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ff1e67ab93
correctly tell CAM to requeue the command and then freeze it's queue. The problem was that when resources became available again, it wouldn't tell CAM to unfreeze it's queue, so no more commands would ever be delivered. This is simialr to the bug that was fixed in the cciss driver last year. This is a bug in 4-STABLE also, but is probably masked by the OS being fast enough to drain the completion queue before it fills up. Also add some diagnostics avaialble when compiled with MLY_DEBUG. Thanks very much to LSI Corp for donating equipment to track this down, and Vaidus Damosevicius for pestering me long enough to get it fixed.
388 lines
15 KiB
C
388 lines
15 KiB
C
/*-
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* Copyright (c) 2000, 2001 Michael Smith
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* Copyright (c) 2000 BSDi
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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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********************************************************************************
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Driver Parameter Definitions
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********************************************************************************
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********************************************************************************/
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/*
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* The firmware interface allows for a 16-bit command identifier. A lookup
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* table this size (256k) would be too expensive, so we cap ourselves at a
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* reasonable limit.
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*/
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#define MLY_MAX_COMMANDS 256 /* max commands per controller */
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/*
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* The firmware interface allows for a 16-bit s/g list length. We limit
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* ourselves to a reasonable maximum and ensure alignment.
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*/
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#define MLY_MAX_SGENTRIES 64 /* max S/G entries, limit 65535 */
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/*
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* The interval at which we poke the controller for status updates (in seconds).
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*/
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#define MLY_PERIODIC_INTERVAL 1
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/********************************************************************************
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********************************************************************************
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Cross-version Compatibility
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********************************************************************************
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********************************************************************************/
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#if __FreeBSD_version >= 500005
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# include <sys/taskqueue.h>
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#endif
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#if __FreeBSD_version <= 500014
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# include <machine/clock.h>
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# undef offsetof
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# define offsetof(type, field) ((size_t)(&((type *)0)->field))
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#endif
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#ifndef INTR_ENTROPY
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# define INTR_ENTROPY 0
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#endif
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/********************************************************************************
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********************************************************************************
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Driver Variable Definitions
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********************************************************************************
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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 - noisy, emit major function points and things done
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* 2 - extremely noisy, emit trace items in loops, etc.
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*/
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#ifdef MLY_DEBUG
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# define debug(level, fmt, args...) do { if (level <= MLY_DEBUG) printf("%s: " fmt "\n", __func__ , ##args); } while(0)
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# define debug_called(level) do { if (level <= MLY_DEBUG) printf("%s: called\n", __func__); } 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_field(s, f) printf(" OFFSET %s.%s: %d\n", #s, #f, ((int)&(((struct s *)0)->f)))
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extern void mly_printstate0(void);
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extern struct mly_softc *mly_softc0;
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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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#endif
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#define mly_printf(sc, fmt, args...) device_printf(sc->mly_dev, fmt , ##args)
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/*
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* Per-device structure, used to save persistent state on devices.
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*
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* Note that this isn't really Bus/Target/Lun since we don't support
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* lun != 0 at this time.
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*/
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struct mly_btl {
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int mb_flags;
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#define MLY_BTL_PHYSICAL (1<<0) /* physical device */
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#define MLY_BTL_LOGICAL (1<<1) /* logical device */
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#define MLY_BTL_PROTECTED (1<<2) /* device is protected - I/O not allowed */
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#define MLY_BTL_RESCAN (1<<3) /* device needs to be rescanned */
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char mb_name[16]; /* peripheral attached to this device */
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int mb_state; /* see 8.1 */
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int mb_type; /* see 8.2 */
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/* physical devices only */
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int mb_speed; /* interface transfer rate */
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int mb_width; /* interface width */
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};
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/*
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* Per-command control structure.
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*/
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struct mly_command {
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TAILQ_ENTRY(mly_command) mc_link; /* list linkage */
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struct mly_softc *mc_sc; /* controller that owns us */
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u_int16_t mc_slot; /* command slot we occupy */
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int mc_flags;
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#define MLY_CMD_BUSY (1<<0) /* command is being run, or ready to run, or not completed */
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#define MLY_CMD_COMPLETE (1<<1) /* command has been completed */
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#define MLY_CMD_MAPPED (1<<3) /* command has had its data mapped */
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#define MLY_CMD_DATAIN (1<<4) /* data moves controller->system */
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#define MLY_CMD_DATAOUT (1<<5) /* data moves system->controller */
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u_int16_t mc_status; /* command completion status */
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u_int8_t mc_sense; /* sense data length */
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int32_t mc_resid; /* I/O residual count */
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union mly_command_packet *mc_packet; /* our controller command */
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u_int64_t mc_packetphys; /* physical address of the mapped packet */
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void *mc_data; /* data buffer */
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size_t mc_length; /* data length */
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bus_dmamap_t mc_datamap; /* DMA map for data */
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void (* mc_complete)(struct mly_command *mc); /* completion handler */
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void *mc_private; /* caller-private data */
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int mc_timestamp;
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};
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/*
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* Command slot regulation.
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*
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* We can't use slot 0 due to the memory mailbox implementation.
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*/
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#define MLY_SLOT_START 1
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#define MLY_SLOT_MAX (MLY_SLOT_START + MLY_MAX_COMMANDS)
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/*
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* Per-controller structure.
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*/
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struct mly_softc {
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/* bus connections */
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device_t mly_dev;
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dev_t mly_dev_t;
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struct resource *mly_regs_resource; /* register interface window */
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int mly_regs_rid; /* resource ID */
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bus_space_handle_t mly_bhandle; /* bus space handle */
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bus_space_tag_t mly_btag; /* bus space tag */
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bus_dma_tag_t mly_parent_dmat; /* parent DMA tag */
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bus_dma_tag_t mly_buffer_dmat; /* data buffer/command DMA tag */
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struct resource *mly_irq; /* interrupt */
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int mly_irq_rid;
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void *mly_intr; /* interrupt handle */
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/* scatter/gather lists and their controller-visible mappings */
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struct mly_sg_entry *mly_sg_table; /* s/g lists */
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u_int32_t mly_sg_busaddr; /* s/g table base address in bus space */
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bus_dma_tag_t mly_sg_dmat; /* s/g buffer DMA tag */
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bus_dmamap_t mly_sg_dmamap; /* map for s/g buffers */
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/* controller hardware interface */
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int mly_hwif;
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#define MLY_HWIF_I960RX 0
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#define MLY_HWIF_STRONGARM 1
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u_int8_t mly_doorbell_true; /* xor map to make hardware doorbell 'true' bits into 1s */
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u_int8_t mly_command_mailbox; /* register offsets */
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u_int8_t mly_status_mailbox;
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u_int8_t mly_idbr;
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u_int8_t mly_odbr;
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u_int8_t mly_error_status;
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u_int8_t mly_interrupt_status;
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u_int8_t mly_interrupt_mask;
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struct mly_mmbox *mly_mmbox; /* kernel-space address of memory mailbox */
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u_int64_t mly_mmbox_busaddr; /* bus-space address of memory mailbox */
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bus_dma_tag_t mly_mmbox_dmat; /* memory mailbox DMA tag */
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bus_dmamap_t mly_mmbox_dmamap; /* memory mailbox DMA map */
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u_int32_t mly_mmbox_command_index; /* next index to use */
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u_int32_t mly_mmbox_status_index; /* index we next expect status at */
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/* controller features, limits and status */
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int mly_state;
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#define MLY_STATE_OPEN (1<<1)
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#define MLY_STATE_INTERRUPTS_ON (1<<2)
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#define MLY_STATE_MMBOX_ACTIVE (1<<3)
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#define MLY_STATE_CAM_FROZEN (1<<4)
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struct mly_ioctl_getcontrollerinfo *mly_controllerinfo;
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struct mly_param_controller *mly_controllerparam;
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struct mly_btl mly_btl[MLY_MAX_CHANNELS][MLY_MAX_TARGETS];
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/* command management */
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struct mly_command mly_command[MLY_MAX_COMMANDS]; /* commands */
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union mly_command_packet *mly_packet; /* command packets */
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bus_dma_tag_t mly_packet_dmat; /* packet DMA tag */
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bus_dmamap_t mly_packetmap; /* packet DMA map */
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u_int64_t mly_packetphys; /* packet array base address */
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TAILQ_HEAD(,mly_command) mly_free; /* commands available for reuse */
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TAILQ_HEAD(,mly_command) mly_busy;
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TAILQ_HEAD(,mly_command) mly_complete; /* commands which have been returned by the controller */
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struct mly_qstat mly_qstat[MLYQ_COUNT]; /* queue statistics */
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/* health monitoring */
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u_int32_t mly_event_change; /* event status change indicator */
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u_int32_t mly_event_counter; /* next event for which we anticpiate status */
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u_int32_t mly_event_waiting; /* next event the controller will post status for */
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struct callout_handle mly_periodic; /* periodic event handling */
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/* CAM connection */
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struct cam_devq *mly_cam_devq; /* CAM device queue */
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struct cam_sim *mly_cam_sim[MLY_MAX_CHANNELS]; /* CAM SIMs */
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struct cam_path *mly_cam_path; /* rescan path */
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int mly_cam_channels; /* total channel count */
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#if __FreeBSD_version >= 500005
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/* command-completion task */
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struct task mly_task_complete; /* deferred-completion task */
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#endif
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int mly_qfrzn_cnt; /* Track simq freezes */
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};
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/*
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* Register access helpers.
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*/
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#define MLY_SET_REG(sc, reg, val) bus_space_write_1(sc->mly_btag, sc->mly_bhandle, reg, val)
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#define MLY_GET_REG(sc, reg) bus_space_read_1 (sc->mly_btag, sc->mly_bhandle, reg)
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#define MLY_GET_REG2(sc, reg) bus_space_read_2 (sc->mly_btag, sc->mly_bhandle, reg)
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#define MLY_GET_REG4(sc, reg) bus_space_read_4 (sc->mly_btag, sc->mly_bhandle, reg)
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#define MLY_SET_MBOX(sc, mbox, ptr) \
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do { \
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bus_space_write_4(sc->mly_btag, sc->mly_bhandle, mbox, *((u_int32_t *)ptr)); \
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bus_space_write_4(sc->mly_btag, sc->mly_bhandle, mbox + 4, *((u_int32_t *)ptr + 1)); \
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bus_space_write_4(sc->mly_btag, sc->mly_bhandle, mbox + 8, *((u_int32_t *)ptr + 2)); \
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bus_space_write_4(sc->mly_btag, sc->mly_bhandle, mbox + 12, *((u_int32_t *)ptr + 3)); \
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} while(0);
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#define MLY_GET_MBOX(sc, mbox, ptr) \
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do { \
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*((u_int32_t *)ptr) = bus_space_read_4(sc->mly_btag, sc->mly_bhandle, mbox); \
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*((u_int32_t *)ptr + 1) = bus_space_read_4(sc->mly_btag, sc->mly_bhandle, mbox + 4); \
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*((u_int32_t *)ptr + 2) = bus_space_read_4(sc->mly_btag, sc->mly_bhandle, mbox + 8); \
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*((u_int32_t *)ptr + 3) = bus_space_read_4(sc->mly_btag, sc->mly_bhandle, mbox + 12); \
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} while(0);
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#define MLY_IDBR_TRUE(sc, mask) \
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((((MLY_GET_REG((sc), (sc)->mly_idbr)) ^ (sc)->mly_doorbell_true) & (mask)) == (mask))
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#define MLY_ODBR_TRUE(sc, mask) \
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((MLY_GET_REG((sc), (sc)->mly_odbr) & (mask)) == (mask))
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#define MLY_ERROR_VALID(sc) \
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((((MLY_GET_REG((sc), (sc)->mly_error_status)) ^ (sc)->mly_doorbell_true) & (MLY_MSG_EMPTY)) == 0)
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#define MLY_MASK_INTERRUPTS(sc) \
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do { \
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MLY_SET_REG((sc), (sc)->mly_interrupt_mask, MLY_INTERRUPT_MASK_DISABLE); \
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sc->mly_state &= ~MLY_STATE_INTERRUPTS_ON; \
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} while(0);
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#define MLY_UNMASK_INTERRUPTS(sc) \
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do { \
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MLY_SET_REG((sc), (sc)->mly_interrupt_mask, MLY_INTERRUPT_MASK_ENABLE); \
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sc->mly_state |= MLY_STATE_INTERRUPTS_ON; \
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} while(0);
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/*
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* Bus/target/logical ID-related macros.
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*/
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#define MLY_LOGDEV_ID(sc, bus, target) (((bus) - (sc)->mly_controllerinfo->physical_channels_present) * \
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MLY_MAX_TARGETS + (target))
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#define MLY_LOGDEV_BUS(sc, logdev) (((logdev) / MLY_MAX_TARGETS) + \
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(sc)->mly_controllerinfo->physical_channels_present)
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#define MLY_LOGDEV_TARGET(sc, logdev) ((logdev) % MLY_MAX_TARGETS)
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#define MLY_BUS_IS_VIRTUAL(sc, bus) ((bus) >= (sc)->mly_controllerinfo->physical_channels_present)
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#define MLY_BUS_IS_VALID(sc, bus) (((bus) < (sc)->mly_cam_channels) && ((sc)->mly_cam_sim[(bus)] != NULL))
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/********************************************************************************
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* Queue primitives
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*/
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#define MLYQ_ADD(sc, qname) \
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do { \
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struct mly_qstat *qs = &(sc)->mly_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 MLYQ_REMOVE(sc, qname) (sc)->mly_qstat[qname].q_length--
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#define MLYQ_INIT(sc, qname) \
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do { \
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sc->mly_qstat[qname].q_length = 0; \
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sc->mly_qstat[qname].q_max = 0; \
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} while(0)
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#define MLYQ_COMMAND_QUEUE(name, index) \
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static __inline void \
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mly_initq_ ## name (struct mly_softc *sc) \
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{ \
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TAILQ_INIT(&sc->mly_ ## name); \
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MLYQ_INIT(sc, index); \
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} \
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static __inline void \
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mly_enqueue_ ## name (struct mly_command *mc) \
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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(&mc->mc_sc->mly_ ## name, mc, mc_link); \
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MLYQ_ADD(mc->mc_sc, index); \
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splx(s); \
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} \
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static __inline void \
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mly_requeue_ ## name (struct mly_command *mc) \
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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(&mc->mc_sc->mly_ ## name, mc, mc_link); \
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MLYQ_ADD(mc->mc_sc, index); \
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splx(s); \
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} \
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static __inline struct mly_command * \
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mly_dequeue_ ## name (struct mly_softc *sc) \
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{ \
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struct mly_command *mc; \
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int s; \
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\
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s = splcam(); \
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if ((mc = TAILQ_FIRST(&sc->mly_ ## name)) != NULL) { \
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TAILQ_REMOVE(&sc->mly_ ## name, mc, mc_link); \
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MLYQ_REMOVE(sc, index); \
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} \
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splx(s); \
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return(mc); \
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} \
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static __inline void \
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mly_remove_ ## name (struct mly_command *mc) \
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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_REMOVE(&mc->mc_sc->mly_ ## name, mc, mc_link); \
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MLYQ_REMOVE(mc->mc_sc, index); \
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splx(s); \
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} \
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struct hack
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MLYQ_COMMAND_QUEUE(free, MLYQ_FREE);
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MLYQ_COMMAND_QUEUE(busy, MLYQ_BUSY);
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MLYQ_COMMAND_QUEUE(complete, MLYQ_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, 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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