drivers/gpu/drm/nouveau/nouveau_chan.c

   1 /*
   2  * Copyright 2012 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  * Authors: Ben Skeggs
  23  */
  24
  25 #include <core/object.h>
  26 #include <core/client.h>
  27 #include <core/device.h>
  28 #include <core/class.h>
  29
  30 #include <subdev/fb.h>
  31 #include <subdev/vm.h>
  32 #include <subdev/instmem.h>
  33
  34 #include <engine/software.h>
  35
  36 #include "nouveau_drm.h"
  37 #include "nouveau_dma.h"
  38 #include "nouveau_bo.h"
  39 #include "nouveau_chan.h"
  40 #include "nouveau_fence.h"
  41 #include "nouveau_abi16.h"
  42
  43 MODULE_PARM_DESC(vram_pushbuf, "Create DMA push buffers in VRAM");
  44 static int nouveau_vram_pushbuf;
  45 module_param_named(vram_pushbuf, nouveau_vram_pushbuf, int, 0400);
  46
  47 int
  48 nouveau_channel_idle(struct nouveau_channel *chan)
  49 {
  50         struct nouveau_drm *drm = chan->drm;
  51         struct nouveau_fence *fence = NULL;
  52         int ret;
  53
  54         ret = nouveau_fence_new(chan, &fence);
  55         if (!ret) {
  56                 ret = nouveau_fence_wait(fence, false, false);
  57                 nouveau_fence_unref(&fence);
  58         }
  59
  60         if (ret)
  61                 NV_ERROR(drm, "failed to idle channel 0x%08x\n", chan->handle);
  62         return ret;
  63 }
  64
  65 void
  66 nouveau_channel_del(struct nouveau_channel **pchan)
  67 {
  68         struct nouveau_channel *chan = *pchan;
  69         if (chan) {
  70                 struct nouveau_object *client = nv_object(chan->cli);
  71                 if (chan->fence) {
  72                         nouveau_channel_idle(chan);
  73                         nouveau_fence(chan->drm)->context_del(chan);
  74                 }
  75                 nouveau_object_del(client, NVDRM_DEVICE, chan->handle);
  76                 nouveau_object_del(client, NVDRM_DEVICE, chan->push.handle);
  77                 nouveau_bo_vma_del(chan->push.buffer, &chan->push.vma);
  78                 nouveau_bo_unmap(chan->push.buffer);
  79                 nouveau_bo_ref(NULL, &chan->push.buffer);
  80                 kfree(chan);
  81         }
  82         *pchan = NULL;
  83 }
  84
  85 static int
  86 nouveau_channel_prep(struct nouveau_drm *drm, struct nouveau_cli *cli,
  87                      u32 parent, u32 handle, u32 size,
  88                      struct nouveau_channel **pchan)
  89 {
  90         struct nouveau_device *device = nv_device(drm->device);
  91         struct nouveau_instmem *imem = nouveau_instmem(device);
  92         struct nouveau_vmmgr *vmm = nouveau_vmmgr(device);
  93         struct nouveau_fb *pfb = nouveau_fb(device);
  94         struct nouveau_client *client = &cli->base;
  95         struct nv_dma_class args = {};
  96         struct nouveau_channel *chan;
  97         struct nouveau_object *push;
  98         u32 target;
  99         int ret;
 100
 101         chan = *pchan = kzalloc(sizeof(*chan), GFP_KERNEL);
 102         if (!chan)
 103                 return -ENOMEM;
 104
 105         chan->cli = cli;
 106         chan->drm = drm;
 107         chan->handle = handle;
 108
 109         /* allocate memory for dma push buffer */
 110         target = TTM_PL_FLAG_TT;
 111         if (nouveau_vram_pushbuf)
 112                 target = TTM_PL_FLAG_VRAM;
 113
 114         ret = nouveau_bo_new(drm->dev, size, 0, target, 0, 0, NULL,
 115                             &chan->push.buffer);
 116         if (ret == 0) {
 117                 ret = nouveau_bo_pin(chan->push.buffer, target);
 118                 if (ret == 0)
 119                         ret = nouveau_bo_map(chan->push.buffer);
 120         }
 121
 122         if (ret) {
 123                 nouveau_channel_del(pchan);
 124                 return ret;
 125         }
 126
 127         /* create dma object covering the *entire* memory space that the
 128          * pushbuf lives in, this is because the GEM code requires that
 129          * we be able to call out to other (indirect) push buffers
 130          */
 131         chan->push.vma.offset = chan->push.buffer->bo.offset;
 132         chan->push.handle = NVDRM_PUSH | (handle & 0xffff);
 133
 134         if (device->card_type >= NV_50) {
 135                 ret = nouveau_bo_vma_add(chan->push.buffer, client->vm,
 136                                         &chan->push.vma);
 137                 if (ret) {
 138                         nouveau_channel_del(pchan);
 139                         return ret;
 140                 }
 141
 142                 args.flags = NV_DMA_TARGET_VM | NV_DMA_ACCESS_VM;
 143                 args.start = 0;
 144                 args.limit = client->vm->vmm->limit - 1;
 145         } else
 146         if (chan->push.buffer->bo.mem.mem_type == TTM_PL_VRAM) {
 147                 u64 limit = pfb->ram.size - imem->reserved - 1;
 148                 if (device->card_type == NV_04) {
 149                         /* nv04 vram pushbuf hack, retarget to its location in
 150                          * the framebuffer bar rather than direct vram access..
 151                          * nfi why this exists, it came from the -nv ddx.
 152                          */
 153                         args.flags = NV_DMA_TARGET_PCI | NV_DMA_ACCESS_RDWR;
 154                         args.start = pci_resource_start(device->pdev, 1);
 155                         args.limit = args.start + limit;
 156                 } else {
 157                         args.flags = NV_DMA_TARGET_VRAM | NV_DMA_ACCESS_RDWR;
 158                         args.start = 0;
 159                         args.limit = limit;
 160                 }
 161         } else {
 162                 if (chan->drm->agp.stat == ENABLED) {
 163                         args.flags = NV_DMA_TARGET_AGP | NV_DMA_ACCESS_RDWR;
 164                         args.start = chan->drm->agp.base;
 165                         args.limit = chan->drm->agp.base +
 166                                      chan->drm->agp.size - 1;
 167                 } else {
 168                         args.flags = NV_DMA_TARGET_VM | NV_DMA_ACCESS_RDWR;
 169                         args.start = 0;
 170                         args.limit = vmm->limit - 1;
 171                 }
 172         }
 173
 174         ret = nouveau_object_new(nv_object(chan->cli), parent,
 175                                  chan->push.handle, 0x0002,
 176                                  &args, sizeof(args), &push);
 177         if (ret) {
 178                 nouveau_channel_del(pchan);
 179                 return ret;
 180         }
 181
 182         return 0;
 183 }
 184
 185 int
 186 nouveau_channel_ind(struct nouveau_drm *drm, struct nouveau_cli *cli,
 187                     u32 parent, u32 handle, struct nouveau_channel **pchan)
 188 {
 189         static const u16 oclasses[] = { 0xa06f, 0x906f, 0x826f, 0x506f, 0 };
 190         const u16 *oclass = oclasses;
 191         struct nv_channel_ind_class args;
 192         struct nouveau_channel *chan;
 193         int ret;
 194
 195         /* allocate dma push buffer */
 196         ret = nouveau_channel_prep(drm, cli, parent, handle, 0x12000, &chan);
 197         *pchan = chan;
 198         if (ret)
 199                 return ret;
 200
 201         /* create channel object */
 202         args.pushbuf = chan->push.handle;
 203         args.ioffset = 0x10000 + chan->push.vma.offset;
 204         args.ilength = 0x02000;
 205
 206         do {
 207                 ret = nouveau_object_new(nv_object(cli), parent, handle,
 208                                          *oclass++, &args, sizeof(args),
 209                                          &chan->object);
 210                 if (ret == 0)
 211                         return ret;
 212         } while (*oclass);
 213
 214         nouveau_channel_del(pchan);
 215         return ret;
 216 }
 217
 218 static int
 219 nouveau_channel_dma(struct nouveau_drm *drm, struct nouveau_cli *cli,
 220                     u32 parent, u32 handle, struct nouveau_channel **pchan)
 221 {
 222         static const u16 oclasses[] = { 0x006e, 0 };
 223         const u16 *oclass = oclasses;
 224         struct nv_channel_dma_class args;
 225         struct nouveau_channel *chan;
 226         int ret;
 227
 228         /* allocate dma push buffer */
 229         ret = nouveau_channel_prep(drm, cli, parent, handle, 0x10000, &chan);
 230         *pchan = chan;
 231         if (ret)
 232                 return ret;
 233
 234         /* create channel object */
 235         args.pushbuf = chan->push.handle;
 236         args.offset = chan->push.vma.offset;
 237
 238         do {
 239                 ret = nouveau_object_new(nv_object(cli), parent, handle,
 240                                          *oclass++, &args, sizeof(args),
 241                                          &chan->object);
 242                 if (ret == 0)
 243                         return ret;
 244         } while (ret && *oclass);
 245
 246         nouveau_channel_del(pchan);
 247         return ret;
 248 }
 249
 250 static int
 251 nouveau_channel_init(struct nouveau_channel *chan, u32 vram, u32 gart)
 252 {
 253         struct nouveau_client *client = nv_client(chan->cli);
 254         struct nouveau_device *device = nv_device(chan->drm->device);
 255         struct nouveau_instmem *imem = nouveau_instmem(device);
 256         struct nouveau_vmmgr *vmm = nouveau_vmmgr(device);
 257         struct nouveau_fb *pfb = nouveau_fb(device);
 258         struct nouveau_software_chan *swch;
 259         struct nouveau_object *object;
 260         struct nv_dma_class args;
 261         int ret, i;
 262
 263         chan->vram = vram;
 264         chan->gart = gart;
 265
 266         /* allocate dma objects to cover all allowed vram, and gart */
 267         if (device->card_type < NV_C0) {
 268                 if (device->card_type >= NV_50) {
 269                         args.flags = NV_DMA_TARGET_VM | NV_DMA_ACCESS_VM;
 270                         args.start = 0;
 271                         args.limit = client->vm->vmm->limit - 1;
 272                 } else {
 273                         args.flags = NV_DMA_TARGET_VRAM | NV_DMA_ACCESS_RDWR;
 274                         args.start = 0;
 275                         args.limit = pfb->ram.size - imem->reserved - 1;
 276                 }
 277
 278                 ret = nouveau_object_new(nv_object(client), chan->handle, vram,
 279                                          0x003d, &args, sizeof(args), &object);
 280                 if (ret)
 281                         return ret;
 282
 283                 if (device->card_type >= NV_50) {
 284                         args.flags = NV_DMA_TARGET_VM | NV_DMA_ACCESS_VM;
 285                         args.start = 0;
 286                         args.limit = client->vm->vmm->limit - 1;
 287                 } else
 288                 if (chan->drm->agp.stat == ENABLED) {
 289                         args.flags = NV_DMA_TARGET_AGP | NV_DMA_ACCESS_RDWR;
 290                         args.start = chan->drm->agp.base;
 291                         args.limit = chan->drm->agp.base +
 292                                      chan->drm->agp.size - 1;
 293                 } else {
 294                         args.flags = NV_DMA_TARGET_VM | NV_DMA_ACCESS_RDWR;
 295                         args.start = 0;
 296                         args.limit = vmm->limit - 1;
 297                 }
 298
 299                 ret = nouveau_object_new(nv_object(client), chan->handle, gart,
 300                                          0x003d, &args, sizeof(args), &object);
 301                 if (ret)
 302                         return ret;
 303         }
 304
 305         /* initialise dma tracking parameters */
 306         switch (nv_hclass(chan->object) & 0xffff) {
 307         case 0x006e:
 308                 chan->user_put = 0x40;
 309                 chan->user_get = 0x44;
 310                 chan->dma.max = (0x10000 / 4) - 2;
 311                 break;
 312         default:
 313                 chan->user_put = 0x40;
 314                 chan->user_get = 0x44;
 315                 chan->user_get_hi = 0x60;
 316                 chan->dma.ib_base =  0x10000 / 4;
 317                 chan->dma.ib_max  = (0x02000 / 8) - 1;
 318                 chan->dma.ib_put  = 0;
 319                 chan->dma.ib_free = chan->dma.ib_max - chan->dma.ib_put;
 320                 chan->dma.max = chan->dma.ib_base;
 321                 break;
 322         }
 323
 324         chan->dma.put = 0;
 325         chan->dma.cur = chan->dma.put;
 326         chan->dma.free = chan->dma.max - chan->dma.cur;
 327
 328         ret = RING_SPACE(chan, NOUVEAU_DMA_SKIPS);
 329         if (ret)
 330                 return ret;
 331
 332         for (i = 0; i < NOUVEAU_DMA_SKIPS; i++)
 333                 OUT_RING(chan, 0x00000000);
 334
 335         /* allocate software object class (used for fences on <= nv05, and
 336          * to signal flip completion), bind it to a subchannel.
 337          */
 338         ret = nouveau_object_new(nv_object(client), chan->handle,
 339                                  NvSw, nouveau_abi16_swclass(chan->drm),
 340                                  NULL, 0, &object);
 341         if (ret)
 342                 return ret;
 343
 344         swch = (void *)object->parent;
 345         swch->flip = nouveau_flip_complete;
 346         swch->flip_data = chan;
 347
 348         if (device->card_type < NV_C0) {
 349                 ret = RING_SPACE(chan, 2);
 350                 if (ret)
 351                         return ret;
 352
 353                 BEGIN_NV04(chan, NvSubSw, 0x0000, 1);
 354                 OUT_RING  (chan, NvSw);
 355                 FIRE_RING (chan);
 356         }
 357
 358         /* initialise synchronisation */
 359         return nouveau_fence(chan->drm)->context_new(chan);
 360 }
 361
 362 int
 363 nouveau_channel_new(struct nouveau_drm *drm, struct nouveau_cli *cli,
 364                     u32 parent, u32 handle, u32 vram, u32 gart,
 365                     struct nouveau_channel **pchan)
 366 {
 367         int ret;
 368
 369         ret = nouveau_channel_ind(drm, cli, parent, handle, pchan);
 370         if (ret) {
 371                 NV_DEBUG(drm, "ib channel create, %d\n", ret);
 372                 ret = nouveau_channel_dma(drm, cli, parent, handle, pchan);
 373                 if (ret) {
 374                         NV_DEBUG(drm, "dma channel create, %d\n", ret);
 375                         return ret;
 376                 }
 377         }
 378
 379         ret = nouveau_channel_init(*pchan, vram, gart);
 380         if (ret) {
 381                 NV_ERROR(drm, "channel failed to initialise, %d\n", ret);
 382                 nouveau_channel_del(pchan);
 383                 return ret;
 384         }
 385
 386         return 0;
 387 }