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PCI: Add pci_get_base_class() helper
There is no function to get all PCI devices in a system by matching against the base class code only, ignoring the sub-class code and the programming interface. Add pci_get_base_class() to suit the need. For example, if a driver wants to process all PCI display devices in a system, it can do so like this: pdev = NULL; while ((pdev = pci_get_base_class(PCI_BASE_CLASS_DISPLAY, pdev))) { do_something_for_pci_display_device(pdev); } Link: https://lore.kernel.org/r/20230825062714.6325-2-sui.jingfeng@linux.dev Signed-off-by: Sui Jingfeng <suijingfeng@loongson.cn> [bhelgaas: reword commit log] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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@ -363,6 +363,37 @@ struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from)
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}
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EXPORT_SYMBOL(pci_get_class);
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/**
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* pci_get_base_class - searching for a PCI device by matching against the base class code only
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* @class: search for a PCI device with this base class code
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* @from: Previous PCI device found in search, or %NULL for new search.
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*
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* Iterates through the list of known PCI devices. If a PCI device is found
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* with a matching base class code, the reference count to the device is
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* incremented. See pci_match_one_device() to figure out how does this works.
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* A new search is initiated by passing %NULL as the @from argument.
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* Otherwise if @from is not %NULL, searches continue from next device on the
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* global list. The reference count for @from is always decremented if it is
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* not %NULL.
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*
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* Returns:
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* A pointer to a matched PCI device, %NULL Otherwise.
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*/
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struct pci_dev *pci_get_base_class(unsigned int class, struct pci_dev *from)
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{
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struct pci_device_id id = {
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.vendor = PCI_ANY_ID,
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.device = PCI_ANY_ID,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.class_mask = 0xFF0000,
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.class = class << 16,
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};
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return pci_get_dev_by_id(&id, from);
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}
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EXPORT_SYMBOL(pci_get_base_class);
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/**
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* pci_dev_present - Returns 1 if device matching the device list is present, 0 if not.
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* @ids: A pointer to a null terminated list of struct pci_device_id structures
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@ -1181,6 +1181,8 @@ struct pci_dev *pci_get_slot(struct pci_bus *bus, unsigned int devfn);
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struct pci_dev *pci_get_domain_bus_and_slot(int domain, unsigned int bus,
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unsigned int devfn);
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struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from);
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struct pci_dev *pci_get_base_class(unsigned int class, struct pci_dev *from);
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int pci_dev_present(const struct pci_device_id *ids);
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int pci_bus_read_config_byte(struct pci_bus *bus, unsigned int devfn,
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@ -1924,6 +1926,9 @@ static inline struct pci_dev *pci_get_class(unsigned int class,
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struct pci_dev *from)
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{ return NULL; }
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static inline struct pci_dev *pci_get_base_class(unsigned int class,
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struct pci_dev *from)
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{ return NULL; }
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static inline int pci_dev_present(const struct pci_device_id *ids)
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{ return 0; }
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