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

   1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2/**************************************************************************
   3 *
   4 * Copyright 2021 VMware, Inc., Palo Alto, CA., USA
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a
   7 * copy of this software and associated documentation files (the
   8 * "Software"), to deal in the Software without restriction, including
   9 * without limitation the rights to use, copy, modify, merge, publish,
  10 * distribute, sub license, and/or sell copies of the Software, and to
  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
  19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25 *
  26 **************************************************************************/
  27
  28#include "vmwgfx_devcaps.h"
  29
  30#include "vmwgfx_drv.h"
  31
  32
  33struct svga_3d_compat_cap {
  34        SVGA3dFifoCapsRecordHeader header;
  35        SVGA3dFifoCapPair pairs[SVGA3D_DEVCAP_MAX];
  36};
  37
  38
  39static u32 vmw_mask_legacy_multisample(unsigned int cap, u32 fmt_value)
  40{
  41        /*
  42         * A version of user-space exists which use MULTISAMPLE_MASKABLESAMPLES
  43         * to check the sample count supported by virtual device. Since there
  44         * never was support for multisample count for backing MOB return 0.
  45         *
  46         * MULTISAMPLE_MASKABLESAMPLES devcap is marked as deprecated by virtual
  47         * device.
  48         */
  49        if (cap == SVGA3D_DEVCAP_DEAD5)
  50                return 0;
  51
  52        return fmt_value;
  53}
  54
  55static int vmw_fill_compat_cap(struct vmw_private *dev_priv, void *bounce,
  56                               size_t size)
  57{
  58        struct svga_3d_compat_cap *compat_cap =
  59                (struct svga_3d_compat_cap *) bounce;
  60        unsigned int i;
  61        size_t pair_offset = offsetof(struct svga_3d_compat_cap, pairs);
  62        unsigned int max_size;
  63
  64        if (size < pair_offset)
  65                return -EINVAL;
  66
  67        max_size = (size - pair_offset) / sizeof(SVGA3dFifoCapPair);
  68
  69        if (max_size > SVGA3D_DEVCAP_MAX)
  70                max_size = SVGA3D_DEVCAP_MAX;
  71
  72        compat_cap->header.length =
  73                (pair_offset + max_size * sizeof(SVGA3dFifoCapPair)) / sizeof(u32);
  74        compat_cap->header.type = SVGA3D_FIFO_CAPS_RECORD_DEVCAPS;
  75
  76        for (i = 0; i < max_size; ++i) {
  77                compat_cap->pairs[i][0] = i;
  78                compat_cap->pairs[i][1] = vmw_mask_legacy_multisample
  79                        (i, dev_priv->devcaps[i]);
  80        }
  81
  82        return 0;
  83}
  84
  85int vmw_devcaps_create(struct vmw_private *vmw)
  86{
  87        bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);
  88        uint32_t i;
  89
  90        if (gb_objects) {
  91                vmw->devcaps = vzalloc(sizeof(uint32_t) * SVGA3D_DEVCAP_MAX);
  92                if (!vmw->devcaps)
  93                        return -ENOMEM;
  94                for (i = 0; i < SVGA3D_DEVCAP_MAX; ++i) {
  95                        vmw_write(vmw, SVGA_REG_DEV_CAP, i);
  96                        vmw->devcaps[i] = vmw_read(vmw, SVGA_REG_DEV_CAP);
  97                }
  98        }
  99        return 0;
 100}
 101
 102void vmw_devcaps_destroy(struct vmw_private *vmw)
 103{
 104        vfree(vmw->devcaps);
 105        vmw->devcaps = NULL;
 106}
 107
 108
 109uint32 vmw_devcaps_size(const struct vmw_private *vmw,
 110                        bool gb_aware)
 111{
 112        bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);
 113        if (gb_objects && gb_aware)
 114                return SVGA3D_DEVCAP_MAX * sizeof(uint32_t);
 115        else if (gb_objects)
 116                return  sizeof(struct svga_3d_compat_cap) +
 117                                sizeof(uint32_t);
 118        else if (vmw->fifo_mem != NULL)
 119                return (SVGA_FIFO_3D_CAPS_LAST - SVGA_FIFO_3D_CAPS + 1) *
 120                                sizeof(uint32_t);
 121        else
 122                return 0;
 123}
 124
 125int vmw_devcaps_copy(struct vmw_private *vmw, bool gb_aware,
 126                     void *dst, uint32_t dst_size)
 127{
 128        int ret;
 129        bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);
 130        if (gb_objects && gb_aware) {
 131                memcpy(dst, vmw->devcaps, dst_size);
 132        } else if (gb_objects) {
 133                ret = vmw_fill_compat_cap(vmw, dst, dst_size);
 134                if (unlikely(ret != 0))
 135                        return ret;
 136        } else if (vmw->fifo_mem) {
 137                u32 *fifo_mem = vmw->fifo_mem;
 138                memcpy(dst, &fifo_mem[SVGA_FIFO_3D_CAPS], dst_size);
 139        } else
 140                return -EINVAL;
 141        return 0;
 142}
 143