From 1a5aeeecd550ee4344cfba1791f1134739b16dc6 Mon Sep 17 00:00:00 2001 From: Maciej Sosnowski Date: Thu, 10 Sep 2009 15:05:58 +0200 Subject: [PATCH] dca: registering requesters in multiple dca domains This patch enables DCA support on multiple-IOH/multiple-IIO architectures. It modifies dca module by replacing single dca_providers list with dca_domains list, each domain containing separate list of providers. This approach lets dca driver manage multiple domains, i.e. sets of providers and requesters mapped back to the same PCI root complex device. The driver takes care to register each requester to a provider from the same domain. Signed-off-by: Dan Williams Signed-off-by: Maciej Sosnowski --- drivers/dca/dca-core.c | 120 ++++++++++++++++++++++++++++++++++++----- drivers/dma/ioat/pci.c | 2 +- include/linux/dca.h | 11 +++- 3 files changed, 119 insertions(+), 14 deletions(-) diff --git a/drivers/dca/dca-core.c b/drivers/dca/dca-core.c index 25b743abfb59..7e318de0904b 100644 --- a/drivers/dca/dca-core.c +++ b/drivers/dca/dca-core.c @@ -28,7 +28,7 @@ #include #include -#define DCA_VERSION "1.8" +#define DCA_VERSION "1.12.1" MODULE_VERSION(DCA_VERSION); MODULE_LICENSE("GPL"); @@ -36,20 +36,92 @@ MODULE_AUTHOR("Intel Corporation"); static DEFINE_SPINLOCK(dca_lock); -static LIST_HEAD(dca_providers); +static LIST_HEAD(dca_domains); + +static struct pci_bus *dca_pci_rc_from_dev(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct pci_bus *bus = pdev->bus; + + while (bus->parent) + bus = bus->parent; + + return bus; +} + +static struct dca_domain *dca_allocate_domain(struct pci_bus *rc) +{ + struct dca_domain *domain; + + domain = kzalloc(sizeof(*domain), GFP_NOWAIT); + if (!domain) + return NULL; + + INIT_LIST_HEAD(&domain->dca_providers); + domain->pci_rc = rc; + + return domain; +} + +static void dca_free_domain(struct dca_domain *domain) +{ + list_del(&domain->node); + kfree(domain); +} + +static struct dca_domain *dca_find_domain(struct pci_bus *rc) +{ + struct dca_domain *domain; + + list_for_each_entry(domain, &dca_domains, node) + if (domain->pci_rc == rc) + return domain; + + return NULL; +} + +static struct dca_domain *dca_get_domain(struct device *dev) +{ + struct pci_bus *rc; + struct dca_domain *domain; + + rc = dca_pci_rc_from_dev(dev); + domain = dca_find_domain(rc); + + if (!domain) { + domain = dca_allocate_domain(rc); + if (domain) + list_add(&domain->node, &dca_domains); + } + + return domain; +} static struct dca_provider *dca_find_provider_by_dev(struct device *dev) { - struct dca_provider *dca, *ret = NULL; + struct dca_provider *dca; + struct pci_bus *rc; + struct dca_domain *domain; - list_for_each_entry(dca, &dca_providers, node) { - if ((!dev) || (dca->ops->dev_managed(dca, dev))) { - ret = dca; - break; - } + if (dev) { + rc = dca_pci_rc_from_dev(dev); + domain = dca_find_domain(rc); + if (!domain) + return NULL; + } else { + if (!list_empty(&dca_domains)) + domain = list_first_entry(&dca_domains, + struct dca_domain, + node); + else + return NULL; } - return ret; + list_for_each_entry(dca, &domain->dca_providers, node) + if ((!dev) || (dca->ops->dev_managed(dca, dev))) + return dca; + + return NULL; } /** @@ -61,6 +133,8 @@ int dca_add_requester(struct device *dev) struct dca_provider *dca; int err, slot = -ENODEV; unsigned long flags; + struct pci_bus *pci_rc; + struct dca_domain *domain; if (!dev) return -EFAULT; @@ -74,7 +148,14 @@ int dca_add_requester(struct device *dev) return -EEXIST; } - list_for_each_entry(dca, &dca_providers, node) { + pci_rc = dca_pci_rc_from_dev(dev); + domain = dca_find_domain(pci_rc); + if (!domain) { + spin_unlock_irqrestore(&dca_lock, flags); + return -ENODEV; + } + + list_for_each_entry(dca, &domain->dca_providers, node) { slot = dca->ops->add_requester(dca, dev); if (slot >= 0) break; @@ -222,13 +303,19 @@ int register_dca_provider(struct dca_provider *dca, struct device *dev) { int err; unsigned long flags; + struct dca_domain *domain; err = dca_sysfs_add_provider(dca, dev); if (err) return err; spin_lock_irqsave(&dca_lock, flags); - list_add(&dca->node, &dca_providers); + domain = dca_get_domain(dev); + if (!domain) { + spin_unlock_irqrestore(&dca_lock, flags); + return -ENODEV; + } + list_add(&dca->node, &domain->dca_providers); spin_unlock_irqrestore(&dca_lock, flags); blocking_notifier_call_chain(&dca_provider_chain, @@ -241,15 +328,24 @@ EXPORT_SYMBOL_GPL(register_dca_provider); * unregister_dca_provider - remove a dca provider * @dca - struct created by alloc_dca_provider() */ -void unregister_dca_provider(struct dca_provider *dca) +void unregister_dca_provider(struct dca_provider *dca, struct device *dev) { unsigned long flags; + struct pci_bus *pci_rc; + struct dca_domain *domain; blocking_notifier_call_chain(&dca_provider_chain, DCA_PROVIDER_REMOVE, NULL); spin_lock_irqsave(&dca_lock, flags); + list_del(&dca->node); + + pci_rc = dca_pci_rc_from_dev(dev); + domain = dca_find_domain(pci_rc); + if (list_empty(&domain->dca_providers)) + dca_free_domain(domain); + spin_unlock_irqrestore(&dca_lock, flags); dca_sysfs_remove_provider(dca); diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index c788fa266470..d545fae30f37 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -175,7 +175,7 @@ static void __devexit ioat_remove(struct pci_dev *pdev) dev_err(&pdev->dev, "Removing dma and dca services\n"); if (device->dca) { - unregister_dca_provider(device->dca); + unregister_dca_provider(device->dca, &pdev->dev); free_dca_provider(device->dca); device->dca = NULL; } diff --git a/include/linux/dca.h b/include/linux/dca.h index 9c20c7e87d0a..d27a7a05718d 100644 --- a/include/linux/dca.h +++ b/include/linux/dca.h @@ -20,6 +20,9 @@ */ #ifndef DCA_H #define DCA_H + +#include + /* DCA Provider API */ /* DCA Notifier Interface */ @@ -36,6 +39,12 @@ struct dca_provider { int id; }; +struct dca_domain { + struct list_head node; + struct list_head dca_providers; + struct pci_bus *pci_rc; +}; + struct dca_ops { int (*add_requester) (struct dca_provider *, struct device *); int (*remove_requester) (struct dca_provider *, struct device *); @@ -47,7 +56,7 @@ struct dca_ops { struct dca_provider *alloc_dca_provider(struct dca_ops *ops, int priv_size); void free_dca_provider(struct dca_provider *dca); int register_dca_provider(struct dca_provider *dca, struct device *dev); -void unregister_dca_provider(struct dca_provider *dca); +void unregister_dca_provider(struct dca_provider *dca, struct device *dev); static inline void *dca_priv(struct dca_provider *dca) {