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| author | Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> | 2016-04-01 09:06:01 -0400 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2016-04-07 13:29:41 +0200 |
| commit | ca3bf5d47cec8b7614bcb2e9132c40081d6d81db (patch) | |
| tree | 3ab1b984c7780ad3bfce7b5636693f3edd91025b /drivers/iommu | |
| parent | 2a0cb4e2d423c8aeafa79945279246f6b35ea8cf (diff) | |
| download | blackbird-obmc-linux-ca3bf5d47cec8b7614bcb2e9132c40081d6d81db.tar.gz blackbird-obmc-linux-ca3bf5d47cec8b7614bcb2e9132c40081d6d81db.zip | |
iommu/amd: Introduces ivrs_acpihid kernel parameter
This patch introduces a new kernel parameter, ivrs_acpihid.
This is used to override existing ACPI-HID IVHD device entry,
or add an entry in case it is missing in the IVHD.
Signed-off-by: Wan Zongshun <Vincent.Wan@amd.com>
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index e7ebfa2a6c2c..9e0034196e10 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -2477,10 +2477,43 @@ static int __init parse_ivrs_hpet(char *str) return 1; } +static int __init parse_ivrs_acpihid(char *str) +{ + u32 bus, dev, fn; + char *hid, *uid, *p; + char acpiid[ACPIHID_UID_LEN + ACPIHID_HID_LEN] = {0}; + int ret, i; + + ret = sscanf(str, "[%x:%x.%x]=%s", &bus, &dev, &fn, acpiid); + if (ret != 4) { + pr_err("AMD-Vi: Invalid command line: ivrs_acpihid(%s)\n", str); + return 1; + } + + p = acpiid; + hid = strsep(&p, ":"); + uid = p; + + if (!hid || !(*hid) || !uid) { + pr_err("AMD-Vi: Invalid command line: hid or uid\n"); + return 1; + } + + i = early_acpihid_map_size++; + memcpy(early_acpihid_map[i].hid, hid, strlen(hid)); + memcpy(early_acpihid_map[i].uid, uid, strlen(uid)); + early_acpihid_map[i].devid = + ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7); + early_acpihid_map[i].cmd_line = true; + + return 1; +} + __setup("amd_iommu_dump", parse_amd_iommu_dump); __setup("amd_iommu=", parse_amd_iommu_options); __setup("ivrs_ioapic", parse_ivrs_ioapic); __setup("ivrs_hpet", parse_ivrs_hpet); +__setup("ivrs_acpihid", parse_ivrs_acpihid); IOMMU_INIT_FINISH(amd_iommu_detect, gart_iommu_hole_init, |
