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![Marc Zyngier](/assets/img/avatar_default.png)
Now that we have irq_domain_update_bus_token(), switch everyone over to it. The debugfs code thanks you for your continued support. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
416 lines
11 KiB
C
416 lines
11 KiB
C
/*
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* MSI framework for platform devices
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*
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* Copyright (C) 2015 ARM Limited, All Rights Reserved.
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/device.h>
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#include <linux/idr.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/msi.h>
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#include <linux/slab.h>
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#define DEV_ID_SHIFT 21
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#define MAX_DEV_MSIS (1 << (32 - DEV_ID_SHIFT))
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/*
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* Internal data structure containing a (made up, but unique) devid
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* and the callback to write the MSI message.
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*/
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struct platform_msi_priv_data {
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struct device *dev;
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void *host_data;
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msi_alloc_info_t arg;
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irq_write_msi_msg_t write_msg;
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int devid;
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};
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/* The devid allocator */
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static DEFINE_IDA(platform_msi_devid_ida);
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#ifdef GENERIC_MSI_DOMAIN_OPS
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/*
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* Convert an msi_desc to a globaly unique identifier (per-device
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* devid + msi_desc position in the msi_list).
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*/
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static irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
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{
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u32 devid;
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devid = desc->platform.msi_priv_data->devid;
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return (devid << (32 - DEV_ID_SHIFT)) | desc->platform.msi_index;
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}
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static void platform_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
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{
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arg->desc = desc;
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arg->hwirq = platform_msi_calc_hwirq(desc);
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}
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static int platform_msi_init(struct irq_domain *domain,
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struct msi_domain_info *info,
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unsigned int virq, irq_hw_number_t hwirq,
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msi_alloc_info_t *arg)
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{
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return irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
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info->chip, info->chip_data);
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}
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#else
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#define platform_msi_set_desc NULL
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#define platform_msi_init NULL
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#endif
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static void platform_msi_update_dom_ops(struct msi_domain_info *info)
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{
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struct msi_domain_ops *ops = info->ops;
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BUG_ON(!ops);
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if (ops->msi_init == NULL)
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ops->msi_init = platform_msi_init;
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if (ops->set_desc == NULL)
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ops->set_desc = platform_msi_set_desc;
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}
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static void platform_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
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{
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struct msi_desc *desc = irq_data_get_msi_desc(data);
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struct platform_msi_priv_data *priv_data;
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priv_data = desc->platform.msi_priv_data;
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priv_data->write_msg(desc, msg);
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}
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static void platform_msi_update_chip_ops(struct msi_domain_info *info)
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{
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struct irq_chip *chip = info->chip;
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BUG_ON(!chip);
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if (!chip->irq_mask)
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chip->irq_mask = irq_chip_mask_parent;
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if (!chip->irq_unmask)
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chip->irq_unmask = irq_chip_unmask_parent;
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if (!chip->irq_eoi)
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chip->irq_eoi = irq_chip_eoi_parent;
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if (!chip->irq_set_affinity)
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chip->irq_set_affinity = msi_domain_set_affinity;
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if (!chip->irq_write_msi_msg)
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chip->irq_write_msi_msg = platform_msi_write_msg;
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}
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static void platform_msi_free_descs(struct device *dev, int base, int nvec)
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{
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struct msi_desc *desc, *tmp;
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list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
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if (desc->platform.msi_index >= base &&
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desc->platform.msi_index < (base + nvec)) {
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list_del(&desc->list);
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free_msi_entry(desc);
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}
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}
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}
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static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq,
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int nvec,
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struct platform_msi_priv_data *data)
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{
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struct msi_desc *desc;
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int i, base = 0;
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if (!list_empty(dev_to_msi_list(dev))) {
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desc = list_last_entry(dev_to_msi_list(dev),
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struct msi_desc, list);
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base = desc->platform.msi_index + 1;
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}
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for (i = 0; i < nvec; i++) {
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desc = alloc_msi_entry(dev, 1, NULL);
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if (!desc)
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break;
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desc->platform.msi_priv_data = data;
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desc->platform.msi_index = base + i;
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desc->irq = virq ? virq + i : 0;
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list_add_tail(&desc->list, dev_to_msi_list(dev));
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}
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if (i != nvec) {
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/* Clean up the mess */
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platform_msi_free_descs(dev, base, nvec);
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return -ENOMEM;
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}
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return 0;
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}
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static int platform_msi_alloc_descs(struct device *dev, int nvec,
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struct platform_msi_priv_data *data)
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{
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return platform_msi_alloc_descs_with_irq(dev, 0, nvec, data);
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}
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/**
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* platform_msi_create_irq_domain - Create a platform MSI interrupt domain
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* @fwnode: Optional fwnode of the interrupt controller
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* @info: MSI domain info
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* @parent: Parent irq domain
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*
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* Updates the domain and chip ops and creates a platform MSI
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* interrupt domain.
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*
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* Returns:
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* A domain pointer or NULL in case of failure.
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*/
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struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
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struct msi_domain_info *info,
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struct irq_domain *parent)
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{
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struct irq_domain *domain;
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if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
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platform_msi_update_dom_ops(info);
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if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
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platform_msi_update_chip_ops(info);
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domain = msi_create_irq_domain(fwnode, info, parent);
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if (domain)
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irq_domain_update_bus_token(domain, DOMAIN_BUS_PLATFORM_MSI);
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return domain;
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}
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static struct platform_msi_priv_data *
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platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
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irq_write_msi_msg_t write_msi_msg)
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{
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struct platform_msi_priv_data *datap;
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/*
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* Limit the number of interrupts to 2048 per device. Should we
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* need to bump this up, DEV_ID_SHIFT should be adjusted
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* accordingly (which would impact the max number of MSI
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* capable devices).
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*/
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if (!dev->msi_domain || !write_msi_msg || !nvec || nvec > MAX_DEV_MSIS)
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return ERR_PTR(-EINVAL);
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if (dev->msi_domain->bus_token != DOMAIN_BUS_PLATFORM_MSI) {
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dev_err(dev, "Incompatible msi_domain, giving up\n");
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return ERR_PTR(-EINVAL);
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}
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/* Already had a helping of MSI? Greed... */
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if (!list_empty(dev_to_msi_list(dev)))
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return ERR_PTR(-EBUSY);
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datap = kzalloc(sizeof(*datap), GFP_KERNEL);
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if (!datap)
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return ERR_PTR(-ENOMEM);
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datap->devid = ida_simple_get(&platform_msi_devid_ida,
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0, 1 << DEV_ID_SHIFT, GFP_KERNEL);
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if (datap->devid < 0) {
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int err = datap->devid;
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kfree(datap);
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return ERR_PTR(err);
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}
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datap->write_msg = write_msi_msg;
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datap->dev = dev;
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return datap;
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}
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static void platform_msi_free_priv_data(struct platform_msi_priv_data *data)
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{
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ida_simple_remove(&platform_msi_devid_ida, data->devid);
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kfree(data);
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}
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/**
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* platform_msi_domain_alloc_irqs - Allocate MSI interrupts for @dev
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* @dev: The device for which to allocate interrupts
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* @nvec: The number of interrupts to allocate
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* @write_msi_msg: Callback to write an interrupt message for @dev
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*
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* Returns:
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* Zero for success, or an error code in case of failure
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*/
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int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
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irq_write_msi_msg_t write_msi_msg)
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{
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struct platform_msi_priv_data *priv_data;
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int err;
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priv_data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
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if (IS_ERR(priv_data))
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return PTR_ERR(priv_data);
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err = platform_msi_alloc_descs(dev, nvec, priv_data);
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if (err)
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goto out_free_priv_data;
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err = msi_domain_alloc_irqs(dev->msi_domain, dev, nvec);
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if (err)
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goto out_free_desc;
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return 0;
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out_free_desc:
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platform_msi_free_descs(dev, 0, nvec);
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out_free_priv_data:
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platform_msi_free_priv_data(priv_data);
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return err;
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}
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EXPORT_SYMBOL_GPL(platform_msi_domain_alloc_irqs);
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/**
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* platform_msi_domain_free_irqs - Free MSI interrupts for @dev
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* @dev: The device for which to free interrupts
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*/
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void platform_msi_domain_free_irqs(struct device *dev)
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{
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if (!list_empty(dev_to_msi_list(dev))) {
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struct msi_desc *desc;
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desc = first_msi_entry(dev);
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platform_msi_free_priv_data(desc->platform.msi_priv_data);
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}
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msi_domain_free_irqs(dev->msi_domain, dev);
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platform_msi_free_descs(dev, 0, MAX_DEV_MSIS);
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}
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EXPORT_SYMBOL_GPL(platform_msi_domain_free_irqs);
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/**
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* platform_msi_get_host_data - Query the private data associated with
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* a platform-msi domain
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* @domain: The platform-msi domain
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*
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* Returns the private data provided when calling
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* platform_msi_create_device_domain.
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*/
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void *platform_msi_get_host_data(struct irq_domain *domain)
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{
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struct platform_msi_priv_data *data = domain->host_data;
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return data->host_data;
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}
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/**
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* platform_msi_create_device_domain - Create a platform-msi domain
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*
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* @dev: The device generating the MSIs
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* @nvec: The number of MSIs that need to be allocated
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* @write_msi_msg: Callback to write an interrupt message for @dev
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* @ops: The hierarchy domain operations to use
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* @host_data: Private data associated to this domain
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*
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* Returns an irqdomain for @nvec interrupts
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*/
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struct irq_domain *
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platform_msi_create_device_domain(struct device *dev,
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unsigned int nvec,
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irq_write_msi_msg_t write_msi_msg,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct platform_msi_priv_data *data;
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struct irq_domain *domain;
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int err;
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data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
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if (IS_ERR(data))
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return NULL;
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data->host_data = host_data;
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domain = irq_domain_create_hierarchy(dev->msi_domain, 0, nvec,
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dev->fwnode, ops, data);
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if (!domain)
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goto free_priv;
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err = msi_domain_prepare_irqs(domain->parent, dev, nvec, &data->arg);
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if (err)
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goto free_domain;
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return domain;
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free_domain:
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irq_domain_remove(domain);
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free_priv:
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platform_msi_free_priv_data(data);
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return NULL;
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}
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/**
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* platform_msi_domain_free - Free interrupts associated with a platform-msi
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* domain
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*
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* @domain: The platform-msi domain
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* @virq: The base irq from which to perform the free operation
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* @nvec: How many interrupts to free from @virq
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*/
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void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
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unsigned int nvec)
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{
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struct platform_msi_priv_data *data = domain->host_data;
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struct msi_desc *desc;
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for_each_msi_entry(desc, data->dev) {
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if (WARN_ON(!desc->irq || desc->nvec_used != 1))
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return;
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if (!(desc->irq >= virq && desc->irq < (virq + nvec)))
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continue;
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irq_domain_free_irqs_common(domain, desc->irq, 1);
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}
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}
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/**
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* platform_msi_domain_alloc - Allocate interrupts associated with
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* a platform-msi domain
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*
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* @domain: The platform-msi domain
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* @virq: The base irq from which to perform the allocate operation
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* @nvec: How many interrupts to free from @virq
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*
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* Return 0 on success, or an error code on failure. Must be called
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* with irq_domain_mutex held (which can only be done as part of a
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* top-level interrupt allocation).
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*/
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int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs)
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{
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struct platform_msi_priv_data *data = domain->host_data;
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int err;
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err = platform_msi_alloc_descs_with_irq(data->dev, virq, nr_irqs, data);
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if (err)
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return err;
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err = msi_domain_populate_irqs(domain->parent, data->dev,
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virq, nr_irqs, &data->arg);
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if (err)
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platform_msi_domain_free(domain, virq, nr_irqs);
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return err;
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}
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