5.15-stable review patch. If anyone has any objections, please let me know.
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From: Kan Liang kan.liang@linux.intel.com
commit 5d515ee40cb57ea5331998f27df7946a69f14dc3 upstream.
The kernel warning message is triggered, when SPR MCC is used.
[ 17.945331] ------------[ cut here ]------------ [ 17.946305] WARNING: CPU: 65 PID: 1 at arch/x86/events/intel/uncore_discovery.c:184 intel_uncore_has_discovery_tables+0x4c0/0x65c [ 17.946305] Modules linked in: [ 17.946305] CPU: 65 PID: 1 Comm: swapper/0 Not tainted 5.4.17-2136.313.1-X10-2c+ #4
It's caused by the broken discovery table of UPI.
The discovery tables are from hardware. Except for dropping the broken information, there is nothing Linux can do. Using WARN_ON_ONCE() is overkilled.
Use the pr_info() to replace WARN_ON_ONCE(), and specify what uncore unit is dropped and the reason.
Signed-off-by: Kan Liang kan.liang@linux.intel.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Tested-by: Michael Petlan mpetlan@redhat.com Link: https://lore.kernel.org/r/20230112200105.733466-6-kan.liang@linux.intel.com Cc: Mahmoud Adam mngyadam@amazon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/events/intel/uncore_discovery.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-)
--- a/arch/x86/events/intel/uncore_discovery.c +++ b/arch/x86/events/intel/uncore_discovery.c @@ -140,13 +140,21 @@ uncore_insert_box_info(struct uncore_uni unsigned int *box_offset, *ids; int i;
- if (WARN_ON_ONCE(!unit->ctl || !unit->ctl_offset || !unit->ctr_offset)) + if (!unit->ctl || !unit->ctl_offset || !unit->ctr_offset) { + pr_info("Invalid address is detected for uncore type %d box %d, " + "Disable the uncore unit.\n", + unit->box_type, unit->box_id); return; + }
if (parsed) { type = search_uncore_discovery_type(unit->box_type); - if (WARN_ON_ONCE(!type)) + if (!type) { + pr_info("A spurious uncore type %d is detected, " + "Disable the uncore type.\n", + unit->box_type); return; + } /* Store the first box of each die */ if (!type->box_ctrl_die[die]) type->box_ctrl_die[die] = unit->ctl; @@ -181,8 +189,12 @@ uncore_insert_box_info(struct uncore_uni ids[i] = type->ids[i]; box_offset[i] = type->box_offset[i];
- if (WARN_ON_ONCE(unit->box_id == ids[i])) + if (unit->box_id == ids[i]) { + pr_info("Duplicate uncore type %d box ID %d is detected, " + "Drop the duplicate uncore unit.\n", + unit->box_type, unit->box_id); goto free_ids; + } } ids[i] = unit->box_id; box_offset[i] = unit->ctl - type->box_ctrl;