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freebsd-skq/sys/dev/isci/isci.h
Jim Harris dd92530581 Wait until completion context unwinds before retrying CCBs that have been 
queued internally.  This works around issue in the isci HAL where it cannot
accept new I/O to a device after a resetting->ready state transition until
the completion context has unwound.

This issue was found by submitting non-tagged CCBs through pass(4) interface
to a SATA disk with an extremely small timeout value (5ms).  This would trigger
internal resets with I/O in the isci(4) internal queues.

The small timeout value had not been intentional (and original reporter has
since changed his test to use 5sec instead), but it did uncover this corner
case that would result in a hung disk.

Sponsored by: Intel
Reported and tested by: Ravi Pokala <rpokala at panasas dot com>
Reviewed by: scottl (earlier version)
MFC after: 1 week
2012-05-21 22:54:33 +00:00

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/*-
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _ISCI_H
#define _ISCI_H
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_sim.h>
#include <cam/cam_xpt_sim.h>
#include <dev/isci/environment.h>
#include <dev/isci/scil/intel_pci.h>
#include <dev/isci/scil/sci_types.h>
#include <dev/isci/scil/sci_object.h>
#include <dev/isci/scil/sci_status.h>
#include <dev/isci/scil/sci_pool.h>
#include <dev/isci/scil/sci_fast_list.h>
#include <dev/isci/scil/sci_controller_constants.h>
#include <dev/isci/scil/scic_controller.h>
#include <dev/isci/scil/scic_config_parameters.h>
#define DEVICE2SOFTC(dev) ((struct isci_softc *) device_get_softc(dev))
#define DEVICE_TIMEOUT 1000
#define SCI_MAX_TIMERS 32
#define ISCI_NUM_PCI_BARS 2
#define ISCI_MAX_LUN 8
MALLOC_DECLARE(M_ISCI);
struct ISCI_TIMER {
struct callout callout;
SCI_TIMER_CALLBACK_T callback;
void *cookie;
BOOL is_started;
};
struct ISCI_REMOTE_DEVICE {
uint32_t index;
struct ISCI_DOMAIN *domain;
SCI_REMOTE_DEVICE_HANDLE_T sci_object;
BOOL is_resetting;
uint32_t frozen_lun_mask;
SCI_FAST_LIST_ELEMENT_T pending_device_reset_element;
/*
* This queue maintains CCBs that have been returned with
* SCI_IO_FAILURE_INVALID_STATE from the SCI layer. These CCBs
* need to be retried, but we cannot return CAM_REQUEUE_REQ because
* this status gets passed all the way back up to users of the pass(4)
* interface and breaks things like smartctl. So instead, we queue
* these CCBs internally.
*/
TAILQ_HEAD(,ccb_hdr) queued_ccbs;
/*
* Marker denoting this remote device needs its first queued ccb to
* be retried.
*/
BOOL release_queued_ccb;
/*
* Points to a CCB in the queue that is currently being processed by
* SCIL. This allows us to keep in flight CCBs in the queue so as to
* maintain ordering (i.e. in case we retry an I/O and then find out
* it needs to be retried again - it just keeps its same place in the
* queue.
*/
union ccb * queued_ccb_in_progress;
};
struct ISCI_DOMAIN {
struct ISCI_CONTROLLER *controller;
SCI_DOMAIN_HANDLE_T sci_object;
uint8_t index;
struct ISCI_REMOTE_DEVICE *da_remote_device;
};
struct ISCI_MEMORY
{
bus_addr_t physical_address;
bus_dma_tag_t dma_tag;
bus_dmamap_t dma_map;
POINTER_UINT virtual_address;
uint32_t size;
int error;
};
struct ISCI_INTERRUPT_INFO
{
SCIC_CONTROLLER_HANDLER_METHODS_T *handlers;
void *interrupt_target_handle;
struct resource *res;
int rid;
void *tag;
};
struct ISCI_CONTROLLER
{
struct isci_softc *isci;
uint8_t index;
SCI_CONTROLLER_HANDLE_T scif_controller_handle;
struct ISCI_DOMAIN domain[SCI_MAX_DOMAINS];
BOOL is_started;
BOOL has_been_scanned;
uint32_t initial_discovery_mask;
BOOL is_frozen;
BOOL release_queued_ccbs;
uint8_t *remote_device_memory;
struct ISCI_MEMORY cached_controller_memory;
struct ISCI_MEMORY uncached_controller_memory;
struct ISCI_MEMORY request_memory;
bus_dma_tag_t buffer_dma_tag;
struct mtx lock;
struct cam_sim *sim;
struct cam_path *path;
struct ISCI_REMOTE_DEVICE *remote_device[SCI_MAX_REMOTE_DEVICES];
void *timer_memory;
SCIC_OEM_PARAMETERS_T oem_parameters;
uint32_t oem_parameters_version;
uint32_t queue_depth;
uint32_t sim_queue_depth;
SCI_FAST_LIST_T pending_device_reset_list;
SCI_MEMORY_DESCRIPTOR_LIST_HANDLE_T mdl;
SCI_POOL_CREATE(remote_device_pool, struct ISCI_REMOTE_DEVICE *, SCI_MAX_REMOTE_DEVICES);
SCI_POOL_CREATE(request_pool, struct ISCI_REQUEST *, SCI_MAX_IO_REQUESTS);
SCI_POOL_CREATE(timer_pool, struct ISCI_TIMER *, SCI_MAX_TIMERS);
};
struct ISCI_REQUEST
{
SCI_CONTROLLER_HANDLE_T controller_handle;
SCI_REMOTE_DEVICE_HANDLE_T remote_device_handle;
bus_dma_tag_t dma_tag;
bus_dmamap_t dma_map;
SCI_PHYSICAL_ADDRESS physical_address;
struct callout timer;
};
struct ISCI_IO_REQUEST
{
struct ISCI_REQUEST parent;
SCI_IO_REQUEST_HANDLE_T sci_object;
union ccb *ccb;
uint32_t num_segments;
uint32_t current_sge_index;
bus_dma_segment_t *sge;
};
struct ISCI_TASK_REQUEST
{
struct ISCI_REQUEST parent;
struct scsi_sense_data sense_data;
SCI_TASK_REQUEST_HANDLE_T sci_object;
union ccb *ccb;
};
struct ISCI_PCI_BAR {
bus_space_tag_t bus_tag;
bus_space_handle_t bus_handle;
int resource_id;
struct resource *resource;
};
/*
* One of these per allocated PCI device.
*/
struct isci_softc {
struct ISCI_PCI_BAR pci_bar[ISCI_NUM_PCI_BARS];
struct ISCI_CONTROLLER controllers[SCI_MAX_CONTROLLERS];
SCI_LIBRARY_HANDLE_T sci_library_handle;
void * sci_library_memory;
SCIC_CONTROLLER_HANDLER_METHODS_T handlers[4];
struct ISCI_INTERRUPT_INFO interrupt_info[4];
uint32_t controller_count;
uint32_t num_interrupts;
uint32_t coalesce_number;
uint32_t coalesce_timeout;
device_t device;
SCI_PCI_COMMON_HEADER_T pci_common_header;
BOOL oem_parameters_found;
struct intr_config_hook config_hook;
};
int isci_allocate_resources(device_t device);
int isci_allocate_dma_buffer(device_t device, struct ISCI_MEMORY *memory);
void isci_remote_device_reset(struct ISCI_REMOTE_DEVICE *remote_device,
union ccb *ccb);
/**
* Returns the negotiated link rate (in KB/s) for the associated
* remote device. Used to fill out bitrate field for GET_TRANS_SETTINGS.
* Will match the negotiated link rate for the lowest numbered local phy
* in the port/domain containing this remote device.
*/
uint32_t isci_remote_device_get_bitrate(
struct ISCI_REMOTE_DEVICE *remote_device);
void isci_remote_device_freeze_lun_queue(
struct ISCI_REMOTE_DEVICE *remote_device, lun_id_t lun);
void isci_remote_device_release_lun_queue(
struct ISCI_REMOTE_DEVICE *remote_device, lun_id_t lun);
void isci_remote_device_release_device_queue(
struct ISCI_REMOTE_DEVICE * remote_device);
void isci_request_construct(struct ISCI_REQUEST *request,
SCI_CONTROLLER_HANDLE_T scif_controller_handle,
bus_dma_tag_t io_buffer_dma_tag, bus_addr_t physical_address);
#define isci_io_request_get_max_io_size() \
((SCI_MAX_SCATTER_GATHER_ELEMENTS - 1) * PAGE_SIZE)
#define isci_task_request_get_object_size() \
(sizeof(struct ISCI_TASK_REQUEST) + scif_task_request_get_object_size())
#define isci_io_request_get_object_size() \
(sizeof(struct ISCI_IO_REQUEST) + scif_io_request_get_object_size())
#define isci_request_get_object_size() \
max( \
isci_task_request_get_object_size(), \
isci_io_request_get_object_size() \
)
void isci_io_request_execute_scsi_io(union ccb *ccb,
struct ISCI_CONTROLLER *controller);
#if __FreeBSD_version >= 900026
void isci_io_request_execute_smp_io(
union ccb *ccb, struct ISCI_CONTROLLER *controller);
#endif
void isci_io_request_timeout(void *);
void isci_get_oem_parameters(struct isci_softc *isci);
void isci_io_request_complete(
SCI_CONTROLLER_HANDLE_T scif_controller,
SCI_REMOTE_DEVICE_HANDLE_T remote_device,
struct ISCI_IO_REQUEST * isci_request, SCI_IO_STATUS completion_status);
void isci_task_request_complete(
SCI_CONTROLLER_HANDLE_T scif_controller,
SCI_REMOTE_DEVICE_HANDLE_T remote_device,
SCI_TASK_REQUEST_HANDLE_T io_request, SCI_TASK_STATUS completion_status);
void isci_sysctl_initialize(struct isci_softc *isci);
void isci_controller_construct(struct ISCI_CONTROLLER *controller,
struct isci_softc *isci);
SCI_STATUS isci_controller_initialize(struct ISCI_CONTROLLER *controller);
int isci_controller_allocate_memory(struct ISCI_CONTROLLER *controller);
void isci_controller_domain_discovery_complete(
struct ISCI_CONTROLLER *isci_controller, struct ISCI_DOMAIN *isci_domain);
int isci_controller_attach_to_cam(struct ISCI_CONTROLLER *controller);
void isci_controller_start(void *controller);
void isci_controller_release_queued_ccbs(struct ISCI_CONTROLLER *controller);
void isci_domain_construct(struct ISCI_DOMAIN *domain, uint32_t domain_index,
struct ISCI_CONTROLLER *controller);
void isci_interrupt_setup(struct isci_softc *isci);
void isci_interrupt_poll_handler(struct ISCI_CONTROLLER *controller);
void isci_log_message(uint32_t verbosity, char *log_message_prefix,
char *log_message, ...);
extern uint32_t g_isci_debug_level;
#endif /* #ifndef _ISCI_H */
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