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

From: Tomas Henzl
Date: Wed Aug 27 2014 - 10:01:32 EST

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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) ?

> + 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;
> + 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 -

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

> + 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?

> + 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(&reg->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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