Hi all,
This is take #3 of the "add pci_{request,free}_irq" patch.
The following changes have been made since last proposal:
- add IRQF_SHARED systematically to the flags parameter. This is safe
even for MSI as seen here: http://lkml.org/lkml/2006/10/4/21
- remove IRQF_SHARED from tg3 and e1000
- s/ARCH_VALIDATE_PCI_IRQ/ARCH_VALIDATE_IRQ/ in
include/linux/interrupts.h, as the irq line may be tweaked outside
the pci subsystem in an arch specific way.
I'll send a follow-up patch showing the implied modifications for the
following drivers: aic7xxx, aic79xx, tg3 and e1000.
Please note that I'm not submitting the driver changes, they're there
only for illustration purposes. I'll CC the appropriate maintainers
when/if an API is agreed upon.
Regards,
Frederik
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index a544997..50b49ef 100644
drivers/pci/pci.c | 42 ++++++++++++++++++++++++++++++++++++++++++
include/linux/interrupt.h | 7 +++++++
include/linux/pci.h | 6 ++++++
3 files changed, 55 insertions(+)
Index: 2.6.18-mm3/drivers/pci/pci.c
===================================================================
--- 2.6.18-mm3.orig/drivers/pci/pci.c
+++ 2.6.18-mm3/drivers/pci/pci.c
@@ -15,6 +15,7 @@
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/spinlock.h>
+#include <linux/interrupt.h>
#include <linux/string.h>
#include <asm/dma.h> /* isa_dma_bridge_buggy */
#include "pci.h"
@@ -810,6 +811,47 @@ err_out:
}
/**
+ * pci_request_irq - Reserve an IRQ for a PCI device
+ * @pdev: The PCI device whose irq is to be reserved
+ * @handler: The interrupt handler function,
+ * @flags: The flags to be passed to request_irq()
+ * @name: The name of the device to be associated with the irq
+ *
+ * Returns 0 on success, or a negative value on error. A warning
+ * message is also printed on failure.
+ * pci_get_drvdata(pdev) shall be passed as an argument to the @handler
+ * function
+ */
+int pci_request_irq(struct pci_dev *pdev,
+ irqreturn_t(*handler) (int, void *, struct pt_regs *),
+ unsigned long flags, const char *name)
+{
+ if (!is_irq_valid(pdev->irq)) {
+ dev_printk(KERN_ERR, &pdev->dev,
+ "No usable irq line was found (got #%d)\n",
+ pdev->irq);
+ return -EINVAL;
+ }
+
+ return request_irq(pdev->irq, handler, flags | IRQF_SHARED,
+ name ? name : pdev->driver->name,
+ pci_get_drvdata(pdev));
+}
+EXPORT_SYMBOL(pci_request_irq);
+
+/**
+ * pci_free_irq - Free an IRQ for a PCI device
+ *
+ * @pdev: the PCI device whose interrupt is to be freed
+ * pci_get_drvdata(pdev) is used as the device identifier
+ */
+void pci_free_irq(struct pci_dev *pdev)
+{
+ free_irq(pdev->irq, pci_get_drvdata(pdev));
+}
+EXPORT_SYMBOL(pci_free_irq);
+
+/**
* pci_set_master - enables bus-mastering for device dev
* @dev: the PCI device to enable
*
Index: 2.6.18-mm3/include/linux/interrupt.h
===================================================================
--- 2.6.18-mm3.orig/include/linux/interrupt.h
+++ 2.6.18-mm3/include/linux/interrupt.h
@@ -75,6 +75,13 @@ struct irqaction {
struct proc_dir_entry *dir;
};
+#ifndef ARCH_VALIDATE_IRQ
+static inline int is_irq_valid(unsigned int irq)
+{
+ return irq ? 1 : 0;
+}
+#endif /* ARCH_VALIDATE_IRQ */
+
extern irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs);
extern int request_irq(unsigned int,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
Index: 2.6.18-mm3/include/linux/pci.h
===================================================================
--- 2.6.18-mm3.orig/include/linux/pci.h
+++ 2.6.18-mm3/include/linux/pci.h
@@ -52,6 +52,7 @@
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/device.h>
+#include <linux/interrupt.h>
/* File state for mmap()s on /proc/bus/pci/X/Y */
enum pci_mmap_state {
@@ -532,6 +533,11 @@ void pci_release_regions(struct pci_dev
int __must_check pci_request_region(struct pci_dev *, int, const char *);
void pci_release_region(struct pci_dev *, int);
+int __must_check pci_request_irq(struct pci_dev *pdev,
+ irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ unsigned long flags, const char *name);
+void pci_free_irq(struct pci_dev *pdev);
+
/* drivers/pci/bus.c */
int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
struct resource *res, resource_size_t size,
-
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