[PATCH 5/9] platform/x86:intel/pmc: Add support to show ltr_ignore value

Xi Pardee
2024-06-24T20:32:26Z

From: Xi Pardee <xi.pardee@intel.com>

Add a column in ltr_show output to show if the IP has been ignored.
A mutex lock is used to protect the critical section as other processes
might try to write to the LTR ignore register at the same time.

Signed-off-by: Xi Pardee <xi.pardee@intel.com>
---
drivers/platform/x86/intel/pmc/core.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index cb7dd22e7406..3f271ca48164 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -623,13 +623,24 @@ static int pmc_core_ltr_show(struct seq_file *s, void *unused)
for (i = 0; i < ARRAY_SIZE(pmcdev->pmcs); ++i) {
struct pmc *pmc;
const struct pmc_bit_map *map;
+ u32 ltr_ign_reg;

pmc = pmcdev->pmcs[i];
if (!pmc)
continue;

+ scoped_guard(mutex, &pmcdev->lock)
+ ltr_ign_reg = pmc_core_reg_read(pmc, pmc->map->ltr_ignore_offset);
+
map = pmc->map->ltr_show_sts;
for (index = 0; map[index].name; index++) {
+ bool ltr_ign_data;
+
+ if (index > pmc->map->ltr_ignore_max)
+ ltr_ign_data = false;
+ else
+ ltr_ign_data = ltr_ign_reg & BIT(index);
+
decoded_snoop_ltr = decoded_non_snoop_ltr = 0;
ltr_raw_data = pmc_core_reg_read(pmc,
map[index].bit_mask);
@@ -647,10 +658,10 @@ static int pmc_core_ltr_show(struct seq_file *s, void *unused)
decoded_snoop_ltr = val * convert_ltr_scale(scale);
}

- seq_printf(s, "%d\tPMC%d:%-32s\tLTR: RAW: 0x%-16x\tNon-Snoop(ns): %-16llu\tSnoop(ns): %-16llu\n",
+ seq_printf(s, "%d\tPMC%d:%-32s\tLTR: RAW: 0x%-16x\tNon-Snoop(ns): %-16llu\tSnoop(ns): %-16llu\tLTR_IGNORE: %d\n",
ltr_index, i, map[index].name, ltr_raw_data,
decoded_non_snoop_ltr,
- decoded_snoop_ltr);
+ decoded_snoop_ltr, ltr_ign_data);
ltr_index++;
}
}
--
2.34.1