cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

ast_mm.c (2670B)

      1/*
      2 * Copyright 2012 Red Hat Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the
      6 * "Software"), to deal in the Software without restriction, including
      7 * without limitation the rights to use, copy, modify, merge, publish,
      8 * distribute, sub license, and/or sell copies of the Software, and to
      9 * permit persons to whom the Software is furnished to do so, subject to
     10 * the following conditions:
     11 *
     12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     18 * USE OR OTHER DEALINGS IN THE SOFTWARE.
     19 *
     20 * The above copyright notice and this permission notice (including the
     21 * next paragraph) shall be included in all copies or substantial portions
     22 * of the Software.
     23 *
     24 */
     25/*
     26 * Authors: Dave Airlie <airlied@redhat.com>
     27 */
     28
     29#include <linux/pci.h>
     30
     31#include <drm/drm_gem_vram_helper.h>
     32#include <drm/drm_managed.h>
     33#include <drm/drm_print.h>
     34
     35#include "ast_drv.h"
     36
     37static u32 ast_get_vram_size(struct ast_private *ast)
     38{
     39	u8 jreg;
     40	u32 vram_size;
     41
     42	ast_open_key(ast);
     43
     44	vram_size = AST_VIDMEM_DEFAULT_SIZE;
     45	jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
     46	switch (jreg & 3) {
     47	case 0:
     48		vram_size = AST_VIDMEM_SIZE_8M;
     49		break;
     50	case 1:
     51		vram_size = AST_VIDMEM_SIZE_16M;
     52		break;
     53	case 2:
     54		vram_size = AST_VIDMEM_SIZE_32M;
     55		break;
     56	case 3:
     57		vram_size = AST_VIDMEM_SIZE_64M;
     58		break;
     59	}
     60
     61	jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x99, 0xff);
     62	switch (jreg & 0x03) {
     63	case 1:
     64		vram_size -= 0x100000;
     65		break;
     66	case 2:
     67		vram_size -= 0x200000;
     68		break;
     69	case 3:
     70		vram_size -= 0x400000;
     71		break;
     72	}
     73
     74	return vram_size;
     75}
     76
     77int ast_mm_init(struct ast_private *ast)
     78{
     79	struct drm_device *dev = &ast->base;
     80	struct pci_dev *pdev = to_pci_dev(dev->dev);
     81	resource_size_t base, size;
     82	u32 vram_size;
     83	int ret;
     84
     85	base = pci_resource_start(pdev, 0);
     86	size = pci_resource_len(pdev, 0);
     87
     88	/* Don't fail on errors, but performance might be reduced. */
     89	devm_arch_io_reserve_memtype_wc(dev->dev, base, size);
     90	devm_arch_phys_wc_add(dev->dev, base, size);
     91
     92	vram_size = ast_get_vram_size(ast);
     93
     94	ret = drmm_vram_helper_init(dev, base, vram_size);
     95	if (ret) {
     96		drm_err(dev, "Error initializing VRAM MM; %d\n", ret);
     97		return ret;
     98	}
     99
    100	return 0;
    101}