From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754285AbbKCLQZ (ORCPT ); Tue, 3 Nov 2015 06:16:25 -0500 Received: from mailapp01.imgtec.com ([195.59.15.196]:46169 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753549AbbKCLNi (ORCPT ); Tue, 3 Nov 2015 06:13:38 -0500 From: Qais Yousef To: CC: , , , , , , Qais Yousef Subject: [PATCH 06/14] genirq: Add struct ipi_mapping and its helper functions Date: Tue, 3 Nov 2015 11:12:53 +0000 Message-ID: <1446549181-31788-7-git-send-email-qais.yousef@imgtec.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1446549181-31788-1-git-send-email-qais.yousef@imgtec.com> References: <1446549181-31788-1-git-send-email-qais.yousef@imgtec.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [192.168.154.94] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org struct ipi_mapping will provide a mechanism for irqchip code to fill out the mapping at reservation and to look it up when sending. Signed-off-by: Qais Yousef --- include/linux/irq.h | 21 +++++++++++++ kernel/irq/manage.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 107 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index 2d3ff30c0cee..ccd53143cc1e 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -1008,4 +1008,25 @@ static inline void ipi_mask_set_cpumask(struct ipi_mask *ipimask, cpumask_copy(&ipimask->cpumask, cpumask); } +#define INVALID_HWIRQ -1 + +/** + * struct ipi_mapping - IPI mapping information object + * @nr_hwirqs: number of hwirqs mapped + * @nr_cpus: number of cpus the controller can talk to + * @cpumap: per cpu hwirq mapping table + */ +struct ipi_mapping { + unsigned int nr_hwirqs; + unsigned int nr_cpus; + unsigned int cpumap[]; +}; + +struct ipi_mapping *irq_alloc_ipi_mapping(unsigned int nr_cpus); +void irq_free_ipi_mapping(struct ipi_mapping *map); +int irq_map_ipi(struct ipi_mapping *map, + unsigned int cpu, irq_hw_number_t hwirq); +int irq_unmap_ipi(struct ipi_mapping *map, + unsigned int cpu, irq_hw_number_t *hwirq); + #endif /* _LINUX_IRQ_H */ diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index a71175ff98d5..67a71667a359 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -2001,3 +2001,89 @@ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, return err; } EXPORT_SYMBOL_GPL(irq_set_irqchip_state); + +/** + * irq_alloc_ipi_mapping - allocate memory for struct ipi_mapping + * @nr_cpus: number of CPUs the mapping will have + * + * Will allocate and setup ipi_mapping structure. + * + * Returns a valid ipi_mapping pointer on success and NULL on error. + */ +struct ipi_mapping *irq_alloc_ipi_mapping(unsigned int nr_cpus) +{ + struct ipi_mapping *map; + int i; + + map = kzalloc(sizeof(struct ipi_mapping) + + BITS_TO_LONGS(nr_cpus), GFP_KERNEL); + if (!map) + return NULL; + + map->nr_cpus = nr_cpus; + + memset(map->cpumap, INVALID_HWIRQ, nr_cpus); + + return map; +} + +/** + * irq_free_ipi_mapping - release mempry associated with ipi_mapping struct + * @map: pointer to struct ipi_mapping to be freed + * + * Release the memory allocated for sturct ipi_mapping to the system. + */ +void irq_free_ipi_mapping(struct ipi_mapping *map) +{ + kfree(map); +} + +/** + * irq_map_ipi - create a CPU to HWIRQ mapping for an IPI + * @map: pointer to the mapping structure + * @cpu: the CPU to map + * @hwirq: the HWIRQ to associate with @cpu + * + * Returns zero on success and negative error number on failure. + */ +int irq_map_ipi(struct ipi_mapping *map, + unsigned int cpu, irq_hw_number_t hwirq) +{ + if (cpu >= map->nr_cpus) + return -EINVAL; + + map->cpumap[cpu] = hwirq; + map->nr_hwirqs++; + + return 0; +} + +/** + * irq_unmap_ipi - remove the CPU mapping of an IPI + * @map: pointer to the mapping structure + * @cpu: the CPU to be unmapped + * @hwirq: pointer to HWIRQ to be filled with old value before unampping + * + * Mark the IPI mapping of a CPU to INVALID_HWIRQ setting @hwirq to the + * old value before unamapping. This old value might be required by the + * caller to return it to the pool of IPIs in a dynamic system. + * + * Returns zero on success and negative error number on failure. + */ +int irq_unmap_ipi(struct ipi_mapping *map, + unsigned int cpu, irq_hw_number_t *hwirq) +{ + if (cpu >= map->nr_cpus) + return -EINVAL; + + if (map->cpumap[cpu] == INVALID_HWIRQ) + return -EINVAL; + + if (hwirq) + *hwirq = map->cpumap[cpu]; + + map->cpumap[cpu] = INVALID_HWIRQ; + map->nr_hwirqs--; + + return 0; +} -- 2.1.0