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      1 /*	$NetBSD: vmwgfx_gmr.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $	*/
      2 
      3 // SPDX-License-Identifier: GPL-2.0 OR MIT
      4 /**************************************************************************
      5  *
      6  * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
      7  *
      8  * Permission is hereby granted, free of charge, to any person obtaining a
      9  * copy of this software and associated documentation files (the
     10  * "Software"), to deal in the Software without restriction, including
     11  * without limitation the rights to use, copy, modify, merge, publish,
     12  * distribute, sub license, and/or sell copies of the Software, and to
     13  * permit persons to whom the Software is furnished to do so, subject to
     14  * the following conditions:
     15  *
     16  * The above copyright notice and this permission notice (including the
     17  * next paragraph) shall be included in all copies or substantial portions
     18  * of the Software.
     19  *
     20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     22  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     23  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     24  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     25  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     26  * USE OR OTHER DEALINGS IN THE SOFTWARE.
     27  *
     28  **************************************************************************/
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: vmwgfx_gmr.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $");
     32 
     33 #include <drm/ttm/ttm_bo_driver.h>
     34 
     35 #include "vmwgfx_drv.h"
     36 
     37 #define VMW_PPN_SIZE (sizeof(unsigned long))
     38 /* A future safe maximum remap size. */
     39 #define VMW_PPN_PER_REMAP ((31 * 1024) / VMW_PPN_SIZE)
     40 #define DMA_ADDR_INVALID ((dma_addr_t) 0)
     41 #define DMA_PAGE_INVALID 0UL
     42 
     43 static int vmw_gmr2_bind(struct vmw_private *dev_priv,
     44 			 struct vmw_piter *iter,
     45 			 unsigned long num_pages,
     46 			 int gmr_id)
     47 {
     48 	SVGAFifoCmdDefineGMR2 define_cmd;
     49 	SVGAFifoCmdRemapGMR2 remap_cmd;
     50 	uint32_t *cmd;
     51 	uint32_t *cmd_orig;
     52 	uint32_t define_size = sizeof(define_cmd) + sizeof(*cmd);
     53 	uint32_t remap_num = num_pages / VMW_PPN_PER_REMAP + ((num_pages % VMW_PPN_PER_REMAP) > 0);
     54 	uint32_t remap_size = VMW_PPN_SIZE * num_pages + (sizeof(remap_cmd) + sizeof(*cmd)) * remap_num;
     55 	uint32_t remap_pos = 0;
     56 	uint32_t cmd_size = define_size + remap_size;
     57 	uint32_t i;
     58 
     59 	cmd_orig = cmd = VMW_FIFO_RESERVE(dev_priv, cmd_size);
     60 	if (unlikely(cmd == NULL))
     61 		return -ENOMEM;
     62 
     63 	define_cmd.gmrId = gmr_id;
     64 	define_cmd.numPages = num_pages;
     65 
     66 	*cmd++ = SVGA_CMD_DEFINE_GMR2;
     67 	memcpy(cmd, &define_cmd, sizeof(define_cmd));
     68 	cmd += sizeof(define_cmd) / sizeof(*cmd);
     69 
     70 	/*
     71 	 * Need to split the command if there are too many
     72 	 * pages that goes into the gmr.
     73 	 */
     74 
     75 	remap_cmd.gmrId = gmr_id;
     76 	remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?
     77 		SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;
     78 
     79 	while (num_pages > 0) {
     80 		unsigned long nr = min(num_pages, (unsigned long)VMW_PPN_PER_REMAP);
     81 
     82 		remap_cmd.offsetPages = remap_pos;
     83 		remap_cmd.numPages = nr;
     84 
     85 		*cmd++ = SVGA_CMD_REMAP_GMR2;
     86 		memcpy(cmd, &remap_cmd, sizeof(remap_cmd));
     87 		cmd += sizeof(remap_cmd) / sizeof(*cmd);
     88 
     89 		for (i = 0; i < nr; ++i) {
     90 			if (VMW_PPN_SIZE <= 4)
     91 				*cmd = vmw_piter_dma_addr(iter) >> PAGE_SHIFT;
     92 			else
     93 				*((uint64_t *)cmd) = vmw_piter_dma_addr(iter) >>
     94 					PAGE_SHIFT;
     95 
     96 			cmd += VMW_PPN_SIZE / sizeof(*cmd);
     97 			vmw_piter_next(iter);
     98 		}
     99 
    100 		num_pages -= nr;
    101 		remap_pos += nr;
    102 	}
    103 
    104 	BUG_ON(cmd != cmd_orig + cmd_size / sizeof(*cmd));
    105 
    106 	vmw_fifo_commit(dev_priv, cmd_size);
    107 
    108 	return 0;
    109 }
    110 
    111 static void vmw_gmr2_unbind(struct vmw_private *dev_priv,
    112 			    int gmr_id)
    113 {
    114 	SVGAFifoCmdDefineGMR2 define_cmd;
    115 	uint32_t define_size = sizeof(define_cmd) + 4;
    116 	uint32_t *cmd;
    117 
    118 	cmd = VMW_FIFO_RESERVE(dev_priv, define_size);
    119 	if (unlikely(cmd == NULL))
    120 		return;
    121 
    122 	define_cmd.gmrId = gmr_id;
    123 	define_cmd.numPages = 0;
    124 
    125 	*cmd++ = SVGA_CMD_DEFINE_GMR2;
    126 	memcpy(cmd, &define_cmd, sizeof(define_cmd));
    127 
    128 	vmw_fifo_commit(dev_priv, define_size);
    129 }
    130 
    131 
    132 int vmw_gmr_bind(struct vmw_private *dev_priv,
    133 		 const struct vmw_sg_table *vsgt,
    134 		 unsigned long num_pages,
    135 		 int gmr_id)
    136 {
    137 	struct vmw_piter data_iter;
    138 
    139 	vmw_piter_start(&data_iter, vsgt, 0);
    140 
    141 	if (unlikely(!vmw_piter_next(&data_iter)))
    142 		return 0;
    143 
    144 	if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR2)))
    145 		return -EINVAL;
    146 
    147 	return vmw_gmr2_bind(dev_priv, &data_iter, num_pages, gmr_id);
    148 }
    149 
    150 
    151 void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
    152 {
    153 	if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
    154 		vmw_gmr2_unbind(dev_priv, gmr_id);
    155 }
    156