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Date: Thu, 28 Aug 2014 23:46:49 +0800
From: Ching Huang <ching2048@...ca.com.tw>
To: Tomas Henzl <thenzl@...hat.com>
Cc: hch@...radead.org, 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 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@...ca.com.tw>
> >
> > Add code for supporting Areca new Raid adapter ARC12x4 series.
> >
> > Signed-off-by: Ching Huang <ching2048@...ca.com.tw>
> > ---
>
> 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;
index_stripped = (postq_index & 0xFF) + 1;
index_stripped %= ARCMSR_MAX_ARC1214_POSTQUEUE;
pmu->postq_index = index_stripped ? (index_stripped | toggle) :
(index_stripped | (toggle ^ 0x4000));
>
> 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.
>
> > + 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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>
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