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-rw-r--r--drivers/uio/Kconfig9
-rw-r--r--drivers/uio/Makefile1
-rw-r--r--drivers/uio/uio_hv_generic.c218
3 files changed, 228 insertions, 0 deletions
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);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 04:36:10 +0000