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1. Implement a large set of ioctl shims so that the Linux management apps from LSI will work. This includes infrastructure to support adding, deleting and rescanning arrays at runtime. This is based on work from Doug Ambrosko, heavily augmented by LSI and Yahoo. 2. Implement full 64-bit DMA support. Systems with more than 4GB of RAM can now operate without the cost of bounce buffers. Cards that cannot do 64-bit DMA will automatically revert to using bounce buffers. This option can be forced off by setting the 'hw.amr.force_sg32" tunable in the loader. It should only be turned off for debugging purposes. This work was sponsored by Yahoo. 3. Streamline the command delivery and interrupt handler paths after much discussion with Dell and LSI. The logic now closely matches the intended design, making it both more robust and much faster. Certain i/o failures under heavy load should be fixed with this. 4. Optimize the locking. In the interrupt handler, the card can be checked for completed commands without any locks held, due to the handler being implicitely serialized and there being no need to look at any shared data. Only grab the lock to return the command structure to the free pool. A small optimization can still be made to collect all of the completions together and then free them together under a single lock. Items 3 and 4 significantly increase the performance of the driver. On an LSI 320-2X card, transactions per second went from 13,000 to 31,000 in my testing with these changes. However, these changes are still fairly experimental and shouldn't be merged to 6.x until there is more testing. Thanks to Doug Ambrosko, LSI, Dell, and Yahoo for contributing towards this.
123 lines
4.6 KiB
C
123 lines
4.6 KiB
C
/*-
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* Copyright (c) 1999 Michael Smith
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Copyright (c) 2002 Eric Moore
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* Copyright (c) 2002 LSI Logic Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The party using or redistributing the source code and binary forms
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* agrees to the disclaimer below and the terms and conditions set forth
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* herein.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* $FreeBSD$
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*/
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/*
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* ioctl interface
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*/
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#include <sys/ioccom.h>
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#include <sys/param.h>
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/*
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* Fetch the driver's interface version.
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*/
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#define AMR_IO_VERSION_NUMBER 153
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#define AMR_IO_VERSION _IOR('A', 0x200, int)
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/*
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* Pass a command from userspace through to the adapter.
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*
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* Note that in order to be code-compatible with the Linux
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* interface where possible, the formatting of the au_cmd field is
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* somewhat Interesting.
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*
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* For normal commands, the layout is (fields from struct amr_mailbox_ioctl):
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*
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* 0 mb_command
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* 1 mb_channel
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* 2 mb_param
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* 3 mb_pad[0]
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* 4 mb_drive
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*
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* For SCSI passthrough commands, the layout is:
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*
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* 0 AMR_CMD_PASS (0x3)
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* 1 reserved, 0
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* 2 cdb length
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* 3 cdb data
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* 3+cdb_len passthrough control byte (timeout, ars, islogical)
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* 4+cdb_len reserved, 0
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* 5+cdb_len channel
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* 6+cdb_len target
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*/
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struct amr_user_ioctl {
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unsigned char au_cmd[32]; /* command text from userspace */
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void *au_buffer; /* data buffer in userspace */
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unsigned long au_length; /* data buffer size (0 == no data) */
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int au_direction; /* data transfer direction */
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#define AMR_IO_NODATA 0
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#define AMR_IO_READ 1
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#define AMR_IO_WRITE 2
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int au_status; /* command status returned by adapter */
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};
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#define AMR_IO_COMMAND _IOWR('A', 0x201, struct amr_user_ioctl)
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#if defined(__amd64__) || defined(__ia64__)
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struct amr_user_ioctl32 {
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unsigned char au_cmd[32]; /* command text from userspace */
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u_int32_t au_buffer; /* 32-bit pointer to uspace buf */
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u_int32_t au_length; /* length of the uspace buffer */
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int32_t au_direction; /* data transfer direction */
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int32_t au_status; /* command status returned by adapter */
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};
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# define AMR_IO_COMMAND32 _IOWR('A', 0x201, struct amr_user_ioctl32)
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#endif
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