9ffaeee7bc
commit 04e046ca57ebed3943422dee10eec9e73aec081e upstream. pci-epc-mem uses a bitmap to manage the Endpoint outbound (OB) address region. This address region will be shared by multiple endpoint functions (in the case of multi function endpoint) and it has to be protected from concurrent access to avoid updating an inconsistent state. Use a mutex to protect bitmap updates to prevent the memory allocation API from returning incorrect addresses. Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
175 lines
6.2 KiB
C
175 lines
6.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/**
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* PCI Endpoint *Controller* (EPC) header file
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*
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* Copyright (C) 2017 Texas Instruments
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* Author: Kishon Vijay Abraham I <kishon@ti.com>
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*/
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#ifndef __LINUX_PCI_EPC_H
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#define __LINUX_PCI_EPC_H
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#include <linux/pci-epf.h>
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struct pci_epc;
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enum pci_epc_irq_type {
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PCI_EPC_IRQ_UNKNOWN,
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PCI_EPC_IRQ_LEGACY,
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PCI_EPC_IRQ_MSI,
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PCI_EPC_IRQ_MSIX,
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};
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/**
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* struct pci_epc_ops - set of function pointers for performing EPC operations
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* @write_header: ops to populate configuration space header
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* @set_bar: ops to configure the BAR
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* @clear_bar: ops to reset the BAR
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* @map_addr: ops to map CPU address to PCI address
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* @unmap_addr: ops to unmap CPU address and PCI address
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* @set_msi: ops to set the requested number of MSI interrupts in the MSI
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* capability register
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* @get_msi: ops to get the number of MSI interrupts allocated by the RC from
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* the MSI capability register
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* @set_msix: ops to set the requested number of MSI-X interrupts in the
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* MSI-X capability register
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* @get_msix: ops to get the number of MSI-X interrupts allocated by the RC
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* from the MSI-X capability register
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* @raise_irq: ops to raise a legacy, MSI or MSI-X interrupt
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* @start: ops to start the PCI link
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* @stop: ops to stop the PCI link
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* @owner: the module owner containing the ops
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*/
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struct pci_epc_ops {
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int (*write_header)(struct pci_epc *epc, u8 func_no,
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struct pci_epf_header *hdr);
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int (*set_bar)(struct pci_epc *epc, u8 func_no,
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struct pci_epf_bar *epf_bar);
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void (*clear_bar)(struct pci_epc *epc, u8 func_no,
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struct pci_epf_bar *epf_bar);
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int (*map_addr)(struct pci_epc *epc, u8 func_no,
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phys_addr_t addr, u64 pci_addr, size_t size);
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void (*unmap_addr)(struct pci_epc *epc, u8 func_no,
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phys_addr_t addr);
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int (*set_msi)(struct pci_epc *epc, u8 func_no, u8 interrupts);
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int (*get_msi)(struct pci_epc *epc, u8 func_no);
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int (*set_msix)(struct pci_epc *epc, u8 func_no, u16 interrupts);
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int (*get_msix)(struct pci_epc *epc, u8 func_no);
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int (*raise_irq)(struct pci_epc *epc, u8 func_no,
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enum pci_epc_irq_type type, u16 interrupt_num);
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int (*start)(struct pci_epc *epc);
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void (*stop)(struct pci_epc *epc);
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struct module *owner;
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};
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/**
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* struct pci_epc_mem - address space of the endpoint controller
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* @phys_base: physical base address of the PCI address space
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* @size: the size of the PCI address space
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* @bitmap: bitmap to manage the PCI address space
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* @pages: number of bits representing the address region
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* @page_size: size of each page
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* @lock: mutex to protect bitmap
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*/
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struct pci_epc_mem {
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phys_addr_t phys_base;
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size_t size;
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unsigned long *bitmap;
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size_t page_size;
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int pages;
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/* mutex to protect against concurrent access for memory allocation*/
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struct mutex lock;
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};
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/**
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* struct pci_epc - represents the PCI EPC device
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* @dev: PCI EPC device
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* @pci_epf: list of endpoint functions present in this EPC device
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* @ops: function pointers for performing endpoint operations
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* @mem: address space of the endpoint controller
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* @max_functions: max number of functions that can be configured in this EPC
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* @group: configfs group representing the PCI EPC device
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* @lock: spinlock to protect pci_epc ops
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*/
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struct pci_epc {
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struct device dev;
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struct list_head pci_epf;
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const struct pci_epc_ops *ops;
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struct pci_epc_mem *mem;
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u8 max_functions;
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struct config_group *group;
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/* spinlock to protect against concurrent access of EP controller */
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spinlock_t lock;
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unsigned int features;
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};
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#define EPC_FEATURE_NO_LINKUP_NOTIFIER BIT(0)
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#define EPC_FEATURE_BAR_MASK (BIT(1) | BIT(2) | BIT(3))
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#define EPC_FEATURE_MSIX_AVAILABLE BIT(4)
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#define EPC_FEATURE_SET_BAR(features, bar) \
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(features |= (EPC_FEATURE_BAR_MASK & (bar << 1)))
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#define EPC_FEATURE_GET_BAR(features) \
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((features & EPC_FEATURE_BAR_MASK) >> 1)
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#define to_pci_epc(device) container_of((device), struct pci_epc, dev)
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#define pci_epc_create(dev, ops) \
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__pci_epc_create((dev), (ops), THIS_MODULE)
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#define devm_pci_epc_create(dev, ops) \
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__devm_pci_epc_create((dev), (ops), THIS_MODULE)
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#define pci_epc_mem_init(epc, phys_addr, size) \
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__pci_epc_mem_init((epc), (phys_addr), (size), PAGE_SIZE)
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static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
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{
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dev_set_drvdata(&epc->dev, data);
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}
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static inline void *epc_get_drvdata(struct pci_epc *epc)
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{
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return dev_get_drvdata(&epc->dev);
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}
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struct pci_epc *
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__devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
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struct module *owner);
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struct pci_epc *
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__pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
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struct module *owner);
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void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
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void pci_epc_destroy(struct pci_epc *epc);
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int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf);
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void pci_epc_linkup(struct pci_epc *epc);
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void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf);
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int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
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struct pci_epf_header *hdr);
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int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
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struct pci_epf_bar *epf_bar);
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void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
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struct pci_epf_bar *epf_bar);
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int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
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phys_addr_t phys_addr,
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u64 pci_addr, size_t size);
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void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
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phys_addr_t phys_addr);
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int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts);
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int pci_epc_get_msi(struct pci_epc *epc, u8 func_no);
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int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts);
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int pci_epc_get_msix(struct pci_epc *epc, u8 func_no);
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int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
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enum pci_epc_irq_type type, u16 interrupt_num);
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int pci_epc_start(struct pci_epc *epc);
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void pci_epc_stop(struct pci_epc *epc);
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struct pci_epc *pci_epc_get(const char *epc_name);
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void pci_epc_put(struct pci_epc *epc);
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int __pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size,
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size_t page_size);
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void pci_epc_mem_exit(struct pci_epc *epc);
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void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
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phys_addr_t *phys_addr, size_t size);
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void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
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void __iomem *virt_addr, size_t size);
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#endif /* __LINUX_PCI_EPC_H */
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