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@vger.kernel.org Signed-off-by: Kashyap Desai kashyap.desai@broadcom.com Signed-off-by: Shivasharan S shivasharan.srikanteshwara@broadcom.com
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@redhat.com
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