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
 33struct svga_3d_compat_cap {
 34	SVGA3dFifoCapsRecordHeader header;
 35	SVGA3dFifoCapPair pairs[SVGA3D_DEVCAP_MAX];
 36};
 37
 38
 39static 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
 55static 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
 85int 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
102void vmw_devcaps_destroy(struct vmw_private *vmw)
103{
104	vfree(vmw->devcaps);
105	vmw->devcaps = NULL;
106}
107
108
109uint32 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
125int 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}