[Xen-devel] [PATCH v4 1/2] xen: Use evtchn_type_t as a type for event channels

From: Yan Yankovskyi
Date: Mon Mar 23 2020 - 12:15:29 EST

Make event channel functions pass event channel port using
evtchn_port_t type. It eliminates signed <-> unsigned conversion.

Signed-off-by: Yan Yankovskyi <yyankovskyi@xxxxxxxxx>
---
drivers/xen/events/events_2l.c | 16 ++---
drivers/xen/events/events_base.c | 93 ++++++++++++++-------------
drivers/xen/events/events_fifo.c | 22 +++----
drivers/xen/events/events_internal.h | 30 ++++-----
drivers/xen/evtchn.c | 13 ++--
drivers/xen/gntdev-common.h | 3 +-
drivers/xen/gntdev.c | 2 +-
drivers/xen/pvcalls-back.c | 5 +-
drivers/xen/pvcalls-front.c | 15 +++--
drivers/xen/xen-pciback/xenbus.c | 7 +-
drivers/xen/xen-scsiback.c | 3 +-
drivers/xen/xenbus/xenbus_client.c | 6 +-
include/xen/events.h | 22 +++----
include/xen/interface/event_channel.h | 2 +-
include/xen/xenbus.h | 5 +-
15 files changed, 128 insertions(+), 116 deletions(-)

diff --git a/drivers/xen/events/events_2l.c b/drivers/xen/events/events_2l.c
index 8edef51c92e5..64df919a2111 100644
--- a/drivers/xen/events/events_2l.c
+++ b/drivers/xen/events/events_2l.c
@@ -53,37 +53,37 @@ static void evtchn_2l_bind_to_cpu(struct irq_info *info, unsigned cpu)
set_bit(info->evtchn, BM(per_cpu(cpu_evtchn_mask, cpu)));
}

-static void evtchn_2l_clear_pending(unsigned port)
+static void evtchn_2l_clear_pending(evtchn_port_t port)
{
struct shared_info *s = HYPERVISOR_shared_info;
sync_clear_bit(port, BM(&s->evtchn_pending[0]));
}

-static void evtchn_2l_set_pending(unsigned port)
+static void evtchn_2l_set_pending(evtchn_port_t port)
{
struct shared_info *s = HYPERVISOR_shared_info;
sync_set_bit(port, BM(&s->evtchn_pending[0]));
}

-static bool evtchn_2l_is_pending(unsigned port)
+static bool evtchn_2l_is_pending(evtchn_port_t port)
{
struct shared_info *s = HYPERVISOR_shared_info;
return sync_test_bit(port, BM(&s->evtchn_pending[0]));
}

-static bool evtchn_2l_test_and_set_mask(unsigned port)
+static bool evtchn_2l_test_and_set_mask(evtchn_port_t port)
{
struct shared_info *s = HYPERVISOR_shared_info;
return sync_test_and_set_bit(port, BM(&s->evtchn_mask[0]));
}

-static void evtchn_2l_mask(unsigned port)
+static void evtchn_2l_mask(evtchn_port_t port)
{
struct shared_info *s = HYPERVISOR_shared_info;
sync_set_bit(port, BM(&s->evtchn_mask[0]));
}

-static void evtchn_2l_unmask(unsigned port)
+static void evtchn_2l_unmask(evtchn_port_t port)
{
struct shared_info *s = HYPERVISOR_shared_info;
unsigned int cpu = get_cpu();
@@ -173,7 +173,7 @@ static void evtchn_2l_handle_events(unsigned cpu)
/* Timer interrupt has highest priority. */
irq = irq_from_virq(cpu, VIRQ_TIMER);
if (irq != -1) {
- unsigned int evtchn = evtchn_from_irq(irq);
+ evtchn_port_t evtchn = evtchn_from_irq(irq);
word_idx = evtchn / BITS_PER_LONG;
bit_idx = evtchn % BITS_PER_LONG;
if (active_evtchns(cpu, s, word_idx) & (1ULL << bit_idx))
@@ -228,7 +228,7 @@ static void evtchn_2l_handle_events(unsigned cpu)

do {
xen_ulong_t bits;
- int port;
+ evtchn_port_t port;

bits = MASK_LSBS(pending_bits, bit_idx);

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 499eff7d3f65..3a791c8485d0 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -116,7 +116,7 @@ static void clear_evtchn_to_irq_all(void)
}
}

-static int set_evtchn_to_irq(unsigned evtchn, unsigned irq)
+static int set_evtchn_to_irq(evtchn_port_t evtchn, unsigned int irq)
{
unsigned row;
unsigned col;
@@ -143,7 +143,7 @@ static int set_evtchn_to_irq(unsigned evtchn, unsigned irq)
return 0;
}

-int get_evtchn_to_irq(unsigned evtchn)
+int get_evtchn_to_irq(evtchn_port_t evtchn)
{
if (evtchn >= xen_evtchn_max_channels())
return -1;
@@ -162,7 +162,7 @@ struct irq_info *info_for_irq(unsigned irq)
static int xen_irq_info_common_setup(struct irq_info *info,
unsigned irq,
enum xen_irq_type type,
- unsigned evtchn,
+ evtchn_port_t evtchn,
unsigned short cpu)
{
int ret;
@@ -184,7 +184,7 @@ static int xen_irq_info_common_setup(struct irq_info *info,
}

static int xen_irq_info_evtchn_setup(unsigned irq,
- unsigned evtchn)
+ evtchn_port_t evtchn)
{
struct irq_info *info = info_for_irq(irq);

@@ -193,7 +193,7 @@ static int xen_irq_info_evtchn_setup(unsigned irq,

static int xen_irq_info_ipi_setup(unsigned cpu,
unsigned irq,
- unsigned evtchn,
+ evtchn_port_t evtchn,
enum ipi_vector ipi)
{
struct irq_info *info = info_for_irq(irq);
@@ -207,7 +207,7 @@ static int xen_irq_info_ipi_setup(unsigned cpu,

static int xen_irq_info_virq_setup(unsigned cpu,
unsigned irq,
- unsigned evtchn,
+ evtchn_port_t evtchn,
unsigned virq)
{
struct irq_info *info = info_for_irq(irq);
@@ -220,7 +220,7 @@ static int xen_irq_info_virq_setup(unsigned cpu,
}

static int xen_irq_info_pirq_setup(unsigned irq,
- unsigned evtchn,
+ evtchn_port_t evtchn,
unsigned pirq,
unsigned gsi,
uint16_t domid,
@@ -245,7 +245,7 @@ static void xen_irq_info_cleanup(struct irq_info *info)
/*
* Accessors for packed IRQ information.
*/
-unsigned int evtchn_from_irq(unsigned irq)
+evtchn_port_t evtchn_from_irq(unsigned irq)
{
if (WARN(irq >= nr_irqs, "Invalid irq %d!\n", irq))
return 0;
@@ -253,7 +253,7 @@ unsigned int evtchn_from_irq(unsigned irq)
return info_for_irq(irq)->evtchn;
}

-unsigned irq_from_evtchn(unsigned int evtchn)
+unsigned int irq_from_evtchn(evtchn_port_t evtchn)
{
return get_evtchn_to_irq(evtchn);
}
@@ -304,7 +304,7 @@ unsigned cpu_from_irq(unsigned irq)
return info_for_irq(irq)->cpu;
}

-unsigned int cpu_from_evtchn(unsigned int evtchn)
+unsigned int cpu_from_evtchn(evtchn_port_t evtchn)
{
int irq = get_evtchn_to_irq(evtchn);
unsigned ret = 0;
@@ -330,9 +330,9 @@ static bool pirq_needs_eoi_flag(unsigned irq)
return info->u.pirq.flags & PIRQ_NEEDS_EOI;
}

-static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
+static void bind_evtchn_to_cpu(evtchn_port_t evtchn, unsigned int cpu)
{
- int irq = get_evtchn_to_irq(chn);
+ int irq = get_evtchn_to_irq(evtchn);
struct irq_info *info = info_for_irq(irq);

BUG_ON(irq == -1);
@@ -354,7 +354,7 @@ static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
*/
void notify_remote_via_irq(int irq)
{
- int evtchn = evtchn_from_irq(irq);
+ evtchn_port_t evtchn = evtchn_from_irq(irq);

if (VALID_EVTCHN(evtchn))
notify_remote_via_evtchn(evtchn);
@@ -445,7 +445,7 @@ static void xen_free_irq(unsigned irq)
irq_free_desc(irq);
}

-static void xen_evtchn_close(unsigned int port)
+static void xen_evtchn_close(evtchn_port_t port)
{
struct evtchn_close close;

@@ -472,7 +472,7 @@ static void pirq_query_unmask(int irq)

static void eoi_pirq(struct irq_data *data)
{
- int evtchn = evtchn_from_irq(data->irq);
+ evtchn_port_t evtchn = evtchn_from_irq(data->irq);
struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
int rc = 0;

@@ -508,7 +508,7 @@ static unsigned int __startup_pirq(unsigned int irq)
{
struct evtchn_bind_pirq bind_pirq;
struct irq_info *info = info_for_irq(irq);
- int evtchn = evtchn_from_irq(irq);
+ evtchn_port_t evtchn = evtchn_from_irq(irq);
int rc;

BUG_ON(info->type != IRQT_PIRQ);
@@ -561,7 +561,7 @@ static void shutdown_pirq(struct irq_data *data)
{
unsigned int irq = data->irq;
struct irq_info *info = info_for_irq(irq);
- unsigned evtchn = evtchn_from_irq(irq);
+ evtchn_port_t evtchn = evtchn_from_irq(irq);

BUG_ON(info->type != IRQT_PIRQ);

@@ -601,7 +601,7 @@ EXPORT_SYMBOL_GPL(xen_irq_from_gsi);

static void __unbind_from_irq(unsigned int irq)
{
- int evtchn = evtchn_from_irq(irq);
+ evtchn_port_t evtchn = evtchn_from_irq(irq);
struct irq_info *info = irq_get_handler_data(irq);

if (info->refcnt > 0) {
@@ -827,7 +827,7 @@ int xen_pirq_from_irq(unsigned irq)
}
EXPORT_SYMBOL_GPL(xen_pirq_from_irq);

-int bind_evtchn_to_irq(unsigned int evtchn)
+int bind_evtchn_to_irq(evtchn_port_t evtchn)
{
int irq;
int ret;
@@ -870,8 +870,8 @@ EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
{
struct evtchn_bind_ipi bind_ipi;
- int evtchn, irq;
- int ret;
+ evtchn_port_t evtchn;
+ int ret, irq;

mutex_lock(&irq_mapping_update_lock);

@@ -909,7 +909,7 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
}

int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
- unsigned int remote_port)
+ evtchn_port_t remote_port)
{
struct evtchn_bind_interdomain bind_interdomain;
int err;
@@ -924,10 +924,11 @@ int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
}
EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irq);

-static int find_virq(unsigned int virq, unsigned int cpu)
+static int find_virq(unsigned int virq, unsigned int cpu, evtchn_port_t *evtchn)
{
struct evtchn_status status;
- int port, rc = -ENOENT;
+ evtchn_port_t port;
+ int rc = -ENOENT;

memset(&status, 0, sizeof(status));
for (port = 0; port < xen_evtchn_max_channels(); port++) {
@@ -939,7 +940,7 @@ static int find_virq(unsigned int virq, unsigned int cpu)
if (status.status != EVTCHNSTAT_virq)
continue;
if (status.u.virq == virq && status.vcpu == xen_vcpu_nr(cpu)) {
- rc = port;
+ *evtchn = port;
break;
}
}
@@ -962,7 +963,8 @@ EXPORT_SYMBOL_GPL(xen_evtchn_nr_channels);
int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu)
{
struct evtchn_bind_virq bind_virq;
- int evtchn, irq, ret;
+ evtchn_port_t evtchn = 0;
+ int irq, ret;

mutex_lock(&irq_mapping_update_lock);

@@ -988,9 +990,8 @@ int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu)
evtchn = bind_virq.port;
else {
if (ret == -EEXIST)
- ret = find_virq(virq, cpu);
+ ret = find_virq(virq, cpu, &evtchn);
BUG_ON(ret < 0);
- evtchn = ret;
}

ret = xen_irq_info_virq_setup(cpu, irq, evtchn, virq);
@@ -1019,7 +1020,7 @@ static void unbind_from_irq(unsigned int irq)
mutex_unlock(&irq_mapping_update_lock);
}

-int bind_evtchn_to_irqhandler(unsigned int evtchn,
+int bind_evtchn_to_irqhandler(evtchn_port_t evtchn,
irq_handler_t handler,
unsigned long irqflags,
const char *devname, void *dev_id)
@@ -1040,7 +1041,7 @@ int bind_evtchn_to_irqhandler(unsigned int evtchn,
EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler);

int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
- unsigned int remote_port,
+ evtchn_port_t remote_port,
irq_handler_t handler,
unsigned long irqflags,
const char *devname,
@@ -1132,7 +1133,7 @@ int xen_set_irq_priority(unsigned irq, unsigned priority)
}
EXPORT_SYMBOL_GPL(xen_set_irq_priority);

-int evtchn_make_refcounted(unsigned int evtchn)
+int evtchn_make_refcounted(evtchn_port_t evtchn)
{
int irq = get_evtchn_to_irq(evtchn);
struct irq_info *info;
@@ -1153,7 +1154,7 @@ int evtchn_make_refcounted(unsigned int evtchn)
}
EXPORT_SYMBOL_GPL(evtchn_make_refcounted);

-int evtchn_get(unsigned int evtchn)
+int evtchn_get(evtchn_port_t evtchn)
{
int irq;
struct irq_info *info;
@@ -1186,7 +1187,7 @@ int evtchn_get(unsigned int evtchn)
}
EXPORT_SYMBOL_GPL(evtchn_get);

-void evtchn_put(unsigned int evtchn)
+void evtchn_put(evtchn_port_t evtchn)
{
int irq = get_evtchn_to_irq(evtchn);
if (WARN_ON(irq == -1))
@@ -1252,7 +1253,7 @@ void xen_hvm_evtchn_do_upcall(void)
EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall);

/* Rebind a new event channel to an existing irq. */
-void rebind_evtchn_irq(int evtchn, int irq)
+void rebind_evtchn_irq(evtchn_port_t evtchn, int irq)
{
struct irq_info *info = info_for_irq(irq);

@@ -1284,7 +1285,7 @@ void rebind_evtchn_irq(int evtchn, int irq)
}

/* Rebind an evtchn so that it gets delivered to a specific cpu */
-static int xen_rebind_evtchn_to_cpu(int evtchn, unsigned int tcpu)
+static int xen_rebind_evtchn_to_cpu(evtchn_port_t evtchn, unsigned int tcpu)
{
struct evtchn_bind_vcpu bind_vcpu;
int masked;
@@ -1342,7 +1343,7 @@ EXPORT_SYMBOL_GPL(xen_set_affinity_evtchn);

static void enable_dynirq(struct irq_data *data)
{
- int evtchn = evtchn_from_irq(data->irq);
+ evtchn_port_t evtchn = evtchn_from_irq(data->irq);

if (VALID_EVTCHN(evtchn))
unmask_evtchn(evtchn);
@@ -1350,7 +1351,7 @@ static void enable_dynirq(struct irq_data *data)

static void disable_dynirq(struct irq_data *data)
{
- int evtchn = evtchn_from_irq(data->irq);
+ evtchn_port_t evtchn = evtchn_from_irq(data->irq);

if (VALID_EVTCHN(evtchn))
mask_evtchn(evtchn);
@@ -1358,7 +1359,7 @@ static void disable_dynirq(struct irq_data *data)

static void ack_dynirq(struct irq_data *data)
{
- int evtchn = evtchn_from_irq(data->irq);
+ evtchn_port_t evtchn = evtchn_from_irq(data->irq);

if (!VALID_EVTCHN(evtchn))
return;
@@ -1385,7 +1386,7 @@ static void mask_ack_dynirq(struct irq_data *data)

static int retrigger_dynirq(struct irq_data *data)
{
- unsigned int evtchn = evtchn_from_irq(data->irq);
+ evtchn_port_t evtchn = evtchn_from_irq(data->irq);
int masked;

if (!VALID_EVTCHN(evtchn))
@@ -1440,7 +1441,8 @@ static void restore_pirqs(void)
static void restore_cpu_virqs(unsigned int cpu)
{
struct evtchn_bind_virq bind_virq;
- int virq, irq, evtchn;
+ evtchn_port_t evtchn;
+ int virq, irq;

for (virq = 0; virq < NR_VIRQS; virq++) {
if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1)
@@ -1465,7 +1467,8 @@ static void restore_cpu_virqs(unsigned int cpu)
static void restore_cpu_ipis(unsigned int cpu)
{
struct evtchn_bind_ipi bind_ipi;
- int ipi, irq, evtchn;
+ evtchn_port_t evtchn;
+ int ipi, irq;

for (ipi = 0; ipi < XEN_NR_IPIS; ipi++) {
if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1)
@@ -1489,7 +1492,7 @@ static void restore_cpu_ipis(unsigned int cpu)
/* Clear an irq's pending state, in preparation for polling on it */
void xen_clear_irq_pending(int irq)
{
- int evtchn = evtchn_from_irq(irq);
+ evtchn_port_t evtchn = evtchn_from_irq(irq);

if (VALID_EVTCHN(evtchn))
clear_evtchn(evtchn);
@@ -1497,7 +1500,7 @@ void xen_clear_irq_pending(int irq)
EXPORT_SYMBOL(xen_clear_irq_pending);
void xen_set_irq_pending(int irq)
{
- int evtchn = evtchn_from_irq(irq);
+ evtchn_port_t evtchn = evtchn_from_irq(irq);

if (VALID_EVTCHN(evtchn))
set_evtchn(evtchn);
@@ -1505,7 +1508,7 @@ void xen_set_irq_pending(int irq)

bool xen_test_irq_pending(int irq)
{
- int evtchn = evtchn_from_irq(irq);
+ evtchn_port_t evtchn = evtchn_from_irq(irq);
bool ret = false;

if (VALID_EVTCHN(evtchn))
@@ -1667,7 +1670,7 @@ module_param(fifo_events, bool, 0);
void __init xen_init_IRQ(void)
{
int ret = -EINVAL;
- unsigned int evtchn;
+ evtchn_port_t evtchn;

if (fifo_events)
ret = xen_evtchn_fifo_init();
diff --git a/drivers/xen/events/events_fifo.c b/drivers/xen/events/events_fifo.c
index 76b318e88382..c60ee0450173 100644
--- a/drivers/xen/events/events_fifo.c
+++ b/drivers/xen/events/events_fifo.c
@@ -82,7 +82,7 @@ static unsigned event_array_pages __read_mostly;

#endif

-static inline event_word_t *event_word_from_port(unsigned port)
+static inline event_word_t *event_word_from_port(evtchn_port_t port)
{
unsigned i = port / EVENT_WORDS_PER_PAGE;

@@ -140,7 +140,7 @@ static void init_array_page(event_word_t *array_page)

static int evtchn_fifo_setup(struct irq_info *info)
{
- unsigned port = info->evtchn;
+ evtchn_port_t port = info->evtchn;
unsigned new_array_pages;
int ret;

@@ -191,37 +191,37 @@ static void evtchn_fifo_bind_to_cpu(struct irq_info *info, unsigned cpu)
/* no-op */
}

-static void evtchn_fifo_clear_pending(unsigned port)
+static void evtchn_fifo_clear_pending(evtchn_port_t port)
{
event_word_t *word = event_word_from_port(port);
sync_clear_bit(EVTCHN_FIFO_BIT(PENDING, word), BM(word));
}

-static void evtchn_fifo_set_pending(unsigned port)
+static void evtchn_fifo_set_pending(evtchn_port_t port)
{
event_word_t *word = event_word_from_port(port);
sync_set_bit(EVTCHN_FIFO_BIT(PENDING, word), BM(word));
}

-static bool evtchn_fifo_is_pending(unsigned port)
+static bool evtchn_fifo_is_pending(evtchn_port_t port)
{
event_word_t *word = event_word_from_port(port);
return sync_test_bit(EVTCHN_FIFO_BIT(PENDING, word), BM(word));
}

-static bool evtchn_fifo_test_and_set_mask(unsigned port)
+static bool evtchn_fifo_test_and_set_mask(evtchn_port_t port)
{
event_word_t *word = event_word_from_port(port);
return sync_test_and_set_bit(EVTCHN_FIFO_BIT(MASKED, word), BM(word));
}

-static void evtchn_fifo_mask(unsigned port)
+static void evtchn_fifo_mask(evtchn_port_t port)
{
event_word_t *word = event_word_from_port(port);
sync_set_bit(EVTCHN_FIFO_BIT(MASKED, word), BM(word));
}

-static bool evtchn_fifo_is_masked(unsigned port)
+static bool evtchn_fifo_is_masked(evtchn_port_t port)
{
event_word_t *word = event_word_from_port(port);
return sync_test_bit(EVTCHN_FIFO_BIT(MASKED, word), BM(word));
@@ -242,7 +242,7 @@ static void clear_masked(volatile event_word_t *word)
} while (w != old);
}

-static void evtchn_fifo_unmask(unsigned port)
+static void evtchn_fifo_unmask(evtchn_port_t port)
{
event_word_t *word = event_word_from_port(port);

@@ -270,7 +270,7 @@ static uint32_t clear_linked(volatile event_word_t *word)
return w & EVTCHN_FIFO_LINK_MASK;
}

-static void handle_irq_for_port(unsigned port)
+static void handle_irq_for_port(evtchn_port_t port)
{
int irq;

@@ -286,7 +286,7 @@ static void consume_one_event(unsigned cpu,
{
struct evtchn_fifo_queue *q = &per_cpu(cpu_queue, cpu);
uint32_t head;
- unsigned port;
+ evtchn_port_t port;
event_word_t *word;

head = q->head[priority];
diff --git a/drivers/xen/events/events_internal.h b/drivers/xen/events/events_internal.h
index 82938cff6c7a..10684feb094e 100644
--- a/drivers/xen/events/events_internal.h
+++ b/drivers/xen/events/events_internal.h
@@ -33,7 +33,7 @@ struct irq_info {
int refcnt;
enum xen_irq_type type; /* type */
unsigned irq;
- unsigned int evtchn; /* event channel */
+ evtchn_port_t evtchn; /* event channel */
unsigned short cpu; /* cpu bound */

union {
@@ -60,12 +60,12 @@ struct evtchn_ops {
int (*setup)(struct irq_info *info);
void (*bind_to_cpu)(struct irq_info *info, unsigned cpu);

- void (*clear_pending)(unsigned port);
- void (*set_pending)(unsigned port);
- bool (*is_pending)(unsigned port);
- bool (*test_and_set_mask)(unsigned port);
- void (*mask)(unsigned port);
- void (*unmask)(unsigned port);
+ void (*clear_pending)(evtchn_port_t port);
+ void (*set_pending)(evtchn_port_t port);
+ bool (*is_pending)(evtchn_port_t port);
+ bool (*test_and_set_mask)(evtchn_port_t port);
+ void (*mask)(evtchn_port_t port);
+ void (*unmask)(evtchn_port_t port);

void (*handle_events)(unsigned cpu);
void (*resume)(void);
@@ -74,11 +74,11 @@ struct evtchn_ops {
extern const struct evtchn_ops *evtchn_ops;

extern int **evtchn_to_irq;
-int get_evtchn_to_irq(unsigned int evtchn);
+int get_evtchn_to_irq(evtchn_port_t evtchn);

struct irq_info *info_for_irq(unsigned irq);
unsigned cpu_from_irq(unsigned irq);
-unsigned cpu_from_evtchn(unsigned int evtchn);
+unsigned int cpu_from_evtchn(evtchn_port_t evtchn);

static inline unsigned xen_evtchn_max_channels(void)
{
@@ -102,32 +102,32 @@ static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info,
evtchn_ops->bind_to_cpu(info, cpu);
}

-static inline void clear_evtchn(unsigned port)
+static inline void clear_evtchn(evtchn_port_t port)
{
evtchn_ops->clear_pending(port);
}

-static inline void set_evtchn(unsigned port)
+static inline void set_evtchn(evtchn_port_t port)
{
evtchn_ops->set_pending(port);
}

-static inline bool test_evtchn(unsigned port)
+static inline bool test_evtchn(evtchn_port_t port)
{
return evtchn_ops->is_pending(port);
}

-static inline bool test_and_set_mask(unsigned port)
+static inline bool test_and_set_mask(evtchn_port_t port)
{
return evtchn_ops->test_and_set_mask(port);
}

-static inline void mask_evtchn(unsigned port)
+static inline void mask_evtchn(evtchn_port_t port)
{
return evtchn_ops->mask(port);
}

-static inline void unmask_evtchn(unsigned port)
+static inline void unmask_evtchn(evtchn_port_t port)
{
return evtchn_ops->unmask(port);
}
diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index 052b55a14ebc..6e0b1dd5573c 100644
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -83,7 +83,7 @@ struct per_user_data {
struct user_evtchn {
struct rb_node node;
struct per_user_data *user;
- unsigned port;
+ evtchn_port_t port;
bool enabled;
};

@@ -138,7 +138,8 @@ static void del_evtchn(struct per_user_data *u, struct user_evtchn *evtchn)
kfree(evtchn);
}

-static struct user_evtchn *find_evtchn(struct per_user_data *u, unsigned port)
+static struct user_evtchn *find_evtchn(struct per_user_data *u,
+ evtchn_port_t port)
{
struct rb_node *node = u->evtchns.rb_node;

@@ -163,7 +164,7 @@ static irqreturn_t evtchn_interrupt(int irq, void *data)
struct per_user_data *u = evtchn->user;

WARN(!evtchn->enabled,
- "Interrupt for port %d, but apparently not enabled; per-user %p\n",
+ "Interrupt for port %u, but apparently not enabled; per-user %p\n",
evtchn->port, u);

disable_irq_nosync(irq);
@@ -286,7 +287,7 @@ static ssize_t evtchn_write(struct file *file, const char __user *buf,
mutex_lock(&u->bind_mutex);

for (i = 0; i < (count/sizeof(evtchn_port_t)); i++) {
- unsigned port = kbuf[i];
+ evtchn_port_t port = kbuf[i];
struct user_evtchn *evtchn;

evtchn = find_evtchn(u, port);
@@ -361,7 +362,7 @@ static int evtchn_resize_ring(struct per_user_data *u)
return 0;
}

-static int evtchn_bind_to_user(struct per_user_data *u, int port)
+static int evtchn_bind_to_user(struct per_user_data *u, evtchn_port_t port)
{
struct user_evtchn *evtchn;
struct evtchn_close close;
@@ -423,7 +424,7 @@ static void evtchn_unbind_from_user(struct per_user_data *u,

static DEFINE_PER_CPU(int, bind_last_selected_cpu);

-static void evtchn_bind_interdom_next_vcpu(int evtchn)
+static void evtchn_bind_interdom_next_vcpu(evtchn_port_t evtchn)
{
unsigned int selected_cpu, irq;
struct irq_desc *desc;
diff --git a/drivers/xen/gntdev-common.h b/drivers/xen/gntdev-common.h
index 9a3960ecff6c..20d7d059dadb 100644
--- a/drivers/xen/gntdev-common.h
+++ b/drivers/xen/gntdev-common.h
@@ -15,6 +15,7 @@
#include <linux/mman.h>
#include <linux/mmu_notifier.h>
#include <linux/types.h>
+#include <xen/interface/event_channel.h>

struct gntdev_dmabuf_priv;

@@ -38,7 +39,7 @@ struct gntdev_unmap_notify {
int flags;
/* Address relative to the start of the gntdev_grant_map. */
int addr;
- int event;
+ evtchn_port_t event;
};

struct gntdev_grant_map {
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 0258415ca0b2..50651e566564 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -652,7 +652,7 @@ static long gntdev_ioctl_notify(struct gntdev_priv *priv, void __user *u)
struct gntdev_grant_map *map;
int rc;
int out_flags;
- unsigned int out_event;
+ evtchn_port_t out_event;

if (copy_from_user(&op, u, sizeof(op)))
return -EFAULT;
diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index c57c71b7d53d..cf4ce3e9358d 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -300,7 +300,7 @@ static struct sock_mapping *pvcalls_new_active_socket(
struct pvcalls_fedata *fedata,
uint64_t id,
grant_ref_t ref,
- uint32_t evtchn,
+ evtchn_port_t evtchn,
struct socket *sock)
{
int ret;
@@ -905,7 +905,8 @@ static irqreturn_t pvcalls_back_conn_event(int irq, void *sock_map)

static int backend_connect(struct xenbus_device *dev)
{
- int err, evtchn;
+ int err;
+ evtchn_port_t evtchn;
grant_ref_t ring_ref;
struct pvcalls_fedata *fedata = NULL;

diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 57592a6b5c9e..b43b5595e988 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -368,12 +368,12 @@ static int alloc_active_ring(struct sock_mapping *map)
return -ENOMEM;
}

-static int create_active(struct sock_mapping *map, int *evtchn)
+static int create_active(struct sock_mapping *map, evtchn_port_t *evtchn)
{
void *bytes;
int ret = -ENOMEM, irq = -1, i;

- *evtchn = -1;
+ *evtchn = 0;
init_waitqueue_head(&map->active.inflight_conn_req);

bytes = map->active.data.in;
@@ -404,7 +404,7 @@ static int create_active(struct sock_mapping *map, int *evtchn)
return 0;

out_error:
- if (*evtchn >= 0)
+ if (*evtchn > 0)
xenbus_free_evtchn(pvcalls_front_dev, *evtchn);
return ret;
}
@@ -415,7 +415,8 @@ int pvcalls_front_connect(struct socket *sock, struct sockaddr *addr,
struct pvcalls_bedata *bedata;
struct sock_mapping *map = NULL;
struct xen_pvcalls_request *req;
- int notify, req_id, ret, evtchn;
+ int notify, req_id, ret;
+ evtchn_port_t evtchn;

if (addr->sa_family != AF_INET || sock->type != SOCK_STREAM)
return -EOPNOTSUPP;
@@ -765,7 +766,8 @@ int pvcalls_front_accept(struct socket *sock, struct socket *newsock, int flags)
struct sock_mapping *map;
struct sock_mapping *map2 = NULL;
struct xen_pvcalls_request *req;
- int notify, req_id, ret, evtchn, nonblock;
+ int notify, req_id, ret, nonblock;
+ evtchn_port_t evtchn;

map = pvcalls_enter_sock(sock);
if (IS_ERR(map))
@@ -1125,7 +1127,8 @@ static int pvcalls_front_remove(struct xenbus_device *dev)
static int pvcalls_front_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
- int ret = -ENOMEM, evtchn, i;
+ int ret = -ENOMEM, i;
+ evtchn_port_t evtchn;
unsigned int max_page_order, function_calls, len;
char *versions;
grant_ref_t gref_head = 0;
diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
index 833b2d2c4318..f2115587855f 100644
--- a/drivers/xen/xen-pciback/xenbus.c
+++ b/drivers/xen/xen-pciback/xenbus.c
@@ -105,13 +105,13 @@ static void free_pdev(struct xen_pcibk_device *pdev)
}

static int xen_pcibk_do_attach(struct xen_pcibk_device *pdev, int gnt_ref,
- int remote_evtchn)
+ evtchn_port_t remote_evtchn)
{
int err = 0;
void *vaddr;

dev_dbg(&pdev->xdev->dev,
- "Attaching to frontend resources - gnt_ref=%d evtchn=%d\n",
+ "Attaching to frontend resources - gnt_ref=%d evtchn=%u\n",
gnt_ref, remote_evtchn);

err = xenbus_map_ring_valloc(pdev->xdev, &gnt_ref, 1, &vaddr);
@@ -142,7 +142,8 @@ static int xen_pcibk_do_attach(struct xen_pcibk_device *pdev, int gnt_ref,
static int xen_pcibk_attach(struct xen_pcibk_device *pdev)
{
int err = 0;
- int gnt_ref, remote_evtchn;
+ int gnt_ref;
+ evtchn_port_t remote_evtchn;
char *magic = NULL;


diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index ba0942e481bc..75c0a2e9a6db 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -854,7 +854,8 @@ static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref,
static int scsiback_map(struct vscsibk_info *info)
{
struct xenbus_device *dev = info->dev;
- unsigned int ring_ref, evtchn;
+ unsigned int ring_ref;
+ evtchn_port_t evtchn;
int err;

err = xenbus_gather(XBT_NIL, dev->otherend,
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index e17ca8156171..1f87514e4efc 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -391,7 +391,7 @@ EXPORT_SYMBOL_GPL(xenbus_grant_ring);
* error, the device will switch to XenbusStateClosing, and the error will be
* saved in the store.
*/
-int xenbus_alloc_evtchn(struct xenbus_device *dev, int *port)
+int xenbus_alloc_evtchn(struct xenbus_device *dev, evtchn_port_t *port)
{
struct evtchn_alloc_unbound alloc_unbound;
int err;
@@ -414,7 +414,7 @@ EXPORT_SYMBOL_GPL(xenbus_alloc_evtchn);
/**
* Free an existing event channel. Returns 0 on success or -errno on error.
*/
-int xenbus_free_evtchn(struct xenbus_device *dev, int port)
+int xenbus_free_evtchn(struct xenbus_device *dev, evtchn_port_t port)
{
struct evtchn_close close;
int err;
@@ -423,7 +423,7 @@ int xenbus_free_evtchn(struct xenbus_device *dev, int port)

err = HYPERVISOR_event_channel_op(EVTCHNOP_close, &close);
if (err)
- xenbus_dev_error(dev, err, "freeing event channel %d", port);
+ xenbus_dev_error(dev, err, "freeing event channel %u", port);

return err;
}
diff --git a/include/xen/events.h b/include/xen/events.h
index c0e6a0598397..12b0dcb6a120 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -14,8 +14,8 @@

unsigned xen_evtchn_nr_channels(void);

-int bind_evtchn_to_irq(unsigned int evtchn);
-int bind_evtchn_to_irqhandler(unsigned int evtchn,
+int bind_evtchn_to_irq(evtchn_port_t evtchn);
+int bind_evtchn_to_irqhandler(evtchn_port_t evtchn,
irq_handler_t handler,
unsigned long irqflags, const char *devname,
void *dev_id);
@@ -31,9 +31,9 @@ int bind_ipi_to_irqhandler(enum ipi_vector ipi,
const char *devname,
void *dev_id);
int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
- unsigned int remote_port);
+ evtchn_port_t remote_port);
int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
- unsigned int remote_port,
+ evtchn_port_t remote_port,
irq_handler_t handler,
unsigned long irqflags,
const char *devname,
@@ -54,15 +54,15 @@ int xen_set_irq_priority(unsigned irq, unsigned priority);
/*
* Allow extra references to event channels exposed to userspace by evtchn
*/
-int evtchn_make_refcounted(unsigned int evtchn);
-int evtchn_get(unsigned int evtchn);
-void evtchn_put(unsigned int evtchn);
+int evtchn_make_refcounted(evtchn_port_t evtchn);
+int evtchn_get(evtchn_port_t evtchn);
+void evtchn_put(evtchn_port_t evtchn);

void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
-void rebind_evtchn_irq(int evtchn, int irq);
+void rebind_evtchn_irq(evtchn_port_t evtchn, int irq);
int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu);

-static inline void notify_remote_via_evtchn(int port)
+static inline void notify_remote_via_evtchn(evtchn_port_t port)
{
struct evtchn_send send = { .port = port };
(void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
@@ -86,9 +86,9 @@ void xen_poll_irq(int irq);
void xen_poll_irq_timeout(int irq, u64 timeout);

/* Determine the IRQ which is bound to an event channel */
-unsigned irq_from_evtchn(unsigned int evtchn);
+unsigned int irq_from_evtchn(evtchn_port_t evtchn);
int irq_from_virq(unsigned int cpu, unsigned int virq);
-unsigned int evtchn_from_irq(unsigned irq);
+evtchn_port_t evtchn_from_irq(unsigned irq);

#ifdef CONFIG_XEN_PVHVM
/* Xen HVM evtchn vector callback */
diff --git a/include/xen/interface/event_channel.h b/include/xen/interface/event_channel.h
index 45650c9a06d5..cf80e338fbb0 100644
--- a/include/xen/interface/event_channel.h
+++ b/include/xen/interface/event_channel.h
@@ -220,7 +220,7 @@ struct evtchn_expand_array {
#define EVTCHNOP_set_priority 13
struct evtchn_set_priority {
/* IN parameters. */
- uint32_t port;
+ evtchn_port_t port;
uint32_t priority;
};

diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h
index 850a43bd69d3..725da8965eb9 100644
--- a/include/xen/xenbus.h
+++ b/include/xen/xenbus.h
@@ -47,6 +47,7 @@
#include <xen/interface/grant_table.h>
#include <xen/interface/io/xenbus.h>
#include <xen/interface/io/xs_wire.h>
+#include <xen/interface/event_channel.h>

#define XENBUS_MAX_RING_GRANT_ORDER 4
#define XENBUS_MAX_RING_GRANTS (1U << XENBUS_MAX_RING_GRANT_ORDER)
@@ -219,8 +220,8 @@ int xenbus_unmap_ring(struct xenbus_device *dev,
grant_handle_t *handles, unsigned int nr_handles,
unsigned long *vaddrs);

-int xenbus_alloc_evtchn(struct xenbus_device *dev, int *port);
-int xenbus_free_evtchn(struct xenbus_device *dev, int port);
+int xenbus_alloc_evtchn(struct xenbus_device *dev, evtchn_port_t *port);
+int xenbus_free_evtchn(struct xenbus_device *dev, evtchn_port_t port);

enum xenbus_state xenbus_read_driver_state(const char *path);

--
2.17.1