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-rw-r--r--drivers/xen/Kconfig9
-rw-r--r--drivers/xen/Makefile1
-rw-r--r--drivers/xen/balloon.c7
-rw-r--r--drivers/xen/efi.c2
-rw-r--r--drivers/xen/events/events_base.c7
-rw-r--r--drivers/xen/events/events_fifo.c55
-rw-r--r--drivers/xen/gntalloc.c16
-rw-r--r--drivers/xen/grant-table.c311
-rw-r--r--drivers/xen/manage.c7
-rw-r--r--drivers/xen/pci.c27
-rw-r--r--drivers/xen/xen-pciback/pci_stub.c6
-rw-r--r--drivers/xen/xen-pciback/xenbus.c7
-rw-r--r--drivers/xen/xen-scsiback.c2126
-rw-r--r--drivers/xen/xenbus/xenbus_client.c9
-rw-r--r--drivers/xen/xenbus/xenbus_probe.c6
-rw-r--r--drivers/xen/xenbus/xenbus_probe.h4
-rw-r--r--drivers/xen/xenbus/xenbus_probe_backend.c8
-rw-r--r--drivers/xen/xenbus/xenbus_probe_frontend.c8
18 files changed, 2237 insertions, 379 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 8bc01838daf9..b812462083fc 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -172,6 +172,15 @@ config XEN_PCIDEV_BACKEND
If in doubt, say m.
+config XEN_SCSI_BACKEND
+ tristate "XEN SCSI backend driver"
+ depends on XEN && XEN_BACKEND && TARGET_CORE
+ help
+ The SCSI backend driver allows the kernel to export its SCSI Devices
+ to other guests via a high-performance shared-memory interface.
+ Only needed for systems running as XEN driver domains (e.g. Dom0) and
+ if guests need generic access to SCSI devices.
+
config XEN_PRIVCMD
tristate
depends on XEN
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 84044b554e33..2140398a2a8c 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_XEN_ACPI_HOTPLUG_MEMORY) += xen-acpi-memhotplug.o
obj-$(CONFIG_XEN_ACPI_HOTPLUG_CPU) += xen-acpi-cpuhotplug.o
obj-$(CONFIG_XEN_ACPI_PROCESSOR) += xen-acpi-processor.o
obj-$(CONFIG_XEN_EFI) += efi.o
+obj-$(CONFIG_XEN_SCSI_BACKEND) += xen-scsiback.o
xen-evtchn-y := evtchn.o
xen-gntdev-y := gntdev.o
xen-gntalloc-y := gntalloc.o
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 5c660c77f03b..3860d02729dc 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -167,6 +167,9 @@ static struct page *balloon_next_page(struct page *page)
static enum bp_state update_schedule(enum bp_state state)
{
+ if (state == BP_ECANCELED)
+ return BP_ECANCELED;
+
if (state == BP_DONE) {
balloon_stats.schedule_delay = 1;
balloon_stats.retry_count = 1;
@@ -230,8 +233,8 @@ static enum bp_state reserve_additional_memory(long credit)
rc = add_memory(nid, hotplug_start_paddr, balloon_hotplug << PAGE_SHIFT);
if (rc) {
- pr_info("%s: add_memory() failed: %i\n", __func__, rc);
- return BP_EAGAIN;
+ pr_warn("Cannot add additional memory (%i)\n", rc);
+ return BP_ECANCELED;
}
balloon_hotplug -= credit;
diff --git a/drivers/xen/efi.c b/drivers/xen/efi.c
index 31f618a49661..1f850c97482f 100644
--- a/drivers/xen/efi.c
+++ b/drivers/xen/efi.c
@@ -27,6 +27,8 @@
#include <xen/interface/platform.h>
#include <xen/xen.h>
+#include <asm/page.h>
+
#include <asm/xen/hypercall.h>
#define INIT_EFI_OP(name) \
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index c919d3d5c845..b4bca2d4a7e5 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -246,7 +246,7 @@ static void xen_irq_info_cleanup(struct irq_info *info)
*/
unsigned int evtchn_from_irq(unsigned irq)
{
- if (unlikely(WARN(irq < 0 || irq >= nr_irqs, "Invalid irq %d!\n", irq)))
+ if (unlikely(WARN(irq >= nr_irqs, "Invalid irq %d!\n", irq)))
return 0;
return info_for_irq(irq)->evtchn;
@@ -900,8 +900,8 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
return irq;
}
-static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
- unsigned int remote_port)
+int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
+ unsigned int remote_port)
{
struct evtchn_bind_interdomain bind_interdomain;
int err;
@@ -914,6 +914,7 @@ static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
return err ? : bind_evtchn_to_irq(bind_interdomain.local_port);
}
+EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irq);
static int find_virq(unsigned int virq, unsigned int cpu)
{
diff --git a/drivers/xen/events/events_fifo.c b/drivers/xen/events/events_fifo.c
index 84b4bfb84344..417415d738d0 100644
--- a/drivers/xen/events/events_fifo.c
+++ b/drivers/xen/events/events_fifo.c
@@ -67,10 +67,9 @@ static event_word_t *event_array[MAX_EVENT_ARRAY_PAGES] __read_mostly;
static unsigned event_array_pages __read_mostly;
/*
- * sync_set_bit() and friends must be unsigned long aligned on non-x86
- * platforms.
+ * sync_set_bit() and friends must be unsigned long aligned.
*/
-#if !defined(CONFIG_X86) && BITS_PER_LONG > 32
+#if BITS_PER_LONG > 32
#define BM(w) (unsigned long *)((unsigned long)w & ~0x7UL)
#define EVTCHN_FIFO_BIT(b, w) \
@@ -100,6 +99,25 @@ static unsigned evtchn_fifo_nr_channels(void)
return event_array_pages * EVENT_WORDS_PER_PAGE;
}
+static int init_control_block(int cpu,
+ struct evtchn_fifo_control_block *control_block)
+{
+ struct evtchn_fifo_queue *q = &per_cpu(cpu_queue, cpu);
+ struct evtchn_init_control init_control;
+ unsigned int i;
+
+ /* Reset the control block and the local HEADs. */
+ clear_page(control_block);
+ for (i = 0; i < EVTCHN_FIFO_MAX_QUEUES; i++)
+ q->head[i] = 0;
+
+ init_control.control_gfn = virt_to_mfn(control_block);
+ init_control.offset = 0;
+ init_control.vcpu = cpu;
+
+ return HYPERVISOR_event_channel_op(EVTCHNOP_init_control, &init_control);
+}
+
static void free_unused_array_pages(void)
{
unsigned i;
@@ -312,7 +330,7 @@ static void evtchn_fifo_handle_events(unsigned cpu)
ready = xchg(&control_block->ready, 0);
while (ready) {
- q = find_first_bit(BM(&ready), EVTCHN_FIFO_MAX_QUEUES);
+ q = find_first_bit(&ready, EVTCHN_FIFO_MAX_QUEUES);
consume_one_event(cpu, control_block, q, &ready);
ready |= xchg(&control_block->ready, 0);
}
@@ -324,7 +342,6 @@ static void evtchn_fifo_resume(void)
for_each_possible_cpu(cpu) {
void *control_block = per_cpu(cpu_control_block, cpu);
- struct evtchn_init_control init_control;
int ret;
if (!control_block)
@@ -341,12 +358,7 @@ static void evtchn_fifo_resume(void)
continue;
}
- init_control.control_gfn = virt_to_mfn(control_block);
- init_control.offset = 0;
- init_control.vcpu = cpu;
-
- ret = HYPERVISOR_event_channel_op(EVTCHNOP_init_control,
- &init_control);
+ ret = init_control_block(cpu, control_block);
if (ret < 0)
BUG();
}
@@ -374,30 +386,25 @@ static const struct evtchn_ops evtchn_ops_fifo = {
.resume = evtchn_fifo_resume,
};
-static int evtchn_fifo_init_control_block(unsigned cpu)
+static int evtchn_fifo_alloc_control_block(unsigned cpu)
{
- struct page *control_block = NULL;
- struct evtchn_init_control init_control;
+ void *control_block = NULL;
int ret = -ENOMEM;
- control_block = alloc_page(GFP_KERNEL|__GFP_ZERO);
+ control_block = (void *)__get_free_page(GFP_KERNEL);
if (control_block == NULL)
goto error;
- init_control.control_gfn = virt_to_mfn(page_address(control_block));
- init_control.offset = 0;
- init_control.vcpu = cpu;
-
- ret = HYPERVISOR_event_channel_op(EVTCHNOP_init_control, &init_control);
+ ret = init_control_block(cpu, control_block);
if (ret < 0)
goto error;
- per_cpu(cpu_control_block, cpu) = page_address(control_block);
+ per_cpu(cpu_control_block, cpu) = control_block;
return 0;
error:
- __free_page(control_block);
+ free_page((unsigned long)control_block);
return ret;
}
@@ -411,7 +418,7 @@ static int evtchn_fifo_cpu_notification(struct notifier_block *self,
switch (action) {
case CPU_UP_PREPARE:
if (!per_cpu(cpu_control_block, cpu))
- ret = evtchn_fifo_init_control_block(cpu);
+ ret = evtchn_fifo_alloc_control_block(cpu);
break;
default:
break;
@@ -428,7 +435,7 @@ int __init xen_evtchn_fifo_init(void)
int cpu = get_cpu();
int ret;
- ret = evtchn_fifo_init_control_block(cpu);
+ ret = evtchn_fifo_alloc_control_block(cpu);
if (ret < 0)
goto out;
diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index 787d17945418..e53fe191738c 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -124,7 +124,7 @@ static int add_grefs(struct ioctl_gntalloc_alloc_gref *op,
int i, rc, readonly;
LIST_HEAD(queue_gref);
LIST_HEAD(queue_file);
- struct gntalloc_gref *gref;
+ struct gntalloc_gref *gref, *next;
readonly = !(op->flags & GNTALLOC_FLAG_WRITABLE);
rc = -ENOMEM;
@@ -141,13 +141,11 @@ static int add_grefs(struct ioctl_gntalloc_alloc_gref *op,
goto undo;
/* Grant foreign access to the page. */
- gref->gref_id = gnttab_grant_foreign_access(op->domid,
+ rc = gnttab_grant_foreign_access(op->domid,
pfn_to_mfn(page_to_pfn(gref->page)), readonly);
- if ((int)gref->gref_id < 0) {
- rc = gref->gref_id;
+ if (rc < 0)
goto undo;
- }
- gref_ids[i] = gref->gref_id;
+ gref_ids[i] = gref->gref_id = rc;
}
/* Add to gref lists. */
@@ -162,8 +160,8 @@ undo:
mutex_lock(&gref_mutex);
gref_size -= (op->count - i);
- list_for_each_entry(gref, &queue_file, next_file) {
- /* __del_gref does not remove from queue_file */
+ list_for_each_entry_safe(gref, next, &queue_file, next_file) {
+ list_del(&gref->next_file);
__del_gref(gref);
}
@@ -193,7 +191,7 @@ static void __del_gref(struct gntalloc_gref *gref)
gref->notify.flags = 0;
- if (gref->gref_id > 0) {
+ if (gref->gref_id) {
if (gnttab_query_foreign_access(gref->gref_id))
return;
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index eeba7544f0cd..7786291ba229 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -69,7 +69,6 @@ struct grant_frames xen_auto_xlat_grant_frames;
static union {
struct grant_entry_v1 *v1;
- union grant_entry_v2 *v2;
void *addr;
} gnttab_shared;
@@ -120,36 +119,10 @@ struct gnttab_ops {
* by bit operations.
*/
int (*query_foreign_access)(grant_ref_t ref);
- /*
- * Grant a domain to access a range of bytes within the page referred by
- * an available grant entry. Ref parameter is reference of a grant entry
- * which will be sub-page accessed, domid is id of grantee domain, frame
- * is frame address of subpage grant, flags is grant type and flag
- * information, page_off is offset of the range of bytes, and length is
- * length of bytes to be accessed.
- */
- void (*update_subpage_entry)(grant_ref_t ref, domid_t domid,
- unsigned long frame, int flags,
- unsigned page_off, unsigned length);
- /*
- * Redirect an available grant entry on domain A to another grant
- * reference of domain B, then allow domain C to use grant reference
- * of domain B transitively. Ref parameter is an available grant entry
- * reference on domain A, domid is id of domain C which accesses grant
- * entry transitively, flags is grant type and flag information,
- * trans_domid is id of domain B whose grant entry is finally accessed
- * transitively, trans_gref is grant entry transitive reference of
- * domain B.
- */
- void (*update_trans_entry)(grant_ref_t ref, domid_t domid, int flags,
- domid_t trans_domid, grant_ref_t trans_gref);
};
static struct gnttab_ops *gnttab_interface;
-/*This reflects status of grant entries, so act as a global value*/
-static grant_status_t *grstatus;
-
static int grant_table_version;
static int grefs_per_grant_frame;
@@ -231,7 +204,7 @@ static void put_free_entry(grant_ref_t ref)
}
/*
- * Following applies to gnttab_update_entry_v1 and gnttab_update_entry_v2.
+ * Following applies to gnttab_update_entry_v1.
* Introducing a valid entry into the grant table:
* 1. Write ent->domid.
* 2. Write ent->frame:
@@ -250,15 +223,6 @@ static void gnttab_update_entry_v1(grant_ref_t ref, domid_t domid,
gnttab_shared.v1[ref].flags = flags;
}
-static void gnttab_update_entry_v2(grant_ref_t ref, domid_t domid,
- unsigned long frame, unsigned flags)
-{
- gnttab_shared.v2[ref].hdr.domid = domid;
- gnttab_shared.v2[ref].full_page.frame = frame;
- wmb();
- gnttab_shared.v2[ref].hdr.flags = GTF_permit_access | flags;
-}
-
/*
* Public grant-issuing interface functions
*/
@@ -285,132 +249,11 @@ int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access);
-static void gnttab_update_subpage_entry_v2(grant_ref_t ref, domid_t domid,
- unsigned long frame, int flags,
- unsigned page_off, unsigned length)
-{
- gnttab_shared.v2[ref].sub_page.frame = frame;
- gnttab_shared.v2[ref].sub_page.page_off = page_off;
- gnttab_shared.v2[ref].sub_page.length = length;
- gnttab_shared.v2[ref].hdr.domid = domid;
- wmb();
- gnttab_shared.v2[ref].hdr.flags =
- GTF_permit_access | GTF_sub_page | flags;
-}
-
-int gnttab_grant_foreign_access_subpage_ref(grant_ref_t ref, domid_t domid,
- unsigned long frame, int flags,
- unsigned page_off,
- unsigned length)
-{
- if (flags & (GTF_accept_transfer | GTF_reading |
- GTF_writing | GTF_transitive))
- return -EPERM;
-
- if (gnttab_interface->update_subpage_entry == NULL)
- return -ENOSYS;
-
- gnttab_interface->update_subpage_entry(ref, domid, frame, flags,
- page_off, length);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_subpage_ref);
-
-int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
- int flags, unsigned page_off,
- unsigned length)
-{
- int ref, rc;
-
- ref = get_free_entries(1);
- if (unlikely(ref < 0))
- return -ENOSPC;
-
- rc = gnttab_grant_foreign_access_subpage_ref(ref, domid, frame, flags,
- page_off, length);
- if (rc < 0) {
- put_free_entry(ref);
- return rc;
- }
-
- return ref;
-}
-EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_subpage);
-
-bool gnttab_subpage_grants_available(void)
-{
- return gnttab_interface->update_subpage_entry != NULL;
-}
-EXPORT_SYMBOL_GPL(gnttab_subpage_grants_available);
-
-static void gnttab_update_trans_entry_v2(grant_ref_t ref, domid_t domid,
- int flags, domid_t trans_domid,
- grant_ref_t trans_gref)
-{
- gnttab_shared.v2[ref].transitive.trans_domid = trans_domid;
- gnttab_shared.v2[ref].transitive.gref = trans_gref;
- gnttab_shared.v2[ref].hdr.domid = domid;
- wmb();
- gnttab_shared.v2[ref].hdr.flags =
- GTF_permit_access | GTF_transitive | flags;
-}
-
-int gnttab_grant_foreign_access_trans_ref(grant_ref_t ref, domid_t domid,
- int flags, domid_t trans_domid,
- grant_ref_t trans_gref)
-{
- if (flags & (GTF_accept_transfer | GTF_reading |
- GTF_writing | GTF_sub_page))
- return -EPERM;
-
- if (gnttab_interface->update_trans_entry == NULL)
- return -ENOSYS;
-
- gnttab_interface->update_trans_entry(ref, domid, flags, trans_domid,
- trans_gref);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_trans_ref);
-
-int gnttab_grant_foreign_access_trans(domid_t domid, int flags,
- domid_t trans_domid,
- grant_ref_t trans_gref)
-{
- int ref, rc;
-
- ref = get_free_entries(1);
- if (unlikely(ref < 0))
- return -ENOSPC;
-
- rc = gnttab_grant_foreign_access_trans_ref(ref, domid, flags,
- trans_domid, trans_gref);
- if (rc < 0) {
- put_free_entry(ref);
- return rc;
- }
-
- return ref;
-}
-EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_trans);
-
-bool gnttab_trans_grants_available(void)
-{
- return gnttab_interface->update_trans_entry != NULL;
-}
-EXPORT_SYMBOL_GPL(gnttab_trans_grants_available);
-
static int gnttab_query_foreign_access_v1(grant_ref_t ref)
{
return gnttab_shared.v1[ref].flags & (GTF_reading|GTF_writing);
}
-static int gnttab_query_foreign_access_v2(grant_ref_t ref)
-{
- return grstatus[ref] & (GTF_reading|GTF_writing);
-}
-
int gnttab_query_foreign_access(grant_ref_t ref)
{
return gnttab_interface->query_foreign_access(ref);
@@ -433,29 +276,6 @@ static int gnttab_end_foreign_access_ref_v1(grant_ref_t ref, int readonly)
return 1;
}
-static int gnttab_end_foreign_access_ref_v2(grant_ref_t ref, int readonly)
-{
- gnttab_shared.v2[ref].hdr.flags = 0;
- mb();
- if (grstatus[ref] & (GTF_reading|GTF_writing)) {
- return 0;
- } else {
- /* The read of grstatus needs to have acquire
- semantics. On x86, reads already have
- that, and we just need to protect against
- compiler reorderings. On other
- architectures we may need a full
- barrier. */
-#ifdef CONFIG_X86
- barrier();
-#else
- mb();
-#endif
- }
-
- return 1;
-}
-
static inline int _gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly)
{
return gnttab_interface->end_foreign_access_ref(ref, readonly);
@@ -616,37 +436,6 @@ static unsigned long gnttab_end_foreign_transfer_ref_v1(grant_ref_t ref)
return frame;
}
-static unsigned long gnttab_end_foreign_transfer_ref_v2(grant_ref_t ref)
-{
- unsigned long frame;
- u16 flags;
- u16 *pflags;
-
- pflags = &gnttab_shared.v2[ref].hdr.flags;
-
- /*
- * If a transfer is not even yet started, try to reclaim the grant
- * reference and return failure (== 0).
- */
- while (!((flags = *pflags) & GTF_transfer_committed)) {
- if (sync_cmpxchg(pflags, flags, 0) == flags)
- return 0;
- cpu_relax();
- }
-
- /* If a transfer is in progress then wait until it is completed. */
- while (!(flags & GTF_transfer_completed)) {
- flags = *pflags;
- cpu_relax();
- }
-
- rmb(); /* Read the frame number /after/ reading completion status. */
- frame = gnttab_shared.v2[ref].full_page.frame;
- BUG_ON(frame == 0);
-
- return frame;
-}
-
unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref)
{
return gnttab_interface->end_foreign_transfer_ref(ref);
@@ -803,7 +592,7 @@ static int grow_gnttab_list(unsigned int more_frames)
return 0;
grow_nomem:
- for ( ; i >= nr_glist_frames; i--)
+ while (i-- > nr_glist_frames)
free_page((unsigned long) gnttab_list[i]);
return -ENOMEM;
}
@@ -962,12 +751,6 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
}
EXPORT_SYMBOL_GPL(gnttab_unmap_refs);
-static unsigned nr_status_frames(unsigned nr_grant_frames)
-{
- BUG_ON(grefs_per_grant_frame == 0);
- return (nr_grant_frames * grefs_per_grant_frame + SPP - 1) / SPP;
-}
-
static int gnttab_map_frames_v1(xen_pfn_t *frames, unsigned int nr_gframes)
{
int rc;
@@ -985,55 +768,6 @@ static void gnttab_unmap_frames_v1(void)
arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames);
}
-static int gnttab_map_frames_v2(xen_pfn_t *frames, unsigned int nr_gframes)
-{
- uint64_t *sframes;
- unsigned int nr_sframes;
- struct gnttab_get_status_frames getframes;
- int rc;
-
- nr_sframes = nr_status_frames(nr_gframes);
-
- /* No need for kzalloc as it is initialized in following hypercall
- * GNTTABOP_get_status_frames.
- */
- sframes = kmalloc(nr_sframes * sizeof(uint64_t), GFP_ATOMIC);
- if (!sframes)
- return -ENOMEM;
-
- getframes.dom = DOMID_SELF;
- getframes.nr_frames = nr_sframes;
- set_xen_guest_handle(getframes.frame_list, sframes);
-
- rc = HYPERVISOR_grant_table_op(GNTTABOP_get_status_frames,
- &getframes, 1);
- if (rc == -ENOSYS) {
- kfree(sframes);
- return -ENOSYS;
- }
-
- BUG_ON(rc || getframes.status);
-
- rc = arch_gnttab_map_status(sframes, nr_sframes,
- nr_status_frames(gnttab_max_grant_frames()),
- &grstatus);
- BUG_ON(rc);
- kfree(sframes);
-
- rc = arch_gnttab_map_shared(frames, nr_gframes,
- gnttab_max_grant_frames(),
- &gnttab_shared.addr);
- BUG_ON(rc);
-
- return 0;
-}
-
-static void gnttab_unmap_frames_v2(void)
-{
- arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames);
- arch_gnttab_unmap(grstatus, nr_status_frames(nr_grant_frames));
-}
-
static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
{
struct gnttab_setup_table setup;
@@ -1101,43 +835,13 @@ static struct gnttab_ops gnttab_v1_ops = {
.query_foreign_access = gnttab_query_foreign_access_v1,
};
-static struct gnttab_ops gnttab_v2_ops = {
- .map_frames = gnttab_map_frames_v2,
- .unmap_frames = gnttab_unmap_frames_v2,
- .update_entry = gnttab_update_entry_v2,
- .end_foreign_access_ref = gnttab_end_foreign_access_ref_v2,
- .end_foreign_transfer_ref = gnttab_end_foreign_transfer_ref_v2,
- .query_foreign_access = gnttab_query_foreign_access_v2,
- .update_subpage_entry = gnttab_update_subpage_entry_v2,
- .update_trans_entry = gnttab_update_trans_entry_v2,
-};
-
static void gnttab_request_version(void)
{
- int rc;
- struct gnttab_set_version gsv;
+ /* Only version 1 is used, which will always be available. */
+ grant_table_version = 1;
+ grefs_per_grant_frame = PAGE_SIZE / sizeof(struct grant_entry_v1);
+ gnttab_interface = &gnttab_v1_ops;
- gsv.version = 1;
-
- rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1);
- if (rc == 0 && gsv.version == 2) {
- grant_table_version = 2;
- grefs_per_grant_frame = PAGE_SIZE / sizeof(union grant_entry_v2);
- gnttab_interface = &gnttab_v2_ops;
- } else if (grant_table_version == 2) {
- /*
- * If we've already used version 2 features,
- * but then suddenly discover that they're not
- * available (e.g. migrating to an older
- * version of Xen), almost unbounded badness
- * can happen.
- */
- panic("we need grant tables version 2, but only version 1 is available");
- } else {
- grant_table_version = 1;
- grefs_per_grant_frame = PAGE_SIZE / sizeof(struct grant_entry_v1);
- gnttab_interface = &gnttab_v1_ops;
- }
pr_info("Grant tables using version %d layout\n", grant_table_version);
}
@@ -1225,8 +929,7 @@ int gnttab_init(void)
}
}
- ret = arch_gnttab_init(max_nr_grant_frames,
- nr_status_frames(max_nr_grant_frames));
+ ret = arch_gnttab_init(max_nr_grant_frames);
if (ret < 0)
goto ini_nomem;
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index 5f1e1f3cd186..f8bb36f9d9ce 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -103,16 +103,11 @@ static void do_suspend(void)
shutting_down = SHUTDOWN_SUSPEND;
-#ifdef CONFIG_PREEMPT
- /* If the kernel is preemptible, we need to freeze all the processes
- to prevent them from being in the middle of a pagetable update
- during suspend. */
err = freeze_processes();
if (err) {
pr_err("%s: freeze failed %d\n", __func__, err);
goto out;
}
-#endif
err = dpm_suspend_start(PMSG_FREEZE);
if (err) {
@@ -157,10 +152,8 @@ out_resume:
dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
out_thaw:
-#ifdef CONFIG_PREEMPT
thaw_processes();
out:
-#endif
shutting_down = SHUTDOWN_INVALID;
}
#endif /* CONFIG_HIBERNATE_CALLBACKS */
diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index dd9c249ea311..95ee4302ffb8 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -41,24 +41,29 @@ static int xen_add_device(struct device *dev)
#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
+ struct {
+ struct physdev_pci_device_add add;
+ uint32_t pxm;
+ } add_ext = {
+ .add.seg = pci_domain_nr(pci_dev->bus),
+ .add.bus = pci_dev->bus->number,
+ .add.devfn = pci_dev->devfn
};
+ struct physdev_pci_device_add *add = &add_ext.add;
+
#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;
+ 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;
+ add->flags = XEN_PCI_DEV_EXTFN;
#ifdef CONFIG_ACPI
handle = ACPI_HANDLE(&pci_dev->dev);
@@ -77,8 +82,8 @@ static int xen_add_device(struct device *dev)
status = acpi_evaluate_integer(handle, "_PXM",
NULL, &pxm);
if (ACPI_SUCCESS(status)) {
- add.optarr[0] = pxm;
- add.flags |= XEN_PCI_DEV_PXM;
+ add->optarr[0] = pxm;
+ add->flags |= XEN_PCI_DEV_PXM;
break;
}
status = acpi_get_parent(handle, &handle);
@@ -86,7 +91,7 @@ static int xen_add_device(struct device *dev)
}
#endif /* CONFIG_ACPI */
- r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, &add);
+ r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, add);
if (r != -ENOSYS)
return r;
pci_seg_supported = false;
diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
index d57a173685f3..017069a455d4 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -133,7 +133,7 @@ static void pcistub_device_release(struct kref *kref)
xen_pcibk_config_free_dyn_fields(dev);
xen_pcibk_config_free_dev(dev);
- dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
+ pci_clear_dev_assigned(dev);
pci_dev_put(dev);
kfree(psdev);
@@ -413,7 +413,7 @@ static int pcistub_init_device(struct pci_dev *dev)
dev_dbg(&dev->dev, "reset device\n");
xen_pcibk_reset_device(dev);
- dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
+ pci_set_dev_assigned(dev);
return 0;
config_release:
@@ -579,7 +579,7 @@ static void pcistub_remove(struct pci_dev *dev)
}
}
-static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = {
+static const struct pci_device_id pcistub_ids[] = {
{
.vendor = PCI_ANY_ID,
.device = PCI_ANY_ID,
diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
index 4a7e6e0a5f4c..ad8d30c088fe 100644
--- a/drivers/xen/xen-pciback/xenbus.c
+++ b/drivers/xen/xen-pciback/xenbus.c
@@ -174,6 +174,7 @@ static int xen_pcibk_attach(struct xen_pcibk_device *pdev)
"version mismatch (%s/%s) with pcifront - "
"halting " DRV_NAME,
magic, XEN_PCI_MAGIC);
+ err = -EFAULT;
goto out;
}
@@ -718,11 +719,13 @@ static const struct xenbus_device_id xen_pcibk_ids[] = {
{""},
};
-static DEFINE_XENBUS_DRIVER(xen_pcibk, DRV_NAME,
+static struct xenbus_driver xen_pcibk_driver = {
+ .name = DRV_NAME,
+ .ids = xen_pcibk_ids,
.probe = xen_pcibk_xenbus_probe,
.remove = xen_pcibk_xenbus_remove,
.otherend_changed = xen_pcibk_frontend_changed,
-);
+};
const struct xen_pcibk_backend *__read_mostly xen_pcibk_backend;
diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
new file mode 100644
index 000000000000..3e32146472a5
--- /dev/null
+++ b/drivers/xen/xen-scsiback.c
@@ -0,0 +1,2126 @@
+/*
+ * Xen SCSI backend driver
+ *
+ * Copyright (c) 2008, FUJITSU Limited
+ *
+ * Based on the blkback driver code.
+ * Adaption to kernel taget core infrastructure taken from vhost/scsi.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <stdarg.h>
+
+#include <linux/module.h>
+#include <linux/utsname.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/gfp.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/configfs.h>
+
+#include <generated/utsrelease.h>
+
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_tcq.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+#include <target/target_core_configfs.h>
+#include <target/target_core_fabric_configfs.h>
+
+#include <asm/hypervisor.h>
+
+#include <xen/xen.h>
+#include <xen/balloon.h>
+#include <xen/events.h>
+#include <xen/xenbus.h>
+#include <xen/grant_table.h>
+#include <xen/page.h>
+
+#include <xen/interface/grant_table.h>
+#include <xen/interface/io/vscsiif.h>
+
+#define DPRINTK(_f, _a...) \
+ pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a)
+
+#define VSCSI_VERSION "v0.1"
+#define VSCSI_NAMELEN 32
+
+struct ids_tuple {
+ unsigned int hst; /* host */
+ unsigned int chn; /* channel */
+ unsigned int tgt; /* target */
+ unsigned int lun; /* LUN */
+};
+
+struct v2p_entry {
+ struct ids_tuple v; /* translate from */
+ struct scsiback_tpg *tpg; /* translate to */
+ unsigned int lun;
+ struct kref kref;
+ struct list_head l;
+};
+
+struct vscsibk_info {
+ struct xenbus_device *dev;
+
+ domid_t domid;
+ unsigned int irq;
+
+ struct vscsiif_back_ring ring;
+ int ring_error;
+
+ spinlock_t ring_lock;
+ atomic_t nr_unreplied_reqs;
+
+ spinlock_t v2p_lock;
+ struct list_head v2p_entry_lists;
+
+ wait_queue_head_t waiting_to_free;
+};
+
+/* theoretical maximum of grants for one request */
+#define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE)
+
+/*
+ * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one
+ * call to map/unmap grants. Don't choose it too large, as there are arrays
+ * with VSCSI_GRANT_BATCH elements allocated on the stack.
+ */
+#define VSCSI_GRANT_BATCH 16
+
+struct vscsibk_pend {
+ uint16_t rqid;
+
+ uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE];
+ uint8_t cmd_len;
+
+ uint8_t sc_data_direction;
+ uint16_t n_sg; /* real length of SG list */
+ uint16_t n_grants; /* SG pages and potentially SG list */
+ uint32_t data_len;
+ uint32_t result;
+
+ struct vscsibk_info *info;
+ struct v2p_entry *v2p;
+ struct scatterlist *sgl;
+
+ uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE];
+
+ grant_handle_t grant_handles[VSCSI_MAX_GRANTS];
+ struct page *pages[VSCSI_MAX_GRANTS];
+
+ struct se_cmd se_cmd;
+};
+
+struct scsiback_tmr {
+ atomic_t tmr_complete;
+ wait_queue_head_t tmr_wait;
+};
+
+struct scsiback_nexus {
+ /* Pointer to TCM session for I_T Nexus */
+ struct se_session *tvn_se_sess;
+};
+
+struct scsiback_tport {
+ /* SCSI protocol the tport is providing */
+ u8 tport_proto_id;
+ /* Binary World Wide unique Port Name for pvscsi Target port */
+ u64 tport_wwpn;
+ /* ASCII formatted WWPN for pvscsi Target port */
+ char tport_name[VSCSI_NAMELEN];
+ /* Returned by scsiback_make_tport() */
+ struct se_wwn tport_wwn;
+};
+
+struct scsiback_tpg {
+ /* scsiback port target portal group tag for TCM */
+ u16 tport_tpgt;
+ /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */
+ int tv_tpg_port_count;
+ /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */
+ int tv_tpg_fe_count;
+ /* list for scsiback_list */
+ struct list_head tv_tpg_list;
+ /* Used to protect access for tpg_nexus */
+ struct mutex tv_tpg_mutex;
+ /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */
+ struct scsiback_nexus *tpg_nexus;
+ /* Pointer back to scsiback_tport */
+ struct scsiback_tport *tport;
+ /* Returned by scsiback_make_tpg() */
+ struct se_portal_group se_tpg;
+ /* alias used in xenstore */
+ char param_alias[VSCSI_NAMELEN];
+ /* list of info structures related to this target portal group */
+ struct list_head info_list;
+};
+
+#define SCSIBACK_INVALID_HANDLE (~0)
+
+static bool log_print_stat;
+module_param(log_print_stat, bool, 0644);
+
+static int scsiback_max_buffer_pages = 1024;
+module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644);
+MODULE_PARM_DESC(max_buffer_pages,
+"Maximum number of free pages to keep in backend buffer");
+
+static struct kmem_cache *scsiback_cachep;
+static DEFINE_SPINLOCK(free_pages_lock);
+static int free_pages_num;
+static LIST_HEAD(scsiback_free_pages);
+
+/* Global spinlock to protect scsiback TPG list */
+static DEFINE_MUTEX(scsiback_mutex);
+static LIST_HEAD(scsiback_list);
+
+/* Local pointer to allocated TCM configfs fabric module */
+static struct target_fabric_configfs *scsiback_fabric_configfs;
+
+static void scsiback_get(struct vscsibk_info *info)
+{
+ atomic_inc(&info->nr_unreplied_reqs);
+}
+
+static void scsiback_put(struct vscsibk_info *info)
+{
+ if (atomic_dec_and_test(&info->nr_unreplied_reqs))
+ wake_up(&info->waiting_to_free);
+}
+
+static void put_free_pages(struct page **page, int num)
+{
+ unsigned long flags;
+ int i = free_pages_num + num, n = num;
+
+ if (num == 0)
+ return;
+ if (i > scsiback_max_buffer_pages) {
+ n = min(num, i - scsiback_max_buffer_pages);
+ free_xenballooned_pages(n, page + num - n);
+ n = num - n;
+ }
+ spin_lock_irqsave(&free_pages_lock, flags);
+ for (i = 0; i < n; i++)
+ list_add(&page[i]->lru, &scsiback_free_pages);
+ free_pages_num += n;
+ spin_unlock_irqrestore(&free_pages_lock, flags);
+}
+
+static int get_free_page(struct page **page)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&free_pages_lock, flags);
+ if (list_empty(&scsiback_free_pages)) {
+ spin_unlock_irqrestore(&free_pages_lock, flags);
+ return alloc_xenballooned_pages(1, page, false);
+ }
+ page[0] = list_first_entry(&scsiback_free_pages, struct page, lru);
+ list_del(&page[0]->lru);
+ free_pages_num--;
+ spin_unlock_irqrestore(&free_pages_lock, flags);
+ return 0;
+}
+
+static unsigned long vaddr_page(struct page *page)
+{
+ unsigned long pfn = page_to_pfn(page);
+
+ return (unsigned long)pfn_to_kaddr(pfn);
+}
+
+static unsigned long vaddr(struct vscsibk_pend *req, int seg)
+{
+ return vaddr_page(req->pages[seg]);
+}
+
+static void scsiback_print_status(char *sense_buffer, int errors,
+ struct vscsibk_pend *pending_req)
+{
+ struct scsiback_tpg *tpg = pending_req->v2p->tpg;
+
+ pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
+ tpg->tport->tport_name, pending_req->v2p->lun,
+ pending_req->cmnd[0], status_byte(errors), msg_byte(errors),
+ host_byte(errors), driver_byte(errors));
+
+ if (CHECK_CONDITION & status_byte(errors))
+ __scsi_print_sense("xen-pvscsi", sense_buffer,
+ SCSI_SENSE_BUFFERSIZE);
+}
+
+static void scsiback_fast_flush_area(struct vscsibk_pend *req)
+{
+ struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH];
+ struct page *pages[VSCSI_GRANT_BATCH];
+ unsigned int i, invcount = 0;
+ grant_handle_t handle;
+ int err;
+
+ kfree(req->sgl);
+ req->sgl = NULL;
+ req->n_sg = 0;
+
+ if (!req->n_grants)
+ return;
+
+ for (i = 0; i < req->n_grants; i++) {
+ handle = req->grant_handles[i];
+ if (handle == SCSIBACK_INVALID_HANDLE)
+ continue;
+ gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i),
+ GNTMAP_host_map, handle);
+ req->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
+ pages[invcount] = req->pages[i];
+ put_page(pages[invcount]);
+ invcount++;
+ if (invcount < VSCSI_GRANT_BATCH)
+ continue;
+ err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
+ BUG_ON(err);
+ invcount = 0;
+ }
+
+ if (invcount) {
+ err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
+ BUG_ON(err);
+ }
+
+ put_free_pages(req->pages, req->n_grants);
+ req->n_grants = 0;
+}
+
+static void scsiback_free_translation_entry(struct kref *kref)
+{
+ struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref);
+ struct scsiback_tpg *tpg = entry->tpg;
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tpg->tv_tpg_fe_count--;
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ kfree(entry);
+}
+
+static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result,
+ uint32_t resid, struct vscsibk_pend *pending_req)
+{
+ struct vscsiif_response *ring_res;
+ struct vscsibk_info *info = pending_req->info;
+ int notify;
+ struct scsi_sense_hdr sshdr;
+ unsigned long flags;
+ unsigned len;
+
+ spin_lock_irqsave(&info->ring_lock, flags);
+
+ ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt);
+ info->ring.rsp_prod_pvt++;
+
+ ring_res->rslt = result;
+ ring_res->rqid = pending_req->rqid;
+
+ if (sense_buffer != NULL &&
+ scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE,
+ &sshdr)) {
+ len = min_t(unsigned, 8 + sense_buffer[7],
+ VSCSIIF_SENSE_BUFFERSIZE);
+ memcpy(ring_res->sense_buffer, sense_buffer, len);
+ ring_res->sense_len = len;
+ } else {
+ ring_res->sense_len = 0;
+ }
+
+ ring_res->residual_len = resid;
+
+ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify);
+ spin_unlock_irqrestore(&info->ring_lock, flags);
+
+ if (notify)
+ notify_remote_via_irq(info->irq);
+
+ if (pending_req->v2p)
+ kref_put(&pending_req->v2p->kref,
+ scsiback_free_translation_entry);
+}
+
+static void scsiback_cmd_done(struct vscsibk_pend *pending_req)
+{
+ struct vscsibk_info *info = pending_req->info;
+ unsigned char *sense_buffer;
+ unsigned int resid;
+ int errors;
+
+ sense_buffer = pending_req->sense_buffer;
+ resid = pending_req->se_cmd.residual_count;
+ errors = pending_req->result;
+
+ if (errors && log_print_stat)
+ scsiback_print_status(sense_buffer, errors, pending_req);
+
+ scsiback_fast_flush_area(pending_req);
+ scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req);
+ scsiback_put(info);
+}
+
+static void scsiback_cmd_exec(struct vscsibk_pend *pending_req)
+{
+ struct se_cmd *se_cmd = &pending_req->se_cmd;
+ struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess;
+ int rc;
+
+ memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE);
+
+ memset(se_cmd, 0, sizeof(*se_cmd));
+
+ scsiback_get(pending_req->info);
+ rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd,
+ pending_req->sense_buffer, pending_req->v2p->lun,
+ pending_req->data_len, 0,
+ pending_req->sc_data_direction, 0,
+ pending_req->sgl, pending_req->n_sg,
+ NULL, 0, NULL, 0);
+ if (rc < 0) {
+ transport_send_check_condition_and_sense(se_cmd,
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
+ transport_generic_free_cmd(se_cmd, 0);
+ }
+}
+
+static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,
+ struct page **pg, grant_handle_t *grant, int cnt)
+{
+ int err, i;
+
+ if (!cnt)
+ return 0;
+
+ err = gnttab_map_refs(map, NULL, pg, cnt);
+ BUG_ON(err);
+ for (i = 0; i < cnt; i++) {
+ if (unlikely(map[i].status != GNTST_okay)) {
+ pr_err("xen-pvscsi: invalid buffer -- could not remap it\n");
+ map[i].handle = SCSIBACK_INVALID_HANDLE;
+ err = -ENOMEM;
+ } else {
+ get_page(pg[i]);
+ }
+ grant[i] = map[i].handle;
+ }
+ return err;
+}
+
+static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req,
+ struct scsiif_request_segment *seg, struct page **pg,
+ grant_handle_t *grant, int cnt, u32 flags)
+{
+ int mapcount = 0, i, err = 0;
+ struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH];
+ struct vscsibk_info *info = pending_req->info;
+
+ for (i = 0; i < cnt; i++) {
+ if (get_free_page(pg + mapcount)) {
+ put_free_pages(pg, mapcount);
+ pr_err("xen-pvscsi: no grant page\n");
+ return -ENOMEM;
+ }
+ gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]),
+ flags, seg[i].gref, info->domid);
+ mapcount++;
+ if (mapcount < VSCSI_GRANT_BATCH)
+ continue;
+ err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
+ pg += mapcount;
+ grant += mapcount;
+ pending_req->n_grants += mapcount;
+ if (err)
+ return err;
+ mapcount = 0;
+ }
+ err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
+ pending_req->n_grants += mapcount;
+ return err;
+}
+
+static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
+ struct vscsibk_pend *pending_req)
+{
+ u32 flags;
+ int i, err, n_segs, i_seg = 0;
+ struct page **pg;
+ struct scsiif_request_segment *seg;
+ unsigned long end_seg = 0;
+ unsigned int nr_segments = (unsigned int)ring_req->nr_segments;
+ unsigned int nr_sgl = 0;
+ struct scatterlist *sg;
+ grant_handle_t *grant;
+
+ pending_req->n_sg = 0;
+ pending_req->n_grants = 0;
+ pending_req->data_len = 0;
+
+ nr_segments &= ~VSCSIIF_SG_GRANT;
+ if (!nr_segments)
+ return 0;
+
+ if (nr_segments > VSCSIIF_SG_TABLESIZE) {
+ DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n",
+ ring_req->nr_segments);
+ return -EINVAL;
+ }
+
+ if (ring_req->nr_segments & VSCSIIF_SG_GRANT) {
+ err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg,
+ pending_req->pages, pending_req->grant_handles,
+ nr_segments, GNTMAP_host_map | GNTMAP_readonly);
+ if (err)
+ return err;
+ nr_sgl = nr_segments;
+ nr_segments = 0;
+ for (i = 0; i < nr_sgl; i++) {
+ n_segs = ring_req->seg[i].length /
+ sizeof(struct scsiif_request_segment);
+ if ((unsigned)ring_req->seg[i].offset +
+ (unsigned)ring_req->seg[i].length > PAGE_SIZE ||
+ n_segs * sizeof(struct scsiif_request_segment) !=
+ ring_req->seg[i].length)
+ return -EINVAL;
+ nr_segments += n_segs;
+ }
+ if (nr_segments > SG_ALL) {
+ DPRINTK("xen-pvscsi: invalid nr_seg = %d\n",
+ nr_segments);
+ return -EINVAL;
+ }
+ }
+
+ /* free of (sgl) in fast_flush_area()*/
+ pending_req->sgl = kmalloc_array(nr_segments,
+ sizeof(struct scatterlist), GFP_KERNEL);
+ if (!pending_req->sgl)
+ return -ENOMEM;
+
+ sg_init_table(pending_req->sgl, nr_segments);
+ pending_req->n_sg = nr_segments;
+
+ flags = GNTMAP_host_map;
+ if (pending_req->sc_data_direction == DMA_TO_DEVICE)
+ flags |= GNTMAP_readonly;
+
+ pg = pending_req->pages + nr_sgl;
+ grant = pending_req->grant_handles + nr_sgl;
+ if (!nr_sgl) {
+ seg = ring_req->seg;
+ err = scsiback_gnttab_data_map_list(pending_req, seg,
+ pg, grant, nr_segments, flags);
+ if (err)
+ return err;
+ } else {
+ for (i = 0; i < nr_sgl; i++) {
+ seg = (struct scsiif_request_segment *)(
+ vaddr(pending_req, i) + ring_req->seg[i].offset);
+ n_segs = ring_req->seg[i].length /
+ sizeof(struct scsiif_request_segment);
+ err = scsiback_gnttab_data_map_list(pending_req, seg,
+ pg, grant, n_segs, flags);
+ if (err)
+ return err;
+ pg += n_segs;
+ grant += n_segs;
+ }
+ end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset;
+ seg = (struct scsiif_request_segment *)end_seg;
+ end_seg += ring_req->seg[0].length;
+ pg = pending_req->pages + nr_sgl;
+ }
+
+ for_each_sg(pending_req->sgl, sg, nr_segments, i) {
+ sg_set_page(sg, pg[i], seg->length, seg->offset);
+ pending_req->data_len += seg->length;
+ seg++;
+ if (nr_sgl && (unsigned long)seg >= end_seg) {
+ i_seg++;
+ end_seg = vaddr(pending_req, i_seg) +
+ ring_req->seg[i_seg].offset;
+ seg = (struct scsiif_request_segment *)end_seg;
+ end_seg += ring_req->seg[i_seg].length;
+ }
+ if (sg->offset >= PAGE_SIZE ||
+ sg->length > PAGE_SIZE ||
+ sg->offset + sg->length > PAGE_SIZE)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void scsiback_disconnect(struct vscsibk_info *info)
+{
+ wait_event(info->waiting_to_free,
+ atomic_read(&info->nr_unreplied_reqs) == 0);
+
+ unbind_from_irqhandler(info->irq, info);
+ info->irq = 0;
+ xenbus_unmap_ring_vfree(info->dev, info->ring.sring);
+}
+
+static void scsiback_device_action(struct vscsibk_pend *pending_req,
+ enum tcm_tmreq_table act, int tag)
+{
+ int rc, err = FAILED;
+ struct scsiback_tpg *tpg = pending_req->v2p->tpg;
+ struct se_cmd *se_cmd = &pending_req->se_cmd;
+ struct scsiback_tmr *tmr;
+
+ tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL);
+ if (!tmr)
+ goto out;
+
+ init_waitqueue_head(&tmr->tmr_wait);
+
+ transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo,
+ tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, MSG_SIMPLE_TAG,
+ &pending_req->sense_buffer[0]);
+
+ rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL);
+ if (rc < 0)
+ goto out;
+
+ se_cmd->se_tmr_req->ref_task_tag = tag;
+
+ if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0)
+ goto out;
+
+ transport_generic_handle_tmr(se_cmd);
+ wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete));
+
+ err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
+ SUCCESS : FAILED;
+
+out:
+ if (tmr) {
+ transport_generic_free_cmd(&pending_req->se_cmd, 1);
+ kfree(tmr);
+ }
+
+ scsiback_do_resp_with_sense(NULL, err, 0, pending_req);
+
+ kmem_cache_free(scsiback_cachep, pending_req);
+}
+
+/*
+ Perform virtual to physical translation
+*/
+static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info,
+ struct ids_tuple *v)
+{
+ struct v2p_entry *entry;
+ struct list_head *head = &(info->v2p_entry_lists);
+ unsigned long flags;
+
+ spin_lock_irqsave(&info->v2p_lock, flags);
+ list_for_each_entry(entry, head, l) {
+ if ((entry->v.chn == v->chn) &&
+ (entry->v.tgt == v->tgt) &&
+ (entry->v.lun == v->lun)) {
+ kref_get(&entry->kref);
+ goto out;
+ }
+ }
+ entry = NULL;
+
+out:
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+ return entry;
+}
+
+static int prepare_pending_reqs(struct vscsibk_info *info,
+ struct vscsiif_request *ring_req,
+ struct vscsibk_pend *pending_req)
+{
+ struct v2p_entry *v2p;
+ struct ids_tuple vir;
+
+ pending_req->rqid = ring_req->rqid;
+ pending_req->info = info;
+
+ vir.chn = ring_req->channel;
+ vir.tgt = ring_req->id;
+ vir.lun = ring_req->lun;
+
+ v2p = scsiback_do_translation(info, &vir);
+ if (!v2p) {
+ pending_req->v2p = NULL;
+ DPRINTK("xen-pvscsi: doesn't exist.\n");
+ return -ENODEV;
+ }
+ pending_req->v2p = v2p;
+
+ /* request range check from frontend */
+ pending_req->sc_data_direction = ring_req->sc_data_direction;
+ if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) &&
+ (pending_req->sc_data_direction != DMA_TO_DEVICE) &&
+ (pending_req->sc_data_direction != DMA_FROM_DEVICE) &&
+ (pending_req->sc_data_direction != DMA_NONE)) {
+ DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n",
+ pending_req->sc_data_direction);
+ return -EINVAL;
+ }
+
+ pending_req->cmd_len = ring_req->cmd_len;
+ if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
+ DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n",
+ pending_req->cmd_len);
+ return -EINVAL;
+ }
+ memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len);
+
+ return 0;
+}
+
+static int scsiback_do_cmd_fn(struct vscsibk_info *info)
+{
+ struct vscsiif_back_ring *ring = &info->ring;
+ struct vscsiif_request *ring_req;
+ struct vscsibk_pend *pending_req;
+ RING_IDX rc, rp;
+ int err, more_to_do;
+ uint32_t result;
+ uint8_t act;
+
+ rc = ring->req_cons;
+ rp = ring->sring->req_prod;
+ rmb(); /* guest system is accessing ring, too */
+
+ if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) {
+ rc = ring->rsp_prod_pvt;
+ pr_warn("xen-pvscsi: Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
+ info->domid, rp, rc, rp - rc);
+ info->ring_error = 1;
+ return 0;
+ }
+
+ while ((rc != rp)) {
+ if (RING_REQUEST_CONS_OVERFLOW(ring, rc))
+ break;
+ pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL);
+ if (!pending_req)
+ return 1;
+
+ ring_req = RING_GET_REQUEST(ring, rc);
+ ring->req_cons = ++rc;
+
+ act = ring_req->act;
+ err = prepare_pending_reqs(info, ring_req, pending_req);
+ if (err) {
+ switch (err) {
+ case -ENODEV:
+ result = DID_NO_CONNECT;
+ break;
+ default:
+ result = DRIVER_ERROR;
+ break;
+ }
+ scsiback_do_resp_with_sense(NULL, result << 24, 0,
+ pending_req);
+ kmem_cache_free(scsiback_cachep, pending_req);
+ return 1;
+ }
+
+ switch (act) {
+ case VSCSIIF_ACT_SCSI_CDB:
+ if (scsiback_gnttab_data_map(ring_req, pending_req)) {
+ scsiback_fast_flush_area(pending_req);
+ scsiback_do_resp_with_sense(NULL,
+ DRIVER_ERROR << 24, 0, pending_req);
+ kmem_cache_free(scsiback_cachep, pending_req);
+ } else {
+ scsiback_cmd_exec(pending_req);
+ }
+ break;
+ case VSCSIIF_ACT_SCSI_ABORT:
+ scsiback_device_action(pending_req, TMR_ABORT_TASK,
+ ring_req->ref_rqid);
+ break;
+ case VSCSIIF_ACT_SCSI_RESET:
+ scsiback_device_action(pending_req, TMR_LUN_RESET, 0);
+ break;
+ default:
+ pr_err_ratelimited("xen-pvscsi: invalid request\n");
+ scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24,
+ 0, pending_req);
+ kmem_cache_free(scsiback_cachep, pending_req);
+ break;
+ }
+
+ /* Yield point for this unbounded loop. */
+ cond_resched();
+ }
+
+ RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do);
+ return more_to_do;
+}
+
+static irqreturn_t scsiback_irq_fn(int irq, void *dev_id)
+{
+ struct vscsibk_info *info = dev_id;
+
+ if (info->ring_error)
+ return IRQ_HANDLED;
+
+ while (scsiback_do_cmd_fn(info))
+ cond_resched();
+
+ return IRQ_HANDLED;
+}
+
+static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref,
+ evtchn_port_t evtchn)
+{
+ void *area;
+ struct vscsiif_sring *sring;
+ int err;
+
+ if (info->irq)
+ return -1;
+
+ err = xenbus_map_ring_valloc(info->dev, ring_ref, &area);
+ if (err)
+ return err;
+
+ sring = (struct vscsiif_sring *)area;
+ BACK_RING_INIT(&info->ring, sring, PAGE_SIZE);
+
+ err = bind_interdomain_evtchn_to_irq(info->domid, evtchn);
+ if (err < 0)
+ goto unmap_page;
+
+ info->irq = err;
+
+ err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn,
+ IRQF_ONESHOT, "vscsiif-backend", info);
+ if (err)
+ goto free_irq;
+
+ return 0;
+
+free_irq:
+ unbind_from_irqhandler(info->irq, info);
+ info->irq = 0;
+unmap_page:
+ xenbus_unmap_ring_vfree(info->dev, area);
+
+ return err;
+}
+
+static int scsiback_map(struct vscsibk_info *info)
+{
+ struct xenbus_device *dev = info->dev;
+ unsigned int ring_ref, evtchn;
+ int err;
+
+ err = xenbus_gather(XBT_NIL, dev->otherend,
+ "ring-ref", "%u", &ring_ref,
+ "event-channel", "%u", &evtchn, NULL);
+ if (err) {
+ xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend);
+ return err;
+ }
+
+ return scsiback_init_sring(info, ring_ref, evtchn);
+}
+
+/*
+ Add a new translation entry
+*/
+static int scsiback_add_translation_entry(struct vscsibk_info *info,
+ char *phy, struct ids_tuple *v)
+{
+ int err = 0;
+ struct v2p_entry *entry;
+ struct v2p_entry *new;
+ struct list_head *head = &(info->v2p_entry_lists);
+ unsigned long flags;
+ char *lunp;
+ unsigned int lun;
+ struct scsiback_tpg *tpg_entry, *tpg = NULL;
+ char *error = "doesn't exist";
+
+ lunp = strrchr(phy, ':');
+ if (!lunp) {
+ pr_err("xen-pvscsi: illegal format of physical device %s\n",
+ phy);
+ return -EINVAL;
+ }
+ *lunp = 0;
+ lunp++;
+ if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
+ pr_err("xen-pvscsi: lun number not valid: %s\n", lunp);
+ return -EINVAL;
+ }
+
+ mutex_lock(&scsiback_mutex);
+ list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) {
+ if (!strcmp(phy, tpg_entry->tport->tport_name) ||
+ !strcmp(phy, tpg_entry->param_alias)) {
+ spin_lock(&tpg_entry->se_tpg.tpg_lun_lock);
+ if (tpg_entry->se_tpg.tpg_lun_list[lun]->lun_status ==
+ TRANSPORT_LUN_STATUS_ACTIVE) {
+ if (!tpg_entry->tpg_nexus)
+ error = "nexus undefined";
+ else
+ tpg = tpg_entry;
+ }
+ spin_unlock(&tpg_entry->se_tpg.tpg_lun_lock);
+ break;
+ }
+ }
+ if (tpg) {
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tpg->tv_tpg_fe_count++;
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ }
+ mutex_unlock(&scsiback_mutex);
+
+ if (!tpg) {
+ pr_err("xen-pvscsi: %s:%d %s\n", phy, lun, error);
+ return -ENODEV;
+ }
+
+ new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL);
+ if (new == NULL) {
+ err = -ENOMEM;
+ goto out_free;
+ }
+
+ spin_lock_irqsave(&info->v2p_lock, flags);
+
+ /* Check double assignment to identical virtual ID */
+ list_for_each_entry(entry, head, l) {
+ if ((entry->v.chn == v->chn) &&
+ (entry->v.tgt == v->tgt) &&
+ (entry->v.lun == v->lun)) {
+ pr_warn("xen-pvscsi: Virtual ID is already used. Assignment was not performed.\n");
+ err = -EEXIST;
+ goto out;
+ }
+
+ }
+
+ /* Create a new translation entry and add to the list */
+ kref_init(&new->kref);
+ new->v = *v;
+ new->tpg = tpg;
+ new->lun = lun;
+ list_add_tail(&new->l, head);
+
+out:
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+
+out_free:
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tpg->tv_tpg_fe_count--;
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ if (err)
+ kfree(new);
+
+ return err;
+}
+
+static void __scsiback_del_translation_entry(struct v2p_entry *entry)
+{
+ list_del(&entry->l);
+ kref_put(&entry->kref, scsiback_free_translation_entry);
+}
+
+/*
+ Delete the translation entry specfied
+*/
+static int scsiback_del_translation_entry(struct vscsibk_info *info,
+ struct ids_tuple *v)
+{
+ struct v2p_entry *entry;
+ struct list_head *head = &(info->v2p_entry_lists);
+ unsigned long flags;
+
+ spin_lock_irqsave(&info->v2p_lock, flags);
+ /* Find out the translation entry specified */
+ list_for_each_entry(entry, head, l) {
+ if ((entry->v.chn == v->chn) &&
+ (entry->v.tgt == v->tgt) &&
+ (entry->v.lun == v->lun)) {
+ goto found;
+ }
+ }
+
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+ return 1;
+
+found:
+ /* Delete the translation entry specfied */
+ __scsiback_del_translation_entry(entry);
+
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+ return 0;
+}
+
+static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
+ char *phy, struct ids_tuple *vir)
+{
+ if (!scsiback_add_translation_entry(info, phy, vir)) {
+ if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
+ "%d", XenbusStateInitialised)) {
+ pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
+ scsiback_del_translation_entry(info, vir);
+ }
+ } else {
+ xenbus_printf(XBT_NIL, info->dev->nodename, state,
+ "%d", XenbusStateClosed);
+ }
+}
+
+static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state,
+ struct ids_tuple *vir)
+{
+ if (!scsiback_del_translation_entry(info, vir)) {
+ if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
+ "%d", XenbusStateClosed))
+ pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
+ }
+}
+
+#define VSCSIBACK_OP_ADD_OR_DEL_LUN 1
+#define VSCSIBACK_OP_UPDATEDEV_STATE 2
+
+static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
+ char *ent)
+{
+ int err;
+ struct ids_tuple vir;
+ char *val;
+ int device_state;
+ char phy[VSCSI_NAMELEN];
+ char str[64];
+ char state[64];
+ struct xenbus_device *dev = info->dev;
+
+ /* read status */
+ snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent);
+ err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state);
+ if (XENBUS_EXIST_ERR(err))
+ return;
+
+ /* physical SCSI device */
+ snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent);
+ val = xenbus_read(XBT_NIL, dev->nodename, str, NULL);
+ if (IS_ERR(val)) {
+ xenbus_printf(XBT_NIL, dev->nodename, state,
+ "%d", XenbusStateClosed);
+ return;
+ }
+ strlcpy(phy, val, VSCSI_NAMELEN);
+ kfree(val);
+
+ /* virtual SCSI device */
+ snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent);
+ err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u",
+ &vir.hst, &vir.chn, &vir.tgt, &vir.lun);
+ if (XENBUS_EXIST_ERR(err)) {
+ xenbus_printf(XBT_NIL, dev->nodename, state,
+ "%d", XenbusStateClosed);
+ return;
+ }
+
+ switch (op) {
+ case VSCSIBACK_OP_ADD_OR_DEL_LUN:
+ if (device_state == XenbusStateInitialising)
+ scsiback_do_add_lun(info, state, phy, &vir);
+ if (device_state == XenbusStateClosing)
+ scsiback_do_del_lun(info, state, &vir);
+ break;
+
+ case VSCSIBACK_OP_UPDATEDEV_STATE:
+ if (device_state == XenbusStateInitialised) {
+ /* modify vscsi-devs/dev-x/state */
+ if (xenbus_printf(XBT_NIL, dev->nodename, state,
+ "%d", XenbusStateConnected)) {
+ pr_err("xen-pvscsi: xenbus_printf error %s\n",
+ str);
+ scsiback_del_translation_entry(info, &vir);
+ xenbus_printf(XBT_NIL, dev->nodename, state,
+ "%d", XenbusStateClosed);
+ }
+ }
+ break;
+ /*When it is necessary, processing is added here.*/
+ default:
+ break;
+ }
+}
+
+static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op)
+{
+ int i;
+ char **dir;
+ unsigned int ndir = 0;
+
+ dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs",
+ &ndir);
+ if (IS_ERR(dir))
+ return;
+
+ for (i = 0; i < ndir; i++)
+ scsiback_do_1lun_hotplug(info, op, dir[i]);
+
+ kfree(dir);
+}
+
+static void scsiback_frontend_changed(struct xenbus_device *dev,
+ enum xenbus_state frontend_state)
+{
+ struct vscsibk_info *info = dev_get_drvdata(&dev->dev);
+
+ switch (frontend_state) {
+ case XenbusStateInitialising:
+ break;
+
+ case XenbusStateInitialised:
+ if (scsiback_map(info))
+ break;
+
+ scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN);
+ xenbus_switch_state(dev, XenbusStateConnected);
+ break;
+
+ case XenbusStateConnected:
+ scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE);
+
+ if (dev->state == XenbusStateConnected)
+ break;
+
+ xenbus_switch_state(dev, XenbusStateConnected);
+ break;
+
+ case XenbusStateClosing:
+ if (info->irq)
+ scsiback_disconnect(info);
+
+ xenbus_switch_state(dev, XenbusStateClosing);
+ break;
+
+ case XenbusStateClosed:
+ xenbus_switch_state(dev, XenbusStateClosed);
+ if (xenbus_dev_is_online(dev))
+ break;
+ /* fall through if not online */
+ case XenbusStateUnknown:
+ device_unregister(&dev->dev);
+ break;
+
+ case XenbusStateReconfiguring:
+ scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN);
+ xenbus_switch_state(dev, XenbusStateReconfigured);
+
+ break;
+
+ default:
+ xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
+ frontend_state);
+ break;
+ }
+}
+
+/*
+ Release the translation entry specfied
+*/
+static void scsiback_release_translation_entry(struct vscsibk_info *info)
+{
+ struct v2p_entry *entry, *tmp;
+ struct list_head *head = &(info->v2p_entry_lists);
+ unsigned long flags;
+
+ spin_lock_irqsave(&info->v2p_lock, flags);
+
+ list_for_each_entry_safe(entry, tmp, head, l)
+ __scsiback_del_translation_entry(entry);
+
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+}
+
+static int scsiback_remove(struct xenbus_device *dev)
+{
+ struct vscsibk_info *info = dev_get_drvdata(&dev->dev);
+
+ if (info->irq)
+ scsiback_disconnect(info);
+
+ scsiback_release_translation_entry(info);
+
+ dev_set_drvdata(&dev->dev, NULL);
+
+ return 0;
+}
+
+static int scsiback_probe(struct xenbus_device *dev,
+ const struct xenbus_device_id *id)
+{
+ int err;
+
+ struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info),
+ GFP_KERNEL);
+
+ DPRINTK("%p %d\n", dev, dev->otherend_id);
+
+ if (!info) {
+ xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure");
+ return -ENOMEM;
+ }
+ info->dev = dev;
+ dev_set_drvdata(&dev->dev, info);
+
+ info->domid = dev->otherend_id;
+ spin_lock_init(&info->ring_lock);
+ info->ring_error = 0;
+ atomic_set(&info->nr_unreplied_reqs, 0);
+ init_waitqueue_head(&info->waiting_to_free);
+ info->dev = dev;
+ info->irq = 0;
+ INIT_LIST_HEAD(&info->v2p_entry_lists);
+ spin_lock_init(&info->v2p_lock);
+
+ err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u",
+ SG_ALL);
+ if (err)
+ xenbus_dev_error(dev, err, "writing feature-sg-grant");
+
+ err = xenbus_switch_state(dev, XenbusStateInitWait);
+ if (err)
+ goto fail;
+
+ return 0;
+
+fail:
+ pr_warn("xen-pvscsi: %s failed\n", __func__);
+ scsiback_remove(dev);
+
+ return err;
+}
+
+static char *scsiback_dump_proto_id(struct scsiback_tport *tport)
+{
+ switch (tport->tport_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ return "SAS";
+ case SCSI_PROTOCOL_FCP:
+ return "FCP";
+ case SCSI_PROTOCOL_ISCSI:
+ return "iSCSI";
+ default:
+ break;
+ }
+
+ return "Unknown";
+}
+
+static u8 scsiback_get_fabric_proto_ident(struct se_portal_group *se_tpg)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+ struct scsiback_tport *tport = tpg->tport;
+
+ switch (tport->tport_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ return sas_get_fabric_proto_ident(se_tpg);
+ case SCSI_PROTOCOL_FCP:
+ return fc_get_fabric_proto_ident(se_tpg);
+ case SCSI_PROTOCOL_ISCSI:
+ return iscsi_get_fabric_proto_ident(se_tpg);
+ default:
+ pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
+ tport->tport_proto_id);
+ break;
+ }
+
+ return sas_get_fabric_proto_ident(se_tpg);
+}
+
+static char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+ struct scsiback_tport *tport = tpg->tport;
+
+ return &tport->tport_name[0];
+}
+
+static u16 scsiback_get_tag(struct se_portal_group *se_tpg)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+ return tpg->tport_tpgt;
+}
+
+static u32 scsiback_get_default_depth(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static u32
+scsiback_get_pr_transport_id(struct se_portal_group *se_tpg,
+ struct se_node_acl *se_nacl,
+ struct t10_pr_registration *pr_reg,
+ int *format_code,
+ unsigned char *buf)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+ struct scsiback_tport *tport = tpg->tport;
+
+ switch (tport->tport_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
+ format_code, buf);
+ case SCSI_PROTOCOL_FCP:
+ return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
+ format_code, buf);
+ case SCSI_PROTOCOL_ISCSI:
+ return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
+ format_code, buf);
+ default:
+ pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
+ tport->tport_proto_id);
+ break;
+ }
+
+ return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
+ format_code, buf);
+}
+
+static u32
+scsiback_get_pr_transport_id_len(struct se_portal_group *se_tpg,
+ struct se_node_acl *se_nacl,
+ struct t10_pr_registration *pr_reg,
+ int *format_code)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+ struct scsiback_tport *tport = tpg->tport;
+
+ switch (tport->tport_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
+ format_code);
+ case SCSI_PROTOCOL_FCP:
+ return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
+ format_code);
+ case SCSI_PROTOCOL_ISCSI:
+ return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
+ format_code);
+ default:
+ pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
+ tport->tport_proto_id);
+ break;
+ }
+
+ return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
+ format_code);
+}
+
+static char *
+scsiback_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
+ const char *buf,
+ u32 *out_tid_len,
+ char **port_nexus_ptr)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+ struct scsiback_tport *tport = tpg->tport;
+
+ switch (tport->tport_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
+ port_nexus_ptr);
+ case SCSI_PROTOCOL_FCP:
+ return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
+ port_nexus_ptr);
+ case SCSI_PROTOCOL_ISCSI:
+ return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
+ port_nexus_ptr);
+ default:
+ pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
+ tport->tport_proto_id);
+ break;
+ }
+
+ return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
+ port_nexus_ptr);
+}
+
+static struct se_wwn *
+scsiback_make_tport(struct target_fabric_configfs *tf,
+ struct config_group *group,
+ const char *name)
+{
+ struct scsiback_tport *tport;
+ char *ptr;
+ u64 wwpn = 0;
+ int off = 0;
+
+ tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL);
+ if (!tport)
+ return ERR_PTR(-ENOMEM);
+
+ tport->tport_wwpn = wwpn;
+ /*
+ * Determine the emulated Protocol Identifier and Target Port Name
+ * based on the incoming configfs directory name.
+ */
+ ptr = strstr(name, "naa.");
+ if (ptr) {
+ tport->tport_proto_id = SCSI_PROTOCOL_SAS;
+ goto check_len;
+ }
+ ptr = strstr(name, "fc.");
+ if (ptr) {
+ tport->tport_proto_id = SCSI_PROTOCOL_FCP;
+ off = 3; /* Skip over "fc." */
+ goto check_len;
+ }
+ ptr = strstr(name, "iqn.");
+ if (ptr) {
+ tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
+ goto check_len;
+ }
+
+ pr_err("Unable to locate prefix for emulated Target Port: %s\n", name);
+ kfree(tport);
+ return ERR_PTR(-EINVAL);
+
+check_len:
+ if (strlen(name) >= VSCSI_NAMELEN) {
+ pr_err("Emulated %s Address: %s, exceeds max: %d\n", name,
+ scsiback_dump_proto_id(tport), VSCSI_NAMELEN);
+ kfree(tport);
+ return ERR_PTR(-EINVAL);
+ }
+ snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]);
+
+ pr_debug("xen-pvscsi: Allocated emulated Target %s Address: %s\n",
+ scsiback_dump_proto_id(tport), name);
+
+ return &tport->tport_wwn;
+}
+
+static void scsiback_drop_tport(struct se_wwn *wwn)
+{
+ struct scsiback_tport *tport = container_of(wwn,
+ struct scsiback_tport, tport_wwn);
+
+ pr_debug("xen-pvscsi: Deallocating emulated Target %s Address: %s\n",
+ scsiback_dump_proto_id(tport), tport->tport_name);
+
+ kfree(tport);
+}
+
+static struct se_node_acl *
+scsiback_alloc_fabric_acl(struct se_portal_group *se_tpg)
+{
+ return kzalloc(sizeof(struct se_node_acl), GFP_KERNEL);
+}
+
+static void
+scsiback_release_fabric_acl(struct se_portal_group *se_tpg,
+ struct se_node_acl *se_nacl)
+{
+ kfree(se_nacl);
+}
+
+static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static int scsiback_check_stop_free(struct se_cmd *se_cmd)
+{
+ /*
+ * Do not release struct se_cmd's containing a valid TMR
+ * pointer. These will be released directly in scsiback_device_action()
+ * with transport_generic_free_cmd().
+ */
+ if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
+ return 0;
+
+ transport_generic_free_cmd(se_cmd, 0);
+ return 1;
+}
+
+static void scsiback_release_cmd(struct se_cmd *se_cmd)
+{
+ struct vscsibk_pend *pending_req = container_of(se_cmd,
+ struct vscsibk_pend, se_cmd);
+
+ kmem_cache_free(scsiback_cachep, pending_req);
+}
+
+static int scsiback_shutdown_session(struct se_session *se_sess)
+{
+ return 0;
+}
+
+static void scsiback_close_session(struct se_session *se_sess)
+{
+}
+
+static u32 scsiback_sess_get_index(struct se_session *se_sess)
+{
+ return 0;
+}
+
+static int scsiback_write_pending(struct se_cmd *se_cmd)
+{
+ /* Go ahead and process the write immediately */
+ target_execute_cmd(se_cmd);
+
+ return 0;
+}
+
+static int scsiback_write_pending_status(struct se_cmd *se_cmd)
+{
+ return 0;
+}
+
+static void scsiback_set_default_node_attrs(struct se_node_acl *nacl)
+{
+}
+
+static u32 scsiback_get_task_tag(struct se_cmd *se_cmd)
+{
+ struct vscsibk_pend *pending_req = container_of(se_cmd,
+ struct vscsibk_pend, se_cmd);
+
+ return pending_req->rqid;
+}
+
+static int scsiback_get_cmd_state(struct se_cmd *se_cmd)
+{
+ return 0;
+}
+
+static int scsiback_queue_data_in(struct se_cmd *se_cmd)
+{
+ struct vscsibk_pend *pending_req = container_of(se_cmd,
+ struct vscsibk_pend, se_cmd);
+
+ pending_req->result = SAM_STAT_GOOD;
+ scsiback_cmd_done(pending_req);
+ return 0;
+}
+
+static int scsiback_queue_status(struct se_cmd *se_cmd)
+{
+ struct vscsibk_pend *pending_req = container_of(se_cmd,
+ struct vscsibk_pend, se_cmd);
+
+ if (se_cmd->sense_buffer &&
+ ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
+ (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE)))
+ pending_req->result = (DRIVER_SENSE << 24) |
+ SAM_STAT_CHECK_CONDITION;
+ else
+ pending_req->result = se_cmd->scsi_status;
+
+ scsiback_cmd_done(pending_req);
+ return 0;
+}
+
+static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd)
+{
+ struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
+ struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr;
+
+ atomic_set(&tmr->tmr_complete, 1);
+ wake_up(&tmr->tmr_wait);
+}
+
+static void scsiback_aborted_task(struct se_cmd *se_cmd)
+{
+}
+
+static ssize_t scsiback_tpg_param_show_alias(struct se_portal_group *se_tpg,
+ char *page)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg,
+ se_tpg);
+ ssize_t rb;
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias);
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ return rb;
+}
+
+static ssize_t scsiback_tpg_param_store_alias(struct se_portal_group *se_tpg,
+ const char *page, size_t count)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg,
+ se_tpg);
+ int len;
+
+ if (strlen(page) >= VSCSI_NAMELEN) {
+ pr_err("param alias: %s, exceeds max: %d\n", page,
+ VSCSI_NAMELEN);
+ return -EINVAL;
+ }
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page);
+ if (tpg->param_alias[len - 1] == '\n')
+ tpg->param_alias[len - 1] = '\0';
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ return count;
+}
+
+TF_TPG_PARAM_ATTR(scsiback, alias, S_IRUGO | S_IWUSR);
+
+static struct configfs_attribute *scsiback_param_attrs[] = {
+ &scsiback_tpg_param_alias.attr,
+ NULL,
+};
+
+static int scsiback_make_nexus(struct scsiback_tpg *tpg,
+ const char *name)
+{
+ struct se_portal_group *se_tpg;
+ struct se_session *se_sess;
+ struct scsiback_nexus *tv_nexus;
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ if (tpg->tpg_nexus) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ pr_debug("tpg->tpg_nexus already exists\n");
+ return -EEXIST;
+ }
+ se_tpg = &tpg->se_tpg;
+
+ tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL);
+ if (!tv_nexus) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ return -ENOMEM;
+ }
+ /*
+ * Initialize the struct se_session pointer
+ */
+ tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
+ if (IS_ERR(tv_nexus->tvn_se_sess)) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ kfree(tv_nexus);
+ return -ENOMEM;
+ }
+ se_sess = tv_nexus->tvn_se_sess;
+ /*
+ * Since we are running in 'demo mode' this call with generate a
+ * struct se_node_acl for the scsiback struct se_portal_group with
+ * the SCSI Initiator port name of the passed configfs group 'name'.
+ */
+ tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
+ se_tpg, (unsigned char *)name);
+ if (!tv_nexus->tvn_se_sess->se_node_acl) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ pr_debug("core_tpg_check_initiator_node_acl() failed for %s\n",
+ name);
+ goto out;
+ }
+ /*
+ * Now register the TCM pvscsi virtual I_T Nexus as active with the
+ * call to __transport_register_session()
+ */
+ __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
+ tv_nexus->tvn_se_sess, tv_nexus);
+ tpg->tpg_nexus = tv_nexus;
+
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ return 0;
+
+out:
+ transport_free_session(se_sess);
+ kfree(tv_nexus);
+ return -ENOMEM;
+}
+
+static int scsiback_drop_nexus(struct scsiback_tpg *tpg)
+{
+ struct se_session *se_sess;
+ struct scsiback_nexus *tv_nexus;
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tv_nexus = tpg->tpg_nexus;
+ if (!tv_nexus) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ return -ENODEV;
+ }
+
+ se_sess = tv_nexus->tvn_se_sess;
+ if (!se_sess) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ return -ENODEV;
+ }
+
+ if (tpg->tv_tpg_port_count != 0) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n",
+ tpg->tv_tpg_port_count);
+ return -EBUSY;
+ }
+
+ if (tpg->tv_tpg_fe_count != 0) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n",
+ tpg->tv_tpg_fe_count);
+ return -EBUSY;
+ }
+
+ pr_debug("xen-pvscsi: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
+ scsiback_dump_proto_id(tpg->tport),
+ tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
+
+ /*
+ * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port
+ */
+ transport_deregister_session(tv_nexus->tvn_se_sess);
+ tpg->tpg_nexus = NULL;
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ kfree(tv_nexus);
+ return 0;
+}
+
+static ssize_t scsiback_tpg_show_nexus(struct se_portal_group *se_tpg,
+ char *page)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+ struct scsiback_nexus *tv_nexus;
+ ssize_t ret;
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tv_nexus = tpg->tpg_nexus;
+ if (!tv_nexus) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ return -ENODEV;
+ }
+ ret = snprintf(page, PAGE_SIZE, "%s\n",
+ tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ return ret;
+}
+
+static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg,
+ const char *page,
+ size_t count)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+ struct scsiback_tport *tport_wwn = tpg->tport;
+ unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr;
+ int ret;
+ /*
+ * Shutdown the active I_T nexus if 'NULL' is passed..
+ */
+ if (!strncmp(page, "NULL", 4)) {
+ ret = scsiback_drop_nexus(tpg);
+ return (!ret) ? count : ret;
+ }
+ /*
+ * Otherwise make sure the passed virtual Initiator port WWN matches
+ * the fabric protocol_id set in scsiback_make_tport(), and call
+ * scsiback_make_nexus().
+ */
+ if (strlen(page) >= VSCSI_NAMELEN) {
+ pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
+ page, VSCSI_NAMELEN);
+ return -EINVAL;
+ }
+ snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page);
+
+ ptr = strstr(i_port, "naa.");
+ if (ptr) {
+ if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
+ pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
+ i_port, scsiback_dump_proto_id(tport_wwn));
+ return -EINVAL;
+ }
+ port_ptr = &i_port[0];
+ goto check_newline;
+ }
+ ptr = strstr(i_port, "fc.");
+ if (ptr) {
+ if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
+ pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
+ i_port, scsiback_dump_proto_id(tport_wwn));
+ return -EINVAL;
+ }
+ port_ptr = &i_port[3]; /* Skip over "fc." */
+ goto check_newline;
+ }
+ ptr = strstr(i_port, "iqn.");
+ if (ptr) {
+ if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
+ pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
+ i_port, scsiback_dump_proto_id(tport_wwn));
+ return -EINVAL;
+ }
+ port_ptr = &i_port[0];
+ goto check_newline;
+ }
+ pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
+ i_port);
+ return -EINVAL;
+ /*
+ * Clear any trailing newline for the NAA WWN
+ */
+check_newline:
+ if (i_port[strlen(i_port) - 1] == '\n')
+ i_port[strlen(i_port) - 1] = '\0';
+
+ ret = scsiback_make_nexus(tpg, port_ptr);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR);
+
+static struct configfs_attribute *scsiback_tpg_attrs[] = {
+ &scsiback_tpg_nexus.attr,
+ NULL,
+};
+
+static ssize_t
+scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf,
+ char *page)
+{
+ return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on "
+ UTS_RELEASE"\n",
+ VSCSI_VERSION, utsname()->sysname, utsname()->machine);
+}
+
+TF_WWN_ATTR_RO(scsiback, version);
+
+static struct configfs_attribute *scsiback_wwn_attrs[] = {
+ &scsiback_wwn_version.attr,
+ NULL,
+};
+
+static char *scsiback_get_fabric_name(void)
+{
+ return "xen-pvscsi";
+}
+
+static int scsiback_port_link(struct se_portal_group *se_tpg,
+ struct se_lun *lun)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tpg->tv_tpg_port_count++;
+ mutex_unlock(&tpg->tv_tpg_mutex);
+
+ return 0;
+}
+
+static void scsiback_port_unlink(struct se_portal_group *se_tpg,
+ struct se_lun *lun)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+
+ mutex_lock(&tpg->tv_tpg_mutex);
+ tpg->tv_tpg_port_count--;
+ mutex_unlock(&tpg->tv_tpg_mutex);
+}
+
+static struct se_portal_group *
+scsiback_make_tpg(struct se_wwn *wwn,
+ struct config_group *group,
+ const char *name)
+{
+ struct scsiback_tport *tport = container_of(wwn,
+ struct scsiback_tport, tport_wwn);
+
+ struct scsiback_tpg *tpg;
+ u16 tpgt;
+ int ret;
+
+ if (strstr(name, "tpgt_") != name)
+ return ERR_PTR(-EINVAL);
+ ret = kstrtou16(name + 5, 10, &tpgt);
+ if (ret)
+ return ERR_PTR(ret);
+
+ tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL);
+ if (!tpg)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_init(&tpg->tv_tpg_mutex);
+ INIT_LIST_HEAD(&tpg->tv_tpg_list);
+ INIT_LIST_HEAD(&tpg->info_list);
+ tpg->tport = tport;
+ tpg->tport_tpgt = tpgt;
+
+ ret = core_tpg_register(&scsiback_fabric_configfs->tf_ops, wwn,
+ &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
+ if (ret < 0) {
+ kfree(tpg);
+ return NULL;
+ }
+ mutex_lock(&scsiback_mutex);
+ list_add_tail(&tpg->tv_tpg_list, &scsiback_list);
+ mutex_unlock(&scsiback_mutex);
+
+ return &tpg->se_tpg;
+}
+
+static void scsiback_drop_tpg(struct se_portal_group *se_tpg)
+{
+ struct scsiback_tpg *tpg = container_of(se_tpg,
+ struct scsiback_tpg, se_tpg);
+
+ mutex_lock(&scsiback_mutex);
+ list_del(&tpg->tv_tpg_list);
+ mutex_unlock(&scsiback_mutex);
+ /*
+ * Release the virtual I_T Nexus for this xen-pvscsi TPG
+ */
+ scsiback_drop_nexus(tpg);
+ /*
+ * Deregister the se_tpg from TCM..
+ */
+ core_tpg_deregister(se_tpg);
+ kfree(tpg);
+}
+
+static int scsiback_check_true(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static int scsiback_check_false(struct se_portal_group *se_tpg)
+{
+ return 0;
+}
+
+static struct target_core_fabric_ops scsiback_ops = {
+ .get_fabric_name = scsiback_get_fabric_name,
+ .get_fabric_proto_ident = scsiback_get_fabric_proto_ident,
+ .tpg_get_wwn = scsiback_get_fabric_wwn,
+ .tpg_get_tag = scsiback_get_tag,
+ .tpg_get_default_depth = scsiback_get_default_depth,
+ .tpg_get_pr_transport_id = scsiback_get_pr_transport_id,
+ .tpg_get_pr_transport_id_len = scsiback_get_pr_transport_id_len,
+ .tpg_parse_pr_out_transport_id = scsiback_parse_pr_out_transport_id,
+ .tpg_check_demo_mode = scsiback_check_true,
+ .tpg_check_demo_mode_cache = scsiback_check_true,
+ .tpg_check_demo_mode_write_protect = scsiback_check_false,
+ .tpg_check_prod_mode_write_protect = scsiback_check_false,
+ .tpg_alloc_fabric_acl = scsiback_alloc_fabric_acl,
+ .tpg_release_fabric_acl = scsiback_release_fabric_acl,
+ .tpg_get_inst_index = scsiback_tpg_get_inst_index,
+ .check_stop_free = scsiback_check_stop_free,
+ .release_cmd = scsiback_release_cmd,
+ .put_session = NULL,
+ .shutdown_session = scsiback_shutdown_session,
+ .close_session = scsiback_close_session,
+ .sess_get_index = scsiback_sess_get_index,
+ .sess_get_initiator_sid = NULL,
+ .write_pending = scsiback_write_pending,
+ .write_pending_status = scsiback_write_pending_status,
+ .set_default_node_attributes = scsiback_set_default_node_attrs,
+ .get_task_tag = scsiback_get_task_tag,
+ .get_cmd_state = scsiback_get_cmd_state,
+ .queue_data_in = scsiback_queue_data_in,
+ .queue_status = scsiback_queue_status,
+ .queue_tm_rsp = scsiback_queue_tm_rsp,
+ .aborted_task = scsiback_aborted_task,
+ /*
+ * Setup callers for generic logic in target_core_fabric_configfs.c
+ */
+ .fabric_make_wwn = scsiback_make_tport,
+ .fabric_drop_wwn = scsiback_drop_tport,
+ .fabric_make_tpg = scsiback_make_tpg,
+ .fabric_drop_tpg = scsiback_drop_tpg,
+ .fabric_post_link = scsiback_port_link,
+ .fabric_pre_unlink = scsiback_port_unlink,
+ .fabric_make_np = NULL,
+ .fabric_drop_np = NULL,
+#if 0
+ .fabric_make_nodeacl = scsiback_make_nodeacl,
+ .fabric_drop_nodeacl = scsiback_drop_nodeacl,
+#endif
+};
+
+static int scsiback_register_configfs(void)
+{
+ struct target_fabric_configfs *fabric;
+ int ret;
+
+ pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n",
+ VSCSI_VERSION, utsname()->sysname, utsname()->machine);
+ /*
+ * Register the top level struct config_item_type with TCM core
+ */
+ fabric = target_fabric_configfs_init(THIS_MODULE, "xen-pvscsi");
+ if (IS_ERR(fabric))
+ return PTR_ERR(fabric);
+
+ /*
+ * Setup fabric->tf_ops from our local scsiback_ops
+ */
+ fabric->tf_ops = scsiback_ops;
+ /*
+ * Setup default attribute lists for various fabric->tf_cit_tmpl
+ */
+ fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = scsiback_wwn_attrs;
+ fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = scsiback_tpg_attrs;
+ fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
+ fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = scsiback_param_attrs;
+ fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
+ fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
+ fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
+ fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
+ fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
+ /*
+ * Register the fabric for use within TCM
+ */
+ ret = target_fabric_configfs_register(fabric);
+ if (ret < 0) {
+ target_fabric_configfs_free(fabric);
+ return ret;
+ }
+ /*
+ * Setup our local pointer to *fabric
+ */
+ scsiback_fabric_configfs = fabric;
+ pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n");
+ return 0;
+};
+
+static void scsiback_deregister_configfs(void)
+{
+ if (!scsiback_fabric_configfs)
+ return;
+
+ target_fabric_configfs_deregister(scsiback_fabric_configfs);
+ scsiback_fabric_configfs = NULL;
+ pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n");
+};
+
+static const struct xenbus_device_id scsiback_ids[] = {
+ { "vscsi" },
+ { "" }
+};
+
+static struct xenbus_driver scsiback_driver = {
+ .ids = scsiback_ids,
+ .probe = scsiback_probe,
+ .remove = scsiback_remove,
+ .otherend_changed = scsiback_frontend_changed
+};
+
+static void scsiback_init_pend(void *p)
+{
+ struct vscsibk_pend *pend = p;
+ int i;
+
+ memset(pend, 0, sizeof(*pend));
+ for (i = 0; i < VSCSI_MAX_GRANTS; i++)
+ pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
+}
+
+static int __init scsiback_init(void)
+{
+ int ret;
+
+ if (!xen_domain())
+ return -ENODEV;
+
+ scsiback_cachep = kmem_cache_create("vscsiif_cache",
+ sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend);
+ if (!scsiback_cachep)
+ return -ENOMEM;
+
+ ret = xenbus_register_backend(&scsiback_driver);
+ if (ret)
+ goto out_cache_destroy;
+
+ ret = scsiback_register_configfs();
+ if (ret)
+ goto out_unregister_xenbus;
+
+ return 0;
+
+out_unregister_xenbus:
+ xenbus_unregister_driver(&scsiback_driver);
+out_cache_destroy:
+ kmem_cache_destroy(scsiback_cachep);
+ pr_err("xen-pvscsi: %s: error %d\n", __func__, ret);
+ return ret;
+}
+
+static void __exit scsiback_exit(void)
+{
+ struct page *page;
+
+ while (free_pages_num) {
+ if (get_free_page(&page))
+ BUG();
+ free_xenballooned_pages(1, &page);
+ }
+ scsiback_deregister_configfs();
+ xenbus_unregister_driver(&scsiback_driver);
+ kmem_cache_destroy(scsiback_cachep);
+}
+
+module_init(scsiback_init);
+module_exit(scsiback_exit);
+
+MODULE_DESCRIPTION("Xen SCSI backend driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_ALIAS("xen-backend:vscsi");
+MODULE_AUTHOR("Juergen Gross <jgross@suse.com>");
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index 439c9dca9eee..ca744102b666 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -259,7 +259,6 @@ static char *error_path(struct xenbus_device *dev)
static void xenbus_va_dev_error(struct xenbus_device *dev, int err,
const char *fmt, va_list ap)
{
- int ret;
unsigned int len;
char *printf_buffer = NULL;
char *path_buffer = NULL;
@@ -270,9 +269,7 @@ static void xenbus_va_dev_error(struct xenbus_device *dev, int err,
goto fail;
len = sprintf(printf_buffer, "%i ", -err);
- ret = vsnprintf(printf_buffer+len, PRINTF_BUFFER_SIZE-len, fmt, ap);
-
- BUG_ON(len + ret > PRINTF_BUFFER_SIZE-1);
+ vsnprintf(printf_buffer+len, PRINTF_BUFFER_SIZE-len, fmt, ap);
dev_err(&dev->dev, "%s\n", printf_buffer);
@@ -361,8 +358,8 @@ static void xenbus_switch_fatal(struct xenbus_device *dev, int depth, int err,
* @ring_mfn: mfn of ring to grant
* Grant access to the given @ring_mfn to the peer of the given device. Return
- * 0 on success, or -errno on error. On error, the device will switch to
- * XenbusStateClosing, and the error will be saved in the store.
+ * a grant reference on success, or -errno on error. On error, the device will
+ * switch to XenbusStateClosing, and the error will be saved in the store.
*/
int xenbus_grant_ring(struct xenbus_device *dev, unsigned long ring_mfn)
{
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 3c0a74b3e9b1..564b31584860 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -297,9 +297,13 @@ void xenbus_dev_shutdown(struct device *_dev)
EXPORT_SYMBOL_GPL(xenbus_dev_shutdown);
int xenbus_register_driver_common(struct xenbus_driver *drv,
- struct xen_bus_type *bus)
+ struct xen_bus_type *bus,
+ struct module *owner, const char *mod_name)
{
+ drv->driver.name = drv->name ? drv->name : drv->ids[0].devicetype;
drv->driver.bus = &bus->bus;
+ drv->driver.owner = owner;
+ drv->driver.mod_name = mod_name;
return driver_register(&drv->driver);
}
diff --git a/drivers/xen/xenbus/xenbus_probe.h b/drivers/xen/xenbus/xenbus_probe.h
index 1085ec294a19..c9ec7ca1f7ab 100644
--- a/drivers/xen/xenbus/xenbus_probe.h
+++ b/drivers/xen/xenbus/xenbus_probe.h
@@ -60,7 +60,9 @@ extern int xenbus_match(struct device *_dev, struct device_driver *_drv);
extern int xenbus_dev_probe(struct device *_dev);
extern int xenbus_dev_remove(struct device *_dev);
extern int xenbus_register_driver_common(struct xenbus_driver *drv,
- struct xen_bus_type *bus);
+ struct xen_bus_type *bus,
+ struct module *owner,
+ const char *mod_name);
extern int xenbus_probe_node(struct xen_bus_type *bus,
const char *type,
const char *nodename);
diff --git a/drivers/xen/xenbus/xenbus_probe_backend.c b/drivers/xen/xenbus/xenbus_probe_backend.c
index 5125dce11a60..04f7f85a5edf 100644
--- a/drivers/xen/xenbus/xenbus_probe_backend.c
+++ b/drivers/xen/xenbus/xenbus_probe_backend.c
@@ -234,13 +234,15 @@ int xenbus_dev_is_online(struct xenbus_device *dev)
}
EXPORT_SYMBOL_GPL(xenbus_dev_is_online);
-int xenbus_register_backend(struct xenbus_driver *drv)
+int __xenbus_register_backend(struct xenbus_driver *drv, struct module *owner,
+ const char *mod_name)
{
drv->read_otherend_details = read_frontend_details;
- return xenbus_register_driver_common(drv, &xenbus_backend);
+ return xenbus_register_driver_common(drv, &xenbus_backend,
+ owner, mod_name);
}
-EXPORT_SYMBOL_GPL(xenbus_register_backend);
+EXPORT_SYMBOL_GPL(__xenbus_register_backend);
static int backend_probe_and_watch(struct notifier_block *notifier,
unsigned long event,
diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c b/drivers/xen/xenbus/xenbus_probe_frontend.c
index cb385c10d2b1..bcb53bdc469c 100644
--- a/drivers/xen/xenbus/xenbus_probe_frontend.c
+++ b/drivers/xen/xenbus/xenbus_probe_frontend.c
@@ -317,13 +317,15 @@ static void wait_for_devices(struct xenbus_driver *xendrv)
print_device_status);
}
-int xenbus_register_frontend(struct xenbus_driver *drv)
+int __xenbus_register_frontend(struct xenbus_driver *drv, struct module *owner,
+ const char *mod_name)
{
int ret;
drv->read_otherend_details = read_backend_details;
- ret = xenbus_register_driver_common(drv, &xenbus_frontend);
+ ret = xenbus_register_driver_common(drv, &xenbus_frontend,
+ owner, mod_name);
if (ret)
return ret;
@@ -332,7 +334,7 @@ int xenbus_register_frontend(struct xenbus_driver *drv)
return 0;
}
-EXPORT_SYMBOL_GPL(xenbus_register_frontend);
+EXPORT_SYMBOL_GPL(__xenbus_register_frontend);
static DECLARE_WAIT_QUEUE_HEAD(backend_state_wq);
static int backend_state;
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-16 15:09:46 +0300