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authorMichael Ellerman <mpe@ellerman.id.au>2017-10-16 00:13:41 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2017-11-22 12:24:46 +1100
commitf3f1dfd600ff82b18b7ea73d80eb27f476a6aa97 (patch)
tree5ece696e86f5b89c26a3517aebb8ff5a8bf7106d /arch
parent62b49c42107efd973edffc75f4f874c5226cd20a (diff)
downloadlinux-f3f1dfd600ff82b18b7ea73d80eb27f476a6aa97.tar.bz2
powerpc/perf/imc: Use cpu_to_node() not topology_physical_package_id()
init_imc_pmu() uses topology_physical_package_id() to detect the node id of the processor it is on to get local memory, but that's wrong, and can lead to crashes. Fix it to use cpu_to_node(). Fixes: 885dcd709ba9 ("powerpc/perf: Add nest IMC PMU support") Cc: stable@vger.kernel.org # v4.14+ Reported-By: Rob Lippert <rlippert@google.com> Tested-By: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/perf/imc-pmu.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index 36344117c680..cf64e16f92c2 100644
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -467,7 +467,7 @@ static int nest_imc_event_init(struct perf_event *event)
* Nest HW counter memory resides in a per-chip reserve-memory (HOMER).
* Get the base memory addresss for this cpu.
*/
- chip_id = topology_physical_package_id(event->cpu);
+ chip_id = cpu_to_chip_id(event->cpu);
pcni = pmu->mem_info;
do {
if (pcni->id == chip_id) {
@@ -524,19 +524,19 @@ static int nest_imc_event_init(struct perf_event *event)
*/
static int core_imc_mem_init(int cpu, int size)
{
- int phys_id, rc = 0, core_id = (cpu / threads_per_core);
+ int nid, rc = 0, core_id = (cpu / threads_per_core);
struct imc_mem_info *mem_info;
/*
* alloc_pages_node() will allocate memory for core in the
* local node only.
*/
- phys_id = topology_physical_package_id(cpu);
+ nid = cpu_to_node(cpu);
mem_info = &core_imc_pmu->mem_info[core_id];
mem_info->id = core_id;
/* We need only vbase for core counters */
- mem_info->vbase = page_address(alloc_pages_node(phys_id,
+ mem_info->vbase = page_address(alloc_pages_node(nid,
GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE |
__GFP_NOWARN, get_order(size)));
if (!mem_info->vbase)
@@ -797,14 +797,14 @@ static int core_imc_event_init(struct perf_event *event)
static int thread_imc_mem_alloc(int cpu_id, int size)
{
u64 ldbar_value, *local_mem = per_cpu(thread_imc_mem, cpu_id);
- int phys_id = topology_physical_package_id(cpu_id);
+ int nid = cpu_to_node(cpu_id);
if (!local_mem) {
/*
* This case could happen only once at start, since we dont
* free the memory in cpu offline path.
*/
- local_mem = page_address(alloc_pages_node(phys_id,
+ local_mem = page_address(alloc_pages_node(nid,
GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE |
__GFP_NOWARN, get_order(size)));
if (!local_mem)