xref: /openbmc/linux/drivers/iommu/amd/quirks.c (revision a45627ba)
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 
16 struct ivrs_quirk_entry {
17 	u8 id;
18 	u32 devid;
19 };
20 
21 enum {
22 	DELL_INSPIRON_7375 = 0,
23 	DELL_LATITUDE_5495,
24 	LENOVO_IDEAPAD_330S_15ARR,
25 };
26 
27 static 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 
ivrs_ioapic_quirk_cb(const struct dmi_system_id * d)47 static 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 
57 static 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 
amd_iommu_apply_ivrs_quirks(void)101 void __init amd_iommu_apply_ivrs_quirks(void)
102 {
103 	dmi_check_system(ivrs_quirks);
104 }
105 #endif
106