[PATCH v3 0/4] coresight: Do not call smp_processor_id from preemptible contexts

[PATCH v3 0/4] coresight: Do not call smp_processor_id from preemptible contexts

[Suzuki K Poulose]

We have a few places where we call smp_processor_id() from preemptible
contexts during the perf buffer handling. We do this to figure out the
numa node for the allocation in case the event is not CPU bound. Use
numa_node_id() instead in such cases to avoid a splat.

Changes since V2:
 - Use NUMA_NO_NODE instead of numa_node_id() for event->cpu == -1. (Robin Murphy)

Suzuki K Poulose (4):
  coresight: tmc-etr: Do not call smp_processor_id() from preemptible
  coresight: tmc-etr: alloc_perf_buf: Do not call smp_processor_id from
    preemptible
  coresight: tmc-etf: Do not call smp_processor_id from preemptible
  coresight: etb10: Do not call smp_processor_id from preemptible

 drivers/hwtracing/coresight/coresight-etb10.c   |  6 ++----
 drivers/hwtracing/coresight/coresight-tmc-etf.c |  6 ++----
 drivers/hwtracing/coresight/coresight-tmc-etr.c | 13 ++++---------
 3 files changed, 8 insertions(+), 17 deletions(-)

-- 
2.7.4


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[PATCH v3 1/4] coresight: tmc-etr: Do not call smp_processor_id() from preemptible

[Suzuki K Poulose]

Instead of using smp_processor_id() to figure out the node,
use the numa_node_id() for the current CPU node to avoid
splats like :

 BUG: using smp_processor_id() in preemptible [00000000] code: perf/1743
 caller is alloc_etr_buf.isra.6+0x80/0xa0
 CPU: 1 PID: 1743 Comm: perf Not tainted 5.1.0-rc6-147786-g116841e #344
 Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb  1 2019
  Call trace:
   dump_backtrace+0x0/0x150
   show_stack+0x14/0x20
   dump_stack+0x9c/0xc4
   debug_smp_processor_id+0x10c/0x110
   alloc_etr_buf.isra.6+0x80/0xa0
   tmc_alloc_etr_buffer+0x12c/0x1f0
   etm_setup_aux+0x1c4/0x230
   rb_alloc_aux+0x1b8/0x2b8
   perf_mmap+0x35c/0x478
   mmap_region+0x34c/0x4f0
   do_mmap+0x2d8/0x418
   vm_mmap_pgoff+0xd0/0xf8
   ksys_mmap_pgoff+0x88/0xf8
   __arm64_sys_mmap+0x28/0x38
   el0_svc_handler+0xd8/0x138
   el0_svc+0x8/0xc

Fixes: 855ab61c16bf70b646 ("coresight: tmc-etr: Refactor function tmc_etr_setup_perf_buf()")
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-tmc-etr.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index ce0114a..7c81f63 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1323,13 +1323,11 @@ static struct etr_perf_buffer *
 tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, struct perf_event *event,
 		       int nr_pages, void **pages, bool snapshot)
 {
-	int node, cpu = event->cpu;
+	int node;
 	struct etr_buf *etr_buf;
 	struct etr_perf_buffer *etr_perf;
 
-	if (cpu == -1)
-		cpu = smp_processor_id();
-	node = cpu_to_node(cpu);
+	node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu);
 
 	etr_perf = kzalloc_node(sizeof(*etr_perf), GFP_KERNEL, node);
 	if (!etr_perf)
-- 
2.7.4


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Re: [PATCH v3 1/4] coresight: tmc-etr: Do not call smp_processor_id() from preemptible

[Mathieu Poirier]

On Thu, May 30, 2019 at 05:54:24PM +0100, Suzuki K Poulose wrote:
> Instead of using smp_processor_id() to figure out the node,
> use the numa_node_id() for the current CPU node to avoid
> splats like :

I was in the process of applying this set when I noticed the changelogs are
still referring to numa_node_id(), which is not part of the solution anymore.
Please address in all 4 patches.

Mathieu

> 
>  BUG: using smp_processor_id() in preemptible [00000000] code: perf/1743
>  caller is alloc_etr_buf.isra.6+0x80/0xa0
>  CPU: 1 PID: 1743 Comm: perf Not tainted 5.1.0-rc6-147786-g116841e #344
>  Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb  1 2019
>   Call trace:
>    dump_backtrace+0x0/0x150
>    show_stack+0x14/0x20
>    dump_stack+0x9c/0xc4
>    debug_smp_processor_id+0x10c/0x110
>    alloc_etr_buf.isra.6+0x80/0xa0
>    tmc_alloc_etr_buffer+0x12c/0x1f0
>    etm_setup_aux+0x1c4/0x230
>    rb_alloc_aux+0x1b8/0x2b8
>    perf_mmap+0x35c/0x478
>    mmap_region+0x34c/0x4f0
>    do_mmap+0x2d8/0x418
>    vm_mmap_pgoff+0xd0/0xf8
>    ksys_mmap_pgoff+0x88/0xf8
>    __arm64_sys_mmap+0x28/0x38
>    el0_svc_handler+0xd8/0x138
>    el0_svc+0x8/0xc
> 
> Fixes: 855ab61c16bf70b646 ("coresight: tmc-etr: Refactor function tmc_etr_setup_perf_buf()")
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/hwtracing/coresight/coresight-tmc-etr.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> index ce0114a..7c81f63 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> @@ -1323,13 +1323,11 @@ static struct etr_perf_buffer *
>  tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, struct perf_event *event,
>  		       int nr_pages, void **pages, bool snapshot)
>  {
> -	int node, cpu = event->cpu;
> +	int node;
>  	struct etr_buf *etr_buf;
>  	struct etr_perf_buffer *etr_perf;
>  
> -	if (cpu == -1)
> -		cpu = smp_processor_id();
> -	node = cpu_to_node(cpu);
> +	node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu);
>  
>  	etr_perf = kzalloc_node(sizeof(*etr_perf), GFP_KERNEL, node);
>  	if (!etr_perf)
> -- 
> 2.7.4
> 

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Re: [PATCH v3 1/4] coresight: tmc-etr: Do not call smp_processor_id() from preemptible

[Suzuki K Poulose]

On 03/06/2019 20:29, Mathieu Poirier wrote:
> On Thu, May 30, 2019 at 05:54:24PM +0100, Suzuki K Poulose wrote:
>> Instead of using smp_processor_id() to figure out the node,
>> use the numa_node_id() for the current CPU node to avoid
>> splats like :
> 
> I was in the process of applying this set when I noticed the changelogs are
> still referring to numa_node_id(), which is not part of the solution anymore.
> Please address in all 4 patches.
> 

Sorry about the last minute messup. I will resend it.

Cheers
Suzuki

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[PATCH v3 2/4] coresight: tmc-etr: alloc_perf_buf: Do not call smp_processor_id from preemptible

[Suzuki K Poulose]

We find the current CPU using smp_processor_id() if the event is not bound
to a CPU, to find the node for memory allocation. Use the safe
numa_node_id() instead, to avoid BUG().

 BUG: using smp_processor_id() in preemptible [00000000] code: perf/1743
 caller is tmc_alloc_etr_buffer+0x1bc/0x1f0
 CPU: 1 PID: 1743 Comm: perf Not tainted 5.1.0-rc6-147786-g116841e #344
 Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb  1 2019
 Call trace:
  dump_backtrace+0x0/0x150
  show_stack+0x14/0x20
  dump_stack+0x9c/0xc4
  debug_smp_processor_id+0x10c/0x110
  tmc_alloc_etr_buffer+0x1bc/0x1f0
  etm_setup_aux+0x1c4/0x230
  rb_alloc_aux+0x1b8/0x2b8
  perf_mmap+0x35c/0x478
  mmap_region+0x34c/0x4f0
  do_mmap+0x2d8/0x418
  vm_mmap_pgoff+0xd0/0xf8
  ksys_mmap_pgoff+0x88/0xf8
  __arm64_sys_mmap+0x28/0x38
  el0_svc_handler+0xd8/0x138
  el0_svc+0x8/0xc

Fixes: 22f429f19c4135d51e9 ("coresight: etm-perf: Add support for ETR backend")
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-tmc-etr.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 7c81f63..5d2bf6d 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1184,14 +1184,11 @@ static struct etr_buf *
 alloc_etr_buf(struct tmc_drvdata *drvdata, struct perf_event *event,
 	      int nr_pages, void **pages, bool snapshot)
 {
-	int node, cpu = event->cpu;
+	int node;
 	struct etr_buf *etr_buf;
 	unsigned long size;
 
-	if (cpu == -1)
-		cpu = smp_processor_id();
-	node = cpu_to_node(cpu);
-
+	node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu);
 	/*
 	 * Try to match the perf ring buffer size if it is larger
 	 * than the size requested via sysfs.
-- 
2.7.4


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[PATCH v3 3/4] coresight: tmc-etf: Do not call smp_processor_id from preemptible

[Suzuki K Poulose]

We find the current CPU using smp_processor_id() if the event is not bound
to a CPU, to find the node for memory allocation. Use the safe
numa_node_id() instead, to avoid BUG(). e.g:

 BUG: using smp_processor_id() in preemptible [00000000] code: perf/2544
 caller is tmc_alloc_etf_buffer+0x5c/0x60
 CPU: 2 PID: 2544 Comm: perf Not tainted 5.1.0-rc6-147786-g116841e #344
 Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb  1 2019
 Call trace:
  dump_backtrace+0x0/0x150
  show_stack+0x14/0x20
  dump_stack+0x9c/0xc4
  debug_smp_processor_id+0x10c/0x110
  tmc_alloc_etf_buffer+0x5c/0x60
  etm_setup_aux+0x1c4/0x230
  rb_alloc_aux+0x1b8/0x2b8
  perf_mmap+0x35c/0x478
  mmap_region+0x34c/0x4f0
  do_mmap+0x2d8/0x418
  vm_mmap_pgoff+0xd0/0xf8
  ksys_mmap_pgoff+0x88/0xf8
  __arm64_sys_mmap+0x28/0x38
  el0_svc_handler+0xd8/0x138
  el0_svc+0x8/0xc

Fixes: 2e499bbc1a929ac ("coresight: tmc: implementing TMC-ETF AUX space API")
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-tmc-etf.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index b89e29c..23b7ff0 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -377,12 +377,10 @@ static void *tmc_alloc_etf_buffer(struct coresight_device *csdev,
 				  struct perf_event *event, void **pages,
 				  int nr_pages, bool overwrite)
 {
-	int node, cpu = event->cpu;
+	int node;
 	struct cs_buffers *buf;
 
-	if (cpu == -1)
-		cpu = smp_processor_id();
-	node = cpu_to_node(cpu);
+	node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu);
 
 	/* Allocate memory structure for interaction with Perf */
 	buf = kzalloc_node(sizeof(struct cs_buffers), GFP_KERNEL, node);
-- 
2.7.4


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[PATCH v3 4/4] coresight: etb10: Do not call smp_processor_id from preemptible

[Suzuki K Poulose]

We find the current CPU using smp_processor_id() if the event is not bound
to a CPU, to find the node for memory allocation. Use the safe
numa_node_id() instead, to avoid BUG(). e.g:

 BUG: using smp_processor_id() in preemptible [00000000] code: perf/2544

Fixes: 2997aa4063d97fdb39 ("coresight: etb10: implementing AUX API")
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etb10.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index d5b9ede..3810290 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -374,12 +374,10 @@ static void *etb_alloc_buffer(struct coresight_device *csdev,
 			      struct perf_event *event, void **pages,
 			      int nr_pages, bool overwrite)
 {
-	int node, cpu = event->cpu;
+	int node;
 	struct cs_buffers *buf;
 
-	if (cpu == -1)
-		cpu = smp_processor_id();
-	node = cpu_to_node(cpu);
+	node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu);
 
 	buf = kzalloc_node(sizeof(struct cs_buffers), GFP_KERNEL, node);
 	if (!buf)
-- 
2.7.4


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