netdev - [PATCH 3/5] drm/radeon: Raise msi_addr_mask to 40 bits for pre-Bonaire

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Message-Id: <20251224-pci-msi-addr-mask-v1-3-05a6fcb4b4c0@iscas.ac.cn>
Date: Wed, 24 Dec 2025 11:10:51 +0800
From: Vivian Wang <wangruikang@...as.ac.cn>
To: Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>, 
 Alex Deucher <alexander.deucher@....com>, 
 Christian König <christian.koenig@....com>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Brett Creeley <brett.creeley@....com>, Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, Jaroslav Kysela <perex@...ex.cz>, 
 Takashi Iwai <tiwai@...e.com>
Cc: Han Gao <gaohan@...as.ac.cn>, linuxppc-dev@...ts.ozlabs.org, 
 linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org, 
 dri-devel@...ts.freedesktop.org, netdev@...r.kernel.org, 
 linux-pci@...r.kernel.org, linux-sound@...r.kernel.org, 
 Vivian Wang <wangruikang@...as.ac.cn>
Subject: [PATCH 3/5] drm/radeon: Raise msi_addr_mask to 40 bits for
 pre-Bonaire

The code was originally written using no_64bit_msi, which restricts the
device to 32-bit MSI addresses.

Since msi_addr_mask is introduced, use DMA_BIT_MASK(40) instead of
DMA_BIT_MASK(32) here for msi_addr_mask, describing the restriction more
precisely and allowing these devices to work on platforms with MSI
doorbell address above 32-bit space, as long as it is within the
hardware restriction of 40-bit space.

Signed-off-by: Vivian Wang <wangruikang@...as.ac.cn>
---
 drivers/gpu/drm/radeon/radeon_irq_kms.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index d550554a6f3f..ea519d43348b 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -251,8 +251,8 @@ static bool radeon_msi_ok(struct radeon_device *rdev)
 	 * IBM POWER servers, so we limit them
 	 */
 	if (rdev->family < CHIP_BONAIRE) {
-		dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n");
-		rdev->pdev->msi_addr_mask = DMA_BIT_MASK(32);
+		dev_info(rdev->dev, "radeon: MSI limited to 40-bit\n");
+		rdev->pdev->msi_addr_mask = DMA_BIT_MASK(40);
 	}

 	/* force MSI on */

-- 
2.51.2