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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-02-01 10:31:17 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-02-01 10:31:17 -0800 |
commit | f6cff79f1d122f78a4b35bf4b2f0112afcd89ea4 (patch) | |
tree | cf3a38576f9adbb3860982c25f72aebed2bb541a /drivers/uio | |
parent | 47fcc0360cfb3fe82e4daddacad3c1cd80b0b75d (diff) | |
parent | 9ff6576e124b1227c27c1da43fe5f8ee908263e0 (diff) | |
download | linux-stable-f6cff79f1d122f78a4b35bf4b2f0112afcd89ea4.tar.gz linux-stable-f6cff79f1d122f78a4b35bf4b2f0112afcd89ea4.tar.bz2 linux-stable-f6cff79f1d122f78a4b35bf4b2f0112afcd89ea4.zip |
Merge tag 'char-misc-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver updates from Greg KH:
"Here is the big pull request for char/misc drivers for 4.16-rc1.
There's a lot of stuff in here. Three new driver subsystems were added
for various types of hardware busses:
- siox
- slimbus
- soundwire
as well as a new vboxguest subsystem for the VirtualBox hypervisor
drivers.
There's also big updates from the FPGA subsystem, lots of Android
binder fixes, the usual handful of hyper-v updates, and lots of other
smaller driver updates.
All of these have been in linux-next for a long time, with no reported
issues"
* tag 'char-misc-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (155 commits)
char: lp: use true or false for boolean values
android: binder: use VM_ALLOC to get vm area
android: binder: Use true and false for boolean values
lkdtm: fix handle_irq_event symbol for INT_HW_IRQ_EN
EISA: Delete error message for a failed memory allocation in eisa_probe()
EISA: Whitespace cleanup
misc: remove AVR32 dependencies
virt: vbox: Add error mapping for VERR_INVALID_NAME and VERR_NO_MORE_FILES
soundwire: Fix a signedness bug
uio_hv_generic: fix new type mismatch warnings
uio_hv_generic: fix type mismatch warnings
auxdisplay: img-ascii-lcd: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE
uio_hv_generic: add rescind support
uio_hv_generic: check that host supports monitor page
uio_hv_generic: create send and receive buffers
uio: document uio_hv_generic regions
doc: fix documentation about uio_hv_generic
vmbus: add monitor_id and subchannel_id to sysfs per channel
vmbus: fix ABI documentation
uio_hv_generic: use ISR callback method
...
Diffstat (limited to 'drivers/uio')
-rw-r--r-- | drivers/uio/uio_hv_generic.c | 138 |
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); |