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x86/apic/uv: Update the UV APIC driver check

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Fix a bug in the OEM check function that determines if the
system is a UV system and the BIOS is compatible with the
kernel's UV apic driver.  This prevents some possibly obscure
panics and guards the system against being started on SGI
hardware that does not have the required kernel support.

Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Hedi Berriche <hedi@sgi.com>
Acked-by: Dimitri Sivanich <sivanich@sgi.com>
Link: http://lkml.kernel.org/r/20150409182629.112998930@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Mike Travis 2015-04-09 13:26:30 -05:00 committed by Ingo Molnar
parent 7a4e017041
commit 379b97e280
1 changed files with 49 additions and 25 deletions
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74
arch/x86/kernel/apic/x2apic_uv_x.c
View file

@ -144,36 +144,60 @@ static void __init uv_set_apicid_hibit(void)
static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
int pnodeid, is_uv1, is_uv2, is_uv3;
int pnodeid;
int uv_apic;
if (strncmp(oem_id, "SGI", 3) != 0)
return 0;
is_uv1 = !strcmp(oem_id, "SGI");
is_uv2 = !strcmp(oem_id, "SGI2");
is_uv3 = !strncmp(oem_id, "SGI3", 4); /* there are varieties of UV3 */
if (is_uv1 || is_uv2 || is_uv3) {
uv_hub_info->hub_revision =
(is_uv1 ? UV1_HUB_REVISION_BASE :
(is_uv2 ? UV2_HUB_REVISION_BASE :
UV3_HUB_REVISION_BASE));
pnodeid = early_get_pnodeid();
early_get_apic_pnode_shift();
x86_platform.is_untracked_pat_range = uv_is_untracked_pat_range;
x86_platform.nmi_init = uv_nmi_init;
if (!strcmp(oem_table_id, "UVL"))
uv_system_type = UV_LEGACY_APIC;
else if (!strcmp(oem_table_id, "UVX"))
uv_system_type = UV_X2APIC;
else if (!strcmp(oem_table_id, "UVH")) {
__this_cpu_write(x2apic_extra_bits,
pnodeid << uvh_apicid.s.pnode_shift);
uv_system_type = UV_NON_UNIQUE_APIC;
uv_set_apicid_hibit();
return 1;
}
/*
* Determine UV arch type.
* SGI: UV100/1000
* SGI2: UV2000/3000
* SGI3: UV300 (truncated to 4 chars because of different varieties)
*/
uv_hub_info->hub_revision =
!strncmp(oem_id, "SGI3", 4) ? UV3_HUB_REVISION_BASE :
!strcmp(oem_id, "SGI2") ? UV2_HUB_REVISION_BASE :
!strcmp(oem_id, "SGI") ? UV1_HUB_REVISION_BASE : 0;
if (uv_hub_info->hub_revision == 0)
goto badbios;
pnodeid = early_get_pnodeid();
early_get_apic_pnode_shift();
x86_platform.is_untracked_pat_range = uv_is_untracked_pat_range;
x86_platform.nmi_init = uv_nmi_init;
if (!strcmp(oem_table_id, "UVX")) { /* most common */
uv_system_type = UV_X2APIC;
uv_apic = 0;
} else if (!strcmp(oem_table_id, "UVH")) { /* only UV1 systems */
uv_system_type = UV_NON_UNIQUE_APIC;
__this_cpu_write(x2apic_extra_bits,
pnodeid << uvh_apicid.s.pnode_shift);
uv_set_apicid_hibit();
uv_apic = 1;
} else if (!strcmp(oem_table_id, "UVL")) { /* only used for */
uv_system_type = UV_LEGACY_APIC; /* very small systems */
uv_apic = 0;
} else {
goto badbios;
}
return 0;
pr_info("UV: OEM IDs %s/%s, System/HUB Types %d/%d, uv_apic %d\n",
oem_id, oem_table_id, uv_system_type,
uv_min_hub_revision_id, uv_apic);
return uv_apic;
badbios:
pr_err("UV: OEM_ID:%s OEM_TABLE_ID:%s\n", oem_id, oem_table_id);
pr_err("Current BIOS not supported, update kernel and/or BIOS\n");
BUG();
}
enum uv_system_type get_uv_system_type(void)