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path: root/drivers/uio/uio_hv_generic.c
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Diffstat (limited to 'drivers/uio/uio_hv_generic.c')
-rw-r--r--drivers/uio/uio_hv_generic.c138
1 files changed, 107 insertions, 31 deletions
diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index 48d5327d38d4..8ca549032c27 100644
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -10,11 +10,13 @@
* Since the driver does not declare any device ids, you must allocate
* id and bind the device to the driver yourself. For example:
*
+ * Associate Network GUID with UIO device
* # 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/uio_hv_generic/new_id
+ * Then rebind
+ * # echo -n "ed963694-e847-4b2a-85af-bc9cfc11d6f3" \
* > /sys/bus/vmbus/drivers/hv_netvsc/unbind
- * # echo -n vmbus-ed963694-e847-4b2a-85af-bc9cfc11d6f3 \
+ * # echo -n "ed963694-e847-4b2a-85af-bc9cfc11d6f3" \
* > /sys/bus/vmbus/drivers/uio_hv_generic/bind
*/
@@ -37,6 +39,10 @@
#define DRIVER_AUTHOR "Stephen Hemminger <sthemmin at microsoft.com>"
#define DRIVER_DESC "Generic UIO driver for VMBus devices"
+#define HV_RING_SIZE 512 /* pages */
+#define SEND_BUFFER_SIZE (15 * 1024 * 1024)
+#define RECV_BUFFER_SIZE (15 * 1024 * 1024)
+
/*
* List of resources to be mapped to user space
* can be extended up to MAX_UIO_MAPS(5) items
@@ -45,32 +51,22 @@ enum hv_uio_map {
TXRX_RING_MAP = 0,
INT_PAGE_MAP,
MON_PAGE_MAP,
+ RECV_BUF_MAP,
+ SEND_BUF_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;
+ void *recv_buf;
+ u32 recv_gpadl;
+ char recv_name[32]; /* "recv_4294967295" */
- if (info->mem[vma->vm_pgoff].size == 0)
- return -EINVAL;
-
- mi = (int)vma->vm_pgoff;
-
- return remap_pfn_range(vma, vma->vm_start,
- info->mem[mi].addr >> PAGE_SHIFT,
- vma->vm_end - vma->vm_start, vma->vm_page_prot);
-}
+ void *send_buf;
+ u32 send_gpadl;
+ char send_name[32];
+};
/*
* This is the irqcontrol callback to be registered to uio_info.
@@ -107,6 +103,36 @@ static void hv_uio_channel_cb(void *context)
uio_event_notify(&pdata->info);
}
+/*
+ * Callback from vmbus_event when channel is rescinded.
+ */
+static void hv_uio_rescind(struct vmbus_channel *channel)
+{
+ struct hv_device *hv_dev = channel->primary_channel->device_obj;
+ struct hv_uio_private_data *pdata = hv_get_drvdata(hv_dev);
+
+ /*
+ * Turn off the interrupt file handle
+ * Next read for event will return -EIO
+ */
+ pdata->info.irq = 0;
+
+ /* Wake up reader */
+ uio_event_notify(&pdata->info);
+}
+
+static void
+hv_uio_cleanup(struct hv_device *dev, struct hv_uio_private_data *pdata)
+{
+ if (pdata->send_gpadl)
+ vmbus_teardown_gpadl(dev->channel, pdata->send_gpadl);
+ vfree(pdata->send_buf);
+
+ if (pdata->recv_gpadl)
+ vmbus_teardown_gpadl(dev->channel, pdata->recv_gpadl);
+ vfree(pdata->recv_buf);
+}
+
static int
hv_uio_probe(struct hv_device *dev,
const struct hv_vmbus_device_id *dev_id)
@@ -124,36 +150,82 @@ hv_uio_probe(struct hv_device *dev,
if (ret)
goto fail;
+ /* Communicating with host has to be via shared memory not hypercall */
+ if (!dev->channel->offermsg.monitor_allocated) {
+ dev_err(&dev->device, "vmbus channel requires hypercall\n");
+ ret = -ENOTSUPP;
+ goto fail_close;
+ }
+
dev->channel->inbound.ring_buffer->interrupt_mask = 1;
- set_channel_read_mode(dev->channel, HV_CALL_DIRECT);
+ set_channel_read_mode(dev->channel, HV_CALL_ISR);
/* 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
- = virt_to_phys(dev->channel->ringbuffer_pages);
+ = (uintptr_t)dev->channel->ringbuffer_pages;
pdata->info.mem[TXRX_RING_MAP].size
- = dev->channel->ringbuffer_pagecount * PAGE_SIZE;
+ = dev->channel->ringbuffer_pagecount << PAGE_SHIFT;
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 =
- virt_to_phys(vmbus_connection.int_page);
+ pdata->info.mem[INT_PAGE_MAP].addr
+ = (uintptr_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 =
- virt_to_phys(vmbus_connection.monitor_pages[1]);
+ pdata->info.mem[MON_PAGE_MAP].name = "monitor_page";
+ pdata->info.mem[MON_PAGE_MAP].addr
+ = (uintptr_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->recv_buf = vzalloc(RECV_BUFFER_SIZE);
+ if (pdata->recv_buf == NULL) {
+ ret = -ENOMEM;
+ goto fail_close;
+ }
+
+ ret = vmbus_establish_gpadl(dev->channel, pdata->recv_buf,
+ RECV_BUFFER_SIZE, &pdata->recv_gpadl);
+ if (ret)
+ goto fail_close;
+
+ /* put Global Physical Address Label in name */
+ snprintf(pdata->recv_name, sizeof(pdata->recv_name),
+ "recv:%u", pdata->recv_gpadl);
+ pdata->info.mem[RECV_BUF_MAP].name = pdata->recv_name;
+ pdata->info.mem[RECV_BUF_MAP].addr
+ = (uintptr_t)pdata->recv_buf;
+ pdata->info.mem[RECV_BUF_MAP].size = RECV_BUFFER_SIZE;
+ pdata->info.mem[RECV_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
+
+
+ pdata->send_buf = vzalloc(SEND_BUFFER_SIZE);
+ if (pdata->send_buf == NULL) {
+ ret = -ENOMEM;
+ goto fail_close;
+ }
+
+ ret = vmbus_establish_gpadl(dev->channel, pdata->send_buf,
+ SEND_BUFFER_SIZE, &pdata->send_gpadl);
+ if (ret)
+ goto fail_close;
+
+ snprintf(pdata->send_name, sizeof(pdata->send_name),
+ "send:%u", pdata->send_gpadl);
+ pdata->info.mem[SEND_BUF_MAP].name = pdata->send_name;
+ pdata->info.mem[SEND_BUF_MAP].addr
+ = (uintptr_t)pdata->send_buf;
+ pdata->info.mem[SEND_BUF_MAP].size = SEND_BUFFER_SIZE;
+ pdata->info.mem[SEND_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
+
pdata->info.priv = pdata;
pdata->device = dev;
@@ -163,11 +235,14 @@ hv_uio_probe(struct hv_device *dev,
goto fail_close;
}
+ vmbus_set_chn_rescind_callback(dev->channel, hv_uio_rescind);
+
hv_set_drvdata(dev, pdata);
return 0;
fail_close:
+ hv_uio_cleanup(dev, pdata);
vmbus_close(dev->channel);
fail:
kfree(pdata);
@@ -184,6 +259,7 @@ hv_uio_remove(struct hv_device *dev)
return 0;
uio_unregister_device(&pdata->info);
+ hv_uio_cleanup(dev, pdata);
hv_set_drvdata(dev, NULL);
vmbus_close(dev->channel);
kfree(pdata);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 14:23:37 +0100