On Fri, Jan 27, 2017 at 11:28:39AM -0800, Raghava Aditya Renukunta wrote:
> Reworked aac_command_thread into aac_process_events
>
> Signed-off-by: Raghava Aditya Renukunta
> <[email protected]>
> Signed-off-by: Dave Carroll <[email protected]>
>
> ---
Wow, thanks for factoring this out.
> +static void aac_process_events(struct aac_dev *dev)
> +{
> + struct hw_fib *hw_fib, *hw_newfib;
> + struct fib *fib, *newfib;
> + struct aac_fib_context *fibctx;
> + unsigned long flags;
> + spinlock_t *t_lock;
> +
t_lock = dev->queues->queue[HostNormCmdQueue].lock;
spin_lock_irqsave(t_lock, flags);
> + spin_lock_irqsave(dev->queues->queue[HostNormCmdQueue].lock, flags);
> + while (!list_empty(&(dev->queues->queue[HostNormCmdQueue].cmdq))) {
> + struct list_head *entry;
> + struct aac_aifcmd *aifcmd;
> + u32 time_now, time_last;
> + unsigned long flagv;
> + unsigned int num;
> + struct hw_fib **hw_fib_pool, **hw_fib_p;
> + struct fib **fib_pool, **fib_p;
> +
> + set_current_state(TASK_RUNNING);
> +
> + entry = dev->queues->queue[HostNormCmdQueue].cmdq.next;
> + list_del(entry);
> +
> +
> + t_lock = dev->queues->queue[HostNormCmdQueue].lock;
> + spin_unlock_irqrestore(t_lock, flags);
> +
> + fib = list_entry(entry, struct fib, fiblink);
> + hw_fib = fib->hw_fib_va;
> + /*
> + * We will process the FIB here or pass it to a
> + * worker thread that is TBD. We Really can't
> + * do anything at this point since we don't have
> + * anything defined for this thread to do.
> + */
> + memset(fib, 0, sizeof(struct fib));
> + fib->type = FSAFS_NTC_FIB_CONTEXT;
> + fib->size = sizeof(struct fib);
> + fib->hw_fib_va = hw_fib;
> + fib->data = hw_fib->data;
> + fib->dev = dev;
> + /*
> + * We only handle AifRequest fibs from the adapter.
> + */
> +
> + aifcmd = (struct aac_aifcmd *) hw_fib->data;
> + if (aifcmd->command == cpu_to_le32(AifCmdDriverNotify)) {
> + /* Handle Driver Notify Events */
> + aac_handle_aif(dev, fib);
> + *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
> + aac_fib_adapter_complete(fib, (u16)sizeof(u32));
> + continue;
> + }
> + /*
> + * The u32 here is important and intended. We are using
> + * 32bit wrapping time to fit the adapter field
> + */
> +
> +
> + /* Sniff events */
> + if ((aifcmd->command == cpu_to_le32(AifCmdEventNotify)) ||
> + (aifcmd->command ==
> + cpu_to_le32(AifCmdJobProgress))) {
Parenthesis and indentation.
> + aac_handle_aif(dev, fib);
> + }
> +
> + time_now = jiffies/HZ;
> +
> + /*
> + * Warning: no sleep allowed while
> + * holding spinlock. We take the estimate
> + * and pre-allocate a set of fibs outside the
> + * lock.
> + */
> + num = le32_to_cpu(dev->init->r7.adapter_fibs_size)
> + / sizeof(struct hw_fib); /* some extra */
> + spin_lock_irqsave(&dev->fib_lock, flagv);
> + entry = dev->fib_list.next;
> + while (entry != &dev->fib_list) {
> + entry = entry->next;
> + ++num;
> + }
> + spin_unlock_irqrestore(&dev->fib_lock, flagv);
Bonus points for getting the estimation of the fibs into an own function. From
the start of the comment till the spin_unlock().
> + hw_fib_pool = kmalloc_array(num, sizeof(struct hw_fib *),
> + GFP_KERNEL);
> + fib_pool = kmalloc_array(num, sizeof(struct fib *),
> + GFP_KERNEL);
> + if (num && fib_pool && hw_fib_pool) {
Ditto for the following block (this would have the benefit of describing what
the block does).
> + hw_fib_p = hw_fib_pool;
> + fib_p = fib_pool;
> + while (hw_fib_p < &hw_fib_pool[num]) {
> + *(hw_fib_p) = kmalloc(sizeof(struct hw_fib),
> + GFP_KERNEL);
> + if (!(*(hw_fib_p++))) {
> + --hw_fib_p;
> + break;
> + }
> + *(fib_p) = kmalloc(sizeof(struct fib),
> + GFP_KERNEL);
> + if (!(*(fib_p++))) {
> + kfree(*(--hw_fib_p));
> + break;
> + }
> + }
> + num = hw_fib_p - hw_fib_pool;
> + if (!num) {
> + kfree(fib_pool);
> + fib_pool = NULL;
> + kfree(hw_fib_pool);
> + hw_fib_pool = NULL;
> + continue;
> + }
> + } else {
> + kfree(hw_fib_pool);
> + hw_fib_pool = NULL;
> + kfree(fib_pool);
> + fib_pool = NULL;
> + }
And for either everything under the fib_lock or the while loop.
> + spin_lock_irqsave(&dev->fib_lock, flagv);
> + entry = dev->fib_list.next;
> + /*
> + * For each Context that is on the
> + * fibctxList, make a copy of the
> + * fib, and then set the event to wake up the
> + * thread that is waiting for it.
> + */
> + hw_fib_p = hw_fib_pool;
> + fib_p = fib_pool;
> + while (entry != &dev->fib_list) {
> + /*
> + * Extract the fibctx
> + */
> + fibctx = list_entry(entry, struct aac_fib_context,
> + next);
> + /*
> + * Check if the queue is getting
> + * backlogged
> + */
> + if (fibctx->count > 20) {
> + /*
> + * It's *not* jiffies folks,
> + * but jiffies / HZ so do not
> + * panic ...
> + */
> + time_last = fibctx->jiffies;
> + /*
> + * Has it been > 2 minutes
> + * since the last read off
> + * the queue?
> + */
> + if ((time_now - time_last) > aif_timeout) {
> + entry = entry->next;
> + aac_close_fib_context(dev, fibctx);
> + continue;
> + }
> + }
> + /*
> + * Warning: no sleep allowed while
> + * holding spinlock
> + */
> + if (hw_fib_p < &hw_fib_pool[num]) {
> + hw_newfib = *hw_fib_p;
> + *(hw_fib_p++) = NULL;
> + newfib = *fib_p;
> + *(fib_p++) = NULL;
> + /*
> + * Make the copy of the FIB
> + */
> + memcpy(hw_newfib, hw_fib,
> + sizeof(struct hw_fib));
> + memcpy(newfib, fib, sizeof(struct fib));
> + newfib->hw_fib_va = hw_newfib;
> + /*
> + * Put the FIB onto the
> + * fibctx's fibs
> + */
> + list_add_tail(&newfib->fiblink,
> + &fibctx->fib_list);
> + fibctx->count++;
> + /*
> + * Set the event to wake up the
> + * thread that is waiting.
> + */
> + up(&fibctx->wait_sem);
> + } else {
> + pr_warn("aifd: didn't allocate NewFib.\n");
> + }
> + entry = entry->next;
> + }
> + /*
> + * Set the status of this FIB
> + */
> + *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
> + aac_fib_adapter_complete(fib, sizeof(u32));
> + spin_unlock_irqrestore(&dev->fib_lock, flagv);
> + /* Free up the remaining resources */
> + hw_fib_p = hw_fib_pool;
> + fib_p = fib_pool;
> + while (hw_fib_p < &hw_fib_pool[num]) {
> + kfree(*hw_fib_p);
> + kfree(*fib_p);
> + ++fib_p;
> + ++hw_fib_p;
> + }
> + kfree(hw_fib_pool);
> + kfree(fib_pool);
> + kfree(fib);
> + spin_lock_irqsave(dev->queues->queue[HostNormCmdQueue].lock,
> + flags);
> + }
> + /*
> + * There are no more AIF's
> + */
> + spin_unlock_irqrestore(dev->queues->queue[HostNormCmdQueue].lock,
> + flags);
> +}
[...]
Thanks,
this change is highly appreciated by me
Johannes
--
Johannes Thumshirn Storage
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