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drm/i915/pmu: Support multiple GPUs

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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
This commit is contained in:
Tvrtko Ursulin 2019-10-16 10:38:02 +01:00
parent eb8de23c95
commit 05488673a4
2 changed files with 31 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/gpu/drm/i915/i915_pmu.c
View File

@ -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);
}

4
drivers/gpu/drm/i915/i915_pmu.h
View File

@ -46,6 +46,10 @@ struct i915_pmu {
* @base: PMU base.
*/
struct pmu base;
/**
* @name: Name as registered with perf core.
*/
const char *name;
/**
* @lock: Lock protecting enable mask and ref count handling.
*/