quirks.c

  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