diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/core/ramht.c')
-rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/core/ramht.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/core/ramht.c b/drivers/gpu/drm/nouveau/nvkm/core/ramht.c new file mode 100644 index 00000000000..25cd6f29072 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/core/ramht.c @@ -0,0 +1,108 @@ +/* + * Copyright 2012 Red Hat Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <core/object.h> +#include <core/ramht.h> + +#include <subdev/bar.h> + +static u32 +nouveau_ramht_hash(struct nouveau_ramht *ramht, int chid, u32 handle) +{ + u32 hash = 0; + + while (handle) { + hash ^= (handle & ((1 << ramht->bits) - 1)); + handle >>= ramht->bits; + } + + hash ^= chid << (ramht->bits - 4); + hash = hash << 3; + return hash; +} + +int +nouveau_ramht_insert(struct nouveau_ramht *ramht, int chid, + u32 handle, u32 context) +{ + struct nouveau_bar *bar = nouveau_bar(ramht); + u32 co, ho; + + co = ho = nouveau_ramht_hash(ramht, chid, handle); + do { + if (!nv_ro32(ramht, co + 4)) { + nv_wo32(ramht, co + 0, handle); + nv_wo32(ramht, co + 4, context); + if (bar) + bar->flush(bar); + return co; + } + + co += 8; + if (co >= nv_gpuobj(ramht)->size) + co = 0; + } while (co != ho); + + return -ENOMEM; +} + +void +nouveau_ramht_remove(struct nouveau_ramht *ramht, int cookie) +{ + struct nouveau_bar *bar = nouveau_bar(ramht); + nv_wo32(ramht, cookie + 0, 0x00000000); + nv_wo32(ramht, cookie + 4, 0x00000000); + if (bar) + bar->flush(bar); +} + +static struct nouveau_oclass +nouveau_ramht_oclass = { + .handle = 0x0000abcd, + .ofuncs = &(struct nouveau_ofuncs) { + .ctor = NULL, + .dtor = _nouveau_gpuobj_dtor, + .init = _nouveau_gpuobj_init, + .fini = _nouveau_gpuobj_fini, + .rd32 = _nouveau_gpuobj_rd32, + .wr32 = _nouveau_gpuobj_wr32, + }, +}; + +int +nouveau_ramht_new(struct nouveau_object *parent, struct nouveau_object *pargpu, + u32 size, u32 align, struct nouveau_ramht **pramht) +{ + struct nouveau_ramht *ramht; + int ret; + + ret = nouveau_gpuobj_create(parent, parent->engine ? + &parent->engine->subdev.object : parent, /* <nv50 ramht */ + &nouveau_ramht_oclass, 0, pargpu, size, + align, NVOBJ_FLAG_ZERO_ALLOC, &ramht); + *pramht = ramht; + if (ret) + return ret; + + ramht->bits = order_base_2(nv_gpuobj(ramht)->size >> 3); + return 0; +} |