linux-kernel - Re: [PATCH v3 16/17] arcmsr: support new adapter ARC12x4 series

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Date:	Thu, 11 Sep 2014 16:21:39 +0200
From:	Tomas Henzl <thenzl@...hat.com>
To:	Ching Huang <ching2048@...ca.com.tw>,
	Christoph Hellwig <hch@...radead.org>
CC:	jbottomley@...allels.com, dan.carpenter@...cle.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 16/17] arcmsr: support new adapter ARC12x4 series

On 09/11/2014 05:59 AM, Ching Huang wrote:
> On Wed, 2014-09-10 at 11:58 +0200, Tomas Henzl wrote:
>> On 09/09/2014 06:30 PM, Christoph Hellwig wrote:
>>> Ching,
>>>
>>> do you have a chance to address Thomas second concern below?  As
>>> far as I can tell (Thomas, please correct me) that's the last
>>> outstanding concern, and I'd really like to merge the arcmsr updates
>>> for the Linux 3.18 merge window.
>> Correct, still awaiting a response.
> Christoph, Tomas,
>
> Sorry for the late reply.
>
> I think I misunderstand Tomas' meaning.
> The spin lock in arcmsr_hbaD_polling_ccbdone() is necessary to protect doneq_index and have to be modified as following.

OK, so you are going to repost 16/17 ? If so, please describe all changes you'll do, in that new post.

>
> static int arcmsr_hbaD_polling_ccbdone(struct AdapterControlBlock *acb,
> 				struct CommandControlBlock *poll_ccb)
> {
> 	bool error;
> 	uint32_t poll_ccb_done = 0, poll_count = 0, flag_ccb, ccb_cdb_phy;
> 	int rtn, doneq_index, index_stripped, outbound_write_pointer, toggle;
> 	unsigned long flags;
> 	struct ARCMSR_CDB *arcmsr_cdb;
> 	struct CommandControlBlock *pCCB;
> 	struct MessageUnit_D *pmu = acb->pmuD;
>
> polling_hbaD_ccb_retry:
> 	poll_count++;
> 	while (1) {
> 		spin_lock_irqsave(&acb->doneq_lock, flags);
> 		outbound_write_pointer = pmu->done_qbuffer[0].addressLow + 1;
> 		doneq_index = pmu->doneq_index;
> 		if ((outbound_write_pointer & 0xFFF) == (doneq_index & 0xFFF)) {
> 			spin_unlock_irqrestore(&acb->doneq_lock, flags);
> 			if (poll_ccb_done) {
> 				rtn = SUCCESS;
> 				break;
> 			} else {
> 				msleep(25);
> 				if (poll_count > 40) {
> 					rtn = FAILED;
> 					break;
> 				}
> 				goto polling_hbaD_ccb_retry;
> 			}
> 		}
> 		toggle = doneq_index & 0x4000;
> 		index_stripped = (doneq_index & 0xFFF) + 1;
> 		index_stripped %= ARCMSR_MAX_ARC1214_DONEQUEUE;
> 		pmu->doneq_index = index_stripped ? (index_stripped | toggle) :
> 			((index_stripped + 1) | (toggle ^ 0x4000));
> 		spin_unlock_irqrestore(&acb->doneq_lock, flags);
> 		doneq_index = pmu->doneq_index;
> 		flag_ccb = pmu->done_qbuffer[doneq_index & 0xFFF].addressLow;
> 		ccb_cdb_phy = (flag_ccb & 0xFFFFFFF0);
> 		arcmsr_cdb = (struct ARCMSR_CDB *)(acb->vir2phy_offset +
> 			ccb_cdb_phy);
> 		pCCB = container_of(arcmsr_cdb, struct CommandControlBlock,
> 			arcmsr_cdb);
> 		poll_ccb_done |= (pCCB == poll_ccb) ? 1 : 0;
> 		if ((pCCB->acb != acb) ||
> 			(pCCB->startdone != ARCMSR_CCB_START)) {
> 			if (pCCB->startdone == ARCMSR_CCB_ABORTED) {
> 				pr_notice("arcmsr%d: scsi id = %d "
> 					"lun = %d ccb = '0x%p' poll command "
> 					"abort successfully\n"
> 					, acb->host->host_no
> 					, pCCB->pcmd->device->id
> 					, (u32)pCCB->pcmd->device->lun
> 					, pCCB);
> 				pCCB->pcmd->result = DID_ABORT << 16;
> 				arcmsr_ccb_complete(pCCB);
> 				continue;
> 			}
> 			pr_notice("arcmsr%d: polling an illegal "
> 				"ccb command done ccb = '0x%p' "
> 				"ccboutstandingcount = %d\n"
> 				, acb->host->host_no
> 				, pCCB
> 				, atomic_read(&acb->ccboutstandingcount));
> 			continue;
> 		}
> 		error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE1)
> 			? true : false;
> 		arcmsr_report_ccb_state(acb, pCCB, error);
> 	}
> 	return rtn;
> }
>
>
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>
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