[PATCH 09/14] powerpc/64: defer paca allocation until memory topology is discovered
Nicholas Piggin
npiggin at gmail.com
Wed Feb 14 02:08:19 AEDT 2018
---
arch/powerpc/include/asm/paca.h | 3 +-
arch/powerpc/kernel/paca.c | 90 ++++++++++++--------------------------
arch/powerpc/kernel/prom.c | 5 ++-
arch/powerpc/kernel/setup-common.c | 24 +++++++---
4 files changed, 51 insertions(+), 71 deletions(-)
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index f266b0a7be95..407a8076edd7 100644
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -252,7 +252,8 @@ 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 */
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index e560072f122b..12d329467631 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -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
@@ -169,12 +159,24 @@ 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_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_pacas(void)
+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
/*
@@ -186,69 +188,30 @@ void __init allocate_pacas(void)
limit = ppc64_rma_size;
#endif
- paca_nr_cpu_ids = nr_cpu_ids;
-
- 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];
+ 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));
- 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;
@@ -261,6 +224,9 @@ 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)
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 5979e34ba90e..a8b6ddbb540f 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -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");
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index bd79a5644c78..af7a47c8fe10 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -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
--
2.16.1
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