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 <suganath-prabu.subramani@xxxxxxxxxxxx>
---
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
