From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
To: tglx@linutronix.de, peterz@infradead.org, tj@kernel.org,
oleg@redhat.com, paulmck@linux.vnet.ibm.com,
rusty@rustcorp.com.au, mingo@kernel.org,
akpm@linux-foundation.org, namhyung@kernel.org,
walken@google.com, vincent.guittot@linaro.org,
laijs@cn.fujitsu.com
Cc: linux-arch@vger.kernel.org, nikunj@linux.vnet.ibm.com,
zhong@linux.vnet.ibm.com, linux-pm@vger.kernel.org,
Chris Metcalf <cmetcalf@tilera.com>,
fweisbec@gmail.com, linux-kernel@vger.kernel.org,
rostedt@goodmis.org, xiaoguangrong@linux.vnet.ibm.com,
sbw@mit.edu, wangyun@linux.vnet.ibm.com,
srivatsa.bhat@linux.vnet.ibm.com, netdev@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 45/45] tile: Use get/put_online_cpus_atomic() to prevent CPU offline
Date: Sun, 23 Jun 2013 19:18:11 +0530 [thread overview]
Message-ID: <20130623134807.19094.82081.stgit@srivatsabhat.in.ibm.com> (raw)
In-Reply-To: <20130623133642.19094.16038.stgit@srivatsabhat.in.ibm.com>
Once stop_machine() is gone from the CPU offline path, we won't be able
to depend on disabling preemption to prevent CPUs from going offline
from under us.
Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going
offline, while invoking from atomic context.
Cc: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
---
arch/tile/kernel/module.c | 3 +++
arch/tile/kernel/tlb.c | 15 +++++++++++++++
arch/tile/mm/homecache.c | 3 +++
3 files changed, 21 insertions(+)
diff --git a/arch/tile/kernel/module.c b/arch/tile/kernel/module.c
index 4918d91..db7d858 100644
--- a/arch/tile/kernel/module.c
+++ b/arch/tile/kernel/module.c
@@ -20,6 +20,7 @@
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
+#include <linux/cpu.h>
#include <asm/pgtable.h>
#include <asm/homecache.h>
#include <arch/opcode.h>
@@ -79,8 +80,10 @@ void module_free(struct module *mod, void *module_region)
vfree(module_region);
/* Globally flush the L1 icache. */
+ get_online_cpus_atomic();
flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
0, 0, 0, NULL, NULL, 0);
+ put_online_cpus_atomic();
/*
* FIXME: If module_region == mod->module_init, trim exception
diff --git a/arch/tile/kernel/tlb.c b/arch/tile/kernel/tlb.c
index 3fd54d5..a32b9dd 100644
--- a/arch/tile/kernel/tlb.c
+++ b/arch/tile/kernel/tlb.c
@@ -14,6 +14,7 @@
*/
#include <linux/cpumask.h>
+#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/hugetlb.h>
#include <asm/tlbflush.h>
@@ -35,6 +36,8 @@ void flush_tlb_mm(struct mm_struct *mm)
{
HV_Remote_ASID asids[NR_CPUS];
int i = 0, cpu;
+
+ get_online_cpus_atomic();
for_each_cpu(cpu, mm_cpumask(mm)) {
HV_Remote_ASID *asid = &asids[i++];
asid->y = cpu / smp_topology.width;
@@ -43,6 +46,7 @@ void flush_tlb_mm(struct mm_struct *mm)
}
flush_remote(0, HV_FLUSH_EVICT_L1I, mm_cpumask(mm),
0, 0, 0, NULL, asids, i);
+ put_online_cpus_atomic();
}
void flush_tlb_current_task(void)
@@ -55,8 +59,11 @@ void flush_tlb_page_mm(struct vm_area_struct *vma, struct mm_struct *mm,
{
unsigned long size = vma_kernel_pagesize(vma);
int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
+
+ get_online_cpus_atomic();
flush_remote(0, cache, mm_cpumask(mm),
va, size, size, mm_cpumask(mm), NULL, 0);
+ put_online_cpus_atomic();
}
void flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
@@ -71,13 +78,18 @@ void flush_tlb_range(struct vm_area_struct *vma,
unsigned long size = vma_kernel_pagesize(vma);
struct mm_struct *mm = vma->vm_mm;
int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
+
+ get_online_cpus_atomic();
flush_remote(0, cache, mm_cpumask(mm), start, end - start, size,
mm_cpumask(mm), NULL, 0);
+ put_online_cpus_atomic();
}
void flush_tlb_all(void)
{
int i;
+
+ get_online_cpus_atomic();
for (i = 0; ; ++i) {
HV_VirtAddrRange r = hv_inquire_virtual(i);
if (r.size == 0)
@@ -89,10 +101,13 @@ void flush_tlb_all(void)
r.start, r.size, HPAGE_SIZE, cpu_online_mask,
NULL, 0);
}
+ put_online_cpus_atomic();
}
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
+ get_online_cpus_atomic();
flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
start, end - start, PAGE_SIZE, cpu_online_mask, NULL, 0);
+ put_online_cpus_atomic();
}
diff --git a/arch/tile/mm/homecache.c b/arch/tile/mm/homecache.c
index 1ae9119..7ff5bf0 100644
--- a/arch/tile/mm/homecache.c
+++ b/arch/tile/mm/homecache.c
@@ -397,9 +397,12 @@ void homecache_change_page_home(struct page *page, int order, int home)
BUG_ON(page_count(page) > 1);
BUG_ON(page_mapcount(page) != 0);
kva = (unsigned long) page_address(page);
+
+ get_online_cpus_atomic();
flush_remote(0, HV_FLUSH_EVICT_L2, &cpu_cacheable_map,
kva, pages * PAGE_SIZE, PAGE_SIZE, cpu_online_mask,
NULL, 0);
+ put_online_cpus_atomic();
for (i = 0; i < pages; ++i, kva += PAGE_SIZE) {
pte_t *ptep = virt_to_pte(NULL, kva);
prev parent reply other threads:[~2013-06-23 13:51 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-23 13:37 [PATCH 00/45] CPU hotplug: stop_machine()-free CPU hotplug, part 1 Srivatsa S. Bhat
2013-06-23 13:38 ` [PATCH 01/45] CPU hotplug: Provide APIs to prevent CPU offline from atomic context Srivatsa S. Bhat
2013-06-24 22:49 ` Steven Rostedt
2013-06-23 13:38 ` [PATCH 02/45] CPU hotplug: Clarify the usage of different synchronization APIs Srivatsa S. Bhat
2013-06-23 13:38 ` [PATCH 03/45] Documentation, CPU hotplug: Recommend usage of get/put_online_cpus_atomic() Srivatsa S. Bhat
2013-06-23 13:38 ` [PATCH 04/45] CPU hotplug: Add infrastructure to check lacking hotplug synchronization Srivatsa S. Bhat
2013-06-24 23:26 ` Steven Rostedt
2013-06-25 18:49 ` Srivatsa S. Bhat
2013-06-23 13:39 ` [PATCH 05/45] CPU hotplug: Protect set_cpu_online() to avoid false-positives Srivatsa S. Bhat
2013-06-23 13:39 ` [PATCH 06/45] CPU hotplug: Sprinkle debugging checks to catch locking bugs Srivatsa S. Bhat
2013-06-23 13:39 ` [PATCH 07/45] CPU hotplug: Expose the new debug config option Srivatsa S. Bhat
2013-06-23 15:08 ` Sergei Shtylyov
2013-06-23 18:58 ` Srivatsa S. Bhat
2013-06-23 13:39 ` [PATCH 08/45] CPU hotplug: Convert preprocessor macros to static inline functions Srivatsa S. Bhat
2013-06-23 13:40 ` [PATCH 09/45] smp: Use get/put_online_cpus_atomic() to prevent CPU offline Srivatsa S. Bhat
2013-06-23 13:40 ` [PATCH 10/45] sched/core: " Srivatsa S. Bhat
2013-06-23 13:40 ` [PATCH 11/45] migration: Use raw_spin_lock/unlock since interrupts are already disabled Srivatsa S. Bhat
2013-06-23 13:40 ` [PATCH 12/45] sched/fair: Use get/put_online_cpus_atomic() to prevent CPU offline Srivatsa S. Bhat
2013-06-23 13:40 ` [PATCH 13/45] timer: " Srivatsa S. Bhat
2013-06-23 13:41 ` [PATCH 14/45] sched/rt: " Srivatsa S. Bhat
2013-06-23 13:41 ` [PATCH 15/45] rcu: " Srivatsa S. Bhat
2013-06-23 13:41 ` [PATCH 16/45] tick-broadcast: " Srivatsa S. Bhat
2013-06-23 13:41 ` [PATCH 17/45] time/clocksource: " Srivatsa S. Bhat
2013-06-23 13:42 ` [PATCH 18/45] softirq: " Srivatsa S. Bhat
2013-06-23 13:42 ` [PATCH 19/45] irq: " Srivatsa S. Bhat
2013-06-23 13:42 ` [PATCH 20/45] net: " Srivatsa S. Bhat
2013-06-23 13:42 ` [PATCH 21/45] block: " Srivatsa S. Bhat
2013-06-23 13:42 ` [PATCH 22/45] percpu_counter: " Srivatsa S. Bhat
2013-06-24 17:55 ` Tejun Heo
2013-06-24 18:06 ` Tejun Heo
2013-06-24 18:09 ` Srivatsa S. Bhat
2013-06-23 13:43 ` [PATCH 23/45] infiniband: ehca: " Srivatsa S. Bhat
2013-06-23 13:43 ` [PATCH 24/45] [SCSI] fcoe: " Srivatsa S. Bhat
2013-06-23 13:43 ` [PATCH 25/45] staging/octeon: " Srivatsa S. Bhat
2013-06-23 18:17 ` Greg Kroah-Hartman
2013-06-23 18:55 ` Srivatsa S. Bhat
2013-06-23 19:17 ` Joe Perches
2013-06-24 17:25 ` Srivatsa S. Bhat
2013-06-24 18:17 ` David Daney
2013-06-23 13:43 ` [PATCH 26/45] x86: " Srivatsa S. Bhat
2013-06-23 13:43 ` [PATCH 27/45] perf/x86: " Srivatsa S. Bhat
2013-06-23 13:44 ` [PATCH 28/45] KVM: " Srivatsa S. Bhat
2013-06-23 13:44 ` [PATCH 29/45] kvm/vmx: " Srivatsa S. Bhat
2013-06-23 13:44 ` [PATCH 30/45] x86/xen: " Srivatsa S. Bhat
2013-06-23 13:45 ` [PATCH 31/45] alpha/smp: " Srivatsa S. Bhat
2013-06-23 17:50 ` Matt Turner
2013-06-23 18:56 ` Srivatsa S. Bhat
2013-06-23 13:45 ` [PATCH 32/45] blackfin/smp: " Srivatsa S. Bhat
2013-06-23 13:45 ` [PATCH 33/45] cris/smp: " Srivatsa S. Bhat
2013-06-24 6:41 ` Jesper Nilsson
2013-06-23 13:45 ` [PATCH 34/45] hexagon/smp: " Srivatsa S. Bhat
2013-06-23 13:45 ` [PATCH 35/45] ia64: irq, perfmon: " Srivatsa S. Bhat
2013-06-23 13:46 ` [PATCH 36/45] ia64: smp, tlb: " Srivatsa S. Bhat
2013-06-23 13:46 ` [PATCH 37/45] m32r: " Srivatsa S. Bhat
2013-06-23 13:46 ` [PATCH 38/45] MIPS: " Srivatsa S. Bhat
2013-06-23 13:46 ` [PATCH 39/45] mn10300: " Srivatsa S. Bhat
2013-06-23 13:47 ` [PATCH 40/45] powerpc, irq: Use GFP_ATOMIC allocations in atomic context Srivatsa S. Bhat
2013-06-25 2:08 ` Michael Ellerman
2013-06-25 2:13 ` Benjamin Herrenschmidt
2013-06-25 2:58 ` Michael Ellerman
2013-06-25 3:13 ` Benjamin Herrenschmidt
2013-06-25 19:20 ` Srivatsa S. Bhat
2013-06-23 13:47 ` [PATCH 41/45] powerpc: Use get/put_online_cpus_atomic() to prevent CPU offline Srivatsa S. Bhat
2013-06-23 13:47 ` [PATCH 42/45] powerpc: Use get/put_online_cpus_atomic() to avoid false-positive warning Srivatsa S. Bhat
2013-06-23 13:47 ` [PATCH 43/45] sh: Use get/put_online_cpus_atomic() to prevent CPU offline Srivatsa S. Bhat
2013-06-23 13:48 ` [PATCH 44/45] sparc: " Srivatsa S. Bhat
2013-06-23 13:48 ` Srivatsa S. Bhat [this message]
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