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* [RFC PATCH] add pci_{request,free}_irq take #3
@ 2006-10-04 19:32 Frederik Deweerdt
  2006-10-04 19:43 ` [RFC PATCH] move aic7xxx to pci_request_irq Frederik Deweerdt
                   ` (4 more replies)
  0 siblings, 5 replies; 15+ messages in thread
From: Frederik Deweerdt @ 2006-10-04 19:32 UTC (permalink / raw)
  To: linux-kernel; +Cc: arjan, matthew, alan, jeff, akpm, rdunlap, gregkh

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,

^ permalink raw reply	[flat|nested] 15+ messages in thread
* [RFC PATCH] add pci_{request,free}_irq take #2
@ 2006-10-03 22:07 Frederik Deweerdt
  2006-10-03 22:23 ` [RFC PATCH] move e1000 to pci_request_irq Frederik Deweerdt
  0 siblings, 1 reply; 15+ messages in thread
From: Frederik Deweerdt @ 2006-10-03 22:07 UTC (permalink / raw)
  To: linux-kernel; +Cc: arjan, matthew, alan, jeff, akpm, rdunlap, gregkh

Hi all,

This is take #2 of the "add pci_{request,free}_irq" patch.
The following changes have been made since last proposal:
- fix broken kerneldoc (Randy Dunlap)
- change warning message (Alan Cox)
- taken into account the various comments made by Matthew Wilcox
- remove the IRQF_SHARED flag from the request_irq() call: not all
  drivers (eg. tg3) set it (Arjan van de Ven suggested dropping it
  before the call, but this may not suit the different usage patterns,
  tg3 in particular)

I'll send a follow-up patch showing the implied modifications for the
following - semi-randomly chosen :) - drivers: aic7xxx, aic79xx, tg3
and e1000 (Dropped the drm one, which was NACKed by the maintainer).

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

PS: trimmed the CC list a bit, this must be noise to linux-scsi
PPS: used quilt to manage patches, I should have done it long ago :)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index a544997..50b49ef 100644
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,
+			   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_PCI_IRQ
+static inline int is_irq_valid(unsigned int irq)
+{
+	return irq ? 1 : 0;
+}
+#endif /* ARCH_VALIDATE_PCI_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,

^ permalink raw reply	[flat|nested] 15+ messages in thread
end of thread, other threads:[~2006-10-06 10:31 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2006-10-04 19:32 [RFC PATCH] add pci_{request,free}_irq take #3 Frederik Deweerdt
2006-10-04 19:43 ` [RFC PATCH] move aic7xxx to pci_request_irq Frederik Deweerdt
2006-10-04 19:44 ` [RFC PATCH] move aic79xx " Frederik Deweerdt
2006-10-04 19:46 ` [RFC PATCH] move tg3 " Frederik Deweerdt
2006-10-04 19:46 ` [RFC PATCH] move e1000 " Frederik Deweerdt
2006-10-04 19:50 ` [RFC PATCH] add pci_{request,free}_irq take #3 Jeff Garzik
2006-10-04 20:29   ` Frederik Deweerdt
2006-10-04 20:33     ` Matthew Wilcox
2006-10-04 21:26       ` Frederik Deweerdt
2006-10-05 13:59         ` Alexey Dobriyan
2006-10-05 14:36           ` Frederik Deweerdt
2006-10-06 10:04             ` Alexey Dobriyan
2006-10-06 10:31               ` Frederik Deweerdt
  -- strict thread matches above, loose matches on Subject: below --
2006-10-03 22:07 [RFC PATCH] add pci_{request,free}_irq take #2 Frederik Deweerdt
2006-10-03 22:23 ` [RFC PATCH] move e1000 to pci_request_irq Frederik Deweerdt
2006-10-03 22:36   ` Jeff Garzik

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