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Date: Fri, 10 Jun 2016 10:10:26 +1000
From: Julian Calaby <julian.calaby@...il.com>
To: Charles Chiou <ch1102chiou@...il.com>
Cc: jejb@...ux.vnet.ibm.com,
"Martin K. Petersen" <martin.petersen@...cle.com>,
linux-scsi <linux-scsi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linus.chen@...promise.com, grace.chang@...promise.com,
victor.p@...mise.com, eva.cheng@...promise.com,
charles.chiou@...promise.com, paul.lyu@...promise.com
Subject: Re: [PATCH] scsi:stex.c Support Pegasus 3 product
Hi Charles,
On Mon, Jun 6, 2016 at 5:53 PM, Charles Chiou <ch1102chiou@...il.com> wrote:
> From: Charles <charles.chiou@...promise.com>
>
> Pegasus series is a RAID support product by using Thunderbolt technology.
>
> The newest product, Pegasus 3 is support Thunderbolt 3 technology with another chip.
>
> 1.Change driver version.
>
> 2.Add Pegasus 3 VID, DID and define it's device address.
>
> 3.Pegasus 3 use msi interrupt, so stex_request_irq P3 type enable msi.
>
> 4.For hibernation, use msi_lock in stex_ss_handshake to prevent msi register write again when handshaking.
>
> 5.Pegasus 3 don't need read() as flush.
>
> 6.In stex_ss_intr & stex_abort, P3 only clear interrupt register when getting vendor defined interrupt.
>
> 7.Add reboot notifier and register it in stex_probe for all supported device.
>
> 8.For all supported device in restart flow, we get a callback from notifier and set S6flag for stex_shutdown & stex_hba_stop to send restart command to FW.
>
> Signed-off-by: Charles <charles.chiou@...promise.com>
> Signed-off-by: Paul <paul.lyu@...promise.com>
> ---
> drivers/scsi/stex.c | 282 +++++++++++++++++++++++++++++++++++++++-------------
> 1 file changed, 214 insertions(+), 68 deletions(-)
>
> diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
> index 5b23175..9de2de2 100644
> --- a/drivers/scsi/stex.c
> +++ b/drivers/scsi/stex.c
> @@ -87,7 +95,7 @@ enum {
> MU_STATE_STOP = 5,
> MU_STATE_NOCONNECT = 6,
>
> - MU_MAX_DELAY = 120,
> + MU_MAX_DELAY = 50,
This won't cause problems for older adapters, right?
> MU_HANDSHAKE_SIGNATURE = 0x55aaaa55,
> MU_HANDSHAKE_SIGNATURE_HALF = 0x5a5a0000,
> MU_HARD_RESET_WAIT = 30000,
> @@ -540,11 +556,15 @@ stex_ss_send_cmd(struct st_hba *hba, struct req_msg *req, u16 tag)
>
> ++hba->req_head;
> hba->req_head %= hba->rq_count+1;
> -
> - writel((addr >> 16) >> 16, hba->mmio_base + YH2I_REQ_HI);
> - readl(hba->mmio_base + YH2I_REQ_HI); /* flush */
> - writel(addr, hba->mmio_base + YH2I_REQ);
> - readl(hba->mmio_base + YH2I_REQ); /* flush */
> + if (hba->cardtype == st_P3) {
> + writel((addr >> 16) >> 16, hba->mmio_base + YH2I_REQ_HI);
> + writel(addr, hba->mmio_base + YH2I_REQ);
> + } else {
> + writel((addr >> 16) >> 16, hba->mmio_base + YH2I_REQ_HI);
> + readl(hba->mmio_base + YH2I_REQ_HI); /* flush */
> + writel(addr, hba->mmio_base + YH2I_REQ);
> + readl(hba->mmio_base + YH2I_REQ); /* flush */
> + }
The first writel() lines in each branch of the if statement are
identical, so they could be outside of it.
Would it make sense to add a helper that does the readl() flush only
for non-st_P3? This could be a function pointer in the hba structure
which shouldn't slow stuff down.
> }
>
> static void return_abnormal_state(struct st_hba *hba, int status)
> @@ -974,15 +994,31 @@ static irqreturn_t stex_ss_intr(int irq, void *__hba)
>
> spin_lock_irqsave(hba->host->host_lock, flags);
>
> - data = readl(base + YI2H_INT);
> - if (data && data != 0xffffffff) {
> - /* clear the interrupt */
> - writel(data, base + YI2H_INT_C);
> - stex_ss_mu_intr(hba);
> - spin_unlock_irqrestore(hba->host->host_lock, flags);
> - if (unlikely(data & SS_I2H_REQUEST_RESET))
> - queue_work(hba->work_q, &hba->reset_work);
> - return IRQ_HANDLED;
> + if (hba->cardtype == st_yel) {
I note that there's a few different card types beyond sd_yel and
st_P3. Does this function only get called for st_yel and st_P3?
> + data = readl(base + YI2H_INT);
> + if (data && data != 0xffffffff) {
> + /* clear the interrupt */
> + writel(data, base + YI2H_INT_C);
> + stex_ss_mu_intr(hba);
> + spin_unlock_irqrestore(hba->host->host_lock, flags);
> + if (unlikely(data & SS_I2H_REQUEST_RESET))
> + queue_work(hba->work_q, &hba->reset_work);
> + return IRQ_HANDLED;
> + }
> + } else {
> + data = readl(base + PSCRATCH4);
> + if (data != 0xffffffff) {
> + if (data != 0) {
> + /* clear the interrupt */
> + writel(data, base + PSCRATCH1);
> + writel((1 << 22), base + YH2I_INT);
> + }
> + stex_ss_mu_intr(hba);
> + spin_unlock_irqrestore(hba->host->host_lock, flags);
> + if (unlikely(data & SS_I2H_REQUEST_RESET))
> + queue_work(hba->work_q, &hba->reset_work);
> + return IRQ_HANDLED;
> + }
> }
>
> spin_unlock_irqrestore(hba->host->host_lock, flags);
> @@ -1085,14 +1121,27 @@ static int stex_ss_handshake(struct st_hba *hba)
> int ret = 0;
>
> before = jiffies;
> - while ((readl(base + YIOA_STATUS) & SS_MU_OPERATIONAL) == 0) {
> - if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
> - printk(KERN_ERR DRV_NAME
> - "(%s): firmware not operational\n",
> - pci_name(hba->pdev));
> - return -1;
> +
> + if (hba->cardtype == st_yel) {
Same question as above. Does this only get called for st_yel and st_P3?
> + while ((readl(base + YIOA_STATUS) & SS_MU_OPERATIONAL) == 0) {
> + if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
> + printk(KERN_ERR DRV_NAME
> + "(%s): firmware not operational\n",
> + pci_name(hba->pdev));
> + return -1;
> + }
> + msleep(1);
> + }
> + } else if (hba->cardtype == st_P3) {
If it does only get called for st_yel and st_P3, then the if part of
this else-if is redundant.
> + while ((readl(base + PSCRATCH3) & SS_MU_OPERATIONAL) == 0) {
> + if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
> + printk(KERN_ERR DRV_NAME
> + "(%s): firmware not operational\n",
> + pci_name(hba->pdev));
> + return -1;
> + }
> + msleep(1);
> }
> - msleep(1);
> }
>
> msg_h = (struct st_msg_header *)hba->dma_mem;
> @@ -1111,30 +1160,63 @@ static int stex_ss_handshake(struct st_hba *hba)
> scratch_size = (hba->sts_count+1)*sizeof(u32);
> h->scratch_size = cpu_to_le32(scratch_size);
>
> - data = readl(base + YINT_EN);
> - data &= ~4;
> - writel(data, base + YINT_EN);
> - writel((hba->dma_handle >> 16) >> 16, base + YH2I_REQ_HI);
> - readl(base + YH2I_REQ_HI);
> - writel(hba->dma_handle, base + YH2I_REQ);
> - readl(base + YH2I_REQ); /* flush */
> + if (hba->cardtype == st_yel) {
Same question again.
> + data = readl(base + YINT_EN);
> + data &= ~4;
> + writel(data, base + YINT_EN);
> + writel((hba->dma_handle >> 16) >> 16, base + YH2I_REQ_HI);
> + readl(base + YH2I_REQ_HI);
> + writel(hba->dma_handle, base + YH2I_REQ);
> + readl(base + YH2I_REQ); /* flush */
> + } else if (hba->cardtype == st_P3) {
> + data = readl(base + YINT_EN);
> + data &= ~(1 << 0);
> + data &= ~(1 << 2);
> + writel(data, base + YINT_EN);
> + if (hba->msi_lock == 0) {
> + /* P3 MSI Register cannot access twice */
> + writel((1 << 6), base + YH2I_INT);
> + hba->msi_lock = 1;
> + }
> + writel((hba->dma_handle >> 16) >> 16, base + YH2I_REQ_HI);
> + writel(hba->dma_handle, base + YH2I_REQ);
> + }
The two writel()s at the end of each branch of the if statement are
identical except for the readl() calls to flush the data in the non-P3
case. This would be simplified by adding a helper as discussed above.
> - scratch = hba->scratch;
> before = jiffies;
> - while (!(le32_to_cpu(*scratch) & SS_STS_HANDSHAKE)) {
> - if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
> - printk(KERN_ERR DRV_NAME
> - "(%s): no signature after handshake frame\n",
> - pci_name(hba->pdev));
> - ret = -1;
> - break;
> +
> + if (hba->cardtype == st_yel) {
Again, is this only called for st_yel and st_P3?
> + scratch = hba->scratch;
> +
> + while (!(le32_to_cpu(*scratch) & SS_STS_HANDSHAKE)) {
> + if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
> + printk(KERN_ERR DRV_NAME
> + "(%s): no signature after handshake frame\n",
> + pci_name(hba->pdev));
> + ret = -1;
> + break;
> + }
> + rmb();
> + msleep(1);
> }
> - rmb();
> - msleep(1);
> + memset(scratch, 0, scratch_size);
> + } else if (hba->cardtype == st_P3) {
> + while ((readl(base + MAILBOX_BASE + MAILBOX_HNDSHK_STS)
> + & SS_STS_HANDSHAKE) == 0) {
> + if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
> + printk(KERN_ERR DRV_NAME
> + "(%s): no signature after handshake frame\n",
> + pci_name(hba->pdev));
> + ret = -1;
> + break;
> + }
> + rmb();
> + msleep(1);
> + }
> + memset(hba->scratch, 0, scratch_size);
The memsets at the end of each branch of the if statement are identical.
> }
>
> - memset(scratch, 0, scratch_size);
> msg_h->flag = 0;
> +
> return ret;
> }
>
> @@ -1144,7 +1226,7 @@ static int stex_handshake(struct st_hba *hba)
> unsigned long flags;
> unsigned int mu_status;
>
> - err = (hba->cardtype == st_yel) ?
> + err = (hba->cardtype == st_yel || hba->cardtype == st_P3) ?
> stex_ss_handshake(hba) : stex_common_handshake(hba);
This might be cleaner as an if statement.
> spin_lock_irqsave(hba->host->host_lock, flags);
> mu_status = hba->mu_status;
> @@ -1197,9 +1288,9 @@ static int stex_abort(struct scsi_cmnd *cmd)
>
> writel(data, base + ODBL);
> readl(base + ODBL); /* flush */
> -
> stex_mu_intr(hba, data);
> }
> +
Unrelated whitespace change.
> if (hba->wait_ccb == NULL) {
> printk(KERN_WARNING DRV_NAME
> "(%s): lost interrupt\n", pci_name(hba->pdev));
> @@ -1502,18 +1620,30 @@ static int stex_request_irq(struct st_hba *hba)
> struct pci_dev *pdev = hba->pdev;
> int status;
>
> - if (msi) {
> + if (hba->cardtype == st_yel) {
Again, is this only run for st_yel or st_P3?
Why not simplify this to:
- if (msi) {
+ if (msi || hba->cardtype == st_P3) {
> + if (msi) {
> + status = pci_enable_msi(pdev);
> + if (status != 0)
> + printk(KERN_ERR DRV_NAME
> + "(%s): error %d setting up MSI\n",
> + pci_name(pdev), status);
> + else
> + hba->msi_enabled = 1;
> + } else
> + hba->msi_enabled = 0;
> + } else if (hba->cardtype == st_P3) {
> status = pci_enable_msi(pdev);
> if (status != 0)
> printk(KERN_ERR DRV_NAME
> "(%s): error %d setting up MSI\n",
> - pci_name(pdev), status);
> + pci_name(pdev), status);
> else
> hba->msi_enabled = 1;
> } else
> hba->msi_enabled = 0;
>
> - status = request_irq(pdev->irq, hba->cardtype == st_yel ?
> + status = request_irq(pdev->irq,
> + (hba->cardtype == st_yel || hba->cardtype == st_P3) ?
> stex_ss_intr : stex_intr, IRQF_SHARED, DRV_NAME, hba);
>
> if (status != 0) {
> @@ -1546,6 +1676,9 @@ static int stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>
> pci_set_master(pdev);
>
> + S6flag = 0;
> + register_reboot_notifier(&stex_notifier);
> +
Adding the reboot notifier applies to all cards, so it should probably
be a separate patch.
> host = scsi_host_alloc(&driver_template, sizeof(struct st_hba));
>
> if (!host) {
> @@ -1736,28 +1870,29 @@ static void stex_hba_stop(struct st_hba *hba, int st_sleep_mic)
>
> spin_lock_irqsave(hba->host->host_lock, flags);
>
> - if (hba->cardtype == st_yel && hba->supports_pm == 1)
> - {
> - if(st_sleep_mic == ST_NOTHANDLED)
> - {
> + if ((hba->cardtype == st_yel && hba->supports_pm == 1)
> + || (hba->cardtype == st_P3 && hba->supports_pm == 1)) {
if ((hba->cardtype == st_yel || hba->cardtype == st_P3) &&
hba->supports_pm == 1) {
is simpler.
> + if (st_sleep_mic == ST_NOTHANDLED) {
> spin_unlock_irqrestore(hba->host->host_lock, flags);
> return;
> }
> }
> req = hba->alloc_rq(hba);
> - if (hba->cardtype == st_yel) {
> + if (hba->cardtype == st_yel || hba->cardtype == st_P3) {
> msg_h = (struct st_msg_header *)req - 1;
> memset(msg_h, 0, hba->rq_size);
> } else
> memset(req, 0, hba->rq_size);
>
> - if ((hba->cardtype == st_yosemite || hba->cardtype == st_yel)
> + if ((hba->cardtype == st_yosemite || hba->cardtype == st_yel
> + || hba->cardtype == st_P3)
> && st_sleep_mic == ST_IGNORED) {
> req->cdb[0] = MGT_CMD;
> req->cdb[1] = MGT_CMD_SIGNATURE;
> req->cdb[2] = CTLR_CONFIG_CMD;
> req->cdb[3] = CTLR_SHUTDOWN;
> - } else if (hba->cardtype == st_yel && st_sleep_mic != ST_IGNORED) {
> + } else if ((hba->cardtype == st_yel || hba->cardtype == st_P3)
> + && st_sleep_mic != ST_IGNORED) {
Er, this will never get run.
We have:
if (hba->cardtype == st_yosemite || hba->cardtype == st_yel ||
hba->cardtype == st_P3) {
// stuff
} else if ((hba->cardtype == st_yel || hba->cardtype == st_P3) &&
st_sleep_mic != ST_IGNORED) {
// stuff
}
Should the two branches of the if statement be reversed or should the
first one be written like:
if (hba->cardtype == st_yosemite || ((hba->cardtype == st_yel ||
hba->cardtype == st_P3) && st_sleep_mic == ST_IGNORED)) {
> req->cdb[0] = MGT_CMD;
> req->cdb[1] = MGT_CMD_SIGNATURE;
> req->cdb[2] = CTLR_CONFIG_CMD;
> @@ -1768,16 +1903,14 @@ static void stex_hba_stop(struct st_hba *hba, int st_sleep_mic)
> req->cdb[1] = CTLR_POWER_STATE_CHANGE;
> req->cdb[2] = CTLR_POWER_SAVING;
> }
> -
> hba->ccb[tag].cmd = NULL;
> hba->ccb[tag].sg_count = 0;
> hba->ccb[tag].sense_bufflen = 0;
> hba->ccb[tag].sense_buffer = NULL;
> hba->ccb[tag].req_type = PASSTHRU_REQ_TYPE;
> -
> hba->send(hba, req, tag);
> - spin_unlock_irqrestore(hba->host->host_lock, flags);
>
> + spin_unlock_irqrestore(hba->host->host_lock, flags);
More unrelated whitespace changes.
> before = jiffies;
> while (hba->ccb[tag].req_type & PASSTHRU_REQ_TYPE) {
> if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
> @@ -1821,24 +1954,29 @@ static void stex_remove(struct pci_dev *pdev)
> scsi_host_put(hba->host);
>
> pci_disable_device(pdev);
> +
> + unregister_reboot_notifier(&stex_notifier);
Again, not P3 specific.
> }
>
> static void stex_shutdown(struct pci_dev *pdev)
> {
> struct st_hba *hba = pci_get_drvdata(pdev);
> -
> - if (hba->supports_pm == 0)
> + if (hba->supports_pm == 0) {
> stex_hba_stop(hba, ST_IGNORED);
> - else
> + } else if (hba->supports_pm == 1 && S6flag) {
> + unregister_reboot_notifier(&stex_notifier);
> + stex_hba_stop(hba, ST_S6);
> + } else
Also not P3 specific.
> stex_hba_stop(hba, ST_S5);
> }
>
> -static int stex_choice_sleep_mic(pm_message_t state)
> +static int stex_choice_sleep_mic(struct st_hba *hba, pm_message_t state)
> {
> switch (state.event) {
> case PM_EVENT_SUSPEND:
> return ST_S3;
> case PM_EVENT_HIBERNATE:
> + hba->msi_lock = 0;
> return ST_S4;
> default:
> return ST_NOTHANDLED;
> @@ -1864,6 +2003,13 @@ static int stex_resume(struct pci_dev *pdev)
> stex_handshake(hba);
> return 0;
> }
> +
> +static int stex_halt(struct notifier_block *nb, unsigned long event, void *buf)
> +{
> + S6flag = 1;
> + return NOTIFY_OK;
> +}
> +
And again.
Why is this needed?
> MODULE_DEVICE_TABLE(pci, stex_pci_tbl);
>
> static struct pci_driver stex_pci_driver = {
> --
> 1.9.1
>
> --
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Thanks,
--
Julian Calaby
Email: julian.calaby@...il.com
Profile: http://www.google.com/profiles/julian.calaby/
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