[PATCH 9/9] platform/x86:intel/pmc: Add support to undo ltr_ignore

Xi Pardee
2024-06-24T20:32:29Z

Add ltr_restore support to undo the ltr_ignore action. It sets the
ltr_ignore bit of the corresponding IP to 0. Ltr_restore reuses some
functionality of pmc_core_ltr_ignore_write() so moved the common
functionality into a helper function.

Signed-off-by: Xi Pardee <xi.pardee@linux.intel.com>
---
drivers/platform/x86/intel/pmc/core.c | 38 ++++++++++++++++++++++-----
1 file changed, 32 insertions(+), 6 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index cfdacb04ff8d..9dbd3a43ddad 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -507,12 +507,10 @@ int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value, int ignore)
return 0;
}

-static ssize_t pmc_core_ltr_ignore_write(struct file *file,
- const char __user *userbuf,
- size_t count, loff_t *ppos)
+static ssize_t pmc_core_ltr_write(struct pmc_dev *pmcdev,
+ const char __user *userbuf,
+ size_t count, int ignore)
{
- struct seq_file *s = file->private_data;
- struct pmc_dev *pmcdev = s->private;
u32 value;
int err;

@@ -520,17 +518,43 @@ static ssize_t pmc_core_ltr_ignore_write(struct file *file,
if (err)
return err;

- err = pmc_core_send_ltr_ignore(pmcdev, value, 1);
+ err = pmc_core_send_ltr_ignore(pmcdev, value, ignore);

return err ?: count;
}

+static ssize_t pmc_core_ltr_ignore_write(struct file *file,
+ const char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct pmc_dev *pmcdev = s->private;
+
+ return pmc_core_ltr_write(pmcdev, userbuf, count, 1);
+}
+
static int pmc_core_ltr_ignore_show(struct seq_file *s, void *unused)
{
return 0;
}
DEFINE_SHOW_STORE_ATTRIBUTE(pmc_core_ltr_ignore);

+static ssize_t pmc_core_ltr_restore_write(struct file *file,
+ const char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct pmc_dev *pmcdev = s->private;
+
+ return pmc_core_ltr_write(pmcdev, userbuf, count, 0);
+}
+
+static int pmc_core_ltr_restore_show(struct seq_file *s, void *unused)
+{
+ return 0;
+}
+DEFINE_SHOW_STORE_ATTRIBUTE(pmc_core_ltr_restore);
+
static void pmc_core_slps0_dbg_latch(struct pmc_dev *pmcdev, bool reset)
{
struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
@@ -1208,6 +1232,8 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
debugfs_create_file("ltr_ignore", 0644, dir, pmcdev,
&pmc_core_ltr_ignore_fops);

+ debugfs_create_file("ltr_restore", 0200, dir, pmcdev, &pmc_core_ltr_restore_fops);
+
debugfs_create_file("ltr_show", 0444, dir, pmcdev, &pmc_core_ltr_fops);

if (primary_pmc->map->s0ix_blocker_maps)
--
2.34.1