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Message-Id: <20231016062831.20630-5-jgross@suse.com>
Date: Mon, 16 Oct 2023 08:28:28 +0200
From: Juergen Gross <jgross@...e.com>
To: linux-kernel@...r.kernel.org
Cc: Juergen Gross <jgross@...e.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
xen-devel@...ts.xenproject.org
Subject: [PATCH 4/7] xen/events: remove some simple helpers from events_base.c
The helper functions type_from_irq() and cpu_from_irq() are just one
line functions used only internally.
Open code them where needed. At the same time modify and rename
get_evtchn_to_irq() to return a struct irq_info instead of the IRQ
number.
Signed-off-by: Juergen Gross <jgross@...e.com>
---
drivers/xen/events/events_base.c | 97 +++++++++++++-------------------
1 file changed, 38 insertions(+), 59 deletions(-)
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 97d71c5e7c28..4ada3b6a4164 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -246,15 +246,6 @@ static int set_evtchn_to_irq(evtchn_port_t evtchn, unsigned int irq)
return 0;
}
-static int get_evtchn_to_irq(evtchn_port_t evtchn)
-{
- if (evtchn >= xen_evtchn_max_channels())
- return -1;
- if (evtchn_to_irq[EVTCHN_ROW(evtchn)] == NULL)
- return -1;
- return READ_ONCE(evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)]);
-}
-
/* Get info for IRQ */
static struct irq_info *info_for_irq(unsigned irq)
{
@@ -272,6 +263,19 @@ static void set_info_for_irq(unsigned int irq, struct irq_info *info)
irq_set_chip_data(irq, info);
}
+static struct irq_info *evtchn_to_info(evtchn_port_t evtchn)
+{
+ int irq;
+
+ if (evtchn >= xen_evtchn_max_channels())
+ return NULL;
+ if (evtchn_to_irq[EVTCHN_ROW(evtchn)] == NULL)
+ return NULL;
+ irq = READ_ONCE(evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)]);
+
+ return (irq < 0) ? NULL : info_for_irq(irq);
+}
+
/* Per CPU channel accounting */
static void channels_on_cpu_dec(struct irq_info *info)
{
@@ -426,7 +430,9 @@ static evtchn_port_t evtchn_from_irq(unsigned int irq)
unsigned int irq_from_evtchn(evtchn_port_t evtchn)
{
- return get_evtchn_to_irq(evtchn);
+ struct irq_info *info = evtchn_to_info(evtchn);
+
+ return info ? info->irq : -1;
}
EXPORT_SYMBOL_GPL(irq_from_evtchn);
@@ -470,25 +476,11 @@ static unsigned pirq_from_irq(unsigned irq)
return info->u.pirq.pirq;
}
-static enum xen_irq_type type_from_irq(unsigned irq)
-{
- return info_for_irq(irq)->type;
-}
-
-static unsigned cpu_from_irq(unsigned irq)
-{
- return info_for_irq(irq)->cpu;
-}
-
unsigned int cpu_from_evtchn(evtchn_port_t evtchn)
{
- int irq = get_evtchn_to_irq(evtchn);
- unsigned ret = 0;
-
- if (irq != -1)
- ret = cpu_from_irq(irq);
+ struct irq_info *info = evtchn_to_info(evtchn);
- return ret;
+ return info ? info->cpu : 0;
}
static void do_mask(struct irq_info *info, u8 reason)
@@ -537,13 +529,12 @@ static bool pirq_needs_eoi_flag(unsigned irq)
static void bind_evtchn_to_cpu(evtchn_port_t evtchn, unsigned int cpu,
bool force_affinity)
{
- int irq = get_evtchn_to_irq(evtchn);
- struct irq_info *info = info_for_irq(irq);
+ struct irq_info *info = evtchn_to_info(evtchn);
- BUG_ON(irq == -1);
+ BUG_ON(info == NULL);
if (IS_ENABLED(CONFIG_SMP) && force_affinity) {
- struct irq_data *data = irq_get_irq_data(irq);
+ struct irq_data *data = irq_get_irq_data(info->irq);
irq_data_update_affinity(data, cpumask_of(cpu));
irq_data_update_effective_affinity(data, cpumask_of(cpu));
@@ -976,13 +967,13 @@ static void __unbind_from_irq(unsigned int irq)
}
if (VALID_EVTCHN(evtchn)) {
- unsigned int cpu = cpu_from_irq(irq);
+ unsigned int cpu = info->cpu;
struct xenbus_device *dev;
if (!info->is_static)
xen_evtchn_close(evtchn);
- switch (type_from_irq(irq)) {
+ switch (info->type) {
case IRQT_VIRQ:
per_cpu(virq_to_irq, cpu)[virq_from_irq(irq)] = -1;
break;
@@ -1181,15 +1172,16 @@ static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip,
{
int irq;
int ret;
+ struct irq_info *info;
if (evtchn >= xen_evtchn_max_channels())
return -ENOMEM;
mutex_lock(&irq_mapping_update_lock);
- irq = get_evtchn_to_irq(evtchn);
+ info = evtchn_to_info(evtchn);
- if (irq == -1) {
+ if (!info) {
irq = xen_allocate_irq_dynamic();
if (irq < 0)
goto out;
@@ -1212,8 +1204,8 @@ static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip,
*/
bind_evtchn_to_cpu(evtchn, 0, false);
} else {
- struct irq_info *info = info_for_irq(irq);
- WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
+ WARN_ON(info->type != IRQT_EVTCHN);
+ irq = info->irq;
}
out:
@@ -1551,13 +1543,7 @@ EXPORT_SYMBOL_GPL(xen_set_irq_priority);
int evtchn_make_refcounted(evtchn_port_t evtchn, bool is_static)
{
- int irq = get_evtchn_to_irq(evtchn);
- struct irq_info *info;
-
- if (irq == -1)
- return -ENOENT;
-
- info = info_for_irq(irq);
+ struct irq_info *info = evtchn_to_info(evtchn);
if (!info)
return -ENOENT;
@@ -1573,7 +1559,6 @@ EXPORT_SYMBOL_GPL(evtchn_make_refcounted);
int evtchn_get(evtchn_port_t evtchn)
{
- int irq;
struct irq_info *info;
int err = -ENOENT;
@@ -1582,11 +1567,7 @@ int evtchn_get(evtchn_port_t evtchn)
mutex_lock(&irq_mapping_update_lock);
- irq = get_evtchn_to_irq(evtchn);
- if (irq == -1)
- goto done;
-
- info = info_for_irq(irq);
+ info = evtchn_to_info(evtchn);
if (!info)
goto done;
@@ -1606,10 +1587,11 @@ EXPORT_SYMBOL_GPL(evtchn_get);
void evtchn_put(evtchn_port_t evtchn)
{
- int irq = get_evtchn_to_irq(evtchn);
- if (WARN_ON(irq == -1))
+ struct irq_info *info = evtchn_to_info(evtchn);
+
+ if (WARN_ON(!info))
return;
- unbind_from_irq(irq);
+ unbind_from_irq(info->irq);
}
EXPORT_SYMBOL_GPL(evtchn_put);
@@ -1639,12 +1621,10 @@ struct evtchn_loop_ctrl {
void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl)
{
- int irq;
- struct irq_info *info;
+ struct irq_info *info = evtchn_to_info(port);
struct xenbus_device *dev;
- irq = get_evtchn_to_irq(port);
- if (irq == -1)
+ if (!info)
return;
/*
@@ -1669,7 +1649,6 @@ void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl)
}
}
- info = info_for_irq(irq);
if (xchg_acquire(&info->is_active, 1))
return;
@@ -1683,7 +1662,7 @@ void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl)
info->eoi_time = get_jiffies_64() + event_eoi_delay;
}
- generic_handle_irq(irq);
+ generic_handle_irq(info->irq);
}
int xen_evtchn_do_upcall(void)
@@ -1741,7 +1720,7 @@ void rebind_evtchn_irq(evtchn_port_t evtchn, int irq)
mutex_lock(&irq_mapping_update_lock);
/* After resume the irq<->evtchn mappings are all cleared out */
- BUG_ON(get_evtchn_to_irq(evtchn) != -1);
+ BUG_ON(evtchn_to_info(evtchn));
/* Expect irq to have been bound before,
so there should be a proper type */
BUG_ON(info->type == IRQT_UNBOUND);
--
2.35.3
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