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drm/i915/pmu: Avoid using globals for CPU hotplug state

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Attempting to bind / unbind module from devices where we have both
integrated and discreete GPU handled by i915 can lead to leaks and
warnings from cpuhp:
Error: Removing state XXX which has instances left.

Let's move the state to i915_pmu.

Fixes: 05488673a4 ("drm/i915/pmu: Support multiple GPUs")
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200219161822.24592-1-michal.winiarski@intel.com
This commit is contained in:
Michał Winiarski 2020-02-19 17:18:21 +01:00 committed by Chris Wilson
parent 0bf857358f
commit f5a179d468
2 changed files with 14 additions and 11 deletions
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18
drivers/gpu/drm/i915/i915_pmu.c
View File

@ -1042,7 +1042,7 @@ static void free_event_attributes(struct i915_pmu *pmu)
static int i915_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
{
struct i915_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), node);
struct i915_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), cpuhp.node);
GEM_BUG_ON(!pmu->base.event_init);
@ -1055,7 +1055,7 @@ static int i915_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
static int i915_pmu_cpu_offline(unsigned int cpu, struct hlist_node *node)
{
struct i915_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), node);
struct i915_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), cpuhp.node);
unsigned int target;
GEM_BUG_ON(!pmu->base.event_init);
@ -1072,8 +1072,6 @@ static int i915_pmu_cpu_offline(unsigned int cpu, struct hlist_node *node)
return 0;
}
static enum cpuhp_state cpuhp_slot = CPUHP_INVALID;
static int i915_pmu_register_cpuhp_state(struct i915_pmu *pmu)
{
enum cpuhp_state slot;
@ -1087,21 +1085,22 @@ static int i915_pmu_register_cpuhp_state(struct i915_pmu *pmu)
return ret;
slot = ret;
ret = cpuhp_state_add_instance(slot, &pmu->node);
ret = cpuhp_state_add_instance(slot, &pmu->cpuhp.node);
if (ret) {
cpuhp_remove_multi_state(slot);
return ret;
}
cpuhp_slot = slot;
pmu->cpuhp.slot = slot;
return 0;
}
static void i915_pmu_unregister_cpuhp_state(struct i915_pmu *pmu)
{
WARN_ON(cpuhp_slot == CPUHP_INVALID);
WARN_ON(cpuhp_state_remove_instance(cpuhp_slot, &pmu->node));
cpuhp_remove_multi_state(cpuhp_slot);
WARN_ON(pmu->cpuhp.slot == CPUHP_INVALID);
WARN_ON(cpuhp_state_remove_instance(pmu->cpuhp.slot, &pmu->cpuhp.node));
cpuhp_remove_multi_state(pmu->cpuhp.slot);
pmu->cpuhp.slot = CPUHP_INVALID;
}
static bool is_igp(struct drm_i915_private *i915)
@ -1128,6 +1127,7 @@ void i915_pmu_register(struct drm_i915_private *i915)
spin_lock_init(&pmu->lock);
hrtimer_init(&pmu->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
pmu->timer.function = i915_sample;
pmu->cpuhp.slot = CPUHP_INVALID;
if (!is_igp(i915)) {
pmu->name = kasprintf(GFP_KERNEL,

7
drivers/gpu/drm/i915/i915_pmu.h
View File

@ -39,9 +39,12 @@ struct i915_pmu_sample {
struct i915_pmu {
/**
* @node: List node for CPU hotplug handling.
* @cpuhp: Struct used for CPU hotplug handling.
*/
struct hlist_node node;
struct {
struct hlist_node node;
enum cpuhp_state slot;
} cpuhp;
/**
* @base: PMU base.
*/