1 /* 2 * Copyright 2020 Red Hat 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 #include "chid.h" 23 24 static void 25 nvkm_chid_del(struct kref *kref) 26 { 27 struct nvkm_chid *chid = container_of(kref, typeof(*chid), kref); 28 29 nvkm_event_fini(&chid->event); 30 31 kvfree(chid->data); 32 kfree(chid); 33 } 34 35 void 36 nvkm_chid_unref(struct nvkm_chid **pchid) 37 { 38 struct nvkm_chid *chid = *pchid; 39 40 if (!chid) 41 return; 42 43 kref_put(&chid->kref, nvkm_chid_del); 44 *pchid = NULL; 45 } 46 47 struct nvkm_chid * 48 nvkm_chid_ref(struct nvkm_chid *chid) 49 { 50 if (chid) 51 kref_get(&chid->kref); 52 53 return chid; 54 } 55 56 int 57 nvkm_chid_new(const struct nvkm_event_func *func, struct nvkm_subdev *subdev, 58 int nr, int first, int count, struct nvkm_chid **pchid) 59 { 60 struct nvkm_chid *chid; 61 int id; 62 63 if (!(chid = *pchid = kzalloc(struct_size(chid, used, nr), GFP_KERNEL))) 64 return -ENOMEM; 65 66 kref_init(&chid->kref); 67 chid->nr = nr; 68 chid->mask = chid->nr - 1; 69 spin_lock_init(&chid->lock); 70 71 if (!(chid->data = kvzalloc(sizeof(*chid->data) * nr, GFP_KERNEL))) { 72 nvkm_chid_unref(pchid); 73 return -ENOMEM; 74 } 75 76 for (id = 0; id < first; id++) 77 __set_bit(id, chid->used); 78 for (id = first + count; id < nr; id++) 79 __set_bit(id, chid->used); 80 81 return nvkm_event_init(func, subdev, 1, nr, &chid->event); 82 } 83