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From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: gregkh@linuxfoundation.org
Cc: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/5] coresight: tmc-etf: Do not call smp_processor_id from preemptible
Date: Thu, 20 Jun 2019 16:12:35 -0600
Message-ID: <20190620221237.3536-4-mathieu.poirier@linaro.org> (raw)
In-Reply-To: <20190620221237.3536-1-mathieu.poirier@linaro.org>

From: Suzuki K Poulose <suzuki.poulose@arm.com>

During a perf session we try to allocate buffers on the "node" associated
with the CPU the event is bound to. If it is not bound to a CPU, we
use the current CPU node, using smp_processor_id(). However this is unsafe
in a pre-emptible context and could generate the splats as below :

 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

Use NUMA_NO_NODE hint instead of using the current node for events
not bound to CPUs.

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>
Cc: stable <stable@vger.kernel.org> # 4.7+
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 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 2527b5d3b65e..8de109de171f 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -378,12 +378,10 @@ 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);
-- 
2.17.1


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  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-20 22:12 [PATCH 0/5] coresight: Fixes for v5.2-rc5 Mathieu Poirier
2019-06-20 22:12 ` [PATCH 1/5] coresight: tmc-etr: Do not call smp_processor_id() from preemptible Mathieu Poirier
2019-07-03 19:14   ` Greg KH
2019-06-20 22:12 ` [PATCH 2/5] coresight: tmc-etr: alloc_perf_buf: Do not call smp_processor_id " Mathieu Poirier
2019-06-20 22:12 ` Mathieu Poirier [this message]
2019-06-20 22:12 ` [PATCH 4/5] coresight: etb10: " Mathieu Poirier
2019-06-20 22:12 ` [PATCH 5/5] coresight: Potential uninitialized variable in probe() Mathieu Poirier
2019-07-02 16:18 ` [PATCH 0/5] coresight: Fixes for v5.2-rc5 Mathieu Poirier
2019-07-03 19:13   ` Greg KH

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