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authorGu Zheng <guz.fnst@cn.fujitsu.com>2016-08-25 16:35:17 +0800
committerThomas Gleixner <tglx@linutronix.de>2016-09-21 21:18:39 +0200
commit8ad893faf2eaedb710a3073afbb5d569df2c3e41 (patch)
treeac488564d4d25f82fbcb5e6a8f331a3eb2401b34 /drivers/acpi/acpi_processor.c
parent8f54969dc8d6704632b42cbb5e47730cd75cc713 (diff)
downloadlinux-8ad893faf2eaedb710a3073afbb5d569df2c3e41.tar.bz2
x86/acpi: Enable MADT APIs to return disabled apicids
The whole patch-set aims at making cpuid <-> nodeid mapping persistent. So that, when node online/offline happens, cache based on cpuid <-> nodeid mapping such as wq_numa_possible_cpumask will not cause any problem. It contains 4 steps: 1. Enable apic registeration flow to handle both enabled and disabled cpus. 2. Introduce a new array storing all possible cpuid <-> apicid mapping. 3. Enable _MAT and MADT relative apis to return non-present or disabled cpus' apicid. 4. Establish all possible cpuid <-> nodeid mapping. This patch finishes step 3. There are four mappings in the kernel: 1. nodeid (logical node id) <-> pxm (persistent) 2. apicid (physical cpu id) <-> nodeid (persistent) 3. cpuid (logical cpu id) <-> apicid (not persistent, now persistent by step 2) 4. cpuid (logical cpu id) <-> nodeid (not persistent) So, in order to setup persistent cpuid <-> nodeid mapping for all possible CPUs, we should: 1. Setup cpuid <-> apicid mapping for all possible CPUs, which has been done in step 1, 2. 2. Setup cpuid <-> nodeid mapping for all possible CPUs. But before that, we should obtain all apicids from MADT. All processors' apicids can be obtained by _MAT method or from MADT in ACPI. The current code ignores disabled processors and returns -ENODEV. After this patch, a new parameter will be added to MADT APIs so that caller is able to control if disabled processors are ignored. Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Signed-off-by: Zhu Guihua <zhugh.fnst@cn.fujitsu.com> Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com> Acked-by: Ingo Molnar <mingo@kernel.org> Cc: mika.j.penttila@gmail.com Cc: len.brown@intel.com Cc: rafael@kernel.org Cc: rjw@rjwysocki.net Cc: yasu.isimatu@gmail.com Cc: linux-mm@kvack.org Cc: linux-acpi@vger.kernel.org Cc: isimatu.yasuaki@jp.fujitsu.com Cc: gongzhaogang@inspur.com Cc: tj@kernel.org Cc: izumi.taku@jp.fujitsu.com Cc: cl@linux.com Cc: chen.tang@easystack.cn Cc: akpm@linux-foundation.org Cc: kamezawa.hiroyu@jp.fujitsu.com Cc: lenb@kernel.org Link: http://lkml.kernel.org/r/1472114120-3281-5-git-send-email-douly.fnst@cn.fujitsu.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/acpi/acpi_processor.c')
-rw-r--r--drivers/acpi/acpi_processor.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index c7ba948d253c..02b84aa69fa4 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -300,8 +300,11 @@ static int acpi_processor_get_info(struct acpi_device *device)
* Extra Processor objects may be enumerated on MP systems with
* less than the max # of CPUs. They should be ignored _iff
* they are physically not present.
+ *
+ * NOTE: Even if the processor has a cpuid, it may not be present
+ * because cpuid <-> apicid mapping is persistent now.
*/
- if (invalid_logical_cpuid(pr->id)) {
+ if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {
int ret = acpi_processor_hotadd_init(pr);
if (ret)
return ret;