drm/i915/pmu: Support multiple GPUs
With discrete graphics system can have both integrated and discrete GPU
handled by i915.
Currently we use a fixed name ("i915") when registering as the uncore PMU
provider which stops working in this case.
To fix this we add the PCI device name string to non-integrated devices
handled by us. Integrated devices keep the legacy name preserving
backward compatibility.
v2:
* Detect IGP and keep legacy name. (Michal)
* Use PCI device name as suffix. (Michal, Chris)
v3:
* Constify the name. (Chris)
* Use pci_domain_nr. (Chris)
v4:
* Fix kfree_const usage. (Chris)
v5:
* kfree_const does not work for modules. (Chris)
* Changed is_igp helper to take i915.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191016093802.12483-1-tvrtko.ursulin@linux.intel.com
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index d050871..00fe401 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -1080,6 +1080,17 @@ static void i915_pmu_unregister_cpuhp_state(struct i915_pmu *pmu)
cpuhp_remove_multi_state(cpuhp_slot);
}
+static bool is_igp(struct drm_i915_private *i915)
+{
+ struct pci_dev *pdev = i915->drm.pdev;
+
+ /* IGP is 0000:00:02.0 */
+ return pci_domain_nr(pdev->bus) == 0 &&
+ pdev->bus->number == 0 &&
+ PCI_SLOT(pdev->devfn) == 2 &&
+ PCI_FUNC(pdev->devfn) == 0;
+}
+
void i915_pmu_register(struct drm_i915_private *i915)
{
struct i915_pmu *pmu = &i915->pmu;
@@ -1110,10 +1121,19 @@ void i915_pmu_register(struct drm_i915_private *i915)
hrtimer_init(&pmu->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
pmu->timer.function = i915_sample;
- ret = perf_pmu_register(&pmu->base, "i915", -1);
- if (ret)
+ if (!is_igp(i915))
+ pmu->name = kasprintf(GFP_KERNEL,
+ "i915-%s",
+ dev_name(i915->drm.dev));
+ else
+ pmu->name = "i915";
+ if (!pmu->name)
goto err;
+ ret = perf_pmu_register(&pmu->base, pmu->name, -1);
+ if (ret)
+ goto err_name;
+
ret = i915_pmu_register_cpuhp_state(pmu);
if (ret)
goto err_unreg;
@@ -1122,6 +1142,9 @@ void i915_pmu_register(struct drm_i915_private *i915)
err_unreg:
perf_pmu_unregister(&pmu->base);
+err_name:
+ if (!is_igp(i915))
+ kfree(pmu->name);
err:
pmu->base.event_init = NULL;
free_event_attributes(pmu);
@@ -1143,5 +1166,7 @@ void i915_pmu_unregister(struct drm_i915_private *i915)
perf_pmu_unregister(&pmu->base);
pmu->base.event_init = NULL;
+ if (!is_igp(i915))
+ kfree(pmu->name);
free_event_attributes(pmu);
}