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
106