static int pvscsi_abort(struct scsi_cmnd *cmd)
{
struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
struct pvscsi_ctx *ctx;
unsigned long flags;
scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
adapter->host->host_no, cmd);
spin_lock_irqsave(&adapter->hw_lock, flags);
/*
* Poll the completion ring first - we might be trying to abort
* a command that is waiting to be dispatched in the completion ring.
*/
pvscsi_process_completion_ring(adapter);
/*
* If there is no context for the command, it either already succeeded
* or else was never properly issued. Not our problem.
*/
ctx = pvscsi_find_context(adapter, cmd);
if (!ctx) {
scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
goto out;
}
pvscsi_abort_cmd(adapter, ctx);
pvscsi_process_completion_ring(adapter);
out:
spin_unlock_irqrestore(&adapter->hw_lock, flags);
return SUCCESS;
}
static irqreturn_t pvscsi_isr(int irq, void *devp)
{
struct pvscsi_adapter *adapter = devp;
int handled;
if (adapter->use_msi || adapter->use_msix)
handled = true;
else {
u32 val = pvscsi_read_intr_status(adapter);
handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0;
if (handled)
pvscsi_write_intr_status(devp, val);
}
if (handled) {
unsigned long flags;
spin_lock_irqsave(&adapter->hw_lock, flags);
pvscsi_process_completion_ring(adapter);
if (adapter->use_msg && pvscsi_msg_pending(adapter))
queue_work(adapter->workqueue, &adapter->work);
spin_unlock_irqrestore(&adapter->hw_lock, flags);
}
return IRQ_RETVAL(handled);
}
static int pvscsi_host_reset(struct scsi_cmnd *cmd)
{
struct Scsi_Host *host = cmd->device->host;
struct pvscsi_adapter *adapter = shost_priv(host);
unsigned long flags;
bool use_msg;
scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n");
spin_lock_irqsave(&adapter->hw_lock, flags);
use_msg = adapter->use_msg;
if (use_msg) {
adapter->use_msg = 0;
spin_unlock_irqrestore(&adapter->hw_lock, flags);
/*
* Now that we know that the ISR won't add more work on the
* workqueue we can safely flush any outstanding work.
*/
flush_workqueue(adapter->workqueue);
spin_lock_irqsave(&adapter->hw_lock, flags);
}
/*
* We're going to tear down the entire ring structure and set it back
* up, so stalling new requests until all completions are flushed and
* the rings are back in place.
*/
pvscsi_process_request_ring(adapter);
ll_adapter_reset(adapter);
/*
* Now process any completions. Note we do this AFTER adapter reset,
* which is strange, but stops races where completions get posted
* between processing the ring and issuing the reset. The backend will
* not touch the ring memory after reset, so the immediately pre-reset
* completion ring state is still valid.
*/
pvscsi_process_completion_ring(adapter);
pvscsi_reset_all(adapter);
adapter->use_msg = use_msg;
pvscsi_setup_all_rings(adapter);
pvscsi_unmask_intr(adapter);
spin_unlock_irqrestore(&adapter->hw_lock, flags);
return SUCCESS;
}
static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)
{
pvscsi_mask_intr(adapter);
if (adapter->workqueue)
flush_workqueue(adapter->workqueue);
pvscsi_shutdown_intr(adapter);
pvscsi_process_request_ring(adapter);
pvscsi_process_completion_ring(adapter);
ll_adapter_reset(adapter);
}
static int pvscsi_device_reset(struct scsi_cmnd *cmd)
{
struct Scsi_Host *host = cmd->device->host;
struct pvscsi_adapter *adapter = shost_priv(host);
unsigned long flags;
scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n",
host->host_no, cmd->device->id);
/*
* We don't want to queue new requests for this device after flushing
* all pending requests to emulation, since new requests could then
* sneak in during this device reset phase, so take the lock now.
*/
spin_lock_irqsave(&adapter->hw_lock, flags);
pvscsi_process_request_ring(adapter);
ll_device_reset(adapter, cmd->device->id);
pvscsi_process_completion_ring(adapter);
spin_unlock_irqrestore(&adapter->hw_lock, flags);
return SUCCESS;
}
static int pvscsi_abort(struct scsi_cmnd *cmd)
{
struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
struct pvscsi_ctx *ctx;
unsigned long flags;
int result = SUCCESS;
DECLARE_COMPLETION_ONSTACK(abort_cmp);
scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
adapter->host->host_no, cmd);
spin_lock_irqsave(&adapter->hw_lock, flags);
/*
* Poll the completion ring first - we might be trying to abort
* a command that is waiting to be dispatched in the completion ring.
*/
pvscsi_process_completion_ring(adapter);
/*
* If there is no context for the command, it either already succeeded
* or else was never properly issued. Not our problem.
*/
ctx = pvscsi_find_context(adapter, cmd);
if (!ctx) {
scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
goto out;
}
/*
* Mark that the command has been requested to be aborted and issue
* the abort.
*/
ctx->abort_cmp = &abort_cmp;
pvscsi_abort_cmd(adapter, ctx);
spin_unlock_irqrestore(&adapter->hw_lock, flags);
/* Wait for 2 secs for the completion. */
wait_for_completion_timeout(&abort_cmp, msecs_to_jiffies(2000));
spin_lock_irqsave(&adapter->hw_lock, flags);
if (!completion_done(&abort_cmp)) {
/*
* Failed to abort the command, unmark the fact that it
* was requested to be aborted.
*/
ctx->abort_cmp = NULL;
result = FAILED;
scmd_printk(KERN_DEBUG, cmd,
"Failed to get completion for aborted cmd %p\n",
cmd);
goto out;
}
/*
* Successfully aborted the command.
*/
cmd->result = (DID_ABORT << 16);
cmd->scsi_done(cmd);
out:
spin_unlock_irqrestore(&adapter->hw_lock, flags);
return result;
}