From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Auger Subject: [PATCH v11 05/10] genirq/msi-doorbell: msi_doorbell_pages Date: Tue, 19 Jul 2016 13:02:42 +0000 Message-ID: <1468933367-23159-6-git-send-email-eric.auger@redhat.com> References: <1468933367-23159-1-git-send-email-eric.auger@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1468933367-23159-1-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, eric.auger.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, marc.zyngier-5wv7dgnIgG8@public.gmane.org, christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, andre.przywara-5wv7dgnIgG8@public.gmane.org, robin.murphy-5wv7dgnIgG8@public.gmane.org, alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Cc: drjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Manish.Jaggi-M3mlKVOIwJVv6pq1l3V1OdBPR1lH4CV8@public.gmane.org, p.fedin-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, pranav.sawargaonkar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, kvmarm-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg@public.gmane.org, robert.richter-M3mlKVOIwJVv6pq1l3V1OdBPR1lH4CV8@public.gmane.org, yehuday-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org List-Id: iommu@lists.linux-foundation.org msi_doorbell_pages sum up the number of iommu pages of a given order requested to map all the registered doorbells. This function will allow to dimension the intermediate physical address (IPA) aperture requested to map the MSI doorbells. Signed-off-by: Eric Auger --- v10: creation --- include/linux/msi-doorbell.h | 14 ++++++++++++ kernel/irq/msi-doorbell.c | 52 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 66 insertions(+) diff --git a/include/linux/msi-doorbell.h b/include/linux/msi-doorbell.h index c455e33..146bfbc 100644 --- a/include/linux/msi-doorbell.h +++ b/include/linux/msi-doorbell.h @@ -35,6 +35,14 @@ msi_doorbell_register_global(phys_addr_t base, size_t size, */ void msi_doorbell_unregister_global(struct irq_chip_msi_doorbell_info *db); +/** + * msi_doorbell_pages: compute the number of iommu pages of size 1 << order + * requested to map all the registered doorbells + * + * @order: iommu page order + */ +int msi_doorbell_pages(unsigned int order); + #else static inline struct irq_chip_msi_doorbell_info * @@ -47,6 +55,12 @@ msi_doorbell_register_global(phys_addr_t base, size_t size, static inline void msi_doorbell_unregister_global(struct irq_chip_msi_doorbell_info *db) {} +static inline int +msi_doorbell_pages(unsigned int order) +{ + return 0; +} + #endif /* CONFIG_MSI_DOORBELL */ #endif diff --git a/kernel/irq/msi-doorbell.c b/kernel/irq/msi-doorbell.c index 0ff541e..a5bde37 100644 --- a/kernel/irq/msi-doorbell.c +++ b/kernel/irq/msi-doorbell.c @@ -60,3 +60,55 @@ void msi_doorbell_unregister_global(struct irq_chip_msi_doorbell_info *dbinfo) mutex_unlock(&irqchip_doorbell_mutex); } EXPORT_SYMBOL_GPL(msi_doorbell_unregister_global); + +static int compute_db_mapping_requirements(phys_addr_t addr, size_t size, + unsigned int order) +{ + phys_addr_t offset, granule; + unsigned int nb_pages; + + granule = (uint64_t)(1 << order); + offset = addr & (granule - 1); + size = ALIGN(size + offset, granule); + nb_pages = size >> order; + + return nb_pages; +} + +static int +compute_dbinfo_mapping_requirements(struct irq_chip_msi_doorbell_info *dbinfo, + unsigned int order) +{ + int ret = 0; + + if (!dbinfo->doorbell_is_percpu) { + ret = compute_db_mapping_requirements(dbinfo->global_doorbell, + dbinfo->size, order); + } else { + phys_addr_t __percpu *pbase; + int cpu; + + for_each_possible_cpu(cpu) { + pbase = per_cpu_ptr(dbinfo->percpu_doorbells, cpu); + ret += compute_db_mapping_requirements(*pbase, + dbinfo->size, + order); + } + } + return ret; +} + +int msi_doorbell_pages(unsigned int order) +{ + struct irqchip_doorbell *db; + int ret = 0; + + mutex_lock(&irqchip_doorbell_mutex); + list_for_each_entry(db, &irqchip_doorbell_list, next) { + ret += compute_dbinfo_mapping_requirements(&db->info, order); + } + mutex_unlock(&irqchip_doorbell_mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(msi_doorbell_pages); -- 1.9.1