979 lines
27 KiB
C
979 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* VMware VMCI Driver
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*
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* Copyright (C) 2012 VMware, Inc. All rights reserved.
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*/
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#include <linux/vmw_vmci_defs.h>
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#include <linux/vmw_vmci_api.h>
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#include <linux/moduleparam.h>
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#include <linux/interrupt.h>
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#include <linux/highmem.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/processor.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <linux/vmalloc.h>
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#include "vmci_datagram.h"
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#include "vmci_doorbell.h"
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#include "vmci_context.h"
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#include "vmci_driver.h"
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#include "vmci_event.h"
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#define PCI_DEVICE_ID_VMWARE_VMCI 0x0740
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#define VMCI_UTIL_NUM_RESOURCES 1
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/*
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* Datagram buffers for DMA send/receive must accommodate at least
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* a maximum sized datagram and the header.
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*/
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#define VMCI_DMA_DG_BUFFER_SIZE (VMCI_MAX_DG_SIZE + PAGE_SIZE)
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static bool vmci_disable_msi;
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module_param_named(disable_msi, vmci_disable_msi, bool, 0);
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MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
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static bool vmci_disable_msix;
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module_param_named(disable_msix, vmci_disable_msix, bool, 0);
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MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
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static u32 ctx_update_sub_id = VMCI_INVALID_ID;
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static u32 vm_context_id = VMCI_INVALID_ID;
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struct vmci_guest_device {
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struct device *dev; /* PCI device we are attached to */
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void __iomem *iobase;
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void __iomem *mmio_base;
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bool exclusive_vectors;
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struct wait_queue_head inout_wq;
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void *data_buffer;
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dma_addr_t data_buffer_base;
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void *tx_buffer;
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dma_addr_t tx_buffer_base;
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void *notification_bitmap;
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dma_addr_t notification_base;
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};
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static bool use_ppn64;
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bool vmci_use_ppn64(void)
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{
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return use_ppn64;
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}
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/* vmci_dev singleton device and supporting data*/
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struct pci_dev *vmci_pdev;
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static struct vmci_guest_device *vmci_dev_g;
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static DEFINE_SPINLOCK(vmci_dev_spinlock);
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static atomic_t vmci_num_guest_devices = ATOMIC_INIT(0);
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bool vmci_guest_code_active(void)
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{
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return atomic_read(&vmci_num_guest_devices) != 0;
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}
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u32 vmci_get_vm_context_id(void)
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{
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if (vm_context_id == VMCI_INVALID_ID) {
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struct vmci_datagram get_cid_msg;
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get_cid_msg.dst =
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vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
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VMCI_GET_CONTEXT_ID);
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get_cid_msg.src = VMCI_ANON_SRC_HANDLE;
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get_cid_msg.payload_size = 0;
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vm_context_id = vmci_send_datagram(&get_cid_msg);
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}
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return vm_context_id;
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}
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static unsigned int vmci_read_reg(struct vmci_guest_device *dev, u32 reg)
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{
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if (dev->mmio_base != NULL)
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return readl(dev->mmio_base + reg);
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return ioread32(dev->iobase + reg);
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}
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static void vmci_write_reg(struct vmci_guest_device *dev, u32 val, u32 reg)
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{
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if (dev->mmio_base != NULL)
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writel(val, dev->mmio_base + reg);
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else
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iowrite32(val, dev->iobase + reg);
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}
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static void vmci_read_data(struct vmci_guest_device *vmci_dev,
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void *dest, size_t size)
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{
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if (vmci_dev->mmio_base == NULL)
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ioread8_rep(vmci_dev->iobase + VMCI_DATA_IN_ADDR,
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dest, size);
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else {
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/*
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* For DMA datagrams, the data_buffer will contain the header on the
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* first page, followed by the incoming datagram(s) on the following
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* pages. The header uses an S/G element immediately following the
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* header on the first page to point to the data area.
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*/
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struct vmci_data_in_out_header *buffer_header = vmci_dev->data_buffer;
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struct vmci_sg_elem *sg_array = (struct vmci_sg_elem *)(buffer_header + 1);
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size_t buffer_offset = dest - vmci_dev->data_buffer;
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buffer_header->opcode = 1;
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buffer_header->size = 1;
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buffer_header->busy = 0;
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sg_array[0].addr = vmci_dev->data_buffer_base + buffer_offset;
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sg_array[0].size = size;
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vmci_write_reg(vmci_dev, lower_32_bits(vmci_dev->data_buffer_base),
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VMCI_DATA_IN_LOW_ADDR);
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wait_event(vmci_dev->inout_wq, buffer_header->busy == 1);
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}
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}
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static int vmci_write_data(struct vmci_guest_device *dev,
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struct vmci_datagram *dg)
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{
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int result;
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if (dev->mmio_base != NULL) {
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struct vmci_data_in_out_header *buffer_header = dev->tx_buffer;
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u8 *dg_out_buffer = (u8 *)(buffer_header + 1);
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if (VMCI_DG_SIZE(dg) > VMCI_MAX_DG_SIZE)
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return VMCI_ERROR_INVALID_ARGS;
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/*
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* Initialize send buffer with outgoing datagram
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* and set up header for inline data. Device will
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* not access buffer asynchronously - only after
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* the write to VMCI_DATA_OUT_LOW_ADDR.
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*/
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memcpy(dg_out_buffer, dg, VMCI_DG_SIZE(dg));
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buffer_header->opcode = 0;
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buffer_header->size = VMCI_DG_SIZE(dg);
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buffer_header->busy = 1;
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vmci_write_reg(dev, lower_32_bits(dev->tx_buffer_base),
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VMCI_DATA_OUT_LOW_ADDR);
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/* Caller holds a spinlock, so cannot block. */
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spin_until_cond(buffer_header->busy == 0);
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result = vmci_read_reg(vmci_dev_g, VMCI_RESULT_LOW_ADDR);
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if (result == VMCI_SUCCESS)
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result = (int)buffer_header->result;
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} else {
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iowrite8_rep(dev->iobase + VMCI_DATA_OUT_ADDR,
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dg, VMCI_DG_SIZE(dg));
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result = vmci_read_reg(vmci_dev_g, VMCI_RESULT_LOW_ADDR);
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}
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return result;
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}
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/*
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* VM to hypervisor call mechanism. We use the standard VMware naming
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* convention since shared code is calling this function as well.
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*/
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int vmci_send_datagram(struct vmci_datagram *dg)
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{
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unsigned long flags;
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int result;
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/* Check args. */
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if (dg == NULL)
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return VMCI_ERROR_INVALID_ARGS;
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/*
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* Need to acquire spinlock on the device because the datagram
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* data may be spread over multiple pages and the monitor may
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* interleave device user rpc calls from multiple
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* VCPUs. Acquiring the spinlock precludes that
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* possibility. Disabling interrupts to avoid incoming
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* datagrams during a "rep out" and possibly landing up in
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* this function.
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*/
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spin_lock_irqsave(&vmci_dev_spinlock, flags);
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if (vmci_dev_g) {
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vmci_write_data(vmci_dev_g, dg);
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result = vmci_read_reg(vmci_dev_g, VMCI_RESULT_LOW_ADDR);
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} else {
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result = VMCI_ERROR_UNAVAILABLE;
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}
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spin_unlock_irqrestore(&vmci_dev_spinlock, flags);
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return result;
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}
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EXPORT_SYMBOL_GPL(vmci_send_datagram);
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/*
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* Gets called with the new context id if updated or resumed.
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* Context id.
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*/
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static void vmci_guest_cid_update(u32 sub_id,
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const struct vmci_event_data *event_data,
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void *client_data)
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{
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const struct vmci_event_payld_ctx *ev_payload =
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vmci_event_data_const_payload(event_data);
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if (sub_id != ctx_update_sub_id) {
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pr_devel("Invalid subscriber (ID=0x%x)\n", sub_id);
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return;
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}
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if (!event_data || ev_payload->context_id == VMCI_INVALID_ID) {
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pr_devel("Invalid event data\n");
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return;
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}
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pr_devel("Updating context from (ID=0x%x) to (ID=0x%x) on event (type=%d)\n",
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vm_context_id, ev_payload->context_id, event_data->event);
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vm_context_id = ev_payload->context_id;
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}
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/*
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* Verify that the host supports the hypercalls we need. If it does not,
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* try to find fallback hypercalls and use those instead. Returns 0 if
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* required hypercalls (or fallback hypercalls) are supported by the host,
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* an error code otherwise.
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*/
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static int vmci_check_host_caps(struct pci_dev *pdev)
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{
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bool result;
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struct vmci_resource_query_msg *msg;
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u32 msg_size = sizeof(struct vmci_resource_query_hdr) +
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VMCI_UTIL_NUM_RESOURCES * sizeof(u32);
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struct vmci_datagram *check_msg;
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check_msg = kzalloc(msg_size, GFP_KERNEL);
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if (!check_msg) {
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dev_err(&pdev->dev, "%s: Insufficient memory\n", __func__);
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return -ENOMEM;
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}
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check_msg->dst = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
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VMCI_RESOURCES_QUERY);
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check_msg->src = VMCI_ANON_SRC_HANDLE;
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check_msg->payload_size = msg_size - VMCI_DG_HEADERSIZE;
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msg = (struct vmci_resource_query_msg *)VMCI_DG_PAYLOAD(check_msg);
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msg->num_resources = VMCI_UTIL_NUM_RESOURCES;
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msg->resources[0] = VMCI_GET_CONTEXT_ID;
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/* Checks that hyper calls are supported */
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result = vmci_send_datagram(check_msg) == 0x01;
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kfree(check_msg);
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dev_dbg(&pdev->dev, "%s: Host capability check: %s\n",
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__func__, result ? "PASSED" : "FAILED");
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/* We need the vector. There are no fallbacks. */
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return result ? 0 : -ENXIO;
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}
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/*
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* Reads datagrams from the device and dispatches them. For IO port
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* based access to the device, we always start reading datagrams into
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* only the first page of the datagram buffer. If the datagrams don't
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* fit into one page, we use the maximum datagram buffer size for the
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* remainder of the invocation. This is a simple heuristic for not
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* penalizing small datagrams. For DMA-based datagrams, we always
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* use the maximum datagram buffer size, since there is no performance
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* penalty for doing so.
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*
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* This function assumes that it has exclusive access to the data
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* in register(s) for the duration of the call.
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*/
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static void vmci_dispatch_dgs(struct vmci_guest_device *vmci_dev)
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{
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u8 *dg_in_buffer = vmci_dev->data_buffer;
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struct vmci_datagram *dg;
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size_t dg_in_buffer_size = VMCI_MAX_DG_SIZE;
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size_t current_dg_in_buffer_size;
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size_t remaining_bytes;
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bool is_io_port = vmci_dev->mmio_base == NULL;
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BUILD_BUG_ON(VMCI_MAX_DG_SIZE < PAGE_SIZE);
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if (!is_io_port) {
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/* For mmio, the first page is used for the header. */
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dg_in_buffer += PAGE_SIZE;
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/*
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* For DMA-based datagram operations, there is no performance
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* penalty for reading the maximum buffer size.
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*/
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current_dg_in_buffer_size = VMCI_MAX_DG_SIZE;
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} else {
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current_dg_in_buffer_size = PAGE_SIZE;
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}
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vmci_read_data(vmci_dev, dg_in_buffer, current_dg_in_buffer_size);
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dg = (struct vmci_datagram *)dg_in_buffer;
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remaining_bytes = current_dg_in_buffer_size;
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/*
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* Read through the buffer until an invalid datagram header is
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* encountered. The exit condition for datagrams read through
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* VMCI_DATA_IN_ADDR is a bit more complicated, since a datagram
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* can start on any page boundary in the buffer.
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*/
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while (dg->dst.resource != VMCI_INVALID_ID ||
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(is_io_port && remaining_bytes > PAGE_SIZE)) {
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unsigned dg_in_size;
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/*
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* If using VMCI_DATA_IN_ADDR, skip to the next page
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* as a datagram can start on any page boundary.
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*/
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if (dg->dst.resource == VMCI_INVALID_ID) {
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dg = (struct vmci_datagram *)roundup(
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(uintptr_t)dg + 1, PAGE_SIZE);
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remaining_bytes =
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(size_t)(dg_in_buffer +
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current_dg_in_buffer_size -
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(u8 *)dg);
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continue;
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}
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dg_in_size = VMCI_DG_SIZE_ALIGNED(dg);
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if (dg_in_size <= dg_in_buffer_size) {
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int result;
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/*
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* If the remaining bytes in the datagram
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* buffer doesn't contain the complete
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* datagram, we first make sure we have enough
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* room for it and then we read the reminder
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* of the datagram and possibly any following
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* datagrams.
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*/
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if (dg_in_size > remaining_bytes) {
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if (remaining_bytes !=
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current_dg_in_buffer_size) {
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/*
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* We move the partial
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* datagram to the front and
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* read the reminder of the
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* datagram and possibly
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* following calls into the
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* following bytes.
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*/
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memmove(dg_in_buffer, dg_in_buffer +
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current_dg_in_buffer_size -
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remaining_bytes,
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remaining_bytes);
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dg = (struct vmci_datagram *)
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dg_in_buffer;
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}
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if (current_dg_in_buffer_size !=
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dg_in_buffer_size)
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current_dg_in_buffer_size =
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dg_in_buffer_size;
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vmci_read_data(vmci_dev,
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dg_in_buffer +
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remaining_bytes,
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current_dg_in_buffer_size -
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remaining_bytes);
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}
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/*
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* We special case event datagrams from the
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* hypervisor.
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*/
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if (dg->src.context == VMCI_HYPERVISOR_CONTEXT_ID &&
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dg->dst.resource == VMCI_EVENT_HANDLER) {
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result = vmci_event_dispatch(dg);
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} else {
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result = vmci_datagram_invoke_guest_handler(dg);
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}
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if (result < VMCI_SUCCESS)
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dev_dbg(vmci_dev->dev,
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"Datagram with resource (ID=0x%x) failed (err=%d)\n",
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dg->dst.resource, result);
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/* On to the next datagram. */
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dg = (struct vmci_datagram *)((u8 *)dg +
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dg_in_size);
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} else {
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size_t bytes_to_skip;
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/*
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* Datagram doesn't fit in datagram buffer of maximal
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* size. We drop it.
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*/
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dev_dbg(vmci_dev->dev,
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"Failed to receive datagram (size=%u bytes)\n",
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dg_in_size);
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bytes_to_skip = dg_in_size - remaining_bytes;
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if (current_dg_in_buffer_size != dg_in_buffer_size)
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current_dg_in_buffer_size = dg_in_buffer_size;
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for (;;) {
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vmci_read_data(vmci_dev, dg_in_buffer,
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current_dg_in_buffer_size);
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if (bytes_to_skip <= current_dg_in_buffer_size)
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break;
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bytes_to_skip -= current_dg_in_buffer_size;
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}
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dg = (struct vmci_datagram *)(dg_in_buffer +
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bytes_to_skip);
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}
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remaining_bytes =
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(size_t) (dg_in_buffer + current_dg_in_buffer_size -
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(u8 *)dg);
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if (remaining_bytes < VMCI_DG_HEADERSIZE) {
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/* Get the next batch of datagrams. */
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vmci_read_data(vmci_dev, dg_in_buffer,
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current_dg_in_buffer_size);
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dg = (struct vmci_datagram *)dg_in_buffer;
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remaining_bytes = current_dg_in_buffer_size;
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}
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}
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}
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/*
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* Scans the notification bitmap for raised flags, clears them
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* and handles the notifications.
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*/
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static void vmci_process_bitmap(struct vmci_guest_device *dev)
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{
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if (!dev->notification_bitmap) {
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dev_dbg(dev->dev, "No bitmap present in %s\n", __func__);
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return;
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}
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vmci_dbell_scan_notification_entries(dev->notification_bitmap);
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}
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/*
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* Interrupt handler for legacy or MSI interrupt, or for first MSI-X
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* interrupt (vector VMCI_INTR_DATAGRAM).
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*/
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static irqreturn_t vmci_interrupt(int irq, void *_dev)
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{
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struct vmci_guest_device *dev = _dev;
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/*
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* If we are using MSI-X with exclusive vectors then we simply call
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* vmci_dispatch_dgs(), since we know the interrupt was meant for us.
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* Otherwise we must read the ICR to determine what to do.
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*/
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if (dev->exclusive_vectors) {
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vmci_dispatch_dgs(dev);
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} else {
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unsigned int icr;
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/* 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_MSIX | PCI_IRQ_MSI | PCI_IRQ_LEGACY);
|
|
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);
|
|
}
|