PCI: endpoint: Add new pci_epc_ops to get EPC features (41cb8d18) · Commits · 戴 / test

drivers/pci/endpoint/pci-epc-core.c

+30 −0

Original line number	Diff line number	Diff line
		@@ -83,6 +83,36 @@ err:
		}
		EXPORT_SYMBOL_GPL(pci_epc_get);

		/**
		* pci_epc_get_features() - get the features supported by EPC
		* @epc: the features supported by this EPC device will be returned
		* @func_no: the features supported by the EPC device specific to the
		* endpoint function with func_no will be returned
		*
		* Invoke to get the features provided by the EPC which may be
		* specific to an endpoint function. Returns pci_epc_features on success
		* and NULL for any failures.
		*/
		const struct pci_epc_features pci_epc_get_features(struct pci_epc epc,
		u8 func_no)
		{
		const struct pci_epc_features *epc_features;
		unsigned long flags;

		if (IS_ERR_OR_NULL(epc) \|\| func_no >= epc->max_functions)
		return NULL;

		if (!epc->ops->get_features)
		return NULL;

		spin_lock_irqsave(&epc->lock, flags);
		epc_features = epc->ops->get_features(epc, func_no);
		spin_unlock_irqrestore(&epc->lock, flags);

		return epc_features;
		}
		EXPORT_SYMBOL_GPL(pci_epc_get_features);

		/**
		* pci_epc_stop() - stop the PCI link
		* @epc: the link of the EPC device that has to be stopped

include/linux/pci-epc.h

+22 −0

Original line number	Diff line number	Diff line
		@@ -59,6 +59,8 @@ struct pci_epc_ops {
		enum pci_epc_irq_type type, u16 interrupt_num);
		int (start)(struct pci_epc epc);
		void (stop)(struct pci_epc epc);
		const struct pci_epc_features* (get_features)(struct pci_epc epc,
		u8 func_no);
		struct module *owner;
		};

		@@ -100,6 +102,24 @@ struct pci_epc {
		unsigned int features;
		};

		/**
		* struct pci_epc_features - features supported by a EPC device per function
		* @linkup_notifier: indicate if the EPC device can notify EPF driver on link up
		* @msi_capable: indicate if the endpoint function has MSI capability
		* @msix_capable: indicate if the endpoint function has MSI-X capability
		* @reserved_bar: bitmap to indicate reserved BAR unavailable to function driver
		* @bar_fixed_64bit: bitmap to indicate fixed 64bit BARs
		* @bar_fixed_size: Array specifying the size supported by each BAR
		*/
		struct pci_epc_features {
		unsigned int linkup_notifier : 1;
		unsigned int msi_capable : 1;
		unsigned int msix_capable : 1;
		u8 reserved_bar;
		u8 bar_fixed_64bit;
		u64 bar_fixed_size[BAR_5 + 1];
		};

		#define EPC_FEATURE_NO_LINKUP_NOTIFIER BIT(0)
		#define EPC_FEATURE_BAR_MASK (BIT(1) \| BIT(2) \| BIT(3))
		#define EPC_FEATURE_MSIX_AVAILABLE BIT(4)
		@@ -158,6 +178,8 @@ int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
		enum pci_epc_irq_type type, u16 interrupt_num);
		int pci_epc_start(struct pci_epc *epc);
		void pci_epc_stop(struct pci_epc *epc);
		const struct pci_epc_features pci_epc_get_features(struct pci_epc epc,
		u8 func_no);
		struct pci_epc pci_epc_get(const char epc_name);
		void pci_epc_put(struct pci_epc *epc);

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