[+cc Keith, Jonathan (VMD guys)]
I'm OK with this from a PCI perspective. It would be nice if
dma_domain_list
dma_domain_list_lock
add_dma_domain()
del_dma_domain()
set_dma_domain_ops()
could all be moved to vmd.c, since they're really only used there.
But we don't really have a good way to call host bridge-specific code
like set_dma_domain_ops() except via pcibios_add_device(). Someday
maybe pcibios_add_device() will become a host bridge method.
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
On Wed, Apr 10, 2019 at 10:16:17AM +0200, Ingo Molnar wrote:
> (+Cc. Patch quoted below. Acked-by from an x86 perspective.)
>
> * Christoph Hellwig <hch@xxxxxx> wrote:
>
> > 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.
> >
> > Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> > ---
> > 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 38c62ff8a3f0..d8e2e6519a61 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
> > @@ -2877,7 +2875,6 @@ 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)
> > --
> > 2.20.1
> >
