git.oblomov.eu Git - nouveau/blob - src/nv_dma.c

   1 #include <errno.h>
   2 #include "nv_include.h"
   3 #include "nvreg.h"
   4
   5 void NVDmaCreateDMAObject(NVPtr pNv, int handle, int target, CARD32 base_address, CARD32 size, int access)
   6 {
   7     drm_nouveau_dma_object_init_t dma;
   8
   9     dma.handle = handle;
  10     dma.access = access;
  11     dma.target = target;
  12     dma.size   = size;
  13     dma.offset = base_address;
  14     drmCommandWrite(pNv->drm_fd, DRM_NOUVEAU_DMA_OBJECT_INIT, &dma, sizeof(dma));
  15 }
  16
  17 /*
  18    A DMA notifier is a DMA object that references a small (32 byte it
  19    seems, we use 256 for saftey) memory area that will be used by the HW to give feedback
  20    about a DMA operation.
  21 */
  22 void *NVDmaCreateNotifier(NVPtr pNv, int handle)
  23 {
  24         uint64_t notifier_base;
  25         void *notifier = NULL;
  26         int target = 0;
  27
  28 #ifndef __powerpc__
  29         if (pNv->agpScratch) {
  30                 drm_nouveau_mem_alloc_t alloc;
  31
  32                 alloc.flags     = NOUVEAU_MEM_AGP|NOUVEAU_MEM_MAPPED;
  33                 alloc.alignment = 0;
  34                 alloc.size      = 256;
  35                 alloc.region_offset = &notifier_base;
  36                 if (!(drmCommandWriteRead(pNv->drm_fd, DRM_NOUVEAU_MEM_ALLOC,
  37                                                 &alloc, sizeof(alloc)))) {
  38                         if (!drmMap(pNv->drm_fd, notifier_base, alloc.size, &notifier))
  39                                 target = NV_DMA_TARGET_AGP;
  40                 }
  41         }
  42 #endif
  43
  44         if (!target) /* FIXME: try a FB notifier when we can alloc the memory */
  45                 return NULL;
  46
  47         NVDmaCreateDMAObject(pNv, handle, target, notifier_base, 256, NV_DMA_ACCES_RW);
  48         return notifier;
  49 }
  50
  51 /*
  52   How do we wait for DMA completion (by notifiers) ?
  53
  54    Either repeatedly read the notifier address and wait until it changes,
  55    or enable a 'wakeup' interrupt by writing NOTIFY_WRITE_LE_AWAKEN into
  56    the 'notify' field of the object in the channel.  My guess is that
  57    this causes an interrupt in PGRAPH/NOTIFY as soon as the transfer is
  58    completed.  Clients probably can use poll on the nv* devices to get this
  59    event.  All this is a guess.  I don't know any details, and I have not
  60    tested is.  Also, I have no idea how the 'nvdriver' reacts if it gets
  61    notify events that are not registered.
  62
  63    Writing NV_NOTIFY_WRITE_LE_AWAKEN into the 'Notify' field of an object
  64    in a channel really causes an interrupt in the PGRAPH engine.  Thus
  65    we can determine whether a DMA transfer has finished in the interrupt
  66    handler.
  67
  68    We can't use interrupts in user land, so we do the simple polling approach.
  69    The method returns FALSE in case of an error.
  70 */
  71 Bool NVDmaWaitForNotifier(NVPtr pNv, void *notifier)
  72 {
  73     int t_start, timeout = 0;
  74     volatile CARD32 *n;
  75
  76     n = (volatile CARD32 *)notifier;
  77     NVDEBUG("NVDmaWaitForNotifier @%p", n);
  78     t_start = GetTimeInMillis();
  79     while (1) {
  80         CARD32 a = n[0];
  81         CARD32 b = n[1];
  82         CARD32 c = n[2];
  83         CARD32 status = n[3];
  84         NVDEBUG("status: n[0]=%x, n[1]=%x, n[2]=%x, n[3]=%x\n", a, b, c, status);
  85         NVDEBUG("status: GET: 0x%08x\n", READ_GET(pNv));
  86
  87         if (GetTimeInMillis() - t_start >= 2000) {
  88             /* We've timed out, call NVSync() to detect lockups */
  89             if (timeout++ == 0) {
  90                 NVDoSync(pNv);
  91                 /* If we're still here, wait another second for notifier.. */
  92                 t_start = GetTimeInMillis() + 1000;
  93                 break;
  94             }
  95
  96             /* Still haven't recieved notification, log error */
  97             ErrorF("Notifier timeout\n");
  98             return FALSE;
  99         }
 100
 101         if (status == 0xffffffff)
 102             continue;
 103         if (!status)
 104             break;
 105         if (status & 0xffff)
 106             return FALSE;
 107     }
 108     return TRUE;
 109 }
 110
 111 void NVDmaCreateContextObject(NVPtr pNv, int handle, int class, CARD32 flags,
 112                               CARD32 dma_in, CARD32 dma_out, CARD32 dma_notifier)
 113 {
 114     drm_nouveau_object_init_t cto;
 115     CARD32 nv_flags0 = 0, nv_flags1 = 0, nv_flags2 = 0;
 116
 117     if (pNv->Architecture >= NV_ARCH_40) {
 118         if (flags & NV_DMA_CONTEXT_FLAGS_PATCH_ROP_AND)
 119             nv_flags0 |= 0x02080000;
 120         else if (flags & NV_DMA_CONTEXT_FLAGS_PATCH_SRCCOPY)
 121             nv_flags0 |= 0x02080000;
 122         if (flags & NV_DMA_CONTEXT_FLAGS_CLIP_ENABLE)
 123             nv_flags0 |= 0x00020000;
 124 #if X_BYTE_ORDER == X_BIG_ENDIAN
 125         if (flags & NV_DMA_CONTEXT_FLAGS_MONO)
 126             nv_flags1 |= 0x01000000;
 127         nv_flags2 |= 0x01000000;
 128 #else
 129         if (flags & NV_DMA_CONTEXT_FLAGS_MONO)
 130             nv_flags1 |= 0x02000000;
 131 #endif
 132     } else {
 133         if (flags & NV_DMA_CONTEXT_FLAGS_PATCH_ROP_AND)
 134             nv_flags0 |= 0x01008000;
 135         else if (flags & NV_DMA_CONTEXT_FLAGS_PATCH_SRCCOPY)
 136             nv_flags0 |= 0x01018000;
 137         if (flags & NV_DMA_CONTEXT_FLAGS_CLIP_ENABLE)
 138             nv_flags0 |= 0x00002000;
 139 #if X_BYTE_ORDER == X_BIG_ENDIAN
 140         nv_flags0 |= 0x00080000;
 141         if (flags & NV_DMA_CONTEXT_FLAGS_MONO)
 142             nv_flags1 |= 0x00000001;
 143 #else
 144         if (flags & NV_DMA_CONTEXT_FLAGS_MONO)
 145             nv_flags1 |= 0x00000002;
 146 #endif
 147     }
 148
 149     cto.handle = handle;
 150     cto.class  = class;
 151     cto.flags0 = nv_flags0;
 152     cto.flags1 = nv_flags1;
 153     cto.flags2 = nv_flags2;
 154     cto.dma0   = dma_in;
 155     cto.dma1   = dma_out;
 156     cto.dma_notifier = dma_notifier;
 157     drmCommandWrite(pNv->drm_fd, DRM_NOUVEAU_OBJECT_INIT, &cto, sizeof(cto));
 158 }
 159
 160 Bool NVInitDma(ScrnInfoPtr pScrn)
 161 {
 162     NVPtr pNv = NVPTR(pScrn);
 163     drm_nouveau_fifo_init_t fifo;
 164
 165     if (!NVDRIScreenInit(pScrn))
 166         return FALSE;
 167
 168     if (drmCommandWriteRead(pNv->drm_fd, DRM_NOUVEAU_FIFO_INIT, &pNv->fifo, sizeof(pNv->fifo)) != 0) {
 169         xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Could not initialise kernel module\n");
 170         return FALSE;
 171     }
 172
 173     if (drmMap(pNv->drm_fd, pNv->fifo.cmdbuf, pNv->fifo.cmdbuf_size, (drmAddressPtr)&pNv->dmaBase)) {
 174         xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Failed to map DMA command buffer\n");
 175         return FALSE;
 176     }
 177
 178     if (drmMap(pNv->drm_fd, pNv->fifo.ctrl, pNv->fifo.ctrl_size, (drmAddressPtr)&pNv->FIFO)) {
 179         xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Failed to map FIFO control regs\n");
 180         return FALSE;
 181     }
 182
 183     xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Using FIFO channel %d\n", pNv->fifo.channel);
 184     xf86DrvMsg(pScrn->scrnIndex, X_INFO, "  Control registers : %p (0x%08x)\n", pNv->FIFO, pNv->fifo.ctrl);
 185     xf86DrvMsg(pScrn->scrnIndex, X_INFO, "  DMA command buffer: %p (0x%08x)\n", pNv->dmaBase, pNv->fifo.cmdbuf);
 186     xf86DrvMsg(pScrn->scrnIndex, X_INFO, "  DMA cmdbuf length : %d KiB\n", pNv->fifo.cmdbuf_size / 1024);
 187     xf86DrvMsg(pScrn->scrnIndex, X_INFO, "  DMA base PUT      : 0x%08x\n", pNv->fifo.put_base);
 188
 189     NVDmaCreateDMAObject(pNv, NvDmaFB, NV_DMA_TARGET_VIDMEM, 0, pNv->VRAMPhysicalSize, NV_DMA_ACCES_RW);
 190
 191     NVDmaCreateContextObject (pNv, NvContextSurfaces,
 192                               (pNv->Architecture >= NV_ARCH_10) ? NV10_CONTEXT_SURFACES_2D : NV4_SURFACE,
 193                               NV_DMA_CONTEXT_FLAGS_PATCH_ROP_AND,
 194                               NvDmaFB, NvDmaFB, 0);
 195     NVDmaCreateContextObject (pNv, NvRop,
 196                               NV_ROP5_SOLID,
 197                               NV_DMA_CONTEXT_FLAGS_PATCH_ROP_AND,
 198                               0, 0, 0);
 199     NVDmaCreateContextObject (pNv, NvImagePattern,
 200                               NV4_IMAGE_PATTERN,
 201                               NV_DMA_CONTEXT_FLAGS_PATCH_ROP_AND|NV_DMA_CONTEXT_FLAGS_MONO,
 202                               0, 0, 0);
 203     NVDmaCreateContextObject (pNv, NvClipRectangle,
 204                               NV_IMAGE_BLACK_RECTANGLE,
 205                               NV_DMA_CONTEXT_FLAGS_PATCH_ROP_AND,
 206                               0, 0, 0);
 207     NVDmaCreateContextObject (pNv, NvSolidLine,
 208                               NV4_RENDER_SOLID_LIN,
 209                               NV_DMA_CONTEXT_FLAGS_PATCH_ROP_AND|NV_DMA_CONTEXT_FLAGS_CLIP_ENABLE,
 210                               0, 0, 0);
 211     NVDmaCreateContextObject (pNv, NvImageBlit,
 212                               pNv->WaitVSyncPossible ? NV12_IMAGE_BLIT : NV_IMAGE_BLIT,
 213                               NV_DMA_CONTEXT_FLAGS_PATCH_ROP_AND,
 214                               NvDmaFB, NvDmaFB, 0);
 215     NVDmaCreateContextObject (pNv, NvRectangle,
 216                               NV4_GDI_RECTANGLE_TEXT,
 217                               NV_DMA_CONTEXT_FLAGS_PATCH_ROP_AND|NV_DMA_CONTEXT_FLAGS_MONO,
 218                               0, 0, 0);
 219     NVDmaCreateContextObject (pNv, NvScaledImage,
 220                               NV_SCALED_IMAGE_FROM_MEMORY,
 221                               NV_DMA_CONTEXT_FLAGS_PATCH_SRCCOPY,
 222                               NvDmaFB, NvDmaFB, 0);
 223
 224 #ifdef XF86DRI
 225     if (NVInitAGP(pScrn) && pNv->agpScratch) {
 226         pNv->Notifier0 = NVDmaCreateNotifier(pNv, NvDmaNotifier0);
 227                 if (pNv->Notifier0) {
 228                         NVDmaCreateDMAObject(pNv, NvDmaAGP, NV_DMA_TARGET_AGP,
 229                                         pNv->agpScratchPhysical, pNv->agpScratchSize, NV_DMA_ACCES_RW);
 230
 231                 NVDmaCreateContextObject (pNv, NvGraphicsToAGP,
 232                                         NV_MEMORY_TO_MEMORY_FORMAT, 0,
 233                                         NvDmaFB, NvDmaAGP, NvDmaNotifier0
 234                                         );
 235
 236             NVDmaCreateContextObject (pNv, NvAGPToGraphics,
 237                                         NV_MEMORY_TO_MEMORY_FORMAT, 0,
 238                                         NvDmaAGP, NvDmaFB, NvDmaNotifier0
 239                                         );
 240                 } else {
 241                         /* FIXME */
 242                         xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Failed to create DMA notifier - DMA transfers disabled\n");
 243                         pNv->agpScratch = NULL;
 244                 }
 245     }
 246 #endif
 247
 248     return TRUE;
 249 }