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-rw-r--r--arch/powerpc/kernel/pci_dn.c558
1 files changed, 558 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
new file mode 100644
index 000000000..b173ba342
--- /dev/null
+++ b/arch/powerpc/kernel/pci_dn.c
@@ -0,0 +1,558 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * pci_dn.c
+ *
+ * Copyright (C) 2001 Todd Inglett, IBM Corporation
+ *
+ * PCI manipulation via device_nodes.
+ */
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/gfp.h>
+
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/pci-bridge.h>
+#include <asm/ppc-pci.h>
+#include <asm/firmware.h>
+#include <asm/eeh.h>
+
+/*
+ * The function is used to find the firmware data of one
+ * specific PCI device, which is attached to the indicated
+ * PCI bus. For VFs, their firmware data is linked to that
+ * one of PF's bridge. For other devices, their firmware
+ * data is linked to that of their bridge.
+ */
+static struct pci_dn *pci_bus_to_pdn(struct pci_bus *bus)
+{
+ struct pci_bus *pbus;
+ struct device_node *dn;
+ struct pci_dn *pdn;
+
+ /*
+ * We probably have virtual bus which doesn't
+ * have associated bridge.
+ */
+ pbus = bus;
+ while (pbus) {
+ if (pci_is_root_bus(pbus) || pbus->self)
+ break;
+
+ pbus = pbus->parent;
+ }
+
+ /*
+ * Except virtual bus, all PCI buses should
+ * have device nodes.
+ */
+ dn = pci_bus_to_OF_node(pbus);
+ pdn = dn ? PCI_DN(dn) : NULL;
+
+ return pdn;
+}
+
+struct pci_dn *pci_get_pdn_by_devfn(struct pci_bus *bus,
+ int devfn)
+{
+ struct device_node *dn = NULL;
+ struct pci_dn *parent, *pdn;
+ struct pci_dev *pdev = NULL;
+
+ /* Fast path: fetch from PCI device */
+ list_for_each_entry(pdev, &bus->devices, bus_list) {
+ if (pdev->devfn == devfn) {
+ if (pdev->dev.archdata.pci_data)
+ return pdev->dev.archdata.pci_data;
+
+ dn = pci_device_to_OF_node(pdev);
+ break;
+ }
+ }
+
+ /* Fast path: fetch from device node */
+ pdn = dn ? PCI_DN(dn) : NULL;
+ if (pdn)
+ return pdn;
+
+ /* Slow path: fetch from firmware data hierarchy */
+ parent = pci_bus_to_pdn(bus);
+ if (!parent)
+ return NULL;
+
+ list_for_each_entry(pdn, &parent->child_list, list) {
+ if (pdn->busno == bus->number &&
+ pdn->devfn == devfn)
+ return pdn;
+ }
+
+ return NULL;
+}
+
+struct pci_dn *pci_get_pdn(struct pci_dev *pdev)
+{
+ struct device_node *dn;
+ struct pci_dn *parent, *pdn;
+
+ /* Search device directly */
+ if (pdev->dev.archdata.pci_data)
+ return pdev->dev.archdata.pci_data;
+
+ /* Check device node */
+ dn = pci_device_to_OF_node(pdev);
+ pdn = dn ? PCI_DN(dn) : NULL;
+ if (pdn)
+ return pdn;
+
+ /*
+ * VFs don't have device nodes. We hook their
+ * firmware data to PF's bridge.
+ */
+ parent = pci_bus_to_pdn(pdev->bus);
+ if (!parent)
+ return NULL;
+
+ list_for_each_entry(pdn, &parent->child_list, list) {
+ if (pdn->busno == pdev->bus->number &&
+ pdn->devfn == pdev->devfn)
+ return pdn;
+ }
+
+ return NULL;
+}
+
+#ifdef CONFIG_EEH
+static struct eeh_dev *eeh_dev_init(struct pci_dn *pdn)
+{
+ struct eeh_dev *edev;
+
+ /* Allocate EEH device */
+ edev = kzalloc(sizeof(*edev), GFP_KERNEL);
+ if (!edev)
+ return NULL;
+
+ /* Associate EEH device with OF node */
+ pdn->edev = edev;
+ edev->pdn = pdn;
+ edev->bdfn = (pdn->busno << 8) | pdn->devfn;
+ edev->controller = pdn->phb;
+
+ return edev;
+}
+#endif /* CONFIG_EEH */
+
+#ifdef CONFIG_PCI_IOV
+static struct pci_dn *add_one_sriov_vf_pdn(struct pci_dn *parent,
+ int busno, int devfn)
+{
+ struct pci_dn *pdn;
+
+ /* Except PHB, we always have the parent */
+ if (!parent)
+ return NULL;
+
+ pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
+ if (!pdn)
+ return NULL;
+
+ pdn->phb = parent->phb;
+ pdn->parent = parent;
+ pdn->busno = busno;
+ pdn->devfn = devfn;
+ pdn->pe_number = IODA_INVALID_PE;
+ INIT_LIST_HEAD(&pdn->child_list);
+ INIT_LIST_HEAD(&pdn->list);
+ list_add_tail(&pdn->list, &parent->child_list);
+
+ return pdn;
+}
+
+struct pci_dn *add_sriov_vf_pdns(struct pci_dev *pdev)
+{
+ struct pci_dn *parent, *pdn;
+ int i;
+
+ /* Only support IOV for now */
+ if (WARN_ON(!pdev->is_physfn))
+ return NULL;
+
+ /* Check if VFs have been populated */
+ pdn = pci_get_pdn(pdev);
+ if (!pdn || (pdn->flags & PCI_DN_FLAG_IOV_VF))
+ return NULL;
+
+ pdn->flags |= PCI_DN_FLAG_IOV_VF;
+ parent = pci_bus_to_pdn(pdev->bus);
+ if (!parent)
+ return NULL;
+
+ for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
+ struct eeh_dev *edev __maybe_unused;
+
+ pdn = add_one_sriov_vf_pdn(parent,
+ pci_iov_virtfn_bus(pdev, i),
+ pci_iov_virtfn_devfn(pdev, i));
+ if (!pdn) {
+ dev_warn(&pdev->dev, "%s: Cannot create firmware data for VF#%d\n",
+ __func__, i);
+ return NULL;
+ }
+
+#ifdef CONFIG_EEH
+ /* Create the EEH device for the VF */
+ edev = eeh_dev_init(pdn);
+ BUG_ON(!edev);
+
+ /* FIXME: these should probably be populated by the EEH probe */
+ edev->physfn = pdev;
+ edev->vf_index = i;
+#endif /* CONFIG_EEH */
+ }
+ return pci_get_pdn(pdev);
+}
+
+void remove_sriov_vf_pdns(struct pci_dev *pdev)
+{
+ struct pci_dn *parent;
+ struct pci_dn *pdn, *tmp;
+ int i;
+
+ /* Only support IOV PF for now */
+ if (WARN_ON(!pdev->is_physfn))
+ return;
+
+ /* Check if VFs have been populated */
+ pdn = pci_get_pdn(pdev);
+ if (!pdn || !(pdn->flags & PCI_DN_FLAG_IOV_VF))
+ return;
+
+ pdn->flags &= ~PCI_DN_FLAG_IOV_VF;
+ parent = pci_bus_to_pdn(pdev->bus);
+ if (!parent)
+ return;
+
+ /*
+ * We might introduce flag to pci_dn in future
+ * so that we can release VF's firmware data in
+ * a batch mode.
+ */
+ for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
+ struct eeh_dev *edev __maybe_unused;
+
+ list_for_each_entry_safe(pdn, tmp,
+ &parent->child_list, list) {
+ if (pdn->busno != pci_iov_virtfn_bus(pdev, i) ||
+ pdn->devfn != pci_iov_virtfn_devfn(pdev, i))
+ continue;
+
+#ifdef CONFIG_EEH
+ /*
+ * Release EEH state for this VF. The PCI core
+ * has already torn down the pci_dev for this VF, but
+ * we're responsible to removing the eeh_dev since it
+ * has the same lifetime as the pci_dn that spawned it.
+ */
+ edev = pdn_to_eeh_dev(pdn);
+ if (edev) {
+ /*
+ * We allocate pci_dn's for the totalvfs count,
+ * but only only the vfs that were activated
+ * have a configured PE.
+ */
+ if (edev->pe)
+ eeh_pe_tree_remove(edev);
+
+ pdn->edev = NULL;
+ kfree(edev);
+ }
+#endif /* CONFIG_EEH */
+
+ if (!list_empty(&pdn->list))
+ list_del(&pdn->list);
+
+ kfree(pdn);
+ }
+ }
+}
+#endif /* CONFIG_PCI_IOV */
+
+struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
+ struct device_node *dn)
+{
+ const __be32 *type = of_get_property(dn, "ibm,pci-config-space-type", NULL);
+ const __be32 *regs;
+ struct device_node *parent;
+ struct pci_dn *pdn;
+#ifdef CONFIG_EEH
+ struct eeh_dev *edev;
+#endif
+
+ pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
+ if (pdn == NULL)
+ return NULL;
+ dn->data = pdn;
+ pdn->phb = hose;
+ pdn->pe_number = IODA_INVALID_PE;
+ regs = of_get_property(dn, "reg", NULL);
+ if (regs) {
+ u32 addr = of_read_number(regs, 1);
+
+ /* First register entry is addr (00BBSS00) */
+ pdn->busno = (addr >> 16) & 0xff;
+ pdn->devfn = (addr >> 8) & 0xff;
+ }
+
+ /* vendor/device IDs and class code */
+ regs = of_get_property(dn, "vendor-id", NULL);
+ pdn->vendor_id = regs ? of_read_number(regs, 1) : 0;
+ regs = of_get_property(dn, "device-id", NULL);
+ pdn->device_id = regs ? of_read_number(regs, 1) : 0;
+ regs = of_get_property(dn, "class-code", NULL);
+ pdn->class_code = regs ? of_read_number(regs, 1) : 0;
+
+ /* Extended config space */
+ pdn->pci_ext_config_space = (type && of_read_number(type, 1) == 1);
+
+ /* Create EEH device */
+#ifdef CONFIG_EEH
+ edev = eeh_dev_init(pdn);
+ if (!edev) {
+ kfree(pdn);
+ return NULL;
+ }
+#endif
+
+ /* Attach to parent node */
+ INIT_LIST_HEAD(&pdn->child_list);
+ INIT_LIST_HEAD(&pdn->list);
+ parent = of_get_parent(dn);
+ pdn->parent = parent ? PCI_DN(parent) : NULL;
+ of_node_put(parent);
+ if (pdn->parent)
+ list_add_tail(&pdn->list, &pdn->parent->child_list);
+
+ return pdn;
+}
+EXPORT_SYMBOL_GPL(pci_add_device_node_info);
+
+void pci_remove_device_node_info(struct device_node *dn)
+{
+ struct pci_dn *pdn = dn ? PCI_DN(dn) : NULL;
+ struct device_node *parent;
+ struct pci_dev *pdev;
+#ifdef CONFIG_EEH
+ struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
+
+ if (edev)
+ edev->pdn = NULL;
+#endif
+
+ if (!pdn)
+ return;
+
+ WARN_ON(!list_empty(&pdn->child_list));
+ list_del(&pdn->list);
+
+ /* Drop the parent pci_dn's ref to our backing dt node */
+ parent = of_get_parent(dn);
+ if (parent)
+ of_node_put(parent);
+
+ /*
+ * At this point we *might* still have a pci_dev that was
+ * instantiated from this pci_dn. So defer free()ing it until
+ * the pci_dev's release function is called.
+ */
+ pdev = pci_get_domain_bus_and_slot(pdn->phb->global_number,
+ pdn->busno, pdn->devfn);
+ if (pdev) {
+ /* NB: pdev has a ref to dn */
+ pci_dbg(pdev, "marked pdn (from %pOF) as dead\n", dn);
+ pdn->flags |= PCI_DN_FLAG_DEAD;
+ } else {
+ dn->data = NULL;
+ kfree(pdn);
+ }
+
+ pci_dev_put(pdev);
+}
+EXPORT_SYMBOL_GPL(pci_remove_device_node_info);
+
+/*
+ * Traverse a device tree stopping each PCI device in the tree.
+ * This is done depth first. As each node is processed, a "pre"
+ * function is called and the children are processed recursively.
+ *
+ * The "pre" func returns a value. If non-zero is returned from
+ * the "pre" func, the traversal stops and this value is returned.
+ * This return value is useful when using traverse as a method of
+ * finding a device.
+ *
+ * NOTE: we do not run the func for devices that do not appear to
+ * be PCI except for the start node which we assume (this is good
+ * because the start node is often a phb which may be missing PCI
+ * properties).
+ * We use the class-code as an indicator. If we run into
+ * one of these nodes we also assume its siblings are non-pci for
+ * performance.
+ */
+void *pci_traverse_device_nodes(struct device_node *start,
+ void *(*fn)(struct device_node *, void *),
+ void *data)
+{
+ struct device_node *dn, *nextdn;
+ void *ret;
+
+ /* We started with a phb, iterate all childs */
+ for (dn = start->child; dn; dn = nextdn) {
+ const __be32 *classp;
+ u32 class = 0;
+
+ nextdn = NULL;
+ classp = of_get_property(dn, "class-code", NULL);
+ if (classp)
+ class = of_read_number(classp, 1);
+
+ if (fn) {
+ ret = fn(dn, data);
+ if (ret)
+ return ret;
+ }
+
+ /* If we are a PCI bridge, go down */
+ if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI ||
+ (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
+ /* Depth first...do children */
+ nextdn = dn->child;
+ else if (dn->sibling)
+ /* ok, try next sibling instead. */
+ nextdn = dn->sibling;
+ if (!nextdn) {
+ /* Walk up to next valid sibling. */
+ do {
+ dn = dn->parent;
+ if (dn == start)
+ return NULL;
+ } while (dn->sibling == NULL);
+ nextdn = dn->sibling;
+ }
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(pci_traverse_device_nodes);
+
+static struct pci_dn *pci_dn_next_one(struct pci_dn *root,
+ struct pci_dn *pdn)
+{
+ struct list_head *next = pdn->child_list.next;
+
+ if (next != &pdn->child_list)
+ return list_entry(next, struct pci_dn, list);
+
+ while (1) {
+ if (pdn == root)
+ return NULL;
+
+ next = pdn->list.next;
+ if (next != &pdn->parent->child_list)
+ break;
+
+ pdn = pdn->parent;
+ }
+
+ return list_entry(next, struct pci_dn, list);
+}
+
+void *traverse_pci_dn(struct pci_dn *root,
+ void *(*fn)(struct pci_dn *, void *),
+ void *data)
+{
+ struct pci_dn *pdn = root;
+ void *ret;
+
+ /* Only scan the child nodes */
+ for (pdn = pci_dn_next_one(root, pdn); pdn;
+ pdn = pci_dn_next_one(root, pdn)) {
+ ret = fn(pdn, data);
+ if (ret)
+ return ret;
+ }
+
+ return NULL;
+}
+
+static void *add_pdn(struct device_node *dn, void *data)
+{
+ struct pci_controller *hose = data;
+ struct pci_dn *pdn;
+
+ pdn = pci_add_device_node_info(hose, dn);
+ if (!pdn)
+ return ERR_PTR(-ENOMEM);
+
+ return NULL;
+}
+
+/**
+ * pci_devs_phb_init_dynamic - setup pci devices under this PHB
+ * phb: pci-to-host bridge (top-level bridge connecting to cpu)
+ *
+ * This routine is called both during boot, (before the memory
+ * subsystem is set up, before kmalloc is valid) and during the
+ * dynamic lpar operation of adding a PHB to a running system.
+ */
+void pci_devs_phb_init_dynamic(struct pci_controller *phb)
+{
+ struct device_node *dn = phb->dn;
+ struct pci_dn *pdn;
+
+ /* PHB nodes themselves must not match */
+ pdn = pci_add_device_node_info(phb, dn);
+ if (pdn) {
+ pdn->devfn = pdn->busno = -1;
+ pdn->vendor_id = pdn->device_id = pdn->class_code = 0;
+ pdn->phb = phb;
+ phb->pci_data = pdn;
+ }
+
+ /* Update dn->phb ptrs for new phb and children devices */
+ pci_traverse_device_nodes(dn, add_pdn, phb);
+}
+
+/**
+ * pci_devs_phb_init - Initialize phbs and pci devs under them.
+ *
+ * This routine walks over all phb's (pci-host bridges) on the
+ * system, and sets up assorted pci-related structures
+ * (including pci info in the device node structs) for each
+ * pci device found underneath. This routine runs once,
+ * early in the boot sequence.
+ */
+static int __init pci_devs_phb_init(void)
+{
+ struct pci_controller *phb, *tmp;
+
+ /* This must be done first so the device nodes have valid pci info! */
+ list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
+ pci_devs_phb_init_dynamic(phb);
+
+ return 0;
+}
+
+core_initcall(pci_devs_phb_init);
+
+static void pci_dev_pdn_setup(struct pci_dev *pdev)
+{
+ struct pci_dn *pdn;
+
+ if (pdev->dev.archdata.pci_data)
+ return;
+
+ /* Setup the fast path */
+ pdn = pci_get_pdn(pdev);
+ pdev->dev.archdata.pci_data = pdn;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_dev_pdn_setup);
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