Re: [PATCH v3 16/17] arcmsr: support new adapter ARC12x4 series
From: Tomas Henzl
Date: Thu Aug 28 2014 - 08:49:46 EST
On 08/28/2014 05:46 PM, Ching Huang wrote:
> On Wed, 2014-08-27 at 16:00 +0200, Tomas Henzl wrote:
>> On 08/19/2014 09:25 AM, Ching Huang wrote:
>>> From: Ching Huang <ching2048@xxxxxxxxxxxx>
>>>
>>> Add code for supporting Areca new Raid adapter ARC12x4 series.
>>>
>>> Signed-off-by: Ching Huang <ching2048@xxxxxxxxxxxx>
>>> ---
>> Hi Ching,
>> please look at the comments below -
>>
>>> }
>>> @@ -1039,7 +1147,60 @@ static void arcmsr_done4abort_postqueue(
>>> error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE1) ? true : false;
>>> arcmsr_drain_donequeue(acb, pCCB, error);
>>> }
>>> - }
>>> + }
>>> + break;
>>> + case ACB_ADAPTER_TYPE_D: {
>>> + struct MessageUnit_D *pmu = acb->pmuD;
>>> + uint32_t ccb_cdb_phy, outbound_write_pointer;
>>> + uint32_t doneq_index, index_stripped, addressLow, residual;
>>> + bool error;
>>> + struct CommandControlBlock *pCCB;
>> I have noticed this^ in this driver already before. Sometimes it makes sense
>> when a variable is declared in a 'case' block but often it is just
>> a waste of space. In this function this is the third 'bool error' declared.
>> Is there a reason for this style (this function is not the worst case) ?
> Yea, there is many variable are duplicate declaration, I will clean it up.
>>> + outbound_write_pointer = pmu->done_qbuffer[0].addressLow + 1;
>>> + doneq_index = pmu->doneq_index;
>>> + residual = atomic_read(&acb->ccboutstandingcount);
>>> + for (i = 0; i < residual; i++) {
>>> + while ((doneq_index & 0xFFF) !=
>>> + (outbound_write_pointer & 0xFFF)) {
>>> + if (doneq_index & 0x4000) {
>>> + index_stripped = doneq_index & 0xFFF;
>>> + index_stripped += 1;
>>> + index_stripped %=
>>> + ARCMSR_MAX_ARC1214_DONEQUEUE;
>>> + pmu->doneq_index = index_stripped ?
>>> + (index_stripped | 0x4000) :
>>> + (index_stripped + 1);
>>> + } else {
>>> + index_stripped = doneq_index;
>>> + index_stripped += 1;
>>> + index_stripped %=
>>> + ARCMSR_MAX_ARC1214_DONEQUEUE;
>>> + pmu->doneq_index = index_stripped ?
>>> + index_stripped :
>>> + ((index_stripped | 0x4000) + 1);
>>> + }
>>> + doneq_index = pmu->doneq_index;
>>> + addressLow = pmu->done_qbuffer[doneq_index &
>>> + 0xFFF].addressLow;
>>> + ccb_cdb_phy = (addressLow & 0xFFFFFFF0);
>>> + pARCMSR_CDB = (struct ARCMSR_CDB *)
>>> + (acb->vir2phy_offset + ccb_cdb_phy);
>>> + pCCB = container_of(pARCMSR_CDB,
>>> + struct CommandControlBlock, arcmsr_cdb);
>>> + error = (addressLow &
>>> + ARCMSR_CCBREPLY_FLAG_ERROR_MODE1) ?
>>> + true : false;
>>> + arcmsr_drain_donequeue(acb, pCCB, error);
>>> + writel(doneq_index, pmu->outboundlist_read_pointer);
>>> + }
>>> + mdelay(10);
>>> + outbound_write_pointer =
>>> + pmu->done_qbuffer[0].addressLow + 1;
>>> + doneq_index = pmu->doneq_index;
>>> + }
>>> + pmu->postq_index = 0;
>>> + pmu->doneq_index = 0x40FF;
>>> + }
>>> + break;
>>> }
>>> }
>> ...
>>
>>>
>>> @@ -1256,6 +1424,38 @@ static void arcmsr_post_ccb(struct Adapt
>>> writel(ccb_post_stamp, &phbcmu->inbound_queueport_low);
>>> }
>>> }
>>> + break;
>>> + case ACB_ADAPTER_TYPE_D: {
>>> + struct MessageUnit_D *pmu = acb->pmuD;
>>> + u16 index_stripped;
>>> + u16 postq_index;
> u16 postq_index, toggle;
>>> + unsigned long flags;
>>> + struct InBound_SRB *pinbound_srb;
>>> +
>>> + spin_lock_irqsave(&acb->postq_lock, flags);
>>> + postq_index = pmu->postq_index;
>>> + pinbound_srb = (struct InBound_SRB *)&(pmu->post_qbuffer[postq_index & 0xFF]);
>>> + pinbound_srb->addressHigh = dma_addr_hi32(cdb_phyaddr);
>>> + pinbound_srb->addressLow = dma_addr_lo32(cdb_phyaddr);
>>> + pinbound_srb->length = ccb->arc_cdb_size >> 2;
>>> + arcmsr_cdb->msgContext = dma_addr_lo32(cdb_phyaddr);
>>> + if (postq_index & 0x4000) {
>>> + index_stripped = postq_index & 0xFF;
>>> + index_stripped += 1;
>>> + index_stripped %= ARCMSR_MAX_ARC1214_POSTQUEUE;
>>> + pmu->postq_index = index_stripped ?
>>> + (index_stripped | 0x4000) : index_stripped;
>>> + } else {
>>> + index_stripped = postq_index;
>>> + index_stripped += 1;
>>> + index_stripped %= ARCMSR_MAX_ARC1214_POSTQUEUE;
>>> + pmu->postq_index = index_stripped ? index_stripped :
>>> + (index_stripped | 0x4000);
>>> + }
>> The code above could be a bit easier -
> Yea. I simplify it to following.
> toggle = postq_index & 0x4000;
I might be wrong but the following two lines:
> index_stripped = (postq_index & 0xFF) + 1;
the first '&' is not needed, because we use a modulo in a next step
> index_stripped %= ARCMSR_MAX_ARC1214_POSTQUEUE;
and module is for certain binary numbers equivalent to '&', so this
could be changed into
index_stripped = postq_index + 1;
index_stripped &= (ARCMSR_MAX_ARC1214_POSTQUEUE - 1);
( ARCMSR_MAX_ARC1214_POSTQUEUE is equal 0x100)
and this
> pmu->postq_index = index_stripped ? (index_stripped | toggle) :
> (index_stripped | (toggle ^ 0x4000));
into
pmu->postq_index = index_stripped ? (index_stripped | toggle) :
(toggle ^ 0x4000);
Let us stop this discussion, it's not a bug, you may or may not include it in your next series,
we can discuss it there.
For another question, please look below.
>>
>> arcmsr_cdb->msgContext = dma_addr_lo32(cdb_phyaddr);
>> index_stripped = postq_index + 1;
>> index_stripped &= (ARCMSR_MAX_ARC1214_POSTQUEUE - 1);
>>
>> if (postq_index & 0x4000)
>> pmu->postq_index = index_stripped ?
>> (index_stripped | 0x4000) : index_stripped;
>> else
>> pmu->postq_index = index_stripped ?
>> index_stripped : (index_stripped | 0x4000);
>> or am I wrong? This is repeated in the code many times
> Yea. one for postQueue and 3 times for doneQueue. They all can be simplified as above.
>>
>>
>>> + writel(postq_index, pmu->inboundlist_write_pointer);
>>> + spin_unlock_irqrestore(&acb->postq_lock, flags);
>>> + break;
>>> + }
>>> }
>>> }
>>>
>> ...
>>> +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;
>>> + 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) {
>>> + outbound_write_pointer = pmu->done_qbuffer[0].addressLow + 1;
>>> + doneq_index = pmu->doneq_index;
>> You seem to protect the doneq with a spinlock on some other places, arcmsr_hbaD_postqueue_isr
>> and below in this function. Why not here, is it intentional?
> Before came here, the h/w interrupt was disabled. Hence, don't worry about other thread
> to change doneq_index.
I guess you mean the hw interrupts from your card. If so and if you know that no other thread on another
processor can access the doneq_index - why do you use the spinlock just few lines below?
>>> + if ((outbound_write_pointer & 0xFFF) == (doneq_index & 0xFFF)) {
>>> + if (poll_ccb_done) {
>>> + rtn = SUCCESS;
>>> + break;
>>> + } else {
>>> + msleep(25);
>>> + if (poll_count > 40) {
>>> + rtn = FAILED;
>>> + break;
>>> + }
>>> + goto polling_hbaD_ccb_retry;
>>> + }
>>> + }
>>> + spin_lock_irqsave(&acb->doneq_lock, flags);
>>> + if (doneq_index & 0x4000) {
>>> + index_stripped = doneq_index & 0xFFF;
>>> + index_stripped += 1;
>>> + index_stripped %= ARCMSR_MAX_ARC1214_DONEQUEUE;
>>> + pmu->doneq_index = index_stripped ?
>>> + (index_stripped | 0x4000) :
>>> + (index_stripped + 1);
>>> + } else {
>>> + index_stripped = doneq_index;
>>> + index_stripped += 1;
>>> + index_stripped %= ARCMSR_MAX_ARC1214_DONEQUEUE;
>>> + pmu->doneq_index = index_stripped ? index_stripped :
>>> + ((index_stripped | 0x4000) + 1);
>>> + }
>>> + 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;
>>> +}
>>> +
>>> static int arcmsr_polling_ccbdone(struct AdapterControlBlock *acb,
>>> struct CommandControlBlock *poll_ccb)
>>> {
>>> @@ -2711,6 +3280,10 @@ static int arcmsr_polling_ccbdone(struct
>>> case ACB_ADAPTER_TYPE_C: {
>>> rtn = arcmsr_hbaC_polling_ccbdone(acb, poll_ccb);
>>> }
>>> + break;
>>> + case ACB_ADAPTER_TYPE_D:
>>> + rtn = arcmsr_hbaD_polling_ccbdone(acb, poll_ccb);
>>> + break;
>>> }
>>> return rtn;
>>> }
>>> @@ -2728,6 +3301,7 @@ static int arcmsr_iop_confirm(struct Ada
>>> */
>>> switch (acb->adapter_type) {
>>> case ACB_ADAPTER_TYPE_B:
>>> + case ACB_ADAPTER_TYPE_D:
>>> dma_coherent_handle = acb->dma_coherent_handle2;
>>> break;
>>> default:
>>> @@ -2817,6 +3391,27 @@ static int arcmsr_iop_confirm(struct Ada
>>> }
>>> }
>>> }
>>> + break;
>>> + case ACB_ADAPTER_TYPE_D: {
>>> + uint32_t __iomem *rwbuffer;
>>> + struct MessageUnit_D *reg = acb->pmuD;
>>> + reg->postq_index = 0;
>>> + reg->doneq_index = 0;
>>> + rwbuffer = reg->msgcode_rwbuffer;
>>> + writel(ARCMSR_SIGNATURE_SET_CONFIG, rwbuffer++);
>>> + writel(cdb_phyaddr_hi32, rwbuffer++);
>>> + writel(cdb_phyaddr, rwbuffer++);
>>> + writel(cdb_phyaddr + (ARCMSR_MAX_ARC1214_POSTQUEUE *
>>> + sizeof(struct InBound_SRB)), rwbuffer++);
>>> + writel(0x100, rwbuffer);
>>> + writel(ARCMSR_INBOUND_MESG0_SET_CONFIG, reg->inbound_msgaddr0);
>>> + if (!arcmsr_hbaD_wait_msgint_ready(acb)) {
>>> + pr_notice("arcmsr%d: 'set command Q window' timeout\n",
>>> + acb->host->host_no);
>>> + return 1;
>>> + }
>>> + }
>>> + break;
>>> }
>>> return 0;
>>> }
>>> @@ -2848,6 +3443,15 @@ static void arcmsr_wait_firmware_ready(s
>>> firmware_state = readl(®->outbound_msgaddr1);
>>> } while ((firmware_state & ARCMSR_HBCMU_MESSAGE_FIRMWARE_OK) == 0);
>>> }
>>> + break;
>>> + case ACB_ADAPTER_TYPE_D: {
>>> + struct MessageUnit_D *reg = acb->pmuD;
>>> + do {
>>> + firmware_state = readl(reg->outbound_msgaddr1);
>>> + } while ((firmware_state &
>>> + ARCMSR_ARC1214_MESSAGE_FIRMWARE_OK) == 0);
>>> + }
>>> + break;
>>> }
>>> }
>>>
>>> @@ -2918,6 +3522,35 @@ static void arcmsr_hbaC_request_device_m
>>> return;
>>> }
>>>
>>> +static void arcmsr_hbaD_request_device_map(struct AdapterControlBlock *acb)
>>> +{
>>> + struct MessageUnit_D *reg = acb->pmuD;
>>> +
>>> + if (unlikely(atomic_read(&acb->rq_map_token) == 0) ||
>>> + ((acb->acb_flags & ACB_F_BUS_RESET) != 0) ||
>>> + ((acb->acb_flags & ACB_F_ABORT) != 0)) {
>>> + mod_timer(&acb->eternal_timer,
>>> + jiffies + msecs_to_jiffies(6 * HZ));
>>> + } else {
>>> + acb->fw_flag = FW_NORMAL;
>>> + if (atomic_read(&acb->ante_token_value) ==
>>> + atomic_read(&acb->rq_map_token)) {
>>> + atomic_set(&acb->rq_map_token, 16);
>>> + }
>>> + atomic_set(&acb->ante_token_value,
>>> + atomic_read(&acb->rq_map_token));
>>> + if (atomic_dec_and_test(&acb->rq_map_token)) {
>>> + mod_timer(&acb->eternal_timer, jiffies +
>>> + msecs_to_jiffies(6 * HZ));
>>> + return;
>>> + }
>>> + writel(ARCMSR_INBOUND_MESG0_GET_CONFIG,
>>> + reg->inbound_msgaddr0);
>>> + mod_timer(&acb->eternal_timer, jiffies +
>>> + msecs_to_jiffies(6 * HZ));
>>> + }
>>> +}
>>> +
>>> static void arcmsr_request_device_map(unsigned long pacb)
>>> {
>>> struct AdapterControlBlock *acb = (struct AdapterControlBlock *)pacb;
>>> @@ -2933,6 +3566,10 @@ static void arcmsr_request_device_map(un
>>> case ACB_ADAPTER_TYPE_C: {
>>> arcmsr_hbaC_request_device_map(acb);
>>> }
>>> + break;
>>> + case ACB_ADAPTER_TYPE_D:
>>> + arcmsr_hbaD_request_device_map(acb);
>>> + break;
>>> }
>>> }
>>>
>>> @@ -2970,6 +3607,19 @@ static void arcmsr_hbaC_start_bgrb(struc
>>> }
>>> return;
>>> }
>>> +
>>> +static void arcmsr_hbaD_start_bgrb(struct AdapterControlBlock *pACB)
>>> +{
>>> + struct MessageUnit_D *pmu = pACB->pmuD;
>>> +
>>> + pACB->acb_flags |= ACB_F_MSG_START_BGRB;
>>> + writel(ARCMSR_INBOUND_MESG0_START_BGRB, pmu->inbound_msgaddr0);
>>> + if (!arcmsr_hbaD_wait_msgint_ready(pACB)) {
>>> + pr_notice("arcmsr%d: wait 'start adapter "
>>> + "background rebulid' timeout\n", pACB->host->host_no);
>>> + }
>>> +}
>>> +
>>> static void arcmsr_start_adapter_bgrb(struct AdapterControlBlock *acb)
>>> {
>>> switch (acb->adapter_type) {
>>> @@ -2981,6 +3631,10 @@ static void arcmsr_start_adapter_bgrb(st
>>> break;
>>> case ACB_ADAPTER_TYPE_C:
>>> arcmsr_hbaC_start_bgrb(acb);
>>> + break;
>>> + case ACB_ADAPTER_TYPE_D:
>>> + arcmsr_hbaD_start_bgrb(acb);
>>> + break;
>>> }
>>> }
>>>
>>> @@ -3026,6 +3680,29 @@ static void arcmsr_clear_doorbell_queue_
>>> break;
>>> }
>>> }
>>> + break;
>>> + case ACB_ADAPTER_TYPE_D: {
>>> + struct MessageUnit_D *reg = acb->pmuD;
>>> + uint32_t outbound_doorbell, i;
>>> + /* empty doorbell Qbuffer if door bell ringed */
>>> + outbound_doorbell = readl(reg->outbound_doorbell);
>>> + writel(outbound_doorbell, reg->outbound_doorbell);
>>> + writel(ARCMSR_ARC1214_DRV2IOP_DATA_OUT_READ,
>>> + reg->inbound_doorbell);
>>> + for (i = 0; i < 200; i++) {
>>> + msleep(20);
>>> + outbound_doorbell = readl(reg->outbound_doorbell);
>>> + if (outbound_doorbell &
>>> + ARCMSR_ARC1214_IOP2DRV_DATA_WRITE_OK) {
>>> + writel(outbound_doorbell,
>>> + reg->outbound_doorbell);
>>> + writel(ARCMSR_ARC1214_DRV2IOP_DATA_OUT_READ,
>>> + reg->inbound_doorbell);
>>> + } else
>>> + break;
>>> + }
>>> + }
>>> + break;
>>> }
>>> }
>>>
>>> @@ -3056,6 +3733,7 @@ static void arcmsr_hardware_reset(struct
>>> int i, count = 0;
>>> struct MessageUnit_A __iomem *pmuA = acb->pmuA;
>>> struct MessageUnit_C __iomem *pmuC = acb->pmuC;
>>> + struct MessageUnit_D *pmuD = acb->pmuD;
>>>
>>> /* backup pci config data */
>>> printk(KERN_NOTICE "arcmsr%d: executing hw bus reset .....\n", acb->host->host_no);
>>> @@ -3076,6 +3754,8 @@ static void arcmsr_hardware_reset(struct
>>> writel(0xD, &pmuC->write_sequence);
>>> } while (((readl(&pmuC->host_diagnostic) & ARCMSR_ARC1880_DiagWrite_ENABLE) == 0) && (count < 5));
>>> writel(ARCMSR_ARC1880_RESET_ADAPTER, &pmuC->host_diagnostic);
>>> + } else if ((acb->dev_id == 0x1214)) {
>>> + writel(0x20, pmuD->reset_request);
>>> } else {
>>> pci_write_config_byte(acb->pdev, 0x84, 0x20);
>>> }
>>> @@ -3272,6 +3952,66 @@ sleep:
>>> }
>>> break;
>>> }
>>> + case ACB_ADAPTER_TYPE_D: {
>>> + if (acb->acb_flags & ACB_F_BUS_RESET) {
>>> + long timeout;
>>> + pr_notice("arcmsr: there is an bus reset"
>>> + " eh proceeding.......\n");
>>> + timeout = wait_event_timeout(wait_q, (acb->acb_flags
>>> + & ACB_F_BUS_RESET) == 0, 220 * HZ);
>>> + if (timeout)
>>> + return SUCCESS;
>>> + }
>>> + acb->acb_flags |= ACB_F_BUS_RESET;
>>> + if (!arcmsr_iop_reset(acb)) {
>>> + struct MessageUnit_D *reg;
>>> + reg = acb->pmuD;
>>> + arcmsr_hardware_reset(acb);
>>> + acb->acb_flags &= ~ACB_F_IOP_INITED;
>>> + nap:
>>> + ssleep(ARCMSR_SLEEPTIME);
>>> + if ((readl(reg->sample_at_reset) & 0x80) != 0) {
>>> + pr_err("arcmsr%d: waiting for "
>>> + "hw bus reset return, retry=%d\n",
>>> + acb->host->host_no, retry_count);
>>> + if (retry_count > ARCMSR_RETRYCOUNT) {
>>> + acb->fw_flag = FW_DEADLOCK;
>>> + pr_err("arcmsr%d: waiting for hw bus"
>>> + " reset return, "
>>> + "RETRY TERMINATED!!\n",
>>> + acb->host->host_no);
>>> + return FAILED;
>>> + }
>>> + retry_count++;
>>> + goto nap;
>>> + }
>>> + acb->acb_flags |= ACB_F_IOP_INITED;
>>> + /* disable all outbound interrupt */
>>> + intmask_org = arcmsr_disable_outbound_ints(acb);
>>> + arcmsr_get_firmware_spec(acb);
>>> + arcmsr_start_adapter_bgrb(acb);
>>> + arcmsr_clear_doorbell_queue_buffer(acb);
>>> + arcmsr_enable_outbound_ints(acb, intmask_org);
>>> + atomic_set(&acb->rq_map_token, 16);
>>> + atomic_set(&acb->ante_token_value, 16);
>>> + acb->fw_flag = FW_NORMAL;
>>> + mod_timer(&acb->eternal_timer,
>>> + jiffies + msecs_to_jiffies(6 * HZ));
>>> + acb->acb_flags &= ~ACB_F_BUS_RESET;
>>> + rtn = SUCCESS;
>>> + pr_err("arcmsr: scsi bus reset "
>>> + "eh returns with success\n");
>>> + } else {
>>> + acb->acb_flags &= ~ACB_F_BUS_RESET;
>>> + atomic_set(&acb->rq_map_token, 16);
>>> + atomic_set(&acb->ante_token_value, 16);
>>> + acb->fw_flag = FW_NORMAL;
>>> + mod_timer(&acb->eternal_timer,
>>> + jiffies + msecs_to_jiffies(6 * HZ));
>>> + rtn = SUCCESS;
>>> + }
>>> + break;
>>> + }
>>> }
>>> return rtn;
>>> }
>>> @@ -3348,6 +4088,7 @@ static const char *arcmsr_info(struct Sc
>>> case PCI_DEVICE_ID_ARECA_1280:
>>> type = "SATA";
>>> break;
>>> + case PCI_DEVICE_ID_ARECA_1214:
>>> case PCI_DEVICE_ID_ARECA_1380:
>>> case PCI_DEVICE_ID_ARECA_1381:
>>> case PCI_DEVICE_ID_ARECA_1680:
>>>
>>>
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