * @serial: List to wait for serialization after reordering. 69 * @work: work struct for serialization. 70 * @pd: Backpointer to the internal control structure. 71 */ 72 struct padata_serial_queue { 73 struct padata_list serial; 74 struct work_struct work; 75 struct parallel_data *pd; 76 }; 77 78 /** 79 * struct padata_parallel_queue - The percpu padata parallel queue 80 * 81 * @parallel: List to wait for parallelization. 82 * @reorder: List to wait for reordering after parallel processing. 83 * @serial: List to wait for serialization after reordering. 84 * @pwork: work struct for parallelization. 85 * @swork: work struct for serialization. 86 * @pd: Backpointer to the internal control structure. 87 * @work: work struct for parallelization. 88 * @num_obj: Number of objects that are processed by this cpu. 89 * @cpu_index: Index of the cpu. 90 */ 91 struct padata_parallel_queue { 92 struct padata_list parallel; 93 struct padata_list reorder; 94 struct parallel_data *pd; 95 struct work_struct work; 96 atomic_t num_obj; 97 int cpu_index; 98 }; 99 100 /** 101 * struct padata_cpumask - The cpumasks for the parallel/serial workers 102 * 103 * @pcpu: cpumask for the parallel workers. 104 * @cbcpu: cpumask for the serial (callback) workers. 105 */ 106 struct padata_cpumask { 107 cpumask_var_t pcpu; 108 cpumask_var_t cbcpu; 109 }; 110 111 /** 112 * struct parallel_data - Internal control structure, covers everything 113 * that depends on the cpumask in use. 114 * 115 * @pinst: padata instance. 116 * @pqueue: percpu padata queues used for parallelization. 117 * @squeue: percpu padata queues used for serialuzation. 118 * @reorder_objects: Number of objects waiting in the reorder queues. 119 * @refcnt: Number of objects holding a reference on this parallel_data. 120 * @max_seq_nr: Maximal used sequence number. 121 * @cpumask: The cpumasks in use for parallel and serial workers. 122 * @lock: Reorder lock. 123 * @processed: Number of already processed objects. 124 * @timer: Reorder timer. 125 */ 126 struct parallel_data { 127 struct padata_instance *pinst; 128 struct padata_parallel_queue __percpu *pqueue; 129 struct padata_serial_queue __percpu *squeue; 130 atomic_t reorder_objects; 131 atomic_t refcnt; 132 atomic_t seq_nr; 133 struct padata_cpumask cpumask; 134 spinlock_t lock ____cacheline_aligned; 135 unsigned int processed; 136 struct timer_list timer; 137 }; 138 139 /** 140 * struct padata_instance - The overall control structure. 141 * 142 * @cpu_notifier: cpu hotplug notifier. 143 * @wq: The workqueue in use. 144 * @pd: The internal control structure. 145 * @cpumask: User supplied cpumasks for parallel and serial works. 146 * @cpumask_change_notifier: Notifiers chain for user-defined notify 147 * callbacks that will be called when either @pcpu or @cbcpu 148 * or both cpumasks change. 149 * @kobj: padata instance kernel object. 150 * @lock: padata instance lock. 151 * @flags: padata flags. 152 */ 153 struct padata_instance { 154 struct notifier_block cpu_notifier; 155 struct workqueue_struct *wq; 156 struct parallel_data *pd; 157 struct padata_cpumask cpumask; 158 struct blocking_notifier_head cpumask_change_notifier; 159 struct kobject kobj; 160 struct mutex lock; 161 u8 flags; 162 #define PADATA_INIT 1 163 #define PADATA_RESET 2 164 #define PADATA_INVALID 4 165 }; 166 167 extern struct padata_instance *padata_alloc_possible( 168 struct workqueue_struct *wq); 169 extern struct padata_instance *padata_alloc(struct workqueue_struct *wq, 170 const struct cpumask *pcpumask, 171 const struct cpumask *cbcpumask); 172 extern void padata_free(struct padata_instance *pinst); 173 extern int padata_do_parallel(struct padata_instance *pinst, 174 struct padata_priv *padata, int cb_cpu); 175 extern void padata_do_serial(struct padata_priv *padata); 176 extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, 177 cpumask_var_t cpumask); 178 extern int padata_start(struct padata_instance *pinst); 179 extern void padata_stop(struct padata_instance *pinst); 180 extern int padata_register_cpumask_notifier(struct padata_instance *pinst, 181 struct notifier_block *nblock); 182 extern int padata_unregister_cpumask_notifier(struct padata_instance *pinst, 183 struct notifier_block *nblock); 184 #endif 185