linux-kernel - Re: [PATCH 4/7] drm/i915/pmu: Drop is

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Message-ID: <4cd8c6c7-bd15-4663-bb0b-815904560c90@ursulin.net>
Date: Tue, 23 Jul 2024 08:52:57 +0100
From: Tvrtko Ursulin <tursulin@...ulin.net>
To: Lucas De Marchi <lucas.demarchi@...el.com>,
 intel-gfx@...ts.freedesktop.org, linux-perf-users@...r.kernel.org
Cc: Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
 dri-devel@...ts.freedesktop.org, Peter Zijlstra <peterz@...radead.org>,
 Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] drm/i915/pmu: Drop is_igp()


On 22/07/2024 22:06, Lucas De Marchi wrote:
> There's no reason to hardcode checking for integrated graphics on a
> specific pci slot. That information is already available per platform an
> can be checked with IS_DGFX().

Hmm probably reason was this, added is_igp:

commit 05488673a4d41383f9dd537f298e525e6b00fb93
Author:     Tvrtko Ursulin <tursulin@...ulin.net>
AuthorDate: Wed Oct 16 10:38:02 2019 +0100
Commit:     Tvrtko Ursulin <tursulin@...ulin.net>
CommitDate: Thu Oct 17 10:50:47 2019 +0100

     drm/i915/pmu: Support multiple GPUs

Added IS_DGFX:

commit dc90fe3fd219c7693617ba09a9467e4aadc2e039
Author:     José Roberto de Souza <jose.souza@...el.com>
AuthorDate: Thu Oct 24 12:51:19 2019 -0700
Commit:     Lucas De Marchi <lucas.demarchi@...el.com>
CommitDate: Fri Oct 25 13:53:51 2019 -0700

     drm/i915: Add is_dgfx to device info

So innocently arrived just a bit before.

Regards,

Tvrtko

> Signed-off-by: Lucas De Marchi <lucas.demarchi@...el.com>
> ---
>   drivers/gpu/drm/i915/i915_pmu.c | 17 +++--------------
>   1 file changed, 3 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
> index 3a8bd11b87e7..b5d14dd318e4 100644
> --- a/drivers/gpu/drm/i915/i915_pmu.c
> +++ b/drivers/gpu/drm/i915/i915_pmu.c
> @@ -1235,17 +1235,6 @@ static void i915_pmu_unregister_cpuhp_state(struct i915_pmu *pmu)
>   	cpuhp_state_remove_instance(cpuhp_slot, &pmu->cpuhp.node);
>   }
>   
> -static bool is_igp(struct drm_i915_private *i915)
> -{
> -	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
> -
> -	/* 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;
> @@ -1269,7 +1258,7 @@ void i915_pmu_register(struct drm_i915_private *i915)
>   	pmu->cpuhp.cpu = -1;
>   	init_rc6(pmu);
>   
> -	if (!is_igp(i915)) {
> +	if (IS_DGFX(i915)) {
>   		pmu->name = kasprintf(GFP_KERNEL,
>   				      "i915_%s",
>   				      dev_name(i915->drm.dev));
> @@ -1323,7 +1312,7 @@ void i915_pmu_register(struct drm_i915_private *i915)
>   	pmu->base.event_init = NULL;
>   	free_event_attributes(pmu);
>   err_name:
> -	if (!is_igp(i915))
> +	if (IS_DGFX(i915))
>   		kfree(pmu->name);
>   err:
>   	drm_notice(&i915->drm, "Failed to register PMU!\n");
> @@ -1351,7 +1340,7 @@ void i915_pmu_unregister(struct drm_i915_private *i915)
>   	perf_pmu_unregister(&pmu->base);
>   	pmu->base.event_init = NULL;
>   	kfree(pmu->base.attr_groups);
> -	if (!is_igp(i915))
> +	if (IS_DGFX(i915))
>   		kfree(pmu->name);
>   	free_event_attributes(pmu);
>   }