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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
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 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
127int 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
146void 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}
1/**************************************************************************
2 *
3 * Copyright © 2009 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 "drmP.h"
30#include "ttm/ttm_bo_driver.h"
31
32/**
33 * FIXME: Adjust to the ttm lowmem / highmem storage to minimize
34 * the number of used descriptors.
35 */
36
37static int vmw_gmr_build_descriptors(struct list_head *desc_pages,
38 struct page *pages[],
39 unsigned long num_pages)
40{
41 struct page *page, *next;
42 struct svga_guest_mem_descriptor *page_virtual = NULL;
43 struct svga_guest_mem_descriptor *desc_virtual = NULL;
44 unsigned int desc_per_page;
45 unsigned long prev_pfn;
46 unsigned long pfn;
47 int ret;
48
49 desc_per_page = PAGE_SIZE /
50 sizeof(struct svga_guest_mem_descriptor) - 1;
51
52 while (likely(num_pages != 0)) {
53 page = alloc_page(__GFP_HIGHMEM);
54 if (unlikely(page == NULL)) {
55 ret = -ENOMEM;
56 goto out_err;
57 }
58
59 list_add_tail(&page->lru, desc_pages);
60
61 /*
62 * Point previous page terminating descriptor to this
63 * page before unmapping it.
64 */
65
66 if (likely(page_virtual != NULL)) {
67 desc_virtual->ppn = page_to_pfn(page);
68 kunmap_atomic(page_virtual, KM_USER0);
69 }
70
71 page_virtual = kmap_atomic(page, KM_USER0);
72 desc_virtual = page_virtual - 1;
73 prev_pfn = ~(0UL);
74
75 while (likely(num_pages != 0)) {
76 pfn = page_to_pfn(*pages);
77
78 if (pfn != prev_pfn + 1) {
79
80 if (desc_virtual - page_virtual ==
81 desc_per_page - 1)
82 break;
83
84 (++desc_virtual)->ppn = cpu_to_le32(pfn);
85 desc_virtual->num_pages = cpu_to_le32(1);
86 } else {
87 uint32_t tmp =
88 le32_to_cpu(desc_virtual->num_pages);
89 desc_virtual->num_pages = cpu_to_le32(tmp + 1);
90 }
91 prev_pfn = pfn;
92 --num_pages;
93 ++pages;
94 }
95
96 (++desc_virtual)->ppn = cpu_to_le32(0);
97 desc_virtual->num_pages = cpu_to_le32(0);
98 }
99
100 if (likely(page_virtual != NULL))
101 kunmap_atomic(page_virtual, KM_USER0);
102
103 return 0;
104out_err:
105 list_for_each_entry_safe(page, next, desc_pages, lru) {
106 list_del_init(&page->lru);
107 __free_page(page);
108 }
109 return ret;
110}
111
112static inline void vmw_gmr_free_descriptors(struct list_head *desc_pages)
113{
114 struct page *page, *next;
115
116 list_for_each_entry_safe(page, next, desc_pages, lru) {
117 list_del_init(&page->lru);
118 __free_page(page);
119 }
120}
121
122static void vmw_gmr_fire_descriptors(struct vmw_private *dev_priv,
123 int gmr_id, struct list_head *desc_pages)
124{
125 struct page *page;
126
127 if (unlikely(list_empty(desc_pages)))
128 return;
129
130 page = list_entry(desc_pages->next, struct page, lru);
131
132 mutex_lock(&dev_priv->hw_mutex);
133
134 vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
135 wmb();
136 vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, page_to_pfn(page));
137 mb();
138
139 mutex_unlock(&dev_priv->hw_mutex);
140
141}
142
143/**
144 * FIXME: Adjust to the ttm lowmem / highmem storage to minimize
145 * the number of used descriptors.
146 */
147
148static unsigned long vmw_gmr_count_descriptors(struct page *pages[],
149 unsigned long num_pages)
150{
151 unsigned long prev_pfn = ~(0UL);
152 unsigned long pfn;
153 unsigned long descriptors = 0;
154
155 while (num_pages--) {
156 pfn = page_to_pfn(*pages++);
157 if (prev_pfn + 1 != pfn)
158 ++descriptors;
159 prev_pfn = pfn;
160 }
161
162 return descriptors;
163}
164
165int vmw_gmr_bind(struct vmw_private *dev_priv,
166 struct page *pages[],
167 unsigned long num_pages,
168 int gmr_id)
169{
170 struct list_head desc_pages;
171 int ret;
172
173 if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR)))
174 return -EINVAL;
175
176 if (vmw_gmr_count_descriptors(pages, num_pages) >
177 dev_priv->max_gmr_descriptors)
178 return -EINVAL;
179
180 INIT_LIST_HEAD(&desc_pages);
181
182 ret = vmw_gmr_build_descriptors(&desc_pages, pages, num_pages);
183 if (unlikely(ret != 0))
184 return ret;
185
186 vmw_gmr_fire_descriptors(dev_priv, gmr_id, &desc_pages);
187 vmw_gmr_free_descriptors(&desc_pages);
188
189 return 0;
190}
191
192
193void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
194{
195 mutex_lock(&dev_priv->hw_mutex);
196 vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
197 wmb();
198 vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, 0);
199 mb();
200 mutex_unlock(&dev_priv->hw_mutex);
201}