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powerpc/64: Defer paca allocation until memory topology is discovered 

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Rename the dummy allocate_pacas() to fix 32-bit build]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2018-02-14 01:08:19 +10:00 committed by Michael Ellerman
parent 9f593f131e
commit 59f577743d
4 changed files with 53 additions and 72 deletions
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6
arch/powerpc/include/asm/paca.h
View File

@ -255,12 +255,14 @@ extern void copy_mm_to_paca(struct mm_struct *mm);
extern struct paca_struct **paca_ptrs;
extern void initialise_paca(struct paca_struct *new_paca, int cpu);
extern void setup_paca(struct paca_struct *new_paca);
extern void allocate_pacas(void);
extern void allocate_paca_ptrs(void);
extern void allocate_paca(int cpu);
extern void free_unused_pacas(void);
#else /* CONFIG_PPC64 */
static inline void allocate_pacas(void) { };
static inline void allocate_paca_ptrs(void) { };
static inline void allocate_paca(int cpu) { };
static inline void free_unused_pacas(void) { };
#endif /* CONFIG_PPC64 */

90
arch/powerpc/kernel/paca.c
View File

@ -57,16 +57,6 @@ static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
return lp;
}
static void __init free_lppaca(struct lppaca *lp)
{
size_t size = 0x400;
if (early_cpu_has_feature(CPU_FTR_HVMODE))
return;
memblock_free(__pa(lp), size);
}
#endif /* CONFIG_PPC_BOOK3S */
#ifdef CONFIG_PPC_BOOK3S_64
@ -166,12 +156,24 @@ void setup_paca(struct paca_struct *new_paca)
static int __initdata paca_nr_cpu_ids;
static int __initdata paca_ptrs_size;
static int __initdata paca_struct_size;
void __init allocate_pacas(void)
void __init allocate_paca_ptrs(void)
{
paca_nr_cpu_ids = nr_cpu_ids;
paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
paca_ptrs = __va(memblock_alloc(paca_ptrs_size, 0));
memset(paca_ptrs, 0x88, paca_ptrs_size);
}
void __init allocate_paca(int cpu)
{
u64 limit;
unsigned long size = 0;
int cpu;
unsigned long pa;
struct paca_struct *paca;
BUG_ON(cpu >= paca_nr_cpu_ids);
#ifdef CONFIG_PPC_BOOK3S_64
/*
@ -183,69 +185,30 @@ void __init allocate_pacas(void)
limit = ppc64_rma_size;
#endif
paca_nr_cpu_ids = nr_cpu_ids;
pa = memblock_alloc_base(sizeof(struct paca_struct),
L1_CACHE_BYTES, limit);
paca = __va(pa);
paca_ptrs[cpu] = paca;
memset(paca, 0, sizeof(struct paca_struct));
paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
paca_ptrs = __va(memblock_alloc_base(paca_ptrs_size, 0, limit));
memset(paca_ptrs, 0, paca_ptrs_size);
size += paca_ptrs_size;
for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
unsigned long pa;
pa = memblock_alloc_base(sizeof(struct paca_struct),
L1_CACHE_BYTES, limit);
paca_ptrs[cpu] = __va(pa);
memset(paca_ptrs[cpu], 0, sizeof(struct paca_struct));
size += sizeof(struct paca_struct);
}
printk(KERN_DEBUG "Allocated %lu bytes for %u pacas\n",
size, nr_cpu_ids);
/* Can't use for_each_*_cpu, as they aren't functional yet */
for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
struct paca_struct *paca = paca_ptrs[cpu];
initialise_paca(paca, cpu);
initialise_paca(paca, cpu);
#ifdef CONFIG_PPC_PSERIES
paca->lppaca_ptr = new_lppaca(cpu, limit);
paca->lppaca_ptr = new_lppaca(cpu, limit);
#endif
#ifdef CONFIG_PPC_BOOK3S_64
paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
#endif
}
paca_struct_size += sizeof(struct paca_struct);
}
void __init free_unused_pacas(void)
{
unsigned long size = 0;
int new_ptrs_size;
int cpu;
for (cpu = 0; cpu < paca_nr_cpu_ids; cpu++) {
if (!cpu_possible(cpu)) {
unsigned long pa = __pa(paca_ptrs[cpu]);
#ifdef CONFIG_PPC_PSERIES
free_lppaca(paca_ptrs[cpu]->lppaca_ptr);
#endif
memblock_free(pa, sizeof(struct paca_struct));
paca_ptrs[cpu] = NULL;
size += sizeof(struct paca_struct);
}
}
new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
if (new_ptrs_size < paca_ptrs_size) {
if (new_ptrs_size < paca_ptrs_size)
memblock_free(__pa(paca_ptrs) + new_ptrs_size,
paca_ptrs_size - new_ptrs_size);
size += paca_ptrs_size - new_ptrs_size;
}
if (size)
printk(KERN_DEBUG "Freed %lu bytes for unused pacas\n", size);
paca_nr_cpu_ids = nr_cpu_ids;
paca_ptrs_size = new_ptrs_size;
@ -258,6 +221,9 @@ void __init free_unused_pacas(void)
paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL;
}
#endif
printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n",
paca_ptrs_size + paca_struct_size, nr_cpu_ids);
}
void copy_mm_to_paca(struct mm_struct *mm)

5
arch/powerpc/kernel/prom.c
View File

@ -365,7 +365,6 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
DBG("boot cpu: logical %d physical %d\n", found,
be32_to_cpu(intserv[found_thread]));
boot_cpuid = found;
set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
/*
* PAPR defines "logical" PVR values for cpus that
@ -403,7 +402,9 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
else if (!dt_cpu_ftrs_in_use())
cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
allocate_paca(boot_cpuid);
#endif
set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
return 0;
}
@ -744,7 +745,7 @@ void __init early_init_devtree(void *params)
* FIXME .. and the initrd too? */
move_device_tree();
allocate_pacas();
allocate_paca_ptrs();
DBG("Scanning CPUs ...\n");

24
arch/powerpc/kernel/setup-common.c
View File

@ -577,12 +577,6 @@ void __init smp_setup_cpu_maps(void)
setup_nr_cpu_ids();
free_unused_pacas();
for_each_possible_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
}
}
#endif /* CONFIG_SMP */
@ -848,6 +842,23 @@ static __init void print_system_info(void)
pr_info("-----------------------------------------------------\n");
}
#ifdef CONFIG_SMP
static void smp_setup_pacas(void)
{
int cpu;
for_each_possible_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
allocate_paca(cpu);
set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
}
memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
cpu_to_phys_id = NULL;
}
#endif
/*
* Called into from start_kernel this initializes memblock, which is used
* to manage page allocation until mem_init is called.
@ -915,6 +926,7 @@ void __init setup_arch(char **cmdline_p)
* so smp_release_cpus() does nothing for them.
*/
#ifdef CONFIG_SMP
smp_setup_pacas();
smp_release_cpus();
#endif