[PATCH 5/5] ACPI/CPPC: add sysfs support to compute delivered performance

[Prashanth Prakash <pprakash@codeaurora.org>]

From: Ashwin Chaugule <ashwin.chaugule@linaro.org>

The CPPC tables contain entries for per CPU feedback counters which
allows us to compute the delivered performance over a given interval
of time.

The math for delivered performance per the CPPCv5.0+ spec is:
  reference perf * delta(delivered perf ctr)/delta(ref perf ctr)

Maintaining deltas of the counters in the kernel is messy, as it
depends on when the reads are triggered. (e.g. via the cpufreq
->get() interface). Also the ->get() interace only returns one
value, so cant return raw values. So instead, leave it to userspace
to keep track of raw values and do its math for CPUs it cares about.

delivered and reference perf counters are exposed via the same
sysfs file to avoid the potential "skid", if these values are read
individually from userspace.

Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
---
 drivers/acpi/cppc_acpi.c | 94 +++++++++++++++++++++++++++++++++++++++++++-----
 include/acpi/cppc_acpi.h |  3 +-
 2 files changed, 86 insertions(+), 11 deletions(-)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 7844e4c..8bd501f 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -95,6 +95,17 @@ static unsigned int pcc_mpar, pcc_mrtt, pcc_nominal;
 				(cpc)->cpc_entry.reg.space_id ==	\
 				ACPI_ADR_SPACE_PLATFORM_COMM)
 
+/* Evalutes to True if reg is a NULL register descriptor */
+#define IS_NULL_REG(reg) ((reg)->space_id ==  ACPI_ADR_SPACE_SYSTEM_MEMORY && \
+				(reg)->address == 0 &&			\
+				(reg)->bit_width == 0 &&		\
+				(reg)->bit_offset == 0 &&		\
+				(reg)->access_width == 0)
+
+/* Evalutes to True if an optional cpc field is supported */
+#define CPC_SUPPORTED(cpc) ((cpc)->type == ACPI_TYPE_INTEGER ?		\
+				!!(cpc)->cpc_entry.int_value :			\
+				!IS_NULL_REG(&(cpc)->cpc_entry.reg))
 /*
  * Arbitrary Retries in case the remote processor is slow to respond
  * to PCC commands. Keeping it high enough to cover emulators where
@@ -102,6 +113,61 @@ static unsigned int pcc_mpar, pcc_mrtt, pcc_nominal;
  */
 #define NUM_RETRIES 500
 
+struct cppc_attr {
+	struct attribute attr;
+	ssize_t (*show)(struct kobject *kobj,
+			struct attribute *attr, char *buf);
+	ssize_t (*store)(struct kobject *kobj,
+			struct attribute *attr, const char *c, ssize_t count);
+};
+
+#define define_one_cppc_ro(_name)		\
+static struct cppc_attr _name =			\
+__ATTR(_name, 0444, show_##_name, NULL)
+
+#define to_cpc_desc(a) container_of(a, struct cpc_desc, kobj)
+
+static ssize_t show_feedback_ctrs(struct kobject *kobj,
+		struct attribute *attr, char *buf)
+{
+	struct cpc_desc *cpc_ptr = to_cpc_desc(kobj);
+	struct cppc_perf_fb_ctrs fb_ctrs = {0};
+
+	cppc_get_perf_ctrs(cpc_ptr->cpu_id, &fb_ctrs);
+
+	return scnprintf(buf, PAGE_SIZE, "ref:%lld del:%lld\n",
+			fb_ctrs.reference, fb_ctrs.delivered);
+}
+define_one_cppc_ro(feedback_ctrs);
+
+static ssize_t show_reference_perf(struct kobject *kobj,
+		struct attribute *attr, char *buf)
+{
+	struct cpc_desc *cpc_ptr = to_cpc_desc(kobj);
+	struct cppc_perf_caps perf_caps;
+
+	cppc_get_perf_caps(cpc_ptr->cpu_id, &perf_caps);
+
+	if (perf_caps.reference_perf)
+		return scnprintf(buf, PAGE_SIZE, "%u\n",
+				perf_caps.reference_perf);
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n",
+			perf_caps.nominal_perf);
+}
+define_one_cppc_ro(reference_perf);
+
+static struct attribute *cppc_attrs[] = {
+	&feedback_ctrs.attr,
+	&reference_perf.attr,
+	NULL
+};
+
+static struct kobj_type cppc_ktype = {
+	.sysfs_ops = &kobj_sysfs_ops,
+	.default_attrs = cppc_attrs,
+};
+
 static int check_pcc_chan(void)
 {
 	int ret = -EIO;
@@ -544,6 +610,7 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
 	union acpi_object *out_obj, *cpc_obj;
 	struct cpc_desc *cpc_ptr;
 	struct cpc_reg *gas_t;
+	struct device *cpu_dev;
 	acpi_handle handle = pr->handle;
 	unsigned int num_ent, i, cpc_rev;
 	acpi_status status;
@@ -666,6 +733,16 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
 	/* Everything looks okay */
 	pr_debug("Parsed CPC struct for CPU: %d\n", pr->id);
 
+	/* Add per logical CPU nodes for reading its feedback counters. */
+	cpu_dev = get_cpu_device(pr->id);
+	if (!cpu_dev)
+		goto out_free;
+
+	ret = kobject_init_and_add(&cpc_ptr->kobj, &cppc_ktype, &cpu_dev->kobj,
+			"acpi_cppc");
+	if (ret)
+		goto out_free;
+
 	kfree(output.pointer);
 	return 0;
 
@@ -695,6 +772,7 @@ void acpi_cppc_processor_exit(struct acpi_processor *pr)
 	struct cpc_desc *cpc_ptr;
 	unsigned int i;
 	void __iomem *addr;
+
 	cpc_ptr = per_cpu(cpc_desc_ptr, pr->id);
 
 	/* Free all the mapped sys mem areas for this CPU */
@@ -704,6 +782,7 @@ void acpi_cppc_processor_exit(struct acpi_processor *pr)
 			iounmap(addr);
 	}
 
+	kobject_put(&cpc_ptr->kobj);
 	kfree(cpc_ptr);
 }
 EXPORT_SYMBOL_GPL(acpi_cppc_processor_exit);
@@ -721,7 +800,7 @@ static int cpc_read(struct cpc_register_resource *reg_res, u64 *val)
 	struct cpc_reg *reg = &reg_res->cpc_entry.reg;
 
 	if (reg_res->type == ACPI_TYPE_INTEGER) {
-		*val = reg_res->int_value;
+		*val = reg_res->cpc_entry.int_value;
 		return ret_val;
 	}
 
@@ -836,8 +915,11 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps)
 	cpc_read(lowest_reg, &low);
 	perf_caps->lowest_perf = low;
 
-	cpc_read(ref_perf, &ref);
-	perf_caps->reference_perf = ref;
+	perf_caps->reference_perf = 0;
+	if (CPC_SUPPORTED(ref_perf)) {
+		cpc_read(ref_perf, &ref);
+		perf_caps->reference_perf = ref;
+	}
 
 	cpc_read(nom_perf, &nom);
 	perf_caps->nominal_perf = nom;
@@ -899,12 +981,6 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
 	perf_fb_ctrs->delivered = delivered;
 	perf_fb_ctrs->reference = reference;
 
-	perf_fb_ctrs->delivered -= perf_fb_ctrs->prev_delivered;
-	perf_fb_ctrs->reference -= perf_fb_ctrs->prev_reference;
-
-	perf_fb_ctrs->prev_delivered = delivered;
-	perf_fb_ctrs->prev_reference = reference;
-
 out_err:
 	if (regs_in_pcc)
 		up_write(&pcc_lock);
diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h
index 7b7e2e1..2bf9db1 100644
--- a/include/acpi/cppc_acpi.h
+++ b/include/acpi/cppc_acpi.h
@@ -63,6 +63,7 @@ struct cpc_desc {
 	int cpu_id;
 	struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT];
 	struct acpi_psd_package domain_info;
+	struct kobject kobj;
 };
 
 /* These are indexes into the per-cpu cpc_regs[]. Order is important. */
@@ -109,9 +110,7 @@ struct cppc_perf_ctrls {
 
 struct cppc_perf_fb_ctrs {
 	u64 reference;
-	u64 prev_reference;
 	u64 delivered;
-	u64 prev_delivered;
 };
 
 /* Per CPU container for runtime CPPC management. */
-- 
Qualcomm Technologies, Inc. on behalf
of the Qualcomm Innovation Center, Inc.  The Qualcomm Innovation Center, Inc. 
is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.