From d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 02:45:28 +0000
Subject: [PATCH] add boot partition size
---
kernel/drivers/s390/cio/vfio_ccw_drv.c | 293 ++++++++++++++++++++++++++++++++++++++++++++++++++++------
1 files changed, 261 insertions(+), 32 deletions(-)
diff --git a/kernel/drivers/s390/cio/vfio_ccw_drv.c b/kernel/drivers/s390/cio/vfio_ccw_drv.c
index 7a06cdf..e3c1060 100644
--- a/kernel/drivers/s390/cio/vfio_ccw_drv.c
+++ b/kernel/drivers/s390/cio/vfio_ccw_drv.c
@@ -3,9 +3,11 @@
* VFIO based Physical Subchannel device driver
*
* Copyright IBM Corp. 2017
+ * Copyright Red Hat, Inc. 2019
*
* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
* Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
+ * Cornelia Huck <cohuck@redhat.com>
*/
#include <linux/module.h>
@@ -17,12 +19,19 @@
#include <asm/isc.h>
+#include "chp.h"
#include "ioasm.h"
#include "css.h"
#include "vfio_ccw_private.h"
struct workqueue_struct *vfio_ccw_work_q;
-struct kmem_cache *vfio_ccw_io_region;
+static struct kmem_cache *vfio_ccw_io_region;
+static struct kmem_cache *vfio_ccw_cmd_region;
+static struct kmem_cache *vfio_ccw_schib_region;
+static struct kmem_cache *vfio_ccw_crw_region;
+
+debug_info_t *vfio_ccw_debug_msg_id;
+debug_info_t *vfio_ccw_debug_trace_id;
/*
* Helpers
@@ -77,6 +86,7 @@
struct vfio_ccw_private *private;
struct irb *irb;
bool is_final;
+ bool cp_is_finished = false;
private = container_of(work, struct vfio_ccw_private, io_work);
irb = &private->irb;
@@ -85,16 +95,35 @@
(SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT));
if (scsw_is_solicited(&irb->scsw)) {
cp_update_scsw(&private->cp, &irb->scsw);
- if (is_final)
+ if (is_final && private->state == VFIO_CCW_STATE_CP_PENDING) {
cp_free(&private->cp);
+ cp_is_finished = true;
+ }
}
+ mutex_lock(&private->io_mutex);
memcpy(private->io_region->irb_area, irb, sizeof(*irb));
+ mutex_unlock(&private->io_mutex);
+
+ /*
+ * Reset to IDLE only if processing of a channel program
+ * has finished. Do not overwrite a possible processing
+ * state if the final interrupt was for HSCH or CSCH.
+ */
+ if (private->mdev && cp_is_finished)
+ private->state = VFIO_CCW_STATE_IDLE;
if (private->io_trigger)
eventfd_signal(private->io_trigger, 1);
+}
- if (private->mdev && is_final)
- private->state = VFIO_CCW_STATE_IDLE;
+static void vfio_ccw_crw_todo(struct work_struct *work)
+{
+ struct vfio_ccw_private *private;
+
+ private = container_of(work, struct vfio_ccw_private, crw_work);
+
+ if (!list_empty(&private->crw) && private->crw_trigger)
+ eventfd_signal(private->crw_trigger, 1);
}
/*
@@ -108,11 +137,23 @@
vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_INTERRUPT);
}
+static void vfio_ccw_free_regions(struct vfio_ccw_private *private)
+{
+ if (private->crw_region)
+ kmem_cache_free(vfio_ccw_crw_region, private->crw_region);
+ if (private->schib_region)
+ kmem_cache_free(vfio_ccw_schib_region, private->schib_region);
+ if (private->cmd_region)
+ kmem_cache_free(vfio_ccw_cmd_region, private->cmd_region);
+ if (private->io_region)
+ kmem_cache_free(vfio_ccw_io_region, private->io_region);
+}
+
static int vfio_ccw_sch_probe(struct subchannel *sch)
{
struct pmcw *pmcw = &sch->schib.pmcw;
struct vfio_ccw_private *private;
- int ret;
+ int ret = -ENOMEM;
if (pmcw->qf) {
dev_warn(&sch->dev, "vfio: ccw: does not support QDIO: %s\n",
@@ -124,15 +165,36 @@
if (!private)
return -ENOMEM;
+ private->cp.guest_cp = kcalloc(CCWCHAIN_LEN_MAX, sizeof(struct ccw1),
+ GFP_KERNEL);
+ if (!private->cp.guest_cp)
+ goto out_free;
+
private->io_region = kmem_cache_zalloc(vfio_ccw_io_region,
GFP_KERNEL | GFP_DMA);
- if (!private->io_region) {
- kfree(private);
- return -ENOMEM;
- }
+ if (!private->io_region)
+ goto out_free;
+
+ private->cmd_region = kmem_cache_zalloc(vfio_ccw_cmd_region,
+ GFP_KERNEL | GFP_DMA);
+ if (!private->cmd_region)
+ goto out_free;
+
+ private->schib_region = kmem_cache_zalloc(vfio_ccw_schib_region,
+ GFP_KERNEL | GFP_DMA);
+
+ if (!private->schib_region)
+ goto out_free;
+
+ private->crw_region = kmem_cache_zalloc(vfio_ccw_crw_region,
+ GFP_KERNEL | GFP_DMA);
+
+ if (!private->crw_region)
+ goto out_free;
private->sch = sch;
dev_set_drvdata(&sch->dev, private);
+ mutex_init(&private->io_mutex);
spin_lock_irq(sch->lock);
private->state = VFIO_CCW_STATE_NOT_OPER;
@@ -142,21 +204,32 @@
if (ret)
goto out_free;
+ INIT_LIST_HEAD(&private->crw);
+ INIT_WORK(&private->io_work, vfio_ccw_sch_io_todo);
+ INIT_WORK(&private->crw_work, vfio_ccw_crw_todo);
+ atomic_set(&private->avail, 1);
+ private->state = VFIO_CCW_STATE_STANDBY;
+
ret = vfio_ccw_mdev_reg(sch);
if (ret)
goto out_disable;
- INIT_WORK(&private->io_work, vfio_ccw_sch_io_todo);
- atomic_set(&private->avail, 1);
- private->state = VFIO_CCW_STATE_STANDBY;
+ if (dev_get_uevent_suppress(&sch->dev)) {
+ dev_set_uevent_suppress(&sch->dev, 0);
+ kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
+ }
+ VFIO_CCW_MSG_EVENT(4, "bound to subchannel %x.%x.%04x\n",
+ sch->schid.cssid, sch->schid.ssid,
+ sch->schid.sch_no);
return 0;
out_disable:
cio_disable_subchannel(sch);
out_free:
dev_set_drvdata(&sch->dev, NULL);
- kmem_cache_free(vfio_ccw_io_region, private->io_region);
+ vfio_ccw_free_regions(private);
+ kfree(private->cp.guest_cp);
kfree(private);
return ret;
}
@@ -164,16 +237,26 @@
static int vfio_ccw_sch_remove(struct subchannel *sch)
{
struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
+ struct vfio_ccw_crw *crw, *temp;
vfio_ccw_sch_quiesce(sch);
+
+ list_for_each_entry_safe(crw, temp, &private->crw, next) {
+ list_del(&crw->next);
+ kfree(crw);
+ }
vfio_ccw_mdev_unreg(sch);
dev_set_drvdata(&sch->dev, NULL);
- kmem_cache_free(vfio_ccw_io_region, private->io_region);
+ vfio_ccw_free_regions(private);
+ kfree(private->cp.guest_cp);
kfree(private);
+ VFIO_CCW_MSG_EVENT(4, "unbound from subchannel %x.%x.%04x\n",
+ sch->schid.cssid, sch->schid.ssid,
+ sch->schid.sch_no);
return 0;
}
@@ -205,23 +288,92 @@
if (work_pending(&sch->todo_work))
goto out_unlock;
- if (cio_update_schib(sch)) {
- vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
- rc = 0;
- goto out_unlock;
- }
-
- private = dev_get_drvdata(&sch->dev);
- if (private->state == VFIO_CCW_STATE_NOT_OPER) {
- private->state = private->mdev ? VFIO_CCW_STATE_IDLE :
- VFIO_CCW_STATE_STANDBY;
- }
rc = 0;
+
+ if (cio_update_schib(sch))
+ vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
out_unlock:
spin_unlock_irqrestore(sch->lock, flags);
return rc;
+}
+
+static void vfio_ccw_queue_crw(struct vfio_ccw_private *private,
+ unsigned int rsc,
+ unsigned int erc,
+ unsigned int rsid)
+{
+ struct vfio_ccw_crw *crw;
+
+ /*
+ * If unable to allocate a CRW, just drop the event and
+ * carry on. The guest will either see a later one or
+ * learn when it issues its own store subchannel.
+ */
+ crw = kzalloc(sizeof(*crw), GFP_ATOMIC);
+ if (!crw)
+ return;
+
+ /*
+ * Build the CRW based on the inputs given to us.
+ */
+ crw->crw.rsc = rsc;
+ crw->crw.erc = erc;
+ crw->crw.rsid = rsid;
+
+ list_add_tail(&crw->next, &private->crw);
+ queue_work(vfio_ccw_work_q, &private->crw_work);
+}
+
+static int vfio_ccw_chp_event(struct subchannel *sch,
+ struct chp_link *link, int event)
+{
+ struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
+ int mask = chp_ssd_get_mask(&sch->ssd_info, link);
+ int retry = 255;
+
+ if (!private || !mask)
+ return 0;
+
+ trace_vfio_ccw_chp_event(private->sch->schid, mask, event);
+ VFIO_CCW_MSG_EVENT(2, "%pUl (%x.%x.%04x): mask=0x%x event=%d\n",
+ mdev_uuid(private->mdev), sch->schid.cssid,
+ sch->schid.ssid, sch->schid.sch_no,
+ mask, event);
+
+ if (cio_update_schib(sch))
+ return -ENODEV;
+
+ switch (event) {
+ case CHP_VARY_OFF:
+ /* Path logically turned off */
+ sch->opm &= ~mask;
+ sch->lpm &= ~mask;
+ if (sch->schib.pmcw.lpum & mask)
+ cio_cancel_halt_clear(sch, &retry);
+ break;
+ case CHP_OFFLINE:
+ /* Path is gone */
+ if (sch->schib.pmcw.lpum & mask)
+ cio_cancel_halt_clear(sch, &retry);
+ vfio_ccw_queue_crw(private, CRW_RSC_CPATH, CRW_ERC_PERRN,
+ link->chpid.id);
+ break;
+ case CHP_VARY_ON:
+ /* Path logically turned on */
+ sch->opm |= mask;
+ sch->lpm |= mask;
+ break;
+ case CHP_ONLINE:
+ /* Path became available */
+ sch->lpm |= mask & sch->opm;
+ vfio_ccw_queue_crw(private, CRW_RSC_CPATH, CRW_ERC_INIT,
+ link->chpid.id);
+ break;
+ }
+
+ return 0;
}
static struct css_device_id vfio_ccw_sch_ids[] = {
@@ -241,33 +393,109 @@
.remove = vfio_ccw_sch_remove,
.shutdown = vfio_ccw_sch_shutdown,
.sch_event = vfio_ccw_sch_event,
+ .chp_event = vfio_ccw_chp_event,
};
+
+static int __init vfio_ccw_debug_init(void)
+{
+ vfio_ccw_debug_msg_id = debug_register("vfio_ccw_msg", 16, 1,
+ 11 * sizeof(long));
+ if (!vfio_ccw_debug_msg_id)
+ goto out_unregister;
+ debug_register_view(vfio_ccw_debug_msg_id, &debug_sprintf_view);
+ debug_set_level(vfio_ccw_debug_msg_id, 2);
+ vfio_ccw_debug_trace_id = debug_register("vfio_ccw_trace", 16, 1, 16);
+ if (!vfio_ccw_debug_trace_id)
+ goto out_unregister;
+ debug_register_view(vfio_ccw_debug_trace_id, &debug_hex_ascii_view);
+ debug_set_level(vfio_ccw_debug_trace_id, 2);
+ return 0;
+
+out_unregister:
+ debug_unregister(vfio_ccw_debug_msg_id);
+ debug_unregister(vfio_ccw_debug_trace_id);
+ return -1;
+}
+
+static void vfio_ccw_debug_exit(void)
+{
+ debug_unregister(vfio_ccw_debug_msg_id);
+ debug_unregister(vfio_ccw_debug_trace_id);
+}
+
+static void vfio_ccw_destroy_regions(void)
+{
+ kmem_cache_destroy(vfio_ccw_crw_region);
+ kmem_cache_destroy(vfio_ccw_schib_region);
+ kmem_cache_destroy(vfio_ccw_cmd_region);
+ kmem_cache_destroy(vfio_ccw_io_region);
+}
static int __init vfio_ccw_sch_init(void)
{
int ret;
+ ret = vfio_ccw_debug_init();
+ if (ret)
+ return ret;
+
vfio_ccw_work_q = create_singlethread_workqueue("vfio-ccw");
- if (!vfio_ccw_work_q)
- return -ENOMEM;
+ if (!vfio_ccw_work_q) {
+ ret = -ENOMEM;
+ goto out_err;
+ }
vfio_ccw_io_region = kmem_cache_create_usercopy("vfio_ccw_io_region",
sizeof(struct ccw_io_region), 0,
SLAB_ACCOUNT, 0,
sizeof(struct ccw_io_region), NULL);
if (!vfio_ccw_io_region) {
- destroy_workqueue(vfio_ccw_work_q);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ vfio_ccw_cmd_region = kmem_cache_create_usercopy("vfio_ccw_cmd_region",
+ sizeof(struct ccw_cmd_region), 0,
+ SLAB_ACCOUNT, 0,
+ sizeof(struct ccw_cmd_region), NULL);
+ if (!vfio_ccw_cmd_region) {
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ vfio_ccw_schib_region = kmem_cache_create_usercopy("vfio_ccw_schib_region",
+ sizeof(struct ccw_schib_region), 0,
+ SLAB_ACCOUNT, 0,
+ sizeof(struct ccw_schib_region), NULL);
+
+ if (!vfio_ccw_schib_region) {
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ vfio_ccw_crw_region = kmem_cache_create_usercopy("vfio_ccw_crw_region",
+ sizeof(struct ccw_crw_region), 0,
+ SLAB_ACCOUNT, 0,
+ sizeof(struct ccw_crw_region), NULL);
+
+ if (!vfio_ccw_crw_region) {
+ ret = -ENOMEM;
+ goto out_err;
}
isc_register(VFIO_CCW_ISC);
ret = css_driver_register(&vfio_ccw_sch_driver);
if (ret) {
isc_unregister(VFIO_CCW_ISC);
- kmem_cache_destroy(vfio_ccw_io_region);
- destroy_workqueue(vfio_ccw_work_q);
+ goto out_err;
}
+ return ret;
+
+out_err:
+ vfio_ccw_destroy_regions();
+ destroy_workqueue(vfio_ccw_work_q);
+ vfio_ccw_debug_exit();
return ret;
}
@@ -275,8 +503,9 @@
{
css_driver_unregister(&vfio_ccw_sch_driver);
isc_unregister(VFIO_CCW_ISC);
- kmem_cache_destroy(vfio_ccw_io_region);
+ vfio_ccw_destroy_regions();
destroy_workqueue(vfio_ccw_work_q);
+ vfio_ccw_debug_exit();
}
module_init(vfio_ccw_sch_init);
module_exit(vfio_ccw_sch_exit);
--
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