From 4e149e431a2858b86b4f9c801b2a4dde50c929f9 Mon Sep 17 00:00:00 2001 From: Dong Jia Shi Date: Fri, 17 Mar 2017 04:17:35 +0100 Subject: [PATCH] vfio: ccw: handle ccw command request We implement the basic ccw command handling infrastructure here: 1. Translate the ccw commands. 2. Issue the translated ccw commands to the device. 3. Once we get the execution result, update the guest SCSW with it. Acked-by: Pierre Morel Signed-off-by: Dong Jia Shi Message-Id: <20170317031743.40128-9-bjsdjshi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck --- drivers/s390/cio/vfio_ccw_drv.c | 114 ++++++++++++++++++++++++++++++++++++ drivers/s390/cio/vfio_ccw_ops.c | 24 ++++++-- drivers/s390/cio/vfio_ccw_private.h | 14 +++++ 3 files changed, 148 insertions(+), 4 deletions(-) diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c index b1f430a..b5971d3 100644 --- a/drivers/s390/cio/vfio_ccw_drv.c +++ b/drivers/s390/cio/vfio_ccw_drv.c @@ -11,9 +11,13 @@ #include #include #include +#include +#include #include +#include "ioasm.h" +#include "css.h" #include "vfio_ccw_private.h" /* @@ -59,6 +63,109 @@ out_unlock: return ret; } +static int doing_io(struct vfio_ccw_private *private, u32 intparm) +{ + return (private->intparm == intparm); +} + +static int vfio_ccw_sch_io_helper(struct vfio_ccw_private *private) +{ + struct subchannel *sch; + union orb *orb; + int ccode; + __u8 lpm; + u32 intparm; + + sch = private->sch; + + orb = cp_get_orb(&private->cp, (u32)(addr_t)sch, sch->lpm); + + /* Issue "Start Subchannel" */ + ccode = ssch(sch->schid, orb); + + switch (ccode) { + case 0: + /* + * Initialize device status information + */ + sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; + break; + case 1: /* Status pending */ + case 2: /* Busy */ + return -EBUSY; + case 3: /* Device/path not operational */ + { + lpm = orb->cmd.lpm; + if (lpm != 0) + sch->lpm &= ~lpm; + else + sch->lpm = 0; + + if (cio_update_schib(sch)) + return -ENODEV; + + return sch->lpm ? -EACCES : -ENODEV; + } + default: + return ccode; + } + + intparm = (u32)(addr_t)sch; + private->intparm = 0; + wait_event(private->wait_q, doing_io(private, intparm)); + + if (scsw_is_solicited(&private->irb.scsw)) + cp_update_scsw(&private->cp, &private->irb.scsw); + + return 0; +} + +/* Deal with the ccw command request from the userspace. */ +int vfio_ccw_sch_cmd_request(struct vfio_ccw_private *private) +{ + struct mdev_device *mdev = private->mdev; + union orb *orb; + union scsw *scsw = &private->scsw; + struct irb *irb = &private->irb; + struct ccw_io_region *io_region = &private->io_region; + int ret; + + memcpy(scsw, io_region->scsw_area, sizeof(*scsw)); + + if (scsw->cmd.fctl & SCSW_FCTL_START_FUNC) { + orb = (union orb *)io_region->orb_area; + + ret = cp_init(&private->cp, mdev_dev(mdev), orb); + if (ret) + return ret; + + ret = cp_prefetch(&private->cp); + if (ret) { + cp_free(&private->cp); + return ret; + } + + /* Start channel program and wait for I/O interrupt. */ + ret = vfio_ccw_sch_io_helper(private); + if (!ret) { + /* Get irb info and copy it to irb_area. */ + memcpy(io_region->irb_area, irb, sizeof(*irb)); + } + + cp_free(&private->cp); + } else if (scsw->cmd.fctl & SCSW_FCTL_HALT_FUNC) { + /* XXX: Handle halt. */ + ret = -EOPNOTSUPP; + } else if (scsw->cmd.fctl & SCSW_FCTL_CLEAR_FUNC) { + /* XXX: Handle clear. */ + ret = -EOPNOTSUPP; + } else { + ret = -EOPNOTSUPP; + } + + return ret; +} + /* * Sysfs interfaces */ @@ -113,12 +220,18 @@ static struct attribute_group vfio_subchannel_attr_group = { static void vfio_ccw_sch_irq(struct subchannel *sch) { struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev); + struct irb *irb; inc_irq_stat(IRQIO_CIO); if (!private) return; + irb = this_cpu_ptr(&cio_irb); + memcpy(&private->irb, irb, sizeof(*irb)); + private->intparm = (u32)(addr_t)sch; + wake_up(&private->wait_q); + if (private->completion) complete(private->completion); } @@ -156,6 +269,7 @@ static int vfio_ccw_sch_probe(struct subchannel *sch) if (ret) goto out_rm_group; + init_waitqueue_head(&private->wait_q); atomic_set(&private->avail, 1); return 0; diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c index 6c06805..878c882 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -23,12 +23,25 @@ static int vfio_ccw_mdev_notifier(struct notifier_block *nb, return NOTIFY_STOP; /* - * TODO: * Vendor drivers MUST unpin pages in response to an * invalidation. */ - if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) - return NOTIFY_BAD; + if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) { + struct vfio_iommu_type1_dma_unmap *unmap = data; + struct subchannel *sch = private->sch; + + if (!cp_iova_pinned(&private->cp, unmap->iova)) + return NOTIFY_OK; + + if (vfio_ccw_sch_quiesce(sch)) + return NOTIFY_BAD; + + if (cio_enable_subchannel(sch, (u32)(unsigned long)sch)) + return NOTIFY_BAD; + + cp_free(&private->cp); + return NOTIFY_OK; + } return NOTIFY_DONE; } @@ -167,7 +180,10 @@ static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev, region = &private->io_region; if (copy_from_user((void *)region + *ppos, buf, count)) return -EFAULT; - region->ret_code = 0; + + region->ret_code = vfio_ccw_sch_cmd_request(private); + if (region->ret_code != 0) + return region->ret_code; return count; } diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h index 359e96b..79e5337 100644 --- a/drivers/s390/cio/vfio_ccw_private.h +++ b/drivers/s390/cio/vfio_ccw_private.h @@ -10,9 +10,11 @@ #ifndef _VFIO_CCW_PRIVATE_H_ #define _VFIO_CCW_PRIVATE_H_ +#include #include #include "css.h" +#include "vfio_ccw_cp.h" /** * struct vfio_ccw_private @@ -22,6 +24,11 @@ * @mdev: pointer to the mediated device * @nb: notifier for vfio events * @io_region: MMIO region to input/output I/O arguments/results + * @wait_q: wait for interrupt + * @intparm: record current interrupt parameter, used for wait interrupt + * @cp: channel program for the current I/O operation + * @irb: irb info received from interrupt + * @scsw: scsw info */ struct vfio_ccw_private { struct subchannel *sch; @@ -30,11 +37,18 @@ struct vfio_ccw_private { struct mdev_device *mdev; struct notifier_block nb; struct ccw_io_region io_region; + + wait_queue_head_t wait_q; + u32 intparm; + struct channel_program cp; + struct irb irb; + union scsw scsw; } __aligned(8); extern int vfio_ccw_mdev_reg(struct subchannel *sch); extern void vfio_ccw_mdev_unreg(struct subchannel *sch); extern int vfio_ccw_sch_quiesce(struct subchannel *sch); +extern int vfio_ccw_sch_cmd_request(struct vfio_ccw_private *private); #endif -- 2.7.4