LXR linux/drivers/gpu/drm/vmwgfx/vmwgfx

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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
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  11 * permit persons to whom the Software is furnished to do so, subject to
  12 * the following conditions:
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  15 * next paragraph) shall be included in all copies or substantial portions
  16 * of the Software.
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  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
  38static 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
 106static 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
 128int 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
 147void 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}
 152