Add attributes only for registers that are supported by the platform.
This prevents unsupported, optional registers from having sysfs entries
created.
Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@xxxxxxx>
---
drivers/acpi/cppc_acpi.c | 82 +++++++++++++++++++++++++++++++++-------
1 file changed, 68 insertions(+), 14 deletions(-)
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index c43de65531ae..53a9dc9960b6 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -183,22 +183,8 @@ static ssize_t show_feedback_ctrs(struct kobject *kobj,
}
define_one_cppc_ro(feedback_ctrs);
-static struct attribute *cppc_attrs[] = {
- &feedback_ctrs.attr,
- &reference_perf.attr,
- &wraparound_time.attr,
- &highest_perf.attr,
- &lowest_perf.attr,
- &lowest_nonlinear_perf.attr,
- &nominal_perf.attr,
- &nominal_freq.attr,
- &lowest_freq.attr,
- NULL
-};
-
static struct kobj_type cppc_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
- .default_attrs = cppc_attrs,
};
static int check_pcc_chan(int pcc_ss_id, bool chk_err_bit)
@@ -733,6 +719,69 @@ static bool is_buf_only(int reg_idx)
CPC_SUP_BUFFER_ONLY(&cpc->cpc_regs[idx]) : \
CPC_SUPPORTED(&cpc->cpc_regs[idx]))
+static int is_mandatory_reg(int reg_idx)
+{
+ switch (reg_idx) {
+ case HIGHEST_PERF:
+ case NOMINAL_PERF:
+ case LOW_NON_LINEAR_PERF:
+ case LOWEST_PERF:
+ case REFERENCE_CTR:
+ case DELIVERED_CTR:
+ return 1;
+ }
+
+ return 0;
+}
+
+#define MANDATORY_REG_CNT 6
+
+static int set_cppc_attrs(struct cpc_desc *cpc, int entries)
+{
+ int i, attr_i = 0, opt_reg_cnt;
+ static struct attribute **cppc_attrs;
+
+ cppc_attrs = kcalloc(entries, sizeof(*cppc_attrs), GFP_KERNEL);
+ if (!cppc_attrs)
+ return -ENOMEM;
+
+ /* Set optional regs */
+ opt_reg_cnt = entries - MANDATORY_REG_CNT;
+ for (i = 0; i < MAX_CPC_REG_ENT && attr_i < opt_reg_cnt; i++) {
+ if (is_mandatory_reg(i) || !REG_SUPPORTED(cpc, i))
+ continue;
+
+ switch (i) {
+ case NOMINAL_FREQ:
+ cppc_attrs[attr_i++] = &nominal_freq.attr;
+ break;
+ case LOWEST_FREQ:
+ cppc_attrs[attr_i++] = &lowest_freq.attr;
+ break;
+ case REFERENCE_PERF:
+ cppc_attrs[attr_i++] = &reference_perf.attr;
+ break;
+ case CTR_WRAP_TIME:
+ cppc_attrs[attr_i++] = &wraparound_time.attr;
+ break;
+ }
+ }
+
+ /* Set mandatory regs */
+ cppc_attrs[attr_i++] = &highest_perf.attr;
+ cppc_attrs[attr_i++] = &nominal_perf.attr;
+ cppc_attrs[attr_i++] = &lowest_nonlinear_perf.attr;
+ cppc_attrs[attr_i++] = &lowest_perf.attr;
+
+ /* Set feedback_ctr sysfs entry */
+ cppc_attrs[attr_i] = &feedback_ctrs.attr;
+
+ /* Set kobj_type member */
+ cppc_ktype.default_attrs = cppc_attrs;
+
+ return 0;
+}
+
/**
* acpi_cppc_processor_probe - Search for per CPU _CPC objects.
* @pr: Ptr to acpi_processor containing this CPU's logical ID.
@@ -887,6 +936,10 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
/* Plug PSD data into this CPU's CPC descriptor. */
per_cpu(cpc_desc_ptr, pr->id) = cpc_ptr;
+ ret = set_cppc_attrs(cpc_ptr, num_ent - 2);
+ if (ret)
+ goto out_free;
+
ret = kobject_init_and_add(&cpc_ptr->kobj, &cppc_ktype, &cpu_dev->kobj,
"acpi_cppc");
if (ret) {
@@ -948,6 +1001,7 @@ void acpi_cppc_processor_exit(struct acpi_processor *pr)
iounmap(addr);
}
+ kfree(cppc_ktype.default_attrs);
kobject_put(&cpc_ptr->kobj);
kfree(cpc_ptr);
}
--
2.17.1
