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Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 apic changes from Ingo Molnar:
 "Changes:

   - SGI UV APIC driver updates

   - dead code removal"

* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/apic/uv: Update the UV APIC HUB check
  x86/apic/uv: Update the UV APIC driver check
  x86/apic/uv: Update the APIC UV OEM check
  x86/apic: Remove verify_local_APIC()
This commit is contained in:
Linus Torvalds 2015-04-13 13:15:09 -07:00
commit 977e1ba508
4 changed files with 59 additions and 93 deletions
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1
arch/x86/include/asm/apic.h
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@ -204,7 +204,6 @@ extern void clear_local_APIC(void);
extern void disconnect_bsp_APIC(int virt_wire_setup);
extern void disable_local_APIC(void);
extern void lapic_shutdown(void);
extern int verify_local_APIC(void);
extern void sync_Arb_IDs(void);
extern void init_bsp_APIC(void);
extern void setup_local_APIC(void);

62
arch/x86/kernel/apic/apic.c
View File

@ -1084,67 +1084,6 @@ void lapic_shutdown(void)
local_irq_restore(flags);
}
/*
* This is to verify that we're looking at a real local APIC.
* Check these against your board if the CPUs aren't getting
* started for no apparent reason.
*/
int __init verify_local_APIC(void)
{
unsigned int reg0, reg1;
/*
* The version register is read-only in a real APIC.
*/
reg0 = apic_read(APIC_LVR);
apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0);
apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK);
reg1 = apic_read(APIC_LVR);
apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1);
/*
* The two version reads above should print the same
* numbers. If the second one is different, then we
* poke at a non-APIC.
*/
if (reg1 != reg0)
return 0;
/*
* Check if the version looks reasonably.
*/
reg1 = GET_APIC_VERSION(reg0);
if (reg1 == 0x00 || reg1 == 0xff)
return 0;
reg1 = lapic_get_maxlvt();
if (reg1 < 0x02 || reg1 == 0xff)
return 0;
/*
* The ID register is read/write in a real APIC.
*/
reg0 = apic_read(APIC_ID);
apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0);
apic_write(APIC_ID, reg0 ^ apic->apic_id_mask);
reg1 = apic_read(APIC_ID);
apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1);
apic_write(APIC_ID, reg0);
if (reg1 != (reg0 ^ apic->apic_id_mask))
return 0;
/*
* The next two are just to see if we have sane values.
* They're only really relevant if we're in Virtual Wire
* compatibility mode, but most boxes are anymore.
*/
reg0 = apic_read(APIC_LVT0);
apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0);
reg1 = apic_read(APIC_LVT1);
apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1);
return 1;
}
/**
* sync_Arb_IDs - synchronize APIC bus arbitration IDs
*/
@ -2283,7 +2222,6 @@ int __init APIC_init_uniprocessor(void)
disable_ioapic_support();
default_setup_apic_routing();
verify_local_APIC();
apic_bsp_setup(true);
return 0;
}

87
arch/x86/kernel/apic/x2apic_uv_x.c
View File

@ -144,33 +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;
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;
}
if (strncmp(oem_id, "SGI", 3) != 0)
return 0;
/*
* 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)
@ -854,10 +881,14 @@ void __init uv_system_init(void)
unsigned long mmr_base, present, paddr;
unsigned short pnode_mask;
unsigned char n_lshift;
char *hub = (is_uv1_hub() ? "UV1" :
(is_uv2_hub() ? "UV2" :
"UV3"));
char *hub = (is_uv1_hub() ? "UV100/1000" :
(is_uv2_hub() ? "UV2000/3000" :
(is_uv3_hub() ? "UV300" : NULL)));
if (!hub) {
pr_err("UV: Unknown/unsupported UV hub\n");
return;
}
pr_info("UV: Found %s hub\n", hub);
map_low_mmrs();

2
arch/x86/kernel/smpboot.c
View File

@ -1086,8 +1086,6 @@ static int __init smp_sanity_check(unsigned max_cpus)
return SMP_NO_APIC;
}
verify_local_APIC();
/*
* If SMP should be disabled, then really disable it!
*/