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Diffstat (limited to 'drivers/pci/host/pci-hyperv.c')
-rw-r--r--drivers/pci/host/pci-hyperv.c2694
1 files changed, 0 insertions, 2694 deletions
diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c
deleted file mode 100644
index 6cc5036ac83c..000000000000
--- a/drivers/pci/host/pci-hyperv.c
+++ /dev/null
@@ -1,2694 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) Microsoft Corporation.
- *
- * Author:
- * Jake Oshins <jakeo@microsoft.com>
- *
- * This driver acts as a paravirtual front-end for PCI Express root buses.
- * When a PCI Express function (either an entire device or an SR-IOV
- * Virtual Function) is being passed through to the VM, this driver exposes
- * a new bus to the guest VM. This is modeled as a root PCI bus because
- * no bridges are being exposed to the VM. In fact, with a "Generation 2"
- * VM within Hyper-V, there may seem to be no PCI bus at all in the VM
- * until a device as been exposed using this driver.
- *
- * Each root PCI bus has its own PCI domain, which is called "Segment" in
- * the PCI Firmware Specifications. Thus while each device passed through
- * to the VM using this front-end will appear at "device 0", the domain will
- * be unique. Typically, each bus will have one PCI function on it, though
- * this driver does support more than one.
- *
- * In order to map the interrupts from the device through to the guest VM,
- * this driver also implements an IRQ Domain, which handles interrupts (either
- * MSI or MSI-X) associated with the functions on the bus. As interrupts are
- * set up, torn down, or reaffined, this driver communicates with the
- * underlying hypervisor to adjust the mappings in the I/O MMU so that each
- * interrupt will be delivered to the correct virtual processor at the right
- * vector. This driver does not support level-triggered (line-based)
- * interrupts, and will report that the Interrupt Line register in the
- * function's configuration space is zero.
- *
- * The rest of this driver mostly maps PCI concepts onto underlying Hyper-V
- * facilities. For instance, the configuration space of a function exposed
- * by Hyper-V is mapped into a single page of memory space, and the
- * read and write handlers for config space must be aware of this mechanism.
- * Similarly, device setup and teardown involves messages sent to and from
- * the PCI back-end driver in Hyper-V.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/delay.h>
-#include <linux/semaphore.h>
-#include <linux/irqdomain.h>
-#include <asm/irqdomain.h>
-#include <asm/apic.h>
-#include <linux/msi.h>
-#include <linux/hyperv.h>
-#include <linux/refcount.h>
-#include <asm/mshyperv.h>
-
-/*
- * Protocol versions. The low word is the minor version, the high word the
- * major version.
- */
-
-#define PCI_MAKE_VERSION(major, minor) ((u32)(((major) << 16) | (minor)))
-#define PCI_MAJOR_VERSION(version) ((u32)(version) >> 16)
-#define PCI_MINOR_VERSION(version) ((u32)(version) & 0xff)
-
-enum pci_protocol_version_t {
- PCI_PROTOCOL_VERSION_1_1 = PCI_MAKE_VERSION(1, 1), /* Win10 */
- PCI_PROTOCOL_VERSION_1_2 = PCI_MAKE_VERSION(1, 2), /* RS1 */
-};
-
-#define CPU_AFFINITY_ALL -1ULL
-
-/*
- * Supported protocol versions in the order of probing - highest go
- * first.
- */
-static enum pci_protocol_version_t pci_protocol_versions[] = {
- PCI_PROTOCOL_VERSION_1_2,
- PCI_PROTOCOL_VERSION_1_1,
-};
-
-/*
- * Protocol version negotiated by hv_pci_protocol_negotiation().
- */
-static enum pci_protocol_version_t pci_protocol_version;
-
-#define PCI_CONFIG_MMIO_LENGTH 0x2000
-#define CFG_PAGE_OFFSET 0x1000
-#define CFG_PAGE_SIZE (PCI_CONFIG_MMIO_LENGTH - CFG_PAGE_OFFSET)
-
-#define MAX_SUPPORTED_MSI_MESSAGES 0x400
-
-#define STATUS_REVISION_MISMATCH 0xC0000059
-
-/*
- * Message Types
- */
-
-enum pci_message_type {
- /*
- * Version 1.1
- */
- PCI_MESSAGE_BASE = 0x42490000,
- PCI_BUS_RELATIONS = PCI_MESSAGE_BASE + 0,
- PCI_QUERY_BUS_RELATIONS = PCI_MESSAGE_BASE + 1,
- PCI_POWER_STATE_CHANGE = PCI_MESSAGE_BASE + 4,
- PCI_QUERY_RESOURCE_REQUIREMENTS = PCI_MESSAGE_BASE + 5,
- PCI_QUERY_RESOURCE_RESOURCES = PCI_MESSAGE_BASE + 6,
- PCI_BUS_D0ENTRY = PCI_MESSAGE_BASE + 7,
- PCI_BUS_D0EXIT = PCI_MESSAGE_BASE + 8,
- PCI_READ_BLOCK = PCI_MESSAGE_BASE + 9,
- PCI_WRITE_BLOCK = PCI_MESSAGE_BASE + 0xA,
- PCI_EJECT = PCI_MESSAGE_BASE + 0xB,
- PCI_QUERY_STOP = PCI_MESSAGE_BASE + 0xC,
- PCI_REENABLE = PCI_MESSAGE_BASE + 0xD,
- PCI_QUERY_STOP_FAILED = PCI_MESSAGE_BASE + 0xE,
- PCI_EJECTION_COMPLETE = PCI_MESSAGE_BASE + 0xF,
- PCI_RESOURCES_ASSIGNED = PCI_MESSAGE_BASE + 0x10,
- PCI_RESOURCES_RELEASED = PCI_MESSAGE_BASE + 0x11,
- PCI_INVALIDATE_BLOCK = PCI_MESSAGE_BASE + 0x12,
- PCI_QUERY_PROTOCOL_VERSION = PCI_MESSAGE_BASE + 0x13,
- PCI_CREATE_INTERRUPT_MESSAGE = PCI_MESSAGE_BASE + 0x14,
- PCI_DELETE_INTERRUPT_MESSAGE = PCI_MESSAGE_BASE + 0x15,
- PCI_RESOURCES_ASSIGNED2 = PCI_MESSAGE_BASE + 0x16,
- PCI_CREATE_INTERRUPT_MESSAGE2 = PCI_MESSAGE_BASE + 0x17,
- PCI_DELETE_INTERRUPT_MESSAGE2 = PCI_MESSAGE_BASE + 0x18, /* unused */
- PCI_MESSAGE_MAXIMUM
-};
-
-/*
- * Structures defining the virtual PCI Express protocol.
- */
-
-union pci_version {
- struct {
- u16 minor_version;
- u16 major_version;
- } parts;
- u32 version;
-} __packed;
-
-/*
- * Function numbers are 8-bits wide on Express, as interpreted through ARI,
- * which is all this driver does. This representation is the one used in
- * Windows, which is what is expected when sending this back and forth with
- * the Hyper-V parent partition.
- */
-union win_slot_encoding {
- struct {
- u32 dev:5;
- u32 func:3;
- u32 reserved:24;
- } bits;
- u32 slot;
-} __packed;
-
-/*
- * Pretty much as defined in the PCI Specifications.
- */
-struct pci_function_description {
- u16 v_id; /* vendor ID */
- u16 d_id; /* device ID */
- u8 rev;
- u8 prog_intf;
- u8 subclass;
- u8 base_class;
- u32 subsystem_id;
- union win_slot_encoding win_slot;
- u32 ser; /* serial number */
-} __packed;
-
-/**
- * struct hv_msi_desc
- * @vector: IDT entry
- * @delivery_mode: As defined in Intel's Programmer's
- * Reference Manual, Volume 3, Chapter 8.
- * @vector_count: Number of contiguous entries in the
- * Interrupt Descriptor Table that are
- * occupied by this Message-Signaled
- * Interrupt. For "MSI", as first defined
- * in PCI 2.2, this can be between 1 and
- * 32. For "MSI-X," as first defined in PCI
- * 3.0, this must be 1, as each MSI-X table
- * entry would have its own descriptor.
- * @reserved: Empty space
- * @cpu_mask: All the target virtual processors.
- */
-struct hv_msi_desc {
- u8 vector;
- u8 delivery_mode;
- u16 vector_count;
- u32 reserved;
- u64 cpu_mask;
-} __packed;
-
-/**
- * struct hv_msi_desc2 - 1.2 version of hv_msi_desc
- * @vector: IDT entry
- * @delivery_mode: As defined in Intel's Programmer's
- * Reference Manual, Volume 3, Chapter 8.
- * @vector_count: Number of contiguous entries in the
- * Interrupt Descriptor Table that are
- * occupied by this Message-Signaled
- * Interrupt. For "MSI", as first defined
- * in PCI 2.2, this can be between 1 and
- * 32. For "MSI-X," as first defined in PCI
- * 3.0, this must be 1, as each MSI-X table
- * entry would have its own descriptor.
- * @processor_count: number of bits enabled in array.
- * @processor_array: All the target virtual processors.
- */
-struct hv_msi_desc2 {
- u8 vector;
- u8 delivery_mode;
- u16 vector_count;
- u16 processor_count;
- u16 processor_array[32];
-} __packed;
-
-/**
- * struct tran_int_desc
- * @reserved: unused, padding
- * @vector_count: same as in hv_msi_desc
- * @data: This is the "data payload" value that is
- * written by the device when it generates
- * a message-signaled interrupt, either MSI
- * or MSI-X.
- * @address: This is the address to which the data
- * payload is written on interrupt
- * generation.
- */
-struct tran_int_desc {
- u16 reserved;
- u16 vector_count;
- u32 data;
- u64 address;
-} __packed;
-
-/*
- * A generic message format for virtual PCI.
- * Specific message formats are defined later in the file.
- */
-
-struct pci_message {
- u32 type;
-} __packed;
-
-struct pci_child_message {
- struct pci_message message_type;
- union win_slot_encoding wslot;
-} __packed;
-
-struct pci_incoming_message {
- struct vmpacket_descriptor hdr;
- struct pci_message message_type;
-} __packed;
-
-struct pci_response {
- struct vmpacket_descriptor hdr;
- s32 status; /* negative values are failures */
-} __packed;
-
-struct pci_packet {
- void (*completion_func)(void *context, struct pci_response *resp,
- int resp_packet_size);
- void *compl_ctxt;
-
- struct pci_message message[0];
-};
-
-/*
- * Specific message types supporting the PCI protocol.
- */
-
-/*
- * Version negotiation message. Sent from the guest to the host.
- * The guest is free to try different versions until the host
- * accepts the version.
- *
- * pci_version: The protocol version requested.
- * is_last_attempt: If TRUE, this is the last version guest will request.
- * reservedz: Reserved field, set to zero.
- */
-
-struct pci_version_request {
- struct pci_message message_type;
- u32 protocol_version;
-} __packed;
-
-/*
- * Bus D0 Entry. This is sent from the guest to the host when the virtual
- * bus (PCI Express port) is ready for action.
- */
-
-struct pci_bus_d0_entry {
- struct pci_message message_type;
- u32 reserved;
- u64 mmio_base;
-} __packed;
-
-struct pci_bus_relations {
- struct pci_incoming_message incoming;
- u32 device_count;
- struct pci_function_description func[0];
-} __packed;
-
-struct pci_q_res_req_response {
- struct vmpacket_descriptor hdr;
- s32 status; /* negative values are failures */
- u32 probed_bar[6];
-} __packed;
-
-struct pci_set_power {
- struct pci_message message_type;
- union win_slot_encoding wslot;
- u32 power_state; /* In Windows terms */
- u32 reserved;
-} __packed;
-
-struct pci_set_power_response {
- struct vmpacket_descriptor hdr;
- s32 status; /* negative values are failures */
- union win_slot_encoding wslot;
- u32 resultant_state; /* In Windows terms */
- u32 reserved;
-} __packed;
-
-struct pci_resources_assigned {
- struct pci_message message_type;
- union win_slot_encoding wslot;
- u8 memory_range[0x14][6]; /* not used here */
- u32 msi_descriptors;
- u32 reserved[4];
-} __packed;
-
-struct pci_resources_assigned2 {
- struct pci_message message_type;
- union win_slot_encoding wslot;
- u8 memory_range[0x14][6]; /* not used here */
- u32 msi_descriptor_count;
- u8 reserved[70];
-} __packed;
-
-struct pci_create_interrupt {
- struct pci_message message_type;
- union win_slot_encoding wslot;
- struct hv_msi_desc int_desc;
-} __packed;
-
-struct pci_create_int_response {
- struct pci_response response;
- u32 reserved;
- struct tran_int_desc int_desc;
-} __packed;
-
-struct pci_create_interrupt2 {
- struct pci_message message_type;
- union win_slot_encoding wslot;
- struct hv_msi_desc2 int_desc;
-} __packed;
-
-struct pci_delete_interrupt {
- struct pci_message message_type;
- union win_slot_encoding wslot;
- struct tran_int_desc int_desc;
-} __packed;
-
-struct pci_dev_incoming {
- struct pci_incoming_message incoming;
- union win_slot_encoding wslot;
-} __packed;
-
-struct pci_eject_response {
- struct pci_message message_type;
- union win_slot_encoding wslot;
- u32 status;
-} __packed;
-
-static int pci_ring_size = (4 * PAGE_SIZE);
-
-/*
- * Definitions or interrupt steering hypercall.
- */
-#define HV_PARTITION_ID_SELF ((u64)-1)
-#define HVCALL_RETARGET_INTERRUPT 0x7e
-
-struct hv_interrupt_entry {
- u32 source; /* 1 for MSI(-X) */
- u32 reserved1;
- u32 address;
- u32 data;
-};
-
-#define HV_VP_SET_BANK_COUNT_MAX 5 /* current implementation limit */
-
-struct hv_vp_set {
- u64 format; /* 0 (HvGenericSetSparse4k) */
- u64 valid_banks;
- u64 masks[HV_VP_SET_BANK_COUNT_MAX];
-};
-
-/*
- * flags for hv_device_interrupt_target.flags
- */
-#define HV_DEVICE_INTERRUPT_TARGET_MULTICAST 1
-#define HV_DEVICE_INTERRUPT_TARGET_PROCESSOR_SET 2
-
-struct hv_device_interrupt_target {
- u32 vector;
- u32 flags;
- union {
- u64 vp_mask;
- struct hv_vp_set vp_set;
- };
-};
-
-struct retarget_msi_interrupt {
- u64 partition_id; /* use "self" */
- u64 device_id;
- struct hv_interrupt_entry int_entry;
- u64 reserved2;
- struct hv_device_interrupt_target int_target;
-} __packed;
-
-/*
- * Driver specific state.
- */
-
-enum hv_pcibus_state {
- hv_pcibus_init = 0,
- hv_pcibus_probed,
- hv_pcibus_installed,
- hv_pcibus_removed,
- hv_pcibus_maximum
-};
-
-struct hv_pcibus_device {
- struct pci_sysdata sysdata;
- enum hv_pcibus_state state;
- refcount_t remove_lock;
- struct hv_device *hdev;
- resource_size_t low_mmio_space;
- resource_size_t high_mmio_space;
- struct resource *mem_config;
- struct resource *low_mmio_res;
- struct resource *high_mmio_res;
- struct completion *survey_event;
- struct completion remove_event;
- struct pci_bus *pci_bus;
- spinlock_t config_lock; /* Avoid two threads writing index page */
- spinlock_t device_list_lock; /* Protect lists below */
- void __iomem *cfg_addr;
-
- struct list_head resources_for_children;
-
- struct list_head children;
- struct list_head dr_list;
-
- struct msi_domain_info msi_info;
- struct msi_controller msi_chip;
- struct irq_domain *irq_domain;
-
- /* hypercall arg, must not cross page boundary */
- struct retarget_msi_interrupt retarget_msi_interrupt_params;
-
- spinlock_t retarget_msi_interrupt_lock;
-
- struct workqueue_struct *wq;
-};
-
-/*
- * Tracks "Device Relations" messages from the host, which must be both
- * processed in order and deferred so that they don't run in the context
- * of the incoming packet callback.
- */
-struct hv_dr_work {
- struct work_struct wrk;
- struct hv_pcibus_device *bus;
-};
-
-struct hv_dr_state {
- struct list_head list_entry;
- u32 device_count;
- struct pci_function_description func[0];
-};
-
-enum hv_pcichild_state {
- hv_pcichild_init = 0,
- hv_pcichild_requirements,
- hv_pcichild_resourced,
- hv_pcichild_ejecting,
- hv_pcichild_maximum
-};
-
-struct hv_pci_dev {
- /* List protected by pci_rescan_remove_lock */
- struct list_head list_entry;
- refcount_t refs;
- enum hv_pcichild_state state;
- struct pci_function_description desc;
- bool reported_missing;
- struct hv_pcibus_device *hbus;
- struct work_struct wrk;
-
- /*
- * What would be observed if one wrote 0xFFFFFFFF to a BAR and then
- * read it back, for each of the BAR offsets within config space.
- */
- u32 probed_bar[6];
-};
-
-struct hv_pci_compl {
- struct completion host_event;
- s32 completion_status;
-};
-
-static void hv_pci_onchannelcallback(void *context);
-
-/**
- * hv_pci_generic_compl() - Invoked for a completion packet
- * @context: Set up by the sender of the packet.
- * @resp: The response packet
- * @resp_packet_size: Size in bytes of the packet
- *
- * This function is used to trigger an event and report status
- * for any message for which the completion packet contains a
- * status and nothing else.
- */
-static void hv_pci_generic_compl(void *context, struct pci_response *resp,
- int resp_packet_size)
-{
- struct hv_pci_compl *comp_pkt = context;
-
- if (resp_packet_size >= offsetofend(struct pci_response, status))
- comp_pkt->completion_status = resp->status;
- else
- comp_pkt->completion_status = -1;
-
- complete(&comp_pkt->host_event);
-}
-
-static struct hv_pci_dev *get_pcichild_wslot(struct hv_pcibus_device *hbus,
- u32 wslot);
-
-static void get_pcichild(struct hv_pci_dev *hpdev)
-{
- refcount_inc(&hpdev->refs);
-}
-
-static void put_pcichild(struct hv_pci_dev *hpdev)
-{
- if (refcount_dec_and_test(&hpdev->refs))
- kfree(hpdev);
-}
-
-static void get_hvpcibus(struct hv_pcibus_device *hv_pcibus);
-static void put_hvpcibus(struct hv_pcibus_device *hv_pcibus);
-
-/*
- * There is no good way to get notified from vmbus_onoffer_rescind(),
- * so let's use polling here, since this is not a hot path.
- */
-static int wait_for_response(struct hv_device *hdev,
- struct completion *comp)
-{
- while (true) {
- if (hdev->channel->rescind) {
- dev_warn_once(&hdev->device, "The device is gone.\n");
- return -ENODEV;
- }
-
- if (wait_for_completion_timeout(comp, HZ / 10))
- break;
- }
-
- return 0;
-}
-
-/**
- * devfn_to_wslot() - Convert from Linux PCI slot to Windows
- * @devfn: The Linux representation of PCI slot
- *
- * Windows uses a slightly different representation of PCI slot.
- *
- * Return: The Windows representation
- */
-static u32 devfn_to_wslot(int devfn)
-{
- union win_slot_encoding wslot;
-
- wslot.slot = 0;
- wslot.bits.dev = PCI_SLOT(devfn);
- wslot.bits.func = PCI_FUNC(devfn);
-
- return wslot.slot;
-}
-
-/**
- * wslot_to_devfn() - Convert from Windows PCI slot to Linux
- * @wslot: The Windows representation of PCI slot
- *
- * Windows uses a slightly different representation of PCI slot.
- *
- * Return: The Linux representation
- */
-static int wslot_to_devfn(u32 wslot)
-{
- union win_slot_encoding slot_no;
-
- slot_no.slot = wslot;
- return PCI_DEVFN(slot_no.bits.dev, slot_no.bits.func);
-}
-
-/*
- * PCI Configuration Space for these root PCI buses is implemented as a pair
- * of pages in memory-mapped I/O space. Writing to the first page chooses
- * the PCI function being written or read. Once the first page has been
- * written to, the following page maps in the entire configuration space of
- * the function.
- */
-
-/**
- * _hv_pcifront_read_config() - Internal PCI config read
- * @hpdev: The PCI driver's representation of the device
- * @where: Offset within config space
- * @size: Size of the transfer
- * @val: Pointer to the buffer receiving the data
- */
-static void _hv_pcifront_read_config(struct hv_pci_dev *hpdev, int where,
- int size, u32 *val)
-{
- unsigned long flags;
- void __iomem *addr = hpdev->hbus->cfg_addr + CFG_PAGE_OFFSET + where;
-
- /*
- * If the attempt is to read the IDs or the ROM BAR, simulate that.
- */
- if (where + size <= PCI_COMMAND) {
- memcpy(val, ((u8 *)&hpdev->desc.v_id) + where, size);
- } else if (where >= PCI_CLASS_REVISION && where + size <=
- PCI_CACHE_LINE_SIZE) {
- memcpy(val, ((u8 *)&hpdev->desc.rev) + where -
- PCI_CLASS_REVISION, size);
- } else if (where >= PCI_SUBSYSTEM_VENDOR_ID && where + size <=
- PCI_ROM_ADDRESS) {
- memcpy(val, (u8 *)&hpdev->desc.subsystem_id + where -
- PCI_SUBSYSTEM_VENDOR_ID, size);
- } else if (where >= PCI_ROM_ADDRESS && where + size <=
- PCI_CAPABILITY_LIST) {
- /* ROM BARs are unimplemented */
- *val = 0;
- } else if (where >= PCI_INTERRUPT_LINE && where + size <=
- PCI_INTERRUPT_PIN) {
- /*
- * Interrupt Line and Interrupt PIN are hard-wired to zero
- * because this front-end only supports message-signaled
- * interrupts.
- */
- *val = 0;
- } else if (where + size <= CFG_PAGE_SIZE) {
- spin_lock_irqsave(&hpdev->hbus->config_lock, flags);
- /* Choose the function to be read. (See comment above) */
- writel(hpdev->desc.win_slot.slot, hpdev->hbus->cfg_addr);
- /* Make sure the function was chosen before we start reading. */
- mb();
- /* Read from that function's config space. */
- switch (size) {
- case 1:
- *val = readb(addr);
- break;
- case 2:
- *val = readw(addr);
- break;
- default:
- *val = readl(addr);
- break;
- }
- /*
- * Make sure the read was done before we release the spinlock
- * allowing consecutive reads/writes.
- */
- mb();
- spin_unlock_irqrestore(&hpdev->hbus->config_lock, flags);
- } else {
- dev_err(&hpdev->hbus->hdev->device,
- "Attempt to read beyond a function's config space.\n");
- }
-}
-
-static u16 hv_pcifront_get_vendor_id(struct hv_pci_dev *hpdev)
-{
- u16 ret;
- unsigned long flags;
- void __iomem *addr = hpdev->hbus->cfg_addr + CFG_PAGE_OFFSET +
- PCI_VENDOR_ID;
-
- spin_lock_irqsave(&hpdev->hbus->config_lock, flags);
-
- /* Choose the function to be read. (See comment above) */
- writel(hpdev->desc.win_slot.slot, hpdev->hbus->cfg_addr);
- /* Make sure the function was chosen before we start reading. */
- mb();
- /* Read from that function's config space. */
- ret = readw(addr);
- /*
- * mb() is not required here, because the spin_unlock_irqrestore()
- * is a barrier.
- */
-
- spin_unlock_irqrestore(&hpdev->hbus->config_lock, flags);
-
- return ret;
-}
-
-/**
- * _hv_pcifront_write_config() - Internal PCI config write
- * @hpdev: The PCI driver's representation of the device
- * @where: Offset within config space
- * @size: Size of the transfer
- * @val: The data being transferred
- */
-static void _hv_pcifront_write_config(struct hv_pci_dev *hpdev, int where,
- int size, u32 val)
-{
- unsigned long flags;
- void __iomem *addr = hpdev->hbus->cfg_addr + CFG_PAGE_OFFSET + where;
-
- if (where >= PCI_SUBSYSTEM_VENDOR_ID &&
- where + size <= PCI_CAPABILITY_LIST) {
- /* SSIDs and ROM BARs are read-only */
- } else if (where >= PCI_COMMAND && where + size <= CFG_PAGE_SIZE) {
- spin_lock_irqsave(&hpdev->hbus->config_lock, flags);
- /* Choose the function to be written. (See comment above) */
- writel(hpdev->desc.win_slot.slot, hpdev->hbus->cfg_addr);
- /* Make sure the function was chosen before we start writing. */
- wmb();
- /* Write to that function's config space. */
- switch (size) {
- case 1:
- writeb(val, addr);
- break;
- case 2:
- writew(val, addr);
- break;
- default:
- writel(val, addr);
- break;
- }
- /*
- * Make sure the write was done before we release the spinlock
- * allowing consecutive reads/writes.
- */
- mb();
- spin_unlock_irqrestore(&hpdev->hbus->config_lock, flags);
- } else {
- dev_err(&hpdev->hbus->hdev->device,
- "Attempt to write beyond a function's config space.\n");
- }
-}
-
-/**
- * hv_pcifront_read_config() - Read configuration space
- * @bus: PCI Bus structure
- * @devfn: Device/function
- * @where: Offset from base
- * @size: Byte/word/dword
- * @val: Value to be read
- *
- * Return: PCIBIOS_SUCCESSFUL on success
- * PCIBIOS_DEVICE_NOT_FOUND on failure
- */
-static int hv_pcifront_read_config(struct pci_bus *bus, unsigned int devfn,
- int where, int size, u32 *val)
-{
- struct hv_pcibus_device *hbus =
- container_of(bus->sysdata, struct hv_pcibus_device, sysdata);
- struct hv_pci_dev *hpdev;
-
- hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(devfn));
- if (!hpdev)
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- _hv_pcifront_read_config(hpdev, where, size, val);
-
- put_pcichild(hpdev);
- return PCIBIOS_SUCCESSFUL;
-}
-
-/**
- * hv_pcifront_write_config() - Write configuration space
- * @bus: PCI Bus structure
- * @devfn: Device/function
- * @where: Offset from base
- * @size: Byte/word/dword
- * @val: Value to be written to device
- *
- * Return: PCIBIOS_SUCCESSFUL on success
- * PCIBIOS_DEVICE_NOT_FOUND on failure
- */
-static int hv_pcifront_write_config(struct pci_bus *bus, unsigned int devfn,
- int where, int size, u32 val)
-{
- struct hv_pcibus_device *hbus =
- container_of(bus->sysdata, struct hv_pcibus_device, sysdata);
- struct hv_pci_dev *hpdev;
-
- hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(devfn));
- if (!hpdev)
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- _hv_pcifront_write_config(hpdev, where, size, val);
-
- put_pcichild(hpdev);
- return PCIBIOS_SUCCESSFUL;
-}
-
-/* PCIe operations */
-static struct pci_ops hv_pcifront_ops = {
- .read = hv_pcifront_read_config,
- .write = hv_pcifront_write_config,
-};
-
-/* Interrupt management hooks */
-static void hv_int_desc_free(struct hv_pci_dev *hpdev,
- struct tran_int_desc *int_desc)
-{
- struct pci_delete_interrupt *int_pkt;
- struct {
- struct pci_packet pkt;
- u8 buffer[sizeof(struct pci_delete_interrupt)];
- } ctxt;
-
- memset(&ctxt, 0, sizeof(ctxt));
- int_pkt = (struct pci_delete_interrupt *)&ctxt.pkt.message;
- int_pkt->message_type.type =
- PCI_DELETE_INTERRUPT_MESSAGE;
- int_pkt->wslot.slot = hpdev->desc.win_slot.slot;
- int_pkt->int_desc = *int_desc;
- vmbus_sendpacket(hpdev->hbus->hdev->channel, int_pkt, sizeof(*int_pkt),
- (unsigned long)&ctxt.pkt, VM_PKT_DATA_INBAND, 0);
- kfree(int_desc);
-}
-
-/**
- * hv_msi_free() - Free the MSI.
- * @domain: The interrupt domain pointer
- * @info: Extra MSI-related context
- * @irq: Identifies the IRQ.
- *
- * The Hyper-V parent partition and hypervisor are tracking the
- * messages that are in use, keeping the interrupt redirection
- * table up to date. This callback sends a message that frees
- * the IRT entry and related tracking nonsense.
- */
-static void hv_msi_free(struct irq_domain *domain, struct msi_domain_info *info,
- unsigned int irq)
-{
- struct hv_pcibus_device *hbus;
- struct hv_pci_dev *hpdev;
- struct pci_dev *pdev;
- struct tran_int_desc *int_desc;
- struct irq_data *irq_data = irq_domain_get_irq_data(domain, irq);
- struct msi_desc *msi = irq_data_get_msi_desc(irq_data);
-
- pdev = msi_desc_to_pci_dev(msi);
- hbus = info->data;
- int_desc = irq_data_get_irq_chip_data(irq_data);
- if (!int_desc)
- return;
-
- irq_data->chip_data = NULL;
- hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(pdev->devfn));
- if (!hpdev) {
- kfree(int_desc);
- return;
- }
-
- hv_int_desc_free(hpdev, int_desc);
- put_pcichild(hpdev);
-}
-
-static int hv_set_affinity(struct irq_data *data, const struct cpumask *dest,
- bool force)
-{
- struct irq_data *parent = data->parent_data;
-
- return parent->chip->irq_set_affinity(parent, dest, force);
-}
-
-static void hv_irq_mask(struct irq_data *data)
-{
- pci_msi_mask_irq(data);
-}
-
-/**
- * hv_irq_unmask() - "Unmask" the IRQ by setting its current
- * affinity.
- * @data: Describes the IRQ
- *
- * Build new a destination for the MSI and make a hypercall to
- * update the Interrupt Redirection Table. "Device Logical ID"
- * is built out of this PCI bus's instance GUID and the function
- * number of the device.
- */
-static void hv_irq_unmask(struct irq_data *data)
-{
- struct msi_desc *msi_desc = irq_data_get_msi_desc(data);
- struct irq_cfg *cfg = irqd_cfg(data);
- struct retarget_msi_interrupt *params;
- struct hv_pcibus_device *hbus;
- struct cpumask *dest;
- struct pci_bus *pbus;
- struct pci_dev *pdev;
- unsigned long flags;
- u32 var_size = 0;
- int cpu_vmbus;
- int cpu;
- u64 res;
-
- dest = irq_data_get_effective_affinity_mask(data);
- pdev = msi_desc_to_pci_dev(msi_desc);
- pbus = pdev->bus;
- hbus = container_of(pbus->sysdata, struct hv_pcibus_device, sysdata);
-
- spin_lock_irqsave(&hbus->retarget_msi_interrupt_lock, flags);
-
- params = &hbus->retarget_msi_interrupt_params;
- memset(params, 0, sizeof(*params));
- params->partition_id = HV_PARTITION_ID_SELF;
- params->int_entry.source = 1; /* MSI(-X) */
- params->int_entry.address = msi_desc->msg.address_lo;
- params->int_entry.data = msi_desc->msg.data;
- params->device_id = (hbus->hdev->dev_instance.b[5] << 24) |
- (hbus->hdev->dev_instance.b[4] << 16) |
- (hbus->hdev->dev_instance.b[7] << 8) |
- (hbus->hdev->dev_instance.b[6] & 0xf8) |
- PCI_FUNC(pdev->devfn);
- params->int_target.vector = cfg->vector;
-
- /*
- * Honoring apic->irq_delivery_mode set to dest_Fixed by
- * setting the HV_DEVICE_INTERRUPT_TARGET_MULTICAST flag results in a
- * spurious interrupt storm. Not doing so does not seem to have a
- * negative effect (yet?).
- */
-
- if (pci_protocol_version >= PCI_PROTOCOL_VERSION_1_2) {
- /*
- * PCI_PROTOCOL_VERSION_1_2 supports the VP_SET version of the
- * HVCALL_RETARGET_INTERRUPT hypercall, which also coincides
- * with >64 VP support.
- * ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED
- * is not sufficient for this hypercall.
- */
- params->int_target.flags |=
- HV_DEVICE_INTERRUPT_TARGET_PROCESSOR_SET;
- params->int_target.vp_set.valid_banks =
- (1ull << HV_VP_SET_BANK_COUNT_MAX) - 1;
-
- /*
- * var-sized hypercall, var-size starts after vp_mask (thus
- * vp_set.format does not count, but vp_set.valid_banks does).
- */
- var_size = 1 + HV_VP_SET_BANK_COUNT_MAX;
-
- for_each_cpu_and(cpu, dest, cpu_online_mask) {
- cpu_vmbus = hv_cpu_number_to_vp_number(cpu);
-
- if (cpu_vmbus >= HV_VP_SET_BANK_COUNT_MAX * 64) {
- dev_err(&hbus->hdev->device,
- "too high CPU %d", cpu_vmbus);
- res = 1;
- goto exit_unlock;
- }
-
- params->int_target.vp_set.masks[cpu_vmbus / 64] |=
- (1ULL << (cpu_vmbus & 63));
- }
- } else {
- for_each_cpu_and(cpu, dest, cpu_online_mask) {
- params->int_target.vp_mask |=
- (1ULL << hv_cpu_number_to_vp_number(cpu));
- }
- }
-
- res = hv_do_hypercall(HVCALL_RETARGET_INTERRUPT | (var_size << 17),
- params, NULL);
-
-exit_unlock:
- spin_unlock_irqrestore(&hbus->retarget_msi_interrupt_lock, flags);
-
- if (res) {
- dev_err(&hbus->hdev->device,
- "%s() failed: %#llx", __func__, res);
- return;
- }
-
- pci_msi_unmask_irq(data);
-}
-
-struct compose_comp_ctxt {
- struct hv_pci_compl comp_pkt;
- struct tran_int_desc int_desc;
-};
-
-static void hv_pci_compose_compl(void *context, struct pci_response *resp,
- int resp_packet_size)
-{
- struct compose_comp_ctxt *comp_pkt = context;
- struct pci_create_int_response *int_resp =
- (struct pci_create_int_response *)resp;
-
- comp_pkt->comp_pkt.completion_status = resp->status;
- comp_pkt->int_desc = int_resp->int_desc;
- complete(&comp_pkt->comp_pkt.host_event);
-}
-
-static u32 hv_compose_msi_req_v1(
- struct pci_create_interrupt *int_pkt, struct cpumask *affinity,
- u32 slot, u8 vector)
-{
- int_pkt->message_type.type = PCI_CREATE_INTERRUPT_MESSAGE;
- int_pkt->wslot.slot = slot;
- int_pkt->int_desc.vector = vector;
- int_pkt->int_desc.vector_count = 1;
- int_pkt->int_desc.delivery_mode = dest_Fixed;
-
- /*
- * Create MSI w/ dummy vCPU set, overwritten by subsequent retarget in
- * hv_irq_unmask().
- */
- int_pkt->int_desc.cpu_mask = CPU_AFFINITY_ALL;
-
- return sizeof(*int_pkt);
-}
-
-static u32 hv_compose_msi_req_v2(
- struct pci_create_interrupt2 *int_pkt, struct cpumask *affinity,
- u32 slot, u8 vector)
-{
- int cpu;
-
- int_pkt->message_type.type = PCI_CREATE_INTERRUPT_MESSAGE2;
- int_pkt->wslot.slot = slot;
- int_pkt->int_desc.vector = vector;
- int_pkt->int_desc.vector_count = 1;
- int_pkt->int_desc.delivery_mode = dest_Fixed;
-
- /*
- * Create MSI w/ dummy vCPU set targeting just one vCPU, overwritten
- * by subsequent retarget in hv_irq_unmask().
- */
- cpu = cpumask_first_and(affinity, cpu_online_mask);
- int_pkt->int_desc.processor_array[0] =
- hv_cpu_number_to_vp_number(cpu);
- int_pkt->int_desc.processor_count = 1;
-
- return sizeof(*int_pkt);
-}
-
-/**
- * hv_compose_msi_msg() - Supplies a valid MSI address/data
- * @data: Everything about this MSI
- * @msg: Buffer that is filled in by this function
- *
- * This function unpacks the IRQ looking for target CPU set, IDT
- * vector and mode and sends a message to the parent partition
- * asking for a mapping for that tuple in this partition. The
- * response supplies a data value and address to which that data
- * should be written to trigger that interrupt.
- */
-static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
-{
- struct irq_cfg *cfg = irqd_cfg(data);
- struct hv_pcibus_device *hbus;
- struct hv_pci_dev *hpdev;
- struct pci_bus *pbus;
- struct pci_dev *pdev;
- struct cpumask *dest;
- struct compose_comp_ctxt comp;
- struct tran_int_desc *int_desc;
- struct {
- struct pci_packet pci_pkt;
- union {
- struct pci_create_interrupt v1;
- struct pci_create_interrupt2 v2;
- } int_pkts;
- } __packed ctxt;
-
- u32 size;
- int ret;
-
- pdev = msi_desc_to_pci_dev(irq_data_get_msi_desc(data));
- dest = irq_data_get_effective_affinity_mask(data);
- pbus = pdev->bus;
- hbus = container_of(pbus->sysdata, struct hv_pcibus_device, sysdata);
- hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(pdev->devfn));
- if (!hpdev)
- goto return_null_message;
-
- /* Free any previous message that might have already been composed. */
- if (data->chip_data) {
- int_desc = data->chip_data;
- data->chip_data = NULL;
- hv_int_desc_free(hpdev, int_desc);
- }
-
- int_desc = kzalloc(sizeof(*int_desc), GFP_ATOMIC);
- if (!int_desc)
- goto drop_reference;
-
- memset(&ctxt, 0, sizeof(ctxt));
- init_completion(&comp.comp_pkt.host_event);
- ctxt.pci_pkt.completion_func = hv_pci_compose_compl;
- ctxt.pci_pkt.compl_ctxt = &comp;
-
- switch (pci_protocol_version) {
- case PCI_PROTOCOL_VERSION_1_1:
- size = hv_compose_msi_req_v1(&ctxt.int_pkts.v1,
- dest,
- hpdev->desc.win_slot.slot,
- cfg->vector);
- break;
-
- case PCI_PROTOCOL_VERSION_1_2:
- size = hv_compose_msi_req_v2(&ctxt.int_pkts.v2,
- dest,
- hpdev->desc.win_slot.slot,
- cfg->vector);
- break;
-
- default:
- /* As we only negotiate protocol versions known to this driver,
- * this path should never hit. However, this is it not a hot
- * path so we print a message to aid future updates.
- */
- dev_err(&hbus->hdev->device,
- "Unexpected vPCI protocol, update driver.");
- goto free_int_desc;
- }
-
- ret = vmbus_sendpacket(hpdev->hbus->hdev->channel, &ctxt.int_pkts,
- size, (unsigned long)&ctxt.pci_pkt,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- if (ret) {
- dev_err(&hbus->hdev->device,
- "Sending request for interrupt failed: 0x%x",
- comp.comp_pkt.completion_status);
- goto free_int_desc;
- }
-
- /*
- * Since this function is called with IRQ locks held, can't
- * do normal wait for completion; instead poll.
- */
- while (!try_wait_for_completion(&comp.comp_pkt.host_event)) {
- /* 0xFFFF means an invalid PCI VENDOR ID. */
- if (hv_pcifront_get_vendor_id(hpdev) == 0xFFFF) {
- dev_err_once(&hbus->hdev->device,
- "the device has gone\n");
- goto free_int_desc;
- }
-
- /*
- * When the higher level interrupt code calls us with
- * interrupt disabled, we must poll the channel by calling
- * the channel callback directly when channel->target_cpu is
- * the current CPU. When the higher level interrupt code
- * calls us with interrupt enabled, let's add the
- * local_bh_disable()/enable() to avoid race.
- */
- local_bh_disable();
-
- if (hbus->hdev->channel->target_cpu == smp_processor_id())
- hv_pci_onchannelcallback(hbus);
-
- local_bh_enable();
-
- if (hpdev->state == hv_pcichild_ejecting) {
- dev_err_once(&hbus->hdev->device,
- "the device is being ejected\n");
- goto free_int_desc;
- }
-
- udelay(100);
- }
-
- if (comp.comp_pkt.completion_status < 0) {
- dev_err(&hbus->hdev->device,
- "Request for interrupt failed: 0x%x",
- comp.comp_pkt.completion_status);
- goto free_int_desc;
- }
-
- /*
- * Record the assignment so that this can be unwound later. Using
- * irq_set_chip_data() here would be appropriate, but the lock it takes
- * is already held.
- */
- *int_desc = comp.int_desc;
- data->chip_data = int_desc;
-
- /* Pass up the result. */
- msg->address_hi = comp.int_desc.address >> 32;
- msg->address_lo = comp.int_desc.address & 0xffffffff;
- msg->data = comp.int_desc.data;
-
- put_pcichild(hpdev);
- return;
-
-free_int_desc:
- kfree(int_desc);
-drop_reference:
- put_pcichild(hpdev);
-return_null_message:
- msg->address_hi = 0;
- msg->address_lo = 0;
- msg->data = 0;
-}
-
-/* HW Interrupt Chip Descriptor */
-static struct irq_chip hv_msi_irq_chip = {
- .name = "Hyper-V PCIe MSI",
- .irq_compose_msi_msg = hv_compose_msi_msg,
- .irq_set_affinity = hv_set_affinity,
- .irq_ack = irq_chip_ack_parent,
- .irq_mask = hv_irq_mask,
- .irq_unmask = hv_irq_unmask,
-};
-
-static irq_hw_number_t hv_msi_domain_ops_get_hwirq(struct msi_domain_info *info,
- msi_alloc_info_t *arg)
-{
- return arg->msi_hwirq;
-}
-
-static struct msi_domain_ops hv_msi_ops = {
- .get_hwirq = hv_msi_domain_ops_get_hwirq,
- .msi_prepare = pci_msi_prepare,
- .set_desc = pci_msi_set_desc,
- .msi_free = hv_msi_free,
-};
-
-/**
- * hv_pcie_init_irq_domain() - Initialize IRQ domain
- * @hbus: The root PCI bus
- *
- * This function creates an IRQ domain which will be used for
- * interrupts from devices that have been passed through. These
- * devices only support MSI and MSI-X, not line-based interrupts
- * or simulations of line-based interrupts through PCIe's
- * fabric-layer messages. Because interrupts are remapped, we
- * can support multi-message MSI here.
- *
- * Return: '0' on success and error value on failure
- */
-static int hv_pcie_init_irq_domain(struct hv_pcibus_device *hbus)
-{
- hbus->msi_info.chip = &hv_msi_irq_chip;
- hbus->msi_info.ops = &hv_msi_ops;
- hbus->msi_info.flags = (MSI_FLAG_USE_DEF_DOM_OPS |
- MSI_FLAG_USE_DEF_CHIP_OPS | MSI_FLAG_MULTI_PCI_MSI |
- MSI_FLAG_PCI_MSIX);
- hbus->msi_info.handler = handle_edge_irq;
- hbus->msi_info.handler_name = "edge";
- hbus->msi_info.data = hbus;
- hbus->irq_domain = pci_msi_create_irq_domain(hbus->sysdata.fwnode,
- &hbus->msi_info,
- x86_vector_domain);
- if (!hbus->irq_domain) {
- dev_err(&hbus->hdev->device,
- "Failed to build an MSI IRQ domain\n");
- return -ENODEV;
- }
-
- return 0;
-}
-
-/**
- * get_bar_size() - Get the address space consumed by a BAR
- * @bar_val: Value that a BAR returned after -1 was written
- * to it.
- *
- * This function returns the size of the BAR, rounded up to 1
- * page. It has to be rounded up because the hypervisor's page
- * table entry that maps the BAR into the VM can't specify an
- * offset within a page. The invariant is that the hypervisor
- * must place any BARs of smaller than page length at the
- * beginning of a page.
- *
- * Return: Size in bytes of the consumed MMIO space.
- */
-static u64 get_bar_size(u64 bar_val)
-{
- return round_up((1 + ~(bar_val & PCI_BASE_ADDRESS_MEM_MASK)),
- PAGE_SIZE);
-}
-
-/**
- * survey_child_resources() - Total all MMIO requirements
- * @hbus: Root PCI bus, as understood by this driver
- */
-static void survey_child_resources(struct hv_pcibus_device *hbus)
-{
- struct hv_pci_dev *hpdev;
- resource_size_t bar_size = 0;
- unsigned long flags;
- struct completion *event;
- u64 bar_val;
- int i;
-
- /* If nobody is waiting on the answer, don't compute it. */
- event = xchg(&hbus->survey_event, NULL);
- if (!event)
- return;
-
- /* If the answer has already been computed, go with it. */
- if (hbus->low_mmio_space || hbus->high_mmio_space) {
- complete(event);
- return;
- }
-
- spin_lock_irqsave(&hbus->device_list_lock, flags);
-
- /*
- * Due to an interesting quirk of the PCI spec, all memory regions
- * for a child device are a power of 2 in size and aligned in memory,
- * so it's sufficient to just add them up without tracking alignment.
- */
- list_for_each_entry(hpdev, &hbus->children, list_entry) {
- for (i = 0; i < 6; i++) {
- if (hpdev->probed_bar[i] & PCI_BASE_ADDRESS_SPACE_IO)
- dev_err(&hbus->hdev->device,
- "There's an I/O BAR in this list!\n");
-
- if (hpdev->probed_bar[i] != 0) {
- /*
- * A probed BAR has all the upper bits set that
- * can be changed.
- */
-
- bar_val = hpdev->probed_bar[i];
- if (bar_val & PCI_BASE_ADDRESS_MEM_TYPE_64)
- bar_val |=
- ((u64)hpdev->probed_bar[++i] << 32);
- else
- bar_val |= 0xffffffff00000000ULL;
-
- bar_size = get_bar_size(bar_val);
-
- if (bar_val & PCI_BASE_ADDRESS_MEM_TYPE_64)
- hbus->high_mmio_space += bar_size;
- else
- hbus->low_mmio_space += bar_size;
- }
- }
- }
-
- spin_unlock_irqrestore(&hbus->device_list_lock, flags);
- complete(event);
-}
-
-/**
- * prepopulate_bars() - Fill in BARs with defaults
- * @hbus: Root PCI bus, as understood by this driver
- *
- * The core PCI driver code seems much, much happier if the BARs
- * for a device have values upon first scan. So fill them in.
- * The algorithm below works down from large sizes to small,
- * attempting to pack the assignments optimally. The assumption,
- * enforced in other parts of the code, is that the beginning of
- * the memory-mapped I/O space will be aligned on the largest
- * BAR size.
- */
-static void prepopulate_bars(struct hv_pcibus_device *hbus)
-{
- resource_size_t high_size = 0;
- resource_size_t low_size = 0;
- resource_size_t high_base = 0;
- resource_size_t low_base = 0;
- resource_size_t bar_size;
- struct hv_pci_dev *hpdev;
- unsigned long flags;
- u64 bar_val;
- u32 command;
- bool high;
- int i;
-
- if (hbus->low_mmio_space) {
- low_size = 1ULL << (63 - __builtin_clzll(hbus->low_mmio_space));
- low_base = hbus->low_mmio_res->start;
- }
-
- if (hbus->high_mmio_space) {
- high_size = 1ULL <<
- (63 - __builtin_clzll(hbus->high_mmio_space));
- high_base = hbus->high_mmio_res->start;
- }
-
- spin_lock_irqsave(&hbus->device_list_lock, flags);
-
- /* Pick addresses for the BARs. */
- do {
- list_for_each_entry(hpdev, &hbus->children, list_entry) {
- for (i = 0; i < 6; i++) {
- bar_val = hpdev->probed_bar[i];
- if (bar_val == 0)
- continue;
- high = bar_val & PCI_BASE_ADDRESS_MEM_TYPE_64;
- if (high) {
- bar_val |=
- ((u64)hpdev->probed_bar[i + 1]
- << 32);
- } else {
- bar_val |= 0xffffffffULL << 32;
- }
- bar_size = get_bar_size(bar_val);
- if (high) {
- if (high_size != bar_size) {
- i++;
- continue;
- }
- _hv_pcifront_write_config(hpdev,
- PCI_BASE_ADDRESS_0 + (4 * i),
- 4,
- (u32)(high_base & 0xffffff00));
- i++;
- _hv_pcifront_write_config(hpdev,
- PCI_BASE_ADDRESS_0 + (4 * i),
- 4, (u32)(high_base >> 32));
- high_base += bar_size;
- } else {
- if (low_size != bar_size)
- continue;
- _hv_pcifront_write_config(hpdev,
- PCI_BASE_ADDRESS_0 + (4 * i),
- 4,
- (u32)(low_base & 0xffffff00));
- low_base += bar_size;
- }
- }
- if (high_size <= 1 && low_size <= 1) {
- /* Set the memory enable bit. */
- _hv_pcifront_read_config(hpdev, PCI_COMMAND, 2,
- &command);
- command |= PCI_COMMAND_MEMORY;
- _hv_pcifront_write_config(hpdev, PCI_COMMAND, 2,
- command);
- break;
- }
- }
-
- high_size >>= 1;
- low_size >>= 1;
- } while (high_size || low_size);
-
- spin_unlock_irqrestore(&hbus->device_list_lock, flags);
-}
-
-/**
- * create_root_hv_pci_bus() - Expose a new root PCI bus
- * @hbus: Root PCI bus, as understood by this driver
- *
- * Return: 0 on success, -errno on failure
- */
-static int create_root_hv_pci_bus(struct hv_pcibus_device *hbus)
-{
- /* Register the device */
- hbus->pci_bus = pci_create_root_bus(&hbus->hdev->device,
- 0, /* bus number is always zero */
- &hv_pcifront_ops,
- &hbus->sysdata,
- &hbus->resources_for_children);
- if (!hbus->pci_bus)
- return -ENODEV;
-
- hbus->pci_bus->msi = &hbus->msi_chip;
- hbus->pci_bus->msi->dev = &hbus->hdev->device;
-
- pci_lock_rescan_remove();
- pci_scan_child_bus(hbus->pci_bus);
- pci_bus_assign_resources(hbus->pci_bus);
- pci_bus_add_devices(hbus->pci_bus);
- pci_unlock_rescan_remove();
- hbus->state = hv_pcibus_installed;
- return 0;
-}
-
-struct q_res_req_compl {
- struct completion host_event;
- struct hv_pci_dev *hpdev;
-};
-
-/**
- * q_resource_requirements() - Query Resource Requirements
- * @context: The completion context.
- * @resp: The response that came from the host.
- * @resp_packet_size: The size in bytes of resp.
- *
- * This function is invoked on completion of a Query Resource
- * Requirements packet.
- */
-static void q_resource_requirements(void *context, struct pci_response *resp,
- int resp_packet_size)
-{
- struct q_res_req_compl *completion = context;
- struct pci_q_res_req_response *q_res_req =
- (struct pci_q_res_req_response *)resp;
- int i;
-
- if (resp->status < 0) {
- dev_err(&completion->hpdev->hbus->hdev->device,
- "query resource requirements failed: %x\n",
- resp->status);
- } else {
- for (i = 0; i < 6; i++) {
- completion->hpdev->probed_bar[i] =
- q_res_req->probed_bar[i];
- }
- }
-
- complete(&completion->host_event);
-}
-
-/**
- * new_pcichild_device() - Create a new child device
- * @hbus: The internal struct tracking this root PCI bus.
- * @desc: The information supplied so far from the host
- * about the device.
- *
- * This function creates the tracking structure for a new child
- * device and kicks off the process of figuring out what it is.
- *
- * Return: Pointer to the new tracking struct
- */
-static struct hv_pci_dev *new_pcichild_device(struct hv_pcibus_device *hbus,
- struct pci_function_description *desc)
-{
- struct hv_pci_dev *hpdev;
- struct pci_child_message *res_req;
- struct q_res_req_compl comp_pkt;
- struct {
- struct pci_packet init_packet;
- u8 buffer[sizeof(struct pci_child_message)];
- } pkt;
- unsigned long flags;
- int ret;
-
- hpdev = kzalloc(sizeof(*hpdev), GFP_ATOMIC);
- if (!hpdev)
- return NULL;
-
- hpdev->hbus = hbus;
-
- memset(&pkt, 0, sizeof(pkt));
- init_completion(&comp_pkt.host_event);
- comp_pkt.hpdev = hpdev;
- pkt.init_packet.compl_ctxt = &comp_pkt;
- pkt.init_packet.completion_func = q_resource_requirements;
- res_req = (struct pci_child_message *)&pkt.init_packet.message;
- res_req->message_type.type = PCI_QUERY_RESOURCE_REQUIREMENTS;
- res_req->wslot.slot = desc->win_slot.slot;
-
- ret = vmbus_sendpacket(hbus->hdev->channel, res_req,
- sizeof(struct pci_child_message),
- (unsigned long)&pkt.init_packet,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- if (ret)
- goto error;
-
- if (wait_for_response(hbus->hdev, &comp_pkt.host_event))
- goto error;
-
- hpdev->desc = *desc;
- refcount_set(&hpdev->refs, 1);
- get_pcichild(hpdev);
- spin_lock_irqsave(&hbus->device_list_lock, flags);
-
- list_add_tail(&hpdev->list_entry, &hbus->children);
- spin_unlock_irqrestore(&hbus->device_list_lock, flags);
- return hpdev;
-
-error:
- kfree(hpdev);
- return NULL;
-}
-
-/**
- * get_pcichild_wslot() - Find device from slot
- * @hbus: Root PCI bus, as understood by this driver
- * @wslot: Location on the bus
- *
- * This function looks up a PCI device and returns the internal
- * representation of it. It acquires a reference on it, so that
- * the device won't be deleted while somebody is using it. The
- * caller is responsible for calling put_pcichild() to release
- * this reference.
- *
- * Return: Internal representation of a PCI device
- */
-static struct hv_pci_dev *get_pcichild_wslot(struct hv_pcibus_device *hbus,
- u32 wslot)
-{
- unsigned long flags;
- struct hv_pci_dev *iter, *hpdev = NULL;
-
- spin_lock_irqsave(&hbus->device_list_lock, flags);
- list_for_each_entry(iter, &hbus->children, list_entry) {
- if (iter->desc.win_slot.slot == wslot) {
- hpdev = iter;
- get_pcichild(hpdev);
- break;
- }
- }
- spin_unlock_irqrestore(&hbus->device_list_lock, flags);
-
- return hpdev;
-}
-
-/**
- * pci_devices_present_work() - Handle new list of child devices
- * @work: Work struct embedded in struct hv_dr_work
- *
- * "Bus Relations" is the Windows term for "children of this
- * bus." The terminology is preserved here for people trying to
- * debug the interaction between Hyper-V and Linux. This
- * function is called when the parent partition reports a list
- * of functions that should be observed under this PCI Express
- * port (bus).
- *
- * This function updates the list, and must tolerate being
- * called multiple times with the same information. The typical
- * number of child devices is one, with very atypical cases
- * involving three or four, so the algorithms used here can be
- * simple and inefficient.
- *
- * It must also treat the omission of a previously observed device as
- * notification that the device no longer exists.
- *
- * Note that this function is serialized with hv_eject_device_work(),
- * because both are pushed to the ordered workqueue hbus->wq.
- */
-static void pci_devices_present_work(struct work_struct *work)
-{
- u32 child_no;
- bool found;
- struct pci_function_description *new_desc;
- struct hv_pci_dev *hpdev;
- struct hv_pcibus_device *hbus;
- struct list_head removed;
- struct hv_dr_work *dr_wrk;
- struct hv_dr_state *dr = NULL;
- unsigned long flags;
-
- dr_wrk = container_of(work, struct hv_dr_work, wrk);
- hbus = dr_wrk->bus;
- kfree(dr_wrk);
-
- INIT_LIST_HEAD(&removed);
-
- /* Pull this off the queue and process it if it was the last one. */
- spin_lock_irqsave(&hbus->device_list_lock, flags);
- while (!list_empty(&hbus->dr_list)) {
- dr = list_first_entry(&hbus->dr_list, struct hv_dr_state,
- list_entry);
- list_del(&dr->list_entry);
-
- /* Throw this away if the list still has stuff in it. */
- if (!list_empty(&hbus->dr_list)) {
- kfree(dr);
- continue;
- }
- }
- spin_unlock_irqrestore(&hbus->device_list_lock, flags);
-
- if (!dr) {
- put_hvpcibus(hbus);
- return;
- }
-
- /* First, mark all existing children as reported missing. */
- spin_lock_irqsave(&hbus->device_list_lock, flags);
- list_for_each_entry(hpdev, &hbus->children, list_entry) {
- hpdev->reported_missing = true;
- }
- spin_unlock_irqrestore(&hbus->device_list_lock, flags);
-
- /* Next, add back any reported devices. */
- for (child_no = 0; child_no < dr->device_count; child_no++) {
- found = false;
- new_desc = &dr->func[child_no];
-
- spin_lock_irqsave(&hbus->device_list_lock, flags);
- list_for_each_entry(hpdev, &hbus->children, list_entry) {
- if ((hpdev->desc.win_slot.slot == new_desc->win_slot.slot) &&
- (hpdev->desc.v_id == new_desc->v_id) &&
- (hpdev->desc.d_id == new_desc->d_id) &&
- (hpdev->desc.ser == new_desc->ser)) {
- hpdev->reported_missing = false;
- found = true;
- }
- }
- spin_unlock_irqrestore(&hbus->device_list_lock, flags);
-
- if (!found) {
- hpdev = new_pcichild_device(hbus, new_desc);
- if (!hpdev)
- dev_err(&hbus->hdev->device,
- "couldn't record a child device.\n");
- }
- }
-
- /* Move missing children to a list on the stack. */
- spin_lock_irqsave(&hbus->device_list_lock, flags);
- do {
- found = false;
- list_for_each_entry(hpdev, &hbus->children, list_entry) {
- if (hpdev->reported_missing) {
- found = true;
- put_pcichild(hpdev);
- list_move_tail(&hpdev->list_entry, &removed);
- break;
- }
- }
- } while (found);
- spin_unlock_irqrestore(&hbus->device_list_lock, flags);
-
- /* Delete everything that should no longer exist. */
- while (!list_empty(&removed)) {
- hpdev = list_first_entry(&removed, struct hv_pci_dev,
- list_entry);
- list_del(&hpdev->list_entry);
- put_pcichild(hpdev);
- }
-
- switch (hbus->state) {
- case hv_pcibus_installed:
- /*
- * Tell the core to rescan bus
- * because there may have been changes.
- */
- pci_lock_rescan_remove();
- pci_scan_child_bus(hbus->pci_bus);
- pci_unlock_rescan_remove();
- break;
-
- case hv_pcibus_init:
- case hv_pcibus_probed:
- survey_child_resources(hbus);
- break;
-
- default:
- break;
- }
-
- put_hvpcibus(hbus);
- kfree(dr);
-}
-
-/**
- * hv_pci_devices_present() - Handles list of new children
- * @hbus: Root PCI bus, as understood by this driver
- * @relations: Packet from host listing children
- *
- * This function is invoked whenever a new list of devices for
- * this bus appears.
- */
-static void hv_pci_devices_present(struct hv_pcibus_device *hbus,
- struct pci_bus_relations *relations)
-{
- struct hv_dr_state *dr;
- struct hv_dr_work *dr_wrk;
- unsigned long flags;
- bool pending_dr;
-
- dr_wrk = kzalloc(sizeof(*dr_wrk), GFP_NOWAIT);
- if (!dr_wrk)
- return;
-
- dr = kzalloc(offsetof(struct hv_dr_state, func) +
- (sizeof(struct pci_function_description) *
- (relations->device_count)), GFP_NOWAIT);
- if (!dr) {
- kfree(dr_wrk);
- return;
- }
-
- INIT_WORK(&dr_wrk->wrk, pci_devices_present_work);
- dr_wrk->bus = hbus;
- dr->device_count = relations->device_count;
- if (dr->device_count != 0) {
- memcpy(dr->func, relations->func,
- sizeof(struct pci_function_description) *
- dr->device_count);
- }
-
- spin_lock_irqsave(&hbus->device_list_lock, flags);
- /*
- * If pending_dr is true, we have already queued a work,
- * which will see the new dr. Otherwise, we need to
- * queue a new work.
- */
- pending_dr = !list_empty(&hbus->dr_list);
- list_add_tail(&dr->list_entry, &hbus->dr_list);
- spin_unlock_irqrestore(&hbus->device_list_lock, flags);
-
- if (pending_dr) {
- kfree(dr_wrk);
- } else {
- get_hvpcibus(hbus);
- queue_work(hbus->wq, &dr_wrk->wrk);
- }
-}
-
-/**
- * hv_eject_device_work() - Asynchronously handles ejection
- * @work: Work struct embedded in internal device struct
- *
- * This function handles ejecting a device. Windows will
- * attempt to gracefully eject a device, waiting 60 seconds to
- * hear back from the guest OS that this completed successfully.
- * If this timer expires, the device will be forcibly removed.
- */
-static void hv_eject_device_work(struct work_struct *work)
-{
- struct pci_eject_response *ejct_pkt;
- struct hv_pci_dev *hpdev;
- struct pci_dev *pdev;
- unsigned long flags;
- int wslot;
- struct {
- struct pci_packet pkt;
- u8 buffer[sizeof(struct pci_eject_response)];
- } ctxt;
-
- hpdev = container_of(work, struct hv_pci_dev, wrk);
-
- WARN_ON(hpdev->state != hv_pcichild_ejecting);
-
- /*
- * Ejection can come before or after the PCI bus has been set up, so
- * attempt to find it and tear down the bus state, if it exists. This
- * must be done without constructs like pci_domain_nr(hbus->pci_bus)
- * because hbus->pci_bus may not exist yet.
- */
- wslot = wslot_to_devfn(hpdev->desc.win_slot.slot);
- pdev = pci_get_domain_bus_and_slot(hpdev->hbus->sysdata.domain, 0,
- wslot);
- if (pdev) {
- pci_lock_rescan_remove();
- pci_stop_and_remove_bus_device(pdev);
- pci_dev_put(pdev);
- pci_unlock_rescan_remove();
- }
-
- spin_lock_irqsave(&hpdev->hbus->device_list_lock, flags);
- list_del(&hpdev->list_entry);
- spin_unlock_irqrestore(&hpdev->hbus->device_list_lock, flags);
-
- memset(&ctxt, 0, sizeof(ctxt));
- ejct_pkt = (struct pci_eject_response *)&ctxt.pkt.message;
- ejct_pkt->message_type.type = PCI_EJECTION_COMPLETE;
- ejct_pkt->wslot.slot = hpdev->desc.win_slot.slot;
- vmbus_sendpacket(hpdev->hbus->hdev->channel, ejct_pkt,
- sizeof(*ejct_pkt), (unsigned long)&ctxt.pkt,
- VM_PKT_DATA_INBAND, 0);
-
- put_pcichild(hpdev);
- put_pcichild(hpdev);
- put_hvpcibus(hpdev->hbus);
-}
-
-/**
- * hv_pci_eject_device() - Handles device ejection
- * @hpdev: Internal device tracking struct
- *
- * This function is invoked when an ejection packet arrives. It
- * just schedules work so that we don't re-enter the packet
- * delivery code handling the ejection.
- */
-static void hv_pci_eject_device(struct hv_pci_dev *hpdev)
-{
- hpdev->state = hv_pcichild_ejecting;
- get_pcichild(hpdev);
- INIT_WORK(&hpdev->wrk, hv_eject_device_work);
- get_hvpcibus(hpdev->hbus);
- queue_work(hpdev->hbus->wq, &hpdev->wrk);
-}
-
-/**
- * hv_pci_onchannelcallback() - Handles incoming packets
- * @context: Internal bus tracking struct
- *
- * This function is invoked whenever the host sends a packet to
- * this channel (which is private to this root PCI bus).
- */
-static void hv_pci_onchannelcallback(void *context)
-{
- const int packet_size = 0x100;
- int ret;
- struct hv_pcibus_device *hbus = context;
- u32 bytes_recvd;
- u64 req_id;
- struct vmpacket_descriptor *desc;
- unsigned char *buffer;
- int bufferlen = packet_size;
- struct pci_packet *comp_packet;
- struct pci_response *response;
- struct pci_incoming_message *new_message;
- struct pci_bus_relations *bus_rel;
- struct pci_dev_incoming *dev_message;
- struct hv_pci_dev *hpdev;
-
- buffer = kmalloc(bufferlen, GFP_ATOMIC);
- if (!buffer)
- return;
-
- while (1) {
- ret = vmbus_recvpacket_raw(hbus->hdev->channel, buffer,
- bufferlen, &bytes_recvd, &req_id);
-
- if (ret == -ENOBUFS) {
- kfree(buffer);
- /* Handle large packet */
- bufferlen = bytes_recvd;
- buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
- if (!buffer)
- return;
- continue;
- }
-
- /* Zero length indicates there are no more packets. */
- if (ret || !bytes_recvd)
- break;
-
- /*
- * All incoming packets must be at least as large as a
- * response.
- */
- if (bytes_recvd <= sizeof(struct pci_response))
- continue;
- desc = (struct vmpacket_descriptor *)buffer;
-
- switch (desc->type) {
- case VM_PKT_COMP:
-
- /*
- * The host is trusted, and thus it's safe to interpret
- * this transaction ID as a pointer.
- */
- comp_packet = (struct pci_packet *)req_id;
- response = (struct pci_response *)buffer;
- comp_packet->completion_func(comp_packet->compl_ctxt,
- response,
- bytes_recvd);
- break;
-
- case VM_PKT_DATA_INBAND:
-
- new_message = (struct pci_incoming_message *)buffer;
- switch (new_message->message_type.type) {
- case PCI_BUS_RELATIONS:
-
- bus_rel = (struct pci_bus_relations *)buffer;
- if (bytes_recvd <
- offsetof(struct pci_bus_relations, func) +
- (sizeof(struct pci_function_description) *
- (bus_rel->device_count))) {
- dev_err(&hbus->hdev->device,
- "bus relations too small\n");
- break;
- }
-
- hv_pci_devices_present(hbus, bus_rel);
- break;
-
- case PCI_EJECT:
-
- dev_message = (struct pci_dev_incoming *)buffer;
- hpdev = get_pcichild_wslot(hbus,
- dev_message->wslot.slot);
- if (hpdev) {
- hv_pci_eject_device(hpdev);
- put_pcichild(hpdev);
- }
- break;
-
- default:
- dev_warn(&hbus->hdev->device,
- "Unimplemented protocol message %x\n",
- new_message->message_type.type);
- break;
- }
- break;
-
- default:
- dev_err(&hbus->hdev->device,
- "unhandled packet type %d, tid %llx len %d\n",
- desc->type, req_id, bytes_recvd);
- break;
- }
- }
-
- kfree(buffer);
-}
-
-/**
- * hv_pci_protocol_negotiation() - Set up protocol
- * @hdev: VMBus's tracking struct for this root PCI bus
- *
- * This driver is intended to support running on Windows 10
- * (server) and later versions. It will not run on earlier
- * versions, as they assume that many of the operations which
- * Linux needs accomplished with a spinlock held were done via
- * asynchronous messaging via VMBus. Windows 10 increases the
- * surface area of PCI emulation so that these actions can take
- * place by suspending a virtual processor for their duration.
- *
- * This function negotiates the channel protocol version,
- * failing if the host doesn't support the necessary protocol
- * level.
- */
-static int hv_pci_protocol_negotiation(struct hv_device *hdev)
-{
- struct pci_version_request *version_req;
- struct hv_pci_compl comp_pkt;
- struct pci_packet *pkt;
- int ret;
- int i;
-
- /*
- * Initiate the handshake with the host and negotiate
- * a version that the host can support. We start with the
- * highest version number and go down if the host cannot
- * support it.
- */
- pkt = kzalloc(sizeof(*pkt) + sizeof(*version_req), GFP_KERNEL);
- if (!pkt)
- return -ENOMEM;
-
- init_completion(&comp_pkt.host_event);
- pkt->completion_func = hv_pci_generic_compl;
- pkt->compl_ctxt = &comp_pkt;
- version_req = (struct pci_version_request *)&pkt->message;
- version_req->message_type.type = PCI_QUERY_PROTOCOL_VERSION;
-
- for (i = 0; i < ARRAY_SIZE(pci_protocol_versions); i++) {
- version_req->protocol_version = pci_protocol_versions[i];
- ret = vmbus_sendpacket(hdev->channel, version_req,
- sizeof(struct pci_version_request),
- (unsigned long)pkt, VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- if (!ret)
- ret = wait_for_response(hdev, &comp_pkt.host_event);
-
- if (ret) {
- dev_err(&hdev->device,
- "PCI Pass-through VSP failed to request version: %d",
- ret);
- goto exit;
- }
-
- if (comp_pkt.completion_status >= 0) {
- pci_protocol_version = pci_protocol_versions[i];
- dev_info(&hdev->device,
- "PCI VMBus probing: Using version %#x\n",
- pci_protocol_version);
- goto exit;
- }
-
- if (comp_pkt.completion_status != STATUS_REVISION_MISMATCH) {
- dev_err(&hdev->device,
- "PCI Pass-through VSP failed version request: %#x",
- comp_pkt.completion_status);
- ret = -EPROTO;
- goto exit;
- }
-
- reinit_completion(&comp_pkt.host_event);
- }
-
- dev_err(&hdev->device,
- "PCI pass-through VSP failed to find supported version");
- ret = -EPROTO;
-
-exit:
- kfree(pkt);
- return ret;
-}
-
-/**
- * hv_pci_free_bridge_windows() - Release memory regions for the
- * bus
- * @hbus: Root PCI bus, as understood by this driver
- */
-static void hv_pci_free_bridge_windows(struct hv_pcibus_device *hbus)
-{
- /*
- * Set the resources back to the way they looked when they
- * were allocated by setting IORESOURCE_BUSY again.
- */
-
- if (hbus->low_mmio_space && hbus->low_mmio_res) {
- hbus->low_mmio_res->flags |= IORESOURCE_BUSY;
- vmbus_free_mmio(hbus->low_mmio_res->start,
- resource_size(hbus->low_mmio_res));
- }
-
- if (hbus->high_mmio_space && hbus->high_mmio_res) {
- hbus->high_mmio_res->flags |= IORESOURCE_BUSY;
- vmbus_free_mmio(hbus->high_mmio_res->start,
- resource_size(hbus->high_mmio_res));
- }
-}
-
-/**
- * hv_pci_allocate_bridge_windows() - Allocate memory regions
- * for the bus
- * @hbus: Root PCI bus, as understood by this driver
- *
- * This function calls vmbus_allocate_mmio(), which is itself a
- * bit of a compromise. Ideally, we might change the pnp layer
- * in the kernel such that it comprehends either PCI devices
- * which are "grandchildren of ACPI," with some intermediate bus
- * node (in this case, VMBus) or change it such that it
- * understands VMBus. The pnp layer, however, has been declared
- * deprecated, and not subject to change.
- *
- * The workaround, implemented here, is to ask VMBus to allocate
- * MMIO space for this bus. VMBus itself knows which ranges are
- * appropriate by looking at its own ACPI objects. Then, after
- * these ranges are claimed, they're modified to look like they
- * would have looked if the ACPI and pnp code had allocated
- * bridge windows. These descriptors have to exist in this form
- * in order to satisfy the code which will get invoked when the
- * endpoint PCI function driver calls request_mem_region() or
- * request_mem_region_exclusive().
- *
- * Return: 0 on success, -errno on failure
- */
-static int hv_pci_allocate_bridge_windows(struct hv_pcibus_device *hbus)
-{
- resource_size_t align;
- int ret;
-
- if (hbus->low_mmio_space) {
- align = 1ULL << (63 - __builtin_clzll(hbus->low_mmio_space));
- ret = vmbus_allocate_mmio(&hbus->low_mmio_res, hbus->hdev, 0,
- (u64)(u32)0xffffffff,
- hbus->low_mmio_space,
- align, false);
- if (ret) {
- dev_err(&hbus->hdev->device,
- "Need %#llx of low MMIO space. Consider reconfiguring the VM.\n",
- hbus->low_mmio_space);
- return ret;
- }
-
- /* Modify this resource to become a bridge window. */
- hbus->low_mmio_res->flags |= IORESOURCE_WINDOW;
- hbus->low_mmio_res->flags &= ~IORESOURCE_BUSY;
- pci_add_resource(&hbus->resources_for_children,
- hbus->low_mmio_res);
- }
-
- if (hbus->high_mmio_space) {
- align = 1ULL << (63 - __builtin_clzll(hbus->high_mmio_space));
- ret = vmbus_allocate_mmio(&hbus->high_mmio_res, hbus->hdev,
- 0x100000000, -1,
- hbus->high_mmio_space, align,
- false);
- if (ret) {
- dev_err(&hbus->hdev->device,
- "Need %#llx of high MMIO space. Consider reconfiguring the VM.\n",
- hbus->high_mmio_space);
- goto release_low_mmio;
- }
-
- /* Modify this resource to become a bridge window. */
- hbus->high_mmio_res->flags |= IORESOURCE_WINDOW;
- hbus->high_mmio_res->flags &= ~IORESOURCE_BUSY;
- pci_add_resource(&hbus->resources_for_children,
- hbus->high_mmio_res);
- }
-
- return 0;
-
-release_low_mmio:
- if (hbus->low_mmio_res) {
- vmbus_free_mmio(hbus->low_mmio_res->start,
- resource_size(hbus->low_mmio_res));
- }
-
- return ret;
-}
-
-/**
- * hv_allocate_config_window() - Find MMIO space for PCI Config
- * @hbus: Root PCI bus, as understood by this driver
- *
- * This function claims memory-mapped I/O space for accessing
- * configuration space for the functions on this bus.
- *
- * Return: 0 on success, -errno on failure
- */
-static int hv_allocate_config_window(struct hv_pcibus_device *hbus)
-{
- int ret;
-
- /*
- * Set up a region of MMIO space to use for accessing configuration
- * space.
- */
- ret = vmbus_allocate_mmio(&hbus->mem_config, hbus->hdev, 0, -1,
- PCI_CONFIG_MMIO_LENGTH, 0x1000, false);
- if (ret)
- return ret;
-
- /*
- * vmbus_allocate_mmio() gets used for allocating both device endpoint
- * resource claims (those which cannot be overlapped) and the ranges
- * which are valid for the children of this bus, which are intended
- * to be overlapped by those children. Set the flag on this claim
- * meaning that this region can't be overlapped.
- */
-
- hbus->mem_config->flags |= IORESOURCE_BUSY;
-
- return 0;
-}
-
-static void hv_free_config_window(struct hv_pcibus_device *hbus)
-{
- vmbus_free_mmio(hbus->mem_config->start, PCI_CONFIG_MMIO_LENGTH);
-}
-
-/**
- * hv_pci_enter_d0() - Bring the "bus" into the D0 power state
- * @hdev: VMBus's tracking struct for this root PCI bus
- *
- * Return: 0 on success, -errno on failure
- */
-static int hv_pci_enter_d0(struct hv_device *hdev)
-{
- struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
- struct pci_bus_d0_entry *d0_entry;
- struct hv_pci_compl comp_pkt;
- struct pci_packet *pkt;
- int ret;
-
- /*
- * Tell the host that the bus is ready to use, and moved into the
- * powered-on state. This includes telling the host which region
- * of memory-mapped I/O space has been chosen for configuration space
- * access.
- */
- pkt = kzalloc(sizeof(*pkt) + sizeof(*d0_entry), GFP_KERNEL);
- if (!pkt)
- return -ENOMEM;
-
- init_completion(&comp_pkt.host_event);
- pkt->completion_func = hv_pci_generic_compl;
- pkt->compl_ctxt = &comp_pkt;
- d0_entry = (struct pci_bus_d0_entry *)&pkt->message;
- d0_entry->message_type.type = PCI_BUS_D0ENTRY;
- d0_entry->mmio_base = hbus->mem_config->start;
-
- ret = vmbus_sendpacket(hdev->channel, d0_entry, sizeof(*d0_entry),
- (unsigned long)pkt, VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- if (!ret)
- ret = wait_for_response(hdev, &comp_pkt.host_event);
-
- if (ret)
- goto exit;
-
- if (comp_pkt.completion_status < 0) {
- dev_err(&hdev->device,
- "PCI Pass-through VSP failed D0 Entry with status %x\n",
- comp_pkt.completion_status);
- ret = -EPROTO;
- goto exit;
- }
-
- ret = 0;
-
-exit:
- kfree(pkt);
- return ret;
-}
-
-/**
- * hv_pci_query_relations() - Ask host to send list of child
- * devices
- * @hdev: VMBus's tracking struct for this root PCI bus
- *
- * Return: 0 on success, -errno on failure
- */
-static int hv_pci_query_relations(struct hv_device *hdev)
-{
- struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
- struct pci_message message;
- struct completion comp;
- int ret;
-
- /* Ask the host to send along the list of child devices */
- init_completion(&comp);
- if (cmpxchg(&hbus->survey_event, NULL, &comp))
- return -ENOTEMPTY;
-
- memset(&message, 0, sizeof(message));
- message.type = PCI_QUERY_BUS_RELATIONS;
-
- ret = vmbus_sendpacket(hdev->channel, &message, sizeof(message),
- 0, VM_PKT_DATA_INBAND, 0);
- if (!ret)
- ret = wait_for_response(hdev, &comp);
-
- return ret;
-}
-
-/**
- * hv_send_resources_allocated() - Report local resource choices
- * @hdev: VMBus's tracking struct for this root PCI bus
- *
- * The host OS is expecting to be sent a request as a message
- * which contains all the resources that the device will use.
- * The response contains those same resources, "translated"
- * which is to say, the values which should be used by the
- * hardware, when it delivers an interrupt. (MMIO resources are
- * used in local terms.) This is nice for Windows, and lines up
- * with the FDO/PDO split, which doesn't exist in Linux. Linux
- * is deeply expecting to scan an emulated PCI configuration
- * space. So this message is sent here only to drive the state
- * machine on the host forward.
- *
- * Return: 0 on success, -errno on failure
- */
-static int hv_send_resources_allocated(struct hv_device *hdev)
-{
- struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
- struct pci_resources_assigned *res_assigned;
- struct pci_resources_assigned2 *res_assigned2;
- struct hv_pci_compl comp_pkt;
- struct hv_pci_dev *hpdev;
- struct pci_packet *pkt;
- size_t size_res;
- u32 wslot;
- int ret;
-
- size_res = (pci_protocol_version < PCI_PROTOCOL_VERSION_1_2)
- ? sizeof(*res_assigned) : sizeof(*res_assigned2);
-
- pkt = kmalloc(sizeof(*pkt) + size_res, GFP_KERNEL);
- if (!pkt)
- return -ENOMEM;
-
- ret = 0;
-
- for (wslot = 0; wslot < 256; wslot++) {
- hpdev = get_pcichild_wslot(hbus, wslot);
- if (!hpdev)
- continue;
-
- memset(pkt, 0, sizeof(*pkt) + size_res);
- init_completion(&comp_pkt.host_event);
- pkt->completion_func = hv_pci_generic_compl;
- pkt->compl_ctxt = &comp_pkt;
-
- if (pci_protocol_version < PCI_PROTOCOL_VERSION_1_2) {
- res_assigned =
- (struct pci_resources_assigned *)&pkt->message;
- res_assigned->message_type.type =
- PCI_RESOURCES_ASSIGNED;
- res_assigned->wslot.slot = hpdev->desc.win_slot.slot;
- } else {
- res_assigned2 =
- (struct pci_resources_assigned2 *)&pkt->message;
- res_assigned2->message_type.type =
- PCI_RESOURCES_ASSIGNED2;
- res_assigned2->wslot.slot = hpdev->desc.win_slot.slot;
- }
- put_pcichild(hpdev);
-
- ret = vmbus_sendpacket(hdev->channel, &pkt->message,
- size_res, (unsigned long)pkt,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- if (!ret)
- ret = wait_for_response(hdev, &comp_pkt.host_event);
- if (ret)
- break;
-
- if (comp_pkt.completion_status < 0) {
- ret = -EPROTO;
- dev_err(&hdev->device,
- "resource allocated returned 0x%x",
- comp_pkt.completion_status);
- break;
- }
- }
-
- kfree(pkt);
- return ret;
-}
-
-/**
- * hv_send_resources_released() - Report local resources
- * released
- * @hdev: VMBus's tracking struct for this root PCI bus
- *
- * Return: 0 on success, -errno on failure
- */
-static int hv_send_resources_released(struct hv_device *hdev)
-{
- struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
- struct pci_child_message pkt;
- struct hv_pci_dev *hpdev;
- u32 wslot;
- int ret;
-
- for (wslot = 0; wslot < 256; wslot++) {
- hpdev = get_pcichild_wslot(hbus, wslot);
- if (!hpdev)
- continue;
-
- memset(&pkt, 0, sizeof(pkt));
- pkt.message_type.type = PCI_RESOURCES_RELEASED;
- pkt.wslot.slot = hpdev->desc.win_slot.slot;
-
- put_pcichild(hpdev);
-
- ret = vmbus_sendpacket(hdev->channel, &pkt, sizeof(pkt), 0,
- VM_PKT_DATA_INBAND, 0);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
-static void get_hvpcibus(struct hv_pcibus_device *hbus)
-{
- refcount_inc(&hbus->remove_lock);
-}
-
-static void put_hvpcibus(struct hv_pcibus_device *hbus)
-{
- if (refcount_dec_and_test(&hbus->remove_lock))
- complete(&hbus->remove_event);
-}
-
-/**
- * hv_pci_probe() - New VMBus channel probe, for a root PCI bus
- * @hdev: VMBus's tracking struct for this root PCI bus
- * @dev_id: Identifies the device itself
- *
- * Return: 0 on success, -errno on failure
- */
-static int hv_pci_probe(struct hv_device *hdev,
- const struct hv_vmbus_device_id *dev_id)
-{
- struct hv_pcibus_device *hbus;
- int ret;
-
- /*
- * hv_pcibus_device contains the hypercall arguments for retargeting in
- * hv_irq_unmask(). Those must not cross a page boundary.
- */
- BUILD_BUG_ON(sizeof(*hbus) > PAGE_SIZE);
-
- hbus = (struct hv_pcibus_device *)get_zeroed_page(GFP_KERNEL);
- if (!hbus)
- return -ENOMEM;
- hbus->state = hv_pcibus_init;
-
- /*
- * The PCI bus "domain" is what is called "segment" in ACPI and
- * other specs. Pull it from the instance ID, to get something
- * unique. Bytes 8 and 9 are what is used in Windows guests, so
- * do the same thing for consistency. Note that, since this code
- * only runs in a Hyper-V VM, Hyper-V can (and does) guarantee
- * that (1) the only domain in use for something that looks like
- * a physical PCI bus (which is actually emulated by the
- * hypervisor) is domain 0 and (2) there will be no overlap
- * between domains derived from these instance IDs in the same
- * VM.
- */
- hbus->sysdata.domain = hdev->dev_instance.b[9] |
- hdev->dev_instance.b[8] << 8;
-
- hbus->hdev = hdev;
- refcount_set(&hbus->remove_lock, 1);
- INIT_LIST_HEAD(&hbus->children);
- INIT_LIST_HEAD(&hbus->dr_list);
- INIT_LIST_HEAD(&hbus->resources_for_children);
- spin_lock_init(&hbus->config_lock);
- spin_lock_init(&hbus->device_list_lock);
- spin_lock_init(&hbus->retarget_msi_interrupt_lock);
- init_completion(&hbus->remove_event);
- hbus->wq = alloc_ordered_workqueue("hv_pci_%x", 0,
- hbus->sysdata.domain);
- if (!hbus->wq) {
- ret = -ENOMEM;
- goto free_bus;
- }
-
- ret = vmbus_open(hdev->channel, pci_ring_size, pci_ring_size, NULL, 0,
- hv_pci_onchannelcallback, hbus);
- if (ret)
- goto destroy_wq;
-
- hv_set_drvdata(hdev, hbus);
-
- ret = hv_pci_protocol_negotiation(hdev);
- if (ret)
- goto close;
-
- ret = hv_allocate_config_window(hbus);
- if (ret)
- goto close;
-
- hbus->cfg_addr = ioremap(hbus->mem_config->start,
- PCI_CONFIG_MMIO_LENGTH);
- if (!hbus->cfg_addr) {
- dev_err(&hdev->device,
- "Unable to map a virtual address for config space\n");
- ret = -ENOMEM;
- goto free_config;
- }
-
- hbus->sysdata.fwnode = irq_domain_alloc_fwnode(hbus);
- if (!hbus->sysdata.fwnode) {
- ret = -ENOMEM;
- goto unmap;
- }
-
- ret = hv_pcie_init_irq_domain(hbus);
- if (ret)
- goto free_fwnode;
-
- ret = hv_pci_query_relations(hdev);
- if (ret)
- goto free_irq_domain;
-
- ret = hv_pci_enter_d0(hdev);
- if (ret)
- goto free_irq_domain;
-
- ret = hv_pci_allocate_bridge_windows(hbus);
- if (ret)
- goto free_irq_domain;
-
- ret = hv_send_resources_allocated(hdev);
- if (ret)
- goto free_windows;
-
- prepopulate_bars(hbus);
-
- hbus->state = hv_pcibus_probed;
-
- ret = create_root_hv_pci_bus(hbus);
- if (ret)
- goto free_windows;
-
- return 0;
-
-free_windows:
- hv_pci_free_bridge_windows(hbus);
-free_irq_domain:
- irq_domain_remove(hbus->irq_domain);
-free_fwnode:
- irq_domain_free_fwnode(hbus->sysdata.fwnode);
-unmap:
- iounmap(hbus->cfg_addr);
-free_config:
- hv_free_config_window(hbus);
-close:
- vmbus_close(hdev->channel);
-destroy_wq:
- destroy_workqueue(hbus->wq);
-free_bus:
- free_page((unsigned long)hbus);
- return ret;
-}
-
-static void hv_pci_bus_exit(struct hv_device *hdev)
-{
- struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
- struct {
- struct pci_packet teardown_packet;
- u8 buffer[sizeof(struct pci_message)];
- } pkt;
- struct pci_bus_relations relations;
- struct hv_pci_compl comp_pkt;
- int ret;
-
- /*
- * After the host sends the RESCIND_CHANNEL message, it doesn't
- * access the per-channel ringbuffer any longer.
- */
- if (hdev->channel->rescind)
- return;
-
- /* Delete any children which might still exist. */
- memset(&relations, 0, sizeof(relations));
- hv_pci_devices_present(hbus, &relations);
-
- ret = hv_send_resources_released(hdev);
- if (ret)
- dev_err(&hdev->device,
- "Couldn't send resources released packet(s)\n");
-
- memset(&pkt.teardown_packet, 0, sizeof(pkt.teardown_packet));
- init_completion(&comp_pkt.host_event);
- pkt.teardown_packet.completion_func = hv_pci_generic_compl;
- pkt.teardown_packet.compl_ctxt = &comp_pkt;
- pkt.teardown_packet.message[0].type = PCI_BUS_D0EXIT;
-
- ret = vmbus_sendpacket(hdev->channel, &pkt.teardown_packet.message,
- sizeof(struct pci_message),
- (unsigned long)&pkt.teardown_packet,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- if (!ret)
- wait_for_completion_timeout(&comp_pkt.host_event, 10 * HZ);
-}
-
-/**
- * hv_pci_remove() - Remove routine for this VMBus channel
- * @hdev: VMBus's tracking struct for this root PCI bus
- *
- * Return: 0 on success, -errno on failure
- */
-static int hv_pci_remove(struct hv_device *hdev)
-{
- struct hv_pcibus_device *hbus;
-
- hbus = hv_get_drvdata(hdev);
- if (hbus->state == hv_pcibus_installed) {
- /* Remove the bus from PCI's point of view. */
- pci_lock_rescan_remove();
- pci_stop_root_bus(hbus->pci_bus);
- pci_remove_root_bus(hbus->pci_bus);
- pci_unlock_rescan_remove();
- hbus->state = hv_pcibus_removed;
- }
-
- hv_pci_bus_exit(hdev);
-
- vmbus_close(hdev->channel);
-
- iounmap(hbus->cfg_addr);
- hv_free_config_window(hbus);
- pci_free_resource_list(&hbus->resources_for_children);
- hv_pci_free_bridge_windows(hbus);
- irq_domain_remove(hbus->irq_domain);
- irq_domain_free_fwnode(hbus->sysdata.fwnode);
- put_hvpcibus(hbus);
- wait_for_completion(&hbus->remove_event);
- destroy_workqueue(hbus->wq);
- free_page((unsigned long)hbus);
- return 0;
-}
-
-static const struct hv_vmbus_device_id hv_pci_id_table[] = {
- /* PCI Pass-through Class ID */
- /* 44C4F61D-4444-4400-9D52-802E27EDE19F */
- { HV_PCIE_GUID, },
- { },
-};
-
-MODULE_DEVICE_TABLE(vmbus, hv_pci_id_table);
-
-static struct hv_driver hv_pci_drv = {
- .name = "hv_pci",
- .id_table = hv_pci_id_table,
- .probe = hv_pci_probe,
- .remove = hv_pci_remove,
-};
-
-static void __exit exit_hv_pci_drv(void)
-{
- vmbus_driver_unregister(&hv_pci_drv);
-}
-
-static int __init init_hv_pci_drv(void)
-{
- return vmbus_driver_register(&hv_pci_drv);
-}
-
-module_init(init_hv_pci_drv);
-module_exit(exit_hv_pci_drv);
-
-MODULE_DESCRIPTION("Hyper-V PCI");
-MODULE_LICENSE("GPL v2");
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