Re: [PATCH 1/3] irq: Set multiple MSI descriptor data for multiple IRQs
On Tue, 15 Jan 2013 15:38:54 +0800, Mike Qiu wrote: > 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 Hi Mike, question below... > --- > +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, , > + IRQ_GET_DESC_CHECK_GLOBAL); > + if (!desc) > + return -EINVAL; > + desc->irq_data.msi_desc = entry; > + if (i == 0 && entry) > + entry->irq = irq_base; It's not clear to me why this code only sets the irq value for the first desc. Why don't the other descs in the array want (irq_base + i) here? A comment describing what is going on would be appropriate and helpful. g. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH 1/3] irq: Set multiple MSI descriptor data for multiple IRQs
On Tue, 15 Jan 2013 15:38:54 +0800, Mike Qiu qiud...@linux.vnet.ibm.com wrote: 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 qiud...@linux.vnet.ibm.com Hi Mike, question below... --- +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; It's not clear to me why this code only sets the irq value for the first desc. Why don't the other descs in the array want (irq_base + i) here? A comment describing what is going on would be appropriate and helpful. g. -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH 1/3] irq: Set multiple MSI descriptor data for multiple IRQs
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 --- 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, , + 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, , 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH 1/3] irq: Set multiple MSI descriptor data for multiple IRQs
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 qiud...@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 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/