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-rw-r--r--drivers/xen/balloon.c62
-rw-r--r--drivers/xen/events.c87
-rw-r--r--drivers/xen/gntdev.c39
-rw-r--r--drivers/xen/grant-table.c6
-rw-r--r--drivers/xen/pci.c105
-rw-r--r--drivers/xen/swiotlb-xen.c70
-rw-r--r--drivers/xen/xen-selfballoon.c67
-rw-r--r--drivers/xen/xenbus/xenbus_comms.c4
-rw-r--r--drivers/xen/xenbus/xenbus_probe.c101
-rw-r--r--drivers/xen/xenbus/xenbus_probe_backend.c2
-rw-r--r--drivers/xen/xenbus/xenbus_probe_frontend.c121
-rw-r--r--drivers/xen/xenbus/xenbus_xs.c17
12 files changed, 533 insertions, 148 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 5dfd8f8ff07f..5876e1ae6c2d 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -501,20 +501,24 @@ EXPORT_SYMBOL_GPL(balloon_set_new_target);
* alloc_xenballooned_pages - get pages that have been ballooned out
* @nr_pages: Number of pages to get
* @pages: pages returned
+ * @highmem: highmem or lowmem pages
* @return 0 on success, error otherwise
*/
-int alloc_xenballooned_pages(int nr_pages, struct page** pages)
+int alloc_xenballooned_pages(int nr_pages, struct page **pages, bool highmem)
{
int pgno = 0;
struct page* page;
mutex_lock(&balloon_mutex);
while (pgno < nr_pages) {
- page = balloon_retrieve(true);
- if (page) {
+ page = balloon_retrieve(highmem);
+ if (page && PageHighMem(page) == highmem) {
pages[pgno++] = page;
} else {
enum bp_state st;
- st = decrease_reservation(nr_pages - pgno, GFP_HIGHUSER);
+ if (page)
+ balloon_append(page);
+ st = decrease_reservation(nr_pages - pgno,
+ highmem ? GFP_HIGHUSER : GFP_USER);
if (st != BP_DONE)
goto out_undo;
}
@@ -555,17 +559,40 @@ void free_xenballooned_pages(int nr_pages, struct page** pages)
}
EXPORT_SYMBOL(free_xenballooned_pages);
-static int __init balloon_init(void)
+static void __init balloon_add_region(unsigned long start_pfn,
+ unsigned long pages)
{
unsigned long pfn, extra_pfn_end;
struct page *page;
+ /*
+ * If the amount of usable memory has been limited (e.g., with
+ * the 'mem' command line parameter), don't add pages beyond
+ * this limit.
+ */
+ extra_pfn_end = min(max_pfn, start_pfn + pages);
+
+ for (pfn = start_pfn; pfn < extra_pfn_end; pfn++) {
+ page = pfn_to_page(pfn);
+ /* totalram_pages and totalhigh_pages do not
+ include the boot-time balloon extension, so
+ don't subtract from it. */
+ __balloon_append(page);
+ }
+}
+
+static int __init balloon_init(void)
+{
+ int i;
+
if (!xen_domain())
return -ENODEV;
pr_info("xen/balloon: Initialising balloon driver.\n");
- balloon_stats.current_pages = xen_pv_domain() ? min(xen_start_info->nr_pages, max_pfn) : max_pfn;
+ balloon_stats.current_pages = xen_pv_domain()
+ ? min(xen_start_info->nr_pages - xen_released_pages, max_pfn)
+ : max_pfn;
balloon_stats.target_pages = balloon_stats.current_pages;
balloon_stats.balloon_low = 0;
balloon_stats.balloon_high = 0;
@@ -584,24 +611,13 @@ static int __init balloon_init(void)
#endif
/*
- * Initialise the balloon with excess memory space. We need
- * to make sure we don't add memory which doesn't exist or
- * logically exist. The E820 map can be trimmed to be smaller
- * than the amount of physical memory due to the mem= command
- * line parameter. And if this is a 32-bit non-HIGHMEM kernel
- * on a system with memory which requires highmem to access,
- * don't try to use it.
+ * Initialize the balloon with pages from the extra memory
+ * regions (see arch/x86/xen/setup.c).
*/
- extra_pfn_end = min(min(max_pfn, e820_end_of_ram_pfn()),
- (unsigned long)PFN_DOWN(xen_extra_mem_start + xen_extra_mem_size));
- for (pfn = PFN_UP(xen_extra_mem_start);
- pfn < extra_pfn_end;
- pfn++) {
- page = pfn_to_page(pfn);
- /* totalram_pages and totalhigh_pages do not include the boot-time
- balloon extension, so don't subtract from it. */
- __balloon_append(page);
- }
+ for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)
+ if (xen_extra_mem[i].size)
+ balloon_add_region(PFN_UP(xen_extra_mem[i].start),
+ PFN_DOWN(xen_extra_mem[i].size));
return 0;
}
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index da70f5c32eb9..7a55b292bf39 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -54,7 +54,7 @@
* This lock protects updates to the following mapping and reference-count
* arrays. The lock does not need to be acquired to read the mapping tables.
*/
-static DEFINE_SPINLOCK(irq_mapping_update_lock);
+static DEFINE_MUTEX(irq_mapping_update_lock);
static LIST_HEAD(xen_irq_list_head);
@@ -432,7 +432,8 @@ static int __must_check xen_allocate_irq_dynamic(void)
irq = irq_alloc_desc_from(first, -1);
- xen_irq_init(irq);
+ if (irq >= 0)
+ xen_irq_init(irq);
return irq;
}
@@ -631,7 +632,7 @@ int xen_bind_pirq_gsi_to_irq(unsigned gsi,
int irq = -1;
struct physdev_irq irq_op;
- spin_lock(&irq_mapping_update_lock);
+ mutex_lock(&irq_mapping_update_lock);
irq = find_irq_by_gsi(gsi);
if (irq != -1) {
@@ -684,7 +685,7 @@ int xen_bind_pirq_gsi_to_irq(unsigned gsi,
handle_edge_irq, name);
out:
- spin_unlock(&irq_mapping_update_lock);
+ mutex_unlock(&irq_mapping_update_lock);
return irq;
}
@@ -710,10 +711,10 @@ int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
{
int irq, ret;
- spin_lock(&irq_mapping_update_lock);
+ mutex_lock(&irq_mapping_update_lock);
irq = xen_allocate_irq_dynamic();
- if (irq == -1)
+ if (irq < 0)
goto out;
irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq,
@@ -724,12 +725,12 @@ int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
if (ret < 0)
goto error_irq;
out:
- spin_unlock(&irq_mapping_update_lock);
+ mutex_unlock(&irq_mapping_update_lock);
return irq;
error_irq:
- spin_unlock(&irq_mapping_update_lock);
+ mutex_unlock(&irq_mapping_update_lock);
xen_free_irq(irq);
- return -1;
+ return ret;
}
#endif
@@ -740,7 +741,7 @@ int xen_destroy_irq(int irq)
struct irq_info *info = info_for_irq(irq);
int rc = -ENOENT;
- spin_lock(&irq_mapping_update_lock);
+ mutex_lock(&irq_mapping_update_lock);
desc = irq_to_desc(irq);
if (!desc)
@@ -766,7 +767,7 @@ int xen_destroy_irq(int irq)
xen_free_irq(irq);
out:
- spin_unlock(&irq_mapping_update_lock);
+ mutex_unlock(&irq_mapping_update_lock);
return rc;
}
@@ -776,10 +777,10 @@ int xen_irq_from_pirq(unsigned pirq)
struct irq_info *info;
- spin_lock(&irq_mapping_update_lock);
+ mutex_lock(&irq_mapping_update_lock);
list_for_each_entry(info, &xen_irq_list_head, list) {
- if (info == NULL || info->type != IRQT_PIRQ)
+ if (info->type != IRQT_PIRQ)
continue;
irq = info->irq;
if (info->u.pirq.pirq == pirq)
@@ -787,7 +788,7 @@ int xen_irq_from_pirq(unsigned pirq)
}
irq = -1;
out:
- spin_unlock(&irq_mapping_update_lock);
+ mutex_unlock(&irq_mapping_update_lock);
return irq;
}
@@ -802,7 +803,7 @@ int bind_evtchn_to_irq(unsigned int evtchn)
{
int irq;
- spin_lock(&irq_mapping_update_lock);
+ mutex_lock(&irq_mapping_update_lock);
irq = evtchn_to_irq[evtchn];
@@ -818,7 +819,7 @@ int bind_evtchn_to_irq(unsigned int evtchn)
}
out:
- spin_unlock(&irq_mapping_update_lock);
+ mutex_unlock(&irq_mapping_update_lock);
return irq;
}
@@ -829,7 +830,7 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
struct evtchn_bind_ipi bind_ipi;
int evtchn, irq;
- spin_lock(&irq_mapping_update_lock);
+ mutex_lock(&irq_mapping_update_lock);
irq = per_cpu(ipi_to_irq, cpu)[ipi];
@@ -853,7 +854,7 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
}
out:
- spin_unlock(&irq_mapping_update_lock);
+ mutex_unlock(&irq_mapping_update_lock);
return irq;
}
@@ -872,13 +873,34 @@ static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
return err ? : bind_evtchn_to_irq(bind_interdomain.local_port);
}
+static int find_virq(unsigned int virq, unsigned int cpu)
+{
+ struct evtchn_status status;
+ int port, rc = -ENOENT;
+
+ memset(&status, 0, sizeof(status));
+ for (port = 0; port <= NR_EVENT_CHANNELS; port++) {
+ status.dom = DOMID_SELF;
+ status.port = port;
+ rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status);
+ if (rc < 0)
+ continue;
+ if (status.status != EVTCHNSTAT_virq)
+ continue;
+ if (status.u.virq == virq && status.vcpu == cpu) {
+ rc = port;
+ break;
+ }
+ }
+ return rc;
+}
int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
{
struct evtchn_bind_virq bind_virq;
- int evtchn, irq;
+ int evtchn, irq, ret;
- spin_lock(&irq_mapping_update_lock);
+ mutex_lock(&irq_mapping_update_lock);
irq = per_cpu(virq_to_irq, cpu)[virq];
@@ -892,10 +914,16 @@ int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
bind_virq.virq = virq;
bind_virq.vcpu = cpu;
- if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
- &bind_virq) != 0)
- BUG();
- evtchn = bind_virq.port;
+ ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
+ &bind_virq);
+ if (ret == 0)
+ evtchn = bind_virq.port;
+ else {
+ if (ret == -EEXIST)
+ ret = find_virq(virq, cpu);
+ BUG_ON(ret < 0);
+ evtchn = ret;
+ }
xen_irq_info_virq_init(cpu, irq, evtchn, virq);
@@ -903,7 +931,7 @@ int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
}
out:
- spin_unlock(&irq_mapping_update_lock);
+ mutex_unlock(&irq_mapping_update_lock);
return irq;
}
@@ -913,7 +941,7 @@ static void unbind_from_irq(unsigned int irq)
struct evtchn_close close;
int evtchn = evtchn_from_irq(irq);
- spin_lock(&irq_mapping_update_lock);
+ mutex_lock(&irq_mapping_update_lock);
if (VALID_EVTCHN(evtchn)) {
close.port = evtchn;
@@ -943,7 +971,7 @@ static void unbind_from_irq(unsigned int irq)
xen_free_irq(irq);
- spin_unlock(&irq_mapping_update_lock);
+ mutex_unlock(&irq_mapping_update_lock);
}
int bind_evtchn_to_irqhandler(unsigned int evtchn,
@@ -1279,7 +1307,7 @@ void rebind_evtchn_irq(int evtchn, int irq)
will also be masked. */
disable_irq(irq);
- spin_lock(&irq_mapping_update_lock);
+ mutex_lock(&irq_mapping_update_lock);
/* After resume the irq<->evtchn mappings are all cleared out */
BUG_ON(evtchn_to_irq[evtchn] != -1);
@@ -1289,7 +1317,7 @@ void rebind_evtchn_irq(int evtchn, int irq)
xen_irq_info_evtchn_init(irq, evtchn);
- spin_unlock(&irq_mapping_update_lock);
+ mutex_unlock(&irq_mapping_update_lock);
/* new event channels are always bound to cpu 0 */
irq_set_affinity(irq, cpumask_of(0));
@@ -1670,6 +1698,7 @@ void __init xen_init_IRQ(void)
evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
GFP_KERNEL);
+ BUG_ON(!evtchn_to_irq);
for (i = 0; i < NR_EVENT_CHANNELS; i++)
evtchn_to_irq[i] = -1;
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index f914b26cf0c2..880798aae2f2 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -83,6 +83,7 @@ struct grant_map {
struct ioctl_gntdev_grant_ref *grants;
struct gnttab_map_grant_ref *map_ops;
struct gnttab_unmap_grant_ref *unmap_ops;
+ struct gnttab_map_grant_ref *kmap_ops;
struct page **pages;
};
@@ -116,19 +117,22 @@ static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count)
add->grants = kzalloc(sizeof(add->grants[0]) * count, GFP_KERNEL);
add->map_ops = kzalloc(sizeof(add->map_ops[0]) * count, GFP_KERNEL);
add->unmap_ops = kzalloc(sizeof(add->unmap_ops[0]) * count, GFP_KERNEL);
+ add->kmap_ops = kzalloc(sizeof(add->kmap_ops[0]) * count, GFP_KERNEL);
add->pages = kzalloc(sizeof(add->pages[0]) * count, GFP_KERNEL);
if (NULL == add->grants ||
NULL == add->map_ops ||
NULL == add->unmap_ops ||
+ NULL == add->kmap_ops ||
NULL == add->pages)
goto err;
- if (alloc_xenballooned_pages(count, add->pages))
+ if (alloc_xenballooned_pages(count, add->pages, false /* lowmem */))
goto err;
for (i = 0; i < count; i++) {
add->map_ops[i].handle = -1;
add->unmap_ops[i].handle = -1;
+ add->kmap_ops[i].handle = -1;
}
add->index = 0;
@@ -142,6 +146,7 @@ err:
kfree(add->grants);
kfree(add->map_ops);
kfree(add->unmap_ops);
+ kfree(add->kmap_ops);
kfree(add);
return NULL;
}
@@ -243,10 +248,35 @@ static int map_grant_pages(struct grant_map *map)
gnttab_set_unmap_op(&map->unmap_ops[i], addr,
map->flags, -1 /* handle */);
}
+ } else {
+ /*
+ * Setup the map_ops corresponding to the pte entries pointing
+ * to the kernel linear addresses of the struct pages.
+ * These ptes are completely different from the user ptes dealt
+ * with find_grant_ptes.
+ */
+ for (i = 0; i < map->count; i++) {
+ unsigned level;
+ unsigned long address = (unsigned long)
+ pfn_to_kaddr(page_to_pfn(map->pages[i]));
+ pte_t *ptep;
+ u64 pte_maddr = 0;
+ BUG_ON(PageHighMem(map->pages[i]));
+
+ ptep = lookup_address(address, &level);
+ pte_maddr = arbitrary_virt_to_machine(ptep).maddr;
+ gnttab_set_map_op(&map->kmap_ops[i], pte_maddr,
+ map->flags |
+ GNTMAP_host_map |
+ GNTMAP_contains_pte,
+ map->grants[i].ref,
+ map->grants[i].domid);
+ }
}
pr_debug("map %d+%d\n", map->index, map->count);
- err = gnttab_map_refs(map->map_ops, map->pages, map->count);
+ err = gnttab_map_refs(map->map_ops, use_ptemod ? map->kmap_ops : NULL,
+ map->pages, map->count);
if (err)
return err;
@@ -462,13 +492,11 @@ static int gntdev_release(struct inode *inode, struct file *flip)
pr_debug("priv %p\n", priv);
- spin_lock(&priv->lock);
while (!list_empty(&priv->maps)) {
map = list_entry(priv->maps.next, struct grant_map, next);
list_del(&map->next);
gntdev_put_map(map);
}
- spin_unlock(&priv->lock);
if (use_ptemod)
mmu_notifier_unregister(&priv->mn, priv->mm);
@@ -532,10 +560,11 @@ static long gntdev_ioctl_unmap_grant_ref(struct gntdev_priv *priv,
map = gntdev_find_map_index(priv, op.index >> PAGE_SHIFT, op.count);
if (map) {
list_del(&map->next);
- gntdev_put_map(map);
err = 0;
}
spin_unlock(&priv->lock);
+ if (map)
+ gntdev_put_map(map);
return err;
}
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 4f44b347b24a..8c71ab801756 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -448,7 +448,8 @@ unsigned int gnttab_max_grant_frames(void)
EXPORT_SYMBOL_GPL(gnttab_max_grant_frames);
int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
- struct page **pages, unsigned int count)
+ struct gnttab_map_grant_ref *kmap_ops,
+ struct page **pages, unsigned int count)
{
int i, ret;
pte_t *pte;
@@ -488,8 +489,7 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
*/
return -EOPNOTSUPP;
}
- ret = m2p_add_override(mfn, pages[i],
- map_ops[i].flags & GNTMAP_contains_pte);
+ ret = m2p_add_override(mfn, pages[i], &kmap_ops[i]);
if (ret)
return ret;
}
diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index cef4bafc07dc..66057075d6e2 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -18,6 +18,7 @@
*/
#include <linux/pci.h>
+#include <linux/acpi.h>
#include <xen/xen.h>
#include <xen/interface/physdev.h>
#include <xen/interface/xen.h>
@@ -26,26 +27,85 @@
#include <asm/xen/hypercall.h>
#include "../pci/pci.h"
+static bool __read_mostly pci_seg_supported = true;
+
static int xen_add_device(struct device *dev)
{
int r;
struct pci_dev *pci_dev = to_pci_dev(dev);
+#ifdef CONFIG_PCI_IOV
+ struct pci_dev *physfn = pci_dev->physfn;
+#endif
+
+ if (pci_seg_supported) {
+ struct physdev_pci_device_add add = {
+ .seg = pci_domain_nr(pci_dev->bus),
+ .bus = pci_dev->bus->number,
+ .devfn = pci_dev->devfn
+ };
+#ifdef CONFIG_ACPI
+ acpi_handle handle;
+#endif
+
+#ifdef CONFIG_PCI_IOV
+ if (pci_dev->is_virtfn) {
+ add.flags = XEN_PCI_DEV_VIRTFN;
+ add.physfn.bus = physfn->bus->number;
+ add.physfn.devfn = physfn->devfn;
+ } else
+#endif
+ if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn))
+ add.flags = XEN_PCI_DEV_EXTFN;
+
+#ifdef CONFIG_ACPI
+ handle = DEVICE_ACPI_HANDLE(&pci_dev->dev);
+ if (!handle)
+ handle = DEVICE_ACPI_HANDLE(pci_dev->bus->bridge);
+#ifdef CONFIG_PCI_IOV
+ if (!handle && pci_dev->is_virtfn)
+ handle = DEVICE_ACPI_HANDLE(physfn->bus->bridge);
+#endif
+ if (handle) {
+ acpi_status status;
+
+ do {
+ unsigned long long pxm;
+
+ status = acpi_evaluate_integer(handle, "_PXM",
+ NULL, &pxm);
+ if (ACPI_SUCCESS(status)) {
+ add.optarr[0] = pxm;
+ add.flags |= XEN_PCI_DEV_PXM;
+ break;
+ }
+ status = acpi_get_parent(handle, &handle);
+ } while (ACPI_SUCCESS(status));
+ }
+#endif /* CONFIG_ACPI */
+
+ r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, &add);
+ if (r != -ENOSYS)
+ return r;
+ pci_seg_supported = false;
+ }
+ if (pci_domain_nr(pci_dev->bus))
+ r = -ENOSYS;
#ifdef CONFIG_PCI_IOV
- if (pci_dev->is_virtfn) {
+ else if (pci_dev->is_virtfn) {
struct physdev_manage_pci_ext manage_pci_ext = {
.bus = pci_dev->bus->number,
.devfn = pci_dev->devfn,
.is_virtfn = 1,
- .physfn.bus = pci_dev->physfn->bus->number,
- .physfn.devfn = pci_dev->physfn->devfn,
+ .physfn.bus = physfn->bus->number,
+ .physfn.devfn = physfn->devfn,
};
r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
&manage_pci_ext);
- } else
+ }
#endif
- if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn)) {
+ else if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn)) {
struct physdev_manage_pci_ext manage_pci_ext = {
.bus = pci_dev->bus->number,
.devfn = pci_dev->devfn,
@@ -71,13 +131,27 @@ static int xen_remove_device(struct device *dev)
{
int r;
struct pci_dev *pci_dev = to_pci_dev(dev);
- struct physdev_manage_pci manage_pci;
- manage_pci.bus = pci_dev->bus->number;
- manage_pci.devfn = pci_dev->devfn;
+ if (pci_seg_supported) {
+ struct physdev_pci_device device = {
+ .seg = pci_domain_nr(pci_dev->bus),
+ .bus = pci_dev->bus->number,
+ .devfn = pci_dev->devfn
+ };
- r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_remove,
- &manage_pci);
+ r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_remove,
+ &device);
+ } else if (pci_domain_nr(pci_dev->bus))
+ r = -ENOSYS;
+ else {
+ struct physdev_manage_pci manage_pci = {
+ .bus = pci_dev->bus->number,
+ .devfn = pci_dev->devfn
+ };
+
+ r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_remove,
+ &manage_pci);
+ }
return r;
}
@@ -96,13 +170,16 @@ static int xen_pci_notifier(struct notifier_block *nb,
r = xen_remove_device(dev);
break;
default:
- break;
+ return NOTIFY_DONE;
}
-
- return r;
+ if (r)
+ dev_err(dev, "Failed to %s - passthrough or MSI/MSI-X might fail!\n",
+ action == BUS_NOTIFY_ADD_DEVICE ? "add" :
+ (action == BUS_NOTIFY_DEL_DEVICE ? "delete" : "?"));
+ return NOTIFY_OK;
}
-struct notifier_block device_nb = {
+static struct notifier_block device_nb = {
.notifier_call = xen_pci_notifier,
};
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 6e8c15a23201..c984768d98ca 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -38,6 +38,7 @@
#include <xen/swiotlb-xen.h>
#include <xen/page.h>
#include <xen/xen-ops.h>
+#include <xen/hvc-console.h>
/*
* Used to do a quick range check in swiotlb_tbl_unmap_single and
* swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
@@ -146,8 +147,10 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
void __init xen_swiotlb_init(int verbose)
{
unsigned long bytes;
- int rc;
+ int rc = -ENOMEM;
unsigned long nr_tbl;
+ char *m = NULL;
+ unsigned int repeat = 3;
nr_tbl = swioltb_nr_tbl();
if (nr_tbl)
@@ -156,16 +159,17 @@ void __init xen_swiotlb_init(int verbose)
xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
}
-
+retry:
bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;
/*
* Get IO TLB memory from any location.
*/
xen_io_tlb_start = alloc_bootmem(bytes);
- if (!xen_io_tlb_start)
- panic("Cannot allocate SWIOTLB buffer");
-
+ if (!xen_io_tlb_start) {
+ m = "Cannot allocate Xen-SWIOTLB buffer!\n";
+ goto error;
+ }
xen_io_tlb_end = xen_io_tlb_start + bytes;
/*
* And replace that memory with pages under 4GB.
@@ -173,17 +177,28 @@ void __init xen_swiotlb_init(int verbose)
rc = xen_swiotlb_fixup(xen_io_tlb_start,
bytes,
xen_io_tlb_nslabs);
- if (rc)
+ if (rc) {
+ free_bootmem(__pa(xen_io_tlb_start), bytes);
+ m = "Failed to get contiguous memory for DMA from Xen!\n"\
+ "You either: don't have the permissions, do not have"\
+ " enough free memory under 4GB, or the hypervisor memory"\
+ "is too fragmented!";
goto error;
-
+ }
start_dma_addr = xen_virt_to_bus(xen_io_tlb_start);
swiotlb_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs, verbose);
return;
error:
- panic("DMA(%d): Failed to exchange pages allocated for DMA with Xen! "\
- "We either don't have the permission or you do not have enough"\
- "free memory under 4GB!\n", rc);
+ if (repeat--) {
+ xen_io_tlb_nslabs = max(1024UL, /* Min is 2MB */
+ (xen_io_tlb_nslabs >> 1));
+ printk(KERN_INFO "Xen-SWIOTLB: Lowering to %luMB\n",
+ (xen_io_tlb_nslabs << IO_TLB_SHIFT) >> 20);
+ goto retry;
+ }
+ xen_raw_printk("%s (rc:%d)", m, rc);
+ panic("%s (rc:%d)", m, rc);
}
void *
@@ -194,6 +209,8 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
int order = get_order(size);
u64 dma_mask = DMA_BIT_MASK(32);
unsigned long vstart;
+ phys_addr_t phys;
+ dma_addr_t dev_addr;
/*
* Ignore region specifiers - the kernel's ideas of
@@ -209,18 +226,26 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
vstart = __get_free_pages(flags, order);
ret = (void *)vstart;
+ if (!ret)
+ return ret;
+
if (hwdev && hwdev->coherent_dma_mask)
- dma_mask = dma_alloc_coherent_mask(hwdev, flags);
+ dma_mask = hwdev->coherent_dma_mask;
- if (ret) {
+ phys = virt_to_phys(ret);
+ dev_addr = xen_phys_to_bus(phys);
+ if (((dev_addr + size - 1 <= dma_mask)) &&
+ !range_straddles_page_boundary(phys, size))
+ *dma_handle = dev_addr;
+ else {
if (xen_create_contiguous_region(vstart, order,
fls64(dma_mask)) != 0) {
free_pages(vstart, order);
return NULL;
}
- memset(ret, 0, size);
*dma_handle = virt_to_machine(ret).maddr;
}
+ memset(ret, 0, size);
return ret;
}
EXPORT_SYMBOL_GPL(xen_swiotlb_alloc_coherent);
@@ -230,11 +255,21 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
dma_addr_t dev_addr)
{
int order = get_order(size);
+ phys_addr_t phys;
+ u64 dma_mask = DMA_BIT_MASK(32);
if (dma_release_from_coherent(hwdev, order, vaddr))
return;
- xen_destroy_contiguous_region((unsigned long)vaddr, order);
+ if (hwdev && hwdev->coherent_dma_mask)
+ dma_mask = hwdev->coherent_dma_mask;
+
+ phys = virt_to_phys(vaddr);
+
+ if (((dev_addr + size - 1 > dma_mask)) ||
+ range_straddles_page_boundary(phys, size))
+ xen_destroy_contiguous_region((unsigned long)vaddr, order);
+
free_pages((unsigned long)vaddr, order);
}
EXPORT_SYMBOL_GPL(xen_swiotlb_free_coherent);
@@ -278,9 +313,10 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
/*
* Ensure that the address returned is DMA'ble
*/
- if (!dma_capable(dev, dev_addr, size))
- panic("map_single: bounce buffer is not DMA'ble");
-
+ if (!dma_capable(dev, dev_addr, size)) {
+ swiotlb_tbl_unmap_single(dev, map, size, dir);
+ dev_addr = 0;
+ }
return dev_addr;
}
EXPORT_SYMBOL_GPL(xen_swiotlb_map_page);
diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c
index 6ea852e25162..d93c70857e03 100644
--- a/drivers/xen/xen-selfballoon.c
+++ b/drivers/xen/xen-selfballoon.c
@@ -68,6 +68,8 @@
*/
#include <linux/kernel.h>
+#include <linux/bootmem.h>
+#include <linux/swap.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/module.h>
@@ -93,6 +95,15 @@ static unsigned int selfballoon_uphysteresis __read_mostly = 1;
/* In HZ, controls frequency of worker invocation. */
static unsigned int selfballoon_interval __read_mostly = 5;
+/*
+ * Minimum usable RAM in MB for selfballooning target for balloon.
+ * If non-zero, it is added to totalreserve_pages and self-ballooning
+ * will not balloon below the sum. If zero, a piecewise linear function
+ * is calculated as a minimum and added to totalreserve_pages. Note that
+ * setting this value indiscriminately may cause OOMs and crashes.
+ */
+static unsigned int selfballoon_min_usable_mb;
+
static void selfballoon_process(struct work_struct *work);
static DECLARE_DELAYED_WORK(selfballoon_worker, selfballoon_process);
@@ -189,20 +200,23 @@ static int __init xen_selfballooning_setup(char *s)
__setup("selfballooning", xen_selfballooning_setup);
#endif /* CONFIG_FRONTSWAP */
+#define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT))
+
/*
* Use current balloon size, the goal (vm_committed_as), and hysteresis
* parameters to set a new target balloon size
*/
static void selfballoon_process(struct work_struct *work)
{
- unsigned long cur_pages, goal_pages, tgt_pages;
+ unsigned long cur_pages, goal_pages, tgt_pages, floor_pages;
+ unsigned long useful_pages;
bool reset_timer = false;
if (xen_selfballooning_enabled) {
- cur_pages = balloon_stats.current_pages;
+ cur_pages = totalram_pages;
tgt_pages = cur_pages; /* default is no change */
goal_pages = percpu_counter_read_positive(&vm_committed_as) +
- balloon_stats.current_pages - totalram_pages;
+ totalreserve_pages;
#ifdef CONFIG_FRONTSWAP
/* allow space for frontswap pages to be repatriated */
if (frontswap_selfshrinking && frontswap_enabled)
@@ -217,7 +231,26 @@ static void selfballoon_process(struct work_struct *work)
((goal_pages - cur_pages) /
selfballoon_uphysteresis);
/* else if cur_pages == goal_pages, no change */
- balloon_set_new_target(tgt_pages);
+ useful_pages = max_pfn - totalreserve_pages;
+ if (selfballoon_min_usable_mb != 0)
+ floor_pages = totalreserve_pages +
+ MB2PAGES(selfballoon_min_usable_mb);
+ /* piecewise linear function ending in ~3% slope */
+ else if (useful_pages < MB2PAGES(16))
+ floor_pages = max_pfn; /* not worth ballooning */
+ else if (useful_pages < MB2PAGES(64))
+ floor_pages = totalreserve_pages + MB2PAGES(16) +
+ ((useful_pages - MB2PAGES(16)) >> 1);
+ else if (useful_pages < MB2PAGES(512))
+ floor_pages = totalreserve_pages + MB2PAGES(40) +
+ ((useful_pages - MB2PAGES(40)) >> 3);
+ else /* useful_pages >= MB2PAGES(512) */
+ floor_pages = totalreserve_pages + MB2PAGES(99) +
+ ((useful_pages - MB2PAGES(99)) >> 5);
+ if (tgt_pages < floor_pages)
+ tgt_pages = floor_pages;
+ balloon_set_new_target(tgt_pages +
+ balloon_stats.current_pages - totalram_pages);
reset_timer = true;
}
#ifdef CONFIG_FRONTSWAP
@@ -340,6 +373,31 @@ static ssize_t store_selfballoon_uphys(struct sys_device *dev,
static SYSDEV_ATTR(selfballoon_uphysteresis, S_IRUGO | S_IWUSR,
show_selfballoon_uphys, store_selfballoon_uphys);
+SELFBALLOON_SHOW(selfballoon_min_usable_mb, "%d\n",
+ selfballoon_min_usable_mb);
+
+static ssize_t store_selfballoon_min_usable_mb(struct sys_device *dev,
+ struct sysdev_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ unsigned long val;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ err = strict_strtoul(buf, 10, &val);
+ if (err || val == 0)
+ return -EINVAL;
+ selfballoon_min_usable_mb = val;
+ return count;
+}
+
+static SYSDEV_ATTR(selfballoon_min_usable_mb, S_IRUGO | S_IWUSR,
+ show_selfballoon_min_usable_mb,
+ store_selfballoon_min_usable_mb);
+
+
#ifdef CONFIG_FRONTSWAP
SELFBALLOON_SHOW(frontswap_selfshrinking, "%d\n", frontswap_selfshrinking);
@@ -421,6 +479,7 @@ static struct attribute *selfballoon_attrs[] = {
&attr_selfballoon_interval.attr,
&attr_selfballoon_downhysteresis.attr,
&attr_selfballoon_uphysteresis.attr,
+ &attr_selfballoon_min_usable_mb.attr,
#ifdef CONFIG_FRONTSWAP
&attr_frontswap_selfshrinking.attr,
&attr_frontswap_hysteresis.attr,
diff --git a/drivers/xen/xenbus/xenbus_comms.c b/drivers/xen/xenbus/xenbus_comms.c
index 090c61ee8fd0..2eff7a6aaa20 100644
--- a/drivers/xen/xenbus/xenbus_comms.c
+++ b/drivers/xen/xenbus/xenbus_comms.c
@@ -212,7 +212,9 @@ int xb_init_comms(void)
printk(KERN_WARNING "XENBUS response ring is not quiescent "
"(%08x:%08x): fixing up\n",
intf->rsp_cons, intf->rsp_prod);
- intf->rsp_cons = intf->rsp_prod;
+ /* breaks kdump */
+ if (!reset_devices)
+ intf->rsp_cons = intf->rsp_prod;
}
if (xenbus_irq) {
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index bd2f90c9ac8b..cef9b0bf63d5 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -684,64 +684,74 @@ static int __init xenbus_probe_initcall(void)
device_initcall(xenbus_probe_initcall);
-static int __init xenbus_init(void)
+/* Set up event channel for xenstored which is run as a local process
+ * (this is normally used only in dom0)
+ */
+static int __init xenstored_local_init(void)
{
int err = 0;
unsigned long page = 0;
+ struct evtchn_alloc_unbound alloc_unbound;
- DPRINTK("");
+ /* Allocate Xenstore page */
+ page = get_zeroed_page(GFP_KERNEL);
+ if (!page)
+ goto out_err;
- err = -ENODEV;
- if (!xen_domain())
- return err;
+ xen_store_mfn = xen_start_info->store_mfn =
+ pfn_to_mfn(virt_to_phys((void *)page) >>
+ PAGE_SHIFT);
- /*
- * Domain0 doesn't have a store_evtchn or store_mfn yet.
- */
- if (xen_initial_domain()) {
- struct evtchn_alloc_unbound alloc_unbound;
+ /* Next allocate a local port which xenstored can bind to */
+ alloc_unbound.dom = DOMID_SELF;
+ alloc_unbound.remote_dom = DOMID_SELF;
- /* Allocate Xenstore page */
- page = get_zeroed_page(GFP_KERNEL);
- if (!page)
- goto out_error;
+ err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
+ &alloc_unbound);
+ if (err == -ENOSYS)
+ goto out_err;
- xen_store_mfn = xen_start_info->store_mfn =
- pfn_to_mfn(virt_to_phys((void *)page) >>
- PAGE_SHIFT);
+ BUG_ON(err);
+ xen_store_evtchn = xen_start_info->store_evtchn =
+ alloc_unbound.port;
- /* Next allocate a local port which xenstored can bind to */
- alloc_unbound.dom = DOMID_SELF;
- alloc_unbound.remote_dom = 0;
+ return 0;
- err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
- &alloc_unbound);
- if (err == -ENOSYS)
- goto out_error;
+ out_err:
+ if (page != 0)
+ free_page(page);
+ return err;
+}
- BUG_ON(err);
- xen_store_evtchn = xen_start_info->store_evtchn =
- alloc_unbound.port;
+static int __init xenbus_init(void)
+{
+ int err = 0;
- xen_store_interface = mfn_to_virt(xen_store_mfn);
+ if (!xen_domain())
+ return -ENODEV;
+
+ if (xen_hvm_domain()) {
+ uint64_t v = 0;
+ err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
+ if (err)
+ goto out_error;
+ xen_store_evtchn = (int)v;
+ err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v);
+ if (err)
+ goto out_error;
+ xen_store_mfn = (unsigned long)v;
+ xen_store_interface = ioremap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
} else {
- if (xen_hvm_domain()) {
- uint64_t v = 0;
- err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
- if (err)
- goto out_error;
- xen_store_evtchn = (int)v;
- err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v);
+ xen_store_evtchn = xen_start_info->store_evtchn;
+ xen_store_mfn = xen_start_info->store_mfn;
+ if (xen_store_evtchn)
+ xenstored_ready = 1;
+ else {
+ err = xenstored_local_init();
if (err)
goto out_error;
- xen_store_mfn = (unsigned long)v;
- xen_store_interface = ioremap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
- } else {
- xen_store_evtchn = xen_start_info->store_evtchn;
- xen_store_mfn = xen_start_info->store_mfn;
- xen_store_interface = mfn_to_virt(xen_store_mfn);
- xenstored_ready = 1;
}
+ xen_store_interface = mfn_to_virt(xen_store_mfn);
}
/* Initialize the interface to xenstore. */
@@ -760,12 +770,7 @@ static int __init xenbus_init(void)
proc_mkdir("xen", NULL);
#endif
- return 0;
-
- out_error:
- if (page != 0)
- free_page(page);
-
+ out_error:
return err;
}
diff --git a/drivers/xen/xenbus/xenbus_probe_backend.c b/drivers/xen/xenbus/xenbus_probe_backend.c
index 60adf919d78d..32417b5064fd 100644
--- a/drivers/xen/xenbus/xenbus_probe_backend.c
+++ b/drivers/xen/xenbus/xenbus_probe_backend.c
@@ -104,8 +104,6 @@ static int xenbus_uevent_backend(struct device *dev,
xdev = to_xenbus_device(dev);
bus = container_of(xdev->dev.bus, struct xen_bus_type, bus);
- if (xdev == NULL)
- return -ENODEV;
if (add_uevent_var(env, "MODALIAS=xen-backend:%s", xdev->devicetype))
return -ENOMEM;
diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c b/drivers/xen/xenbus/xenbus_probe_frontend.c
index ed2ba474a560..540587e18a94 100644
--- a/drivers/xen/xenbus/xenbus_probe_frontend.c
+++ b/drivers/xen/xenbus/xenbus_probe_frontend.c
@@ -248,10 +248,131 @@ int __xenbus_register_frontend(struct xenbus_driver *drv,
}
EXPORT_SYMBOL_GPL(__xenbus_register_frontend);
+static DECLARE_WAIT_QUEUE_HEAD(backend_state_wq);
+static int backend_state;
+
+static void xenbus_reset_backend_state_changed(struct xenbus_watch *w,
+ const char **v, unsigned int l)
+{
+ xenbus_scanf(XBT_NIL, v[XS_WATCH_PATH], "", "%i", &backend_state);
+ printk(KERN_DEBUG "XENBUS: backend %s %s\n",
+ v[XS_WATCH_PATH], xenbus_strstate(backend_state));
+ wake_up(&backend_state_wq);
+}
+
+static void xenbus_reset_wait_for_backend(char *be, int expected)
+{
+ long timeout;
+ timeout = wait_event_interruptible_timeout(backend_state_wq,
+ backend_state == expected, 5 * HZ);
+ if (timeout <= 0)
+ printk(KERN_INFO "XENBUS: backend %s timed out.\n", be);
+}
+
+/*
+ * Reset frontend if it is in Connected or Closed state.
+ * Wait for backend to catch up.
+ * State Connected happens during kdump, Closed after kexec.
+ */
+static void xenbus_reset_frontend(char *fe, char *be, int be_state)
+{
+ struct xenbus_watch be_watch;
+
+ printk(KERN_DEBUG "XENBUS: backend %s %s\n",
+ be, xenbus_strstate(be_state));
+
+ memset(&be_watch, 0, sizeof(be_watch));
+ be_watch.node = kasprintf(GFP_NOIO | __GFP_HIGH, "%s/state", be);
+ if (!be_watch.node)
+ return;
+
+ be_watch.callback = xenbus_reset_backend_state_changed;
+ backend_state = XenbusStateUnknown;
+
+ printk(KERN_INFO "XENBUS: triggering reconnect on %s\n", be);
+ register_xenbus_watch(&be_watch);
+
+ /* fall through to forward backend to state XenbusStateInitialising */
+ switch (be_state) {
+ case XenbusStateConnected:
+ xenbus_printf(XBT_NIL, fe, "state", "%d", XenbusStateClosing);
+ xenbus_reset_wait_for_backend(be, XenbusStateClosing);
+
+ case XenbusStateClosing:
+ xenbus_printf(XBT_NIL, fe, "state", "%d", XenbusStateClosed);
+ xenbus_reset_wait_for_backend(be, XenbusStateClosed);
+
+ case XenbusStateClosed:
+ xenbus_printf(XBT_NIL, fe, "state", "%d", XenbusStateInitialising);
+ xenbus_reset_wait_for_backend(be, XenbusStateInitWait);
+ }
+
+ unregister_xenbus_watch(&be_watch);
+ printk(KERN_INFO "XENBUS: reconnect done on %s\n", be);
+ kfree(be_watch.node);
+}
+
+static void xenbus_check_frontend(char *class, char *dev)
+{
+ int be_state, fe_state, err;
+ char *backend, *frontend;
+
+ frontend = kasprintf(GFP_NOIO | __GFP_HIGH, "device/%s/%s", class, dev);
+ if (!frontend)
+ return;
+
+ err = xenbus_scanf(XBT_NIL, frontend, "state", "%i", &fe_state);
+ if (err != 1)
+ goto out;
+
+ switch (fe_state) {
+ case XenbusStateConnected:
+ case XenbusStateClosed:
+ printk(KERN_DEBUG "XENBUS: frontend %s %s\n",
+ frontend, xenbus_strstate(fe_state));
+ backend = xenbus_read(XBT_NIL, frontend, "backend", NULL);
+ if (!backend || IS_ERR(backend))
+ goto out;
+ err = xenbus_scanf(XBT_NIL, backend, "state", "%i", &be_state);
+ if (err == 1)
+ xenbus_reset_frontend(frontend, backend, be_state);
+ kfree(backend);
+ break;
+ default:
+ break;
+ }
+out:
+ kfree(frontend);
+}
+
+static void xenbus_reset_state(void)
+{
+ char **devclass, **dev;
+ int devclass_n, dev_n;
+ int i, j;
+
+ devclass = xenbus_directory(XBT_NIL, "device", "", &devclass_n);
+ if (IS_ERR(devclass))
+ return;
+
+ for (i = 0; i < devclass_n; i++) {
+ dev = xenbus_directory(XBT_NIL, "device", devclass[i], &dev_n);
+ if (IS_ERR(dev))
+ continue;
+ for (j = 0; j < dev_n; j++)
+ xenbus_check_frontend(devclass[i], dev[j]);
+ kfree(dev);
+ }
+ kfree(devclass);
+}
+
static int frontend_probe_and_watch(struct notifier_block *notifier,
unsigned long event,
void *data)
{
+ /* reset devices in Connected or Closed state */
+ if (xen_hvm_domain())
+ xenbus_reset_state();
/* Enumerate devices in xenstore and watch for changes. */
xenbus_probe_devices(&xenbus_frontend);
register_xenbus_watch(&fe_watch);
diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
index 5534690075af..b3b8f2f3ad10 100644
--- a/drivers/xen/xenbus/xenbus_xs.c
+++ b/drivers/xen/xenbus/xenbus_xs.c
@@ -45,6 +45,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <xen/xenbus.h>
+#include <xen/xen.h>
#include "xenbus_comms.h"
struct xs_stored_msg {
@@ -620,6 +621,15 @@ static struct xenbus_watch *find_watch(const char *token)
return NULL;
}
+static void xs_reset_watches(void)
+{
+ int err;
+
+ err = xs_error(xs_single(XBT_NIL, XS_RESET_WATCHES, "", NULL));
+ if (err && err != -EEXIST)
+ printk(KERN_WARNING "xs_reset_watches failed: %d\n", err);
+}
+
/* Register callback to watch this node. */
int register_xenbus_watch(struct xenbus_watch *watch)
{
@@ -638,8 +648,7 @@ int register_xenbus_watch(struct xenbus_watch *watch)
err = xs_watch(watch->node, token);
- /* Ignore errors due to multiple registration. */
- if ((err != 0) && (err != -EEXIST)) {
+ if (err) {
spin_lock(&watches_lock);
list_del(&watch->list);
spin_unlock(&watches_lock);
@@ -897,5 +906,9 @@ int xs_init(void)
if (IS_ERR(task))
return PTR_ERR(task);
+ /* shutdown watches for kexec boot */
+ if (xen_hvm_domain())
+ xs_reset_watches();
+
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-16 09:00:46 +0000