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