If the posted request has an error of any type, the IOC writes a Reply message into a host-based system reply message frame. This functions clone it in the BAR0 mapped region.
Signed-off-by: Suganath Prabu S <[email protected]> --- drivers/scsi/mpt3sas/mpt3sas_base.c | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index 0248058..fa13916 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -126,6 +126,32 @@ module_param_call(mpt3sas_fwfault_debug, _scsih_set_fwfault_debug, param_get_int, &mpt3sas_fwfault_debug, 0644); /** + * _base_clone_reply_to_sys_mem - copies reply to reply free iomem + * in BAR0 space. + * + * @ioc: per adapter object + * @reply: reply message frame(lower 32bit addr) + * @index: System request message index. + * + * @Returns - Nothing + */ +static void +_base_clone_reply_to_sys_mem(struct MPT3SAS_ADAPTER *ioc, U32 reply, + u32 index) +{ + /* + * 256 is offset within sys register. + * 256 offset MPI frame starts. Max MPI frame supported is 32. + * 32 * 128 = 4K. From here, Clone of reply free for mcpu starts + */ + u16 cmd_credit = ioc->facts.RequestCredit + 1; + void *reply_free_iomem = (void *)ioc->chip + MPI_FRAME_START_OFFSET + + (cmd_credit * ioc->request_sz) + (index * sizeof(u32)); + + writel(cpu_to_le32(reply), reply_free_iomem); +} + +/** * _base_clone_mpi_to_sys_mem - Writes/copies MPI frames * to system/BAR0 region. * @@ -1396,6 +1422,9 @@ _base_interrupt(int irq, void *bus_id) 0 : ioc->reply_free_host_index + 1; ioc->reply_free[ioc->reply_free_host_index] = cpu_to_le32(reply); + if (ioc->is_mcpu_endpoint) + _base_clone_reply_to_sys_mem(ioc, reply, + ioc->reply_free_host_index); writel(ioc->reply_free_host_index, &ioc->chip->ReplyFreeHostIndex); } @@ -6244,8 +6273,11 @@ _base_make_ioc_operational(struct MPT3SAS_ADAPTER *ioc) /* initialize Reply Free Queue */ for (i = 0, reply_address = (u32)ioc->reply_dma ; i < ioc->reply_free_queue_depth ; i++, reply_address += - ioc->reply_sz) + ioc->reply_sz) { ioc->reply_free[i] = cpu_to_le32(reply_address); + if (ioc->is_mcpu_endpoint) + _base_clone_reply_to_sys_mem(ioc, reply_address, i); + } /* initialize reply queues */ if (ioc->is_driver_loading) -- 2.5.5
