drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c

   1 /**************************************************************************
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   3  * Copyright © 2009-2015 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
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   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
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   9  * without limitation the rights to use, copy, modify, merge, publish,
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "vmwgfx_drv.h"
  29 #include <drm/drmP.h>
  30 #include <drm/ttm/ttm_bo_driver.h>
  31
  32 #define VMW_PPN_SIZE (sizeof(unsigned long))
  33 /* A future safe maximum remap size. */
  34 #define VMW_PPN_PER_REMAP ((31 * 1024) / VMW_PPN_SIZE)
  35 #define DMA_ADDR_INVALID ((dma_addr_t) 0)
  36 #define DMA_PAGE_INVALID 0UL
  37
  38 static int vmw_gmr2_bind(struct vmw_private *dev_priv,
  39                          struct vmw_piter *iter,
  40                          unsigned long num_pages,
  41                          int gmr_id)
  42 {
  43         SVGAFifoCmdDefineGMR2 define_cmd;
  44         SVGAFifoCmdRemapGMR2 remap_cmd;
  45         uint32_t *cmd;
  46         uint32_t *cmd_orig;
  47         uint32_t define_size = sizeof(define_cmd) + sizeof(*cmd);
  48         uint32_t remap_num = num_pages / VMW_PPN_PER_REMAP + ((num_pages % VMW_PPN_PER_REMAP) > 0);
  49         uint32_t remap_size = VMW_PPN_SIZE * num_pages + (sizeof(remap_cmd) + sizeof(*cmd)) * remap_num;
  50         uint32_t remap_pos = 0;
  51         uint32_t cmd_size = define_size + remap_size;
  52         uint32_t i;
  53
  54         cmd_orig = cmd = vmw_fifo_reserve(dev_priv, cmd_size);
  55         if (unlikely(cmd == NULL))
  56                 return -ENOMEM;
  57
  58         define_cmd.gmrId = gmr_id;
  59         define_cmd.numPages = num_pages;
  60
  61         *cmd++ = SVGA_CMD_DEFINE_GMR2;
  62         memcpy(cmd, &define_cmd, sizeof(define_cmd));
  63         cmd += sizeof(define_cmd) / sizeof(*cmd);
  64
  65         /*
  66          * Need to split the command if there are too many
  67          * pages that goes into the gmr.
  68          */
  69
  70         remap_cmd.gmrId = gmr_id;
  71         remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?
  72                 SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;
  73
  74         while (num_pages > 0) {
  75                 unsigned long nr = min(num_pages, (unsigned long)VMW_PPN_PER_REMAP);
  76
  77                 remap_cmd.offsetPages = remap_pos;
  78                 remap_cmd.numPages = nr;
  79
  80                 *cmd++ = SVGA_CMD_REMAP_GMR2;
  81                 memcpy(cmd, &remap_cmd, sizeof(remap_cmd));
  82                 cmd += sizeof(remap_cmd) / sizeof(*cmd);
  83
  84                 for (i = 0; i < nr; ++i) {
  85                         if (VMW_PPN_SIZE <= 4)
  86                                 *cmd = vmw_piter_dma_addr(iter) >> PAGE_SHIFT;
  87                         else
  88                                 *((uint64_t *)cmd) = vmw_piter_dma_addr(iter) >>
  89                                         PAGE_SHIFT;
  90
  91                         cmd += VMW_PPN_SIZE / sizeof(*cmd);
  92                         vmw_piter_next(iter);
  93                 }
  94
  95                 num_pages -= nr;
  96                 remap_pos += nr;
  97         }
  98
  99         BUG_ON(cmd != cmd_orig + cmd_size / sizeof(*cmd));
 100
 101         vmw_fifo_commit(dev_priv, cmd_size);
 102
 103         return 0;
 104 }
 105
 106 static void vmw_gmr2_unbind(struct vmw_private *dev_priv,
 107                             int gmr_id)
 108 {
 109         SVGAFifoCmdDefineGMR2 define_cmd;
 110         uint32_t define_size = sizeof(define_cmd) + 4;
 111         uint32_t *cmd;
 112
 113         cmd = vmw_fifo_reserve(dev_priv, define_size);
 114         if (unlikely(cmd == NULL)) {
 115                 DRM_ERROR("GMR2 unbind failed.\n");
 116                 return;
 117         }
 118         define_cmd.gmrId = gmr_id;
 119         define_cmd.numPages = 0;
 120
 121         *cmd++ = SVGA_CMD_DEFINE_GMR2;
 122         memcpy(cmd, &define_cmd, sizeof(define_cmd));
 123
 124         vmw_fifo_commit(dev_priv, define_size);
 125 }
 126
 127
 128 int vmw_gmr_bind(struct vmw_private *dev_priv,
 129                  const struct vmw_sg_table *vsgt,
 130                  unsigned long num_pages,
 131                  int gmr_id)
 132 {
 133         struct vmw_piter data_iter;
 134
 135         vmw_piter_start(&data_iter, vsgt, 0);
 136
 137         if (unlikely(!vmw_piter_next(&data_iter)))
 138                 return 0;
 139
 140         if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR2)))
 141                 return -EINVAL;
 142
 143         return vmw_gmr2_bind(dev_priv, &data_iter, num_pages, gmr_id);
 144 }
 145
 146
 147 void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
 148 {
 149         if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
 150                 vmw_gmr2_unbind(dev_priv, gmr_id);
 151 }