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bus: arm-ccn: Allocate event when it is being added, not initialised 

To make events rotation possible, they should be allocated when event
is being ->added(), not during initialisation. This patch moves the
respective code.

Signed-off-by: Pawel Moll <pawel.moll@arm.com>
This commit is contained in:
Pawel Moll 2015-04-17 12:37:36 +01:00
parent 9ce1aa869e
commit 57006d3e6f
1 changed files with 67 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

114
drivers/bus/arm-ccn.c
View File

@ -628,7 +628,65 @@ static int arm_ccn_pmu_type_eq(u32 a, u32 b)
return 0;
}
static void arm_ccn_pmu_event_destroy(struct perf_event *event)
static int arm_ccn_pmu_event_alloc(struct perf_event *event)
{
struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
struct hw_perf_event *hw = &event->hw;
u32 node_xp, type, event_id;
struct arm_ccn_component *source;
int bit;
node_xp = CCN_CONFIG_NODE(event->attr.config);
type = CCN_CONFIG_TYPE(event->attr.config);
event_id = CCN_CONFIG_EVENT(event->attr.config);
/* Allocate the cycle counter */
if (type == CCN_TYPE_CYCLES) {
if (test_and_set_bit(CCN_IDX_PMU_CYCLE_COUNTER,
ccn->dt.pmu_counters_mask))
return -EAGAIN;
hw->idx = CCN_IDX_PMU_CYCLE_COUNTER;
ccn->dt.pmu_counters[CCN_IDX_PMU_CYCLE_COUNTER].event = event;
return 0;
}
/* Allocate an event counter */
hw->idx = arm_ccn_pmu_alloc_bit(ccn->dt.pmu_counters_mask,
CCN_NUM_PMU_EVENT_COUNTERS);
if (hw->idx < 0) {
dev_dbg(ccn->dev, "No more counters available!\n");
return -EAGAIN;
}
if (type == CCN_TYPE_XP)
source = &ccn->xp[node_xp];
else
source = &ccn->node[node_xp];
ccn->dt.pmu_counters[hw->idx].source = source;
/* Allocate an event source or a watchpoint */
if (type == CCN_TYPE_XP && event_id == CCN_EVENT_WATCHPOINT)
bit = arm_ccn_pmu_alloc_bit(source->xp.dt_cmp_mask,
CCN_NUM_XP_WATCHPOINTS);
else
bit = arm_ccn_pmu_alloc_bit(source->pmu_events_mask,
CCN_NUM_PMU_EVENTS);
if (bit < 0) {
dev_dbg(ccn->dev, "No more event sources/watchpoints on node/XP %d!\n",
node_xp);
clear_bit(hw->idx, ccn->dt.pmu_counters_mask);
return -EAGAIN;
}
hw->config_base = bit;
ccn->dt.pmu_counters[hw->idx].event = event;
return 0;
}
static void arm_ccn_pmu_event_release(struct perf_event *event)
{
struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
struct hw_perf_event *hw = &event->hw;
@ -657,8 +715,7 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
struct arm_ccn *ccn;
struct hw_perf_event *hw = &event->hw;
u32 node_xp, type, event_id;
int valid, bit;
struct arm_ccn_component *source;
int valid;
int i;
struct perf_event *sibling;
@ -666,7 +723,6 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
return -ENOENT;
ccn = pmu_to_arm_ccn(event->pmu);
event->destroy = arm_ccn_pmu_event_destroy;
if (hw->sample_period) {
dev_warn(ccn->dev, "Sampling not supported!\n");
@ -778,49 +834,6 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
!is_software_event(sibling))
return -EINVAL;
/* Allocate the cycle counter */
if (type == CCN_TYPE_CYCLES) {
if (test_and_set_bit(CCN_IDX_PMU_CYCLE_COUNTER,
ccn->dt.pmu_counters_mask))
return -EAGAIN;
hw->idx = CCN_IDX_PMU_CYCLE_COUNTER;
ccn->dt.pmu_counters[CCN_IDX_PMU_CYCLE_COUNTER].event = event;
return 0;
}
/* Allocate an event counter */
hw->idx = arm_ccn_pmu_alloc_bit(ccn->dt.pmu_counters_mask,
CCN_NUM_PMU_EVENT_COUNTERS);
if (hw->idx < 0) {
dev_warn(ccn->dev, "No more counters available!\n");
return -EAGAIN;
}
if (type == CCN_TYPE_XP)
source = &ccn->xp[node_xp];
else
source = &ccn->node[node_xp];
ccn->dt.pmu_counters[hw->idx].source = source;
/* Allocate an event source or a watchpoint */
if (type == CCN_TYPE_XP && event_id == CCN_EVENT_WATCHPOINT)
bit = arm_ccn_pmu_alloc_bit(source->xp.dt_cmp_mask,
CCN_NUM_XP_WATCHPOINTS);
else
bit = arm_ccn_pmu_alloc_bit(source->pmu_events_mask,
CCN_NUM_PMU_EVENTS);
if (bit < 0) {
dev_warn(ccn->dev, "No more event sources/watchpoints on node/XP %d!\n",
node_xp);
clear_bit(hw->idx, ccn->dt.pmu_counters_mask);
return -EAGAIN;
}
hw->config_base = bit;
ccn->dt.pmu_counters[hw->idx].event = event;
return 0;
}
@ -1087,8 +1100,13 @@ static void arm_ccn_pmu_event_config(struct perf_event *event)
static int arm_ccn_pmu_event_add(struct perf_event *event, int flags)
{
int err;
struct hw_perf_event *hw = &event->hw;
err = arm_ccn_pmu_event_alloc(event);
if (err)
return err;
arm_ccn_pmu_event_config(event);
hw->state = PERF_HES_STOPPED;
@ -1102,6 +1120,8 @@ static int arm_ccn_pmu_event_add(struct perf_event *event, int flags)
static void arm_ccn_pmu_event_del(struct perf_event *event, int flags)
{
arm_ccn_pmu_event_stop(event, PERF_EF_UPDATE);
arm_ccn_pmu_event_release(event);
}
static void arm_ccn_pmu_event_read(struct perf_event *event)