linux-kernel - [PATCH 09/11] drm/xe/vram: Use pci_rebar_get_max

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Message-Id: <20250911075605.5277-10-ilpo.jarvinen@linux.intel.com>
Date: Thu, 11 Sep 2025 10:56:03 +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 09/11] drm/xe/vram: Use pci_rebar_get_max_size()

Use pci_rebar_get_max_size() from PCI core in resize_vram_bar() to
simplify code.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/gpu/drm/xe/xe_vram.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_vram.c b/drivers/gpu/drm/xe/xe_vram.c
index 08a9abebfee7..b063c072df1e 100644
--- a/drivers/gpu/drm/xe/xe_vram.c
+++ b/drivers/gpu/drm/xe/xe_vram.c
@@ -53,16 +53,11 @@ static void resize_vram_bar(struct xe_device *xe)
 	resource_size_t current_size;
 	resource_size_t rebar_size;
 	struct resource *root_res;
-	u32 bar_size_mask;
+	int max_size, i;
 	u32 pci_cmd;
-	int i;
 
 	/* gather some relevant info */
 	current_size = pci_resource_len(pdev, LMEM_BAR);
-	bar_size_mask = pci_rebar_get_possible_sizes(pdev, LMEM_BAR);
-
-	if (!bar_size_mask)
-		return;
 
 	if (force_vram_bar_size < 0)
 		return;
@@ -76,7 +71,8 @@ static void resize_vram_bar(struct xe_device *xe)
 			drm_info(&xe->drm,
 				 "Requested size: %lluMiB is not supported by rebar sizes: 0x%x. Leaving default: %lluMiB\n",
 				 (u64)pci_rebar_size_to_bytes(rebar_size) >> 20,
-				 bar_size_mask, (u64)current_size >> 20);
+				 pci_rebar_get_possible_sizes(pdev, LMEM_BAR),
+				 (u64)current_size >> 20);
 			return;
 		}
 
@@ -84,7 +80,10 @@ static void resize_vram_bar(struct xe_device *xe)
 		if (rebar_size == current_size)
 			return;
 	} else {
-		rebar_size = pci_rebar_size_to_bytes(__fls(bar_size_mask));
+		max_size = pci_rebar_get_max_size(pdev, LMEM_BAR);
+		if (max_size < 0)
+			return;
+		rebar_size = pci_rebar_size_to_bytes(max_size);
 
 		/* only resize if larger than current */
 		if (rebar_size <= current_size)
-- 
2.39.5