linux-kernel - [PATCH 3/5] x86/pci: Replace the vmd_domain field with a vmd

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Date:   Wed, 28 Aug 2019 16:14:41 +0200
From:   Christoph Hellwig <hch@....de>
To:     Keith Busch <kbusch@...nel.org>,
        "Derrick, Jonathan" <jonathan.derrick@...el.com>
Cc:     x86@...nel.org, joro@...tes.org, linux-pci@...r.kernel.org,
        bhelgaas@...gle.com, dwmw2@...radead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] x86/pci: Replace the vmd_domain field with a vmd_dev pointer

Store the actual VMD device in struct pci_sysdata, so that we can later
use it directly for DMA mappings.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/x86/include/asm/pci.h   | 5 ++---
 drivers/pci/controller/vmd.c | 2 +-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 75fe28492290..a9bb4cdb66d4 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -25,7 +25,7 @@ struct pci_sysdata {
 	void		*fwnode;	/* IRQ domain for MSI assignment */
 #endif
 #if IS_ENABLED(CONFIG_VMD)
-	bool vmd_domain;		/* True if in Intel VMD domain */
+	struct device	*vmd_dev;	/* Main device if in Intel VMD domain */
 #endif
 };
 
@@ -64,12 +64,11 @@ static inline void *_pci_root_bus_fwnode(struct pci_bus *bus)
 #if IS_ENABLED(CONFIG_VMD)
 static inline bool is_vmd(struct pci_bus *bus)
 {
-	return to_pci_sysdata(bus)->vmd_domain;
+	return to_pci_sysdata(bus)->vmd_dev != NULL;
 }
 #else
 #define is_vmd(bus)		false
 #endif /* CONFIG_VMD */
-}
 
 /* Can be used to override the logic in pci_scan_bus for skipping
    already-configured bus numbers - to be used for buggy BIOSes
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index 4575e0c6dc4b..785cb657c8c2 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -660,7 +660,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
 		.parent = res,
 	};
 
-	sd->vmd_domain = true;
+	sd->vmd_dev = &vmd->dev->dev;
 	sd->domain = vmd_find_free_domain();
 	if (sd->domain < 0)
 		return sd->domain;
-- 
2.20.1