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
38static 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
106static 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
128int 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
147void 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