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SubjectRE: [PATCH v4 09/12] vfio: split vfio_pci_private.h into two files
Date
Thanks, Alex. All the four comments accepted. :-) Will apply your suggested
patch in new version. :-)

Regards,
Yi Liu

> From: Alex Williamson [mailto:alex.williamson@redhat.com]
> Sent: Friday, January 10, 2020 6:49 AM
> To: Liu, Yi L <yi.l.liu@intel.com>
> Subject: Re: [PATCH v4 09/12] vfio: split vfio_pci_private.h into two files
>
> On Tue, 7 Jan 2020 20:01:46 +0800
> Liu Yi L <yi.l.liu@intel.com> wrote:
>
> > This patch splits the vfio_pci_private.h to be a private file in
> > drivers/vfio/pci and a common file under include/linux/. It is a
> > preparation for supporting vfio_pci common code sharing outside
> > drivers/vfio/pci/.
> >
> > The common header file is shrunk from the previous copied
> > vfio_pci_common.h. The original vfio_pci_private.h is shrunk
> > accordingly as well.
> >
> > Cc: Kevin Tian <kevin.tian@intel.com>
> > Cc: Lu Baolu <baolu.lu@linux.intel.com>
> > Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
> > ---
> > drivers/vfio/pci/vfio_pci_private.h | 133 +-----------------------------------
> > include/linux/vfio_pci_common.h | 86 ++---------------------
> > 2 files changed, 7 insertions(+), 212 deletions(-)
> >
> > diff --git a/drivers/vfio/pci/vfio_pci_private.h
> > b/drivers/vfio/pci/vfio_pci_private.h
> > index 499dd04..c4976a9 100644
> > --- a/drivers/vfio/pci/vfio_pci_private.h
> > +++ b/drivers/vfio/pci/vfio_pci_private.h
> > @@ -12,6 +12,7 @@
> > #include <linux/pci.h>
> > #include <linux/irqbypass.h>
> > #include <linux/types.h>
> > +#include <linux/vfio_pci_common.h>
> >
> > #ifndef VFIO_PCI_PRIVATE_H
> > #define VFIO_PCI_PRIVATE_H
> > @@ -39,121 +40,12 @@ struct vfio_pci_ioeventfd {
> > int count;
> > };
> >
> > -struct vfio_pci_irq_ctx {
> > - struct eventfd_ctx *trigger;
> > - struct virqfd *unmask;
> > - struct virqfd *mask;
> > - char *name;
> > - bool masked;
> > - struct irq_bypass_producer producer;
> > -};
>
> I think this can stay here, vfio_pci_common.h just needs a forward declaration.
>
> > -
> > -struct vfio_pci_device;
> > -struct vfio_pci_region;
> > -
> > -struct vfio_pci_regops {
> > - size_t (*rw)(struct vfio_pci_device *vdev, char __user *buf,
> > - size_t count, loff_t *ppos, bool iswrite);
> > - void (*release)(struct vfio_pci_device *vdev,
> > - struct vfio_pci_region *region);
> > - int (*mmap)(struct vfio_pci_device *vdev,
> > - struct vfio_pci_region *region,
> > - struct vm_area_struct *vma);
> > - int (*add_capability)(struct vfio_pci_device *vdev,
> > - struct vfio_pci_region *region,
> > - struct vfio_info_cap *caps);
> > -};
> > -
> > -struct vfio_pci_region {
> > - u32 type;
> > - u32 subtype;
> > - const struct vfio_pci_regops *ops;
> > - void *data;
> > - size_t size;
> > - u32 flags;
> > -};
> > -
> > struct vfio_pci_dummy_resource {
> > struct resource resource;
> > int index;
> > struct list_head res_next;
> > };
> >
> > -struct vfio_pci_reflck {
> > - struct kref kref;
> > - struct mutex lock;
> > -};
>
> I think we can abstract this a little further to make it unnecessary to put this in
> common as well. See attached.
>
> > -
> > -struct vfio_pci_device {
> > - struct pci_dev *pdev;
> > - void __iomem *barmap[PCI_STD_NUM_BARS];
> > - bool bar_mmap_supported[PCI_STD_NUM_BARS];
> > - u8 *pci_config_map;
> > - u8 *vconfig;
> > - struct perm_bits *msi_perm;
> > - spinlock_t irqlock;
> > - struct mutex igate;
> > - struct vfio_pci_irq_ctx *ctx;
> > - int num_ctx;
> > - int irq_type;
> > - int num_regions;
> > - struct vfio_pci_region *region;
> > - u8 msi_qmax;
> > - u8 msix_bar;
> > - u16 msix_size;
> > - u32 msix_offset;
> > - u32 rbar[7];
> > - bool pci_2_3;
> > - bool virq_disabled;
> > - bool reset_works;
> > - bool extended_caps;
> > - bool bardirty;
> > - bool has_vga;
> > - bool needs_reset;
> > - bool nointx;
> > - bool needs_pm_restore;
> > - struct pci_saved_state *pci_saved_state;
> > - struct pci_saved_state *pm_save;
> > - struct vfio_pci_reflck *reflck;
> > - int refcnt;
> > - int ioeventfds_nr;
> > - struct eventfd_ctx *err_trigger;
> > - struct eventfd_ctx *req_trigger;
> > - struct list_head dummy_resources_list;
> > - struct mutex ioeventfds_lock;
> > - struct list_head ioeventfds_list;
> > - bool nointxmask;
> > -#ifdef CONFIG_VFIO_PCI_VGA
> > - bool disable_vga;
> > -#endif
> > - bool disable_idle_d3;
> > -};
> > -
> > -#define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX)
> > -#define is_msi(vdev) (vdev->irq_type == VFIO_PCI_MSI_IRQ_INDEX)
> > -#define is_msix(vdev) (vdev->irq_type == VFIO_PCI_MSIX_IRQ_INDEX)
> > -#define is_irq_none(vdev) (!(is_intx(vdev) || is_msi(vdev) ||
> > is_msix(vdev))) -#define irq_is(vdev, type) (vdev->irq_type == type)
>
> I think these can stay in the private header too.
>
> > -
> > -extern const struct pci_error_handlers vfio_err_handlers;
> > -
> > -static inline bool vfio_pci_is_vga(struct pci_dev *pdev) -{
> > - return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
> > -}
> > -
> > -static inline bool vfio_vga_disabled(struct vfio_pci_device *vdev) -{
> > -#ifdef CONFIG_VFIO_PCI_VGA
> > - return vdev->disable_vga;
> > -#else
> > - return true;
> > -#endif
> > -}
>
> vfio_vga_disabled() is only used in vfio_pci_common.c, I think it can remain in
> private.
>
> > -
> > -extern void vfio_pci_refresh_config(struct vfio_pci_device *vdev,
> > - bool nointxmask, bool disable_idle_d3);
> > -
> > extern void vfio_pci_intx_mask(struct vfio_pci_device *vdev); extern
> > void vfio_pci_intx_unmask(struct vfio_pci_device *vdev);
> >
> > @@ -180,29 +72,6 @@ extern void vfio_pci_uninit_perm_bits(void);
> > extern int vfio_config_init(struct vfio_pci_device *vdev); extern
> > void vfio_config_free(struct vfio_pci_device *vdev);
> >
> > -extern int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
> > - unsigned int type, unsigned int subtype,
> > - const struct vfio_pci_regops *ops,
> > - size_t size, u32 flags, void *data);
> > -
> > -extern int vfio_pci_set_power_state(struct vfio_pci_device *vdev,
> > - pci_power_t state);
> > -extern unsigned int vfio_pci_set_vga_decode(void *opaque, bool
> > single_vga); -extern int vfio_pci_enable(struct vfio_pci_device
> > *vdev); -extern void vfio_pci_disable(struct vfio_pci_device *vdev);
> > -extern long vfio_pci_ioctl(void *device_data,
> > - unsigned int cmd, unsigned long arg);
> > -extern ssize_t vfio_pci_read(void *device_data, char __user *buf,
> > - size_t count, loff_t *ppos);
> > -extern ssize_t vfio_pci_write(void *device_data, const char __user *buf,
> > - size_t count, loff_t *ppos);
> > -extern int vfio_pci_mmap(void *device_data, struct vm_area_struct
> > *vma); -extern void vfio_pci_request(void *device_data, unsigned int
> > count); -extern void vfio_pci_fill_ids(char *ids, struct pci_driver
> > *driver); -extern int vfio_pci_reflck_attach(struct vfio_pci_device
> > *vdev); -extern void vfio_pci_reflck_put(struct vfio_pci_reflck
> > *reflck); -extern void vfio_pci_probe_power_state(struct
> > vfio_pci_device *vdev);
> > -
> > #ifdef CONFIG_VFIO_PCI_IGD
> > extern int vfio_pci_igd_init(struct vfio_pci_device *vdev); #else
> > diff --git a/include/linux/vfio_pci_common.h
> > b/include/linux/vfio_pci_common.h index 499dd04..862cd80 100644
> > --- a/include/linux/vfio_pci_common.h
> > +++ b/include/linux/vfio_pci_common.h
> > @@ -1,5 +1,8 @@
> > /* SPDX-License-Identifier: GPL-2.0-only */
> > /*
> > + * VFIO PCI API definition
> > + *
> > + * Derived from original vfio/pci/vfio_pci_private.h:
> > * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
> > * Author: Alex Williamson <alex.williamson@redhat.com>
> > *
> > @@ -13,31 +16,8 @@
> > #include <linux/irqbypass.h>
> > #include <linux/types.h>
> >
> > -#ifndef VFIO_PCI_PRIVATE_H
> > -#define VFIO_PCI_PRIVATE_H
> > -
> > -#define VFIO_PCI_OFFSET_SHIFT 40
> > -
> > -#define VFIO_PCI_OFFSET_TO_INDEX(off) (off >> VFIO_PCI_OFFSET_SHIFT)
> > -#define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) <<
> VFIO_PCI_OFFSET_SHIFT)
> > -#define VFIO_PCI_OFFSET_MASK (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
> > -
> > -/* Special capability IDs predefined access */
> > -#define PCI_CAP_ID_INVALID 0xFF /* default raw access */
> > -#define PCI_CAP_ID_INVALID_VIRT 0xFE /* default virt access */
> > -
> > -/* Cap maximum number of ioeventfds per device (arbitrary) */
> > -#define VFIO_PCI_IOEVENTFD_MAX 1000
> > -
> > -struct vfio_pci_ioeventfd {
> > - struct list_head next;
> > - struct virqfd *virqfd;
> > - void __iomem *addr;
> > - uint64_t data;
> > - loff_t pos;
> > - int bar;
> > - int count;
> > -};
> > +#ifndef VFIO_PCI_COMMON_H
> > +#define VFIO_PCI_COMMON_H
> >
> > struct vfio_pci_irq_ctx {
> > struct eventfd_ctx *trigger;
> > @@ -73,12 +53,6 @@ struct vfio_pci_region {
> > u32 flags;
> > };
> >
> > -struct vfio_pci_dummy_resource {
> > - struct resource resource;
> > - int index;
> > - struct list_head res_next;
> > -};
> > -
> > struct vfio_pci_reflck {
> > struct kref kref;
> > struct mutex lock;
> > @@ -154,32 +128,6 @@ static inline bool vfio_vga_disabled(struct
> > vfio_pci_device *vdev) extern void vfio_pci_refresh_config(struct vfio_pci_device
> *vdev,
> > bool nointxmask, bool disable_idle_d3);
> >
> > -extern void vfio_pci_intx_mask(struct vfio_pci_device *vdev); -extern
> > void vfio_pci_intx_unmask(struct vfio_pci_device *vdev);
> > -
> > -extern int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev,
> > - uint32_t flags, unsigned index,
> > - unsigned start, unsigned count, void *data);
> > -
> > -extern ssize_t vfio_pci_config_rw(struct vfio_pci_device *vdev,
> > - char __user *buf, size_t count,
> > - loff_t *ppos, bool iswrite);
> > -
> > -extern ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf,
> > - size_t count, loff_t *ppos, bool iswrite);
> > -
> > -extern ssize_t vfio_pci_vga_rw(struct vfio_pci_device *vdev, char __user *buf,
> > - size_t count, loff_t *ppos, bool iswrite);
> > -
> > -extern long vfio_pci_ioeventfd(struct vfio_pci_device *vdev, loff_t offset,
> > - uint64_t data, int count, int fd);
> > -
> > -extern int vfio_pci_init_perm_bits(void); -extern void
> > vfio_pci_uninit_perm_bits(void);
> > -
> > -extern int vfio_config_init(struct vfio_pci_device *vdev); -extern
> > void vfio_config_free(struct vfio_pci_device *vdev);
> > -
> > extern int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
> > unsigned int type, unsigned int subtype,
> > const struct vfio_pci_regops *ops, @@ -
> 203,26 +151,4 @@ extern
> > int vfio_pci_reflck_attach(struct vfio_pci_device *vdev); extern void
> > vfio_pci_reflck_put(struct vfio_pci_reflck *reflck); extern void
> > vfio_pci_probe_power_state(struct vfio_pci_device *vdev);
> >
> > -#ifdef CONFIG_VFIO_PCI_IGD
> > -extern int vfio_pci_igd_init(struct vfio_pci_device *vdev); -#else
> > -static inline int vfio_pci_igd_init(struct vfio_pci_device *vdev) -{
> > - return -ENODEV;
> > -}
> > -#endif
> > -#ifdef CONFIG_VFIO_PCI_NVLINK2
> > -extern int vfio_pci_nvdia_v100_nvlink2_init(struct vfio_pci_device
> > *vdev); -extern int vfio_pci_ibm_npu2_init(struct vfio_pci_device
> > *vdev); -#else -static inline int
> > vfio_pci_nvdia_v100_nvlink2_init(struct vfio_pci_device *vdev) -{
> > - return -ENODEV;
> > -}
> > -
> > -static inline int vfio_pci_ibm_npu2_init(struct vfio_pci_device
> > *vdev) -{
> > - return -ENODEV;
> > -}
> > -#endif
> > -#endif /* VFIO_PCI_PRIVATE_H */
> > +#endif /* VFIO_PCI_COMMON_H */

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