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Commit b4472d71 authored by Suganath Prabu Subramani's avatar Suganath Prabu Subramani Committed by Martin K. Petersen
Browse files

scsi: mpt3sas: Introduce function to clone mpi reply. 



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: default avatarSuganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent e5747439

drivers/scsi/mpt3sas/mpt3sas_base.c

+36 −1
Original line number Diff line number Diff line
@@ -125,6 +125,33 @@ _scsih_set_fwfault_debug(const char *val, const struct kernel_param *kp) 
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 __iomem *reply_free_iomem = (void __iomem *)ioc->chip +

			MPI_FRAME_START_OFFSET +

			(cmd_credit * ioc->request_sz) + (index * sizeof(u32));



	writel(reply, reply_free_iomem);

}



/**

 * _base_clone_mpi_to_sys_mem - Writes/copies MPI frames

 *				to system/BAR0 region.
@@ -1400,6 +1427,10 @@ _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,

						cpu_to_le32(reply),

						ioc->reply_free_host_index);

				writel(ioc->reply_free_host_index,

				    &ioc->chip->ReplyFreeHostIndex);

			}
@@ -6242,8 +6273,12 @@ _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,

					(__le32)reply_address, i);

	}



	/* initialize reply queues */

	if (ioc->is_driver_loading)