linux-kernel - [tip:x86/cleanups] x86/pci: Clean up usage of X86_DEV_DMA

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Date:   Wed, 24 Apr 2019 05:37:12 -0700
From:   tip-bot for Christoph Hellwig <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, tglx@...utronix.de, bhelgaas@...gle.com,
        bp@...en8.de, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, hch@....de, hpa@...or.com,
        peterz@...radead.org
Subject: [tip:x86/cleanups] x86/pci: Clean up usage of X86_DEV_DMA_OPS

Commit-ID:  15854edd193ae5d9daf8f50ce5f9f1724cebe344
Gitweb:     https://git.kernel.org/tip/15854edd193ae5d9daf8f50ce5f9f1724cebe344
Author:     Christoph Hellwig <hch@....de>
AuthorDate: Wed, 10 Apr 2019 10:02:20 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 24 Apr 2019 13:12:05 +0200

x86/pci: Clean up usage of X86_DEV_DMA_OPS

We have supported per-device dma_map_ops in generic code for a long
time, and this symbol just guards the inclusion of the dma_map_ops
registry used for vmd.  Stop enabling it for anything but vmd.

No change in functionality intended.

Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20190410080220.21705-3-hch@lst.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/Kconfig               | 3 ---
 drivers/misc/mic/Kconfig       | 4 ++--
 drivers/pci/controller/Kconfig | 1 +
 drivers/pci/controller/vmd.c   | 7 -------
 4 files changed, 3 insertions(+), 12 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 7f93e013e6db..60f6459344bc 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -28,7 +28,6 @@ config X86_64
 	select MODULES_USE_ELF_RELA
 	select NEED_DMA_MAP_STATE
 	select SWIOTLB
-	select X86_DEV_DMA_OPS
 	select ARCH_HAS_SYSCALL_WRAPPER
 
 #
@@ -703,7 +702,6 @@ config STA2X11
 	bool "STA2X11 Companion Chip Support"
 	depends on X86_32_NON_STANDARD && PCI
 	select ARCH_HAS_PHYS_TO_DMA
-	select X86_DEV_DMA_OPS
 	select SWIOTLB
 	select MFD_STA2X11
 	select GPIOLIB
@@ -2883,7 +2881,6 @@ config HAVE_ATOMIC_IOMAP
 
 config X86_DEV_DMA_OPS
 	bool
-	depends on X86_64 || STA2X11
 
 config HAVE_GENERIC_GUP
 	def_bool y
diff --git a/drivers/misc/mic/Kconfig b/drivers/misc/mic/Kconfig
index 242dcee14689..6736f72cc14a 100644
--- a/drivers/misc/mic/Kconfig
+++ b/drivers/misc/mic/Kconfig
@@ -4,7 +4,7 @@ comment "Intel MIC Bus Driver"
 
 config INTEL_MIC_BUS
 	tristate "Intel MIC Bus Driver"
-	depends on 64BIT && PCI && X86 && X86_DEV_DMA_OPS
+	depends on 64BIT && PCI && X86
 	help
 	  This option is selected by any driver which registers a
 	  device or driver on the MIC Bus, such as CONFIG_INTEL_MIC_HOST,
@@ -21,7 +21,7 @@ comment "SCIF Bus Driver"
 
 config SCIF_BUS
 	tristate "SCIF Bus Driver"
-	depends on 64BIT && PCI && X86 && X86_DEV_DMA_OPS
+	depends on 64BIT && PCI && X86
 	help
 	  This option is selected by any driver which registers a
 	  device or driver on the SCIF Bus, such as CONFIG_INTEL_MIC_HOST
diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 6012f3059acd..011c57cae4b0 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -267,6 +267,7 @@ config PCIE_TANGO_SMP8759
 
 config VMD
 	depends on PCI_MSI && X86_64 && SRCU
+	select X86_DEV_DMA_OPS
 	tristate "Intel Volume Management Device Driver"
 	---help---
 	  Adds support for the Intel Volume Management Device (VMD). VMD is a
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index cf6816b55b5e..999a5509e57e 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -95,10 +95,8 @@ struct vmd_dev {
 	struct irq_domain	*irq_domain;
 	struct pci_bus		*bus;
 
-#ifdef CONFIG_X86_DEV_DMA_OPS
 	struct dma_map_ops	dma_ops;
 	struct dma_domain	dma_domain;
-#endif
 };
 
 static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus)
@@ -293,7 +291,6 @@ static struct msi_domain_info vmd_msi_domain_info = {
 	.chip		= &vmd_msi_controller,
 };
 
-#ifdef CONFIG_X86_DEV_DMA_OPS
 /*
  * VMD replaces the requester ID with its own.  DMA mappings for devices in a
  * VMD domain need to be mapped for the VMD, not the device requiring
@@ -438,10 +435,6 @@ static void vmd_setup_dma_ops(struct vmd_dev *vmd)
 	add_dma_domain(domain);
 }
 #undef ASSIGN_VMD_DMA_OPS
-#else
-static void vmd_teardown_dma_ops(struct vmd_dev *vmd) {}
-static void vmd_setup_dma_ops(struct vmd_dev *vmd) {}
-#endif
 
 static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus,
 				  unsigned int devfn, int reg, int len)