linux-kernel - [PATCH 06/11] drm/i915/gt: Use pci_rebar_size

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Message-Id: <20250911075605.5277-7-ilpo.jarvinen@linux.intel.com>
Date: Thu, 11 Sep 2025 10:56:00 +0300
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: linux-pci@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Christian König <christian.koenig@....com>,
	Michał Winiarski <michal.winiarski@...el.com>,
	Alex Deucher <alexander.deucher@....com>,
	amd-gfx@...ts.freedesktop.org,
	David Airlie <airlied@...il.com>,
	dri-devel@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org,
	intel-xe@...ts.freedesktop.org,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Simona Vetter <simona@...ll.ch>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	?UTF-8?q?Thomas=20Hellstr=C3=B6m?= <thomas.hellstrom@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Cc: linux-doc@...r.kernel.org,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 06/11] drm/i915/gt: Use pci_rebar_size_supported()

PCI core provides pci_rebar_size_supported() that helps in checking if
a BAR Size is supported for the BAR or not. Use it in
i915_resize_lmem_bar() to simplify code.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_region_lmem.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index 51bb27e10a4f..69c65fc8a72d 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -61,16 +61,12 @@ static void i915_resize_lmem_bar(struct drm_i915_private *i915, resource_size_t
 	current_size = roundup_pow_of_two(pci_resource_len(pdev, GEN12_LMEM_BAR));
 
 	if (i915->params.lmem_bar_size) {
-		u32 bar_sizes;
-
-		rebar_size = i915->params.lmem_bar_size *
-			(resource_size_t)SZ_1M;
-		bar_sizes = pci_rebar_get_possible_sizes(pdev, GEN12_LMEM_BAR);
-
+		rebar_size = i915->params.lmem_bar_size * (resource_size_t)SZ_1M;
 		if (rebar_size == current_size)
 			return;
 
-		if (!(bar_sizes & BIT(pci_rebar_bytes_to_size(rebar_size))) ||
+		if (!pci_rebar_size_supported(pdev, GEN12_LMEM_BAR,
+					      pci_rebar_bytes_to_size(rebar_size)) ||
 		    rebar_size >= roundup_pow_of_two(lmem_size)) {
 			rebar_size = lmem_size;
 
-- 
2.39.5