From: Mike Qiu <qiudayu@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Cc: tglx@linutronix.de, Mike Qiu <qiudayu@linux.vnet.ibm.com>
Subject: [PATCH 1/3] irq: Set multiple MSI descriptor data for multiple IRQs
Date: Tue, 15 Jan 2013 15:38:54 +0800 [thread overview]
Message-ID: <1358235536-32741-2-git-send-email-qiudayu@linux.vnet.ibm.com> (raw)
In-Reply-To: <1358235536-32741-1-git-send-email-qiudayu@linux.vnet.ibm.com>
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
next prev parent reply other threads:[~2013-01-15 7:39 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-15 7:38 [PATCH 0/3] Enable multiple MSI feature in pSeries Mike Qiu
2013-01-15 7:38 ` Mike Qiu [this message]
2013-06-05 23:03 ` [PATCH 1/3] irq: Set multiple MSI descriptor data for multiple IRQs Grant Likely
2013-01-15 7:38 ` [PATCH 2/3] irq: Add hw continuous IRQs map to virtual continuous IRQs support Mike Qiu
2013-03-05 2:23 ` Michael Ellerman
2013-03-05 7:19 ` Mike Qiu
2013-03-06 3:54 ` Michael Ellerman
2013-03-06 5:34 ` Mike Qiu
2013-03-06 5:42 ` Michael Ellerman
2013-03-06 7:02 ` Mike Qiu
2013-03-05 2:41 ` Paul Mundt
2013-03-05 7:44 ` Mike Qiu
2013-01-15 7:38 ` [PATCH 3/3] powerpc/pci: Enable pSeries multiple MSI feature Mike Qiu
2013-01-31 2:10 ` [PATCH 0/3] Enable multiple MSI feature in pSeries Mike
2013-02-04 3:23 ` Michael Ellerman
2013-02-04 3:49 ` Mike Qiu
2013-02-04 5:56 ` Michael Ellerman
2013-02-04 6:43 ` Mike Qiu
2013-03-01 3:07 ` Mike
2013-03-01 3:08 ` Mike
2013-03-01 3:54 ` Michael Ellerman
2013-03-04 3:14 ` Mike Qiu
2013-03-05 0:28 ` Michael Ellerman
2013-05-21 14:45 ` Alexander Gordeev
2013-05-22 0:15 ` Benjamin Herrenschmidt
2013-05-22 6:16 ` Mike Qiu
2013-05-22 5:57 ` Mike Qiu
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