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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: 885dcd709b ("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>
This commit is contained in:
Michael Ellerman 2017-10-16 00:13:41 +05:30
parent 62b49c4210
commit f3f1dfd600
1 changed files with 6 additions and 6 deletions
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12
arch/powerpc/perf/imc-pmu.c
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@ -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)