Commit f13c13a0 authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt

powerpc: Stop using non-architected shared_proc field in lppaca

Although the shared_proc field in the lppaca works today, it is
not architected. A shared processor partition will always have a non
zero yield_count so use that instead. Create a wrapper so users
don't have to know about the details.

In order for older kernels to continue to work on KVM we need
to set the shared_proc bit. While here, remove the ugly bitfield.
Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 0c69f9c5
......@@ -50,10 +50,8 @@ struct lppaca {
u32 desc; /* Eye catcher 0xD397D781 */
u16 size; /* Size of this struct */
u16 reserved1;
u16 reserved2:14;
u8 shared_proc:1; /* Shared processor indicator */
u8 secondary_thread:1; /* Secondary thread indicator */
u8 reserved1[3];
u8 __old_status; /* Old status, including shared proc */
u8 reserved3[14];
volatile u32 dyn_hw_node_id; /* Dynamic hardware node id */
volatile u32 dyn_hw_proc_id; /* Dynamic hardware proc id */
......@@ -107,6 +105,18 @@ extern struct lppaca lppaca[];
#define lppaca_of(cpu) (*paca[cpu].lppaca_ptr)
/*
* Old kernels used a reserved bit in the VPA to determine if it was running
* in shared processor mode. New kernels look for a non zero yield count
* but KVM still needs to set the bit to keep the old stuff happy.
*/
#define LPPACA_OLD_SHARED_PROC 2
static inline bool lppaca_shared_proc(struct lppaca *l)
{
return l->yield_count != 0;
}
/*
* SLB shadow buffer structure as defined in the PAPR. The save_area
* contains adjacent ESID and VSID pairs for each shadowed SLB. The
......
......@@ -96,7 +96,7 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock)
#if defined(CONFIG_PPC_SPLPAR)
/* We only yield to the hypervisor if we are in shared processor mode */
#define SHARED_PROCESSOR (local_paca->lppaca_ptr->shared_proc)
#define SHARED_PROCESSOR (lppaca_shared_proc(local_paca->lppaca_ptr))
extern void __spin_yield(arch_spinlock_t *lock);
extern void __rw_yield(arch_rwlock_t *lock);
#else /* SPLPAR */
......
......@@ -165,7 +165,7 @@ static void parse_ppp_data(struct seq_file *m)
ppp_data.active_system_procs);
/* pool related entries are appropriate for shared configs */
if (lppaca_of(0).shared_proc) {
if (lppaca_shared_proc(get_lppaca())) {
unsigned long pool_idle_time, pool_procs;
seq_printf(m, "pool=%d\n", ppp_data.pool_num);
......@@ -473,7 +473,8 @@ static int pseries_lparcfg_data(struct seq_file *m, void *v)
seq_printf(m, "partition_potential_processors=%d\n",
partition_potential_processors);
seq_printf(m, "shared_processor_mode=%d\n", lppaca_of(0).shared_proc);
seq_printf(m, "shared_processor_mode=%d\n",
lppaca_shared_proc(get_lppaca()));
seq_printf(m, "slb_size=%d\n", mmu_slb_size);
......
......@@ -217,7 +217,7 @@ struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
{
vpa->shared_proc = 1;
vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
vpa->yield_count = 1;
}
......
......@@ -1609,7 +1609,7 @@ int start_topology_update(void)
#endif
}
} else if (firmware_has_feature(FW_FEATURE_VPHN) &&
get_lppaca()->shared_proc) {
lppaca_shared_proc(get_lppaca())) {
if (!vphn_enabled) {
prrn_enabled = 0;
vphn_enabled = 1;
......
......@@ -123,7 +123,7 @@ static void pseries_mach_cpu_die(void)
cede_latency_hint = 2;
get_lppaca()->idle = 1;
if (!get_lppaca()->shared_proc)
if (!lppaca_shared_proc(get_lppaca()))
get_lppaca()->donate_dedicated_cpu = 1;
while (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) {
......@@ -137,7 +137,7 @@ static void pseries_mach_cpu_die(void)
local_irq_disable();
if (!get_lppaca()->shared_proc)
if (!lppaca_shared_proc(get_lppaca()))
get_lppaca()->donate_dedicated_cpu = 0;
get_lppaca()->idle = 0;
......
......@@ -308,7 +308,7 @@ static int pseries_idle_probe(void)
return -EPERM;
}
if (get_lppaca()->shared_proc)
if (lppaca_shared_proc(get_lppaca()))
cpuidle_state_table = shared_states;
else
cpuidle_state_table = dedicated_states;
......
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