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#ifndef __ASM_SUMMIT_APIC_H
#define __ASM_SUMMIT_APIC_H
#include <asm/smp.h>
#include <linux/gfp.h>
/* In clustered mode, the high nibble of APIC ID is a cluster number.
* The low nibble is a 4-bit bitmap. */
#define XAPIC_DEST_CPUS_SHIFT 4
#define XAPIC_DEST_CPUS_MASK ((1u << XAPIC_DEST_CPUS_SHIFT) - 1)
#define XAPIC_DEST_CLUSTER_MASK (XAPIC_DEST_CPUS_MASK << XAPIC_DEST_CPUS_SHIFT)
#define APIC_DFR_VALUE (APIC_DFR_CLUSTER)
static inline const cpumask_t *summit_target_cpus(void)
{
/* CPU_MASK_ALL (0xff) has undefined behaviour with
* dest_LowestPrio mode logical clustered apic interrupt routing
* Just start on cpu 0. IRQ balancing will spread load
*/
return &cpumask_of_cpu(0);
}
static inline unsigned long
summit_check_apicid_used(physid_mask_t bitmap, int apicid)
{
return 0;
}
/* we don't use the phys_cpu_present_map to indicate apicid presence */
static inline unsigned long summit_check_apicid_present(int bit)
{
return 1;
}
#define apicid_cluster(apicid) ((apicid) & XAPIC_DEST_CLUSTER_MASK)
extern u8 cpu_2_logical_apicid[];
static inline void summit_init_apic_ldr(void)
{
unsigned long val, id;
int count = 0;
u8 my_id = (u8)hard_smp_processor_id();
u8 my_cluster = (u8)apicid_cluster(my_id);
#ifdef CONFIG_SMP
u8 lid;
int i;
/* Create logical APIC IDs by counting CPUs already in cluster. */
for (count = 0, i = nr_cpu_ids; --i >= 0; ) {
lid = cpu_2_logical_apicid[i];
if (lid != BAD_APICID && apicid_cluster(lid) == my_cluster)
++count;
}
#endif
/* We only have a 4 wide bitmap in cluster mode. If a deranged
* BIOS puts 5 CPUs in one APIC cluster, we're hosed. */
BUG_ON(count >= XAPIC_DEST_CPUS_SHIFT);
id = my_cluster | (1UL << count);
apic_write(APIC_DFR, APIC_DFR_VALUE);
val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
val |= SET_APIC_LOGICAL_ID(id);
apic_write(APIC_LDR, val);
}
static inline int summit_apic_id_registered(void)
{
return 1;
}
static inline void summit_setup_apic_routing(void)
{
printk("Enabling APIC mode: Summit. Using %d I/O APICs\n",
nr_ioapics);
}
static inline int summit_apicid_to_node(int logical_apicid)
{
#ifdef CONFIG_SMP
return apicid_2_node[hard_smp_processor_id()];
#else
return 0;
#endif
}
/* Mapping from cpu number to logical apicid */
static inline int summit_cpu_to_logical_apicid(int cpu)
{
#ifdef CONFIG_SMP
if (cpu >= nr_cpu_ids)
return BAD_APICID;
return (int)cpu_2_logical_apicid[cpu];
#else
return logical_smp_processor_id();
#endif
}
static inline int summit_cpu_present_to_apicid(int mps_cpu)
{
if (mps_cpu < nr_cpu_ids)
return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
else
return BAD_APICID;
}
static inline physid_mask_t
summit_ioapic_phys_id_map(physid_mask_t phys_id_map)
{
/* For clustered we don't have a good way to do this yet - hack */
return physids_promote(0x0F);
}
static inline physid_mask_t summit_apicid_to_cpu_present(int apicid)
{
return physid_mask_of_physid(0);
}
static inline void summit_setup_portio_remap(void)
{
}
static inline int summit_check_phys_apicid_present(int boot_cpu_physical_apicid)
{
return 1;
}
static inline unsigned int cpu_mask_to_apicid(const cpumask_t *cpumask)
{
int num_bits_set;
int cpus_found = 0;
int cpu;
int apicid;
num_bits_set = cpus_weight(*cpumask);
/* Return id to all */
if (num_bits_set >= nr_cpu_ids)
return (int) 0xFF;
/*
* The cpus in the mask must all be on the apic cluster. If are not
* on the same apicid cluster return default value of target_cpus():
*/
cpu = first_cpu(*cpumask);
apicid = summit_cpu_to_logical_apicid(cpu);
while (cpus_found < num_bits_set) {
if (cpu_isset(cpu, *cpumask)) {
int new_apicid = summit_cpu_to_logical_apicid(cpu);
if (apicid_cluster(apicid) !=
apicid_cluster(new_apicid)){
printk ("%s: Not a valid mask!\n", __func__);
return 0xFF;
}
apicid = apicid | new_apicid;
cpus_found++;
}
cpu++;
}
return apicid;
}
static inline unsigned int cpu_mask_to_apicid_and(const struct cpumask *inmask,
const struct cpumask *andmask)
{
int apicid = summit_cpu_to_logical_apicid(0);
cpumask_var_t cpumask;
if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
return apicid;
cpumask_and(cpumask, inmask, andmask);
cpumask_and(cpumask, cpumask, cpu_online_mask);
apicid = cpu_mask_to_apicid(cpumask);
free_cpumask_var(cpumask);
return apicid;
}
/*
* cpuid returns the value latched in the HW at reset, not the APIC ID
* register's value. For any box whose BIOS changes APIC IDs, like
* clustered APIC systems, we must use hard_smp_processor_id.
*
* See Intel's IA-32 SW Dev's Manual Vol2 under CPUID.
*/
static inline int summit_phys_pkg_id(int cpuid_apic, int index_msb)
{
return hard_smp_processor_id() >> index_msb;
}
#endif /* __ASM_SUMMIT_APIC_H */
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