linux-kernel - [PATCH 5.11 482/775] PCI: rcar: Always allocate MSI addresses in 32bit space

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Date:   Mon,  1 Mar 2021 17:10:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        linux-renesas-soc@...r.kernel.org, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 482/775] PCI: rcar: Always allocate MSI addresses in 32bit space

From: Marek Vasut <marek.vasut+renesas@...il.com>

[ Upstream commit c4e0fec2f7ee013dbf86445394ff47f719408f99 ]

This fixes MSI operation on legacy PCI cards, which cannot issue 64bit MSIs.
The R-Car controller only has one MSI trigger address instead of two, one
for 64bit and one for 32bit MSI, set the address to 32bit PCIe space so that
legacy PCI cards can also trigger MSIs.

Link: https://lore.kernel.org/r/20201016120431.7062-1-marek.vasut@gmail.com
Fixes: 290c1fb35860 ("PCI: rcar: Add MSI support for PCIe")
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Marek Vasut <marek.vasut+renesas@...il.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Wolfram Sang <wsa@...-dreams.de>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc: linux-renesas-soc@...r.kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/controller/pcie-rcar-host.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
index 4d1c4b24e5370..a728e8f9ad3c8 100644
--- a/drivers/pci/controller/pcie-rcar-host.c
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -735,7 +735,7 @@ static int rcar_pcie_enable_msi(struct rcar_pcie_host *host)
 	}
 
 	/* setup MSI data target */
-	msi->pages = __get_free_pages(GFP_KERNEL, 0);
+	msi->pages = __get_free_pages(GFP_KERNEL | GFP_DMA32, 0);
 	rcar_pcie_hw_enable_msi(host);
 
 	return 0;
-- 
2.27.0