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/*
* VMware VMCI Driver
*
* Copyright (C) 2012 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 and no later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#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/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
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;
bool exclusive_vectors;
struct tasklet_struct datagram_tasklet;
struct tasklet_struct bm_tasklet;
void *data_buffer;
void *notification_bitmap;
dma_addr_t notification_base;
};
/* 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;
}
/*
* 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) {
iowrite8_rep(vmci_dev_g->iobase + VMCI_DATA_OUT_ADDR,
dg, VMCI_DG_SIZE(dg));
result = ioread32(vmci_dev_g->iobase + 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
* true if required hypercalls (or fallback hypercalls) are
* supported by the host, false 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 = kmalloc(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 data in port and dispatches them. 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.
*
* This function assumes that it has exclusive access to the data
* in port for the duration of the call.
*/
static void vmci_dispatch_dgs(unsigned long data)
{
struct vmci_guest_device *vmci_dev = (struct vmci_guest_device *)data;
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 = PAGE_SIZE;
size_t remaining_bytes;
BUILD_BUG_ON(VMCI_MAX_DG_SIZE < PAGE_SIZE);
ioread8_rep(vmci_dev->iobase + VMCI_DATA_IN_ADDR,
vmci_dev->data_buffer, current_dg_in_buffer_size);
dg = (struct vmci_datagram *)dg_in_buffer;
remaining_bytes = current_dg_in_buffer_size;
while (dg->dst.resource != VMCI_INVALID_ID ||
remaining_bytes > PAGE_SIZE) {
unsigned dg_in_size;
/*
* When the input buffer spans multiple pages, a datagram can
* start on any page boundary in the buffer.
*/
if (dg->dst.resource == VMCI_INVALID_ID) {
dg = (struct vmci_datagram *)
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