diff mbox series

perf/x86/intel/uncore: Fix oops when counting IMC uncore events on some TGL

Message ID 1590582647-90675-1-git-send-email-kan.liang@linux.intel.com
State Accepted
Commit 2af834f1faab3f1e218fcbcab70a399121620d62
Headers show
Series perf/x86/intel/uncore: Fix oops when counting IMC uncore events on some TGL | expand

Commit Message

Liang, Kan May 27, 2020, 12:30 p.m. UTC 
From: Kan Liang <kan.liang@linux.intel.com>

When counting IMC uncore events on some TGL machines, an oops will be
triggered.
  [ 393.101262] BUG: unable to handle page fault for address:
  ffffb45200e15858
  [ 393.101269] #PF: supervisor read access in kernel mode
  [ 393.101271] #PF: error_code(0x0000) - not-present page

Current perf uncore driver still use the IMC MAP SIZE inherited from
SNB, which is 0x6000.
However, the offset of IMC uncore counters for some TGL machines is
larger than 0x6000, e.g. 0xd8a0.

Enlarge the IMC MAP SIZE for TGL to 0xe000.

Fixes: fdb64822443e ("perf/x86: Add Intel Tiger Lake uncore support")
Reported-by: Ammy Yi <ammy.yi@intel.com>
Tested-by: Ammy Yi <ammy.yi@intel.com>
Tested-by: Chao Qin <chao.qin@intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: stable@vger.kernel.org
---
 arch/x86/events/intel/uncore_snb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c
index 3de1065..1038e9f 100644
--- a/arch/x86/events/intel/uncore_snb.c
+++ b/arch/x86/events/intel/uncore_snb.c
@@ -1085,6 +1085,7 @@  static struct pci_dev *tgl_uncore_get_mc_dev(void)
 }
 
 #define TGL_UNCORE_MMIO_IMC_MEM_OFFSET		0x10000
+#define TGL_UNCORE_PCI_IMC_MAP_SIZE		0xe000
 
 static void tgl_uncore_imc_freerunning_init_box(struct intel_uncore_box *box)
 {
@@ -1112,7 +1113,7 @@  static void tgl_uncore_imc_freerunning_init_box(struct intel_uncore_box *box)
 	addr |= ((resource_size_t)mch_bar << 32);
 #endif
 
-	box->io_addr = ioremap(addr, SNB_UNCORE_PCI_IMC_MAP_SIZE);
+	box->io_addr = ioremap(addr, TGL_UNCORE_PCI_IMC_MAP_SIZE);
 }
 
 static struct intel_uncore_ops tgl_uncore_imc_freerunning_ops = {