Hi Jiang,
On 13/11/14 11:43, Jiang Liu wrote:
> Provide mechanism to directly alloc/free MSI/MSIX interrupt from
> irqdomain, which will be used to replace arch_setup_msi_irq()/
> arch_setup_msi_irqs()/arch_teardown_msi_irq()/arch_teardown_msi_irqs().
>
> To kill weak functions, this patch introduce a new weak function
> arch_get_pci_msi_domain(), which is to retrieve the MSI irqdomain
> for a PCI device. This weak function could be killed once we get
> a common way to associate MSI domain with PCI device.
>
> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
> ---
> drivers/pci/msi.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++----
> include/linux/msi.h | 3 +++
> 2 files changed, 59 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index 0319c21dd208..6f8a2f93187a 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -27,8 +27,41 @@ static int pci_msi_enable = 1;
>
> #define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
>
> -/* Arch hooks */
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +static struct irq_domain *pci_msi_default_domain;
> +
> +struct irq_domain * __weak arch_get_pci_msi_domain(struct pci_dev *dev)
> +{
> + return pci_msi_default_domain;
> +}
> +
> +static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> +{
> + struct irq_domain *domain;
>
> + domain = arch_get_pci_msi_domain(dev);
> + if (domain)
> + return pci_msi_domain_alloc_irqs(domain, type, dev);
> +
> + return arch_setup_msi_irqs(dev, nvec, type);
> +}
> +
> +static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
> +{
> + struct irq_domain *domain;
> +
> + domain = arch_get_pci_msi_domain(dev);
> + if (domain)
> + pci_msi_domain_free_irqs(domain, dev);
> + else
> + arch_teardown_msi_irqs(dev);
> +}
> +#else
> +#define pci_msi_setup_msi_irqs arch_setup_msi_irqs
> +#define pci_msi_teardown_msi_irqs arch_teardown_msi_irqs
> +#endif
> +
> +/* Arch hooks */
> int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
> {
> struct msi_chip *chip = dev->bus->msi;
> @@ -329,7 +362,7 @@ static void free_msi_irqs(struct pci_dev *dev)
> for (i = 0; i < entry->nvec_used; i++)
> BUG_ON(irq_has_action(entry->irq + i));
>
> - arch_teardown_msi_irqs(dev);
> + pci_msi_teardown_msi_irqs(dev);
>
> list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) {
> if (entry->msi_attrib.is_msix) {
> @@ -581,7 +614,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec)
> list_add_tail(&entry->list, &dev->msi_list);
>
> /* Configure MSI capability structure */
> - ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
> + ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
> if (ret) {
> msi_mask_irq(entry, mask, ~mask);
> free_msi_irqs(dev);
> @@ -696,7 +729,7 @@ static int msix_capability_init(struct pci_dev *dev,
> if (ret)
> return ret;
>
> - ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
> + ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
> if (ret)
> goto out_avail;
>
> @@ -1183,4 +1216,23 @@ void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev)
> {
> msi_domain_free_irqs(domain, &dev->dev);
> }
> +
> +struct irq_domain *pci_msi_create_default_irq_domain(struct device_node *node,
> + struct msi_domain_info *info, struct irq_domain *parent)
> +{
> + struct irq_domain *domain;
> + static DEFINE_MUTEX(pci_msi_domain_lock);
> +
> + mutex_lock(&pci_msi_domain_lock);
> + if (pci_msi_default_domain) {
> + pr_err("PCI: default irq domain for PCI MSI has already been created.\n");
> + domain = NULL;
> + } else {
> + domain = msi_create_irq_domain(node, info, parent);
Surely this needs to be a call to pci_msi_create_irq_domain().
Otherwise, not much is working on the PCI side...
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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