| Message ID | 20170112071947.98071-12-bjsdjshi@linux.vnet.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, 12 Jan 2017 08:19:43 +0100 Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> wrote: > Realize VFIO_DEVICE_GET_IRQ_INFO ioctl to retrieve > VFIO_CCW_IO_IRQ information. > > Realize VFIO_DEVICE_SET_IRQS ioctl to set an eventfd fd for > VFIO_CCW_IO_IRQ. Once a write operation to the ccw_io_region > was performed, trigger a signal on this fd. > > Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> > Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com> > --- > drivers/s390/cio/vfio_ccw_ops.c | 125 +++++++++++++++++++++++++++++++++++- > drivers/s390/cio/vfio_ccw_private.h | 4 ++ > include/uapi/linux/vfio.h | 10 ++- > 3 files changed, 136 insertions(+), 3 deletions(-) > > diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c > index b702735..3c47eb6 100644 > --- a/drivers/s390/cio/vfio_ccw_ops.c > +++ b/drivers/s390/cio/vfio_ccw_ops.c > @@ -203,6 +203,9 @@ static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev, > if (region->ret_code != 0) > return region->ret_code; > > + if (private->io_trigger) > + eventfd_signal(private->io_trigger, 1); > + > return count; > } > > @@ -211,7 +214,7 @@ static int vfio_ccw_mdev_get_device_info(struct mdev_device *mdev, > { > info->flags = VFIO_DEVICE_FLAGS_CCW | VFIO_DEVICE_FLAGS_RESET; > info->num_regions = VFIO_CCW_NUM_REGIONS; > - info->num_irqs = 0; > + info->num_irqs = VFIO_CCW_NUM_IRQS; > > return 0; > } > @@ -233,6 +236,84 @@ static int vfio_ccw_mdev_get_region_info(struct mdev_device *mdev, > } > } > > +int vfio_ccw_mdev_get_irq_info(struct mdev_device *mdev, > + struct vfio_irq_info *info) > +{ > + if (info->index != VFIO_CCW_IO_IRQ_INDEX) > + return -EINVAL; > + > + info->count = VFIO_CCW_NUM_IRQS; > + info->flags = VFIO_IRQ_INFO_EVENTFD | VFIO_IRQ_INFO_NORESIZE; VFIO_CCW_NUM_IRQS is not being used correctly here, info->count is the number of interrupts within this index, VFIO_CCW_NUM_IRQS is the number of indexes. This is meant to handle things like PCI where we have 3 different interrupts types (INTx, MSI, MSI-X) and some of those (MSI/X) support multiple vectors. In this case I think you want info->count = 1 and you don't need the NORESIZE flag since that only makes sense for describing indexes where a subset of the available vectors may be enabled. So info->count comes out to the same thing, but should not use the same macro to get there. > + > + return 0; > +} > + > +static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev, > + uint32_t flags, > + void __user *data) > +{ > + struct vfio_ccw_private *private; > + struct eventfd_ctx **ctx; > + > + if (!(flags & VFIO_IRQ_SET_ACTION_TRIGGER)) > + return -EINVAL; > + > + private = dev_get_drvdata(mdev->dev.parent); > + if (!private) > + return -ENODEV; > + > + ctx = &private->io_trigger; > + > + switch (flags & VFIO_IRQ_SET_DATA_TYPE_MASK) { > + case VFIO_IRQ_SET_DATA_NONE: > + { > + if (*ctx) > + eventfd_signal(*ctx, 1); > + return 0; > + } > + case VFIO_IRQ_SET_DATA_BOOL: > + { > + uint8_t trigger; > + > + if (get_user(trigger, (uint8_t __user *)data)) > + return -EFAULT; > + > + if (trigger && *ctx) > + eventfd_signal(*ctx, 1); > + return 0; > + } > + case VFIO_IRQ_SET_DATA_EVENTFD: > + { > + int32_t fd; > + > + if (get_user(fd, (int32_t __user *)data)) > + return -EFAULT; > + > + if (fd == -1) { > + if (*ctx) > + eventfd_ctx_put(*ctx); > + *ctx = NULL; > + } else if (fd >= 0) { > + struct eventfd_ctx *efdctx; > + > + efdctx = eventfd_ctx_fdget(fd); > + if (IS_ERR(efdctx)) > + return PTR_ERR(efdctx); > + > + if (*ctx) > + eventfd_ctx_put(*ctx); > + > + *ctx = efdctx; > + } else > + return -EINVAL; > + > + return 0; > + } > + default: > + return -EINVAL; > + } > +} > + > static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, > unsigned int cmd, > unsigned long arg) > @@ -281,6 +362,48 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, > > return copy_to_user((void __user *)arg, &info, minsz); > } > + case VFIO_DEVICE_GET_IRQ_INFO: > + { > + struct vfio_irq_info info; > + > + minsz = offsetofend(struct vfio_irq_info, count); > + > + if (copy_from_user(&info, (void __user *)arg, minsz)) > + return -EFAULT; > + > + if (info.argsz < minsz || info.index >= VFIO_CCW_NUM_IRQS) > + return -EINVAL; > + > + ret = vfio_ccw_mdev_get_irq_info(mdev, &info); > + if (ret) > + return ret; > + > + if (info.count == -1) > + return -EINVAL; > + > + return copy_to_user((void __user *)arg, &info, minsz); > + } > + case VFIO_DEVICE_SET_IRQS: > + { > + struct vfio_irq_set hdr; > + size_t data_size; > + void __user *data; > + > + minsz = offsetofend(struct vfio_irq_set, count); > + > + if (copy_from_user(&hdr, (void __user *)arg, minsz)) > + return -EFAULT; > + > + ret = vfio_set_irqs_validate_and_prepare(&hdr, > + VFIO_CCW_NUM_IRQS, > + VFIO_CCW_NUM_IRQS, > + &data_size); This is another instance, max_irq_type is referring to the index while num_irqs is referring to the count of vectors within this index. VFIO_CCW_NUM_IRQS should only be used for max_irq_type. > + if (ret) > + return ret; > + > + data = (void __user *)(arg + minsz); > + return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, data); > + } > case VFIO_DEVICE_RESET: > return vfio_ccw_mdev_reset(mdev); > default: > diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h > index 4621934..d551d98 100644 > --- a/drivers/s390/cio/vfio_ccw_private.h > +++ b/drivers/s390/cio/vfio_ccw_private.h > @@ -15,6 +15,7 @@ > #define _VFIO_CCW_PRIVATE_H_ > > #include <linux/completion.h> > +#include <linux/eventfd.h> > #include <asm/vfio_ccw.h> > > #include "css.h" > @@ -32,6 +33,7 @@ > * @cp: ccw program for the current I/O operation > * @irb: irb info received from interrupt > * @scsw: scsw info > + * @io_trigger: eventfd ctx for signaling userspace I/O results > */ > struct vfio_ccw_private { > struct subchannel *sch; > @@ -45,6 +47,8 @@ struct vfio_ccw_private { > struct ccwprogram cp; > struct irb irb; > union scsw scsw; > + > + struct eventfd_ctx *io_trigger; > } __aligned(8); > > extern int vfio_ccw_mdev_reg(struct subchannel *sch); > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h > index 3fd70ff..ae46105 100644 > --- a/include/uapi/linux/vfio.h > +++ b/include/uapi/linux/vfio.h > @@ -449,8 +449,9 @@ enum { > }; > > /* > - * The vfio-ccw bus driver makes use of the following fixed region. > - * Unimplemented regions return a size of zero. > + * The vfio-ccw bus driver makes use of the following fixed region and > + * IRQ index mapping. Unimplemented regions return a size of zero. > + * Unimplemented IRQ types return a count of zero. > */ > > enum { > @@ -458,6 +459,11 @@ enum { > VFIO_CCW_NUM_REGIONS > }; > > +enum { > + VFIO_CCW_IO_IRQ_INDEX, > + VFIO_CCW_NUM_IRQS > +}; > + > /** > * VFIO_DEVICE_GET_PCI_HOT_RESET_INFO - _IORW(VFIO_TYPE, VFIO_BASE + 12, > * struct vfio_pci_hot_reset_info)
* Alex Williamson <alex.williamson@redhat.com> [2017-01-17 14:02:40 -0700]: > On Thu, 12 Jan 2017 08:19:43 +0100 > Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> wrote: > > > Realize VFIO_DEVICE_GET_IRQ_INFO ioctl to retrieve > > VFIO_CCW_IO_IRQ information. > > > > Realize VFIO_DEVICE_SET_IRQS ioctl to set an eventfd fd for > > VFIO_CCW_IO_IRQ. Once a write operation to the ccw_io_region > > was performed, trigger a signal on this fd. > > > > Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> > > Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com> > > --- > > drivers/s390/cio/vfio_ccw_ops.c | 125 +++++++++++++++++++++++++++++++++++- > > drivers/s390/cio/vfio_ccw_private.h | 4 ++ > > include/uapi/linux/vfio.h | 10 ++- > > 3 files changed, 136 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c > > index b702735..3c47eb6 100644 > > --- a/drivers/s390/cio/vfio_ccw_ops.c > > +++ b/drivers/s390/cio/vfio_ccw_ops.c > > @@ -203,6 +203,9 @@ static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev, > > if (region->ret_code != 0) > > return region->ret_code; > > > > + if (private->io_trigger) > > + eventfd_signal(private->io_trigger, 1); > > + > > return count; > > } > > > > @@ -211,7 +214,7 @@ static int vfio_ccw_mdev_get_device_info(struct mdev_device *mdev, > > { > > info->flags = VFIO_DEVICE_FLAGS_CCW | VFIO_DEVICE_FLAGS_RESET; > > info->num_regions = VFIO_CCW_NUM_REGIONS; > > - info->num_irqs = 0; > > + info->num_irqs = VFIO_CCW_NUM_IRQS; > > > > return 0; > > } > > @@ -233,6 +236,84 @@ static int vfio_ccw_mdev_get_region_info(struct mdev_device *mdev, > > } > > } > > > > +int vfio_ccw_mdev_get_irq_info(struct mdev_device *mdev, > > + struct vfio_irq_info *info) > > +{ > > + if (info->index != VFIO_CCW_IO_IRQ_INDEX) > > + return -EINVAL; > > + > > + info->count = VFIO_CCW_NUM_IRQS; > > + info->flags = VFIO_IRQ_INFO_EVENTFD | VFIO_IRQ_INFO_NORESIZE; > > > VFIO_CCW_NUM_IRQS is not being used correctly here, info->count is the > number of interrupts within this index, VFIO_CCW_NUM_IRQS is the number > of indexes. This is meant to handle things like PCI where we have 3 > different interrupts types (INTx, MSI, MSI-X) and some of those (MSI/X) > support multiple vectors. In this case I think you want info->count = > 1 and you don't need the NORESIZE flag since that only makes sense for > describing indexes where a subset of the available vectors may be > enabled. So info->count comes out to the same thing, but should not > use the same macro to get there. > Hi Alex, I indeed use VFIO_CCW_NUM_IRQS here in a wrong way. Thanks for your explanation. I will change it to: info->count = 1; > > + > > + return 0; > > +} > > + [...] > > @@ -281,6 +362,48 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, > > > > return copy_to_user((void __user *)arg, &info, minsz); > > } > > + case VFIO_DEVICE_GET_IRQ_INFO: > > + { > > + struct vfio_irq_info info; > > + > > + minsz = offsetofend(struct vfio_irq_info, count); > > + > > + if (copy_from_user(&info, (void __user *)arg, minsz)) > > + return -EFAULT; > > + > > + if (info.argsz < minsz || info.index >= VFIO_CCW_NUM_IRQS) > > + return -EINVAL; > > + > > + ret = vfio_ccw_mdev_get_irq_info(mdev, &info); > > + if (ret) > > + return ret; > > + > > + if (info.count == -1) > > + return -EINVAL; > > + > > + return copy_to_user((void __user *)arg, &info, minsz); > > + } > > + case VFIO_DEVICE_SET_IRQS: > > + { > > + struct vfio_irq_set hdr; > > + size_t data_size; > > + void __user *data; > > + > > + minsz = offsetofend(struct vfio_irq_set, count); > > + > > + if (copy_from_user(&hdr, (void __user *)arg, minsz)) > > + return -EFAULT; > > + > > + ret = vfio_set_irqs_validate_and_prepare(&hdr, > > + VFIO_CCW_NUM_IRQS, > > + VFIO_CCW_NUM_IRQS, > > + &data_size); > > > This is another instance, max_irq_type is referring to the index while > num_irqs is referring to the count of vectors within this index. > VFIO_CCW_NUM_IRQS should only be used for max_irq_type. Ok. Will use 1 instead of VFIO_CCW_NUM_IRQS for @num_irqs. > > > + if (ret) > > + return ret; > > + > > + data = (void __user *)(arg + minsz); > > + return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, data); > > + } > > case VFIO_DEVICE_RESET: > > return vfio_ccw_mdev_reset(mdev); > > default: [...]
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c index b702735..3c47eb6 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -203,6 +203,9 @@ static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev, if (region->ret_code != 0) return region->ret_code; + if (private->io_trigger) + eventfd_signal(private->io_trigger, 1); + return count; } @@ -211,7 +214,7 @@ static int vfio_ccw_mdev_get_device_info(struct mdev_device *mdev, { info->flags = VFIO_DEVICE_FLAGS_CCW | VFIO_DEVICE_FLAGS_RESET; info->num_regions = VFIO_CCW_NUM_REGIONS; - info->num_irqs = 0; + info->num_irqs = VFIO_CCW_NUM_IRQS; return 0; } @@ -233,6 +236,84 @@ static int vfio_ccw_mdev_get_region_info(struct mdev_device *mdev, } } +int vfio_ccw_mdev_get_irq_info(struct mdev_device *mdev, + struct vfio_irq_info *info) +{ + if (info->index != VFIO_CCW_IO_IRQ_INDEX) + return -EINVAL; + + info->count = VFIO_CCW_NUM_IRQS; + info->flags = VFIO_IRQ_INFO_EVENTFD | VFIO_IRQ_INFO_NORESIZE; + + return 0; +} + +static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev, + uint32_t flags, + void __user *data) +{ + struct vfio_ccw_private *private; + struct eventfd_ctx **ctx; + + if (!(flags & VFIO_IRQ_SET_ACTION_TRIGGER)) + return -EINVAL; + + private = dev_get_drvdata(mdev->dev.parent); + if (!private) + return -ENODEV; + + ctx = &private->io_trigger; + + switch (flags & VFIO_IRQ_SET_DATA_TYPE_MASK) { + case VFIO_IRQ_SET_DATA_NONE: + { + if (*ctx) + eventfd_signal(*ctx, 1); + return 0; + } + case VFIO_IRQ_SET_DATA_BOOL: + { + uint8_t trigger; + + if (get_user(trigger, (uint8_t __user *)data)) + return -EFAULT; + + if (trigger && *ctx) + eventfd_signal(*ctx, 1); + return 0; + } + case VFIO_IRQ_SET_DATA_EVENTFD: + { + int32_t fd; + + if (get_user(fd, (int32_t __user *)data)) + return -EFAULT; + + if (fd == -1) { + if (*ctx) + eventfd_ctx_put(*ctx); + *ctx = NULL; + } else if (fd >= 0) { + struct eventfd_ctx *efdctx; + + efdctx = eventfd_ctx_fdget(fd); + if (IS_ERR(efdctx)) + return PTR_ERR(efdctx); + + if (*ctx) + eventfd_ctx_put(*ctx); + + *ctx = efdctx; + } else + return -EINVAL; + + return 0; + } + default: + return -EINVAL; + } +} + static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, unsigned int cmd, unsigned long arg) @@ -281,6 +362,48 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, return copy_to_user((void __user *)arg, &info, minsz); } + case VFIO_DEVICE_GET_IRQ_INFO: + { + struct vfio_irq_info info; + + minsz = offsetofend(struct vfio_irq_info, count); + + if (copy_from_user(&info, (void __user *)arg, minsz)) + return -EFAULT; + + if (info.argsz < minsz || info.index >= VFIO_CCW_NUM_IRQS) + return -EINVAL; + + ret = vfio_ccw_mdev_get_irq_info(mdev, &info); + if (ret) + return ret; + + if (info.count == -1) + return -EINVAL; + + return copy_to_user((void __user *)arg, &info, minsz); + } + case VFIO_DEVICE_SET_IRQS: + { + struct vfio_irq_set hdr; + size_t data_size; + void __user *data; + + minsz = offsetofend(struct vfio_irq_set, count); + + if (copy_from_user(&hdr, (void __user *)arg, minsz)) + return -EFAULT; + + ret = vfio_set_irqs_validate_and_prepare(&hdr, + VFIO_CCW_NUM_IRQS, + VFIO_CCW_NUM_IRQS, + &data_size); + if (ret) + return ret; + + data = (void __user *)(arg + minsz); + return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, data); + } case VFIO_DEVICE_RESET: return vfio_ccw_mdev_reset(mdev); default: diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h index 4621934..d551d98 100644 --- a/drivers/s390/cio/vfio_ccw_private.h +++ b/drivers/s390/cio/vfio_ccw_private.h @@ -15,6 +15,7 @@ #define _VFIO_CCW_PRIVATE_H_ #include <linux/completion.h> +#include <linux/eventfd.h> #include <asm/vfio_ccw.h> #include "css.h" @@ -32,6 +33,7 @@ * @cp: ccw program for the current I/O operation * @irb: irb info received from interrupt * @scsw: scsw info + * @io_trigger: eventfd ctx for signaling userspace I/O results */ struct vfio_ccw_private { struct subchannel *sch; @@ -45,6 +47,8 @@ struct vfio_ccw_private { struct ccwprogram cp; struct irb irb; union scsw scsw; + + struct eventfd_ctx *io_trigger; } __aligned(8); extern int vfio_ccw_mdev_reg(struct subchannel *sch); diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 3fd70ff..ae46105 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -449,8 +449,9 @@ enum { }; /* - * The vfio-ccw bus driver makes use of the following fixed region. - * Unimplemented regions return a size of zero. + * The vfio-ccw bus driver makes use of the following fixed region and + * IRQ index mapping. Unimplemented regions return a size of zero. + * Unimplemented IRQ types return a count of zero. */ enum { @@ -458,6 +459,11 @@ enum { VFIO_CCW_NUM_REGIONS }; +enum { + VFIO_CCW_IO_IRQ_INDEX, + VFIO_CCW_NUM_IRQS +}; + /** * VFIO_DEVICE_GET_PCI_HOT_RESET_INFO - _IORW(VFIO_TYPE, VFIO_BASE + 12, * struct vfio_pci_hot_reset_info)