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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-01 13:46:42 +07:00
99cb233d60
For Broadcom 5706, 5708, 5709 rev. A nics, any read beyond the
VPD end tag will hang the device. This problem was initially
observed when a vpd entry was created in sysfs
('/sys/bus/pci/devices/<id>/vpd'). A read to this sysfs entry
will dump 32k of data. Reading a full 32k will cause an access
beyond the VPD end tag causing the device to hang. Once the device
is hung, the bnx2 driver will not be able to reset the device.
We believe that it is legal to read beyond the end tag and
therefore the solution is to limit the read/write length.
A majority of this patch is from Matthew Wilcox who gave code for
reworking the PCI vpd size information. A PCI quirk added for the
Broadcom NIC's to limit the read/write's.
Signed-off-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
109 lines
3.7 KiB
C
109 lines
3.7 KiB
C
/* Functions internal to the PCI core code */
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extern int pci_uevent(struct device *dev, struct kobj_uevent_env *env);
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extern int pci_create_sysfs_dev_files(struct pci_dev *pdev);
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extern void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
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extern void pci_cleanup_rom(struct pci_dev *dev);
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/* Firmware callbacks */
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extern pci_power_t (*platform_pci_choose_state)(struct pci_dev *dev,
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pm_message_t state);
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extern int (*platform_pci_set_power_state)(struct pci_dev *dev,
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pci_power_t state);
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extern int pci_user_read_config_byte(struct pci_dev *dev, int where, u8 *val);
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extern int pci_user_read_config_word(struct pci_dev *dev, int where, u16 *val);
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extern int pci_user_read_config_dword(struct pci_dev *dev, int where, u32 *val);
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extern int pci_user_write_config_byte(struct pci_dev *dev, int where, u8 val);
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extern int pci_user_write_config_word(struct pci_dev *dev, int where, u16 val);
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extern int pci_user_write_config_dword(struct pci_dev *dev, int where, u32 val);
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struct pci_vpd_ops {
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int (*read)(struct pci_dev *dev, int pos, int size, char *buf);
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int (*write)(struct pci_dev *dev, int pos, int size, const char *buf);
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void (*release)(struct pci_dev *dev);
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};
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struct pci_vpd {
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unsigned int len;
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struct pci_vpd_ops *ops;
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struct bin_attribute *attr; /* descriptor for sysfs VPD entry */
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};
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extern int pci_vpd_pci22_init(struct pci_dev *dev);
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static inline void pci_vpd_release(struct pci_dev *dev)
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{
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if (dev->vpd)
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dev->vpd->ops->release(dev);
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}
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/* PCI /proc functions */
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#ifdef CONFIG_PROC_FS
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extern int pci_proc_attach_device(struct pci_dev *dev);
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extern int pci_proc_detach_device(struct pci_dev *dev);
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extern int pci_proc_detach_bus(struct pci_bus *bus);
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#else
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static inline int pci_proc_attach_device(struct pci_dev *dev) { return 0; }
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static inline int pci_proc_detach_device(struct pci_dev *dev) { return 0; }
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static inline int pci_proc_detach_bus(struct pci_bus *bus) { return 0; }
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#endif
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/* Functions for PCI Hotplug drivers to use */
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extern unsigned int pci_do_scan_bus(struct pci_bus *bus);
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extern void pci_remove_legacy_files(struct pci_bus *bus);
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/* Lock for read/write access to pci device and bus lists */
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extern struct rw_semaphore pci_bus_sem;
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extern unsigned int pci_pm_d3_delay;
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#ifdef CONFIG_PCI_MSI
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void pci_no_msi(void);
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extern void pci_msi_init_pci_dev(struct pci_dev *dev);
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#else
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static inline void pci_no_msi(void) { }
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static inline void pci_msi_init_pci_dev(struct pci_dev *dev) { }
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#endif
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#ifdef CONFIG_PCIEAER
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void pci_no_aer(void);
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#else
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static inline void pci_no_aer(void) { }
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#endif
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static inline int pci_no_d1d2(struct pci_dev *dev)
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{
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unsigned int parent_dstates = 0;
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if (dev->bus->self)
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parent_dstates = dev->bus->self->no_d1d2;
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return (dev->no_d1d2 || parent_dstates);
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}
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extern int pcie_mch_quirk;
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extern struct device_attribute pci_dev_attrs[];
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extern struct device_attribute dev_attr_cpuaffinity;
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/**
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* pci_match_one_device - Tell if a PCI device structure has a matching
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* PCI device id structure
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* @id: single PCI device id structure to match
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* @dev: the PCI device structure to match against
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*
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* Returns the matching pci_device_id structure or %NULL if there is no match.
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*/
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static inline const struct pci_device_id *
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pci_match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
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{
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if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) &&
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(id->device == PCI_ANY_ID || id->device == dev->device) &&
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(id->subvendor == PCI_ANY_ID || id->subvendor == dev->subsystem_vendor) &&
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(id->subdevice == PCI_ANY_ID || id->subdevice == dev->subsystem_device) &&
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!((id->class ^ dev->class) & id->class_mask))
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return id;
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return NULL;
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}
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struct pci_dev *pci_find_upstream_pcie_bridge(struct pci_dev *pdev);
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