diff mbox

[V1,3/6] genirq: Introduce msi_irq_domain_{alloc|free}_irqs()

Message ID 1415879029-20098-5-git-send-email-jiang.liu@linux.intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jiang Liu Nov. 13, 2014, 11:43 a.m. UTC
Introduce msi_irq_domain_{alloc|free}_irqs() to alloc/free interrupts
from irqdomain for generic MSI interrupts.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
---
 include/linux/msi.h |   35 ++++++++++++++++++++++++++++++
 kernel/irq/msi.c    |   59 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 94 insertions(+)

Comments

Yijing Wang Nov. 13, 2014, 12:34 p.m. UTC | #1
Gerry, this patch seems to be the same as last one.


On 2014/11/13 19:43, Jiang Liu wrote:
> Introduce msi_irq_domain_{alloc|free}_irqs() to alloc/free interrupts
> from irqdomain for generic MSI interrupts.
> 
> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
> ---
>  include/linux/msi.h |   35 ++++++++++++++++++++++++++++++
>  kernel/irq/msi.c    |   59 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 94 insertions(+)
> 
> diff --git a/include/linux/msi.h b/include/linux/msi.h
> index 714716a3ffdd..6b356a1410b2 100644
> --- a/include/linux/msi.h
> +++ b/include/linux/msi.h
> @@ -3,6 +3,7 @@
>  
>  #include <linux/kobject.h>
>  #include <linux/list.h>
> +#include <asm/hw_irq.h>		/* for msi_alloc_info_t */
>  
>  struct msi_msg {
>  	u32	address_lo;	/* low 32 bits of msi message address */
> @@ -100,7 +101,26 @@ struct irq_chip;
>  struct device_node;
>  struct msi_domain_info;
>  
> +#ifndef NUM_MSI_ALLOC_SCRATCHPAD_REGS
> +#define NUM_MSI_ALLOC_SCRATCHPAD_REGS	2
> +#endif
> +
> +/*
> + * Default structure for MSI interrupt allocation.
> + * Arch may overwrite it by define msi_alloc_info_t.
> + */
> +struct msi_alloc_info {
> +	struct msi_desc *desc;
> +	irq_hw_number_t hwirq;
> +	long		scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS];
> +};
> +
> +#ifndef msi_alloc_info_t
> +typedef struct msi_alloc_info msi_alloc_info_t;
> +#endif
> +
>  struct msi_domain_ops {
> +	/* Callbacks for msi_create_irq_domain() */
>  	void		(*calc_hwirq)(struct msi_domain_info *info, void *arg,
>  				      struct msi_desc *desc);
>  	irq_hw_number_t	(*get_hwirq)(struct msi_domain_info *info, void *arg);
> @@ -111,6 +131,19 @@ struct msi_domain_ops {
>  	void		(*msi_free)(struct irq_domain *domain,
>  				    struct msi_domain_info *info,
>  				    unsigned int virq);
> +
> +	/* Callbacks for msi_irq_domain_alloc_irqs() based on msi_descs */
> +	int		(*msi_check)(struct irq_domain *domain,
> +				     struct msi_domain_info *info,
> +				     struct device *dev);
> +	int		(*msi_prepare)(struct irq_domain *domain,
> +				       struct device *dev,
> +				       msi_alloc_info_t *arg);
> +	void		(*msi_finish)(msi_alloc_info_t *arg, int retval);
> +	void		(*set_desc)(msi_alloc_info_t *arg,
> +				    struct msi_desc *desc);
> +	int		(*handle_error)(struct irq_domain *domain,
> +					struct msi_desc *desc, int error);
>  };
>  
>  struct msi_domain_info {
> @@ -125,6 +158,8 @@ int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
>  struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
>  					 struct msi_domain_info *info,
>  					 struct irq_domain *parent);
> +int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev);
> +void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
>  struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
>  
>  #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
> diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
> index 94d6d87ee23e..0b6665de3a60 100644
> --- a/kernel/irq/msi.c
> +++ b/kernel/irq/msi.c
> @@ -13,6 +13,9 @@
>  #include <linux/irqdomain.h>
>  #include <linux/msi.h>
>  
> +/* Temparory solution for building, will be removed later */
> +#include <linux/pci.h>
> +
>  void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
>  {
>  	*msg = entry->msg;
> @@ -124,6 +127,62 @@ struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
>  	return domain;
>  }
>  
> +int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev)
> +{
> +	int i, ret, virq = -1;
> +	msi_alloc_info_t arg;
> +	struct msi_desc *desc;
> +	struct msi_domain_info *info = domain->host_data;
> +	struct msi_domain_ops *ops = info->ops;
> +
> +	ret = ops->msi_check(domain, info, dev);
> +	if (ret == 0)
> +		ret = ops->msi_prepare(domain, dev, &arg);
> +	if (ret)
> +		return ret;
> +
> +	for_each_msi_entry(desc, dev) {
> +		ops->set_desc(&arg, desc);
> +
> +		virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,
> +					       dev_to_node(dev), &arg, false);
> +		if (virq < 0) {
> +			ret = -ENOSPC;
> +			if (ops->handle_error)
> +				ret = ops->handle_error(domain, desc, ret);
> +			if (ops->msi_finish)
> +				ops->msi_finish(&arg, ret);
> +			return ret;
> +		}
> +
> +		for (i = 0; i < desc->nvec_used; i++)
> +			irq_set_msi_desc_off(virq, i, desc);
> +	}
> +
> +	if (ops->msi_finish)
> +		ops->msi_finish(&arg, 0);
> +
> +	for_each_msi_entry(desc, dev) {
> +		if (desc->nvec_used == 1)
> +			dev_dbg(dev, "irq %d for MSI\n", virq);
> +		else
> +			dev_dbg(dev, "irq [%d-%d] for MSI\n",
> +				virq, virq + desc->nvec_used - 1);
> +	}
> +
> +	return 0;
> +}
> +
> +void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
> +{
> +	struct msi_desc *desc;
> +
> +	for_each_msi_entry(desc, dev) {
> +		irq_domain_free_irqs(desc->irq, desc->nvec_used);
> +		desc->irq = 0;
> +	}
> +}
> +
>  struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain)
>  {
>  	return (struct msi_domain_info *)domain->host_data;
>
Jiang Liu Nov. 13, 2014, 12:41 p.m. UTC | #2
On 2014/11/13 20:34, Yijing Wang wrote:
> Gerry, this patch seems to be the same as last one.
Do you means patch 6/6? They are different:)

> 
> 
> On 2014/11/13 19:43, Jiang Liu wrote:
>> Introduce msi_irq_domain_{alloc|free}_irqs() to alloc/free interrupts
>> from irqdomain for generic MSI interrupts.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
>> ---
>>  include/linux/msi.h |   35 ++++++++++++++++++++++++++++++
>>  kernel/irq/msi.c    |   59 +++++++++++++++++++++++++++++++++++++++++++++++++++
>>  2 files changed, 94 insertions(+)
>>
>> diff --git a/include/linux/msi.h b/include/linux/msi.h
>> index 714716a3ffdd..6b356a1410b2 100644
>> --- a/include/linux/msi.h
>> +++ b/include/linux/msi.h
>> @@ -3,6 +3,7 @@
>>  
>>  #include <linux/kobject.h>
>>  #include <linux/list.h>
>> +#include <asm/hw_irq.h>		/* for msi_alloc_info_t */
>>  
>>  struct msi_msg {
>>  	u32	address_lo;	/* low 32 bits of msi message address */
>> @@ -100,7 +101,26 @@ struct irq_chip;
>>  struct device_node;
>>  struct msi_domain_info;
>>  
>> +#ifndef NUM_MSI_ALLOC_SCRATCHPAD_REGS
>> +#define NUM_MSI_ALLOC_SCRATCHPAD_REGS	2
>> +#endif
>> +
>> +/*
>> + * Default structure for MSI interrupt allocation.
>> + * Arch may overwrite it by define msi_alloc_info_t.
>> + */
>> +struct msi_alloc_info {
>> +	struct msi_desc *desc;
>> +	irq_hw_number_t hwirq;
>> +	long		scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS];
>> +};
>> +
>> +#ifndef msi_alloc_info_t
>> +typedef struct msi_alloc_info msi_alloc_info_t;
>> +#endif
>> +
>>  struct msi_domain_ops {
>> +	/* Callbacks for msi_create_irq_domain() */
>>  	void		(*calc_hwirq)(struct msi_domain_info *info, void *arg,
>>  				      struct msi_desc *desc);
>>  	irq_hw_number_t	(*get_hwirq)(struct msi_domain_info *info, void *arg);
>> @@ -111,6 +131,19 @@ struct msi_domain_ops {
>>  	void		(*msi_free)(struct irq_domain *domain,
>>  				    struct msi_domain_info *info,
>>  				    unsigned int virq);
>> +
>> +	/* Callbacks for msi_irq_domain_alloc_irqs() based on msi_descs */
>> +	int		(*msi_check)(struct irq_domain *domain,
>> +				     struct msi_domain_info *info,
>> +				     struct device *dev);
>> +	int		(*msi_prepare)(struct irq_domain *domain,
>> +				       struct device *dev,
>> +				       msi_alloc_info_t *arg);
>> +	void		(*msi_finish)(msi_alloc_info_t *arg, int retval);
>> +	void		(*set_desc)(msi_alloc_info_t *arg,
>> +				    struct msi_desc *desc);
>> +	int		(*handle_error)(struct irq_domain *domain,
>> +					struct msi_desc *desc, int error);
>>  };
>>  
>>  struct msi_domain_info {
>> @@ -125,6 +158,8 @@ int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
>>  struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
>>  					 struct msi_domain_info *info,
>>  					 struct irq_domain *parent);
>> +int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev);
>> +void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
>>  struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
>>  
>>  #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
>> diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
>> index 94d6d87ee23e..0b6665de3a60 100644
>> --- a/kernel/irq/msi.c
>> +++ b/kernel/irq/msi.c
>> @@ -13,6 +13,9 @@
>>  #include <linux/irqdomain.h>
>>  #include <linux/msi.h>
>>  
>> +/* Temparory solution for building, will be removed later */
>> +#include <linux/pci.h>
>> +
>>  void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
>>  {
>>  	*msg = entry->msg;
>> @@ -124,6 +127,62 @@ struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
>>  	return domain;
>>  }
>>  
>> +int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev)
>> +{
>> +	int i, ret, virq = -1;
>> +	msi_alloc_info_t arg;
>> +	struct msi_desc *desc;
>> +	struct msi_domain_info *info = domain->host_data;
>> +	struct msi_domain_ops *ops = info->ops;
>> +
>> +	ret = ops->msi_check(domain, info, dev);
>> +	if (ret == 0)
>> +		ret = ops->msi_prepare(domain, dev, &arg);
>> +	if (ret)
>> +		return ret;
>> +
>> +	for_each_msi_entry(desc, dev) {
>> +		ops->set_desc(&arg, desc);
>> +
>> +		virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,
>> +					       dev_to_node(dev), &arg, false);
>> +		if (virq < 0) {
>> +			ret = -ENOSPC;
>> +			if (ops->handle_error)
>> +				ret = ops->handle_error(domain, desc, ret);
>> +			if (ops->msi_finish)
>> +				ops->msi_finish(&arg, ret);
>> +			return ret;
>> +		}
>> +
>> +		for (i = 0; i < desc->nvec_used; i++)
>> +			irq_set_msi_desc_off(virq, i, desc);
>> +	}
>> +
>> +	if (ops->msi_finish)
>> +		ops->msi_finish(&arg, 0);
>> +
>> +	for_each_msi_entry(desc, dev) {
>> +		if (desc->nvec_used == 1)
>> +			dev_dbg(dev, "irq %d for MSI\n", virq);
>> +		else
>> +			dev_dbg(dev, "irq [%d-%d] for MSI\n",
>> +				virq, virq + desc->nvec_used - 1);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
>> +{
>> +	struct msi_desc *desc;
>> +
>> +	for_each_msi_entry(desc, dev) {
>> +		irq_domain_free_irqs(desc->irq, desc->nvec_used);
>> +		desc->irq = 0;
>> +	}
>> +}
>> +
>>  struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain)
>>  {
>>  	return (struct msi_domain_info *)domain->host_data;
>>
> 
>
Yijing Wang Nov. 13, 2014, 12:57 p.m. UTC | #3
On 2014/11/13 20:41, Jiang Liu wrote:
> On 2014/11/13 20:34, Yijing Wang wrote:
>> Gerry, this patch seems to be the same as last one.
> Do you means patch 6/6? They are different:)

Oh, it's not the patch problem, I received two double patch.

> 
>>
>>
>> On 2014/11/13 19:43, Jiang Liu wrote:
>>> Introduce msi_irq_domain_{alloc|free}_irqs() to alloc/free interrupts
>>> from irqdomain for generic MSI interrupts.
>>>
>>> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
>>> ---
>>>  include/linux/msi.h |   35 ++++++++++++++++++++++++++++++
>>>  kernel/irq/msi.c    |   59 +++++++++++++++++++++++++++++++++++++++++++++++++++
>>>  2 files changed, 94 insertions(+)
>>>
>>> diff --git a/include/linux/msi.h b/include/linux/msi.h
>>> index 714716a3ffdd..6b356a1410b2 100644
>>> --- a/include/linux/msi.h
>>> +++ b/include/linux/msi.h
>>> @@ -3,6 +3,7 @@
>>>  
>>>  #include <linux/kobject.h>
>>>  #include <linux/list.h>
>>> +#include <asm/hw_irq.h>		/* for msi_alloc_info_t */
>>>  
>>>  struct msi_msg {
>>>  	u32	address_lo;	/* low 32 bits of msi message address */
>>> @@ -100,7 +101,26 @@ struct irq_chip;
>>>  struct device_node;
>>>  struct msi_domain_info;
>>>  
>>> +#ifndef NUM_MSI_ALLOC_SCRATCHPAD_REGS
>>> +#define NUM_MSI_ALLOC_SCRATCHPAD_REGS	2
>>> +#endif
>>> +
>>> +/*
>>> + * Default structure for MSI interrupt allocation.
>>> + * Arch may overwrite it by define msi_alloc_info_t.
>>> + */
>>> +struct msi_alloc_info {
>>> +	struct msi_desc *desc;
>>> +	irq_hw_number_t hwirq;
>>> +	long		scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS];
>>> +};
>>> +
>>> +#ifndef msi_alloc_info_t
>>> +typedef struct msi_alloc_info msi_alloc_info_t;
>>> +#endif
>>> +
>>>  struct msi_domain_ops {
>>> +	/* Callbacks for msi_create_irq_domain() */
>>>  	void		(*calc_hwirq)(struct msi_domain_info *info, void *arg,
>>>  				      struct msi_desc *desc);
>>>  	irq_hw_number_t	(*get_hwirq)(struct msi_domain_info *info, void *arg);
>>> @@ -111,6 +131,19 @@ struct msi_domain_ops {
>>>  	void		(*msi_free)(struct irq_domain *domain,
>>>  				    struct msi_domain_info *info,
>>>  				    unsigned int virq);
>>> +
>>> +	/* Callbacks for msi_irq_domain_alloc_irqs() based on msi_descs */
>>> +	int		(*msi_check)(struct irq_domain *domain,
>>> +				     struct msi_domain_info *info,
>>> +				     struct device *dev);
>>> +	int		(*msi_prepare)(struct irq_domain *domain,
>>> +				       struct device *dev,
>>> +				       msi_alloc_info_t *arg);
>>> +	void		(*msi_finish)(msi_alloc_info_t *arg, int retval);
>>> +	void		(*set_desc)(msi_alloc_info_t *arg,
>>> +				    struct msi_desc *desc);
>>> +	int		(*handle_error)(struct irq_domain *domain,
>>> +					struct msi_desc *desc, int error);
>>>  };
>>>  
>>>  struct msi_domain_info {
>>> @@ -125,6 +158,8 @@ int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
>>>  struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
>>>  					 struct msi_domain_info *info,
>>>  					 struct irq_domain *parent);
>>> +int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev);
>>> +void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
>>>  struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
>>>  
>>>  #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
>>> diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
>>> index 94d6d87ee23e..0b6665de3a60 100644
>>> --- a/kernel/irq/msi.c
>>> +++ b/kernel/irq/msi.c
>>> @@ -13,6 +13,9 @@
>>>  #include <linux/irqdomain.h>
>>>  #include <linux/msi.h>
>>>  
>>> +/* Temparory solution for building, will be removed later */
>>> +#include <linux/pci.h>
>>> +
>>>  void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
>>>  {
>>>  	*msg = entry->msg;
>>> @@ -124,6 +127,62 @@ struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
>>>  	return domain;
>>>  }
>>>  
>>> +int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev)
>>> +{
>>> +	int i, ret, virq = -1;
>>> +	msi_alloc_info_t arg;
>>> +	struct msi_desc *desc;
>>> +	struct msi_domain_info *info = domain->host_data;
>>> +	struct msi_domain_ops *ops = info->ops;
>>> +
>>> +	ret = ops->msi_check(domain, info, dev);
>>> +	if (ret == 0)
>>> +		ret = ops->msi_prepare(domain, dev, &arg);
>>> +	if (ret)
>>> +		return ret;
>>> +
>>> +	for_each_msi_entry(desc, dev) {
>>> +		ops->set_desc(&arg, desc);
>>> +
>>> +		virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,
>>> +					       dev_to_node(dev), &arg, false);
>>> +		if (virq < 0) {
>>> +			ret = -ENOSPC;
>>> +			if (ops->handle_error)
>>> +				ret = ops->handle_error(domain, desc, ret);
>>> +			if (ops->msi_finish)
>>> +				ops->msi_finish(&arg, ret);
>>> +			return ret;
>>> +		}
>>> +
>>> +		for (i = 0; i < desc->nvec_used; i++)
>>> +			irq_set_msi_desc_off(virq, i, desc);
>>> +	}
>>> +
>>> +	if (ops->msi_finish)
>>> +		ops->msi_finish(&arg, 0);
>>> +
>>> +	for_each_msi_entry(desc, dev) {
>>> +		if (desc->nvec_used == 1)
>>> +			dev_dbg(dev, "irq %d for MSI\n", virq);
>>> +		else
>>> +			dev_dbg(dev, "irq [%d-%d] for MSI\n",
>>> +				virq, virq + desc->nvec_used - 1);
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
>>> +{
>>> +	struct msi_desc *desc;
>>> +
>>> +	for_each_msi_entry(desc, dev) {
>>> +		irq_domain_free_irqs(desc->irq, desc->nvec_used);
>>> +		desc->irq = 0;
>>> +	}
>>> +}
>>> +
>>>  struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain)
>>>  {
>>>  	return (struct msi_domain_info *)domain->host_data;
>>>
>>
>>
> 
> .
>
diff mbox

Patch

diff --git a/include/linux/msi.h b/include/linux/msi.h
index 714716a3ffdd..6b356a1410b2 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -3,6 +3,7 @@ 
 
 #include <linux/kobject.h>
 #include <linux/list.h>
+#include <asm/hw_irq.h>		/* for msi_alloc_info_t */
 
 struct msi_msg {
 	u32	address_lo;	/* low 32 bits of msi message address */
@@ -100,7 +101,26 @@  struct irq_chip;
 struct device_node;
 struct msi_domain_info;
 
+#ifndef NUM_MSI_ALLOC_SCRATCHPAD_REGS
+#define NUM_MSI_ALLOC_SCRATCHPAD_REGS	2
+#endif
+
+/*
+ * Default structure for MSI interrupt allocation.
+ * Arch may overwrite it by define msi_alloc_info_t.
+ */
+struct msi_alloc_info {
+	struct msi_desc *desc;
+	irq_hw_number_t hwirq;
+	long		scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS];
+};
+
+#ifndef msi_alloc_info_t
+typedef struct msi_alloc_info msi_alloc_info_t;
+#endif
+
 struct msi_domain_ops {
+	/* Callbacks for msi_create_irq_domain() */
 	void		(*calc_hwirq)(struct msi_domain_info *info, void *arg,
 				      struct msi_desc *desc);
 	irq_hw_number_t	(*get_hwirq)(struct msi_domain_info *info, void *arg);
@@ -111,6 +131,19 @@  struct msi_domain_ops {
 	void		(*msi_free)(struct irq_domain *domain,
 				    struct msi_domain_info *info,
 				    unsigned int virq);
+
+	/* Callbacks for msi_irq_domain_alloc_irqs() based on msi_descs */
+	int		(*msi_check)(struct irq_domain *domain,
+				     struct msi_domain_info *info,
+				     struct device *dev);
+	int		(*msi_prepare)(struct irq_domain *domain,
+				       struct device *dev,
+				       msi_alloc_info_t *arg);
+	void		(*msi_finish)(msi_alloc_info_t *arg, int retval);
+	void		(*set_desc)(msi_alloc_info_t *arg,
+				    struct msi_desc *desc);
+	int		(*handle_error)(struct irq_domain *domain,
+					struct msi_desc *desc, int error);
 };
 
 struct msi_domain_info {
@@ -125,6 +158,8 @@  int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
 struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
 					 struct msi_domain_info *info,
 					 struct irq_domain *parent);
+int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev);
+void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
 struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
 
 #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 94d6d87ee23e..0b6665de3a60 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -13,6 +13,9 @@ 
 #include <linux/irqdomain.h>
 #include <linux/msi.h>
 
+/* Temparory solution for building, will be removed later */
+#include <linux/pci.h>
+
 void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
 {
 	*msg = entry->msg;
@@ -124,6 +127,62 @@  struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
 	return domain;
 }
 
+int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev)
+{
+	int i, ret, virq = -1;
+	msi_alloc_info_t arg;
+	struct msi_desc *desc;
+	struct msi_domain_info *info = domain->host_data;
+	struct msi_domain_ops *ops = info->ops;
+
+	ret = ops->msi_check(domain, info, dev);
+	if (ret == 0)
+		ret = ops->msi_prepare(domain, dev, &arg);
+	if (ret)
+		return ret;
+
+	for_each_msi_entry(desc, dev) {
+		ops->set_desc(&arg, desc);
+
+		virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,
+					       dev_to_node(dev), &arg, false);
+		if (virq < 0) {
+			ret = -ENOSPC;
+			if (ops->handle_error)
+				ret = ops->handle_error(domain, desc, ret);
+			if (ops->msi_finish)
+				ops->msi_finish(&arg, ret);
+			return ret;
+		}
+
+		for (i = 0; i < desc->nvec_used; i++)
+			irq_set_msi_desc_off(virq, i, desc);
+	}
+
+	if (ops->msi_finish)
+		ops->msi_finish(&arg, 0);
+
+	for_each_msi_entry(desc, dev) {
+		if (desc->nvec_used == 1)
+			dev_dbg(dev, "irq %d for MSI\n", virq);
+		else
+			dev_dbg(dev, "irq [%d-%d] for MSI\n",
+				virq, virq + desc->nvec_used - 1);
+	}
+
+	return 0;
+}
+
+void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
+{
+	struct msi_desc *desc;
+
+	for_each_msi_entry(desc, dev) {
+		irq_domain_free_irqs(desc->irq, desc->nvec_used);
+		desc->irq = 0;
+	}
+}
+
 struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain)
 {
 	return (struct msi_domain_info *)domain->host_data;