linux-kernel - [PATCH 1/4] x86: move a check out of pci_xen_swiotlb

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Date:   Thu, 18 May 2023 15:42:50 +0200
From:   Christoph Hellwig <hch@....de>
To:     Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Ben Skeggs <bskeggs@...hat.com>,
        Karol Herbst <kherbst@...hat.com>,
        Lyude Paul <lyude@...hat.com>
Cc:     xen-devel@...ts.xenproject.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, nouveau@...ts.freedesktop.org
Subject: [PATCH 1/4] x86: move a check out of pci_xen_swiotlb_init

Move the exact checks when to initialize the Xen swiotlb code out
of pci_xen_swiotlb_init and into the caller so that is uses readable
positive checks, rather than negative ones that will get even more
confusing with another addition.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/x86/kernel/pci-dma.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index de6be0a3965ee4..f887b08ac5ffe4 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -74,8 +74,6 @@ static inline void __init pci_swiotlb_detect(void)
 #ifdef CONFIG_SWIOTLB_XEN
 static void __init pci_xen_swiotlb_init(void)
 {
-	if (!xen_initial_domain() && !x86_swiotlb_enable)
-		return;
 	x86_swiotlb_enable = true;
 	x86_swiotlb_flags |= SWIOTLB_ANY;
 	swiotlb_init_remap(true, x86_swiotlb_flags, xen_swiotlb_fixup);
@@ -113,7 +111,8 @@ static inline void __init pci_xen_swiotlb_init(void)
 void __init pci_iommu_alloc(void)
 {
 	if (xen_pv_domain()) {
-		pci_xen_swiotlb_init();
+		if (xen_initial_domain() || x86_swiotlb_enable)
+			pci_xen_swiotlb_init();
 		return;
 	}
 	pci_swiotlb_detect();
-- 
2.39.2