cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vmwgfx_devcaps.c (4272B)

      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}