sys/external/bsd/drm/dist/bsd-core/drm_pci.c

   1 /*-
   2  * Copyright 2003 Eric Anholt.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  19  * AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  21  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file drm_pci.h
  26  * \brief PCI consistent, DMA-accessible memory allocation.
  27  *
  28  * \author Eric Anholt <anholt@FreeBSD.org>
  29  */
  30
  31 #include "drmP.h"
  32
  33 /**********************************************************************/
  34 /** \name PCI memory */
  35 /*@{*/
  36
  37 #if defined(__FreeBSD__)
  38 static void
  39 drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
  40 {
  41         drm_dma_handle_t *dmah = arg;
  42
  43         if (error != 0)
  44                 return;
  45
  46         KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count"));
  47         dmah->busaddr = segs[0].ds_addr;
  48 }
  49 #endif
  50
  51 /**
  52  * \brief Allocate a physically contiguous DMA-accessible consistent
  53  * memory block.
  54  */
  55 drm_dma_handle_t *
  56 drm_pci_alloc(struct drm_device *dev, size_t size,
  57               size_t align, dma_addr_t maxaddr)
  58 {
  59         drm_dma_handle_t *dmah;
  60         int ret;
  61 #if defined (__NetBSD__)
  62         int nsegs;
  63 #endif
  64
  65         /* Need power-of-two alignment, so fail the allocation if it isn't. */
  66         if ((align & (align - 1)) != 0) {
  67                 DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n",
  68                     (int)align);
  69                 return NULL;
  70         }
  71
  72         dmah = malloc(sizeof(drm_dma_handle_t), DRM_MEM_DMA, M_ZERO | M_NOWAIT);
  73         if (dmah == NULL)
  74                 return NULL;
  75
  76 #if defined__FreeBSD__
  77         /* Make sure we aren't holding locks here */
  78         mtx_assert(&dev->dev_lock, MA_NOTOWNED);
  79         if (mtx_owned(&dev->dev_lock))
  80             DRM_ERROR("called while holding dev_lock\n");
  81         mtx_assert(&dev->dma_lock, MA_NOTOWNED);
  82         if (mtx_owned(&dev->dma_lock))
  83             DRM_ERROR("called while holding dma_lock\n");
  84
  85         ret = bus_dma_tag_create(NULL, align, 0, /* tag, align, boundary */
  86             maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
  87             NULL, NULL, /* filtfunc, filtfuncargs */
  88             size, 1, size, /* maxsize, nsegs, maxsegsize */
  89             0, NULL, NULL, /* flags, lockfunc, lockfuncargs */
  90             &dmah->tag);
  91         if (ret != 0) {
  92                 free(dmah, DRM_MEM_DMA);
  93                 return NULL;
  94         }
  95
  96         ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr,
  97             BUS_DMA_WAITOK | BUS_DMA_ZERO, &dmah->map);
  98         if (ret != 0) {
  99                 bus_dma_tag_destroy(dmah->tag);
 100                 free(dmah, DRM_MEM_DMA);
 101                 return NULL;
 102         }
 103
 104         ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size,
 105             drm_pci_busdma_callback, dmah, BUS_DMA_NOWAIT | BUS_DMA_NOCACHE);
 106         if (ret != 0) {
 107                 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
 108                 bus_dma_tag_destroy(dmah->tag);
 109                 free(dmah, DRM_MEM_DMA);
 110                 return NULL;
 111         }
 112 #elif   defined(__NetBSD__)
 113         KASSERT(maxaddr >= 0xffffffffUL); /* no way to tell bus_dma_alloc */
 114         dmah->tag = dev->pa.pa_dmat; /* use 32-bit DMA tag */
 115
 116         if ((ret = bus_dmamem_alloc(dmah->tag, size, align, 0,
 117             dmah->segs, 1, &nsegs, BUS_DMA_WAITOK)) != 0) {
 118                 printf("drm: Unable to allocate %zu bytes of DMA, error %d\n",
 119                     size, ret);
 120                 dmah->tag = NULL;
 121                 free(dmah, DRM_MEM_DMA);
 122                 return NULL;
 123         }
 124         /* XXX is there a better way to deal with this? */
 125         if (nsegs != 1) {
 126                 printf("drm: bad segment count from bus_dmamem_alloc\n");
 127                 bus_dmamem_free(dmah->tag, dmah->segs, 1);
 128                 dmah->tag = NULL;
 129                 free(dmah, DRM_MEM_DMA);
 130                 return NULL;
 131         }
 132         if ((ret = bus_dmamem_map(dmah->tag, dmah->segs, nsegs, size,
 133              &dmah->vaddr, BUS_DMA_NOWAIT | BUS_DMA_COHERENT | BUS_DMA_NOCACHE)) != 0) {
 134                 printf("drm: Unable to map DMA, error %d\n", ret);
 135                 bus_dmamem_free(dmah->tag, dmah->segs, 1);
 136                 dmah->tag = NULL;
 137                 free(dmah, DRM_MEM_DMA);
 138                 return NULL;
 139         }
 140         if ((ret = bus_dmamap_create(dmah->tag, size, 1, size, maxaddr,
 141              BUS_DMA_NOWAIT, &dmah->map)) != 0) {
 142                 printf("drm: Unable to create DMA map, error %d\n", ret);
 143                 bus_dmamem_unmap(dmah->tag, dmah->vaddr, size);
 144                 bus_dmamem_free(dmah->tag, dmah->segs, 1);
 145                 dmah->tag = NULL;
 146                 free(dmah, DRM_MEM_DMA);
 147                 return NULL;
 148         }
 149         if ((ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr,
 150              size, NULL, BUS_DMA_NOWAIT | BUS_DMA_NOCACHE)) != 0) {
 151                 printf("drm: Unable to load DMA map, error %d\n", ret);
 152                 bus_dmamap_destroy(dmah->tag, dmah->map);
 153                 bus_dmamem_unmap(dmah->tag, dmah->vaddr, size);
 154                 bus_dmamem_free(dmah->tag, dmah->segs, 1);
 155                 dmah->tag = NULL;
 156                 free(dmah, DRM_MEM_DMA);
 157                 return NULL;
 158         }
 159         dmah->busaddr = dmah->map->dm_segs[0].ds_addr;
 160         dmah->size = size;
 161         dmah->nsegs = 1;
 162         memset(dmah->vaddr, 0, size);
 163 #endif
 164
 165         return dmah;
 166 }
 167
 168 /**
 169  * \brief Free a DMA-accessible consistent memory block.
 170  */
 171 void
 172 drm_pci_free(struct drm_device *dev, drm_dma_handle_t *dmah)
 173 {
 174         if (dmah == NULL)
 175                 return;
 176
 177 #if defined(__FreeBSD__)
 178         bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
 179         bus_dma_tag_destroy(dmah->tag);
 180 #elif   defined(__NetBSD__)
 181         bus_dmamap_unload(dmah->tag, dmah->map);
 182         bus_dmamap_destroy(dmah->tag, dmah->map);
 183         bus_dmamem_unmap(dmah->tag, dmah->vaddr, dmah->size);
 184         bus_dmamem_free(dmah->tag, dmah->segs, 1);
 185         dmah->tag = NULL;
 186 #endif
 187
 188         free(dmah, DRM_MEM_DMA);
 189 }
 190
 191 /*@}*/