mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 03:10:12 +00:00
![Dave C Boutcher](/assets/img/avatar_default.png)
New versions of the Power5 firmware can send a "re-enable" message to the virtual scsi adapter. This fix makes us handle the message correctly. Without it, the driver goes catatonic and the system crashes unpleasantly. Signed-off-by: Dave Boutcher <sleddog@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
1574 lines
46 KiB
C
1574 lines
46 KiB
C
/* ------------------------------------------------------------
|
|
* ibmvscsi.c
|
|
* (C) Copyright IBM Corporation 1994, 2004
|
|
* Authors: Colin DeVilbiss (devilbis@us.ibm.com)
|
|
* Santiago Leon (santil@us.ibm.com)
|
|
* Dave Boutcher (sleddog@us.ibm.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
|
* USA
|
|
*
|
|
* ------------------------------------------------------------
|
|
* Emulation of a SCSI host adapter for Virtual I/O devices
|
|
*
|
|
* This driver supports the SCSI adapter implemented by the IBM
|
|
* Power5 firmware. That SCSI adapter is not a physical adapter,
|
|
* but allows Linux SCSI peripheral drivers to directly
|
|
* access devices in another logical partition on the physical system.
|
|
*
|
|
* The virtual adapter(s) are present in the open firmware device
|
|
* tree just like real adapters.
|
|
*
|
|
* One of the capabilities provided on these systems is the ability
|
|
* to DMA between partitions. The architecture states that for VSCSI,
|
|
* the server side is allowed to DMA to and from the client. The client
|
|
* is never trusted to DMA to or from the server directly.
|
|
*
|
|
* Messages are sent between partitions on a "Command/Response Queue"
|
|
* (CRQ), which is just a buffer of 16 byte entries in the receiver's
|
|
* Senders cannot access the buffer directly, but send messages by
|
|
* making a hypervisor call and passing in the 16 bytes. The hypervisor
|
|
* puts the message in the next 16 byte space in round-robbin fashion,
|
|
* turns on the high order bit of the message (the valid bit), and
|
|
* generates an interrupt to the receiver (if interrupts are turned on.)
|
|
* The receiver just turns off the valid bit when they have copied out
|
|
* the message.
|
|
*
|
|
* The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
|
|
* (IU) (as defined in the T10 standard available at www.t10.org), gets
|
|
* a DMA address for the message, and sends it to the server as the
|
|
* payload of a CRQ message. The server DMAs the SRP IU and processes it,
|
|
* including doing any additional data transfers. When it is done, it
|
|
* DMAs the SRP response back to the same address as the request came from,
|
|
* and sends a CRQ message back to inform the client that the request has
|
|
* completed.
|
|
*
|
|
* Note that some of the underlying infrastructure is different between
|
|
* machines conforming to the "RS/6000 Platform Architecture" (RPA) and
|
|
* the older iSeries hypervisor models. To support both, some low level
|
|
* routines have been broken out into rpa_vscsi.c and iseries_vscsi.c.
|
|
* The Makefile should pick one, not two, not zero, of these.
|
|
*
|
|
* TODO: This is currently pretty tied to the IBM i/pSeries hypervisor
|
|
* interfaces. It would be really nice to abstract this above an RDMA
|
|
* layer.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/delay.h>
|
|
#include <asm/vio.h>
|
|
#include <scsi/scsi.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
#include <scsi/scsi_host.h>
|
|
#include <scsi/scsi_device.h>
|
|
#include "ibmvscsi.h"
|
|
|
|
/* The values below are somewhat arbitrary default values, but
|
|
* OS/400 will use 3 busses (disks, CDs, tapes, I think.)
|
|
* Note that there are 3 bits of channel value, 6 bits of id, and
|
|
* 5 bits of LUN.
|
|
*/
|
|
static int max_id = 64;
|
|
static int max_channel = 3;
|
|
static int init_timeout = 5;
|
|
static int max_requests = 50;
|
|
|
|
#define IBMVSCSI_VERSION "1.5.8"
|
|
|
|
MODULE_DESCRIPTION("IBM Virtual SCSI");
|
|
MODULE_AUTHOR("Dave Boutcher");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(IBMVSCSI_VERSION);
|
|
|
|
module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(max_id, "Largest ID value for each channel");
|
|
module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(max_channel, "Largest channel value");
|
|
module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
|
|
module_param_named(max_requests, max_requests, int, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
|
|
|
|
/* ------------------------------------------------------------
|
|
* Routines for the event pool and event structs
|
|
*/
|
|
/**
|
|
* initialize_event_pool: - Allocates and initializes the event pool for a host
|
|
* @pool: event_pool to be initialized
|
|
* @size: Number of events in pool
|
|
* @hostdata: ibmvscsi_host_data who owns the event pool
|
|
*
|
|
* Returns zero on success.
|
|
*/
|
|
static int initialize_event_pool(struct event_pool *pool,
|
|
int size, struct ibmvscsi_host_data *hostdata)
|
|
{
|
|
int i;
|
|
|
|
pool->size = size;
|
|
pool->next = 0;
|
|
pool->events = kmalloc(pool->size * sizeof(*pool->events), GFP_KERNEL);
|
|
if (!pool->events)
|
|
return -ENOMEM;
|
|
memset(pool->events, 0x00, pool->size * sizeof(*pool->events));
|
|
|
|
pool->iu_storage =
|
|
dma_alloc_coherent(hostdata->dev,
|
|
pool->size * sizeof(*pool->iu_storage),
|
|
&pool->iu_token, 0);
|
|
if (!pool->iu_storage) {
|
|
kfree(pool->events);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < pool->size; ++i) {
|
|
struct srp_event_struct *evt = &pool->events[i];
|
|
memset(&evt->crq, 0x00, sizeof(evt->crq));
|
|
atomic_set(&evt->free, 1);
|
|
evt->crq.valid = 0x80;
|
|
evt->crq.IU_length = sizeof(*evt->xfer_iu);
|
|
evt->crq.IU_data_ptr = pool->iu_token +
|
|
sizeof(*evt->xfer_iu) * i;
|
|
evt->xfer_iu = pool->iu_storage + i;
|
|
evt->hostdata = hostdata;
|
|
evt->ext_list = NULL;
|
|
evt->ext_list_token = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* release_event_pool: - Frees memory of an event pool of a host
|
|
* @pool: event_pool to be released
|
|
* @hostdata: ibmvscsi_host_data who owns the even pool
|
|
*
|
|
* Returns zero on success.
|
|
*/
|
|
static void release_event_pool(struct event_pool *pool,
|
|
struct ibmvscsi_host_data *hostdata)
|
|
{
|
|
int i, in_use = 0;
|
|
for (i = 0; i < pool->size; ++i) {
|
|
if (atomic_read(&pool->events[i].free) != 1)
|
|
++in_use;
|
|
if (pool->events[i].ext_list) {
|
|
dma_free_coherent(hostdata->dev,
|
|
SG_ALL * sizeof(struct memory_descriptor),
|
|
pool->events[i].ext_list,
|
|
pool->events[i].ext_list_token);
|
|
}
|
|
}
|
|
if (in_use)
|
|
printk(KERN_WARNING
|
|
"ibmvscsi: releasing event pool with %d "
|
|
"events still in use?\n", in_use);
|
|
kfree(pool->events);
|
|
dma_free_coherent(hostdata->dev,
|
|
pool->size * sizeof(*pool->iu_storage),
|
|
pool->iu_storage, pool->iu_token);
|
|
}
|
|
|
|
/**
|
|
* valid_event_struct: - Determines if event is valid.
|
|
* @pool: event_pool that contains the event
|
|
* @evt: srp_event_struct to be checked for validity
|
|
*
|
|
* Returns zero if event is invalid, one otherwise.
|
|
*/
|
|
static int valid_event_struct(struct event_pool *pool,
|
|
struct srp_event_struct *evt)
|
|
{
|
|
int index = evt - pool->events;
|
|
if (index < 0 || index >= pool->size) /* outside of bounds */
|
|
return 0;
|
|
if (evt != pool->events + index) /* unaligned */
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsi_free-event_struct: - Changes status of event to "free"
|
|
* @pool: event_pool that contains the event
|
|
* @evt: srp_event_struct to be modified
|
|
*
|
|
*/
|
|
static void free_event_struct(struct event_pool *pool,
|
|
struct srp_event_struct *evt)
|
|
{
|
|
if (!valid_event_struct(pool, evt)) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: Freeing invalid event_struct %p "
|
|
"(not in pool %p)\n", evt, pool->events);
|
|
return;
|
|
}
|
|
if (atomic_inc_return(&evt->free) != 1) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: Freeing event_struct %p "
|
|
"which is not in use!\n", evt);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* get_evt_struct: - Gets the next free event in pool
|
|
* @pool: event_pool that contains the events to be searched
|
|
*
|
|
* Returns the next event in "free" state, and NULL if none are free.
|
|
* Note that no synchronization is done here, we assume the host_lock
|
|
* will syncrhonze things.
|
|
*/
|
|
static struct srp_event_struct *get_event_struct(struct event_pool *pool)
|
|
{
|
|
int i;
|
|
int poolsize = pool->size;
|
|
int offset = pool->next;
|
|
|
|
for (i = 0; i < poolsize; i++) {
|
|
offset = (offset + 1) % poolsize;
|
|
if (!atomic_dec_if_positive(&pool->events[offset].free)) {
|
|
pool->next = offset;
|
|
return &pool->events[offset];
|
|
}
|
|
}
|
|
|
|
printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* init_event_struct: Initialize fields in an event struct that are always
|
|
* required.
|
|
* @evt: The event
|
|
* @done: Routine to call when the event is responded to
|
|
* @format: SRP or MAD format
|
|
* @timeout: timeout value set in the CRQ
|
|
*/
|
|
static void init_event_struct(struct srp_event_struct *evt_struct,
|
|
void (*done) (struct srp_event_struct *),
|
|
u8 format,
|
|
int timeout)
|
|
{
|
|
evt_struct->cmnd = NULL;
|
|
evt_struct->cmnd_done = NULL;
|
|
evt_struct->sync_srp = NULL;
|
|
evt_struct->crq.format = format;
|
|
evt_struct->crq.timeout = timeout;
|
|
evt_struct->done = done;
|
|
}
|
|
|
|
/* ------------------------------------------------------------
|
|
* Routines for receiving SCSI responses from the hosting partition
|
|
*/
|
|
|
|
/**
|
|
* set_srp_direction: Set the fields in the srp related to data
|
|
* direction and number of buffers based on the direction in
|
|
* the scsi_cmnd and the number of buffers
|
|
*/
|
|
static void set_srp_direction(struct scsi_cmnd *cmd,
|
|
struct srp_cmd *srp_cmd,
|
|
int numbuf)
|
|
{
|
|
if (numbuf == 0)
|
|
return;
|
|
|
|
if (numbuf == 1) {
|
|
if (cmd->sc_data_direction == DMA_TO_DEVICE)
|
|
srp_cmd->data_out_format = SRP_DIRECT_BUFFER;
|
|
else
|
|
srp_cmd->data_in_format = SRP_DIRECT_BUFFER;
|
|
} else {
|
|
if (cmd->sc_data_direction == DMA_TO_DEVICE) {
|
|
srp_cmd->data_out_format = SRP_INDIRECT_BUFFER;
|
|
srp_cmd->data_out_count =
|
|
numbuf < MAX_INDIRECT_BUFS ?
|
|
numbuf: MAX_INDIRECT_BUFS;
|
|
} else {
|
|
srp_cmd->data_in_format = SRP_INDIRECT_BUFFER;
|
|
srp_cmd->data_in_count =
|
|
numbuf < MAX_INDIRECT_BUFS ?
|
|
numbuf: MAX_INDIRECT_BUFS;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void unmap_sg_list(int num_entries,
|
|
struct device *dev,
|
|
struct memory_descriptor *md)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < num_entries; ++i) {
|
|
dma_unmap_single(dev,
|
|
md[i].virtual_address,
|
|
md[i].length, DMA_BIDIRECTIONAL);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
|
|
* @cmd: srp_cmd whose additional_data member will be unmapped
|
|
* @dev: device for which the memory is mapped
|
|
*
|
|
*/
|
|
static void unmap_cmd_data(struct srp_cmd *cmd,
|
|
struct srp_event_struct *evt_struct,
|
|
struct device *dev)
|
|
{
|
|
if ((cmd->data_out_format == SRP_NO_BUFFER) &&
|
|
(cmd->data_in_format == SRP_NO_BUFFER))
|
|
return;
|
|
else if ((cmd->data_out_format == SRP_DIRECT_BUFFER) ||
|
|
(cmd->data_in_format == SRP_DIRECT_BUFFER)) {
|
|
struct memory_descriptor *data =
|
|
(struct memory_descriptor *)cmd->additional_data;
|
|
dma_unmap_single(dev, data->virtual_address, data->length,
|
|
DMA_BIDIRECTIONAL);
|
|
} else {
|
|
struct indirect_descriptor *indirect =
|
|
(struct indirect_descriptor *)cmd->additional_data;
|
|
int num_mapped = indirect->head.length /
|
|
sizeof(indirect->list[0]);
|
|
|
|
if (num_mapped <= MAX_INDIRECT_BUFS) {
|
|
unmap_sg_list(num_mapped, dev, &indirect->list[0]);
|
|
return;
|
|
}
|
|
|
|
unmap_sg_list(num_mapped, dev, evt_struct->ext_list);
|
|
}
|
|
}
|
|
|
|
static int map_sg_list(int num_entries,
|
|
struct scatterlist *sg,
|
|
struct memory_descriptor *md)
|
|
{
|
|
int i;
|
|
u64 total_length = 0;
|
|
|
|
for (i = 0; i < num_entries; ++i) {
|
|
struct memory_descriptor *descr = md + i;
|
|
struct scatterlist *sg_entry = &sg[i];
|
|
descr->virtual_address = sg_dma_address(sg_entry);
|
|
descr->length = sg_dma_len(sg_entry);
|
|
descr->memory_handle = 0;
|
|
total_length += sg_dma_len(sg_entry);
|
|
}
|
|
return total_length;
|
|
}
|
|
|
|
/**
|
|
* map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
|
|
* @cmd: Scsi_Cmnd with the scatterlist
|
|
* @srp_cmd: srp_cmd that contains the memory descriptor
|
|
* @dev: device for which to map dma memory
|
|
*
|
|
* Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
|
|
* Returns 1 on success.
|
|
*/
|
|
static int map_sg_data(struct scsi_cmnd *cmd,
|
|
struct srp_event_struct *evt_struct,
|
|
struct srp_cmd *srp_cmd, struct device *dev)
|
|
{
|
|
|
|
int sg_mapped;
|
|
u64 total_length = 0;
|
|
struct scatterlist *sg = cmd->request_buffer;
|
|
struct memory_descriptor *data =
|
|
(struct memory_descriptor *)srp_cmd->additional_data;
|
|
struct indirect_descriptor *indirect =
|
|
(struct indirect_descriptor *)data;
|
|
|
|
sg_mapped = dma_map_sg(dev, sg, cmd->use_sg, DMA_BIDIRECTIONAL);
|
|
|
|
if (sg_mapped == 0)
|
|
return 0;
|
|
|
|
set_srp_direction(cmd, srp_cmd, sg_mapped);
|
|
|
|
/* special case; we can use a single direct descriptor */
|
|
if (sg_mapped == 1) {
|
|
data->virtual_address = sg_dma_address(&sg[0]);
|
|
data->length = sg_dma_len(&sg[0]);
|
|
data->memory_handle = 0;
|
|
return 1;
|
|
}
|
|
|
|
if (sg_mapped > SG_ALL) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: More than %d mapped sg entries, got %d\n",
|
|
SG_ALL, sg_mapped);
|
|
return 0;
|
|
}
|
|
|
|
indirect->head.virtual_address = 0;
|
|
indirect->head.length = sg_mapped * sizeof(indirect->list[0]);
|
|
indirect->head.memory_handle = 0;
|
|
|
|
if (sg_mapped <= MAX_INDIRECT_BUFS) {
|
|
total_length = map_sg_list(sg_mapped, sg, &indirect->list[0]);
|
|
indirect->total_length = total_length;
|
|
return 1;
|
|
}
|
|
|
|
/* get indirect table */
|
|
if (!evt_struct->ext_list) {
|
|
evt_struct->ext_list =(struct memory_descriptor*)
|
|
dma_alloc_coherent(dev,
|
|
SG_ALL * sizeof(struct memory_descriptor),
|
|
&evt_struct->ext_list_token, 0);
|
|
if (!evt_struct->ext_list) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: Can't allocate memory for indirect table\n");
|
|
return 0;
|
|
|
|
}
|
|
}
|
|
|
|
total_length = map_sg_list(sg_mapped, sg, evt_struct->ext_list);
|
|
|
|
indirect->total_length = total_length;
|
|
indirect->head.virtual_address = evt_struct->ext_list_token;
|
|
indirect->head.length = sg_mapped * sizeof(indirect->list[0]);
|
|
memcpy(indirect->list, evt_struct->ext_list,
|
|
MAX_INDIRECT_BUFS * sizeof(struct memory_descriptor));
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* map_single_data: - Maps memory and initializes memory decriptor fields
|
|
* @cmd: struct scsi_cmnd with the memory to be mapped
|
|
* @srp_cmd: srp_cmd that contains the memory descriptor
|
|
* @dev: device for which to map dma memory
|
|
*
|
|
* Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
|
|
* Returns 1 on success.
|
|
*/
|
|
static int map_single_data(struct scsi_cmnd *cmd,
|
|
struct srp_cmd *srp_cmd, struct device *dev)
|
|
{
|
|
struct memory_descriptor *data =
|
|
(struct memory_descriptor *)srp_cmd->additional_data;
|
|
|
|
data->virtual_address =
|
|
dma_map_single(dev, cmd->request_buffer,
|
|
cmd->request_bufflen,
|
|
DMA_BIDIRECTIONAL);
|
|
if (dma_mapping_error(data->virtual_address)) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: Unable to map request_buffer for command!\n");
|
|
return 0;
|
|
}
|
|
data->length = cmd->request_bufflen;
|
|
data->memory_handle = 0;
|
|
|
|
set_srp_direction(cmd, srp_cmd, 1);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* map_data_for_srp_cmd: - Calls functions to map data for srp cmds
|
|
* @cmd: struct scsi_cmnd with the memory to be mapped
|
|
* @srp_cmd: srp_cmd that contains the memory descriptor
|
|
* @dev: dma device for which to map dma memory
|
|
*
|
|
* Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
|
|
* Returns 1 on success.
|
|
*/
|
|
static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
|
|
struct srp_event_struct *evt_struct,
|
|
struct srp_cmd *srp_cmd, struct device *dev)
|
|
{
|
|
switch (cmd->sc_data_direction) {
|
|
case DMA_FROM_DEVICE:
|
|
case DMA_TO_DEVICE:
|
|
break;
|
|
case DMA_NONE:
|
|
return 1;
|
|
case DMA_BIDIRECTIONAL:
|
|
printk(KERN_ERR
|
|
"ibmvscsi: Can't map DMA_BIDIRECTIONAL to read/write\n");
|
|
return 0;
|
|
default:
|
|
printk(KERN_ERR
|
|
"ibmvscsi: Unknown data direction 0x%02x; can't map!\n",
|
|
cmd->sc_data_direction);
|
|
return 0;
|
|
}
|
|
|
|
if (!cmd->request_buffer)
|
|
return 1;
|
|
if (cmd->use_sg)
|
|
return map_sg_data(cmd, evt_struct, srp_cmd, dev);
|
|
return map_single_data(cmd, srp_cmd, dev);
|
|
}
|
|
|
|
/* ------------------------------------------------------------
|
|
* Routines for sending and receiving SRPs
|
|
*/
|
|
/**
|
|
* ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
|
|
* @evt_struct: evt_struct to be sent
|
|
* @hostdata: ibmvscsi_host_data of host
|
|
*
|
|
* Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
|
|
* Note that this routine assumes that host_lock is held for synchronization
|
|
*/
|
|
static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
|
|
struct ibmvscsi_host_data *hostdata)
|
|
{
|
|
u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
|
|
int rc;
|
|
|
|
/* If we have exhausted our request limit, just fail this request.
|
|
* Note that there are rare cases involving driver generated requests
|
|
* (such as task management requests) that the mid layer may think we
|
|
* can handle more requests (can_queue) when we actually can't
|
|
*/
|
|
if ((evt_struct->crq.format == VIOSRP_SRP_FORMAT) &&
|
|
(atomic_dec_if_positive(&hostdata->request_limit) < 0))
|
|
goto send_error;
|
|
|
|
/* Copy the IU into the transfer area */
|
|
*evt_struct->xfer_iu = evt_struct->iu;
|
|
evt_struct->xfer_iu->srp.generic.tag = (u64)evt_struct;
|
|
|
|
/* Add this to the sent list. We need to do this
|
|
* before we actually send
|
|
* in case it comes back REALLY fast
|
|
*/
|
|
list_add_tail(&evt_struct->list, &hostdata->sent);
|
|
|
|
if ((rc =
|
|
ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
|
|
list_del(&evt_struct->list);
|
|
|
|
printk(KERN_ERR "ibmvscsi: send error %d\n",
|
|
rc);
|
|
goto send_error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
send_error:
|
|
unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
|
|
|
|
free_event_struct(&hostdata->pool, evt_struct);
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
}
|
|
|
|
/**
|
|
* handle_cmd_rsp: - Handle responses from commands
|
|
* @evt_struct: srp_event_struct to be handled
|
|
*
|
|
* Used as a callback by when sending scsi cmds.
|
|
* Gets called by ibmvscsi_handle_crq()
|
|
*/
|
|
static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
|
|
{
|
|
struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
|
|
struct scsi_cmnd *cmnd = evt_struct->cmnd;
|
|
|
|
if (unlikely(rsp->type != SRP_RSP_TYPE)) {
|
|
if (printk_ratelimit())
|
|
printk(KERN_WARNING
|
|
"ibmvscsi: bad SRP RSP type %d\n",
|
|
rsp->type);
|
|
}
|
|
|
|
if (cmnd) {
|
|
cmnd->result = rsp->status;
|
|
if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
|
|
memcpy(cmnd->sense_buffer,
|
|
rsp->sense_and_response_data,
|
|
rsp->sense_data_list_length);
|
|
unmap_cmd_data(&evt_struct->iu.srp.cmd,
|
|
evt_struct,
|
|
evt_struct->hostdata->dev);
|
|
|
|
if (rsp->doover)
|
|
cmnd->resid = rsp->data_out_residual_count;
|
|
else if (rsp->diover)
|
|
cmnd->resid = rsp->data_in_residual_count;
|
|
}
|
|
|
|
if (evt_struct->cmnd_done)
|
|
evt_struct->cmnd_done(cmnd);
|
|
}
|
|
|
|
/**
|
|
* lun_from_dev: - Returns the lun of the scsi device
|
|
* @dev: struct scsi_device
|
|
*
|
|
*/
|
|
static inline u16 lun_from_dev(struct scsi_device *dev)
|
|
{
|
|
return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsi_queue: - The queuecommand function of the scsi template
|
|
* @cmd: struct scsi_cmnd to be executed
|
|
* @done: Callback function to be called when cmd is completed
|
|
*/
|
|
static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
|
|
void (*done) (struct scsi_cmnd *))
|
|
{
|
|
struct srp_cmd *srp_cmd;
|
|
struct srp_event_struct *evt_struct;
|
|
struct indirect_descriptor *indirect;
|
|
struct ibmvscsi_host_data *hostdata =
|
|
(struct ibmvscsi_host_data *)&cmnd->device->host->hostdata;
|
|
u16 lun = lun_from_dev(cmnd->device);
|
|
|
|
evt_struct = get_event_struct(&hostdata->pool);
|
|
if (!evt_struct)
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
|
|
/* Set up the actual SRP IU */
|
|
srp_cmd = &evt_struct->iu.srp.cmd;
|
|
memset(srp_cmd, 0x00, sizeof(*srp_cmd));
|
|
srp_cmd->type = SRP_CMD_TYPE;
|
|
memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd));
|
|
srp_cmd->lun = ((u64) lun) << 48;
|
|
|
|
if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
|
|
printk(KERN_ERR "ibmvscsi: couldn't convert cmd to srp_cmd\n");
|
|
free_event_struct(&hostdata->pool, evt_struct);
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
}
|
|
|
|
init_event_struct(evt_struct,
|
|
handle_cmd_rsp,
|
|
VIOSRP_SRP_FORMAT,
|
|
cmnd->timeout_per_command/HZ);
|
|
|
|
evt_struct->cmnd = cmnd;
|
|
evt_struct->cmnd_done = done;
|
|
|
|
/* Fix up dma address of the buffer itself */
|
|
indirect = (struct indirect_descriptor *)srp_cmd->additional_data;
|
|
if (((srp_cmd->data_out_format == SRP_INDIRECT_BUFFER) ||
|
|
(srp_cmd->data_in_format == SRP_INDIRECT_BUFFER)) &&
|
|
(indirect->head.virtual_address == 0)) {
|
|
indirect->head.virtual_address = evt_struct->crq.IU_data_ptr +
|
|
offsetof(struct srp_cmd, additional_data) +
|
|
offsetof(struct indirect_descriptor, list);
|
|
}
|
|
|
|
return ibmvscsi_send_srp_event(evt_struct, hostdata);
|
|
}
|
|
|
|
/* ------------------------------------------------------------
|
|
* Routines for driver initialization
|
|
*/
|
|
/**
|
|
* adapter_info_rsp: - Handle response to MAD adapter info request
|
|
* @evt_struct: srp_event_struct with the response
|
|
*
|
|
* Used as a "done" callback by when sending adapter_info. Gets called
|
|
* by ibmvscsi_handle_crq()
|
|
*/
|
|
static void adapter_info_rsp(struct srp_event_struct *evt_struct)
|
|
{
|
|
struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
|
|
dma_unmap_single(hostdata->dev,
|
|
evt_struct->iu.mad.adapter_info.buffer,
|
|
evt_struct->iu.mad.adapter_info.common.length,
|
|
DMA_BIDIRECTIONAL);
|
|
|
|
if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
|
|
printk("ibmvscsi: error %d getting adapter info\n",
|
|
evt_struct->xfer_iu->mad.adapter_info.common.status);
|
|
} else {
|
|
printk("ibmvscsi: host srp version: %s, "
|
|
"host partition %s (%d), OS %d, max io %u\n",
|
|
hostdata->madapter_info.srp_version,
|
|
hostdata->madapter_info.partition_name,
|
|
hostdata->madapter_info.partition_number,
|
|
hostdata->madapter_info.os_type,
|
|
hostdata->madapter_info.port_max_txu[0]);
|
|
|
|
if (hostdata->madapter_info.port_max_txu[0])
|
|
hostdata->host->max_sectors =
|
|
hostdata->madapter_info.port_max_txu[0] >> 9;
|
|
|
|
if (hostdata->madapter_info.os_type == 3 &&
|
|
strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
|
|
printk("ibmvscsi: host (Ver. %s) doesn't support large"
|
|
"transfers\n",
|
|
hostdata->madapter_info.srp_version);
|
|
printk("ibmvscsi: limiting scatterlists to %d\n",
|
|
MAX_INDIRECT_BUFS);
|
|
hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* send_mad_adapter_info: - Sends the mad adapter info request
|
|
* and stores the result so it can be retrieved with
|
|
* sysfs. We COULD consider causing a failure if the
|
|
* returned SRP version doesn't match ours.
|
|
* @hostdata: ibmvscsi_host_data of host
|
|
*
|
|
* Returns zero if successful.
|
|
*/
|
|
static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
|
|
{
|
|
struct viosrp_adapter_info *req;
|
|
struct srp_event_struct *evt_struct;
|
|
|
|
evt_struct = get_event_struct(&hostdata->pool);
|
|
if (!evt_struct) {
|
|
printk(KERN_ERR "ibmvscsi: couldn't allocate an event "
|
|
"for ADAPTER_INFO_REQ!\n");
|
|
return;
|
|
}
|
|
|
|
init_event_struct(evt_struct,
|
|
adapter_info_rsp,
|
|
VIOSRP_MAD_FORMAT,
|
|
init_timeout * HZ);
|
|
|
|
req = &evt_struct->iu.mad.adapter_info;
|
|
memset(req, 0x00, sizeof(*req));
|
|
|
|
req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
|
|
req->common.length = sizeof(hostdata->madapter_info);
|
|
req->buffer = dma_map_single(hostdata->dev,
|
|
&hostdata->madapter_info,
|
|
sizeof(hostdata->madapter_info),
|
|
DMA_BIDIRECTIONAL);
|
|
|
|
if (dma_mapping_error(req->buffer)) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: Unable to map request_buffer "
|
|
"for adapter_info!\n");
|
|
free_event_struct(&hostdata->pool, evt_struct);
|
|
return;
|
|
}
|
|
|
|
if (ibmvscsi_send_srp_event(evt_struct, hostdata))
|
|
printk(KERN_ERR "ibmvscsi: couldn't send ADAPTER_INFO_REQ!\n");
|
|
};
|
|
|
|
/**
|
|
* login_rsp: - Handle response to SRP login request
|
|
* @evt_struct: srp_event_struct with the response
|
|
*
|
|
* Used as a "done" callback by when sending srp_login. Gets called
|
|
* by ibmvscsi_handle_crq()
|
|
*/
|
|
static void login_rsp(struct srp_event_struct *evt_struct)
|
|
{
|
|
struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
|
|
switch (evt_struct->xfer_iu->srp.generic.type) {
|
|
case SRP_LOGIN_RSP_TYPE: /* it worked! */
|
|
break;
|
|
case SRP_LOGIN_REJ_TYPE: /* refused! */
|
|
printk(KERN_INFO "ibmvscsi: SRP_LOGIN_REJ reason %u\n",
|
|
evt_struct->xfer_iu->srp.login_rej.reason);
|
|
/* Login failed. */
|
|
atomic_set(&hostdata->request_limit, -1);
|
|
return;
|
|
default:
|
|
printk(KERN_ERR
|
|
"ibmvscsi: Invalid login response typecode 0x%02x!\n",
|
|
evt_struct->xfer_iu->srp.generic.type);
|
|
/* Login failed. */
|
|
atomic_set(&hostdata->request_limit, -1);
|
|
return;
|
|
}
|
|
|
|
printk(KERN_INFO "ibmvscsi: SRP_LOGIN succeeded\n");
|
|
|
|
if (evt_struct->xfer_iu->srp.login_rsp.request_limit_delta >
|
|
(max_requests - 2))
|
|
evt_struct->xfer_iu->srp.login_rsp.request_limit_delta =
|
|
max_requests - 2;
|
|
|
|
/* Now we know what the real request-limit is */
|
|
atomic_set(&hostdata->request_limit,
|
|
evt_struct->xfer_iu->srp.login_rsp.request_limit_delta);
|
|
|
|
hostdata->host->can_queue =
|
|
evt_struct->xfer_iu->srp.login_rsp.request_limit_delta - 2;
|
|
|
|
if (hostdata->host->can_queue < 1) {
|
|
printk(KERN_ERR "ibmvscsi: Invalid request_limit_delta\n");
|
|
return;
|
|
}
|
|
|
|
/* If we had any pending I/Os, kick them */
|
|
scsi_unblock_requests(hostdata->host);
|
|
|
|
send_mad_adapter_info(hostdata);
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* send_srp_login: - Sends the srp login
|
|
* @hostdata: ibmvscsi_host_data of host
|
|
*
|
|
* Returns zero if successful.
|
|
*/
|
|
static int send_srp_login(struct ibmvscsi_host_data *hostdata)
|
|
{
|
|
int rc;
|
|
unsigned long flags;
|
|
struct srp_login_req *login;
|
|
struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
|
|
if (!evt_struct) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: couldn't allocate an event for login req!\n");
|
|
return FAILED;
|
|
}
|
|
|
|
init_event_struct(evt_struct,
|
|
login_rsp,
|
|
VIOSRP_SRP_FORMAT,
|
|
init_timeout * HZ);
|
|
|
|
login = &evt_struct->iu.srp.login_req;
|
|
memset(login, 0x00, sizeof(struct srp_login_req));
|
|
login->type = SRP_LOGIN_REQ_TYPE;
|
|
login->max_requested_initiator_to_target_iulen = sizeof(union srp_iu);
|
|
login->required_buffer_formats = 0x0006;
|
|
|
|
/* Start out with a request limit of 1, since this is negotiated in
|
|
* the login request we are just sending
|
|
*/
|
|
atomic_set(&hostdata->request_limit, 1);
|
|
|
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
|
rc = ibmvscsi_send_srp_event(evt_struct, hostdata);
|
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
|
return rc;
|
|
};
|
|
|
|
/**
|
|
* sync_completion: Signal that a synchronous command has completed
|
|
* Note that after returning from this call, the evt_struct is freed.
|
|
* the caller waiting on this completion shouldn't touch the evt_struct
|
|
* again.
|
|
*/
|
|
static void sync_completion(struct srp_event_struct *evt_struct)
|
|
{
|
|
/* copy the response back */
|
|
if (evt_struct->sync_srp)
|
|
*evt_struct->sync_srp = *evt_struct->xfer_iu;
|
|
|
|
complete(&evt_struct->comp);
|
|
}
|
|
|
|
/**
|
|
* ibmvscsi_abort: Abort a command...from scsi host template
|
|
* send this over to the server and wait synchronously for the response
|
|
*/
|
|
static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
|
|
{
|
|
struct ibmvscsi_host_data *hostdata =
|
|
(struct ibmvscsi_host_data *)cmd->device->host->hostdata;
|
|
struct srp_tsk_mgmt *tsk_mgmt;
|
|
struct srp_event_struct *evt;
|
|
struct srp_event_struct *tmp_evt, *found_evt;
|
|
union viosrp_iu srp_rsp;
|
|
int rsp_rc;
|
|
unsigned long flags;
|
|
u16 lun = lun_from_dev(cmd->device);
|
|
|
|
/* First, find this command in our sent list so we can figure
|
|
* out the correct tag
|
|
*/
|
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
|
found_evt = NULL;
|
|
list_for_each_entry(tmp_evt, &hostdata->sent, list) {
|
|
if (tmp_evt->cmnd == cmd) {
|
|
found_evt = tmp_evt;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found_evt) {
|
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
|
return FAILED;
|
|
}
|
|
|
|
evt = get_event_struct(&hostdata->pool);
|
|
if (evt == NULL) {
|
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
|
printk(KERN_ERR "ibmvscsi: failed to allocate abort event\n");
|
|
return FAILED;
|
|
}
|
|
|
|
init_event_struct(evt,
|
|
sync_completion,
|
|
VIOSRP_SRP_FORMAT,
|
|
init_timeout * HZ);
|
|
|
|
tsk_mgmt = &evt->iu.srp.tsk_mgmt;
|
|
|
|
/* Set up an abort SRP command */
|
|
memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
|
|
tsk_mgmt->type = SRP_TSK_MGMT_TYPE;
|
|
tsk_mgmt->lun = ((u64) lun) << 48;
|
|
tsk_mgmt->task_mgmt_flags = 0x01; /* ABORT TASK */
|
|
tsk_mgmt->managed_task_tag = (u64) found_evt;
|
|
|
|
printk(KERN_INFO "ibmvscsi: aborting command. lun 0x%lx, tag 0x%lx\n",
|
|
tsk_mgmt->lun, tsk_mgmt->managed_task_tag);
|
|
|
|
evt->sync_srp = &srp_rsp;
|
|
init_completion(&evt->comp);
|
|
rsp_rc = ibmvscsi_send_srp_event(evt, hostdata);
|
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
|
if (rsp_rc != 0) {
|
|
printk(KERN_ERR "ibmvscsi: failed to send abort() event\n");
|
|
return FAILED;
|
|
}
|
|
|
|
wait_for_completion(&evt->comp);
|
|
|
|
/* make sure we got a good response */
|
|
if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) {
|
|
if (printk_ratelimit())
|
|
printk(KERN_WARNING
|
|
"ibmvscsi: abort bad SRP RSP type %d\n",
|
|
srp_rsp.srp.generic.type);
|
|
return FAILED;
|
|
}
|
|
|
|
if (srp_rsp.srp.rsp.rspvalid)
|
|
rsp_rc = *((int *)srp_rsp.srp.rsp.sense_and_response_data);
|
|
else
|
|
rsp_rc = srp_rsp.srp.rsp.status;
|
|
|
|
if (rsp_rc) {
|
|
if (printk_ratelimit())
|
|
printk(KERN_WARNING
|
|
"ibmvscsi: abort code %d for task tag 0x%lx\n",
|
|
rsp_rc,
|
|
tsk_mgmt->managed_task_tag);
|
|
return FAILED;
|
|
}
|
|
|
|
/* Because we dropped the spinlock above, it's possible
|
|
* The event is no longer in our list. Make sure it didn't
|
|
* complete while we were aborting
|
|
*/
|
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
|
found_evt = NULL;
|
|
list_for_each_entry(tmp_evt, &hostdata->sent, list) {
|
|
if (tmp_evt->cmnd == cmd) {
|
|
found_evt = tmp_evt;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found_evt == NULL) {
|
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
|
printk(KERN_INFO
|
|
"ibmvscsi: aborted task tag 0x%lx completed\n",
|
|
tsk_mgmt->managed_task_tag);
|
|
return SUCCESS;
|
|
}
|
|
|
|
printk(KERN_INFO
|
|
"ibmvscsi: successfully aborted task tag 0x%lx\n",
|
|
tsk_mgmt->managed_task_tag);
|
|
|
|
cmd->result = (DID_ABORT << 16);
|
|
list_del(&found_evt->list);
|
|
unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
|
|
found_evt->hostdata->dev);
|
|
free_event_struct(&found_evt->hostdata->pool, found_evt);
|
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
|
atomic_inc(&hostdata->request_limit);
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
|
|
* template send this over to the server and wait synchronously for the
|
|
* response
|
|
*/
|
|
static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
|
|
{
|
|
struct ibmvscsi_host_data *hostdata =
|
|
(struct ibmvscsi_host_data *)cmd->device->host->hostdata;
|
|
|
|
struct srp_tsk_mgmt *tsk_mgmt;
|
|
struct srp_event_struct *evt;
|
|
struct srp_event_struct *tmp_evt, *pos;
|
|
union viosrp_iu srp_rsp;
|
|
int rsp_rc;
|
|
unsigned long flags;
|
|
u16 lun = lun_from_dev(cmd->device);
|
|
|
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
|
evt = get_event_struct(&hostdata->pool);
|
|
if (evt == NULL) {
|
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
|
printk(KERN_ERR "ibmvscsi: failed to allocate reset event\n");
|
|
return FAILED;
|
|
}
|
|
|
|
init_event_struct(evt,
|
|
sync_completion,
|
|
VIOSRP_SRP_FORMAT,
|
|
init_timeout * HZ);
|
|
|
|
tsk_mgmt = &evt->iu.srp.tsk_mgmt;
|
|
|
|
/* Set up a lun reset SRP command */
|
|
memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
|
|
tsk_mgmt->type = SRP_TSK_MGMT_TYPE;
|
|
tsk_mgmt->lun = ((u64) lun) << 48;
|
|
tsk_mgmt->task_mgmt_flags = 0x08; /* LUN RESET */
|
|
|
|
printk(KERN_INFO "ibmvscsi: resetting device. lun 0x%lx\n",
|
|
tsk_mgmt->lun);
|
|
|
|
evt->sync_srp = &srp_rsp;
|
|
init_completion(&evt->comp);
|
|
rsp_rc = ibmvscsi_send_srp_event(evt, hostdata);
|
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
|
if (rsp_rc != 0) {
|
|
printk(KERN_ERR "ibmvscsi: failed to send reset event\n");
|
|
return FAILED;
|
|
}
|
|
|
|
wait_for_completion(&evt->comp);
|
|
|
|
/* make sure we got a good response */
|
|
if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) {
|
|
if (printk_ratelimit())
|
|
printk(KERN_WARNING
|
|
"ibmvscsi: reset bad SRP RSP type %d\n",
|
|
srp_rsp.srp.generic.type);
|
|
return FAILED;
|
|
}
|
|
|
|
if (srp_rsp.srp.rsp.rspvalid)
|
|
rsp_rc = *((int *)srp_rsp.srp.rsp.sense_and_response_data);
|
|
else
|
|
rsp_rc = srp_rsp.srp.rsp.status;
|
|
|
|
if (rsp_rc) {
|
|
if (printk_ratelimit())
|
|
printk(KERN_WARNING
|
|
"ibmvscsi: reset code %d for task tag 0x%lx\n",
|
|
rsp_rc,
|
|
tsk_mgmt->managed_task_tag);
|
|
return FAILED;
|
|
}
|
|
|
|
/* We need to find all commands for this LUN that have not yet been
|
|
* responded to, and fail them with DID_RESET
|
|
*/
|
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
|
list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
|
|
if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
|
|
if (tmp_evt->cmnd)
|
|
tmp_evt->cmnd->result = (DID_RESET << 16);
|
|
list_del(&tmp_evt->list);
|
|
unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
|
|
tmp_evt->hostdata->dev);
|
|
free_event_struct(&tmp_evt->hostdata->pool,
|
|
tmp_evt);
|
|
atomic_inc(&hostdata->request_limit);
|
|
if (tmp_evt->cmnd_done)
|
|
tmp_evt->cmnd_done(tmp_evt->cmnd);
|
|
else if (tmp_evt->done)
|
|
tmp_evt->done(tmp_evt);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* purge_requests: Our virtual adapter just shut down. purge any sent requests
|
|
* @hostdata: the adapter
|
|
*/
|
|
static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
|
|
{
|
|
struct srp_event_struct *tmp_evt, *pos;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(hostdata->host->host_lock, flags);
|
|
list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
|
|
list_del(&tmp_evt->list);
|
|
if (tmp_evt->cmnd) {
|
|
tmp_evt->cmnd->result = (error_code << 16);
|
|
unmap_cmd_data(&tmp_evt->iu.srp.cmd,
|
|
tmp_evt,
|
|
tmp_evt->hostdata->dev);
|
|
if (tmp_evt->cmnd_done)
|
|
tmp_evt->cmnd_done(tmp_evt->cmnd);
|
|
} else {
|
|
if (tmp_evt->done) {
|
|
tmp_evt->done(tmp_evt);
|
|
}
|
|
}
|
|
free_event_struct(&tmp_evt->hostdata->pool, tmp_evt);
|
|
}
|
|
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
|
|
* @crq: Command/Response queue
|
|
* @hostdata: ibmvscsi_host_data of host
|
|
*
|
|
*/
|
|
void ibmvscsi_handle_crq(struct viosrp_crq *crq,
|
|
struct ibmvscsi_host_data *hostdata)
|
|
{
|
|
unsigned long flags;
|
|
struct srp_event_struct *evt_struct =
|
|
(struct srp_event_struct *)crq->IU_data_ptr;
|
|
switch (crq->valid) {
|
|
case 0xC0: /* initialization */
|
|
switch (crq->format) {
|
|
case 0x01: /* Initialization message */
|
|
printk(KERN_INFO "ibmvscsi: partner initialized\n");
|
|
/* Send back a response */
|
|
if (ibmvscsi_send_crq(hostdata,
|
|
0xC002000000000000LL, 0) == 0) {
|
|
/* Now login */
|
|
send_srp_login(hostdata);
|
|
} else {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: Unable to send init rsp\n");
|
|
}
|
|
|
|
break;
|
|
case 0x02: /* Initialization response */
|
|
printk(KERN_INFO
|
|
"ibmvscsi: partner initialization complete\n");
|
|
|
|
/* Now login */
|
|
send_srp_login(hostdata);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "ibmvscsi: unknown crq message type\n");
|
|
}
|
|
return;
|
|
case 0xFF: /* Hypervisor telling us the connection is closed */
|
|
scsi_block_requests(hostdata->host);
|
|
if (crq->format == 0x06) {
|
|
/* We need to re-setup the interpartition connection */
|
|
printk(KERN_INFO
|
|
"ibmvscsi: Re-enabling adapter!\n");
|
|
purge_requests(hostdata, DID_REQUEUE);
|
|
if (ibmvscsi_reenable_crq_queue(&hostdata->queue,
|
|
hostdata) == 0)
|
|
if (ibmvscsi_send_crq(hostdata,
|
|
0xC001000000000000LL, 0))
|
|
printk(KERN_ERR
|
|
"ibmvscsi: transmit error after"
|
|
" enable\n");
|
|
} else {
|
|
printk(KERN_INFO
|
|
"ibmvscsi: Virtual adapter failed rc %d!\n",
|
|
crq->format);
|
|
|
|
atomic_set(&hostdata->request_limit, -1);
|
|
purge_requests(hostdata, DID_ERROR);
|
|
ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
|
|
}
|
|
scsi_unblock_requests(hostdata->host);
|
|
return;
|
|
case 0x80: /* real payload */
|
|
break;
|
|
default:
|
|
printk(KERN_ERR
|
|
"ibmvscsi: got an invalid message type 0x%02x\n",
|
|
crq->valid);
|
|
return;
|
|
}
|
|
|
|
/* The only kind of payload CRQs we should get are responses to
|
|
* things we send. Make sure this response is to something we
|
|
* actually sent
|
|
*/
|
|
if (!valid_event_struct(&hostdata->pool, evt_struct)) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: returned correlation_token 0x%p is invalid!\n",
|
|
(void *)crq->IU_data_ptr);
|
|
return;
|
|
}
|
|
|
|
if (atomic_read(&evt_struct->free)) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: received duplicate correlation_token 0x%p!\n",
|
|
(void *)crq->IU_data_ptr);
|
|
return;
|
|
}
|
|
|
|
if (crq->format == VIOSRP_SRP_FORMAT)
|
|
atomic_add(evt_struct->xfer_iu->srp.rsp.request_limit_delta,
|
|
&hostdata->request_limit);
|
|
|
|
if (evt_struct->done)
|
|
evt_struct->done(evt_struct);
|
|
else
|
|
printk(KERN_ERR
|
|
"ibmvscsi: returned done() is NULL; not running it!\n");
|
|
|
|
/*
|
|
* Lock the host_lock before messing with these structures, since we
|
|
* are running in a task context
|
|
*/
|
|
spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
|
|
list_del(&evt_struct->list);
|
|
free_event_struct(&evt_struct->hostdata->pool, evt_struct);
|
|
spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* ibmvscsi_get_host_config: Send the command to the server to get host
|
|
* configuration data. The data is opaque to us.
|
|
*/
|
|
static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
|
|
unsigned char *buffer, int length)
|
|
{
|
|
struct viosrp_host_config *host_config;
|
|
struct srp_event_struct *evt_struct;
|
|
int rc;
|
|
|
|
evt_struct = get_event_struct(&hostdata->pool);
|
|
if (!evt_struct) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: could't allocate event for HOST_CONFIG!\n");
|
|
return -1;
|
|
}
|
|
|
|
init_event_struct(evt_struct,
|
|
sync_completion,
|
|
VIOSRP_MAD_FORMAT,
|
|
init_timeout * HZ);
|
|
|
|
host_config = &evt_struct->iu.mad.host_config;
|
|
|
|
/* Set up a lun reset SRP command */
|
|
memset(host_config, 0x00, sizeof(*host_config));
|
|
host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
|
|
host_config->common.length = length;
|
|
host_config->buffer = dma_map_single(hostdata->dev, buffer, length,
|
|
DMA_BIDIRECTIONAL);
|
|
|
|
if (dma_mapping_error(host_config->buffer)) {
|
|
printk(KERN_ERR
|
|
"ibmvscsi: dma_mapping error " "getting host config\n");
|
|
free_event_struct(&hostdata->pool, evt_struct);
|
|
return -1;
|
|
}
|
|
|
|
init_completion(&evt_struct->comp);
|
|
rc = ibmvscsi_send_srp_event(evt_struct, hostdata);
|
|
if (rc == 0) {
|
|
wait_for_completion(&evt_struct->comp);
|
|
dma_unmap_single(hostdata->dev, host_config->buffer,
|
|
length, DMA_BIDIRECTIONAL);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* ------------------------------------------------------------
|
|
* sysfs attributes
|
|
*/
|
|
static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf)
|
|
{
|
|
struct Scsi_Host *shost = class_to_shost(class_dev);
|
|
struct ibmvscsi_host_data *hostdata =
|
|
(struct ibmvscsi_host_data *)shost->hostdata;
|
|
int len;
|
|
|
|
len = snprintf(buf, PAGE_SIZE, "%s\n",
|
|
hostdata->madapter_info.srp_version);
|
|
return len;
|
|
}
|
|
|
|
static struct class_device_attribute ibmvscsi_host_srp_version = {
|
|
.attr = {
|
|
.name = "srp_version",
|
|
.mode = S_IRUGO,
|
|
},
|
|
.show = show_host_srp_version,
|
|
};
|
|
|
|
static ssize_t show_host_partition_name(struct class_device *class_dev,
|
|
char *buf)
|
|
{
|
|
struct Scsi_Host *shost = class_to_shost(class_dev);
|
|
struct ibmvscsi_host_data *hostdata =
|
|
(struct ibmvscsi_host_data *)shost->hostdata;
|
|
int len;
|
|
|
|
len = snprintf(buf, PAGE_SIZE, "%s\n",
|
|
hostdata->madapter_info.partition_name);
|
|
return len;
|
|
}
|
|
|
|
static struct class_device_attribute ibmvscsi_host_partition_name = {
|
|
.attr = {
|
|
.name = "partition_name",
|
|
.mode = S_IRUGO,
|
|
},
|
|
.show = show_host_partition_name,
|
|
};
|
|
|
|
static ssize_t show_host_partition_number(struct class_device *class_dev,
|
|
char *buf)
|
|
{
|
|
struct Scsi_Host *shost = class_to_shost(class_dev);
|
|
struct ibmvscsi_host_data *hostdata =
|
|
(struct ibmvscsi_host_data *)shost->hostdata;
|
|
int len;
|
|
|
|
len = snprintf(buf, PAGE_SIZE, "%d\n",
|
|
hostdata->madapter_info.partition_number);
|
|
return len;
|
|
}
|
|
|
|
static struct class_device_attribute ibmvscsi_host_partition_number = {
|
|
.attr = {
|
|
.name = "partition_number",
|
|
.mode = S_IRUGO,
|
|
},
|
|
.show = show_host_partition_number,
|
|
};
|
|
|
|
static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf)
|
|
{
|
|
struct Scsi_Host *shost = class_to_shost(class_dev);
|
|
struct ibmvscsi_host_data *hostdata =
|
|
(struct ibmvscsi_host_data *)shost->hostdata;
|
|
int len;
|
|
|
|
len = snprintf(buf, PAGE_SIZE, "%d\n",
|
|
hostdata->madapter_info.mad_version);
|
|
return len;
|
|
}
|
|
|
|
static struct class_device_attribute ibmvscsi_host_mad_version = {
|
|
.attr = {
|
|
.name = "mad_version",
|
|
.mode = S_IRUGO,
|
|
},
|
|
.show = show_host_mad_version,
|
|
};
|
|
|
|
static ssize_t show_host_os_type(struct class_device *class_dev, char *buf)
|
|
{
|
|
struct Scsi_Host *shost = class_to_shost(class_dev);
|
|
struct ibmvscsi_host_data *hostdata =
|
|
(struct ibmvscsi_host_data *)shost->hostdata;
|
|
int len;
|
|
|
|
len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
|
|
return len;
|
|
}
|
|
|
|
static struct class_device_attribute ibmvscsi_host_os_type = {
|
|
.attr = {
|
|
.name = "os_type",
|
|
.mode = S_IRUGO,
|
|
},
|
|
.show = show_host_os_type,
|
|
};
|
|
|
|
static ssize_t show_host_config(struct class_device *class_dev, char *buf)
|
|
{
|
|
struct Scsi_Host *shost = class_to_shost(class_dev);
|
|
struct ibmvscsi_host_data *hostdata =
|
|
(struct ibmvscsi_host_data *)shost->hostdata;
|
|
|
|
/* returns null-terminated host config data */
|
|
if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
|
|
return strlen(buf);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static struct class_device_attribute ibmvscsi_host_config = {
|
|
.attr = {
|
|
.name = "config",
|
|
.mode = S_IRUGO,
|
|
},
|
|
.show = show_host_config,
|
|
};
|
|
|
|
static struct class_device_attribute *ibmvscsi_attrs[] = {
|
|
&ibmvscsi_host_srp_version,
|
|
&ibmvscsi_host_partition_name,
|
|
&ibmvscsi_host_partition_number,
|
|
&ibmvscsi_host_mad_version,
|
|
&ibmvscsi_host_os_type,
|
|
&ibmvscsi_host_config,
|
|
NULL
|
|
};
|
|
|
|
/* ------------------------------------------------------------
|
|
* SCSI driver registration
|
|
*/
|
|
static struct scsi_host_template driver_template = {
|
|
.module = THIS_MODULE,
|
|
.name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
|
|
.proc_name = "ibmvscsi",
|
|
.queuecommand = ibmvscsi_queuecommand,
|
|
.eh_abort_handler = ibmvscsi_eh_abort_handler,
|
|
.eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
|
|
.cmd_per_lun = 16,
|
|
.can_queue = 1, /* Updated after SRP_LOGIN */
|
|
.this_id = -1,
|
|
.sg_tablesize = SG_ALL,
|
|
.use_clustering = ENABLE_CLUSTERING,
|
|
.shost_attrs = ibmvscsi_attrs,
|
|
};
|
|
|
|
/**
|
|
* Called by bus code for each adapter
|
|
*/
|
|
static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
|
|
{
|
|
struct ibmvscsi_host_data *hostdata;
|
|
struct Scsi_Host *host;
|
|
struct device *dev = &vdev->dev;
|
|
unsigned long wait_switch = 0;
|
|
|
|
vdev->dev.driver_data = NULL;
|
|
|
|
host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
|
|
if (!host) {
|
|
printk(KERN_ERR "ibmvscsi: couldn't allocate host data\n");
|
|
goto scsi_host_alloc_failed;
|
|
}
|
|
|
|
hostdata = (struct ibmvscsi_host_data *)host->hostdata;
|
|
memset(hostdata, 0x00, sizeof(*hostdata));
|
|
INIT_LIST_HEAD(&hostdata->sent);
|
|
hostdata->host = host;
|
|
hostdata->dev = dev;
|
|
atomic_set(&hostdata->request_limit, -1);
|
|
hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */
|
|
|
|
if (ibmvscsi_init_crq_queue(&hostdata->queue, hostdata,
|
|
max_requests) != 0) {
|
|
printk(KERN_ERR "ibmvscsi: couldn't initialize crq\n");
|
|
goto init_crq_failed;
|
|
}
|
|
if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) {
|
|
printk(KERN_ERR "ibmvscsi: couldn't initialize event pool\n");
|
|
goto init_pool_failed;
|
|
}
|
|
|
|
host->max_lun = 8;
|
|
host->max_id = max_id;
|
|
host->max_channel = max_channel;
|
|
|
|
if (scsi_add_host(hostdata->host, hostdata->dev))
|
|
goto add_host_failed;
|
|
|
|
/* Try to send an initialization message. Note that this is allowed
|
|
* to fail if the other end is not acive. In that case we don't
|
|
* want to scan
|
|
*/
|
|
if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0) {
|
|
/*
|
|
* Wait around max init_timeout secs for the adapter to finish
|
|
* initializing. When we are done initializing, we will have a
|
|
* valid request_limit. We don't want Linux scanning before
|
|
* we are ready.
|
|
*/
|
|
for (wait_switch = jiffies + (init_timeout * HZ);
|
|
time_before(jiffies, wait_switch) &&
|
|
atomic_read(&hostdata->request_limit) < 2;) {
|
|
|
|
msleep(10);
|
|
}
|
|
|
|
/* if we now have a valid request_limit, initiate a scan */
|
|
if (atomic_read(&hostdata->request_limit) > 0)
|
|
scsi_scan_host(host);
|
|
}
|
|
|
|
vdev->dev.driver_data = hostdata;
|
|
return 0;
|
|
|
|
add_host_failed:
|
|
release_event_pool(&hostdata->pool, hostdata);
|
|
init_pool_failed:
|
|
ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests);
|
|
init_crq_failed:
|
|
scsi_host_put(host);
|
|
scsi_host_alloc_failed:
|
|
return -1;
|
|
}
|
|
|
|
static int ibmvscsi_remove(struct vio_dev *vdev)
|
|
{
|
|
struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data;
|
|
release_event_pool(&hostdata->pool, hostdata);
|
|
ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
|
|
max_requests);
|
|
|
|
scsi_remove_host(hostdata->host);
|
|
scsi_host_put(hostdata->host);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
|
|
* support.
|
|
*/
|
|
static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
|
|
{"vscsi", "IBM,v-scsi"},
|
|
{ "", "" }
|
|
};
|
|
MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
|
|
|
|
static struct vio_driver ibmvscsi_driver = {
|
|
.id_table = ibmvscsi_device_table,
|
|
.probe = ibmvscsi_probe,
|
|
.remove = ibmvscsi_remove,
|
|
.driver = {
|
|
.name = "ibmvscsi",
|
|
.owner = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
int __init ibmvscsi_module_init(void)
|
|
{
|
|
return vio_register_driver(&ibmvscsi_driver);
|
|
}
|
|
|
|
void __exit ibmvscsi_module_exit(void)
|
|
{
|
|
vio_unregister_driver(&ibmvscsi_driver);
|
|
}
|
|
|
|
module_init(ibmvscsi_module_init);
|
|
module_exit(ibmvscsi_module_exit);
|