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Message-Id: <1456224595-3282-2-git-send-email-suzuki.poulose@arm.com>
Date: Tue, 23 Feb 2016 10:49:43 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: arm@...nel.org, arnd@...db.de, olof@...om.net,
punit.agrawal@....com, mark.rutland@....com, will.deacon@....com,
linux-kernel@...r.kernel.org,
Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH 01/13] arm-cci: simplify sysfs attr handling
From: Mark Rutland <mark.rutland@....com>
There's no need to dynamically initialise attribute pointers when we can
get the compiler to do it for us. We also don't need a dev_ext_attribute
for the cpumask, as the drvdata for a PMU device is a pointer to struct
pmu.
Cc: Punit Agrawal <punit.agrawal@....com>
Signed-off-by: Mark Rutland <mark.rutland@....com>
Tested-by: Suzuki K Poulose <suzuki.poulose@....com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
drivers/bus/arm-cci.c | 100 +++++++++++++------------------------------------
1 file changed, 25 insertions(+), 75 deletions(-)
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index 577cc4b..ee47e6b 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -121,10 +121,8 @@ struct cci_pmu_model {
u32 fixed_hw_cntrs;
u32 num_hw_cntrs;
u32 cntr_size;
- u64 nformat_attrs;
- u64 nevent_attrs;
- struct dev_ext_attribute *format_attrs;
- struct dev_ext_attribute *event_attrs;
+ struct attribute **format_attrs;
+ struct attribute **event_attrs;
struct event_range event_ranges[CCI_IF_MAX];
int (*validate_hw_event)(struct cci_pmu *, unsigned long);
int (*get_event_idx)(struct cci_pmu *, struct cci_pmu_hw_events *, unsigned long);
@@ -166,8 +164,10 @@ static ssize_t cci_pmu_format_show(struct device *dev,
static ssize_t cci_pmu_event_show(struct device *dev,
struct device_attribute *attr, char *buf);
-#define CCI_EXT_ATTR_ENTRY(_name, _func, _config) \
- { __ATTR(_name, S_IRUGO, _func, NULL), (void *)_config }
+#define CCI_EXT_ATTR_ENTRY(_name, _func, _config) \
+ &((struct dev_ext_attribute[]) { \
+ { __ATTR(_name, S_IRUGO, _func, NULL), (void *)_config } \
+ })[0].attr.attr
#define CCI_FORMAT_EXT_ATTR_ENTRY(_name, _config) \
CCI_EXT_ATTR_ENTRY(_name, cci_pmu_format_show, (char *)_config)
@@ -242,12 +242,13 @@ enum cci400_perf_events {
static ssize_t cci400_pmu_cycle_event_show(struct device *dev,
struct device_attribute *attr, char *buf);
-static struct dev_ext_attribute cci400_pmu_format_attrs[] = {
+static struct attribute *cci400_pmu_format_attrs[] = {
CCI_FORMAT_EXT_ATTR_ENTRY(event, "config:0-4"),
CCI_FORMAT_EXT_ATTR_ENTRY(source, "config:5-7"),
+ NULL
};
-static struct dev_ext_attribute cci400_r0_pmu_event_attrs[] = {
+static struct attribute *cci400_r0_pmu_event_attrs[] = {
/* Slave events */
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_any, 0x0),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_device, 0x01),
@@ -279,9 +280,10 @@ static struct dev_ext_attribute cci400_r0_pmu_event_attrs[] = {
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_stall_tt_full, 0x1A),
/* Special event for cycles counter */
CCI400_CYCLE_EVENT_EXT_ATTR_ENTRY(cycles, 0xff),
+ NULL
};
-static struct dev_ext_attribute cci400_r1_pmu_event_attrs[] = {
+static struct attribute *cci400_r1_pmu_event_attrs[] = {
/* Slave events */
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_any, 0x0),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_device, 0x01),
@@ -325,6 +327,7 @@ static struct dev_ext_attribute cci400_r1_pmu_event_attrs[] = {
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_unique_or_line_unique_addr_hazard, 0x11),
/* Special event for cycles counter */
CCI400_CYCLE_EVENT_EXT_ATTR_ENTRY(cycles, 0xff),
+ NULL
};
static ssize_t cci400_pmu_cycle_event_show(struct device *dev,
@@ -480,12 +483,13 @@ static inline struct cci_pmu_model *probe_cci_model(struct platform_device *pdev
static ssize_t cci500_pmu_global_event_show(struct device *dev,
struct device_attribute *attr, char *buf);
-static struct dev_ext_attribute cci500_pmu_format_attrs[] = {
+static struct attribute *cci500_pmu_format_attrs[] = {
CCI_FORMAT_EXT_ATTR_ENTRY(event, "config:0-4"),
CCI_FORMAT_EXT_ATTR_ENTRY(source, "config:5-8"),
+ NULL,
};
-static struct dev_ext_attribute cci500_pmu_event_attrs[] = {
+static struct attribute *cci500_pmu_event_attrs[] = {
/* Slave events */
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_arvalid, 0x0),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_dev, 0x1),
@@ -546,6 +550,7 @@ static struct dev_ext_attribute cci500_pmu_event_attrs[] = {
CCI500_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_rq_stall_addr_hazard, 0xD),
CCI500_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snopp_rq_stall_tt_full, 0xE),
CCI500_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_rq_tzmp1_prot, 0xF),
+ NULL
};
static ssize_t cci500_pmu_global_event_show(struct device *dev,
@@ -1176,9 +1181,8 @@ static int cci_pmu_event_init(struct perf_event *event)
static ssize_t pmu_cpumask_attr_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct dev_ext_attribute *eattr = container_of(attr,
- struct dev_ext_attribute, attr);
- struct cci_pmu *cci_pmu = eattr->var;
+ struct pmu *pmu = dev_get_drvdata(dev);
+ struct cci_pmu *cci_pmu = to_cci_pmu(pmu);
int n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
cpumask_pr_args(&cci_pmu->cpus));
@@ -1187,13 +1191,11 @@ static ssize_t pmu_cpumask_attr_show(struct device *dev,
return n;
}
-static struct dev_ext_attribute pmu_cpumask_attr = {
- __ATTR(cpumask, S_IRUGO, pmu_cpumask_attr_show, NULL),
- NULL, /* Populated in cci_pmu_init */
-};
+static struct device_attribute pmu_cpumask_attr =
+ __ATTR(cpumask, S_IRUGO, pmu_cpumask_attr_show, NULL);
static struct attribute *pmu_attrs[] = {
- &pmu_cpumask_attr.attr.attr,
+ &pmu_cpumask_attr.attr,
NULL,
};
@@ -1218,60 +1220,14 @@ static const struct attribute_group *pmu_attr_groups[] = {
NULL
};
-static struct attribute **alloc_attrs(struct platform_device *pdev,
- int n, struct dev_ext_attribute *source)
-{
- int i;
- struct attribute **attrs;
-
- /* Alloc n + 1 (for terminating NULL) */
- attrs = devm_kcalloc(&pdev->dev, n + 1, sizeof(struct attribute *),
- GFP_KERNEL);
- if (!attrs)
- return attrs;
- for(i = 0; i < n; i++)
- attrs[i] = &source[i].attr.attr;
- return attrs;
-}
-
-static int cci_pmu_init_attrs(struct cci_pmu *cci_pmu, struct platform_device *pdev)
-{
- const struct cci_pmu_model *model = cci_pmu->model;
- struct attribute **attrs;
-
- /*
- * All allocations below are managed, hence doesn't need to be
- * free'd explicitly in case of an error.
- */
-
- if (model->nevent_attrs) {
- attrs = alloc_attrs(pdev, model->nevent_attrs,
- model->event_attrs);
- if (!attrs)
- return -ENOMEM;
- pmu_event_attr_group.attrs = attrs;
- }
- if (model->nformat_attrs) {
- attrs = alloc_attrs(pdev, model->nformat_attrs,
- model->format_attrs);
- if (!attrs)
- return -ENOMEM;
- pmu_format_attr_group.attrs = attrs;
- }
- pmu_cpumask_attr.var = cci_pmu;
-
- return 0;
-}
-
static int cci_pmu_init(struct cci_pmu *cci_pmu, struct platform_device *pdev)
{
- char *name = cci_pmu->model->name;
+ const struct cci_pmu_model *model = cci_pmu->model;
+ char *name = model->name;
u32 num_cntrs;
- int rc;
- rc = cci_pmu_init_attrs(cci_pmu, pdev);
- if (rc)
- return rc;
+ pmu_event_attr_group.attrs = model->event_attrs;
+ pmu_format_attr_group.attrs = model->format_attrs;
cci_pmu->pmu = (struct pmu) {
.name = cci_pmu->model->name,
@@ -1336,9 +1292,7 @@ static struct cci_pmu_model cci_pmu_models[] = {
.num_hw_cntrs = 4,
.cntr_size = SZ_4K,
.format_attrs = cci400_pmu_format_attrs,
- .nformat_attrs = ARRAY_SIZE(cci400_pmu_format_attrs),
.event_attrs = cci400_r0_pmu_event_attrs,
- .nevent_attrs = ARRAY_SIZE(cci400_r0_pmu_event_attrs),
.event_ranges = {
[CCI_IF_SLAVE] = {
CCI400_R0_SLAVE_PORT_MIN_EV,
@@ -1358,9 +1312,7 @@ static struct cci_pmu_model cci_pmu_models[] = {
.num_hw_cntrs = 4,
.cntr_size = SZ_4K,
.format_attrs = cci400_pmu_format_attrs,
- .nformat_attrs = ARRAY_SIZE(cci400_pmu_format_attrs),
.event_attrs = cci400_r1_pmu_event_attrs,
- .nevent_attrs = ARRAY_SIZE(cci400_r1_pmu_event_attrs),
.event_ranges = {
[CCI_IF_SLAVE] = {
CCI400_R1_SLAVE_PORT_MIN_EV,
@@ -1382,9 +1334,7 @@ static struct cci_pmu_model cci_pmu_models[] = {
.num_hw_cntrs = 8,
.cntr_size = SZ_64K,
.format_attrs = cci500_pmu_format_attrs,
- .nformat_attrs = ARRAY_SIZE(cci500_pmu_format_attrs),
.event_attrs = cci500_pmu_event_attrs,
- .nevent_attrs = ARRAY_SIZE(cci500_pmu_event_attrs),
.event_ranges = {
[CCI_IF_SLAVE] = {
CCI500_SLAVE_PORT_MIN_EV,
--
1.7.9.5
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