PCI/MSI: Enhance core to support hierarchy irqdomain
Enhance PCI MSI core to support hierarchy irqdomain, so the common code can be shared across architectures. [ tglx: Extracted and combined from several patches ] Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Yingjoe Chen <yingjoe.chen@mediatek.com> Cc: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jiang Liu
Thomas Gleixner
parent
38b6a1cf3e
commit
3878eaefb8
@ -17,6 +17,11 @@ config PCI_MSI
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If you don't know what to do here, say Y.
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config PCI_MSI_IRQ_DOMAIN
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bool
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depends on PCI_MSI
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select GENERIC_MSI_IRQ_DOMAIN
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config PCI_DEBUG
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bool "PCI Debugging"
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depends on PCI && DEBUG_KERNEL
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@ -19,6 +19,7 @@
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/irqdomain.h>
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#include "pci.h"
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@ -1091,3 +1092,170 @@ int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
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return nvec;
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}
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EXPORT_SYMBOL(pci_enable_msix_range);
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#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
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/**
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* pci_msi_domain_write_msg - Helper to write MSI message to PCI config space
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* @irq_data: Pointer to interrupt data of the MSI interrupt
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* @msg: Pointer to the message
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*/
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void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg)
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{
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struct msi_desc *desc = irq_data->msi_desc;
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/*
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* For MSI-X desc->irq is always equal to irq_data->irq. For
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* MSI only the first interrupt of MULTI MSI passes the test.
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*/
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if (desc->irq == irq_data->irq)
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__pci_write_msi_msg(desc, msg);
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}
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/**
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* pci_msi_domain_calc_hwirq - Generate a unique ID for an MSI source
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* @dev: Pointer to the PCI device
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* @desc: Pointer to the msi descriptor
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*
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* The ID number is only used within the irqdomain.
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*/
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irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
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struct msi_desc *desc)
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{
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return (irq_hw_number_t)desc->msi_attrib.entry_nr |
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PCI_DEVID(dev->bus->number, dev->devfn) << 11 |
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(pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
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}
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static inline bool pci_msi_desc_is_multi_msi(struct msi_desc *desc)
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{
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return !desc->msi_attrib.is_msix && desc->nvec_used > 1;
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}
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/**
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* pci_msi_domain_check_cap - Verify that @domain supports the capabilities for @dev
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* @domain: The interrupt domain to check
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* @info: The domain info for verification
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* @dev: The device to check
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*
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* Returns:
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* 0 if the functionality is supported
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* 1 if Multi MSI is requested, but the domain does not support it
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* -ENOTSUPP otherwise
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*/
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int pci_msi_domain_check_cap(struct irq_domain *domain,
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struct msi_domain_info *info, struct device *dev)
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{
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struct msi_desc *desc = first_pci_msi_entry(to_pci_dev(dev));
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/* Special handling to support pci_enable_msi_range() */
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if (pci_msi_desc_is_multi_msi(desc) &&
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!(info->flags & MSI_FLAG_MULTI_PCI_MSI))
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return 1;
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else if (desc->msi_attrib.is_msix && !(info->flags & MSI_FLAG_PCI_MSIX))
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return -ENOTSUPP;
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return 0;
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}
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static int pci_msi_domain_handle_error(struct irq_domain *domain,
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struct msi_desc *desc, int error)
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{
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/* Special handling to support pci_enable_msi_range() */
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if (pci_msi_desc_is_multi_msi(desc) && error == -ENOSPC)
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return 1;
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return error;
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}
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#ifdef GENERIC_MSI_DOMAIN_OPS
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static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
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struct msi_desc *desc)
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{
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arg->desc = desc;
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arg->hwirq = pci_msi_domain_calc_hwirq(msi_desc_to_pci_dev(desc),
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desc);
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}
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#else
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#define pci_msi_domain_set_desc NULL
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#endif
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static struct msi_domain_ops pci_msi_domain_ops_default = {
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.set_desc = pci_msi_domain_set_desc,
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.msi_check = pci_msi_domain_check_cap,
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.handle_error = pci_msi_domain_handle_error,
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};
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static void pci_msi_domain_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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if (ops == NULL) {
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info->ops = &pci_msi_domain_ops_default;
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} else {
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if (ops->set_desc == NULL)
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ops->set_desc = pci_msi_domain_set_desc;
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if (ops->msi_check == NULL)
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ops->msi_check = pci_msi_domain_check_cap;
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if (ops->handle_error == NULL)
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ops->handle_error = pci_msi_domain_handle_error;
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}
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}
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static void pci_msi_domain_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_write_msi_msg)
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chip->irq_write_msi_msg = pci_msi_domain_write_msg;
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}
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/**
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* pci_msi_create_irq_domain - Creat a MSI interrupt domain
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* @node: Optional device-tree node 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 MSI 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 *pci_msi_create_irq_domain(struct device_node *node,
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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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if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
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pci_msi_domain_update_dom_ops(info);
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if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
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pci_msi_domain_update_chip_ops(info);
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return msi_create_irq_domain(node, info, parent);
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}
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/**
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* pci_msi_domain_alloc_irqs - Allocate interrupts for @dev in @domain
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* @domain: The interrupt domain to allocate from
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* @dev: The device for which to allocate
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* @nvec: The number of interrupts to allocate
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* @type: Unused to allow simpler migration from the arch_XXX interfaces
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*
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* Returns:
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* A virtual interrupt number or an error code in case of failure
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*/
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int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
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int nvec, int type)
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{
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return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
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}
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/**
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* pci_msi_domain_free_irqs - Free interrupts for @dev in @domain
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* @domain: The interrupt domain
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* @dev: The device for which to free interrupts
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*/
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void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev)
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{
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msi_domain_free_irqs(domain, &dev->dev);
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}
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#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
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@ -220,4 +220,18 @@ struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
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#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
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#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
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void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
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struct irq_domain *pci_msi_create_irq_domain(struct device_node *node,
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struct msi_domain_info *info,
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struct irq_domain *parent);
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int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
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int nvec, int type);
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void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev);
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irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
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struct msi_desc *desc);
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int pci_msi_domain_check_cap(struct irq_domain *domain,
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struct msi_domain_info *info, struct device *dev);
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#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
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#endif /* LINUX_MSI_H */
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