Commit 43539c38 authored by Eric W. Biederman's avatar Eric W. Biederman Committed by Linus Torvalds
Browse files

[PATCH] htirq: allow buggy drivers of buggy hardware to write the registers 



This patch adds a variant of ht_create_irq __ht_create_irq that takes an
aditional parameter update that is a function that is called whenever we want
to write to a drivers htirq configuration registers.

This is needed to support the ipath_iba6110 because it's registers in the
proper location are not actually conected to the hardware that controlls
interrupt delivery.

[bos@serpentine.com: fixes]
Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Cc: Andi Kleen <ak@suse.de>
Cc: <olson@pathscale.com>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: default avatarBryan O'Sullivan <bryan.osullivan@qlogic.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ec68307c

drivers/pci/htirq.c

+24 −5
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ static DEFINE_SPINLOCK(ht_irq_lock); 


struct ht_irq_cfg {

	struct pci_dev *dev;

	 /* Update callback used to cope with buggy hardware */

	ht_irq_update_t *update;

	unsigned pos;

	unsigned idx;

	struct ht_irq_msg msg;
@@ -44,6 +46,8 @@ void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg) 
		pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1);

		pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_hi);

	}

	if (cfg->update)

		cfg->update(cfg->dev, irq, msg);

	spin_unlock_irqrestore(&ht_irq_lock, flags);

	cfg->msg = *msg;

}
@@ -79,16 +83,14 @@ void unmask_ht_irq(unsigned int irq) 
}



/**

 * ht_create_irq - create an irq and attach it to a device.

 * __ht_create_irq - create an irq and attach it to a device.

 * @dev: The hypertransport device to find the irq capability on.

 * @idx: Which of the possible irqs to attach to.

 *

 * ht_create_irq is needs to be called for all hypertransport devices

 * that generate irqs.

 * @update: Function to be called when changing the htirq message

 *

 * The irq number of the new irq or a negative error value is returned.

 */

int ht_create_irq(struct pci_dev *dev, int idx)

int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)

{

	struct ht_irq_cfg *cfg;

	unsigned long flags;
@@ -123,6 +125,7 @@ int ht_create_irq(struct pci_dev *dev, int idx) 
		return -ENOMEM;



	cfg->dev = dev;

	cfg->update = update;

	cfg->pos = pos;

	cfg->idx = 0x10 + (idx * 2);

	/* Initialize msg to a value that will never match the first write. */
@@ -144,6 +147,21 @@ int ht_create_irq(struct pci_dev *dev, int idx) 
	return irq;

}



/**

 * ht_create_irq - create an irq and attach it to a device.

 * @dev: The hypertransport device to find the irq capability on.

 * @idx: Which of the possible irqs to attach to.

 *

 * ht_create_irq needs to be called for all hypertransport devices

 * that generate irqs.

 *

 * The irq number of the new irq or a negative error value is returned.

 */

int ht_create_irq(struct pci_dev *dev, int idx)

{

	return __ht_create_irq(dev, idx, NULL);

}



/**

 * ht_destroy_irq - destroy an irq created with ht_create_irq

 *
@@ -162,5 +180,6 @@ void ht_destroy_irq(unsigned int irq) 
	kfree(cfg);

}



EXPORT_SYMBOL(__ht_create_irq);

EXPORT_SYMBOL(ht_create_irq);

EXPORT_SYMBOL(ht_destroy_irq);

include/linux/htirq.h

+5 −0
Original line number Diff line number Diff line
@@ -15,4 +15,9 @@ void unmask_ht_irq(unsigned int irq); 
/* The arch hook for getting things started */

int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev);



/* For drivers of buggy hardware */

typedef void (ht_irq_update_t)(struct pci_dev *dev, int irq,

			       struct ht_irq_msg *msg);

int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update);



#endif /* LINUX_HTIRQ_H */

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