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-rw-r--r--drivers/xen/events/events_2l.c11
-rw-r--r--drivers/xen/events/events_base.c175
-rw-r--r--drivers/xen/events/events_internal.h18
3 files changed, 149 insertions, 55 deletions
diff --git a/drivers/xen/events/events_2l.c b/drivers/xen/events/events_2l.c
index e55677cca745..ecb402a149e3 100644
--- a/drivers/xen/events/events_2l.c
+++ b/drivers/xen/events/events_2l.c
@@ -41,6 +41,11 @@
static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
cpu_evtchn_mask);
+static unsigned evtchn_2l_max_channels(void)
+{
+ return NR_EVENT_CHANNELS;
+}
+
static void evtchn_2l_bind_to_cpu(struct irq_info *info, unsigned cpu)
{
clear_bit(info->evtchn, BM(per_cpu(cpu_evtchn_mask, info->cpu)));
@@ -238,7 +243,7 @@ static void evtchn_2l_handle_events(unsigned cpu)
/* Process port. */
port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx;
- irq = evtchn_to_irq[port];
+ irq = get_evtchn_to_irq(port);
if (irq != -1) {
desc = irq_to_desc(irq);
@@ -332,7 +337,7 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
int word_idx = i / BITS_PER_EVTCHN_WORD;
printk(" %d: event %d -> irq %d%s%s%s\n",
cpu_from_evtchn(i), i,
- evtchn_to_irq[i],
+ get_evtchn_to_irq(i),
sync_test_bit(word_idx, BM(&v->evtchn_pending_sel))
? "" : " l2-clear",
!sync_test_bit(i, BM(sh->evtchn_mask))
@@ -348,6 +353,8 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
}
static const struct evtchn_ops evtchn_ops_2l = {
+ .max_channels = evtchn_2l_max_channels,
+ .nr_channels = evtchn_2l_max_channels,
.bind_to_cpu = evtchn_2l_bind_to_cpu,
.clear_pending = evtchn_2l_clear_pending,
.set_pending = evtchn_2l_set_pending,
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 929eccb77270..a6906665de53 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -77,12 +77,16 @@ static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1};
/* IRQ <-> IPI mapping */
static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1};
-int *evtchn_to_irq;
+int **evtchn_to_irq;
#ifdef CONFIG_X86
static unsigned long *pirq_eoi_map;
#endif
static bool (*pirq_needs_eoi)(unsigned irq);
+#define EVTCHN_ROW(e) (e / (PAGE_SIZE/sizeof(**evtchn_to_irq)))
+#define EVTCHN_COL(e) (e % (PAGE_SIZE/sizeof(**evtchn_to_irq)))
+#define EVTCHN_PER_ROW (PAGE_SIZE / sizeof(**evtchn_to_irq))
+
/* Xen will never allocate port zero for any purpose. */
#define VALID_EVTCHN(chn) ((chn) != 0)
@@ -92,6 +96,61 @@ static struct irq_chip xen_pirq_chip;
static void enable_dynirq(struct irq_data *data);
static void disable_dynirq(struct irq_data *data);
+static void clear_evtchn_to_irq_row(unsigned row)
+{
+ unsigned col;
+
+ for (col = 0; col < EVTCHN_PER_ROW; col++)
+ evtchn_to_irq[row][col] = -1;
+}
+
+static void clear_evtchn_to_irq_all(void)
+{
+ unsigned row;
+
+ for (row = 0; row < EVTCHN_ROW(xen_evtchn_max_channels()); row++) {
+ if (evtchn_to_irq[row] == NULL)
+ continue;
+ clear_evtchn_to_irq_row(row);
+ }
+}
+
+static int set_evtchn_to_irq(unsigned evtchn, unsigned irq)
+{
+ unsigned row;
+ unsigned col;
+
+ if (evtchn >= xen_evtchn_max_channels())
+ return -EINVAL;
+
+ row = EVTCHN_ROW(evtchn);
+ col = EVTCHN_COL(evtchn);
+
+ if (evtchn_to_irq[row] == NULL) {
+ /* Unallocated irq entries return -1 anyway */
+ if (irq == -1)
+ return 0;
+
+ evtchn_to_irq[row] = (int *)get_zeroed_page(GFP_KERNEL);
+ if (evtchn_to_irq[row] == NULL)
+ return -ENOMEM;
+
+ clear_evtchn_to_irq_row(row);
+ }
+
+ evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)] = irq;
+ return 0;
+}
+
+int get_evtchn_to_irq(unsigned evtchn)
+{
+ if (evtchn >= xen_evtchn_max_channels())
+ return -1;
+ if (evtchn_to_irq[EVTCHN_ROW(evtchn)] == NULL)
+ return -1;
+ return evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)];
+}
+
/* Get info for IRQ */
struct irq_info *info_for_irq(unsigned irq)
{
@@ -102,9 +161,10 @@ 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 short evtchn,
+ unsigned evtchn,
unsigned short cpu)
{
+ int ret;
BUG_ON(info->type != IRQT_UNBOUND && info->type != type);
@@ -113,7 +173,9 @@ static int xen_irq_info_common_setup(struct irq_info *info,
info->evtchn = evtchn;
info->cpu = cpu;
- evtchn_to_irq[evtchn] = irq;
+ ret = set_evtchn_to_irq(evtchn, irq);
+ if (ret < 0)
+ return ret;
irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
@@ -121,7 +183,7 @@ static int xen_irq_info_common_setup(struct irq_info *info,
}
static int xen_irq_info_evtchn_setup(unsigned irq,
- unsigned short evtchn)
+ unsigned evtchn)
{
struct irq_info *info = info_for_irq(irq);
@@ -130,7 +192,7 @@ static int xen_irq_info_evtchn_setup(unsigned irq,
static int xen_irq_info_ipi_setup(unsigned cpu,
unsigned irq,
- unsigned short evtchn,
+ unsigned evtchn,
enum ipi_vector ipi)
{
struct irq_info *info = info_for_irq(irq);
@@ -144,8 +206,8 @@ static int xen_irq_info_ipi_setup(unsigned cpu,
static int xen_irq_info_virq_setup(unsigned cpu,
unsigned irq,
- unsigned short evtchn,
- unsigned short virq)
+ unsigned evtchn,
+ unsigned virq)
{
struct irq_info *info = info_for_irq(irq);
@@ -157,9 +219,9 @@ static int xen_irq_info_virq_setup(unsigned cpu,
}
static int xen_irq_info_pirq_setup(unsigned irq,
- unsigned short evtchn,
- unsigned short pirq,
- unsigned short gsi,
+ unsigned evtchn,
+ unsigned pirq,
+ unsigned gsi,
uint16_t domid,
unsigned char flags)
{
@@ -173,6 +235,12 @@ static int xen_irq_info_pirq_setup(unsigned irq,
return xen_irq_info_common_setup(info, irq, IRQT_PIRQ, evtchn, 0);
}
+static void xen_irq_info_cleanup(struct irq_info *info)
+{
+ set_evtchn_to_irq(info->evtchn, -1);
+ info->evtchn = 0;
+}
+
/*
* Accessors for packed IRQ information.
*/
@@ -186,7 +254,7 @@ unsigned int evtchn_from_irq(unsigned irq)
unsigned irq_from_evtchn(unsigned int evtchn)
{
- return evtchn_to_irq[evtchn];
+ return get_evtchn_to_irq(evtchn);
}
EXPORT_SYMBOL_GPL(irq_from_evtchn);
@@ -237,7 +305,7 @@ unsigned cpu_from_irq(unsigned irq)
unsigned int cpu_from_evtchn(unsigned int evtchn)
{
- int irq = evtchn_to_irq[evtchn];
+ int irq = get_evtchn_to_irq(evtchn);
unsigned ret = 0;
if (irq != -1)
@@ -263,7 +331,7 @@ static bool pirq_needs_eoi_flag(unsigned irq)
static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
{
- int irq = evtchn_to_irq[chn];
+ int irq = get_evtchn_to_irq(chn);
struct irq_info *info = info_for_irq(irq);
BUG_ON(irq == -1);
@@ -386,6 +454,18 @@ static void xen_free_irq(unsigned irq)
irq_free_desc(irq);
}
+static void xen_evtchn_close(unsigned int port)
+{
+ struct evtchn_close close;
+
+ close.port = port;
+ if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
+ BUG();
+
+ /* Closed ports are implicitly re-bound to VCPU0. */
+ bind_evtchn_to_cpu(port, 0);
+}
+
static void pirq_query_unmask(int irq)
{
struct physdev_irq_status_query irq_status;
@@ -458,7 +538,13 @@ static unsigned int __startup_pirq(unsigned int irq)
pirq_query_unmask(irq);
- evtchn_to_irq[evtchn] = irq;
+ rc = set_evtchn_to_irq(evtchn, irq);
+ if (rc != 0) {
+ pr_err("irq%d: Failed to set port to irq mapping (%d)\n",
+ irq, rc);
+ xen_evtchn_close(evtchn);
+ return 0;
+ }
bind_evtchn_to_cpu(evtchn, 0);
info->evtchn = evtchn;
@@ -476,10 +562,9 @@ static unsigned int startup_pirq(struct irq_data *data)
static void shutdown_pirq(struct irq_data *data)
{
- struct evtchn_close close;
unsigned int irq = data->irq;
struct irq_info *info = info_for_irq(irq);
- int evtchn = evtchn_from_irq(irq);
+ unsigned evtchn = evtchn_from_irq(irq);
BUG_ON(info->type != IRQT_PIRQ);
@@ -487,14 +572,8 @@ static void shutdown_pirq(struct irq_data *data)
return;
mask_evtchn(evtchn);
-
- close.port = evtchn;
- if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
- BUG();
-
- bind_evtchn_to_cpu(evtchn, 0);
- evtchn_to_irq[evtchn] = -1;
- info->evtchn = 0;
+ xen_evtchn_close(evtchn);
+ xen_irq_info_cleanup(info);
}
static void enable_pirq(struct irq_data *data)
@@ -525,7 +604,6 @@ EXPORT_SYMBOL_GPL(xen_irq_from_gsi);
static void __unbind_from_irq(unsigned int irq)
{
- struct evtchn_close close;
int evtchn = evtchn_from_irq(irq);
struct irq_info *info = irq_get_handler_data(irq);
@@ -536,27 +614,22 @@ static void __unbind_from_irq(unsigned int irq)
}
if (VALID_EVTCHN(evtchn)) {
- close.port = evtchn;
- if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
- BUG();
+ unsigned int cpu = cpu_from_irq(irq);
+
+ xen_evtchn_close(evtchn);
switch (type_from_irq(irq)) {
case IRQT_VIRQ:
- per_cpu(virq_to_irq, cpu_from_evtchn(evtchn))
- [virq_from_irq(irq)] = -1;
+ per_cpu(virq_to_irq, cpu)[virq_from_irq(irq)] = -1;
break;
case IRQT_IPI:
- per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
- [ipi_from_irq(irq)] = -1;
+ per_cpu(ipi_to_irq, cpu)[ipi_from_irq(irq)] = -1;
break;
default:
break;
}
- /* Closed ports are implicitly re-bound to VCPU0. */
- bind_evtchn_to_cpu(evtchn, 0);
-
- evtchn_to_irq[evtchn] = -1;
+ xen_irq_info_cleanup(info);
}
BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
@@ -760,9 +833,12 @@ int bind_evtchn_to_irq(unsigned int evtchn)
int irq;
int ret;
+ if (evtchn >= xen_evtchn_max_channels())
+ return -ENOMEM;
+
mutex_lock(&irq_mapping_update_lock);
- irq = evtchn_to_irq[evtchn];
+ irq = get_evtchn_to_irq(evtchn);
if (irq == -1) {
irq = xen_allocate_irq_dynamic();
@@ -852,7 +928,7 @@ static int find_virq(unsigned int virq, unsigned int cpu)
int port, rc = -ENOENT;
memset(&status, 0, sizeof(status));
- for (port = 0; port <= NR_EVENT_CHANNELS; port++) {
+ for (port = 0; port < xen_evtchn_max_channels(); port++) {
status.dom = DOMID_SELF;
status.port = port;
rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status);
@@ -1022,7 +1098,7 @@ EXPORT_SYMBOL_GPL(unbind_from_irqhandler);
int evtchn_make_refcounted(unsigned int evtchn)
{
- int irq = evtchn_to_irq[evtchn];
+ int irq = get_evtchn_to_irq(evtchn);
struct irq_info *info;
if (irq == -1)
@@ -1047,12 +1123,12 @@ int evtchn_get(unsigned int evtchn)
struct irq_info *info;
int err = -ENOENT;
- if (evtchn >= NR_EVENT_CHANNELS)
+ if (evtchn >= xen_evtchn_max_channels())
return -EINVAL;
mutex_lock(&irq_mapping_update_lock);
- irq = evtchn_to_irq[evtchn];
+ irq = get_evtchn_to_irq(evtchn);
if (irq == -1)
goto done;
@@ -1076,7 +1152,7 @@ EXPORT_SYMBOL_GPL(evtchn_get);
void evtchn_put(unsigned int evtchn)
{
- int irq = evtchn_to_irq[evtchn];
+ int irq = get_evtchn_to_irq(evtchn);
if (WARN_ON(irq == -1))
return;
unbind_from_irq(irq);
@@ -1163,7 +1239,7 @@ void rebind_evtchn_irq(int evtchn, int irq)
mutex_lock(&irq_mapping_update_lock);
/* After resume the irq<->evtchn mappings are all cleared out */
- BUG_ON(evtchn_to_irq[evtchn] != -1);
+ BUG_ON(get_evtchn_to_irq(evtchn) != -1);
/* Expect irq to have been bound before,
so there should be a proper type */
BUG_ON(info->type == IRQT_UNBOUND);
@@ -1448,15 +1524,14 @@ void xen_irq_resume(void)
struct irq_info *info;
/* New event-channel space is not 'live' yet. */
- for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
+ for (evtchn = 0; evtchn < xen_evtchn_nr_channels(); evtchn++)
mask_evtchn(evtchn);
/* No IRQ <-> event-channel mappings. */
list_for_each_entry(info, &xen_irq_list_head, list)
info->evtchn = 0; /* zap event-channel binding */
- for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
- evtchn_to_irq[evtchn] = -1;
+ clear_evtchn_to_irq_all();
for_each_possible_cpu(cpu) {
restore_cpu_virqs(cpu);
@@ -1553,14 +1628,12 @@ void __init xen_init_IRQ(void)
xen_evtchn_2l_init();
- evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
- GFP_KERNEL);
+ evtchn_to_irq = kcalloc(EVTCHN_ROW(xen_evtchn_max_channels()),
+ sizeof(*evtchn_to_irq), GFP_KERNEL);
BUG_ON(!evtchn_to_irq);
- for (i = 0; i < NR_EVENT_CHANNELS; i++)
- evtchn_to_irq[i] = -1;
/* No event channels are 'live' right now. */
- for (i = 0; i < NR_EVENT_CHANNELS; i++)
+ for (i = 0; i < xen_evtchn_nr_channels(); i++)
mask_evtchn(i);
pirq_needs_eoi = pirq_needs_eoi_flag;
diff --git a/drivers/xen/events/events_internal.h b/drivers/xen/events/events_internal.h
index dc9650265e04..a3d9aeceda1a 100644
--- a/drivers/xen/events/events_internal.h
+++ b/drivers/xen/events/events_internal.h
@@ -35,7 +35,7 @@ struct irq_info {
int refcnt;
enum xen_irq_type type; /* type */
unsigned irq;
- unsigned short evtchn; /* event channel */
+ unsigned int evtchn; /* event channel */
unsigned short cpu; /* cpu bound */
union {
@@ -55,6 +55,9 @@ struct irq_info {
#define PIRQ_SHAREABLE (1 << 1)
struct evtchn_ops {
+ unsigned (*max_channels)(void);
+ unsigned (*nr_channels)(void);
+
int (*setup)(struct irq_info *info);
void (*bind_to_cpu)(struct irq_info *info, unsigned cpu);
@@ -70,12 +73,23 @@ struct evtchn_ops {
extern const struct evtchn_ops *evtchn_ops;
-extern int *evtchn_to_irq;
+extern int **evtchn_to_irq;
+int get_evtchn_to_irq(unsigned int evtchn);
struct irq_info *info_for_irq(unsigned irq);
unsigned cpu_from_irq(unsigned irq);
unsigned cpu_from_evtchn(unsigned int evtchn);
+static inline unsigned xen_evtchn_max_channels(void)
+{
+ return evtchn_ops->max_channels();
+}
+
+static inline unsigned xen_evtchn_nr_channels(void)
+{
+ return evtchn_ops->nr_channels();
+}
+
/*
* Do any ABI specific setup for a bound event channel before it can
* be unmasked and used.
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-02 23:25:08 +0300