From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [RFC PATCH 07/12] powerpc/64: move default SPR recording
Date: Tue, 13 Feb 2018 03:08:17 +1000 [thread overview]
Message-ID: <20180212170822.14612-8-npiggin@gmail.com> (raw)
In-Reply-To: <20180212170822.14612-1-npiggin@gmail.com>
Move this into the early setup code, and don't iterate over CPU masks.
We don't want to call into sysfs so early from setup, and a future patch
won't initialize CPU masks by the time this is called.
---
arch/powerpc/kernel/paca.c | 3 +++
arch/powerpc/kernel/setup.h | 9 +++------
arch/powerpc/kernel/setup_64.c | 8 ++++++++
arch/powerpc/kernel/sysfs.c | 18 +++++++-----------
4 files changed, 21 insertions(+), 17 deletions(-)
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index 2699f9009286..e560072f122b 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -133,6 +133,9 @@ void __init initialise_paca(struct paca_struct *new_paca, int cpu)
new_paca->kexec_state = KEXEC_STATE_NONE;
new_paca->__current = &init_task;
new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
+#ifdef CONFIG_PPC64
+ new_paca->dscr_default = spr_default_dscr;
+#endif
#ifdef CONFIG_PPC_BOOK3S_64
new_paca->slb_shadow_ptr = NULL;
#endif
diff --git a/arch/powerpc/kernel/setup.h b/arch/powerpc/kernel/setup.h
index 3fc11e30308f..d144df54ad40 100644
--- a/arch/powerpc/kernel/setup.h
+++ b/arch/powerpc/kernel/setup.h
@@ -45,14 +45,11 @@ void emergency_stack_init(void);
static inline void emergency_stack_init(void) { };
#endif
-#ifdef CONFIG_PPC64
-void record_spr_defaults(void);
-#else
-static inline void record_spr_defaults(void) { };
-#endif
-
#ifdef CONFIG_PPC64
u64 ppc64_bolted_size(void);
+
+/* Default SPR values from firmware/kexec */
+extern unsigned long spr_default_dscr;
#endif
/*
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 3ce12af4906f..dde34d35d1e7 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -254,6 +254,14 @@ static void cpu_ready_for_interrupts(void)
get_paca()->kernel_msr = MSR_KERNEL;
}
+unsigned long spr_default_dscr = 0;
+
+void __init record_spr_defaults(void)
+{
+ if (early_cpu_has_feature(CPU_FTR_DSCR))
+ spr_default_dscr = mfspr(SPRN_DSCR);
+}
+
/*
* Early initialization entry point. This is called by head.S
* with MMU translation disabled. We rely on the "feature" of
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 1f9d94dac3a6..ab4eb61fe659 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -588,21 +588,17 @@ static DEVICE_ATTR(dscr_default, 0600,
static void sysfs_create_dscr_default(void)
{
- int err = 0;
- if (cpu_has_feature(CPU_FTR_DSCR))
- err = device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default);
-}
-
-void __init record_spr_defaults(void)
-{
- int cpu;
-
if (cpu_has_feature(CPU_FTR_DSCR)) {
- dscr_default = mfspr(SPRN_DSCR);
- for (cpu = 0; cpu < nr_cpu_ids; cpu++)
+ int err = 0;
+ int cpu;
+
+ for_each_possible_cpu(cpu)
paca_ptrs[cpu]->dscr_default = dscr_default;
+
+ err = device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default);
}
}
+
#endif /* CONFIG_PPC64 */
#ifdef HAS_PPC_PMC_PA6T
--
2.16.1
next prev parent reply other threads:[~2018-02-12 17:08 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-12 17:08 [RFC PATCH 00/12] numa aware allocation for pacas, stacks, Nicholas Piggin
2018-02-12 17:08 ` [RFC PATCH 01/12] powerpc/64s: do not allocate lppaca if we are not virtualized Nicholas Piggin
2018-02-12 17:08 ` [RFC PATCH 02/12] powerpc/64: Use array of paca pointers and allocate pacas individually Nicholas Piggin
2018-02-12 17:08 ` [RFC PATCH 03/12] powerpc/64s: allocate lppacas individually Nicholas Piggin
2018-02-12 17:08 ` [RFC PATCH 04/12] powerpc/64s: allocate slb_shadow structures individually Nicholas Piggin
2018-02-12 17:08 ` [RFC PATCH 05/12] mm: make memblock_alloc_base_nid non-static Nicholas Piggin
2018-02-12 17:08 ` [RFC PATCH 06/12] powerpc/mm/numa: move numa topology discovery earlier Nicholas Piggin
2018-02-12 17:08 ` Nicholas Piggin [this message]
2018-02-12 17:08 ` [RFC PATCH 08/12] powerpc/setup: cpu_to_phys_id array Nicholas Piggin
2018-02-12 17:08 ` [RFC PATCH 09/12] powerpc/64: defer paca allocation until memory topology is discovered Nicholas Piggin
2018-02-12 17:08 ` [RFC PATCH 10/12] powerpc/64: allocate pacas per node Nicholas Piggin
2018-02-12 17:08 ` [RFC PATCH 11/12] powerpc/64: allocate per-cpu stacks node-local if possible Nicholas Piggin
2018-02-12 17:08 ` [RFC PATCH 12/12] powerpc/64s/radix: allocate kernel page tables " Nicholas Piggin
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