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vmwgfx_gmr.c revision 1.1.1.2 
      1 /**************************************************************************
      2  *
      3  * Copyright  2009-2011 VMware, Inc., Palo Alto, CA., USA
      4  * All Rights Reserved.
      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_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 
     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 		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 
    128 int 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 
    147 void 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