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megaraid_sas: IO throttling support
This patch will add capability in driver to tell firmware that it can throttle IOs in case controller's queue depth is downgraded post OFU (online firmware upgrade). This feature will ensure firmware can be downgraded from higher queue depth to lower queue depth without needing system reboot. Added throttling code in IO path of driver, in case OS tries to send more IOs than post OFU firmware's queue depth. Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com> Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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parent
308ec459bc
commit
52b62ac7c6
2 changed files with 5 additions and 2 deletions
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@ -1537,7 +1537,8 @@ union megasas_sgl_frame {
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typedef union _MFI_CAPABILITIES {
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struct {
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#if defined(__BIG_ENDIAN_BITFIELD)
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u32 reserved:21;
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u32 reserved:20;
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u32 support_qd_throttling:1;
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u32 support_fp_rlbypass:1;
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u32 support_vfid_in_ioframe:1;
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u32 support_ext_io_size:1;
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@ -1561,7 +1562,8 @@ typedef union _MFI_CAPABILITIES {
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u32 support_ext_io_size:1;
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u32 support_vfid_in_ioframe:1;
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u32 support_fp_rlbypass:1;
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u32 reserved:21;
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u32 support_qd_throttling:1;
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u32 reserved:20;
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#endif
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} mfi_capabilities;
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__le32 reg;
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@ -803,6 +803,7 @@ megasas_ioc_init_fusion(struct megasas_instance *instance)
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if (!dual_qdepth_disable)
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drv_ops->mfi_capabilities.support_ext_queue_depth = 1;
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drv_ops->mfi_capabilities.support_qd_throttling = 1;
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/* Convert capability to LE32 */
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cpu_to_le32s((u32 *)&init_frame->driver_operations.mfi_capabilities);
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