1 // SPDX-License-Identifier: GPL-2.0 OR MIT 2 /************************************************************************** 3 * 4 * Copyright 2009-2015 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 <drm/ttm/ttm_bo_driver.h> 29 30 #include "vmwgfx_drv.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 return; 116 117 define_cmd.gmrId = gmr_id; 118 define_cmd.numPages = 0; 119 120 *cmd++ = SVGA_CMD_DEFINE_GMR2; 121 memcpy(cmd, &define_cmd, sizeof(define_cmd)); 122 123 vmw_fifo_commit(dev_priv, define_size); 124 } 125 126 127 int vmw_gmr_bind(struct vmw_private *dev_priv, 128 const struct vmw_sg_table *vsgt, 129 unsigned long num_pages, 130 int gmr_id) 131 { 132 struct vmw_piter data_iter; 133 134 vmw_piter_start(&data_iter, vsgt, 0); 135 136 if (unlikely(!vmw_piter_next(&data_iter))) 137 return 0; 138 139 if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR2))) 140 return -EINVAL; 141 142 return vmw_gmr2_bind(dev_priv, &data_iter, num_pages, gmr_id); 143 } 144 145 146 void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id) 147 { 148 if (likely(dev_priv->capabilities & SVGA_CAP_GMR2)) 149 vmw_gmr2_unbind(dev_priv, gmr_id); 150 } 151