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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 19:54:53 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 20:01:40 (GMT) |
commit | ae19ffbadc1b2100285a5b5b3d0a4e0a11390904 (patch) | |
tree | 3c2086ab67398a019089a47ca3f362a4bc6db74f /drivers/staging/hv/BlkVsc.c | |
parent | 34e84f39a27d059a3e6ec6e8b94aafa702e6f220 (diff) | |
parent | 9173a8ef24a6b1b8031507b35b8ffe5f85a87692 (diff) | |
download | linux-fsl-qoriq-ae19ffbadc1b2100285a5b5b3d0a4e0a11390904.tar.xz |
Merge branch 'master' into for-linus
Diffstat (limited to 'drivers/staging/hv/BlkVsc.c')
-rw-r--r-- | drivers/staging/hv/BlkVsc.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/staging/hv/BlkVsc.c b/drivers/staging/hv/BlkVsc.c new file mode 100644 index 0000000..51aa861 --- /dev/null +++ b/drivers/staging/hv/BlkVsc.c @@ -0,0 +1,111 @@ +/* + * + * Copyright (c) 2009, Microsoft Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Authors: + * Hank Janssen <hjanssen@microsoft.com> + * + */ +#include <linux/kernel.h> +#include <linux/mm.h> +#include "osd.h" +#include "StorVsc.c" + +static const char *gBlkDriverName = "blkvsc"; + +/* {32412632-86cb-44a2-9b5c-50d1417354f5} */ +static const struct hv_guid gBlkVscDeviceType = { + .data = { + 0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, + 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5 + } +}; + +static int BlkVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo) +{ + struct storvsc_device_info *deviceInfo; + int ret = 0; + + DPRINT_ENTER(BLKVSC); + + deviceInfo = (struct storvsc_device_info *)AdditionalInfo; + + ret = StorVscOnDeviceAdd(Device, AdditionalInfo); + if (ret != 0) { + DPRINT_EXIT(BLKVSC); + return ret; + } + + /* + * We need to use the device instance guid to set the path and target + * id. For IDE devices, the device instance id is formatted as + * <bus id> * - <device id> - 8899 - 000000000000. + */ + deviceInfo->PathId = Device->deviceInstance.data[3] << 24 | + Device->deviceInstance.data[2] << 16 | + Device->deviceInstance.data[1] << 8 | + Device->deviceInstance.data[0]; + + deviceInfo->TargetId = Device->deviceInstance.data[5] << 8 | + Device->deviceInstance.data[4]; + + DPRINT_EXIT(BLKVSC); + + return ret; +} + +int BlkVscInitialize(struct hv_driver *Driver) +{ + struct storvsc_driver_object *storDriver; + int ret = 0; + + DPRINT_ENTER(BLKVSC); + + storDriver = (struct storvsc_driver_object *)Driver; + + /* Make sure we are at least 2 pages since 1 page is used for control */ + ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1)); + + Driver->name = gBlkDriverName; + memcpy(&Driver->deviceType, &gBlkVscDeviceType, sizeof(struct hv_guid)); + + storDriver->RequestExtSize = sizeof(struct storvsc_request_extension); + + /* + * Divide the ring buffer data size (which is 1 page less than the ring + * buffer size since that page is reserved for the ring buffer indices) + * by the max request size (which is + * VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + struct vstor_packet + u64) + */ + storDriver->MaxOutstandingRequestsPerChannel = + ((storDriver->RingBufferSize - PAGE_SIZE) / + ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET + + sizeof(struct vstor_packet) + sizeof(u64), + sizeof(u64))); + + DPRINT_INFO(BLKVSC, "max io outstd %u", + storDriver->MaxOutstandingRequestsPerChannel); + + /* Setup the dispatch table */ + storDriver->Base.OnDeviceAdd = BlkVscOnDeviceAdd; + storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove; + storDriver->Base.OnCleanup = StorVscOnCleanup; + storDriver->OnIORequest = StorVscOnIORequest; + + DPRINT_EXIT(BLKVSC); + + return ret; +} |