384 lines
12 KiB
C
384 lines
12 KiB
C
/*-
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* Copyright (c) 2001 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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* $FreeBSD$
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*/
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/*
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* CISS adapter driver datastructures
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*/
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/************************************************************************
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* Tunable parameters
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*/
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/*
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* There is no guaranteed upper bound on the number of concurrent
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* commands an adapter may claim to support. Cap it at a reasonable
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* value.
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*/
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#define CISS_MAX_REQUESTS 256
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/*
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* Maximum number of logical drives we support.
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*/
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#define CISS_MAX_LOGICAL 15
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/*
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* Interrupt reduction can be controlled by tuning the interrupt
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* coalesce delay and count paramters. The delay (in microseconds)
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* defers delivery of interrupts to increase the chance of there being
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* more than one completed command ready when the interrupt is
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* delivered. The count expedites the delivery of the interrupt when
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* the given number of commands are ready.
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*
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* If the delay is set to 0, interrupts are delivered immediately.
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*/
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#define CISS_INTERRUPT_COALESCE_DELAY 1000
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#define CISS_INTERRUPT_COALESCE_COUNT 16
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/*
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* Heartbeat routine timeout in seconds. Note that since event
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* handling is performed on a callback basis, we don't need this to
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* run very often.
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*/
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#define CISS_HEARTBEAT_RATE 10
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/*
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* Maximum number of events we will queue for a monitoring utility.
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*/
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#define CISS_MAX_EVENTS 32
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/************************************************************************
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* Compatibility with older versions of FreeBSD
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*/
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#if __FreeBSD_version < 440001
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#warning testing old-FreeBSD compat
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typedef struct proc d_thread_t;
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#endif
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/************************************************************************
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* Command queue statistics
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*/
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#define CISSQ_FREE 0
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#define CISSQ_BUSY 1
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#define CISSQ_COMPLETE 2
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#define CISSQ_COUNT 3
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struct ciss_qstat
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{
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u_int32_t q_length;
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u_int32_t q_max;
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};
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/************************************************************************
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* Driver version. Only really significant to the ACU interface.
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*/
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#define CISS_DRIVER_VERSION 20011201
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/************************************************************************
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* Driver data structures
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*/
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/*
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* Each command issued to the adapter is managed by a request
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* structure.
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*/
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struct ciss_request
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{
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TAILQ_ENTRY(ciss_request) cr_link;
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int cr_onq; /* which queue we are on */
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struct ciss_softc *cr_sc; /* controller softc */
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void *cr_data; /* data buffer */
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u_int32_t cr_length; /* data length */
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bus_dmamap_t cr_datamap; /* DMA map for data */
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int cr_tag;
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int cr_flags;
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#define CISS_REQ_MAPPED (1<<0) /* data mapped */
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#define CISS_REQ_SLEEP (1<<1) /* submitter sleeping */
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#define CISS_REQ_POLL (1<<2) /* submitter polling */
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#define CISS_REQ_DATAOUT (1<<3) /* data host->adapter */
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#define CISS_REQ_DATAIN (1<<4) /* data adapter->host */
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void (* cr_complete)(struct ciss_request *);
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void *cr_private;
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};
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/*
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* The adapter command structure is defined with a zero-length
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* scatter/gather list size. In practise, we want space for a
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* scatter-gather list, and we also want to avoid having commands
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* cross page boundaries.
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*
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* Note that 512 bytes yields 28 scatter/gather entries, or the
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* ability to map (26 * PAGE_SIZE) + 2 bytes of data. On x86, this is
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* 104kB. 256 bytes would only yield 12 entries, giving a mere 40kB,
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* too small.
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*/
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#define CISS_COMMAND_ALLOC_SIZE 512 /* XXX tune to get sensible s/g list length */
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#define CISS_COMMAND_SG_LENGTH ((CISS_COMMAND_ALLOC_SIZE - sizeof(struct ciss_command)) \
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/ sizeof(struct ciss_sg_entry))
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/*
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* Per-logical-drive data.
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*/
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struct ciss_ldrive
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{
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union ciss_device_address cl_address;
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int cl_status;
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#define CISS_LD_NONEXISTENT 0
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#define CISS_LD_ONLINE 1
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#define CISS_LD_OFFLINE 2
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struct ciss_bmic_id_ldrive *cl_ldrive;
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struct ciss_bmic_id_lstatus *cl_lstatus;
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char cl_name[16]; /* device name */
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};
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/*
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* Per-adapter data
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*/
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struct ciss_softc
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{
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/* bus connections */
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device_t ciss_dev; /* bus attachment */
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dev_t ciss_dev_t; /* control device */
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struct resource *ciss_regs_resource; /* register interface window */
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int ciss_regs_rid; /* resource ID */
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bus_space_handle_t ciss_regs_bhandle; /* bus space handle */
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bus_space_tag_t ciss_regs_btag; /* bus space tag */
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struct resource *ciss_cfg_resource; /* config struct interface window */
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int ciss_cfg_rid; /* resource ID */
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struct ciss_config_table *ciss_cfg; /* config table in adapter memory */
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struct ciss_bmic_id_table *ciss_id; /* ID table in host memory */
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u_int32_t ciss_heartbeat; /* last heartbeat value */
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int ciss_heart_attack; /* number of times we have seen this value */
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struct resource *ciss_irq_resource; /* interrupt */
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int ciss_irq_rid; /* resource ID */
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void *ciss_intr; /* interrupt handle */
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bus_dma_tag_t ciss_parent_dmat; /* parent DMA tag */
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bus_dma_tag_t ciss_buffer_dmat; /* data buffer/command DMA tag */
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u_int32_t ciss_interrupt_mask; /* controller interrupt mask bits */
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int ciss_max_requests;
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struct ciss_request ciss_request[CISS_MAX_REQUESTS]; /* requests */
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void *ciss_command; /* command structures */
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bus_dma_tag_t ciss_command_dmat; /* command DMA tag */
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bus_dmamap_t ciss_command_map; /* command DMA map */
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u_int32_t ciss_command_phys; /* command array base address */
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TAILQ_HEAD(,ciss_request) ciss_free; /* requests available for reuse */
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TAILQ_HEAD(,ciss_request) ciss_busy; /* requests in the adapter */
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TAILQ_HEAD(,ciss_request) ciss_complete; /* requests which have been returned by the adapter */
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struct callout_handle ciss_periodic; /* periodic event handling */
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struct ciss_request *ciss_periodic_notify; /* notify callback request */
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struct ciss_notify ciss_notify[CISS_MAX_EVENTS];
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int ciss_notify_head; /* saved-event ringbuffer */
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int ciss_notify_tail;
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struct ciss_ldrive ciss_logical[CISS_MAX_LOGICAL];
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struct cam_devq *ciss_cam_devq;
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struct cam_sim *ciss_cam_sim;
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struct cam_path *ciss_cam_path;
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int ciss_flags;
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#define CISS_FLAG_NOTIFY_OK (1<<0) /* notify command running OK */
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#define CISS_FLAG_CONTROL_OPEN (1<<1) /* control device is open */
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#define CISS_FLAG_ABORTING (1<<2) /* driver is going away */
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#define CISS_FLAG_RUNNING (1<<3) /* driver is running (interrupts usable) */
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#define CISS_FLAG_FAKE_SYNCH (1<<16) /* needs SYNCHRONISE_CACHE faked */
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#define CISS_FLAG_BMIC_ABORT (1<<17) /* use BMIC command to abort Notify on Event */
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struct ciss_qstat ciss_qstat[CISSQ_COUNT]; /* queue statistics */
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};
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/*
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* Given a request tag, find the corresponding command in virtual or
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* physical space.
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*
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* The arithmetic here is due to the allocation of ciss_command structures
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* inside CISS_COMMAND_ALLOC_SIZE blocks. See the comment at the definition
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* of CISS_COMMAND_ALLOC_SIZE above.
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*/
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#define CISS_FIND_COMMAND(cr) \
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(struct ciss_command *)((u_int8_t *)(cr)->cr_sc->ciss_command + \
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((cr)->cr_tag * CISS_COMMAND_ALLOC_SIZE))
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#define CISS_FIND_COMMANDPHYS(cr) ((cr)->cr_sc->ciss_command_phys + \
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((cr)->cr_tag * CISS_COMMAND_ALLOC_SIZE))
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/************************************************************************
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* Debugging/diagnostic output.
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*/
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/*
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* Debugging levels:
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* 0 - quiet, only emit warnings
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* 1 - talkative, log major events, but nothing on the I/O path
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* 2 - noisy, log events on the I/O path
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* 3 - extremely noisy, log items in loops
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*/
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#ifdef CISS_DEBUG
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# define debug(level, fmt, args...) \
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do { \
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if (level <= CISS_DEBUG) printf("%s: " fmt "\n", __func__ , ##args); \
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} while(0)
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# define debug_called(level) \
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do { \
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if (level <= CISS_DEBUG) printf("%s: called\n", __func__); \
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} while(0)
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# define debug_struct(s) printf(" SIZE %s: %d\n", #s, sizeof(struct s))
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# define debug_union(s) printf(" SIZE %s: %d\n", #s, sizeof(union s))
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# define debug_type(s) printf(" SIZE %s: %d\n", #s, sizeof(s))
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# define debug_field(s, f) printf(" OFFSET %s.%s: %d\n", #s, #f, ((int)&(((struct s *)0)->f)))
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# define debug_const(c) printf(" CONST %s %d/0x%x\n", #c, c, c);
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#else
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# define debug(level, fmt, args...)
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# define debug_called(level)
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# define debug_struct(s)
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# define debug_union(s)
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# define debug_type(s)
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# define debug_field(s, f)
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# define debug_const(c)
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#endif
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#define ciss_printf(sc, fmt, args...) device_printf(sc->ciss_dev, fmt , ##args)
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/************************************************************************
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* Queue primitives
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*/
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#define CISSQ_ADD(sc, qname) \
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do { \
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struct ciss_qstat *qs = &(sc)->ciss_qstat[qname]; \
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\
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qs->q_length++; \
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if (qs->q_length > qs->q_max) \
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qs->q_max = qs->q_length; \
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} while(0)
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#define CISSQ_REMOVE(sc, qname) (sc)->ciss_qstat[qname].q_length--
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#define CISSQ_INIT(sc, qname) \
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do { \
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sc->ciss_qstat[qname].q_length = 0; \
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sc->ciss_qstat[qname].q_max = 0; \
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} while(0)
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#define CISSQ_REQUEST_QUEUE(name, index) \
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static __inline void \
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ciss_initq_ ## name (struct ciss_softc *sc) \
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{ \
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TAILQ_INIT(&sc->ciss_ ## name); \
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CISSQ_INIT(sc, index); \
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} \
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static __inline void \
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ciss_enqueue_ ## name (struct ciss_request *cr) \
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{ \
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int s; \
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\
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s = splcam(); \
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TAILQ_INSERT_TAIL(&cr->cr_sc->ciss_ ## name, cr, cr_link); \
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CISSQ_ADD(cr->cr_sc, index); \
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cr->cr_onq = index; \
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splx(s); \
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} \
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static __inline void \
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ciss_requeue_ ## name (struct ciss_request *cr) \
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{ \
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int s; \
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\
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s = splcam(); \
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TAILQ_INSERT_HEAD(&cr->cr_sc->ciss_ ## name, cr, cr_link); \
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CISSQ_ADD(cr->cr_sc, index); \
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cr->cr_onq = index; \
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splx(s); \
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} \
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static __inline struct ciss_request * \
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ciss_dequeue_ ## name (struct ciss_softc *sc) \
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{ \
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struct ciss_request *cr; \
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int s; \
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\
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s = splcam(); \
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if ((cr = TAILQ_FIRST(&sc->ciss_ ## name)) != NULL) { \
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TAILQ_REMOVE(&sc->ciss_ ## name, cr, cr_link); \
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CISSQ_REMOVE(sc, index); \
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cr->cr_onq = -1; \
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} \
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splx(s); \
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return(cr); \
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} \
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static __inline int \
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ciss_remove_ ## name (struct ciss_request *cr) \
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{ \
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int s, error; \
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\
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s = splcam(); \
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if (cr->cr_onq != index) { \
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printf("request on queue %d (expected %d)\n", cr->cr_onq, index);\
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error = 1; \
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} else { \
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TAILQ_REMOVE(&cr->cr_sc->ciss_ ## name, cr, cr_link); \
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CISSQ_REMOVE(cr->cr_sc, index); \
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cr->cr_onq = -1; \
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error = 0; \
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} \
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splx(s); \
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return(error); \
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} \
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struct hack
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CISSQ_REQUEST_QUEUE(free, CISSQ_FREE);
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CISSQ_REQUEST_QUEUE(busy, CISSQ_BUSY);
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CISSQ_REQUEST_QUEUE(complete, CISSQ_COMPLETE);
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/********************************************************************************
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* space-fill a character string
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*/
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static __inline void
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padstr(char *targ, const char *src, int len)
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{
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while (len-- > 0) {
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if (*src != 0) {
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*targ++ = *src++;
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} else {
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*targ++ = ' ';
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}
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}
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}
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