Messages in this thread Patch in this message | | | From | Mike Qiu <> | Subject | [PATCH 1/3] irq: Set multiple MSI descriptor data for multiple IRQs | Date | Tue, 15 Jan 2013 15:38:54 +0800 |
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Multiple MSI only requires the IRQ in msi_desc entry to be set as the value of irq_base.
This patch implements the above mentioned technique.
Signed-off-by: Mike Qiu <qiudayu@linux.vnet.ibm.com> --- include/linux/irq.h | 2 ++ kernel/irq/chip.c | 40 ++++++++++++++++++++++++++++++---------- 2 files changed, 32 insertions(+), 10 deletions(-)
diff --git a/include/linux/irq.h b/include/linux/irq.h index fdf2c4a..60ef45b 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -528,6 +528,8 @@ extern int irq_set_handler_data(unsigned int irq, void *data); extern int irq_set_chip_data(unsigned int irq, void *data); extern int irq_set_irq_type(unsigned int irq, unsigned int type); extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry); +extern int irq_set_multiple_msi_desc(unsigned int irq_base, unsigned int nvec, + struct msi_desc *entry); extern struct irq_data *irq_get_irq_data(unsigned int irq); static inline struct irq_chip *irq_get_chip(unsigned int irq) diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 3aca9f2..c4c39d3 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -90,6 +90,35 @@ int irq_set_handler_data(unsigned int irq, void *data) EXPORT_SYMBOL(irq_set_handler_data); /** + * irq_set_multiple_msi_desc - set Multiple MSI descriptor data + * for multiple IRQs + * @irq_base: Interrupt number base + * @nvec: The number of interrupts + * @entry: Pointer to MSI descriptor data + * + * Set IRQ descriptors for multiple MSIs + */ +int irq_set_multiple_msi_desc(unsigned int irq_base, unsigned int nvec, + struct msi_desc *entry) +{ + unsigned long flags, i; + struct irq_desc *desc; + + for (i = 0; i < nvec; i++) { + desc = irq_get_desc_lock(irq_base + i, &flags, + IRQ_GET_DESC_CHECK_GLOBAL); + if (!desc) + return -EINVAL; + desc->irq_data.msi_desc = entry; + if (i == 0 && entry) + entry->irq = irq_base; + irq_put_desc_unlock(desc, flags); + } + + return 0; +} + +/** * irq_set_msi_desc - set MSI descriptor data for an irq * @irq: Interrupt number * @entry: Pointer to MSI descriptor data @@ -98,16 +127,7 @@ EXPORT_SYMBOL(irq_set_handler_data); */ int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry) { - unsigned long flags; - struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); - - if (!desc) - return -EINVAL; - desc->irq_data.msi_desc = entry; - if (entry) - entry->irq = irq; - irq_put_desc_unlock(desc, flags); - return 0; + return irq_set_multiple_msi_desc(irq, 1, entry); } /** -- 1.7.7.6
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