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198 lines
4.8 KiB
198 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2013-2015 ARM Limited, All Rights Reserved. |
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* Author: Marc Zyngier <[email protected]> |
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*/ |
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#include <linux/acpi_iort.h> |
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#include <linux/pci.h> |
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#include <linux/msi.h> |
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#include <linux/of.h> |
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#include <linux/of_irq.h> |
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#include <linux/of_pci.h> |
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static void its_mask_msi_irq(struct irq_data *d) |
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{ |
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pci_msi_mask_irq(d); |
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irq_chip_mask_parent(d); |
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} |
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static void its_unmask_msi_irq(struct irq_data *d) |
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{ |
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pci_msi_unmask_irq(d); |
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irq_chip_unmask_parent(d); |
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} |
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static struct irq_chip its_msi_irq_chip = { |
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.name = "ITS-MSI", |
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.irq_unmask = its_unmask_msi_irq, |
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.irq_mask = its_mask_msi_irq, |
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.irq_eoi = irq_chip_eoi_parent, |
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.irq_write_msi_msg = pci_msi_domain_write_msg, |
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}; |
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static int its_pci_msi_vec_count(struct pci_dev *pdev, void *data) |
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{ |
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int msi, msix, *count = data; |
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msi = max(pci_msi_vec_count(pdev), 0); |
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msix = max(pci_msix_vec_count(pdev), 0); |
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*count += max(msi, msix); |
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return 0; |
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} |
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static int its_get_pci_alias(struct pci_dev *pdev, u16 alias, void *data) |
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{ |
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struct pci_dev **alias_dev = data; |
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*alias_dev = pdev; |
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return 0; |
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} |
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static int its_pci_msi_prepare(struct irq_domain *domain, struct device *dev, |
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int nvec, msi_alloc_info_t *info) |
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{ |
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struct pci_dev *pdev, *alias_dev; |
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struct msi_domain_info *msi_info; |
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int alias_count = 0, minnvec = 1; |
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if (!dev_is_pci(dev)) |
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return -EINVAL; |
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msi_info = msi_get_domain_info(domain->parent); |
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pdev = to_pci_dev(dev); |
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/* |
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* If pdev is downstream of any aliasing bridges, take an upper |
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* bound of how many other vectors could map to the same DevID. |
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*/ |
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pci_for_each_dma_alias(pdev, its_get_pci_alias, &alias_dev); |
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if (alias_dev != pdev && alias_dev->subordinate) |
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pci_walk_bus(alias_dev->subordinate, its_pci_msi_vec_count, |
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&alias_count); |
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/* ITS specific DeviceID, as the core ITS ignores dev. */ |
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info->scratchpad[0].ul = pci_msi_domain_get_msi_rid(domain, pdev); |
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/* |
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* Always allocate a power of 2, and special case device 0 for |
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* broken systems where the DevID is not wired (and all devices |
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* appear as DevID 0). For that reason, we generously allocate a |
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* minimum of 32 MSIs for DevID 0. If you want more because all |
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* your devices are aliasing to DevID 0, consider fixing your HW. |
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*/ |
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nvec = max(nvec, alias_count); |
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if (!info->scratchpad[0].ul) |
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minnvec = 32; |
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nvec = max_t(int, minnvec, roundup_pow_of_two(nvec)); |
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return msi_info->ops->msi_prepare(domain->parent, dev, nvec, info); |
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} |
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static struct msi_domain_ops its_pci_msi_ops = { |
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.msi_prepare = its_pci_msi_prepare, |
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}; |
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static struct msi_domain_info its_pci_msi_domain_info = { |
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.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | |
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MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX), |
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.ops = &its_pci_msi_ops, |
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.chip = &its_msi_irq_chip, |
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}; |
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static struct of_device_id its_device_id[] = { |
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{ .compatible = "arm,gic-v3-its", }, |
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{}, |
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}; |
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static int __init its_pci_msi_init_one(struct fwnode_handle *handle, |
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const char *name) |
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{ |
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struct irq_domain *parent; |
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parent = irq_find_matching_fwnode(handle, DOMAIN_BUS_NEXUS); |
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if (!parent || !msi_get_domain_info(parent)) { |
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pr_err("%s: Unable to locate ITS domain\n", name); |
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return -ENXIO; |
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} |
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if (!pci_msi_create_irq_domain(handle, &its_pci_msi_domain_info, |
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parent)) { |
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pr_err("%s: Unable to create PCI domain\n", name); |
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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 __init its_pci_of_msi_init(void) |
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{ |
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struct device_node *np; |
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for (np = of_find_matching_node(NULL, its_device_id); np; |
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np = of_find_matching_node(np, its_device_id)) { |
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if (!of_device_is_available(np)) |
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continue; |
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if (!of_property_read_bool(np, "msi-controller")) |
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continue; |
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if (its_pci_msi_init_one(of_node_to_fwnode(np), np->full_name)) |
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continue; |
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pr_info("PCI/MSI: %pOF domain created\n", np); |
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} |
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return 0; |
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} |
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#ifdef CONFIG_ACPI |
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static int __init |
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its_pci_msi_parse_madt(union acpi_subtable_headers *header, |
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const unsigned long end) |
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{ |
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struct acpi_madt_generic_translator *its_entry; |
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struct fwnode_handle *dom_handle; |
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const char *node_name; |
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int err = -ENXIO; |
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its_entry = (struct acpi_madt_generic_translator *)header; |
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node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx", |
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(long)its_entry->base_address); |
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dom_handle = iort_find_domain_token(its_entry->translation_id); |
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if (!dom_handle) { |
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pr_err("%s: Unable to locate ITS domain handle\n", node_name); |
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goto out; |
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} |
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err = its_pci_msi_init_one(dom_handle, node_name); |
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if (!err) |
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pr_info("PCI/MSI: %s domain created\n", node_name); |
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out: |
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kfree(node_name); |
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return err; |
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} |
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static int __init its_pci_acpi_msi_init(void) |
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{ |
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acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR, |
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its_pci_msi_parse_madt, 0); |
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return 0; |
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} |
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#else |
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static int __init its_pci_acpi_msi_init(void) |
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{ |
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return 0; |
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} |
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#endif |
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static int __init its_pci_msi_init(void) |
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{ |
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its_pci_of_msi_init(); |
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its_pci_acpi_msi_init(); |
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return 0; |
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} |
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early_initcall(its_pci_msi_init);
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