[Patch V1 4/6] genirq: Provide default callbacks for msi_domain_ops
From: Jiang Liu
Date: Thu Nov 13 2014 - 06:41:21 EST
Extend struct msi_domain_info and provide default callbacks for
msi_domain_ops.
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
include/linux/msi.h | 26 +++++++++++---
kernel/irq/msi.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 111 insertions(+), 8 deletions(-)
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 6b356a1410b2..c62a1ca71241 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -121,13 +121,15 @@ typedef struct msi_alloc_info msi_alloc_info_t;
struct msi_domain_ops {
/* Callbacks for msi_create_irq_domain() */
- void (*calc_hwirq)(struct msi_domain_info *info, void *arg,
+ void (*calc_hwirq)(struct msi_domain_info *info,
+ msi_alloc_info_t *arg,
struct msi_desc *desc);
- irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info, void *arg);
+ irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info,
+ msi_alloc_info_t *arg);
int (*msi_init)(struct irq_domain *domain,
struct msi_domain_info *info,
unsigned int virq, irq_hw_number_t hwirq,
- void *arg);
+ msi_alloc_info_t *arg);
void (*msi_free)(struct irq_domain *domain,
struct msi_domain_info *info,
unsigned int virq);
@@ -147,15 +149,29 @@ struct msi_domain_ops {
};
struct msi_domain_info {
+ u32 flags;
struct msi_domain_ops *ops;
struct irq_chip *chip;
- void *data;
+ void *chip_data; /* optional chip data */
+ void *handler; /* optional flow handler */
+ void *handler_data; /* optional handler data */
+ const char *handler_name; /* optional handler name */
+ void *data; /* optional private data */
};
+/* Use default MSI domain ops if possible */
+#define MSI_FLAG_USE_DEF_OPS 0x1
+/* Build identity map between hwirq and irq */
+#define MSI_FLAG_IDENTITY_MAP 0x2
+/* Support multiple PCI MSI interrupts */
+#define MSI_FLAG_MULTI_PCI_MSI 0x4
+/* Support PCI MSIX interrupts */
+#define MSI_FLAG_PCI_MSIX 0x8
+
int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
bool force);
-struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
+struct irq_domain *msi_create_irq_domain(struct device_node *node,
struct msi_domain_info *info,
struct irq_domain *parent);
int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev);
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 0b6665de3a60..5512aa155a50 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -9,6 +9,8 @@
* This file contains common code to support Message Signalled Interrupt for
* PCI compatible and non PCI compatible devices.
*/
+#include <linux/types.h>
+#include <linux/device.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
@@ -114,13 +116,94 @@ static struct irq_domain_ops msi_domain_ops = {
.deactivate = msi_domain_deactivate,
};
-struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
+#ifndef msi_alloc_info_t
+static irq_hw_number_t msi_domain_ops_get_hwirq(struct msi_domain_info *info,
+ struct msi_alloc_info *arg)
+{
+ return arg->hwirq;
+}
+
+static int msi_domain_ops_prepare(struct irq_domain *domain, struct device *dev,
+ struct msi_alloc_info *arg)
+{
+ memset(arg, 0, sizeof(*arg));
+
+ return 0;
+}
+
+static void msi_domain_ops_set_desc(struct msi_alloc_info *arg,
+ struct msi_desc *desc)
+{
+ arg->desc = desc;
+}
+#else
+#define msi_domain_ops_get_hwirq NULL
+#define msi_domain_ops_prepare NULL
+#define msi_domain_ops_set_desc NULL
+#endif /* msi_alloc_info_t */
+
+static int msi_domain_ops_init(struct irq_domain *domain,
+ struct msi_domain_info *info,
+ unsigned int virq, irq_hw_number_t hwirq,
+ msi_alloc_info_t *arg)
+{
+ irq_domain_set_hwirq_and_chip(domain, virq, hwirq, info->chip,
+ info->chip_data);
+ if (info->handler && info->handler_name) {
+ __irq_set_handler(virq, info->handler, 0, info->handler_name);
+ if (info->handler_data)
+ irq_set_handler_data(virq, info->handler_data);
+ }
+
+ return 0;
+}
+
+static int msi_domain_ops_check(struct irq_domain *domain,
+ struct msi_domain_info *info,
+ struct device *dev)
+{
+ return 0;
+}
+
+static struct msi_domain_ops msi_domain_ops_default = {
+ .get_hwirq = msi_domain_ops_get_hwirq,
+ .msi_init = msi_domain_ops_init,
+ .msi_check = msi_domain_ops_check,
+ .msi_prepare = msi_domain_ops_prepare,
+ .set_desc = msi_domain_ops_set_desc,
+};
+
+static void msi_domain_update_ops(struct msi_domain_info *info)
+{
+ struct msi_domain_ops *ops = info->ops;
+
+ if (ops == NULL) {
+ info->ops = &msi_domain_ops_default;
+ return;
+ }
+
+ if (ops->get_hwirq == NULL)
+ ops->get_hwirq = msi_domain_ops_default.get_hwirq;
+ if (ops->msi_init == NULL)
+ ops->msi_init = msi_domain_ops_default.msi_init;
+ if (ops->msi_check == NULL)
+ ops->msi_check = msi_domain_ops_default.msi_check;
+ if (ops->msi_prepare == NULL)
+ ops->msi_prepare = msi_domain_ops_default.msi_prepare;
+ if (ops->set_desc == NULL)
+ ops->set_desc = msi_domain_ops_default.set_desc;
+}
+
+struct irq_domain *msi_create_irq_domain(struct device_node *node,
struct msi_domain_info *info,
struct irq_domain *parent)
{
struct irq_domain *domain;
- domain = irq_domain_add_tree(of_node, &msi_domain_ops, info);
+ if (info->flags & MSI_FLAG_USE_DEF_OPS)
+ msi_domain_update_ops(info);
+
+ domain = irq_domain_add_tree(node, &msi_domain_ops, info);
if (domain)
domain->parent = parent;
@@ -143,8 +226,12 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev)
for_each_msi_entry(desc, dev) {
ops->set_desc(&arg, desc);
+ if (info->flags & MSI_FLAG_IDENTITY_MAP)
+ virq = (int)ops->get_hwirq(info, &arg);
+ else
+ virq = -1;
- virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,
+ virq = __irq_domain_alloc_irqs(domain, virq, desc->nvec_used,
dev_to_node(dev), &arg, false);
if (virq < 0) {
ret = -ENOSPC;
--
1.7.10.4
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