PCI/ERR: Add pcie_link_rcec() to associate RCiEPs (507b460f) · Commits · 戴 / test

drivers/pci/pci.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -472,9 +472,11 @@ static inline void pci_dpc_init(struct pci_dev *pdev) {}
		#ifdef CONFIG_PCIEPORTBUS
		void pci_rcec_init(struct pci_dev *dev);
		void pci_rcec_exit(struct pci_dev *dev);
		void pcie_link_rcec(struct pci_dev *rcec);
		#else
		static inline void pci_rcec_init(struct pci_dev *dev) {}
		static inline void pci_rcec_exit(struct pci_dev *dev) {}
		static inline void pcie_link_rcec(struct pci_dev *rcec) {}
		#endif

		#ifdef CONFIG_PCI_ATS

drivers/pci/pcie/portdrv_pci.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -111,6 +111,9 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
		(type != PCI_EXP_TYPE_RC_EC)))
		return -ENODEV;

		if (type == PCI_EXP_TYPE_RC_EC)
		pcie_link_rcec(dev);

		status = pcie_port_device_register(dev);
		if (status)
		return status;

drivers/pci/pcie/rcec.c

+94 −0

Original line number	Diff line number	Diff line
		@@ -15,6 +15,100 @@

		#include "../pci.h"

		struct walk_rcec_data {
		struct pci_dev *rcec;
		int (user_callback)(struct pci_dev dev, void *data);
		void *user_data;
		};

		static bool rcec_assoc_rciep(struct pci_dev rcec, struct pci_dev rciep)
		{
		unsigned long bitmap = rcec->rcec_ea->bitmap;
		unsigned int devn;

		/* An RCiEP found on a different bus in range */
		if (rcec->bus->number != rciep->bus->number)
		return true;

		/* Same bus, so check bitmap */
		for_each_set_bit(devn, &bitmap, 32)
		if (devn == rciep->devfn)
		return true;

		return false;
		}

		static int link_rcec_helper(struct pci_dev dev, void data)
		{
		struct walk_rcec_data *rcec_data = data;
		struct pci_dev *rcec = rcec_data->rcec;

		if ((pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) &&
		rcec_assoc_rciep(rcec, dev)) {
		dev->rcec = rcec;
		pci_dbg(dev, "PME & error events signaled via %s\n",
		pci_name(rcec));
		}

		return 0;
		}

		static void walk_rcec(int (cb)(struct pci_dev dev, void *data),
		void *userdata)
		{
		struct walk_rcec_data *rcec_data = userdata;
		struct pci_dev *rcec = rcec_data->rcec;
		u8 nextbusn, lastbusn;
		struct pci_bus *bus;
		unsigned int bnr;

		if (!rcec->rcec_ea)
		return;

		/* Walk own bus for bitmap based association */
		pci_walk_bus(rcec->bus, cb, rcec_data);

		nextbusn = rcec->rcec_ea->nextbusn;
		lastbusn = rcec->rcec_ea->lastbusn;

		/* All RCiEP devices are on the same bus as the RCEC */
		if (nextbusn == 0xff && lastbusn == 0x00)
		return;

		for (bnr = nextbusn; bnr <= lastbusn; bnr++) {
		/* No association indicated (PCIe 5.0-1, 7.9.10.3) */
		if (bnr == rcec->bus->number)
		continue;

		bus = pci_find_bus(pci_domain_nr(rcec->bus), bnr);
		if (!bus)
		continue;

		/* Find RCiEP devices on the given bus ranges */
		pci_walk_bus(bus, cb, rcec_data);
		}
		}

		/**
		* pcie_link_rcec - Link RCiEP devices associated with RCEC.
		* @rcec: RCEC whose RCiEP devices should be linked.
		*
		* Link the given RCEC to each RCiEP device found.
		*/
		void pcie_link_rcec(struct pci_dev *rcec)
		{
		struct walk_rcec_data rcec_data;

		if (!rcec->rcec_ea)
		return;

		rcec_data.rcec = rcec;
		rcec_data.user_callback = NULL;
		rcec_data.user_data = NULL;

		walk_rcec(link_rcec_helper, &rcec_data);
		}

		void pci_rcec_init(struct pci_dev *dev)
		{
		struct rcec_ea *rcec_ea;

include/linux/pci.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -330,6 +330,7 @@ struct pci_dev {
		#endif
		#ifdef CONFIG_PCIEPORTBUS
		struct rcec_ea rcec_ea; / RCEC cached endpoint association */
		struct pci_dev rcec; / Associated RCEC device */
		#endif
		u8 pcie_cap; /* PCIe capability offset */
		u8 msi_cap; /* MSI capability offset */

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