diff options
| author | Jiang Liu <jiang.liu@linux.intel.com> | 2014-11-15 22:24:04 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-11-23 13:01:47 +0100 |
| commit | d9109698be6e7439e6082aa00d79d4556114739b (patch) | |
| tree | 58b79edd974b2b6d57bd927375946eed9109c333 /kernel/irq | |
| parent | 926ff9ad76e097011030feaee904395e06eea17a (diff) | |
genirq: Introduce msi_domain_alloc/free_irqs()
Introduce msi_domain_{alloc|free}_irqs() to alloc/free interrupts
from generic MSI irqdomain.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Alexander Gordeev <agordeev@redhat.com>
Link: http://lkml.kernel.org/r/1416061447-9472-7-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/msi.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 5e0cef4741d9..23111aaa06b2 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -13,6 +13,9 @@ #include <linux/irqdomain.h> #include <linux/msi.h> +/* Temparory solution for building, will be removed later */ +#include <linux/pci.h> + #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN /** * msi_domain_set_affinity - Generic affinity setter function for MSI domains @@ -127,6 +130,78 @@ struct irq_domain *msi_create_irq_domain(struct device_node *of_node, } /** + * msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain + * @domain: The domain to allocate from + * @dev: Pointer to device struct of the device for which the interrupts + * are allocated + * @nvec: The number of interrupts to allocate + * + * Returns 0 on success or an error code. + */ +int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, + int nvec) +{ + struct msi_domain_info *info = domain->host_data; + struct msi_domain_ops *ops = info->ops; + msi_alloc_info_t arg; + struct msi_desc *desc; + int i, ret, virq = -1; + + ret = ops->msi_check(domain, info, dev); + if (ret == 0) + ret = ops->msi_prepare(domain, dev, nvec, &arg); + if (ret) + return ret; + + for_each_msi_entry(desc, dev) { + ops->set_desc(&arg, desc); + + virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used, + dev_to_node(dev), &arg, false); + if (virq < 0) { + ret = -ENOSPC; + if (ops->handle_error) + ret = ops->handle_error(domain, desc, ret); + if (ops->msi_finish) + ops->msi_finish(&arg, ret); + return ret; + } + + for (i = 0; i < desc->nvec_used; i++) + irq_set_msi_desc_off(virq, i, desc); + } + + if (ops->msi_finish) + ops->msi_finish(&arg, 0); + + for_each_msi_entry(desc, dev) { + if (desc->nvec_used == 1) + dev_dbg(dev, "irq %d for MSI\n", virq); + else + dev_dbg(dev, "irq [%d-%d] for MSI\n", + virq, virq + desc->nvec_used - 1); + } + + return 0; +} + +/** + * msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated tp @dev + * @domain: The domain to managing the interrupts + * @dev: Pointer to device struct of the device for which the interrupts + * are free + */ +void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev) +{ + struct msi_desc *desc; + + for_each_msi_entry(desc, dev) { + irq_domain_free_irqs(desc->irq, desc->nvec_used); + desc->irq = 0; + } +} + +/** * msi_get_domain_info - Get the MSI interrupt domain info for @domain * @domain: The interrupt domain to retrieve data from * |