| /* |
| * Copyright 2004 James Cleverdon, IBM. |
| * Subject to the GNU Public License, v.2 |
| * |
| * Flat APIC subarch code. |
| * |
| * Hacked for x86-64 by James Cleverdon from i386 architecture code by |
| * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and |
| * James Cleverdon. |
| */ |
| #include <linux/errno.h> |
| #include <linux/threads.h> |
| #include <linux/cpumask.h> |
| #include <linux/string.h> |
| #include <linux/kernel.h> |
| #include <linux/ctype.h> |
| #include <linux/init.h> |
| #include <linux/hardirq.h> |
| #include <asm/smp.h> |
| #include <asm/ipi.h> |
| #include <asm/genapic.h> |
| #include <mach_apicdef.h> |
| |
| #ifdef CONFIG_ACPI |
| #include <acpi/acpi_bus.h> |
| #endif |
| |
| static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) |
| { |
| return 1; |
| } |
| |
| static const struct cpumask *flat_target_cpus(void) |
| { |
| return cpu_online_mask; |
| } |
| |
| static void flat_vector_allocation_domain(int cpu, struct cpumask *retmask) |
| { |
| /* Careful. Some cpus do not strictly honor the set of cpus |
| * specified in the interrupt destination when using lowest |
| * priority interrupt delivery mode. |
| * |
| * In particular there was a hyperthreading cpu observed to |
| * deliver interrupts to the wrong hyperthread when only one |
| * hyperthread was specified in the interrupt desitination. |
| */ |
| cpumask_clear(retmask); |
| cpumask_bits(retmask)[0] = APIC_ALL_CPUS; |
| } |
| |
| /* |
| * 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 flat_init_apic_ldr(void) |
| { |
| unsigned long val; |
| unsigned long num, id; |
| |
| num = smp_processor_id(); |
| id = 1UL << num; |
| apic_write(APIC_DFR, APIC_DFR_FLAT); |
| val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; |
| val |= SET_APIC_LOGICAL_ID(id); |
| apic_write(APIC_LDR, val); |
| } |
| |
| static inline void _flat_send_IPI_mask(unsigned long mask, int vector) |
| { |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| __send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL); |
| local_irq_restore(flags); |
| } |
| |
| static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector) |
| { |
| unsigned long mask = cpumask_bits(cpumask)[0]; |
| |
| _flat_send_IPI_mask(mask, vector); |
| } |
| |
| static void flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, |
| int vector) |
| { |
| unsigned long mask = cpumask_bits(cpumask)[0]; |
| int cpu = smp_processor_id(); |
| |
| if (cpu < BITS_PER_LONG) |
| clear_bit(cpu, &mask); |
| _flat_send_IPI_mask(mask, vector); |
| } |
| |
| static void flat_send_IPI_allbutself(int vector) |
| { |
| int cpu = smp_processor_id(); |
| #ifdef CONFIG_HOTPLUG_CPU |
| int hotplug = 1; |
| #else |
| int hotplug = 0; |
| #endif |
| if (hotplug || vector == NMI_VECTOR) { |
| if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) { |
| unsigned long mask = cpumask_bits(cpu_online_mask)[0]; |
| |
| if (cpu < BITS_PER_LONG) |
| clear_bit(cpu, &mask); |
| |
| _flat_send_IPI_mask(mask, vector); |
| } |
| } else if (num_online_cpus() > 1) { |
| __send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL); |
| } |
| } |
| |
| static void flat_send_IPI_all(int vector) |
| { |
| if (vector == NMI_VECTOR) |
| flat_send_IPI_mask(cpu_online_mask, vector); |
| else |
| __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL); |
| } |
| |
| static unsigned int get_apic_id(unsigned long x) |
| { |
| unsigned int id; |
| |
| id = (((x)>>24) & 0xFFu); |
| return id; |
| } |
| |
| static unsigned long set_apic_id(unsigned int id) |
| { |
| unsigned long x; |
| |
| x = ((id & 0xFFu)<<24); |
| return x; |
| } |
| |
| static unsigned int read_xapic_id(void) |
| { |
| unsigned int id; |
| |
| id = get_apic_id(apic_read(APIC_ID)); |
| return id; |
| } |
| |
| static int flat_apic_id_registered(void) |
| { |
| return physid_isset(read_xapic_id(), phys_cpu_present_map); |
| } |
| |
| static unsigned int flat_cpu_mask_to_apicid(const struct cpumask *cpumask) |
| { |
| return cpumask_bits(cpumask)[0] & APIC_ALL_CPUS; |
| } |
| |
| static unsigned int flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask, |
| const struct cpumask *andmask) |
| { |
| unsigned long mask1 = cpumask_bits(cpumask)[0] & APIC_ALL_CPUS; |
| unsigned long mask2 = cpumask_bits(andmask)[0] & APIC_ALL_CPUS; |
| |
| return mask1 & mask2; |
| } |
| |
| static unsigned int phys_pkg_id(int index_msb) |
| { |
| return hard_smp_processor_id() >> index_msb; |
| } |
| |
| struct genapic apic_flat = { |
| .name = "flat", |
| .acpi_madt_oem_check = flat_acpi_madt_oem_check, |
| .int_delivery_mode = dest_LowestPrio, |
| .int_dest_mode = (APIC_DEST_LOGICAL != 0), |
| .target_cpus = flat_target_cpus, |
| .vector_allocation_domain = flat_vector_allocation_domain, |
| .apic_id_registered = flat_apic_id_registered, |
| .init_apic_ldr = flat_init_apic_ldr, |
| .send_IPI_all = flat_send_IPI_all, |
| .send_IPI_allbutself = flat_send_IPI_allbutself, |
| .send_IPI_mask = flat_send_IPI_mask, |
| .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself, |
| .send_IPI_self = apic_send_IPI_self, |
| .cpu_mask_to_apicid = flat_cpu_mask_to_apicid, |
| .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and, |
| .phys_pkg_id = phys_pkg_id, |
| .get_apic_id = get_apic_id, |
| .set_apic_id = set_apic_id, |
| .apic_id_mask = (0xFFu<<24), |
| }; |
| |
| /* |
| * Physflat mode is used when there are more than 8 CPUs on a AMD system. |
| * We cannot use logical delivery in this case because the mask |
| * overflows, so use physical mode. |
| */ |
| static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) |
| { |
| #ifdef CONFIG_ACPI |
| /* |
| * Quirk: some x86_64 machines can only use physical APIC mode |
| * regardless of how many processors are present (x86_64 ES7000 |
| * is an example). |
| */ |
| if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID && |
| (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { |
| printk(KERN_DEBUG "system APIC only can use physical flat"); |
| return 1; |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| static const struct cpumask *physflat_target_cpus(void) |
| { |
| return cpu_online_mask; |
| } |
| |
| static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask) |
| { |
| cpumask_clear(retmask); |
| cpumask_set_cpu(cpu, retmask); |
| } |
| |
| static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector) |
| { |
| send_IPI_mask_sequence(cpumask, vector); |
| } |
| |
| static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask, |
| int vector) |
| { |
| send_IPI_mask_allbutself(cpumask, vector); |
| } |
| |
| static void physflat_send_IPI_allbutself(int vector) |
| { |
| send_IPI_mask_allbutself(cpu_online_mask, vector); |
| } |
| |
| static void physflat_send_IPI_all(int vector) |
| { |
| physflat_send_IPI_mask(cpu_online_mask, vector); |
| } |
| |
| static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask) |
| { |
| int cpu; |
| |
| /* |
| * We're using fixed IRQ delivery, can only return one phys APIC ID. |
| * May as well be the first. |
| */ |
| cpu = cpumask_first(cpumask); |
| if ((unsigned)cpu < nr_cpu_ids) |
| return per_cpu(x86_cpu_to_apicid, cpu); |
| else |
| return BAD_APICID; |
| } |
| |
| static unsigned int |
| physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask, |
| const struct cpumask *andmask) |
| { |
| int cpu; |
| |
| /* |
| * We're using fixed IRQ delivery, can only return one phys APIC ID. |
| * May as well be the first. |
| */ |
| for_each_cpu_and(cpu, cpumask, andmask) |
| if (cpumask_test_cpu(cpu, cpu_online_mask)) |
| break; |
| if (cpu < nr_cpu_ids) |
| return per_cpu(x86_cpu_to_apicid, cpu); |
| return BAD_APICID; |
| } |
| |
| struct genapic apic_physflat = { |
| .name = "physical flat", |
| .acpi_madt_oem_check = physflat_acpi_madt_oem_check, |
| .int_delivery_mode = dest_Fixed, |
| .int_dest_mode = (APIC_DEST_PHYSICAL != 0), |
| .target_cpus = physflat_target_cpus, |
| .vector_allocation_domain = physflat_vector_allocation_domain, |
| .apic_id_registered = flat_apic_id_registered, |
| .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/ |
| .send_IPI_all = physflat_send_IPI_all, |
| .send_IPI_allbutself = physflat_send_IPI_allbutself, |
| .send_IPI_mask = physflat_send_IPI_mask, |
| .send_IPI_mask_allbutself = physflat_send_IPI_mask_allbutself, |
| .send_IPI_self = apic_send_IPI_self, |
| .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid, |
| .cpu_mask_to_apicid_and = physflat_cpu_mask_to_apicid_and, |
| .phys_pkg_id = phys_pkg_id, |
| .get_apic_id = get_apic_id, |
| .set_apic_id = set_apic_id, |
| .apic_id_mask = (0xFFu<<24), |
| }; |