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// SPDX-License-Identifier: GPL-2.0
/*
* APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
*
* Drives the local APIC in "clustered mode".
*/
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <linux/smp.h>
#include <asm/apicdef.h>
#include <asm/fixmap.h>
#include <asm/mpspec.h>
#include <asm/apic.h>
#include <asm/ipi.h>
static unsigned bigsmp_get_apic_id(unsigned long x)
{
return (x >> 24) & 0xFF;
}
static int bigsmp_apic_id_registered(void)
{
return 1;
}
static unsigned long bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
{
return 0;
}
static int bigsmp_early_logical_apicid(int cpu)
{
/* on bigsmp, logical apicid is the same as physical */
return early_per_cpu(x86_cpu_to_apicid, cpu);
}
static inline unsigned long calculate_ldr(int cpu)
{
unsigned long val, id;
val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
id = per_cpu(x86_bios_cpu_apicid, cpu);
val |= SET_APIC_LOGICAL_ID(id);
return val;
}
/*
* Set up the logical destination ID.
*
* Intel recommends to set DFR, LDR and TPR before enabling
* an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
* document number 292116). So here it goes...
*/
static void bigsmp_init_apic_ldr(void)
{
unsigned long val;
int cpu = smp_processor_id();
apic_write(APIC_DFR, APIC_DFR_FLAT);
val = calculate_ldr(cpu);
apic_write(APIC_LDR, val);
}
static void bigsmp_setup_apic_routing(void)
{
printk(KERN_INFO
"Enabling APIC mode: Physflat. Using %d I/O APICs\n",
nr_ioapics);
}
static int bigsmp_cpu_present_to_apicid(int mps_cpu)
{
if (mps_cpu < nr_cpu_ids)
return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
return BAD_APICID;
}
static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
{
/* For clustered we don't have a good way to do this yet - hack */
physids_promote(0xFFL, retmap);
}
static int bigsmp_check_phys_apicid_present(int phys_apicid)
{
return 1;
}
static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
{
return cpuid_apic >> index_msb;
}
static void bigsmp_send_IPI_allbutself(int vector)
{
default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
}
static void bigsmp_send_IPI_all(int vector)
{
default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
}
static int dmi_bigsmp; /* can be set by dmi scanners */
static int hp_ht_bigsmp(const struct dmi_system_id *d)
{
printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
dmi_bigsmp = 1;
return 0;
}
static const struct dmi_system_id bigsmp_dmi_table[] = {
{ hp_ht_bigsmp, "HP ProLiant DL760 G2",
{ DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
}
},
{ hp_ht_bigsmp, "HP ProLiant DL740",
{ DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
}
},
{ } /* NULL entry stops DMI scanning */
};
static int probe_bigsmp(void)
{
if (def_to_bigsmp)
dmi_bigsmp = 1;
else
dmi_check_system(bigsmp_dmi_table);
return dmi_bigsmp;
}
static struct apic apic_bigsmp __ro_after_init = {
.name = "bigsmp",
.probe = probe_bigsmp,
.acpi_madt_oem_check = NULL,
.apic_id_valid = default_apic_id_valid,
.apic_id_registered = bigsmp_apic_id_registered,
.irq_delivery_mode = dest_Fixed,
/* phys delivery to target CPU: */
.irq_dest_mode = 0,
.target_cpus = default_target_cpus,
.disable_esr = 1,
.dest_logical = 0,
.check_apicid_used = bigsmp_check_apicid_used,
.vector_allocation_domain = default_vector_allocation_domain,
.init_apic_ldr = bigsmp_init_apic_ldr,
.ioapic_phys_id_map = bigsmp_ioapic_phys_id_map,
.setup_apic_routing = bigsmp_setup_apic_routing,
.cpu_present_to_apicid = bigsmp_cpu_present_to_apicid,
.apicid_to_cpu_present = physid_set_mask_of_physid,
.check_phys_apicid_present = bigsmp_check_phys_apicid_present,
.phys_pkg_id = bigsmp_phys_pkg_id,
.get_apic_id = bigsmp_get_apic_id,
.set_apic_id = NULL,
.cpu_mask_to_apicid = default_cpu_mask_to_apicid,
.send_IPI = default_send_IPI_single_phys,
.send_IPI_mask = default_send_IPI_mask_sequence_phys,
.send_IPI_mask_allbutself = NULL,
.send_IPI_allbutself = bigsmp_send_IPI_allbutself,
.send_IPI_all = bigsmp_send_IPI_all,
.send_IPI_self = default_send_IPI_self,
.inquire_remote_apic = default_inquire_remote_apic,
.read = native_apic_mem_read,
.write = native_apic_mem_write,
.eoi_write = native_apic_mem_write,
.icr_read = native_apic_icr_read,
.icr_write = native_apic_icr_write,
.wait_icr_idle = native_apic_wait_icr_idle,
.safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
.x86_32_early_logical_apicid = bigsmp_early_logical_apicid,
};
void __init generic_bigsmp_probe(void)
{
unsigned int cpu;
if (!probe_bigsmp())
return;
apic = &apic_bigsmp;
for_each_possible_cpu(cpu) {
if (early_per_cpu(x86_cpu_to_logical_apicid,
cpu) == BAD_APICID)
continue;
early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
bigsmp_early_logical_apicid(cpu);
}
pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
}
apic_driver(apic_bigsmp);
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