Implement SCB paging which allows up to 255 active commands on aic7770
(Rev E or greater), aic7850, aic7860, aic7870, and aic7880 controllers. SCB paging is enabled with the option "AHC_SCBPAGING_ENABLE". Full comments on the algorithm are at the top of i386/scsi/aic7xxx.c. options "AHC_TAGENABLE" and "AHC_QUEUE_FULL" have been removed. The default is 4 tags without SCB paging, 8 with. Clear the SCSIRSTI bit after throwing a bus reset. Some cards seem to get confused otherwise. Handle SCSIRSTI interrupts before checking to see if there is a valid SCB in use since this can happen. (Clears PR# i386/1123) Clean up the way we determine the number of SCBs on the card (courtesy of Dan Eischen). Guard against attempts to negotiate wide to a narrow controller. Fix some comments. Update my copyrights.
This commit is contained in:
Justin T. Gibbs
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102d19a473
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=15331
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@ -15,10 +15,20 @@
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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. Absolutely no warranty of function or purpose is made by the author
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* Justin T. Gibbs.
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* 4. Modifications may be freely made to this file if the above conditions
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* are met.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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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 FOR
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* 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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* $Id: aic7xxx.h,v 1.23 1996/03/31 03:15:31 gibbs Exp $
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*/
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@ -38,7 +48,6 @@
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* aic7850 has only 3.
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*/
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/* #define AHCDEBUG */
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typedef unsigned long int physaddr;
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extern u_long ahc_unit;
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@ -55,6 +64,7 @@ typedef enum {
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AHC_TWIN = 0x008, /* Twin Channel */
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AHC_AIC7770 = 0x010,
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AHC_AIC7850 = 0x020,
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AHC_AIC7860 = 0x021, /* ULTRA version of the aic7850 */
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AHC_AIC7870 = 0x040,
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AHC_AIC7880 = 0x041,
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AHC_AIC78X0 = 0x060, /* PCI Based Controller */
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@ -70,13 +80,13 @@ typedef enum {
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AHC_FNONE = 0x00,
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AHC_INIT = 0x01,
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AHC_RUNNING = 0x02,
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AHC_USEDEFAULTS = 0x04, /*
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AHC_PAGESCBS = 0x04, /* Enable SCB paging */
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AHC_USEDEFAULTS = 0x10, /*
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* For cards without an seeprom
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* or a BIOS to initialize the chip's
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* SRAM, we use the default chip and
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* target settings.
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*/
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AHC_EXTSCB = 0x10, /* External SCBs present */
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AHC_CHNLB = 0x20, /*
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* Second controller on 3940
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* Also encodes the offset in the
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@ -87,15 +97,14 @@ typedef enum {
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/*
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* The driver keeps up to MAX_SCB scb structures per card in memory. Only the
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* first 26 bytes of the structure need to be transfered to the card during
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* normal operation. The remaining fields (next_waiting and host_scb) are
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* initialized the first time an SCB is allocated in get_scb(). The fields
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* starting at byte 32 are used for kernel level bookkeeping.
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* normal operation. The fields starting at byte 32 are used for kernel level
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* bookkeeping.
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*/
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struct scb {
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/* ------------ Begin hardware supported fields ---------------- */
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/*0*/ u_char control;
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/*1*/ u_char target_channel_lun; /* 4/1/3 bits */
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/*2*/ u_char target_status;
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/*1*/ u_char tcl; /* 4/1/3 bits */
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/*2*/ u_char status;
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/*3*/ u_char SG_segment_count;
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/*4*/ physaddr SG_list_pointer;
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/*8*/ u_char residual_SG_segment_count;
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@ -107,14 +116,20 @@ struct scb {
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*/
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/*20*/ physaddr cmdpointer;
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/*24*/ u_char cmdlen;
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#define SCB_PIO_TRANSFER_SIZE 25 /* amount we need to upload/download
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/*25*/ u_char tag; /* Index into our kernel SCB array.
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* Also used as the tag for tagged I/O
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*/
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#define SCB_PIO_TRANSFER_SIZE 26 /* amount we need to upload/download
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* via PIO to initialize a transaction.
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*/
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/*25*/ u_char next_waiting; /* Used to thread SCBs awaiting
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* selection
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/*26*/ u_char next; /* Used for threading SCBs in the
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* "Waiting for Selection" and
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* "Disconnected SCB" lists down
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* in the sequencer.
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*/
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/*27*/ u_char prev;
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/*-----------------end of hardware supported fields----------------*/
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SLIST_ENTRY(scb) next; /* in free list */
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STAILQ_ENTRY(scb) links; /* for chaining */
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struct scsi_xfer *xs; /* the scsi_xfer for this cmd */
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int flags;
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#define SCB_FREE 0x00
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@ -125,7 +140,8 @@ struct scb {
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#define SCB_SENSE 0x10
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#define SCB_TIMEDOUT 0x20
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#define SCB_QUEUED_FOR_DONE 0x40
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int position; /* Position in scbarray */
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#define SCB_PAGED_OUT 0x80
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u_char position; /* Position in card's scbarray */
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struct ahc_dma_seg ahc_dma[AHC_NSEG] __attribute__ ((packed));
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struct scsi_sense sense_cmd; /* SCSI command block */
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};
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@ -136,11 +152,27 @@ struct ahc_data {
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ahc_flag flags;
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u_long baseport;
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struct scb *scbarray[AHC_SCB_MAX]; /* Mirror boards scbarray */
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SLIST_HEAD(, scb) free_scb;
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int our_id; /* our scsi id */
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int our_id_b; /* B channel scsi id */
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int vect;
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struct scb *immed_ecb; /* an outstanding immediate command */
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struct scb *pagedout_ntscbs[16];/*
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* Paged out, non-tagged scbs
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* indexed by target.
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*/
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STAILQ_HEAD(, scb) free_scbs; /*
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* SCBs assigned to free slots
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* on the card. (no paging required)
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*/
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STAILQ_HEAD(, scb) page_scbs; /*
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* SCBs that will require paging
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* before use (no assigned slot)
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*/
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STAILQ_HEAD(, scb) waiting_scbs;/*
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* SCBs waiting to be paged in
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* and started.
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*/
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STAILQ_HEAD(, scb)assigned_scbs;/*
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* SCBs that were waiting but have
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* now been assigned a slot by
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* ahc_free_scb.
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*/
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struct scsi_link sc_link;
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struct scsi_link sc_link_b; /* Second bus for Twin channel cards */
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u_short needsdtr_orig; /* Targets we initiate sync neg with */
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@ -151,15 +183,23 @@ struct ahc_data {
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u_short wdtrpending; /* Pending WDTR to these targets */
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u_short tagenable; /* Targets that can handle tagqueing */
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u_short discenable; /* Targets allowed to disconnect */
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int numscbs;
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int activescbs;
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u_char maxscbs;
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u_char our_id; /* our scsi id */
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u_char our_id_b; /* B channel scsi id */
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u_char numscbs;
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u_char activescbs;
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u_char maxhscbs; /* Number of SCBs on the card */
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u_char maxscbs; /*
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* Max SCBs we allocate total including
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* any that will force us to page SCBs
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*/
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u_char qcntmask;
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u_char unpause;
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u_char pause;
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u_char in_timeout;
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};
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/* #define AHC_DEBUG */
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#ifdef AHC_DEBUG
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/* Different debugging levels used when AHC_DEBUG is defined */
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#define AHC_SHOWMISC 0x0001
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#define AHC_SHOWCMDS 0x0002
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@ -167,9 +207,9 @@ struct ahc_data {
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#define AHC_SHOWABORTS 0x0008
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#define AHC_SHOWSENSE 0x0010
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#define AHC_SHOWSCBCNT 0x0020
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/* #define AHC_DEBUG */
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extern int ahc_debug; /* Initialized in i386/scsi/aic7xxx.c */
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#endif
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void ahc_reset __P((u_long iobase));
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struct ahc_data *ahc_alloc __P((int unit, u_long io_base, ahc_type type, ahc_flag flags));
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