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1// SPDX-License-Identifier: GPL-2.0 OR MIT2/**************************************************************************3 *4 * Copyright 2009-2015 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 29#include "vmwgfx_drv.h"30 31#define VMW_PPN_SIZE (sizeof(unsigned long))32/* A future safe maximum remap size. */33#define VMW_PPN_PER_REMAP ((31 * 1024) / VMW_PPN_SIZE)34#define DMA_ADDR_INVALID ((dma_addr_t) 0)35#define DMA_PAGE_INVALID 0UL36 37static int vmw_gmr2_bind(struct vmw_private *dev_priv,38 struct vmw_piter *iter,39 unsigned long num_pages,40 int gmr_id)41{42 SVGAFifoCmdDefineGMR2 define_cmd;43 SVGAFifoCmdRemapGMR2 remap_cmd;44 uint32_t *cmd;45 uint32_t *cmd_orig;46 uint32_t define_size = sizeof(define_cmd) + sizeof(*cmd);47 uint32_t remap_num = num_pages / VMW_PPN_PER_REMAP + ((num_pages % VMW_PPN_PER_REMAP) > 0);48 uint32_t remap_size = VMW_PPN_SIZE * num_pages + (sizeof(remap_cmd) + sizeof(*cmd)) * remap_num;49 uint32_t remap_pos = 0;50 uint32_t cmd_size = define_size + remap_size;51 uint32_t i;52 53 cmd_orig = cmd = VMW_CMD_RESERVE(dev_priv, cmd_size);54 if (unlikely(cmd == NULL))55 return -ENOMEM;56 57 define_cmd.gmrId = gmr_id;58 define_cmd.numPages = num_pages;59 60 *cmd++ = SVGA_CMD_DEFINE_GMR2;61 memcpy(cmd, &define_cmd, sizeof(define_cmd));62 cmd += sizeof(define_cmd) / sizeof(*cmd);63 64 /*65 * Need to split the command if there are too many66 * pages that goes into the gmr.67 */68 69 remap_cmd.gmrId = gmr_id;70 remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?71 SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;72 73 while (num_pages > 0) {74 unsigned long nr = min_t(unsigned long, num_pages, VMW_PPN_PER_REMAP);75 76 remap_cmd.offsetPages = remap_pos;77 remap_cmd.numPages = nr;78 79 *cmd++ = SVGA_CMD_REMAP_GMR2;80 memcpy(cmd, &remap_cmd, sizeof(remap_cmd));81 cmd += sizeof(remap_cmd) / sizeof(*cmd);82 83 for (i = 0; i < nr; ++i) {84 if (VMW_PPN_SIZE <= 4)85 *cmd = vmw_piter_dma_addr(iter) >> PAGE_SHIFT;86 else87 *((uint64_t *)cmd) = vmw_piter_dma_addr(iter) >>88 PAGE_SHIFT;89 90 cmd += VMW_PPN_SIZE / sizeof(*cmd);91 vmw_piter_next(iter);92 }93 94 num_pages -= nr;95 remap_pos += nr;96 }97 98 BUG_ON(cmd != cmd_orig + cmd_size / sizeof(*cmd));99 100 vmw_cmd_commit(dev_priv, cmd_size);101 102 return 0;103}104 105static void vmw_gmr2_unbind(struct vmw_private *dev_priv,106 int gmr_id)107{108 SVGAFifoCmdDefineGMR2 define_cmd;109 uint32_t define_size = sizeof(define_cmd) + 4;110 uint32_t *cmd;111 112 cmd = VMW_CMD_RESERVE(dev_priv, define_size);113 if (unlikely(cmd == NULL))114 return;115 116 define_cmd.gmrId = gmr_id;117 define_cmd.numPages = 0;118 119 *cmd++ = SVGA_CMD_DEFINE_GMR2;120 memcpy(cmd, &define_cmd, sizeof(define_cmd));121 122 vmw_cmd_commit(dev_priv, define_size);123}124 125 126int vmw_gmr_bind(struct vmw_private *dev_priv,127 const struct vmw_sg_table *vsgt,128 unsigned long num_pages,129 int gmr_id)130{131 struct vmw_piter data_iter;132 133 vmw_piter_start(&data_iter, vsgt, 0);134 135 if (unlikely(!vmw_piter_next(&data_iter)))136 return 0;137 138 if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR2)))139 return -EINVAL;140 141 return vmw_gmr2_bind(dev_priv, &data_iter, num_pages, gmr_id);142}143 144 145void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)146{147 if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))148 vmw_gmr2_unbind(dev_priv, gmr_id);149}150