1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
2 /**************************************************************************
3  *
4  * Copyright 2021 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 "vmwgfx_devcaps.h"
29 
30 #include "vmwgfx_drv.h"
31 
32 
33 struct svga_3d_compat_cap {
34 	SVGA3dFifoCapsRecordHeader header;
35 	SVGA3dFifoCapPair pairs[SVGA3D_DEVCAP_MAX];
36 };
37 
38 
39 static u32 vmw_mask_legacy_multisample(unsigned int cap, u32 fmt_value)
40 {
41 	/*
42 	 * A version of user-space exists which use MULTISAMPLE_MASKABLESAMPLES
43 	 * to check the sample count supported by virtual device. Since there
44 	 * never was support for multisample count for backing MOB return 0.
45 	 *
46 	 * MULTISAMPLE_MASKABLESAMPLES devcap is marked as deprecated by virtual
47 	 * device.
48 	 */
49 	if (cap == SVGA3D_DEVCAP_DEAD5)
50 		return 0;
51 
52 	return fmt_value;
53 }
54 
55 static int vmw_fill_compat_cap(struct vmw_private *dev_priv, void *bounce,
56 			       size_t size)
57 {
58 	struct svga_3d_compat_cap *compat_cap =
59 		(struct svga_3d_compat_cap *) bounce;
60 	unsigned int i;
61 	size_t pair_offset = offsetof(struct svga_3d_compat_cap, pairs);
62 	unsigned int max_size;
63 
64 	if (size < pair_offset)
65 		return -EINVAL;
66 
67 	max_size = (size - pair_offset) / sizeof(SVGA3dFifoCapPair);
68 
69 	if (max_size > SVGA3D_DEVCAP_MAX)
70 		max_size = SVGA3D_DEVCAP_MAX;
71 
72 	compat_cap->header.length =
73 		(pair_offset + max_size * sizeof(SVGA3dFifoCapPair)) / sizeof(u32);
74 	compat_cap->header.type = SVGA3D_FIFO_CAPS_RECORD_DEVCAPS;
75 
76 	for (i = 0; i < max_size; ++i) {
77 		compat_cap->pairs[i][0] = i;
78 		compat_cap->pairs[i][1] = vmw_mask_legacy_multisample
79 			(i, dev_priv->devcaps[i]);
80 	}
81 
82 	return 0;
83 }
84 
85 int vmw_devcaps_create(struct vmw_private *vmw)
86 {
87 	bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);
88 	uint32_t i;
89 
90 	if (gb_objects) {
91 		vmw->devcaps = vzalloc(sizeof(uint32_t) * SVGA3D_DEVCAP_MAX);
92 		if (!vmw->devcaps)
93 			return -ENOMEM;
94 		for (i = 0; i < SVGA3D_DEVCAP_MAX; ++i) {
95 			vmw_write(vmw, SVGA_REG_DEV_CAP, i);
96 			vmw->devcaps[i] = vmw_read(vmw, SVGA_REG_DEV_CAP);
97 		}
98 	}
99 	return 0;
100 }
101 
102 void vmw_devcaps_destroy(struct vmw_private *vmw)
103 {
104 	vfree(vmw->devcaps);
105 	vmw->devcaps = NULL;
106 }
107 
108 
109 uint32 vmw_devcaps_size(const struct vmw_private *vmw,
110 			bool gb_aware)
111 {
112 	bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);
113 	if (gb_objects && gb_aware)
114 		return SVGA3D_DEVCAP_MAX * sizeof(uint32_t);
115 	else if (gb_objects)
116 		return  sizeof(struct svga_3d_compat_cap) +
117 				sizeof(uint32_t);
118 	else if (vmw->fifo_mem != NULL)
119 		return (SVGA_FIFO_3D_CAPS_LAST - SVGA_FIFO_3D_CAPS + 1) *
120 				sizeof(uint32_t);
121 	else
122 		return 0;
123 }
124 
125 int vmw_devcaps_copy(struct vmw_private *vmw, bool gb_aware,
126 		     void *dst, uint32_t dst_size)
127 {
128 	int ret;
129 	bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);
130 	if (gb_objects && gb_aware) {
131 		memcpy(dst, vmw->devcaps, dst_size);
132 	} else if (gb_objects) {
133 		ret = vmw_fill_compat_cap(vmw, dst, dst_size);
134 		if (unlikely(ret != 0))
135 			return ret;
136 	} else if (vmw->fifo_mem) {
137 		u32 *fifo_mem = vmw->fifo_mem;
138 		memcpy(dst, &fifo_mem[SVGA_FIFO_3D_CAPS], dst_size);
139 	} else
140 		return -EINVAL;
141 	return 0;
142 }
143