SCSI: Fix SCSI ioctls for virtual storage driver

Virtualized Storage driver expects data buffer to be cache aligned as its
used by DMA engine for transfer. Driver allocates cache aligned buffer but
data len is not cache aligned since data_len depends on ioctl.  So add
field to pass data_buf_len separately which is cache aligned.  Change VSC
server to use this field for cache operations for IOCTLs.

Bug 200588819

Change-Id: Ib6b40a06582bd7fe6f60dee854096a42db4d08b2
Signed-off-by: Hardik Tushar Shah <hardikts@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2299239
Reviewed-by: Dmitry Pervushin <dpervushin@nvidia.com>
Reviewed-by: Phoenix Jung <pjung@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/tegra_virt_storage_spec.h b/include/tegra_virt_storage_spec.h
index d476d5463..ef5c2bb97 100644
--- a/include/tegra_virt_storage_spec.h
+++ b/include/tegra_virt_storage_spec.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2018-2020, NVIDIA CORPORATION.  All rights reserved.
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
@@ -233,6 +233,7 @@ struct vblk_sg_io_hdr
     uint32_t sbp_arg_offset;    /* [i], [*o] offset to sense_buffer memory */
     uint32_t status;            /* [o] scsi status */
     uint8_t sb_len_wr;          /* [o] byte count actually written to sbp */
+    uint32_t dxfer_buf_len;     /* [i] Length of data transfer buffer */
 };
 
 #pragma pack(pop)