Messages in this thread Patch in this message | | | Date | Fri, 3 Nov 2006 14:46:30 -0700 | From | (Eric W. Biederman) | Subject | [RFC][PATCH 2/2] htirq: Allow buggy drivers of buggy hardware to write the registers. |
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Cc olson@pathscale.com, <linux-kernel@vger.kernel.org> Date: Fri, 03 Nov 2006 14:46:30 -0700 Message-ID: <m1ejskurt5.fsf_-_@ebiederm.dsl.xmission.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii
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.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> --- drivers/pci/htirq.c | 46 +++++++++++++++++++++++++++++++++------------- include/linux/htirq.h | 4 ++++ 2 files changed, 37 insertions(+), 13 deletions(-)
diff --git a/drivers/pci/htirq.c b/drivers/pci/htirq.c index e346fe3..6ed53c5 100644 --- a/drivers/pci/htirq.c +++ b/drivers/pci/htirq.c @@ -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; @@ -36,14 +38,17 @@ void write_ht_irq_msg(unsigned int irq, struct ht_irq_cfg *cfg = get_irq_data(irq); unsigned long flags; spin_lock_irqsave(&ht_irq_lock, flags); - if (cfg->msg.address_lo != msg->address_lo) { - pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx); - pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_lo); - } - if (cfg->msg.address_hi != msg->address_hi) { - 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 (!likely(cfg->update)) { + if (cfg->msg.address_lo != msg->address_lo) { + pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx); + pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_lo); + } + if (cfg->msg.address_hi != msg->address_hi) { + pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1); + pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_hi); + } + } else + cfg->update(irq, msg); spin_unlock_irqrestore(&ht_irq_lock, flags); cfg->msg = *msg; } @@ -79,16 +84,14 @@ 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 +126,7 @@ int ht_create_irq(struct pci_dev *dev, i 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. */ @@ -145,6 +149,21 @@ int ht_create_irq(struct pci_dev *dev, i } /** + * 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 * * This reverses ht_create_irq removing the specified irq from @@ -162,5 +181,6 @@ void ht_destroy_irq(unsigned int irq) kfree(cfg); } +EXPORT_SYMBOL(__ht_create_irq); EXPORT_SYMBOL(ht_create_irq); EXPORT_SYMBOL(ht_destroy_irq); diff --git a/include/linux/htirq.h b/include/linux/htirq.h index 108f0d9..8adacc2 100644 --- a/include/linux/htirq.h +++ b/include/linux/htirq.h @@ -15,4 +15,8 @@ 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)(int irq, struct ht_irq_msg *); +int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update); + #endif /* LINUX_HTIRQ_H */ -- 1.4.2.rc3.g7e18e-dirty - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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