Merge remote-tracking branch 'lorenzo/pci/cadence' into next

* lorenzo/pci/cadence:
  PCI: cadence: Add EndPoint Controller driver for Cadence PCIe controller
  dt-bindings: PCI: cadence: Add DT bindings for Cadence PCIe endpoint controller
  PCI: endpoint: Fix EPF device name to support multi-function devices
  PCI: endpoint: Add the function number as argument to EPC ops
  PCI: cadence: Add host driver for Cadence PCIe controller
  dt-bindings: PCI: cadence: Add DT bindings for Cadence PCIe host controller
  PCI: Add vendor ID for Cadence
  PCI: Add generic function to probe PCI host controllers
  PCI: generic: fix missing call of pci_free_resource_list()
  PCI: OF: Add generic function to parse and allocate PCI resources
  PCI: Regroup all PCI related entries into drivers/pci/Makefile

Conflicts:
	drivers/pci/of.c
	include/linux/pci.h

Documentation/devicetree/bindings/pci/cdns,cdns-pcie-ep.txt

+* Cadence PCIe endpoint controller
+
+Required properties:
+- compatible: Should contain "cdns,cdns-pcie-ep" to identify the IP used.
+- reg: Should contain the controller register base address and AXI interface
+  region base address respectively.
+- reg-names: Must be "reg" and "mem" respectively.
+- cdns,max-outbound-regions: Set to maximum number of outbound regions
+
+Optional properties:
+- max-functions: Maximum number of functions that can be configured (default 1).
+
+Example:
+
+pcie@fc000000 {
+	compatible = "cdns,cdns-pcie-ep";
+	reg = <0x0 0xfc000000 0x0 0x01000000>,
+	      <0x0 0x80000000 0x0 0x40000000>;
+	reg-names = "reg", "mem";
+	cdns,max-outbound-regions = <16>;
+	max-functions = /bits/ 8 <8>;
+};

Documentation/devicetree/bindings/pci/cdns,cdns-pcie-host.txt

+* Cadence PCIe host controller
+
+This PCIe controller inherits the base properties defined in
+host-generic-pci.txt.
+
+Required properties:
+- compatible: Should contain "cdns,cdns-pcie-host" to identify the IP used.
+- reg: Should contain the controller register base address, PCIe configuration
+  window base address, and AXI interface region base address respectively.
+- reg-names: Must be "reg", "cfg" and "mem" respectively.
+- #address-cells: Set to <3>
+- #size-cells: Set to <2>
+- device_type: Set to "pci"
+- ranges: Ranges for the PCI memory and I/O regions
+- #interrupt-cells: Set to <1>
+- interrupt-map-mask and interrupt-map: Standard PCI properties to define the
+  mapping of the PCIe interface to interrupt numbers.
+
+Optional properties:
+- cdns,max-outbound-regions: Set to maximum number of outbound regions
+  (default 32)
+- cdns,no-bar-match-nbits: Set into the no BAR match register to configure the
+  number of least significant bits kept during inbound (PCIe -> AXI) address
+  translations (default 32)
+- vendor-id: The PCI vendor ID (16 bits, default is design dependent)
+- device-id: The PCI device ID (16 bits, default is design dependent)
+
+Example:
+
+pcie@fb000000 {
+	compatible = "cdns,cdns-pcie-host";
+	device_type = "pci";
+	#address-cells = <3>;
+	#size-cells = <2>;
+	bus-range = <0x0 0xff>;
+	linux,pci-domain = <0>;
+	cdns,max-outbound-regions = <16>;
+	cdns,no-bar-match-nbits = <32>;
+	vendor-id = /bits/ 16 <0x17cd>;
+	device-id = /bits/ 16 <0x0200>;
+
+	reg = <0x0 0xfb000000  0x0 0x01000000>,
+	      <0x0 0x41000000  0x0 0x00001000>,
+	      <0x0 0x40000000  0x0 0x04000000>;
+	reg-names = "reg", "cfg", "mem";
+
+	ranges = <0x02000000 0x0 0x42000000  0x0 0x42000000  0x0 0x1000000>,
+		 <0x01000000 0x0 0x43000000  0x0 0x43000000  0x0 0x0010000>;
+
+	#interrupt-cells = <0x1>;
+
+	interrupt-map = <0x0 0x0 0x0  0x1  &gic  0x0 0x0 0x0 14 0x1
+			 0x0 0x0 0x0  0x2  &gic  0x0 0x0 0x0 15 0x1
+			 0x0 0x0 0x0  0x3  &gic  0x0 0x0 0x0 16 0x1
+			 0x0 0x0 0x0  0x4  &gic  0x0 0x0 0x0 17 0x1>;
+
+	interrupt-map-mask = <0x0 0x0 0x0  0x7>;
+
+	msi-parent = <&its_pci>;
+};

MAINTAINERS

@@ -10402,6 +10402,13 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/pci/pci-armada8k.txt
 F:	drivers/pci/dwc/pcie-armada8k.c
 
+PCI DRIVER FOR CADENCE PCIE IP
+M:	Alan Douglas <adouglas@cadence.com>
+L:	linux-pci@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/pci/cdns,*.txt
+F:	drivers/pci/cadence/pcie-cadence*
+
 PCI DRIVER FOR FREESCALE LAYERSCAPE
 M:	Minghuan Lian <minghuan.Lian@freescale.com>
 M:	Mingkai Hu <mingkai.hu@freescale.com>

drivers/Makefile

@@ -16,10 +16,7 @@ obj-$(CONFIG_PINCTRL)		+= pinctrl/
 obj-$(CONFIG_GPIOLIB)		+= gpio/
 obj-y				+= pwm/
 
-obj-$(CONFIG_PCI)		+= pci/
-obj-$(CONFIG_PCI_ENDPOINT)	+= pci/endpoint/
-# PCI dwc controller drivers
-obj-y				+= pci/dwc/
+obj-y				+= pci/
 
 obj-$(CONFIG_PARISC)		+= parisc/
 obj-$(CONFIG_RAPIDIO)		+= rapidio/

drivers/pci/Kconfig

@@ -125,6 +125,7 @@ config PCI_PASID
 
 config PCI_LABEL
 	def_bool y if (DMI || ACPI)
+	depends on PCI
 	select NLS
 
 config PCI_HYPERV
@@ -135,6 +136,7 @@ config PCI_HYPERV
           PCI devices from a PCI backend to support PCI driver domains.
 
 source "drivers/pci/hotplug/Kconfig"
+source "drivers/pci/cadence/Kconfig"
 source "drivers/pci/dwc/Kconfig"
 source "drivers/pci/host/Kconfig"
 source "drivers/pci/endpoint/Kconfig"

drivers/pci/Makefile

@@ -3,12 +3,15 @@
 # Makefile for the PCI bus specific drivers.
 #
 
-obj-y		+= access.o bus.o probe.o host-bridge.o remove.o pci.o \
+obj-$(CONFIG_PCI)	+= access.o bus.o probe.o host-bridge.o remove.o pci.o \
 			pci-driver.o search.o pci-sysfs.o rom.o setup-res.o \
 			irq.o vpd.o setup-bus.o vc.o mmap.o setup-irq.o
 
+ifdef CONFIG_PCI
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_SYSFS) += slot.o
+obj-$(CONFIG_OF) += of.o
+endif
 
 obj-$(CONFIG_PCI_QUIRKS) += quirks.o
 
@@ -44,10 +47,15 @@ obj-$(CONFIG_PCI_ECAM) += ecam.o
 
 obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += xen-pcifront.o
 
-obj-$(CONFIG_OF) += of.o
-
 ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG
 
 # PCI host controller drivers
 obj-y += host/
 obj-y += switch/
+
+obj-$(CONFIG_PCI_ENDPOINT)	+= endpoint/
+
+# Endpoint library must be initialized before its users
+obj-$(CONFIG_PCIE_CADENCE)	+= cadence/
+# pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW
+obj-y				+= dwc/

drivers/pci/cadence/Kconfig

+menu "Cadence PCIe controllers support"
+
+config PCIE_CADENCE
+	bool
+
+config PCIE_CADENCE_HOST
+	bool "Cadence PCIe host controller"
+	depends on OF
+	depends on PCI
+	select IRQ_DOMAIN
+	select PCIE_CADENCE
+	help
+	  Say Y here if you want to support the Cadence PCIe controller in host
+	  mode. This PCIe controller may be embedded into many different vendors
+	  SoCs.
+
+config PCIE_CADENCE_EP
+	bool "Cadence PCIe endpoint controller"
+	depends on OF
+	depends on PCI_ENDPOINT
+	select PCIE_CADENCE
+	help
+	  Say Y here if you want to support the Cadence PCIe  controller in
+	  endpoint mode. This PCIe controller may be embedded into many
+	  different vendors SoCs.
+
+endmenu

drivers/pci/cadence/Makefile

+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_PCIE_CADENCE) += pcie-cadence.o
+obj-$(CONFIG_PCIE_CADENCE_HOST) += pcie-cadence-host.o
+obj-$(CONFIG_PCIE_CADENCE_EP) += pcie-cadence-ep.o

drivers/pci/cadence/pcie-cadence-host.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017 Cadence
+// Cadence PCIe host controller driver.
+// Author: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>
+
+#include <linux/kernel.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include "pcie-cadence.h"
+
+/**
+ * struct cdns_pcie_rc - private data for this PCIe Root Complex driver
+ * @pcie: Cadence PCIe controller
+ * @dev: pointer to PCIe device
+ * @cfg_res: start/end offsets in the physical system memory to map PCI
+ *           configuration space accesses
+ * @bus_range: first/last buses behind the PCIe host controller
+ * @cfg_base: IO mapped window to access the PCI configuration space of a
+ *            single function at a time
+ * @max_regions: maximum number of regions supported by the hardware
+ * @no_bar_nbits: Number of bits to keep for inbound (PCIe -> CPU) address
+ *                translation (nbits sets into the "no BAR match" register)
+ * @vendor_id: PCI vendor ID
+ * @device_id: PCI device ID
+ */
+struct cdns_pcie_rc {
+	struct cdns_pcie	pcie;
+	struct device		*dev;
+	struct resource		*cfg_res;
+	struct resource		*bus_range;
+	void __iomem		*cfg_base;
+	u32			max_regions;
+	u32			no_bar_nbits;
+	u16			vendor_id;
+	u16			device_id;
+};
+
+static void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
+				      int where)
+{
+	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
+	struct cdns_pcie_rc *rc = pci_host_bridge_priv(bridge);
+	struct cdns_pcie *pcie = &rc->pcie;
+	unsigned int busn = bus->number;
+	u32 addr0, desc0;
+
+	if (busn == rc->bus_range->start) {
+		/*
+		 * Only the root port (devfn == 0) is connected to this bus.
+		 * All other PCI devices are behind some bridge hence on another
+		 * bus.
+		 */
+		if (devfn)
+			return NULL;
+
+		return pcie->reg_base + (where & 0xfff);
+	}
+
+	/* Update Output registers for AXI region 0. */
+	addr0 = CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_NBITS(12) |
+		CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_DEVFN(devfn) |
+		CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_BUS(busn);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR0(0), addr0);
+
+	/* Configuration Type 0 or Type 1 access. */
+	desc0 = CDNS_PCIE_AT_OB_REGION_DESC0_HARDCODED_RID |
+		CDNS_PCIE_AT_OB_REGION_DESC0_DEVFN(0);
+	/*
+	 * The bus number was already set once for all in desc1 by
+	 * cdns_pcie_host_init_address_translation().
+	 */
+	if (busn == rc->bus_range->start + 1)
+		desc0 |= CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_CONF_TYPE0;
+	else
+		desc0 |= CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_CONF_TYPE1;
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC0(0), desc0);
+
+	return rc->cfg_base + (where & 0xfff);
+}
+
+static struct pci_ops cdns_pcie_host_ops = {
+	.map_bus	= cdns_pci_map_bus,
+	.read		= pci_generic_config_read,
+	.write		= pci_generic_config_write,
+};
+
+static const struct of_device_id cdns_pcie_host_of_match[] = {
+	{ .compatible = "cdns,cdns-pcie-host" },
+
+	{ },
+};
+
+static int cdns_pcie_host_init_root_port(struct cdns_pcie_rc *rc)
+{
+	struct cdns_pcie *pcie = &rc->pcie;
+	u32 value, ctrl;
+
+	/*
+	 * Set the root complex BAR configuration register:
+	 * - disable both BAR0 and BAR1.
+	 * - enable Prefetchable Memory Base and Limit registers in type 1
+	 *   config space (64 bits).
+	 * - enable IO Base and Limit registers in type 1 config
+	 *   space (32 bits).
+	 */
+	ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_DISABLED;
+	value = CDNS_PCIE_LM_RC_BAR_CFG_BAR0_CTRL(ctrl) |
+		CDNS_PCIE_LM_RC_BAR_CFG_BAR1_CTRL(ctrl) |
+		CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_ENABLE |
+		CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_64BITS |
+		CDNS_PCIE_LM_RC_BAR_CFG_IO_ENABLE |
+		CDNS_PCIE_LM_RC_BAR_CFG_IO_32BITS;
+	cdns_pcie_writel(pcie, CDNS_PCIE_LM_RC_BAR_CFG, value);
+
+	/* Set root port configuration space */
+	if (rc->vendor_id != 0xffff)
+		cdns_pcie_rp_writew(pcie, PCI_VENDOR_ID, rc->vendor_id);
+	if (rc->device_id != 0xffff)
+		cdns_pcie_rp_writew(pcie, PCI_DEVICE_ID, rc->device_id);
+
+	cdns_pcie_rp_writeb(pcie, PCI_CLASS_REVISION, 0);
+	cdns_pcie_rp_writeb(pcie, PCI_CLASS_PROG, 0);
+	cdns_pcie_rp_writew(pcie, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI);
+
+	return 0;
+}
+
+static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
+{
+	struct cdns_pcie *pcie = &rc->pcie;
+	struct resource *cfg_res = rc->cfg_res;
+	struct resource *mem_res = pcie->mem_res;
+	struct resource *bus_range = rc->bus_range;
+	struct device *dev = rc->dev;
+	struct device_node *np = dev->of_node;
+	struct of_pci_range_parser parser;
+	struct of_pci_range range;
+	u32 addr0, addr1, desc1;
+	u64 cpu_addr;
+	int r, err;
+
+	/*
+	 * Reserve region 0 for PCI configure space accesses:
+	 * OB_REGION_PCI_ADDR0 and OB_REGION_DESC0 are updated dynamically by
+	 * cdns_pci_map_bus(), other region registers are set here once for all.
+	 */
+	addr1 = 0; /* Should be programmed to zero. */
+	desc1 = CDNS_PCIE_AT_OB_REGION_DESC1_BUS(bus_range->start);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(0), addr1);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(0), desc1);
+
+	cpu_addr = cfg_res->start - mem_res->start;
+	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(12) |
+		(lower_32_bits(cpu_addr) & GENMASK(31, 8));
+	addr1 = upper_32_bits(cpu_addr);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(0), addr0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(0), addr1);
+
+	err = of_pci_range_parser_init(&parser, np);
+	if (err)
+		return err;
+
+	r = 1;
+	for_each_of_pci_range(&parser, &range) {
+		bool is_io;
+
+		if (r >= rc->max_regions)
+			break;
+
+		if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
+			is_io = false;
+		else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
+			is_io = true;
+		else
+			continue;
+
+		cdns_pcie_set_outbound_region(pcie, 0, r, is_io,
+					      range.cpu_addr,
+					      range.pci_addr,
+					      range.size);
+		r++;
+	}
+
+	/*
+	 * Set Root Port no BAR match Inbound Translation registers:
+	 * needed for MSI and DMA.
+	 * Root Port BAR0 and BAR1 are disabled, hence no need to set their
+	 * inbound translation registers.
+	 */
+	addr0 = CDNS_PCIE_AT_IB_RP_BAR_ADDR0_NBITS(rc->no_bar_nbits);
+	addr1 = 0;
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_RP_BAR_ADDR0(RP_NO_BAR), addr0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_RP_BAR_ADDR1(RP_NO_BAR), addr1);
+
+	return 0;
+}
+
+static int cdns_pcie_host_init(struct device *dev,
+			       struct list_head *resources,
+			       struct cdns_pcie_rc *rc)
+{
+	struct resource *bus_range = NULL;
+	int err;
+
+	/* Parse our PCI ranges and request their resources */
+	err = pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
+	if (err)
+		return err;
+
+	rc->bus_range = bus_range;
+	rc->pcie.bus = bus_range->start;
+
+	err = cdns_pcie_host_init_root_port(rc);
+	if (err)
+		goto err_out;
+
+	err = cdns_pcie_host_init_address_translation(rc);
+	if (err)
+		goto err_out;
+
+	return 0;
+
+ err_out:
+	pci_free_resource_list(resources);
+	return err;
+}
+
+static int cdns_pcie_host_probe(struct platform_device *pdev)
+{
+	const char *type;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct pci_host_bridge *bridge;
+	struct list_head resources;
+	struct cdns_pcie_rc *rc;
+	struct cdns_pcie *pcie;
+	struct resource *res;
+	int ret;
+
+	bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
+	if (!bridge)
+		return -ENOMEM;
+
+	rc = pci_host_bridge_priv(bridge);
+	rc->dev = dev;
+
+	pcie = &rc->pcie;
+	pcie->is_rc = true;
+
+	rc->max_regions = 32;
+	of_property_read_u32(np, "cdns,max-outbound-regions", &rc->max_regions);
+
+	rc->no_bar_nbits = 32;
+	of_property_read_u32(np, "cdns,no-bar-match-nbits", &rc->no_bar_nbits);
+
+	rc->vendor_id = 0xffff;
+	of_property_read_u16(np, "vendor-id", &rc->vendor_id);
+
+	rc->device_id = 0xffff;
+	of_property_read_u16(np, "device-id", &rc->device_id);
+
+	type = of_get_property(np, "device_type", NULL);
+	if (!type || strcmp(type, "pci")) {
+		dev_err(dev, "invalid \"device_type\" %s\n", type);
+		return -EINVAL;
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg");
+	pcie->reg_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(pcie->reg_base)) {
+		dev_err(dev, "missing \"reg\"\n");
+		return PTR_ERR(pcie->reg_base);
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
+	rc->cfg_base = devm_pci_remap_cfg_resource(dev, res);
+	if (IS_ERR(rc->cfg_base)) {
+		dev_err(dev, "missing \"cfg\"\n");
+		return PTR_ERR(rc->cfg_base);
+	}
+	rc->cfg_res = res;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
+	if (!res) {
+		dev_err(dev, "missing \"mem\"\n");
+		return -EINVAL;
+	}
+	pcie->mem_res = res;
+
+	pm_runtime_enable(dev);
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "pm_runtime_get_sync() failed\n");
+		goto err_get_sync;
+	}
+
+	ret = cdns_pcie_host_init(dev, &resources, rc);
+	if (ret)
+		goto err_init;
+
+	list_splice_init(&resources, &bridge->windows);
+	bridge->dev.parent = dev;
+	bridge->busnr = pcie->bus;
+	bridge->ops = &cdns_pcie_host_ops;
+	bridge->map_irq = of_irq_parse_and_map_pci;
+	bridge->swizzle_irq = pci_common_swizzle;
+
+	ret = pci_host_probe(bridge);
+	if (ret < 0)
+		goto err_host_probe;
+
+	return 0;
+
+ err_host_probe:
+	pci_free_resource_list(&resources);
+
+ err_init:
+	pm_runtime_put_sync(dev);
+
+ err_get_sync:
+	pm_runtime_disable(dev);
+
+	return ret;
+}
+
+static struct platform_driver cdns_pcie_host_driver = {
+	.driver = {
+		.name = "cdns-pcie-host",
+		.of_match_table = cdns_pcie_host_of_match,
+	},
+	.probe = cdns_pcie_host_probe,
+};
+builtin_platform_driver(cdns_pcie_host_driver);

drivers/pci/cadence/pcie-cadence.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017 Cadence
+// Cadence PCIe controller driver.
+// Author: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>
+
+#include <linux/kernel.h>
+
+#include "pcie-cadence.h"
+
+void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u8 fn,
+				   u32 r, bool is_io,
+				   u64 cpu_addr, u64 pci_addr, size_t size)
+{
+	/*
+	 * roundup_pow_of_two() returns an unsigned long, which is not suited
+	 * for 64bit values.
+	 */
+	u64 sz = 1ULL << fls64(size - 1);
+	int nbits = ilog2(sz);
+	u32 addr0, addr1, desc0, desc1;
+
+	if (nbits < 8)
+		nbits = 8;
+
+	/* Set the PCI address */
+	addr0 = CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_NBITS(nbits) |
+		(lower_32_bits(pci_addr) & GENMASK(31, 8));
+	addr1 = upper_32_bits(pci_addr);
+
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR0(r), addr0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(r), addr1);
+
+	/* Set the PCIe header descriptor */
+	if (is_io)
+		desc0 = CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_IO;
+	else
+		desc0 = CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_MEM;
+	desc1 = 0;
+
+	/*
+	 * Whatever Bit [23] is set or not inside DESC0 register of the outbound
+	 * PCIe descriptor, the PCI function number must be set into
+	 * Bits [26:24] of DESC0 anyway.
+	 *
+	 * In Root Complex mode, the function number is always 0 but in Endpoint
+	 * mode, the PCIe controller may support more than one function. This
+	 * function number needs to be set properly into the outbound PCIe
+	 * descriptor.
+	 *
+	 * Besides, setting Bit [23] is mandatory when in Root Complex mode:
+	 * then the driver must provide the bus, resp. device, number in
+	 * Bits [7:0] of DESC1, resp. Bits[31:27] of DESC0. Like the function
+	 * number, the device number is always 0 in Root Complex mode.
+	 *
+	 * However when in Endpoint mode, we can clear Bit [23] of DESC0, hence
+	 * the PCIe controller will use the captured values for the bus and
+	 * device numbers.
+	 */
+	if (pcie->is_rc) {
+		/* The device and function numbers are always 0. */
+		desc0 |= CDNS_PCIE_AT_OB_REGION_DESC0_HARDCODED_RID |
+			 CDNS_PCIE_AT_OB_REGION_DESC0_DEVFN(0);
+		desc1 |= CDNS_PCIE_AT_OB_REGION_DESC1_BUS(pcie->bus);
+	} else {
+		/*
+		 * Use captured values for bus and device numbers but still
+		 * need to set the function number.
+		 */
+		desc0 |= CDNS_PCIE_AT_OB_REGION_DESC0_DEVFN(fn);
+	}
+
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC0(r), desc0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(r), desc1);
+
+	/* Set the CPU address */
+	cpu_addr -= pcie->mem_res->start;
+	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(nbits) |
+		(lower_32_bits(cpu_addr) & GENMASK(31, 8));
+	addr1 = upper_32_bits(cpu_addr);
+
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r), addr0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), addr1);
+}
+
+void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie, u8 fn,
+						  u32 r, u64 cpu_addr)
+{
+	u32 addr0, addr1, desc0, desc1;
+
+	desc0 = CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_NORMAL_MSG;
+	desc1 = 0;
+
+	/* See cdns_pcie_set_outbound_region() comments above. */
+	if (pcie->is_rc) {
+		desc0 |= CDNS_PCIE_AT_OB_REGION_DESC0_HARDCODED_RID |
+			 CDNS_PCIE_AT_OB_REGION_DESC0_DEVFN(0);
+		desc1 |= CDNS_PCIE_AT_OB_REGION_DESC1_BUS(pcie->bus);
+	} else {
+		desc0 |= CDNS_PCIE_AT_OB_REGION_DESC0_DEVFN(fn);
+	}
+
+	/* Set the CPU address */
+	cpu_addr -= pcie->mem_res->start;
+	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(17) |
+		(lower_32_bits(cpu_addr) & GENMASK(31, 8));
+	addr1 = upper_32_bits(cpu_addr);
+
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR0(r), 0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(r), 0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC0(r), desc0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(r), desc1);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r), addr0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), addr1);
+}
+
+void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r)
+{
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR0(r), 0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(r), 0);
+
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC0(r), 0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(r), 0);
+
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r), 0);
+	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), 0);
+}

drivers/pci/dwc/Makefile

@@ -27,4 +27,6 @@ obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o
 # ARM64 and use internal ifdefs to only build the pieces we need
 # depending on whether ACPI, the DT driver, or both are enabled.
 
+ifdef CONFIG_PCI
 obj-$(CONFIG_ARM64) += pcie-hisi.o
+endif

drivers/pci/dwc/pcie-designware-ep.c

@@ -39,7 +39,7 @@ static void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
 	dw_pcie_writel_dbi(pci, reg, 0x0);
 }
 
-static int dw_pcie_ep_write_header(struct pci_epc *epc,
+static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no,
 				   struct pci_epf_header *hdr)
 {
 	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
@@ -112,7 +112,8 @@ static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, phys_addr_t phys_addr,
 	return 0;
 }
 
-static void dw_pcie_ep_clear_bar(struct pci_epc *epc, enum pci_barno bar)
+static void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no,
+				 enum pci_barno bar)
 {
 	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
@@ -124,7 +125,8 @@ static void dw_pcie_ep_clear_bar(struct pci_epc *epc, enum pci_barno bar)
 	clear_bit(atu_index, &ep->ib_window_map);
 }
 
-static int dw_pcie_ep_set_bar(struct pci_epc *epc, enum pci_barno bar,
+static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
+			      enum pci_barno bar,
 			      dma_addr_t bar_phys, size_t size, int flags)
 {
 	int ret;
@@ -163,7 +165,8 @@ static int dw_pcie_find_index(struct dw_pcie_ep *ep, phys_addr_t addr,
 	return -EINVAL;
 }
 
-static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, phys_addr_t addr)
+static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, u8 func_no,
+				  phys_addr_t addr)
 {
 	int ret;
 	u32 atu_index;
@@ -178,7 +181,8 @@ static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, phys_addr_t addr)
 	clear_bit(atu_index, &ep->ob_window_map);
 }
 
-static int dw_pcie_ep_map_addr(struct pci_epc *epc, phys_addr_t addr,
+static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no,
+			       phys_addr_t addr,
 			       u64 pci_addr, size_t size)
 {
 	int ret;
@@ -194,7 +198,7 @@ static int dw_pcie_ep_map_addr(struct pci_epc *epc, phys_addr_t addr,
 	return 0;
 }
 
-static int dw_pcie_ep_get_msi(struct pci_epc *epc)
+static int dw_pcie_ep_get_msi(struct pci_epc *epc, u8 func_no)
 {
 	int val;
 	u32 lower_addr;
@@ -214,7 +218,7 @@ static int dw_pcie_ep_get_msi(struct pci_epc *epc)
 	return val;
 }
 
-static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 encode_int)
+static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 func_no, u8 encode_int)
 {
 	int val;
 	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
@@ -226,7 +230,7 @@ static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 encode_int)
 	return 0;
 }
 
-static int dw_pcie_ep_raise_irq(struct pci_epc *epc,
+static int dw_pcie_ep_raise_irq(struct pci_epc *epc, u8 func_no,
 				enum pci_epc_irq_type type, u8 interrupt_num)
 {
 	struct dw_pcie_ep *ep = epc_get_drvdata(epc);

drivers/pci/endpoint/functions/pci-epf-test.c

@@ -104,7 +104,8 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
 		goto err;
 	}
 
-	ret = pci_epc_map_addr(epc, src_phys_addr, reg->src_addr, reg->size);
+	ret = pci_epc_map_addr(epc, epf->func_no, src_phys_addr, reg->src_addr,
+			       reg->size);
 	if (ret) {
 		dev_err(dev, "failed to map source address\n");
 		reg->status = STATUS_SRC_ADDR_INVALID;
@@ -119,7 +120,8 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
 		goto err_src_map_addr;
 	}
 
-	ret = pci_epc_map_addr(epc, dst_phys_addr, reg->dst_addr, reg->size);
+	ret = pci_epc_map_addr(epc, epf->func_no, dst_phys_addr, reg->dst_addr,
+			       reg->size);
 	if (ret) {
 		dev_err(dev, "failed to map destination address\n");
 		reg->status = STATUS_DST_ADDR_INVALID;
@@ -128,13 +130,13 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
 
 	memcpy(dst_addr, src_addr, reg->size);
 
-	pci_epc_unmap_addr(epc, dst_phys_addr);
+	pci_epc_unmap_addr(epc, epf->func_no, dst_phys_addr);
 
 err_dst_addr:
 	pci_epc_mem_free_addr(epc, dst_phys_addr, dst_addr, reg->size);
 
 err_src_map_addr:
-	pci_epc_unmap_addr(epc, src_phys_addr);
+	pci_epc_unmap_addr(epc, epf->func_no, src_phys_addr);
 
 err_src_addr:
 	pci_epc_mem_free_addr(epc, src_phys_addr, src_addr, reg->size);
@@ -164,7 +166,8 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
 		goto err;
 	}
 
-	ret = pci_epc_map_addr(epc, phys_addr, reg->src_addr, reg->size);
+	ret = pci_epc_map_addr(epc, epf->func_no, phys_addr, reg->src_addr,
+			       reg->size);
 	if (ret) {
 		dev_err(dev, "failed to map address\n");
 		reg->status = STATUS_SRC_ADDR_INVALID;
@@ -186,7 +189,7 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
 	kfree(buf);
 
 err_map_addr:
-	pci_epc_unmap_addr(epc, phys_addr);
+	pci_epc_unmap_addr(epc, epf->func_no, phys_addr);
 
 err_addr:
 	pci_epc_mem_free_addr(epc, phys_addr, src_addr, reg->size);
@@ -215,7 +218,8 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
 		goto err;
 	}
 
-	ret = pci_epc_map_addr(epc, phys_addr, reg->dst_addr, reg->size);
+	ret = pci_epc_map_addr(epc, epf->func_no, phys_addr, reg->dst_addr,
+			       reg->size);
 	if (ret) {
 		dev_err(dev, "failed to map address\n");
 		reg->status = STATUS_DST_ADDR_INVALID;
@@ -242,7 +246,7 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
 	kfree(buf);
 
 err_map_addr:
-	pci_epc_unmap_addr(epc, phys_addr);
+	pci_epc_unmap_addr(epc, epf->func_no, phys_addr);
 
 err_addr:
 	pci_epc_mem_free_addr(epc, phys_addr, dst_addr, reg->size);
@@ -260,11 +264,11 @@ static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test, u8 irq)
 	struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
 
 	reg->status |= STATUS_IRQ_RAISED;
-	msi_count = pci_epc_get_msi(epc);
+	msi_count = pci_epc_get_msi(epc, epf->func_no);
 	if (irq > msi_count || msi_count <= 0)
-		pci_epc_raise_irq(epc, PCI_EPC_IRQ_LEGACY, 0);
+		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_LEGACY, 0);
 	else
-		pci_epc_raise_irq(epc, PCI_EPC_IRQ_MSI, irq);
+		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, irq);
 }
 
 static void pci_epf_test_cmd_handler(struct work_struct *work)
@@ -291,7 +295,7 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
 
 	if (command & COMMAND_RAISE_LEGACY_IRQ) {
 		reg->status = STATUS_IRQ_RAISED;
-		pci_epc_raise_irq(epc, PCI_EPC_IRQ_LEGACY, 0);
+		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_LEGACY, 0);
 		goto reset_handler;
 	}
 
@@ -326,11 +330,11 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
 	}
 
 	if (command & COMMAND_RAISE_MSI_IRQ) {
-		msi_count = pci_epc_get_msi(epc);
+		msi_count = pci_epc_get_msi(epc, epf->func_no);
 		if (irq > msi_count || msi_count <= 0)
 			goto reset_handler;
 		reg->status = STATUS_IRQ_RAISED;
-		pci_epc_raise_irq(epc, PCI_EPC_IRQ_MSI, irq);
+		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, irq);
 		goto reset_handler;
 	}
 
@@ -358,7 +362,7 @@ static void pci_epf_test_unbind(struct pci_epf *epf)
 	for (bar = BAR_0; bar <= BAR_5; bar++) {
 		if (epf_test->reg[bar]) {
 			pci_epf_free_space(epf, epf_test->reg[bar], bar);
-			pci_epc_clear_bar(epc, bar);
+			pci_epc_clear_bar(epc, epf->func_no, bar);
 		}
 	}
 }
@@ -380,7 +384,8 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
 
 	for (bar = BAR_0; bar <= BAR_5; bar++) {
 		epf_bar = &epf->bar[bar];
-		ret = pci_epc_set_bar(epc, bar, epf_bar->phys_addr,
+		ret = pci_epc_set_bar(epc, epf->func_no, bar,
+				      epf_bar->phys_addr,
 				      epf_bar->size, flags);
 		if (ret) {
 			pci_epf_free_space(epf, epf_test->reg[bar], bar);
@@ -433,7 +438,7 @@ static int pci_epf_test_bind(struct pci_epf *epf)
 	if (WARN_ON_ONCE(!epc))
 		return -EINVAL;
 
-	ret = pci_epc_write_header(epc, header);
+	ret = pci_epc_write_header(epc, epf->func_no, header);
 	if (ret) {
 		dev_err(dev, "configuration header write failed\n");
 		return ret;
@@ -447,7 +452,7 @@ static int pci_epf_test_bind(struct pci_epf *epf)
 	if (ret)
 		return ret;
 
-	ret = pci_epc_set_msi(epc, epf->msi_interrupts);
+	ret = pci_epc_set_msi(epc, epf->func_no, epf->msi_interrupts);
 	if (ret)
 		return ret;
 

drivers/pci/endpoint/pci-ep-cfs.c

@@ -18,18 +18,22 @@
  */
 
 #include <linux/module.h>
+#include <linux/idr.h>
 #include <linux/slab.h>
 
 #include <linux/pci-epc.h>
 #include <linux/pci-epf.h>
 #include <linux/pci-ep-cfs.h>
 
+static DEFINE_IDR(functions_idr);
+static DEFINE_MUTEX(functions_mutex);
 static struct config_group *functions_group;
 static struct config_group *controllers_group;
 
 struct pci_epf_group {
 	struct config_group group;
 	struct pci_epf *epf;
+	int index;
 };
 
 struct pci_epc_group {
@@ -353,6 +357,9 @@ static void pci_epf_release(struct config_item *item)
 {
 	struct pci_epf_group *epf_group = to_pci_epf_group(item);
 
+	mutex_lock(&functions_mutex);
+	idr_remove(&functions_idr, epf_group->index);
+	mutex_unlock(&functions_mutex);
 	pci_epf_destroy(epf_group->epf);
 	kfree(epf_group);
 }
@@ -372,22 +379,57 @@ static struct config_group *pci_epf_make(struct config_group *group,
 {
 	struct pci_epf_group *epf_group;
 	struct pci_epf *epf;
+	char *epf_name;
+	int index, err;
 
 	epf_group = kzalloc(sizeof(*epf_group), GFP_KERNEL);
 	if (!epf_group)
 		return ERR_PTR(-ENOMEM);
 
+	mutex_lock(&functions_mutex);
+	index = idr_alloc(&functions_idr, epf_group, 0, 0, GFP_KERNEL);
+	mutex_unlock(&functions_mutex);
+	if (index < 0) {
+		err = index;
+		goto free_group;
+	}
+
+	epf_group->index = index;
+
 	config_group_init_type_name(&epf_group->group, name, &pci_epf_type);
 
-	epf = pci_epf_create(group->cg_item.ci_name);
+	epf_name = kasprintf(GFP_KERNEL, "%s.%d",
+			     group->cg_item.ci_name, epf_group->index);
+	if (!epf_name) {
+		err = -ENOMEM;
+		goto remove_idr;
+	}
+
+	epf = pci_epf_create(epf_name);
 	if (IS_ERR(epf)) {
 		pr_err("failed to create endpoint function device\n");
-		return ERR_PTR(-EINVAL);
+		err = -EINVAL;
+		goto free_name;
 	}
 
 	epf_group->epf = epf;
 
+	kfree(epf_name);
+
 	return &epf_group->group;
+
+free_name:
+	kfree(epf_name);
+
+remove_idr:
+	mutex_lock(&functions_mutex);
+	idr_remove(&functions_idr, epf_group->index);
+	mutex_unlock(&functions_mutex);
+
+free_group:
+	kfree(epf_group);
+
+	return ERR_PTR(err);
 }
 
 static void pci_epf_drop(struct config_group *group, struct config_item *item)

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

@@ -142,25 +142,26 @@ EXPORT_SYMBOL_GPL(pci_epc_start);
 /**
  * pci_epc_raise_irq() - interrupt the host system
  * @epc: the EPC device which has to interrupt the host
+ * @func_no: the endpoint function number in the EPC device
  * @type: specify the type of interrupt; legacy or MSI
  * @interrupt_num: the MSI interrupt number
  *
  * Invoke to raise an MSI or legacy interrupt
  */
-int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type,
-		      u8 interrupt_num)
+int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
+		      enum pci_epc_irq_type type, u8 interrupt_num)
 {
 	int ret;
 	unsigned long flags;
 
-	if (IS_ERR(epc))
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return -EINVAL;
 
 	if (!epc->ops->raise_irq)
 		return 0;
 
 	spin_lock_irqsave(&epc->lock, flags);
-	ret = epc->ops->raise_irq(epc, type, interrupt_num);
+	ret = epc->ops->raise_irq(epc, func_no, type, interrupt_num);
 	spin_unlock_irqrestore(&epc->lock, flags);
 
 	return ret;
@@ -170,22 +171,23 @@ EXPORT_SYMBOL_GPL(pci_epc_raise_irq);
 /**
  * pci_epc_get_msi() - get the number of MSI interrupt numbers allocated
  * @epc: the EPC device to which MSI interrupts was requested
+ * @func_no: the endpoint function number in the EPC device
  *
  * Invoke to get the number of MSI interrupts allocated by the RC
  */
-int pci_epc_get_msi(struct pci_epc *epc)
+int pci_epc_get_msi(struct pci_epc *epc, u8 func_no)
 {
 	int interrupt;
 	unsigned long flags;
 
-	if (IS_ERR(epc))
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return 0;
 
 	if (!epc->ops->get_msi)
 		return 0;
 
 	spin_lock_irqsave(&epc->lock, flags);
-	interrupt = epc->ops->get_msi(epc);
+	interrupt = epc->ops->get_msi(epc, func_no);
 	spin_unlock_irqrestore(&epc->lock, flags);
 
 	if (interrupt < 0)
@@ -200,17 +202,18 @@ EXPORT_SYMBOL_GPL(pci_epc_get_msi);
 /**
  * pci_epc_set_msi() - set the number of MSI interrupt numbers required
  * @epc: the EPC device on which MSI has to be configured
+ * @func_no: the endpoint function number in the EPC device
  * @interrupts: number of MSI interrupts required by the EPF
  *
  * Invoke to set the required number of MSI interrupts.
  */
-int pci_epc_set_msi(struct pci_epc *epc, u8 interrupts)
+int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts)
 {
 	int ret;
 	u8 encode_int;
 	unsigned long flags;
 
-	if (IS_ERR(epc))
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return -EINVAL;
 
 	if (!epc->ops->set_msi)
@@ -219,7 +222,7 @@ int pci_epc_set_msi(struct pci_epc *epc, u8 interrupts)
 	encode_int = order_base_2(interrupts);
 
 	spin_lock_irqsave(&epc->lock, flags);
-	ret = epc->ops->set_msi(epc, encode_int);
+	ret = epc->ops->set_msi(epc, func_no, encode_int);
 	spin_unlock_irqrestore(&epc->lock, flags);
 
 	return ret;
@@ -229,22 +232,24 @@ EXPORT_SYMBOL_GPL(pci_epc_set_msi);
 /**
  * pci_epc_unmap_addr() - unmap CPU address from PCI address
  * @epc: the EPC device on which address is allocated
+ * @func_no: the endpoint function number in the EPC device
  * @phys_addr: physical address of the local system
  *
  * Invoke to unmap the CPU address from PCI address.
  */
-void pci_epc_unmap_addr(struct pci_epc *epc, phys_addr_t phys_addr)
+void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
+			phys_addr_t phys_addr)
 {
 	unsigned long flags;
 
-	if (IS_ERR(epc))
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return;
 
 	if (!epc->ops->unmap_addr)
 		return;
 
 	spin_lock_irqsave(&epc->lock, flags);
-	epc->ops->unmap_addr(epc, phys_addr);
+	epc->ops->unmap_addr(epc, func_no, phys_addr);
 	spin_unlock_irqrestore(&epc->lock, flags);
 }
 EXPORT_SYMBOL_GPL(pci_epc_unmap_addr);
@@ -252,26 +257,27 @@ EXPORT_SYMBOL_GPL(pci_epc_unmap_addr);
 /**
  * pci_epc_map_addr() - map CPU address to PCI address
  * @epc: the EPC device on which address is allocated
+ * @func_no: the endpoint function number in the EPC device
  * @phys_addr: physical address of the local system
  * @pci_addr: PCI address to which the physical address should be mapped
  * @size: the size of the allocation
  *
  * Invoke to map CPU address with PCI address.
  */
-int pci_epc_map_addr(struct pci_epc *epc, phys_addr_t phys_addr,
-		     u64 pci_addr, size_t size)
+int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
+		     phys_addr_t phys_addr, u64 pci_addr, size_t size)
 {
 	int ret;
 	unsigned long flags;
 
-	if (IS_ERR(epc))
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return -EINVAL;
 
 	if (!epc->ops->map_addr)
 		return 0;
 
 	spin_lock_irqsave(&epc->lock, flags);
-	ret = epc->ops->map_addr(epc, phys_addr, pci_addr, size);
+	ret = epc->ops->map_addr(epc, func_no, phys_addr, pci_addr, size);
 	spin_unlock_irqrestore(&epc->lock, flags);
 
 	return ret;
@@ -281,22 +287,23 @@ EXPORT_SYMBOL_GPL(pci_epc_map_addr);
 /**
  * pci_epc_clear_bar() - reset the BAR
  * @epc: the EPC device for which the BAR has to be cleared
+ * @func_no: the endpoint function number in the EPC device
  * @bar: the BAR number that has to be reset
  *
  * Invoke to reset the BAR of the endpoint device.
  */
-void pci_epc_clear_bar(struct pci_epc *epc, int bar)
+void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, int bar)
 {
 	unsigned long flags;
 
-	if (IS_ERR(epc))
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return;
 
 	if (!epc->ops->clear_bar)
 		return;
 
 	spin_lock_irqsave(&epc->lock, flags);
-	epc->ops->clear_bar(epc, bar);
+	epc->ops->clear_bar(epc, func_no, bar);
 	spin_unlock_irqrestore(&epc->lock, flags);
 }
 EXPORT_SYMBOL_GPL(pci_epc_clear_bar);
@@ -304,26 +311,27 @@ EXPORT_SYMBOL_GPL(pci_epc_clear_bar);
 /**
  * pci_epc_set_bar() - configure BAR in order for host to assign PCI addr space
  * @epc: the EPC device on which BAR has to be configured
+ * @func_no: the endpoint function number in the EPC device
  * @bar: the BAR number that has to be configured
  * @size: the size of the addr space
  * @flags: specify memory allocation/io allocation/32bit address/64 bit address
  *
  * Invoke to configure the BAR of the endpoint device.
  */
-int pci_epc_set_bar(struct pci_epc *epc, enum pci_barno bar,
+int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, enum pci_barno bar,
 		    dma_addr_t bar_phys, size_t size, int flags)
 {
 	int ret;
 	unsigned long irq_flags;
 
-	if (IS_ERR(epc))
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return -EINVAL;
 
 	if (!epc->ops->set_bar)
 		return 0;
 
 	spin_lock_irqsave(&epc->lock, irq_flags);
-	ret = epc->ops->set_bar(epc, bar, bar_phys, size, flags);
+	ret = epc->ops->set_bar(epc, func_no, bar, bar_phys, size, flags);
 	spin_unlock_irqrestore(&epc->lock, irq_flags);
 
 	return ret;
@@ -333,6 +341,7 @@ EXPORT_SYMBOL_GPL(pci_epc_set_bar);
 /**
  * pci_epc_write_header() - write standard configuration header
  * @epc: the EPC device to which the configuration header should be written
+ * @func_no: the endpoint function number in the EPC device
  * @header: standard configuration header fields
  *
  * Invoke to write the configuration header to the endpoint controller. Every
@@ -340,19 +349,20 @@ EXPORT_SYMBOL_GPL(pci_epc_set_bar);
  * configuration header would be written. The callback function should write
  * the header fields to this dedicated location.
  */
-int pci_epc_write_header(struct pci_epc *epc, struct pci_epf_header *header)
+int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
+			 struct pci_epf_header *header)
 {
 	int ret;
 	unsigned long flags;
 
-	if (IS_ERR(epc))
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return -EINVAL;
 
 	if (!epc->ops->write_header)
 		return 0;
 
 	spin_lock_irqsave(&epc->lock, flags);
-	ret = epc->ops->write_header(epc, header);
+	ret = epc->ops->write_header(epc, func_no, header);
 	spin_unlock_irqrestore(&epc->lock, flags);
 
 	return ret;

drivers/pci/host/Makefile

@@ -34,6 +34,8 @@ obj-$(CONFIG_VMD) += vmd.o
 # ARM64 and use internal ifdefs to only build the pieces we need
 # depending on whether ACPI, the DT driver, or both are enabled.
 
+ifdef CONFIG_PCI
 obj-$(CONFIG_ARM64) += pci-thunder-ecam.o
 obj-$(CONFIG_ARM64) += pci-thunder-pem.o
 obj-$(CONFIG_ARM64) += pci-xgene.o
+endif

drivers/pci/host/pci-host-common.c

@@ -24,50 +24,6 @@
 #include <linux/pci-ecam.h>
 #include <linux/platform_device.h>
 
-static int gen_pci_parse_request_of_pci_ranges(struct device *dev,
-		       struct list_head *resources, struct resource **bus_range)
-{
-	int err, res_valid = 0;
-	struct device_node *np = dev->of_node;
-	resource_size_t iobase;
-	struct resource_entry *win, *tmp;
-
-	err = of_pci_get_host_bridge_resources(np, 0, 0xff, resources, &iobase);
-	if (err)
-		return err;
-
-	err = devm_request_pci_bus_resources(dev, resources);
-	if (err)
-		return err;
-
-	resource_list_for_each_entry_safe(win, tmp, resources) {
-		struct resource *res = win->res;
-
-		switch (resource_type(res)) {
-		case IORESOURCE_IO:
-			err = pci_remap_iospace(res, iobase);
-			if (err) {
-				dev_warn(dev, "error %d: failed to map resource %pR\n",
-					 err, res);
-				resource_list_destroy_entry(win);
-			}
-			break;
-		case IORESOURCE_MEM:
-			res_valid |= !(res->flags & IORESOURCE_PREFETCH);
-			break;
-		case IORESOURCE_BUS:
-			*bus_range = res;
-			break;
-		}
-	}
-
-	if (res_valid)
-		return 0;
-
-	dev_err(dev, "non-prefetchable memory resource required\n");
-	return -EINVAL;
-}
-
 static void gen_pci_unmap_cfg(void *ptr)
 {
 	pci_ecam_free((struct pci_config_window *)ptr);
@@ -82,9 +38,9 @@ static struct pci_config_window *gen_pci_init(struct device *dev,
 	struct pci_config_window *cfg;
 
 	/* Parse our PCI ranges and request their resources */
-	err = gen_pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
+	err = pci_parse_request_of_pci_ranges(dev, resources, &bus_range);
 	if (err)
-		goto err_out;
+		return ERR_PTR(err);
 
 	err = of_address_to_resource(dev->of_node, 0, &cfgres);
 	if (err) {
@@ -116,7 +72,6 @@ int pci_host_common_probe(struct platform_device *pdev,
 	const char *type;
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
-	struct pci_bus *bus, *child;
 	struct pci_host_bridge *bridge;
 	struct pci_config_window *cfg;
 	struct list_head resources;
@@ -135,7 +90,6 @@ int pci_host_common_probe(struct platform_device *pdev,
 	of_pci_check_probe_only();
 
 	/* Parse and map our Configuration Space windows */
-	INIT_LIST_HEAD(&resources);
 	cfg = gen_pci_init(dev, &resources, ops);
 	if (IS_ERR(cfg))
 		return PTR_ERR(cfg);
@@ -152,29 +106,11 @@ int pci_host_common_probe(struct platform_device *pdev,
 	bridge->map_irq = of_irq_parse_and_map_pci;
 	bridge->swizzle_irq = pci_common_swizzle;
 
-	ret = pci_scan_root_bus_bridge(bridge);
+	ret = pci_host_probe(bridge);
 	if (ret < 0) {
-		dev_err(dev, "Scanning root bridge failed");
+		pci_free_resource_list(&resources);
 		return ret;
 	}
 
-	bus = bridge->bus;
-
-	/*
-	 * We insert PCI resources into the iomem_resource and
-	 * ioport_resource trees in either pci_bus_claim_resources()
-	 * or pci_bus_assign_resources().
-	 */
-	if (pci_has_flag(PCI_PROBE_ONLY)) {
-		pci_bus_claim_resources(bus);
-	} else {
-		pci_bus_size_bridges(bus);
-		pci_bus_assign_resources(bus);
-
-		list_for_each_entry(child, &bus->children, node)
-			pcie_bus_configure_settings(child);
-	}
-
-	pci_bus_add_devices(bus);
 	return 0;
 }

drivers/pci/of.c

@@ -92,7 +92,6 @@ struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus)
 #endif
 }
 
-
 static inline int __of_pci_pci_compare(struct device_node *node,
 				       unsigned int data)
 {
@@ -598,3 +597,55 @@ int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin)
 }
 EXPORT_SYMBOL_GPL(of_irq_parse_and_map_pci);
 #endif	/* CONFIG_OF_IRQ */
+
+int pci_parse_request_of_pci_ranges(struct device *dev,
+				    struct list_head *resources,
+				    struct resource **bus_range)
+{
+	int err, res_valid = 0;
+	struct device_node *np = dev->of_node;
+	resource_size_t iobase;
+	struct resource_entry *win, *tmp;
+
+	INIT_LIST_HEAD(resources);
+	err = of_pci_get_host_bridge_resources(np, 0, 0xff, resources, &iobase);
+	if (err)
+		return err;
+
+	err = devm_request_pci_bus_resources(dev, resources);
+	if (err)
+		goto out_release_res;
+
+	resource_list_for_each_entry_safe(win, tmp, resources) {
+		struct resource *res = win->res;
+
+		switch (resource_type(res)) {
+		case IORESOURCE_IO:
+			err = pci_remap_iospace(res, iobase);
+			if (err) {
+				dev_warn(dev, "error %d: failed to map resource %pR\n",
+					 err, res);
+				resource_list_destroy_entry(win);
+			}
+			break;
+		case IORESOURCE_MEM:
+			res_valid |= !(res->flags & IORESOURCE_PREFETCH);
+			break;
+		case IORESOURCE_BUS:
+			if (bus_range)
+				*bus_range = res;
+			break;
+		}
+	}
+
+	if (res_valid)
+		return 0;
+
+	dev_err(dev, "non-prefetchable memory resource required\n");
+	err = -EINVAL;
+
+ out_release_res:
+	pci_free_resource_list(resources);
+	return err;
+}
+

drivers/pci/probe.c

@@ -2684,6 +2684,39 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 }
 EXPORT_SYMBOL_GPL(pci_create_root_bus);
 
+int pci_host_probe(struct pci_host_bridge *bridge)
+{
+	struct pci_bus *bus, *child;
+	int ret;
+
+	ret = pci_scan_root_bus_bridge(bridge);
+	if (ret < 0) {
+		dev_err(bridge->dev.parent, "Scanning root bridge failed");
+		return ret;
+	}
+
+	bus = bridge->bus;
+
+	/*
+	 * We insert PCI resources into the iomem_resource and
+	 * ioport_resource trees in either pci_bus_claim_resources()
+	 * or pci_bus_assign_resources().
+	 */
+	if (pci_has_flag(PCI_PROBE_ONLY)) {
+		pci_bus_claim_resources(bus);
+	} else {
+		pci_bus_size_bridges(bus);
+		pci_bus_assign_resources(bus);
+
+		list_for_each_entry(child, &bus->children, node)
+			pcie_bus_configure_settings(child);
+	}
+
+	pci_bus_add_devices(bus);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_host_probe);
+
 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
 {
 	struct resource *res = &b->busn_res;

include/linux/pci-epc.h

@@ -39,17 +39,20 @@ enum pci_epc_irq_type {
  * @owner: the module owner containing the ops
  */
 struct pci_epc_ops {
-	int	(*write_header)(struct pci_epc *pci_epc,
+	int	(*write_header)(struct pci_epc *epc, u8 func_no,
 				struct pci_epf_header *hdr);
-	int	(*set_bar)(struct pci_epc *epc, enum pci_barno bar,
+	int	(*set_bar)(struct pci_epc *epc, u8 func_no,
+			   enum pci_barno bar,
 			   dma_addr_t bar_phys, size_t size, int flags);
-	void	(*clear_bar)(struct pci_epc *epc, enum pci_barno bar);
-	int	(*map_addr)(struct pci_epc *epc, phys_addr_t addr,
-			    u64 pci_addr, size_t size);
-	void	(*unmap_addr)(struct pci_epc *epc, phys_addr_t addr);
-	int	(*set_msi)(struct pci_epc *epc, u8 interrupts);
-	int	(*get_msi)(struct pci_epc *epc);
-	int	(*raise_irq)(struct pci_epc *pci_epc,
+	void	(*clear_bar)(struct pci_epc *epc, u8 func_no,
+			     enum pci_barno bar);
+	int	(*map_addr)(struct pci_epc *epc, u8 func_no,
+			    phys_addr_t addr, u64 pci_addr, size_t size);
+	void	(*unmap_addr)(struct pci_epc *epc, u8 func_no,
+			      phys_addr_t addr);
+	int	(*set_msi)(struct pci_epc *epc, u8 func_no, u8 interrupts);
+	int	(*get_msi)(struct pci_epc *epc, u8 func_no);
+	int	(*raise_irq)(struct pci_epc *epc, u8 func_no,
 			     enum pci_epc_irq_type type, u8 interrupt_num);
 	int	(*start)(struct pci_epc *epc);
 	void	(*stop)(struct pci_epc *epc);
@@ -124,17 +127,21 @@ void pci_epc_destroy(struct pci_epc *epc);
 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf);
 void pci_epc_linkup(struct pci_epc *epc);
 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf);
-int pci_epc_write_header(struct pci_epc *epc, struct pci_epf_header *hdr);
-int pci_epc_set_bar(struct pci_epc *epc, enum pci_barno bar,
+int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
+			 struct pci_epf_header *hdr);
+int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
+		    enum pci_barno bar,
 		    dma_addr_t bar_phys, size_t size, int flags);
-void pci_epc_clear_bar(struct pci_epc *epc, int bar);
-int pci_epc_map_addr(struct pci_epc *epc, phys_addr_t phys_addr,
+void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, int bar);
+int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
+		     phys_addr_t phys_addr,
 		     u64 pci_addr, size_t size);
-void pci_epc_unmap_addr(struct pci_epc *epc, phys_addr_t phys_addr);
-int pci_epc_set_msi(struct pci_epc *epc, u8 interrupts);
-int pci_epc_get_msi(struct pci_epc *epc);
-int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type,
-		      u8 interrupt_num);
+void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
+			phys_addr_t phys_addr);
+int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts);
+int pci_epc_get_msi(struct pci_epc *epc, u8 func_no);
+int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
+		      enum pci_epc_irq_type type, u8 interrupt_num);
 int pci_epc_start(struct pci_epc *epc);
 void pci_epc_stop(struct pci_epc *epc);
 struct pci_epc *pci_epc_get(const char *epc_name);

include/linux/pci.h

@@ -879,6 +879,7 @@ struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 				    struct pci_ops *ops, void *sysdata,
 				    struct list_head *resources);
+int pci_host_probe(struct pci_host_bridge *bridge);
 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
 int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax);
 void pci_bus_release_busn_res(struct pci_bus *b);
@@ -2171,6 +2172,9 @@ void pci_release_of_node(struct pci_dev *dev);
 void pci_set_bus_of_node(struct pci_bus *bus);
 void pci_release_bus_of_node(struct pci_bus *bus);
 struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus);
+int pci_parse_request_of_pci_ranges(struct device *dev,
+				    struct list_head *resources,
+				    struct resource **bus_range);
 
 /* Arch may override this (weak) */
 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus);
@@ -2195,7 +2199,13 @@ static inline struct device_node *
 pci_device_to_OF_node(const struct pci_dev *pdev) { return NULL; }
 static inline struct irq_domain *
 pci_host_bridge_of_msi_domain(struct pci_bus *bus) { return NULL; }
-#endif	/* CONFIG_OF */
+static inline int pci_parse_request_of_pci_ranges(struct device *dev,
+						  struct list_head *resources,
+						  struct resource **bus_range)
+{
+	return -EINVAL;
+}
+#endif  /* CONFIG_OF */
 
 #ifdef CONFIG_ACPI
 struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus);

include/linux/pci_ids.h

@@ -2381,6 +2381,8 @@
 
 #define PCI_VENDOR_ID_LENOVO		0x17aa
 
+#define PCI_VENDOR_ID_CDNS		0x17cd
+
 #define PCI_VENDOR_ID_ARECA		0x17d3
 #define PCI_DEVICE_ID_ARECA_1110	0x1110
 #define PCI_DEVICE_ID_ARECA_1120	0x1120