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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quirks.c (2337B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2
      3/*
      4 * Quirks for AMD IOMMU
      5 *
      6 * Copyright (C) 2019 Kai-Heng Feng <kai.heng.feng@canonical.com>
      7 */
      8
      9#ifdef CONFIG_DMI
     10#include <linux/dmi.h>
     11
     12#include "amd_iommu.h"
     13
     14#define IVHD_SPECIAL_IOAPIC		1
     15
     16struct ivrs_quirk_entry {
     17	u8 id;
     18	u32 devid;
     19};
     20
     21enum {
     22	DELL_INSPIRON_7375 = 0,
     23	DELL_LATITUDE_5495,
     24	LENOVO_IDEAPAD_330S_15ARR,
     25};
     26
     27static const struct ivrs_quirk_entry ivrs_ioapic_quirks[][3] __initconst = {
     28	/* ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2 */
     29	[DELL_INSPIRON_7375] = {
     30		{ .id = 4, .devid = 0xa0 },
     31		{ .id = 5, .devid = 0x2 },
     32		{}
     33	},
     34	/* ivrs_ioapic[4]=00:14.0 */
     35	[DELL_LATITUDE_5495] = {
     36		{ .id = 4, .devid = 0xa0 },
     37		{}
     38	},
     39	/* ivrs_ioapic[32]=00:14.0 */
     40	[LENOVO_IDEAPAD_330S_15ARR] = {
     41		{ .id = 32, .devid = 0xa0 },
     42		{}
     43	},
     44	{}
     45};
     46
     47static int __init ivrs_ioapic_quirk_cb(const struct dmi_system_id *d)
     48{
     49	const struct ivrs_quirk_entry *i;
     50
     51	for (i = d->driver_data; i->id != 0 && i->devid != 0; i++)
     52		add_special_device(IVHD_SPECIAL_IOAPIC, i->id, (u32 *)&i->devid, 0);
     53
     54	return 0;
     55}
     56
     57static const struct dmi_system_id ivrs_quirks[] __initconst = {
     58	{
     59		.callback = ivrs_ioapic_quirk_cb,
     60		.ident = "Dell Inspiron 7375",
     61		.matches = {
     62			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
     63			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7375"),
     64		},
     65		.driver_data = (void *)&ivrs_ioapic_quirks[DELL_INSPIRON_7375],
     66	},
     67	{
     68		.callback = ivrs_ioapic_quirk_cb,
     69		.ident = "Dell Latitude 5495",
     70		.matches = {
     71			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
     72			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude 5495"),
     73		},
     74		.driver_data = (void *)&ivrs_ioapic_quirks[DELL_LATITUDE_5495],
     75	},
     76	{
     77		/*
     78		 * Acer Aspire A315-41 requires the very same workaround as
     79		 * Dell Latitude 5495
     80		 */
     81		.callback = ivrs_ioapic_quirk_cb,
     82		.ident = "Acer Aspire A315-41",
     83		.matches = {
     84			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
     85			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire A315-41"),
     86		},
     87		.driver_data = (void *)&ivrs_ioapic_quirks[DELL_LATITUDE_5495],
     88	},
     89	{
     90		.callback = ivrs_ioapic_quirk_cb,
     91		.ident = "Lenovo ideapad 330S-15ARR",
     92		.matches = {
     93			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
     94			DMI_MATCH(DMI_PRODUCT_NAME, "81FB"),
     95		},
     96		.driver_data = (void *)&ivrs_ioapic_quirks[LENOVO_IDEAPAD_330S_15ARR],
     97	},
     98	{}
     99};
    100
    101void __init amd_iommu_apply_ivrs_quirks(void)
    102{
    103	dmi_check_system(ivrs_quirks);
    104}
    105#endif