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1/* SPDX-License-Identifier: GPL-2.0 OR MIT */2/**************************************************************************3 *4 * Copyright 2021 VMware, Inc., Palo Alto, CA., USA5 *6 * Permission is hereby granted, free of charge, to any person obtaining a7 * copy of this software and associated documentation files (the8 * "Software"), to deal in the Software without restriction, including9 * without limitation the rights to use, copy, modify, merge, publish,10 * distribute, sub license, and/or sell copies of the Software, and to11 * permit persons to whom the Software is furnished to do so, subject to12 * the following conditions:13 *14 * The above copyright notice and this permission notice (including the15 * next paragraph) shall be included in all copies or substantial portions16 * of the Software.17 *18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL21 * 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 OR23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE24 * USE OR OTHER DEALINGS IN THE SOFTWARE.25 *26 **************************************************************************/27 28#include <linux/vmalloc.h>29#include "vmwgfx_devcaps.h"30 31#include "vmwgfx_drv.h"32 33 34struct svga_3d_compat_cap {35 SVGA3dFifoCapsRecordHeader header;36 SVGA3dFifoCapPair pairs[SVGA3D_DEVCAP_MAX];37};38 39 40static u32 vmw_mask_legacy_multisample(unsigned int cap, u32 fmt_value)41{42 /*43 * A version of user-space exists which use MULTISAMPLE_MASKABLESAMPLES44 * to check the sample count supported by virtual device. Since there45 * never was support for multisample count for backing MOB return 0.46 *47 * MULTISAMPLE_MASKABLESAMPLES devcap is marked as deprecated by virtual48 * device.49 */50 if (cap == SVGA3D_DEVCAP_DEAD5)51 return 0;52 53 return fmt_value;54}55 56static int vmw_fill_compat_cap(struct vmw_private *dev_priv, void *bounce,57 size_t size)58{59 struct svga_3d_compat_cap *compat_cap =60 (struct svga_3d_compat_cap *) bounce;61 unsigned int i;62 size_t pair_offset = offsetof(struct svga_3d_compat_cap, pairs);63 unsigned int max_size;64 65 if (size < pair_offset)66 return -EINVAL;67 68 max_size = (size - pair_offset) / sizeof(SVGA3dFifoCapPair);69 70 if (max_size > SVGA3D_DEVCAP_MAX)71 max_size = SVGA3D_DEVCAP_MAX;72 73 compat_cap->header.length =74 (pair_offset + max_size * sizeof(SVGA3dFifoCapPair)) / sizeof(u32);75 compat_cap->header.type = SVGA3D_FIFO_CAPS_RECORD_DEVCAPS;76 77 for (i = 0; i < max_size; ++i) {78 compat_cap->pairs[i][0] = i;79 compat_cap->pairs[i][1] = vmw_mask_legacy_multisample80 (i, dev_priv->devcaps[i]);81 }82 83 return 0;84}85 86int vmw_devcaps_create(struct vmw_private *vmw)87{88 bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);89 uint32_t i;90 91 if (gb_objects) {92 vmw->devcaps = vzalloc(sizeof(uint32_t) * SVGA3D_DEVCAP_MAX);93 if (!vmw->devcaps)94 return -ENOMEM;95 for (i = 0; i < SVGA3D_DEVCAP_MAX; ++i) {96 vmw_write(vmw, SVGA_REG_DEV_CAP, i);97 vmw->devcaps[i] = vmw_read(vmw, SVGA_REG_DEV_CAP);98 }99 }100 return 0;101}102 103void vmw_devcaps_destroy(struct vmw_private *vmw)104{105 vfree(vmw->devcaps);106 vmw->devcaps = NULL;107}108 109 110uint32 vmw_devcaps_size(const struct vmw_private *vmw,111 bool gb_aware)112{113 bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);114 if (gb_objects && gb_aware)115 return SVGA3D_DEVCAP_MAX * sizeof(uint32_t);116 else if (gb_objects)117 return sizeof(struct svga_3d_compat_cap) +118 sizeof(uint32_t);119 else if (vmw->fifo_mem != NULL)120 return (SVGA_FIFO_3D_CAPS_LAST - SVGA_FIFO_3D_CAPS + 1) *121 sizeof(uint32_t);122 else123 return 0;124}125 126int vmw_devcaps_copy(struct vmw_private *vmw, bool gb_aware,127 void *dst, uint32_t dst_size)128{129 int ret;130 bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);131 if (gb_objects && gb_aware) {132 memcpy(dst, vmw->devcaps, dst_size);133 } else if (gb_objects) {134 ret = vmw_fill_compat_cap(vmw, dst, dst_size);135 if (unlikely(ret != 0))136 return ret;137 } else if (vmw->fifo_mem) {138 u32 *fifo_mem = vmw->fifo_mem;139 memcpy(dst, &fifo_mem[SVGA_FIFO_3D_CAPS], dst_size);140 } else141 return -EINVAL;142 return 0;143}144