drivers/iommu/amd_iommu_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
  16 struct ivrs_quirk_entry {
  17         u8 id;
  18         u16 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
  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, (u16 *)&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
 101 void __init amd_iommu_apply_ivrs_quirks(void)
 102 {
 103         dmi_check_system(ivrs_quirks);
 104 }
 105 #endif