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Merge tag 'vfio-ccw-20200603-v2' of https://git.kernel.org/pub/scm/li…
…nux/kernel/git/kvms390/vfio-ccw into features vfio-ccw updates: - accept requests without the prefetch bit set - enable path handling via two new regions * tag 'vfio-ccw-20200603-v2' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/vfio-ccw: vfio-ccw: Add trace for CRW event vfio-ccw: Wire up the CRW irq and CRW region vfio-ccw: Introduce a new CRW region vfio-ccw: Refactor IRQ handlers vfio-ccw: Introduce a new schib region vfio-ccw: Refactor the unregister of the async regions vfio-ccw: Register a chp_event callback for vfio-ccw vfio-ccw: Introduce new helper functions to free/destroy regions vfio-ccw: document possible errors vfio-ccw: Enable transparent CCW IPL from DASD Link: https://lkml.kernel.org/r/20200603112716.332801-1-cohuck@redhat.com Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 | ||
| /* | ||
| * Channel path related status regions for vfio_ccw | ||
| * | ||
| * Copyright IBM Corp. 2020 | ||
| * | ||
| * Author(s): Farhan Ali <alifm@linux.ibm.com> | ||
| * Eric Farman <farman@linux.ibm.com> | ||
| */ | ||
|
|
||
| #include <linux/vfio.h> | ||
| #include "vfio_ccw_private.h" | ||
|
|
||
| static ssize_t vfio_ccw_schib_region_read(struct vfio_ccw_private *private, | ||
| char __user *buf, size_t count, | ||
| loff_t *ppos) | ||
| { | ||
| unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS; | ||
| loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK; | ||
| struct ccw_schib_region *region; | ||
| int ret; | ||
|
|
||
| if (pos + count > sizeof(*region)) | ||
| return -EINVAL; | ||
|
|
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| mutex_lock(&private->io_mutex); | ||
| region = private->region[i].data; | ||
|
|
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| if (cio_update_schib(private->sch)) { | ||
| ret = -ENODEV; | ||
| goto out; | ||
| } | ||
|
|
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| memcpy(region, &private->sch->schib, sizeof(*region)); | ||
|
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| if (copy_to_user(buf, (void *)region + pos, count)) { | ||
| ret = -EFAULT; | ||
| goto out; | ||
| } | ||
|
|
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| ret = count; | ||
|
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| out: | ||
| mutex_unlock(&private->io_mutex); | ||
| return ret; | ||
| } | ||
|
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| static ssize_t vfio_ccw_schib_region_write(struct vfio_ccw_private *private, | ||
| const char __user *buf, size_t count, | ||
| loff_t *ppos) | ||
| { | ||
| return -EINVAL; | ||
| } | ||
|
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|
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| static void vfio_ccw_schib_region_release(struct vfio_ccw_private *private, | ||
| struct vfio_ccw_region *region) | ||
| { | ||
|
|
||
| } | ||
|
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| const struct vfio_ccw_regops vfio_ccw_schib_region_ops = { | ||
| .read = vfio_ccw_schib_region_read, | ||
| .write = vfio_ccw_schib_region_write, | ||
| .release = vfio_ccw_schib_region_release, | ||
| }; | ||
|
|
||
| int vfio_ccw_register_schib_dev_regions(struct vfio_ccw_private *private) | ||
| { | ||
| return vfio_ccw_register_dev_region(private, | ||
| VFIO_REGION_SUBTYPE_CCW_SCHIB, | ||
| &vfio_ccw_schib_region_ops, | ||
| sizeof(struct ccw_schib_region), | ||
| VFIO_REGION_INFO_FLAG_READ, | ||
| private->schib_region); | ||
| } | ||
|
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| static ssize_t vfio_ccw_crw_region_read(struct vfio_ccw_private *private, | ||
| char __user *buf, size_t count, | ||
| loff_t *ppos) | ||
| { | ||
| unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS; | ||
| loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK; | ||
| struct ccw_crw_region *region; | ||
| struct vfio_ccw_crw *crw; | ||
| int ret; | ||
|
|
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| if (pos + count > sizeof(*region)) | ||
| return -EINVAL; | ||
|
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| crw = list_first_entry_or_null(&private->crw, | ||
| struct vfio_ccw_crw, next); | ||
|
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| if (crw) | ||
| list_del(&crw->next); | ||
|
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| mutex_lock(&private->io_mutex); | ||
| region = private->region[i].data; | ||
|
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| if (crw) | ||
| memcpy(®ion->crw, &crw->crw, sizeof(region->crw)); | ||
|
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| if (copy_to_user(buf, (void *)region + pos, count)) | ||
| ret = -EFAULT; | ||
| else | ||
| ret = count; | ||
|
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| region->crw = 0; | ||
|
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| mutex_unlock(&private->io_mutex); | ||
|
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| kfree(crw); | ||
|
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| /* Notify the guest if more CRWs are on our queue */ | ||
| if (!list_empty(&private->crw) && private->crw_trigger) | ||
| eventfd_signal(private->crw_trigger, 1); | ||
|
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| return ret; | ||
| } | ||
|
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| static ssize_t vfio_ccw_crw_region_write(struct vfio_ccw_private *private, | ||
| const char __user *buf, size_t count, | ||
| loff_t *ppos) | ||
| { | ||
| return -EINVAL; | ||
| } | ||
|
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| static void vfio_ccw_crw_region_release(struct vfio_ccw_private *private, | ||
| struct vfio_ccw_region *region) | ||
| { | ||
|
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| } | ||
|
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| const struct vfio_ccw_regops vfio_ccw_crw_region_ops = { | ||
| .read = vfio_ccw_crw_region_read, | ||
| .write = vfio_ccw_crw_region_write, | ||
| .release = vfio_ccw_crw_region_release, | ||
| }; | ||
|
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| int vfio_ccw_register_crw_dev_regions(struct vfio_ccw_private *private) | ||
| { | ||
| return vfio_ccw_register_dev_region(private, | ||
| VFIO_REGION_SUBTYPE_CCW_CRW, | ||
| &vfio_ccw_crw_region_ops, | ||
| sizeof(struct ccw_crw_region), | ||
| VFIO_REGION_INFO_FLAG_READ, | ||
| private->crw_region); | ||
| } |
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