uio-hv-generic: new userspace i/o driver for VMBus

This is a new driver to enable userspace networking on VMBus.
It is based largely on the similar driver that already exists
for PCI, and earlier work done by Brocade to support DPDK.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

5 files changed, 230 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index b0fee8c45135..d19faf724ac6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5852,6 +5852,7 @@ F:	drivers/input/serio/hyperv-keyboard.c
 F:      drivers/pci/host/pci-hyperv.c
 F:      drivers/net/hyperv/
 F:      drivers/scsi/storvsc_drv.c
+F:      drivers/uio/uio_hv_generic.c
 F:      drivers/video/fbdev/hyperv_fb.c
 F:      include/linux/hyperv.h
 F:      tools/hv/
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 78e6368a4423..6ce8b874e833 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -39,6 +39,7 @@ struct vmbus_connection vmbus_connection = {
         .conn_state             = DISCONNECTED,
         .next_gpadl_handle      = ATOMIC_INIT(0xE1E10),
 };
+EXPORT_SYMBOL_GPL(vmbus_connection);
 
 /*
  * Negotiated protocol version with the host.
diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
index 52c98ce1b6fe..7e8dc78a9796 100644
--- a/drivers/uio/Kconfig
+++ b/drivers/uio/Kconfig
@@ -155,4 +155,13 @@ config UIO_MF624
 
           If you compile this as a module, it will be called uio_mf624.
 
+config UIO_HV_GENERIC
+        tristate "Generic driver for Hyper-V VMBus"
+        depends on HYPERV
+        help
+          Generic driver that you can bind, dynamically, to any
+          Hyper-V VMBus device. It is useful to provide direct access
+          to network and storage devices from userspace.
+
+          If you compile this as a module, it will be called uio_hv_generic.
 endif
diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile
index 8560dad52d0f..e9663bb8a4c7 100644
--- a/drivers/uio/Makefile
+++ b/drivers/uio/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_UIO_NETX)	+= uio_netx.o
 obj-$(CONFIG_UIO_PRUSS)         += uio_pruss.o
 obj-$(CONFIG_UIO_MF624)         += uio_mf624.o
 obj-$(CONFIG_UIO_FSL_ELBC_GPCM) += uio_fsl_elbc_gpcm.o
+obj-$(CONFIG_UIO_HV_GENERIC)    += uio_hv_generic.o
diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
new file mode 100644
index 000000000000..ad3ab5805ad8
--- /dev/null
+++ b/drivers/uio/uio_hv_generic.c
@@ -0,0 +1,218 @@
+/*
+ * uio_hv_generic - generic UIO driver for VMBus
+ *
+ * Copyright (c) 2013-2016 Brocade Communications Systems, Inc.
+ * Copyright (c) 2016, Microsoft Corporation.
+ *
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ *
+ * Since the driver does not declare any device ids, you must allocate
+ * id and bind the device to the driver yourself.  For example:
+ *
+ * # echo "f8615163-df3e-46c5-913f-f2d2f965ed0e" \
+ *    > /sys/bus/vmbus/drivers/uio_hv_generic
+ * # echo -n vmbus-ed963694-e847-4b2a-85af-bc9cfc11d6f3 \
+ *    > /sys/bus/vmbus/drivers/hv_netvsc/unbind
+ * # echo -n vmbus-ed963694-e847-4b2a-85af-bc9cfc11d6f3 \
+ *    > /sys/bus/vmbus/drivers/uio_hv_generic/bind
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/uio_driver.h>
+#include <linux/netdevice.h>
+#include <linux/if_ether.h>
+#include <linux/skbuff.h>
+#include <linux/hyperv.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+
+#include "../hv/hyperv_vmbus.h"
+
+#define DRIVER_VERSION  "0.02.0"
+#define DRIVER_AUTHOR   "Stephen Hemminger <sthemmin at microsoft.com>"
+#define DRIVER_DESC     "Generic UIO driver for VMBus devices"
+
+/*
+ * List of resources to be mapped to user space
+ * can be extended up to MAX_UIO_MAPS(5) items
+ */
+enum hv_uio_map {
+        TXRX_RING_MAP = 0,
+        INT_PAGE_MAP,
+        MON_PAGE_MAP,
+};
+
+#define HV_RING_SIZE    512
+
+struct hv_uio_private_data {
+        struct uio_info info;
+        struct hv_device *device;
+};
+
+static int
+hv_uio_mmap(struct uio_info *info, struct vm_area_struct *vma)
+{
+        int mi;
+
+        if (vma->vm_pgoff >= MAX_UIO_MAPS)
+                return -EINVAL;
+
+        if (info->mem[vma->vm_pgoff].size == 0)
+                return -EINVAL;
+
+        mi = (int)vma->vm_pgoff;
+
+        return remap_pfn_range(vma, vma->vm_start,
+                        virt_to_phys((void *)info->mem[mi].addr) >> PAGE_SHIFT,
+                        vma->vm_end - vma->vm_start, vma->vm_page_prot);
+}
+
+/*
+ * This is the irqcontrol callback to be registered to uio_info.
+ * It can be used to disable/enable interrupt from user space processes.
+ *
+ * @param info
+ *  pointer to uio_info.
+ * @param irq_state
+ *  state value. 1 to enable interrupt, 0 to disable interrupt.
+ */
+static int
+hv_uio_irqcontrol(struct uio_info *info, s32 irq_state)
+{
+        struct hv_uio_private_data *pdata = info->priv;
+        struct hv_device *dev = pdata->device;
+
+        dev->channel->inbound.ring_buffer->interrupt_mask = !irq_state;
+        virt_mb();
+
+        return 0;
+}
+
+/*
+ * Callback from vmbus_event when something is in inbound ring.
+ */
+static void hv_uio_channel_cb(void *context)
+{
+        struct hv_uio_private_data *pdata = context;
+        struct hv_device *dev = pdata->device;
+
+        dev->channel->inbound.ring_buffer->interrupt_mask = 1;
+        virt_mb();
+
+        uio_event_notify(&pdata->info);
+}
+
+static int
+hv_uio_probe(struct hv_device *dev,
+             const struct hv_vmbus_device_id *dev_id)
+{
+        struct hv_uio_private_data *pdata;
+        int ret;
+
+        pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return -ENOMEM;
+
+        ret = vmbus_open(dev->channel, HV_RING_SIZE * PAGE_SIZE,
+                         HV_RING_SIZE * PAGE_SIZE, NULL, 0,
+                         hv_uio_channel_cb, pdata);
+        if (ret)
+                goto fail;
+
+        dev->channel->inbound.ring_buffer->interrupt_mask = 1;
+        dev->channel->batched_reading = false;
+
+        /* Fill general uio info */
+        pdata->info.name = "uio_hv_generic";
+        pdata->info.version = DRIVER_VERSION;
+        pdata->info.irqcontrol = hv_uio_irqcontrol;
+        pdata->info.mmap = hv_uio_mmap;
+        pdata->info.irq = UIO_IRQ_CUSTOM;
+
+        /* mem resources */
+        pdata->info.mem[TXRX_RING_MAP].name = "txrx_rings";
+        pdata->info.mem[TXRX_RING_MAP].addr
+                = (phys_addr_t)dev->channel->ringbuffer_pages;
+        pdata->info.mem[TXRX_RING_MAP].size
+                = dev->channel->ringbuffer_pagecount * PAGE_SIZE;
+        pdata->info.mem[TXRX_RING_MAP].memtype = UIO_MEM_LOGICAL;
+
+        pdata->info.mem[INT_PAGE_MAP].name = "int_page";
+        pdata->info.mem[INT_PAGE_MAP].addr =
+                (phys_addr_t)vmbus_connection.int_page;
+        pdata->info.mem[INT_PAGE_MAP].size = PAGE_SIZE;
+        pdata->info.mem[INT_PAGE_MAP].memtype = UIO_MEM_LOGICAL;
+
+        pdata->info.mem[MON_PAGE_MAP].name = "monitor_pages";
+        pdata->info.mem[MON_PAGE_MAP].addr =
+                (phys_addr_t)vmbus_connection.monitor_pages[1];
+        pdata->info.mem[MON_PAGE_MAP].size = PAGE_SIZE;
+        pdata->info.mem[MON_PAGE_MAP].memtype = UIO_MEM_LOGICAL;
+
+        pdata->info.priv = pdata;
+        pdata->device = dev;
+
+        ret = uio_register_device(&dev->device, &pdata->info);
+        if (ret) {
+                dev_err(&dev->device, "hv_uio register failed\n");
+                goto fail_close;
+        }
+
+        hv_set_drvdata(dev, pdata);
+
+        return 0;
+
+fail_close:
+        vmbus_close(dev->channel);
+fail:
+        kfree(pdata);
+
+        return ret;
+}
+
+static int
+hv_uio_remove(struct hv_device *dev)
+{
+        struct hv_uio_private_data *pdata = hv_get_drvdata(dev);
+
+        if (!pdata)
+                return 0;
+
+        uio_unregister_device(&pdata->info);
+        hv_set_drvdata(dev, NULL);
+        vmbus_close(dev->channel);
+        kfree(pdata);
+        return 0;
+}
+
+static struct hv_driver hv_uio_drv = {
+        .name = "uio_hv_generic",
+        .id_table = NULL, /* only dynamic id's */
+        .probe = hv_uio_probe,
+        .remove = hv_uio_remove,
+};
+
+static int __init
+hyperv_module_init(void)
+{
+        return vmbus_driver_register(&hv_uio_drv);
+}
+
+static void __exit
+hyperv_module_exit(void)
+{
+        vmbus_driver_unregister(&hv_uio_drv);
+}
+
+module_init(hyperv_module_init);
+module_exit(hyperv_module_exit);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);