From 2af834f1faab3f1e218fcbcab70a399121620d62 Mon Sep 17 00:00:00 2001 From: Kan Liang Date: Thu, 28 May 2020 08:19:27 -0700 Subject: [PATCH] perf/x86/intel/uncore: Fix oops when counting IMC uncore events on some TGL 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 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 Signed-off-by: Kan Liang Signed-off-by: Peter Zijlstra (Intel) Tested-by: Ammy Yi Tested-by: Chao Qin Link: https://lkml.kernel.org/r/1590679169-61823-1-git-send-email-kan.liang@linux.intel.com --- arch/x86/events/intel/uncore_snb.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c index 5c4036710b7a0..d5ae3a8221932 100644 --- a/arch/x86/events/intel/uncore_snb.c +++ b/arch/x86/events/intel/uncore_snb.c @@ -1151,6 +1151,7 @@ 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) { @@ -1178,7 +1179,7 @@ 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 = { -- 2.30.2