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kernel/drivers/misc/vmw_vmci/vmci_guest.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* VMware VMCI Driver
*
* Copyright (C) 2012 VMware, Inc. All rights reserved.
*/
#include <linux/vmw_vmci_defs.h>
#include <linux/vmw_vmci_api.h>
#include <linux/moduleparam.h>
#include <linux/interrupt.h>
#include <linux/highmem.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/processor.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/vmalloc.h>
#include "vmci_datagram.h"
#include "vmci_doorbell.h"
#include "vmci_context.h"
#include "vmci_driver.h"
#include "vmci_event.h"
#define PCI_DEVICE_ID_VMWARE_VMCI 0x0740
#define VMCI_UTIL_NUM_RESOURCES 1
/*
* Datagram buffers for DMA send/receive must accommodate at least
* a maximum sized datagram and the header.
*/
#define VMCI_DMA_DG_BUFFER_SIZE (VMCI_MAX_DG_SIZE + PAGE_SIZE)
static bool vmci_disable_msi;
module_param_named(disable_msi, vmci_disable_msi, bool, 0);
MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
static bool vmci_disable_msix;
module_param_named(disable_msix, vmci_disable_msix, bool, 0);
MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
static u32 ctx_update_sub_id = VMCI_INVALID_ID;
static u32 vm_context_id = VMCI_INVALID_ID;
struct vmci_guest_device {
struct device *dev; /* PCI device we are attached to */
void __iomem *iobase;
void __iomem *mmio_base;
bool exclusive_vectors;
struct wait_queue_head inout_wq;
void *data_buffer;
dma_addr_t data_buffer_base;
void *tx_buffer;
dma_addr_t tx_buffer_base;
void *notification_bitmap;
dma_addr_t notification_base;
};
static bool use_ppn64;
bool vmci_use_ppn64(void)
{
return use_ppn64;
}
/* vmci_dev singleton device and supporting data*/
struct pci_dev *vmci_pdev;
static struct vmci_guest_device *vmci_dev_g;
static DEFINE_SPINLOCK(vmci_dev_spinlock);
static atomic_t vmci_num_guest_devices = ATOMIC_INIT(0);
bool vmci_guest_code_active(void)
{
return atomic_read(&vmci_num_guest_devices) != 0;
}
u32 vmci_get_vm_context_id(void)
{
if (vm_context_id == VMCI_INVALID_ID) {
struct vmci_datagram get_cid_msg;
get_cid_msg.dst =
vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
VMCI_GET_CONTEXT_ID);
get_cid_msg.src = VMCI_ANON_SRC_HANDLE;
get_cid_msg.payload_size = 0;
vm_context_id = vmci_send_datagram(&get_cid_msg);
}
return vm_context_id;
}
static unsigned int vmci_read_reg(struct vmci_guest_device *dev, u32 reg)
{
if (dev->mmio_base != NULL)
return readl(dev->mmio_base + reg);
return ioread32(dev->iobase + reg);
}
static void vmci_write_reg(struct vmci_guest_device *dev, u32 val, u32 reg)
{
if (dev->mmio_base != NULL)
writel(val, dev->mmio_base + reg);
else
iowrite32(val, dev->iobase + reg);
}
static void vmci_read_data(struct vmci_guest_device *vmci_dev,
void *dest, size_t size)
{
if (vmci_dev->mmio_base == NULL)
ioread8_rep(vmci_dev->iobase + VMCI_DATA_IN_ADDR,
dest, size);
else {
/*
* For DMA datagrams, the data_buffer will contain the header on the
* first page, followed by the incoming datagram(s) on the following
* pages. The header uses an S/G element immediately following the
* header on the first page to point to the data area.
*/
struct vmci_data_in_out_header *buffer_header = vmci_dev->data_buffer;
struct vmci_sg_elem *sg_array = (struct vmci_sg_elem *)(buffer_header + 1);
size_t buffer_offset = dest - vmci_dev->data_buffer;
buffer_header->opcode = 1;
buffer_header->size = 1;
buffer_header->busy = 0;
sg_array[0].addr = vmci_dev->data_buffer_base + buffer_offset;
sg_array[0].size = size;
vmci_write_reg(vmci_dev, lower_32_bits(vmci_dev->data_buffer_base),
VMCI_DATA_IN_LOW_ADDR);
wait_event(vmci_dev->inout_wq, buffer_header->busy == 1);
}
}
static int vmci_write_data(struct vmci_guest_device *dev,
struct vmci_datagram *dg)
{
int result;
if (dev->mmio_base != NULL) {
struct vmci_data_in_out_header *buffer_header = dev->tx_buffer;
u8 *dg_out_buffer = (u8 *)(buffer_header + 1);
if (VMCI_DG_SIZE(dg) > VMCI_MAX_DG_SIZE)
return VMCI_ERROR_INVALID_ARGS;
/*
* Initialize send buffer with outgoing datagram
* and set up header for inline data. Device will
* not access buffer asynchronously - only after
* the write to VMCI_DATA_OUT_LOW_ADDR.
*/
memcpy(dg_out_buffer, dg, VMCI_DG_SIZE(dg));
buffer_header->opcode = 0;
buffer_header->size = VMCI_DG_SIZE(dg);
buffer_header->busy = 1;
vmci_write_reg(dev, lower_32_bits(dev->tx_buffer_base),
VMCI_DATA_OUT_LOW_ADDR);
/* Caller holds a spinlock, so cannot block. */
spin_until_cond(buffer_header->busy == 0);
result = vmci_read_reg(vmci_dev_g, VMCI_RESULT_LOW_ADDR);
if (result == VMCI_SUCCESS)
result = (int)buffer_header->result;
} else {
iowrite8_rep(dev->iobase + VMCI_DATA_OUT_ADDR,
dg, VMCI_DG_SIZE(dg));
result = vmci_read_reg(vmci_dev_g, VMCI_RESULT_LOW_ADDR);
}
return result;
}
/*
* VM to hypervisor call mechanism. We use the standard VMware naming
* convention since shared code is calling this function as well.
*/
int vmci_send_datagram(struct vmci_datagram *dg)
{
unsigned long flags;
int result;
/* Check args. */
if (dg == NULL)
return VMCI_ERROR_INVALID_ARGS;
/*
* Need to acquire spinlock on the device because the datagram
* data may be spread over multiple pages and the monitor may
* interleave device user rpc calls from multiple
* VCPUs. Acquiring the spinlock precludes that
* possibility. Disabling interrupts to avoid incoming
* datagrams during a "rep out" and possibly landing up in
* this function.
*/
spin_lock_irqsave(&vmci_dev_spinlock, flags);
if (vmci_dev_g) {
vmci_write_data(vmci_dev_g, dg);
result = vmci_read_reg(vmci_dev_g, VMCI_RESULT_LOW_ADDR);
} else {
result = VMCI_ERROR_UNAVAILABLE;
}
spin_unlock_irqrestore(&vmci_dev_spinlock, flags);
return result;
}
EXPORT_SYMBOL_GPL(vmci_send_datagram);
/*
* Gets called with the new context id if updated or resumed.
* Context id.
*/
static void vmci_guest_cid_update(u32 sub_id,
const struct vmci_event_data *event_data,
void *client_data)
{
const struct vmci_event_payld_ctx *ev_payload =
vmci_event_data_const_payload(event_data);
if (sub_id != ctx_update_sub_id) {
pr_devel("Invalid subscriber (ID=0x%x)\n", sub_id);
return;
}
if (!event_data || ev_payload->context_id == VMCI_INVALID_ID) {
pr_devel("Invalid event data\n");
return;
}
pr_devel("Updating context from (ID=0x%x) to (ID=0x%x) on event (type=%d)\n",
vm_context_id, ev_payload->context_id, event_data->event);
vm_context_id = ev_payload->context_id;
}
/*
* Verify that the host supports the hypercalls we need. If it does not,
* try to find fallback hypercalls and use those instead. Returns 0 if
* required hypercalls (or fallback hypercalls) are supported by the host,
* an error code otherwise.
*/
static int vmci_check_host_caps(struct pci_dev *pdev)
{
bool result;
struct vmci_resource_query_msg *msg;
u32 msg_size = sizeof(struct vmci_resource_query_hdr) +
VMCI_UTIL_NUM_RESOURCES * sizeof(u32);
struct vmci_datagram *check_msg;
check_msg = kzalloc(msg_size, GFP_KERNEL);
if (!check_msg) {
dev_err(&pdev->dev, "%s: Insufficient memory\n", __func__);
return -ENOMEM;
}
check_msg->dst = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
VMCI_RESOURCES_QUERY);
check_msg->src = VMCI_ANON_SRC_HANDLE;
check_msg->payload_size = msg_size - VMCI_DG_HEADERSIZE;
msg = (struct vmci_resource_query_msg *)VMCI_DG_PAYLOAD(check_msg);
msg->num_resources = VMCI_UTIL_NUM_RESOURCES;
msg->resources[0] = VMCI_GET_CONTEXT_ID;
/* Checks that hyper calls are supported */
result = vmci_send_datagram(check_msg) == 0x01;
kfree(check_msg);
dev_dbg(&pdev->dev, "%s: Host capability check: %s\n",
__func__, result ? "PASSED" : "FAILED");
/* We need the vector. There are no fallbacks. */
return result ? 0 : -ENXIO;
}
/*
* Reads datagrams from the device and dispatches them. For IO port
* based access to the device, we always start reading datagrams into
* only the first page of the datagram buffer. If the datagrams don't
* fit into one page, we use the maximum datagram buffer size for the
* remainder of the invocation. This is a simple heuristic for not
* penalizing small datagrams. For DMA-based datagrams, we always
* use the maximum datagram buffer size, since there is no performance
* penalty for doing so.
*
* This function assumes that it has exclusive access to the data
* in register(s) for the duration of the call.
*/
static void vmci_dispatch_dgs(struct vmci_guest_device *vmci_dev)
{
u8 *dg_in_buffer = vmci_dev->data_buffer;
struct vmci_datagram *dg;
size_t dg_in_buffer_size = VMCI_MAX_DG_SIZE;
size_t current_dg_in_buffer_size;
size_t remaining_bytes;
bool is_io_port = vmci_dev->mmio_base == NULL;
BUILD_BUG_ON(VMCI_MAX_DG_SIZE < PAGE_SIZE);
if (!is_io_port) {
/* For mmio, the first page is used for the header. */
dg_in_buffer += PAGE_SIZE;
/*
* For DMA-based datagram operations, there is no performance
* penalty for reading the maximum buffer size.
*/
current_dg_in_buffer_size = VMCI_MAX_DG_SIZE;
} else {
current_dg_in_buffer_size = PAGE_SIZE;
}
vmci_read_data(vmci_dev, dg_in_buffer, current_dg_in_buffer_size);
dg = (struct vmci_datagram *)dg_in_buffer;
remaining_bytes = current_dg_in_buffer_size;
/*
* Read through the buffer until an invalid datagram header is
* encountered. The exit condition for datagrams read through
* VMCI_DATA_IN_ADDR is a bit more complicated, since a datagram
* can start on any page boundary in the buffer.
*/
while (dg->dst.resource != VMCI_INVALID_ID ||
(is_io_port && remaining_bytes > PAGE_SIZE)) {
unsigned dg_in_size;
/*
* If using VMCI_DATA_IN_ADDR, skip to the next page
* as a datagram can start on any page boundary.
*/
if (dg->dst.resource == VMCI_INVALID_ID) {
dg = (struct vmci_datagram *)roundup(
(uintptr_t)dg + 1, PAGE_SIZE);
remaining_bytes =
(size_t)(dg_in_buffer +
current_dg_in_buffer_size -
(u8 *)dg);
continue;
}
dg_in_size = VMCI_DG_SIZE_ALIGNED(dg);
if (dg_in_size <= dg_in_buffer_size) {
int result;
/*
* If the remaining bytes in the datagram
* buffer doesn't contain the complete
* datagram, we first make sure we have enough
* room for it and then we read the reminder
* of the datagram and possibly any following
* datagrams.
*/
if (dg_in_size > remaining_bytes) {
if (remaining_bytes !=
current_dg_in_buffer_size) {
/*
* We move the partial
* datagram to the front and
* read the reminder of the
* datagram and possibly
* following calls into the
* following bytes.
*/
memmove(dg_in_buffer, dg_in_buffer +
current_dg_in_buffer_size -
remaining_bytes,
remaining_bytes);
dg = (struct vmci_datagram *)
dg_in_buffer;
}
if (current_dg_in_buffer_size !=
dg_in_buffer_size)
current_dg_in_buffer_size =
dg_in_buffer_size;
vmci_read_data(vmci_dev,
dg_in_buffer +
remaining_bytes,
current_dg_in_buffer_size -
remaining_bytes);
}
/*
* We special case event datagrams from the
* hypervisor.
*/
if (dg->src.context == VMCI_HYPERVISOR_CONTEXT_ID &&
dg->dst.resource == VMCI_EVENT_HANDLER) {
result = vmci_event_dispatch(dg);
} else {
result = vmci_datagram_invoke_guest_handler(dg);
}
if (result < VMCI_SUCCESS)
dev_dbg(vmci_dev->dev,
"Datagram with resource (ID=0x%x) failed (err=%d)\n",
dg->dst.resource, result);
/* On to the next datagram. */
dg = (struct vmci_datagram *)((u8 *)dg +
dg_in_size);
} else {
size_t bytes_to_skip;
/*
* Datagram doesn't fit in datagram buffer of maximal
* size. We drop it.
*/
dev_dbg(vmci_dev->dev,
"Failed to receive datagram (size=%u bytes)\n",
dg_in_size);
bytes_to_skip = dg_in_size - remaining_bytes;
if (current_dg_in_buffer_size != dg_in_buffer_size)
current_dg_in_buffer_size = dg_in_buffer_size;
for (;;) {
vmci_read_data(vmci_dev, dg_in_buffer,
current_dg_in_buffer_size);
if (bytes_to_skip <= current_dg_in_buffer_size)
break;
bytes_to_skip -= current_dg_in_buffer_size;
}
dg = (struct vmci_datagram *)(dg_in_buffer +
bytes_to_skip);
}
remaining_bytes =
(size_t) (dg_in_buffer + current_dg_in_buffer_size -
(u8 *)dg);
if (remaining_bytes < VMCI_DG_HEADERSIZE) {
/* Get the next batch of datagrams. */
vmci_read_data(vmci_dev, dg_in_buffer,
current_dg_in_buffer_size);
dg = (struct vmci_datagram *)dg_in_buffer;
remaining_bytes = current_dg_in_buffer_size;
}
}
}
/*
* Scans the notification bitmap for raised flags, clears them
* and handles the notifications.
*/
static void vmci_process_bitmap(struct vmci_guest_device *dev)
{
if (!dev->notification_bitmap) {
dev_dbg(dev->dev, "No bitmap present in %s\n", __func__);
return;
}
vmci_dbell_scan_notification_entries(dev->notification_bitmap);
}
/*
* Interrupt handler for legacy or MSI interrupt, or for first MSI-X
* interrupt (vector VMCI_INTR_DATAGRAM).
*/
static irqreturn_t vmci_interrupt(int irq, void *_dev)
{
struct vmci_guest_device *dev = _dev;
/*
* If we are using MSI-X with exclusive vectors then we simply call
* vmci_dispatch_dgs(), since we know the interrupt was meant for us.
* Otherwise we must read the ICR to determine what to do.
*/
if (dev->exclusive_vectors) {
vmci_dispatch_dgs(dev);
} else {
unsigned int icr;
/* Acknowledge interrupt and determine what needs doing. */
icr = vmci_read_reg(dev, VMCI_ICR_ADDR);
if (icr == 0 || icr == ~0)
return IRQ_NONE;
if (icr & VMCI_ICR_DATAGRAM) {
vmci_dispatch_dgs(dev);
icr &= ~VMCI_ICR_DATAGRAM;
}
if (icr & VMCI_ICR_NOTIFICATION) {
vmci_process_bitmap(dev);
icr &= ~VMCI_ICR_NOTIFICATION;
}
if (icr & VMCI_ICR_DMA_DATAGRAM) {
wake_up_all(&dev->inout_wq);
icr &= ~VMCI_ICR_DMA_DATAGRAM;
}
if (icr != 0)
dev_warn(dev->dev,
"Ignoring unknown interrupt cause (%d)\n",
icr);
}
return IRQ_HANDLED;
}
/*
* Interrupt handler for MSI-X interrupt vector VMCI_INTR_NOTIFICATION,
* which is for the notification bitmap. Will only get called if we are
* using MSI-X with exclusive vectors.
*/
static irqreturn_t vmci_interrupt_bm(int irq, void *_dev)
{
struct vmci_guest_device *dev = _dev;
/* For MSI-X we can just assume it was meant for us. */
vmci_process_bitmap(dev);
return IRQ_HANDLED;
}
/*
* Interrupt handler for MSI-X interrupt vector VMCI_INTR_DMA_DATAGRAM,
* which is for the completion of a DMA datagram send or receive operation.
* Will only get called if we are using MSI-X with exclusive vectors.
*/
static irqreturn_t vmci_interrupt_dma_datagram(int irq, void *_dev)
{
struct vmci_guest_device *dev = _dev;
wake_up_all(&dev->inout_wq);
return IRQ_HANDLED;
}
static void vmci_free_dg_buffers(struct vmci_guest_device *vmci_dev)
{
if (vmci_dev->mmio_base != NULL) {
if (vmci_dev->tx_buffer != NULL)
dma_free_coherent(vmci_dev->dev,
VMCI_DMA_DG_BUFFER_SIZE,
vmci_dev->tx_buffer,
vmci_dev->tx_buffer_base);
if (vmci_dev->data_buffer != NULL)
dma_free_coherent(vmci_dev->dev,
VMCI_DMA_DG_BUFFER_SIZE,
vmci_dev->data_buffer,
vmci_dev->data_buffer_base);
} else {
vfree(vmci_dev->data_buffer);
}
}
/*
* Most of the initialization at module load time is done here.
*/
static int vmci_guest_probe_device(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct vmci_guest_device *vmci_dev;
void __iomem *iobase = NULL;
void __iomem *mmio_base = NULL;
unsigned int num_irq_vectors;
unsigned int capabilities;
unsigned int caps_in_use;
unsigned long cmd;
int vmci_err;
int error;
dev_dbg(&pdev->dev, "Probing for vmci/PCI guest device\n");
error = pcim_enable_device(pdev);
if (error) {
dev_err(&pdev->dev,
"Failed to enable VMCI device: %d\n", error);
return error;
}
/*
* The VMCI device with mmio access to registers requests 256KB
* for BAR1. If present, driver will use new VMCI device
* functionality for register access and datagram send/recv.
*/
if (pci_resource_len(pdev, 1) == VMCI_WITH_MMIO_ACCESS_BAR_SIZE) {
dev_info(&pdev->dev, "MMIO register access is available\n");
mmio_base = pci_iomap_range(pdev, 1, VMCI_MMIO_ACCESS_OFFSET,
VMCI_MMIO_ACCESS_SIZE);
/* If the map fails, we fall back to IOIO access. */
if (!mmio_base)
dev_warn(&pdev->dev, "Failed to map MMIO register access\n");
}
if (!mmio_base) {
if (IS_ENABLED(CONFIG_ARM64)) {
dev_err(&pdev->dev, "MMIO base is invalid\n");
return -ENXIO;
}
error = pcim_iomap_regions(pdev, BIT(0), KBUILD_MODNAME);
if (error) {
dev_err(&pdev->dev, "Failed to reserve/map IO regions\n");
return error;
}
iobase = pcim_iomap_table(pdev)[0];
}
vmci_dev = devm_kzalloc(&pdev->dev, sizeof(*vmci_dev), GFP_KERNEL);
if (!vmci_dev) {
dev_err(&pdev->dev,
"Can't allocate memory for VMCI device\n");
return -ENOMEM;
}
vmci_dev->dev = &pdev->dev;
vmci_dev->exclusive_vectors = false;
vmci_dev->iobase = iobase;
vmci_dev->mmio_base = mmio_base;
init_waitqueue_head(&vmci_dev->inout_wq);
if (mmio_base != NULL) {
vmci_dev->tx_buffer = dma_alloc_coherent(&pdev->dev, VMCI_DMA_DG_BUFFER_SIZE,
&vmci_dev->tx_buffer_base,
GFP_KERNEL);
if (!vmci_dev->tx_buffer) {
dev_err(&pdev->dev,
"Can't allocate memory for datagram tx buffer\n");
return -ENOMEM;
}
vmci_dev->data_buffer = dma_alloc_coherent(&pdev->dev, VMCI_DMA_DG_BUFFER_SIZE,
&vmci_dev->data_buffer_base,
GFP_KERNEL);
} else {
vmci_dev->data_buffer = vmalloc(VMCI_MAX_DG_SIZE);
}
if (!vmci_dev->data_buffer) {
dev_err(&pdev->dev,
"Can't allocate memory for datagram buffer\n");
error = -ENOMEM;
goto err_free_data_buffers;
}
pci_set_master(pdev); /* To enable queue_pair functionality. */
/*
* Verify that the VMCI Device supports the capabilities that
* we need. If the device is missing capabilities that we would
* like to use, check for fallback capabilities and use those
* instead (so we can run a new VM on old hosts). Fail the load if
* a required capability is missing and there is no fallback.
*
* Right now, we need datagrams. There are no fallbacks.
*/
capabilities = vmci_read_reg(vmci_dev, VMCI_CAPS_ADDR);
if (!(capabilities & VMCI_CAPS_DATAGRAM)) {
dev_err(&pdev->dev, "Device does not support datagrams\n");
error = -ENXIO;
goto err_free_data_buffers;
}
caps_in_use = VMCI_CAPS_DATAGRAM;
/*
* Use 64-bit PPNs if the device supports.
*
* There is no check for the return value of dma_set_mask_and_coherent
* since this driver can handle the default mask values if
* dma_set_mask_and_coherent fails.
*/
if (capabilities & VMCI_CAPS_PPN64) {
dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
use_ppn64 = true;
caps_in_use |= VMCI_CAPS_PPN64;
} else {
dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(44));
use_ppn64 = false;
}
/*
* If the hardware supports notifications, we will use that as
* well.
*/
if (capabilities & VMCI_CAPS_NOTIFICATIONS) {
vmci_dev->notification_bitmap = dma_alloc_coherent(
&pdev->dev, PAGE_SIZE, &vmci_dev->notification_base,
GFP_KERNEL);
if (!vmci_dev->notification_bitmap)
dev_warn(&pdev->dev,
"Unable to allocate notification bitmap\n");
else
caps_in_use |= VMCI_CAPS_NOTIFICATIONS;
}
if (mmio_base != NULL) {
if (capabilities & VMCI_CAPS_DMA_DATAGRAM) {
caps_in_use |= VMCI_CAPS_DMA_DATAGRAM;
} else {
dev_err(&pdev->dev,
"Missing capability: VMCI_CAPS_DMA_DATAGRAM\n");
error = -ENXIO;
goto err_free_notification_bitmap;
}
}
dev_info(&pdev->dev, "Using capabilities 0x%x\n", caps_in_use);
/* Let the host know which capabilities we intend to use. */
vmci_write_reg(vmci_dev, caps_in_use, VMCI_CAPS_ADDR);
if (caps_in_use & VMCI_CAPS_DMA_DATAGRAM) {
/* Let the device know the size for pages passed down. */
vmci_write_reg(vmci_dev, PAGE_SHIFT, VMCI_GUEST_PAGE_SHIFT);
/* Configure the high order parts of the data in/out buffers. */
vmci_write_reg(vmci_dev, upper_32_bits(vmci_dev->data_buffer_base),
VMCI_DATA_IN_HIGH_ADDR);
vmci_write_reg(vmci_dev, upper_32_bits(vmci_dev->tx_buffer_base),
VMCI_DATA_OUT_HIGH_ADDR);
}
/* Set up global device so that we can start sending datagrams */
spin_lock_irq(&vmci_dev_spinlock);
vmci_dev_g = vmci_dev;
vmci_pdev = pdev;
spin_unlock_irq(&vmci_dev_spinlock);
/*
* Register notification bitmap with device if that capability is
* used.
*/
if (caps_in_use & VMCI_CAPS_NOTIFICATIONS) {
unsigned long bitmap_ppn =
vmci_dev->notification_base >> PAGE_SHIFT;
if (!vmci_dbell_register_notification_bitmap(bitmap_ppn)) {
dev_warn(&pdev->dev,
"VMCI device unable to register notification bitmap with PPN 0x%lx\n",
bitmap_ppn);
error = -ENXIO;
goto err_remove_vmci_dev_g;
}
}
/* Check host capabilities. */
error = vmci_check_host_caps(pdev);
if (error)
goto err_remove_vmci_dev_g;
/* Enable device. */
/*
* We subscribe to the VMCI_EVENT_CTX_ID_UPDATE here so we can
* update the internal context id when needed.
*/
vmci_err = vmci_event_subscribe(VMCI_EVENT_CTX_ID_UPDATE,
vmci_guest_cid_update, NULL,
&ctx_update_sub_id);
if (vmci_err < VMCI_SUCCESS)
dev_warn(&pdev->dev,
"Failed to subscribe to event (type=%d): %d\n",
VMCI_EVENT_CTX_ID_UPDATE, vmci_err);
/*
* Enable interrupts. Try MSI-X first, then MSI, and then fallback on
* legacy interrupts.
*/
if (vmci_dev->mmio_base != NULL)
num_irq_vectors = VMCI_MAX_INTRS;
else
num_irq_vectors = VMCI_MAX_INTRS_NOTIFICATION;
error = pci_alloc_irq_vectors(pdev, num_irq_vectors, num_irq_vectors,
PCI_IRQ_MSIX);
if (error < 0) {
error = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
if (error < 0)
goto err_unsubscribe_event;
} else {
vmci_dev->exclusive_vectors = true;
}
/*
* Request IRQ for legacy or MSI interrupts, or for first
* MSI-X vector.
*/
error = request_threaded_irq(pci_irq_vector(pdev, 0), NULL,
vmci_interrupt, IRQF_SHARED,
KBUILD_MODNAME, vmci_dev);
if (error) {
dev_err(&pdev->dev, "Irq %u in use: %d\n",
pci_irq_vector(pdev, 0), error);
goto err_disable_msi;
}
/*
* For MSI-X with exclusive vectors we need to request an
* interrupt for each vector so that we get a separate
* interrupt handler routine. This allows us to distinguish
* between the vectors.
*/
if (vmci_dev->exclusive_vectors) {
error = request_threaded_irq(pci_irq_vector(pdev, 1), NULL,
vmci_interrupt_bm, 0,
KBUILD_MODNAME, vmci_dev);
if (error) {
dev_err(&pdev->dev,
"Failed to allocate irq %u: %d\n",
pci_irq_vector(pdev, 1), error);
goto err_free_irq;
}
if (caps_in_use & VMCI_CAPS_DMA_DATAGRAM) {
error = request_threaded_irq(pci_irq_vector(pdev, 2),
NULL,
vmci_interrupt_dma_datagram,
0, KBUILD_MODNAME,
vmci_dev);
if (error) {
dev_err(&pdev->dev,
"Failed to allocate irq %u: %d\n",
pci_irq_vector(pdev, 2), error);
goto err_free_bm_irq;
}
}
}
dev_dbg(&pdev->dev, "Registered device\n");
atomic_inc(&vmci_num_guest_devices);
/* Enable specific interrupt bits. */
cmd = VMCI_IMR_DATAGRAM;
if (caps_in_use & VMCI_CAPS_NOTIFICATIONS)
cmd |= VMCI_IMR_NOTIFICATION;
if (caps_in_use & VMCI_CAPS_DMA_DATAGRAM)
cmd |= VMCI_IMR_DMA_DATAGRAM;
vmci_write_reg(vmci_dev, cmd, VMCI_IMR_ADDR);
/* Enable interrupts. */
vmci_write_reg(vmci_dev, VMCI_CONTROL_INT_ENABLE, VMCI_CONTROL_ADDR);
pci_set_drvdata(pdev, vmci_dev);
vmci_call_vsock_callback(false);
return 0;
err_free_bm_irq:
if (vmci_dev->exclusive_vectors)
free_irq(pci_irq_vector(pdev, 1), vmci_dev);
err_free_irq:
free_irq(pci_irq_vector(pdev, 0), vmci_dev);
err_disable_msi:
pci_free_irq_vectors(pdev);
err_unsubscribe_event:
vmci_err = vmci_event_unsubscribe(ctx_update_sub_id);
if (vmci_err < VMCI_SUCCESS)
dev_warn(&pdev->dev,
"Failed to unsubscribe from event (type=%d) with subscriber (ID=0x%x): %d\n",
VMCI_EVENT_CTX_ID_UPDATE, ctx_update_sub_id, vmci_err);
err_remove_vmci_dev_g:
spin_lock_irq(&vmci_dev_spinlock);
vmci_pdev = NULL;
vmci_dev_g = NULL;
spin_unlock_irq(&vmci_dev_spinlock);
err_free_notification_bitmap:
if (vmci_dev->notification_bitmap) {
vmci_write_reg(vmci_dev, VMCI_CONTROL_RESET, VMCI_CONTROL_ADDR);
dma_free_coherent(&pdev->dev, PAGE_SIZE,
vmci_dev->notification_bitmap,
vmci_dev->notification_base);
}
err_free_data_buffers:
vmci_free_dg_buffers(vmci_dev);
/* The rest are managed resources and will be freed by PCI core */
return error;
}
static void vmci_guest_remove_device(struct pci_dev *pdev)
{
struct vmci_guest_device *vmci_dev = pci_get_drvdata(pdev);
int vmci_err;
dev_dbg(&pdev->dev, "Removing device\n");
atomic_dec(&vmci_num_guest_devices);
vmci_qp_guest_endpoints_exit();
vmci_err = vmci_event_unsubscribe(ctx_update_sub_id);
if (vmci_err < VMCI_SUCCESS)
dev_warn(&pdev->dev,
"Failed to unsubscribe from event (type=%d) with subscriber (ID=0x%x): %d\n",
VMCI_EVENT_CTX_ID_UPDATE, ctx_update_sub_id, vmci_err);
spin_lock_irq(&vmci_dev_spinlock);
vmci_dev_g = NULL;
vmci_pdev = NULL;
spin_unlock_irq(&vmci_dev_spinlock);
dev_dbg(&pdev->dev, "Resetting vmci device\n");
vmci_write_reg(vmci_dev, VMCI_CONTROL_RESET, VMCI_CONTROL_ADDR);
/*
* Free IRQ and then disable MSI/MSI-X as appropriate. For
* MSI-X, we might have multiple vectors, each with their own
* IRQ, which we must free too.
*/
if (vmci_dev->exclusive_vectors) {
free_irq(pci_irq_vector(pdev, 1), vmci_dev);
if (vmci_dev->mmio_base != NULL)
free_irq(pci_irq_vector(pdev, 2), vmci_dev);
}
free_irq(pci_irq_vector(pdev, 0), vmci_dev);
pci_free_irq_vectors(pdev);
if (vmci_dev->notification_bitmap) {
/*
* The device reset above cleared the bitmap state of the
* device, so we can safely free it here.
*/
dma_free_coherent(&pdev->dev, PAGE_SIZE,
vmci_dev->notification_bitmap,
vmci_dev->notification_base);
}
vmci_free_dg_buffers(vmci_dev);
if (vmci_dev->mmio_base != NULL)
pci_iounmap(pdev, vmci_dev->mmio_base);
/* The rest are managed resources and will be freed by PCI core */
}
static const struct pci_device_id vmci_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_VMWARE, PCI_DEVICE_ID_VMWARE_VMCI), },
{ 0 },
};
MODULE_DEVICE_TABLE(pci, vmci_ids);
static struct pci_driver vmci_guest_driver = {
.name = KBUILD_MODNAME,
.id_table = vmci_ids,
.probe = vmci_guest_probe_device,
.remove = vmci_guest_remove_device,
};
int __init vmci_guest_init(void)
{
return pci_register_driver(&vmci_guest_driver);
}
void __exit vmci_guest_exit(void)
{
pci_unregister_driver(&vmci_guest_driver);
}
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