On 02/12/2018 06:39 AM, Shivasharan S wrote:
> Problem Statement:
> Sending I/O through 32 bit descriptors to Ventura series of controller
> results in IO timeout on certain conditions.
>
> This error only occurs on systems with high I/O activity on
> Ventura series controllers.
>
> Changes in this patch will prevent driver from using 32 bit descriptor
> and use 64 bit Descriptors.
>
> Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>
> Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@xxxxxxxxxxxx>
> ---
> drivers/scsi/megaraid/megaraid_sas_fusion.c | 37 ++++++++++-------------------
> 1 file changed, 12 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
> index 073ced07e662..09f2bdb14b0a 100644
> --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
> +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
> @@ -226,26 +226,21 @@ static void
> megasas_fire_cmd_fusion(struct megasas_instance *instance,
> union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc)
> {
> - if (instance->adapter_type == VENTURA_SERIES)
> - writel(le32_to_cpu(req_desc->u.low),
> - &instance->reg_set->inbound_single_queue_port);
> - else {
> #if defined(writeq) && defined(CONFIG_64BIT)
> - u64 req_data = (((u64)le32_to_cpu(req_desc->u.high) << 32) |
> - le32_to_cpu(req_desc->u.low));
> + u64 req_data = (((u64)le32_to_cpu(req_desc->u.high) << 32) |
> + le32_to_cpu(req_desc->u.low));
>
> - writeq(req_data, &instance->reg_set->inbound_low_queue_port);
> + writeq(req_data, &instance->reg_set->inbound_low_queue_port);
> #else
> - unsigned long flags;
> - spin_lock_irqsave(&instance->hba_lock, flags);
> - writel(le32_to_cpu(req_desc->u.low),
> - &instance->reg_set->inbound_low_queue_port);
> - writel(le32_to_cpu(req_desc->u.high),
> - &instance->reg_set->inbound_high_queue_port);
> - mmiowb();
> - spin_unlock_irqrestore(&instance->hba_lock, flags);
> + unsigned long flags;
> + spin_lock_irqsave(&instance->hba_lock, flags);
> + writel(le32_to_cpu(req_desc->u.low),
> + &instance->reg_set->inbound_low_queue_port);
> + writel(le32_to_cpu(req_desc->u.high),
> + &instance->reg_set->inbound_high_queue_port);
> + mmiowb();
> + spin_unlock_irqrestore(&instance->hba_lock, flags);
> #endif
> - }
> }
>
> /**
> @@ -982,7 +977,6 @@ megasas_ioc_init_fusion(struct megasas_instance *instance)
> const char *sys_info;
> MFI_CAPABILITIES *drv_ops;
> u32 scratch_pad_2;
> - unsigned long flags;
> ktime_t time;
> bool cur_fw_64bit_dma_capable;
>
> @@ -1121,14 +1115,7 @@ megasas_ioc_init_fusion(struct megasas_instance *instance)
> break;
> }
>
> - /* For Ventura also IOC INIT required 64 bit Descriptor write. */
> - spin_lock_irqsave(&instance->hba_lock, flags);
> - writel(le32_to_cpu(req_desc.u.low),
> - &instance->reg_set->inbound_low_queue_port);
> - writel(le32_to_cpu(req_desc.u.high),
> - &instance->reg_set->inbound_high_queue_port);
> - mmiowb();
> - spin_unlock_irqrestore(&instance->hba_lock, flags);
> + megasas_fire_cmd_fusion(instance, &req_desc);
>
> wait_and_poll(instance, cmd, MFI_POLL_TIMEOUT_SECS);
>
Reviewed-by: Tomas Henzl <thenzl@xxxxxxxxxx>
Please also remove the text
* Ventura supports 32 bit Descriptor.
* Prior to Ventura (12G) MR controller supports 64 bit Descriptor.
from the function description (not urgent may happen later)
Thanks,
Tomas