nvkm/core/engine.c

0001 /*
0002  * Copyright 2012 Red Hat Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Ben Skeggs
0023  */
0024 #include <core/engine.h>
0025 #include <core/device.h>
0026 #include <core/option.h>
0027
0028 #include <subdev/fb.h>
0029
0030 bool
0031 nvkm_engine_chsw_load(struct nvkm_engine *engine)
0032 {
0033     if (engine->func->chsw_load)
0034         return engine->func->chsw_load(engine);
0035     return false;
0036 }
0037
0038 void
0039 nvkm_engine_unref(struct nvkm_engine **pengine)
0040 {
0041     struct nvkm_engine *engine = *pengine;
0042     if (engine) {
0043         if (refcount_dec_and_mutex_lock(&engine->use.refcount, &engine->use.mutex)) {
0044             nvkm_subdev_fini(&engine->subdev, false);
0045             engine->use.enabled = false;
0046             mutex_unlock(&engine->use.mutex);
0047         }
0048         *pengine = NULL;
0049     }
0050 }
0051
0052 struct nvkm_engine *
0053 nvkm_engine_ref(struct nvkm_engine *engine)
0054 {
0055     int ret;
0056     if (engine) {
0057         if (!refcount_inc_not_zero(&engine->use.refcount)) {
0058             mutex_lock(&engine->use.mutex);
0059             if (!refcount_inc_not_zero(&engine->use.refcount)) {
0060                 engine->use.enabled = true;
0061                 if ((ret = nvkm_subdev_init(&engine->subdev))) {
0062                     engine->use.enabled = false;
0063                     mutex_unlock(&engine->use.mutex);
0064                     return ERR_PTR(ret);
0065                 }
0066                 refcount_set(&engine->use.refcount, 1);
0067             }
0068             mutex_unlock(&engine->use.mutex);
0069         }
0070     }
0071     return engine;
0072 }
0073
0074 void
0075 nvkm_engine_tile(struct nvkm_engine *engine, int region)
0076 {
0077     struct nvkm_fb *fb = engine->subdev.device->fb;
0078     if (engine->func->tile)
0079         engine->func->tile(engine, region, &fb->tile.region[region]);
0080 }
0081
0082 static void
0083 nvkm_engine_intr(struct nvkm_subdev *subdev)
0084 {
0085     struct nvkm_engine *engine = nvkm_engine(subdev);
0086     if (engine->func->intr)
0087         engine->func->intr(engine);
0088 }
0089
0090 static int
0091 nvkm_engine_info(struct nvkm_subdev *subdev, u64 mthd, u64 *data)
0092 {
0093     struct nvkm_engine *engine = nvkm_engine(subdev);
0094     if (engine->func->info) {
0095         if (!IS_ERR((engine = nvkm_engine_ref(engine)))) {
0096             int ret = engine->func->info(engine, mthd, data);
0097             nvkm_engine_unref(&engine);
0098             return ret;
0099         }
0100         return PTR_ERR(engine);
0101     }
0102     return -ENOSYS;
0103 }
0104
0105 static int
0106 nvkm_engine_fini(struct nvkm_subdev *subdev, bool suspend)
0107 {
0108     struct nvkm_engine *engine = nvkm_engine(subdev);
0109     if (engine->func->fini)
0110         return engine->func->fini(engine, suspend);
0111     return 0;
0112 }
0113
0114 static int
0115 nvkm_engine_init(struct nvkm_subdev *subdev)
0116 {
0117     struct nvkm_engine *engine = nvkm_engine(subdev);
0118     struct nvkm_fb *fb = subdev->device->fb;
0119     int ret = 0, i;
0120     s64 time;
0121
0122     if (!engine->use.enabled) {
0123         nvkm_trace(subdev, "init skipped, engine has no users\n");
0124         return ret;
0125     }
0126
0127     if (engine->func->oneinit && !engine->subdev.oneinit) {
0128         nvkm_trace(subdev, "one-time init running...\n");
0129         time = ktime_to_us(ktime_get());
0130         ret = engine->func->oneinit(engine);
0131         if (ret) {
0132             nvkm_trace(subdev, "one-time init failed, %d\n", ret);
0133             return ret;
0134         }
0135
0136         engine->subdev.oneinit = true;
0137         time = ktime_to_us(ktime_get()) - time;
0138         nvkm_trace(subdev, "one-time init completed in %lldus\n", time);
0139     }
0140
0141     if (engine->func->init)
0142         ret = engine->func->init(engine);
0143
0144     for (i = 0; fb && i < fb->tile.regions; i++)
0145         nvkm_engine_tile(engine, i);
0146     return ret;
0147 }
0148
0149 static int
0150 nvkm_engine_preinit(struct nvkm_subdev *subdev)
0151 {
0152     struct nvkm_engine *engine = nvkm_engine(subdev);
0153     if (engine->func->preinit)
0154         engine->func->preinit(engine);
0155     return 0;
0156 }
0157
0158 static void *
0159 nvkm_engine_dtor(struct nvkm_subdev *subdev)
0160 {
0161     struct nvkm_engine *engine = nvkm_engine(subdev);
0162     if (engine->func->dtor)
0163         return engine->func->dtor(engine);
0164     mutex_destroy(&engine->use.mutex);
0165     return engine;
0166 }
0167
0168 const struct nvkm_subdev_func
0169 nvkm_engine = {
0170     .dtor = nvkm_engine_dtor,
0171     .preinit = nvkm_engine_preinit,
0172     .init = nvkm_engine_init,
0173     .fini = nvkm_engine_fini,
0174     .info = nvkm_engine_info,
0175     .intr = nvkm_engine_intr,
0176 };
0177
0178 int
0179 nvkm_engine_ctor(const struct nvkm_engine_func *func, struct nvkm_device *device,
0180          enum nvkm_subdev_type type, int inst, bool enable, struct nvkm_engine *engine)
0181 {
0182     nvkm_subdev_ctor(&nvkm_engine, device, type, inst, &engine->subdev);
0183     engine->func = func;
0184     refcount_set(&engine->use.refcount, 0);
0185     mutex_init(&engine->use.mutex);
0186
0187     if (!nvkm_boolopt(device->cfgopt, engine->subdev.name, enable)) {
0188         nvkm_debug(&engine->subdev, "disabled\n");
0189         return -ENODEV;
0190     }
0191
0192     spin_lock_init(&engine->lock);
0193     return 0;
0194 }
0195
0196 int
0197 nvkm_engine_new_(const struct nvkm_engine_func *func, struct nvkm_device *device,
0198          enum nvkm_subdev_type type, int inst, bool enable,
0199          struct nvkm_engine **pengine)
0200 {
0201     if (!(*pengine = kzalloc(sizeof(**pengine), GFP_KERNEL)))
0202         return -ENOMEM;
0203     return nvkm_engine_ctor(func, device, type, inst, enable, *pengine);
0204 }