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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 <pmorel@linux.vnet.ibm.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20170317031743.40128-9-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
zero-colors
Dong Jia Shi 2017-03-17 04:17:35 +01:00 committed by Cornelia Huck
parent 060d2b5afc
commit 4e149e431a
3 changed files with 148 additions and 4 deletions
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114
drivers/s390/cio/vfio_ccw_drv.c
View File

@ -11,9 +11,13 @@
#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/uuid.h>
#include <linux/mdev.h>
#include <asm/isc.h>
#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;

24
drivers/s390/cio/vfio_ccw_ops.c
View File

@ -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;
}

14
drivers/s390/cio/vfio_ccw_private.h
View File

@ -10,9 +10,11 @@
#ifndef _VFIO_CCW_PRIVATE_H_
#define _VFIO_CCW_PRIVATE_H_
#include <linux/completion.h>
#include <linux/vfio_ccw.h>
#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