Allocate separate DMA area for synchronous IOCB execution.

Usually IOCBs should be put on queue for asynchronous processing and should
not require additional DMA memory.  But there are some cases like aborts and
resets that for external reasons has to be synchronous.  Give those cases
separate 2*64 byte DMA area to decouple them from other DMA scratch area
users, using it for asynchronous requests.

1 files changed, 8 insertions, 0 deletions

diff --git a/sys/dev/isp/ispvar.h b/sys/dev/isp/ispvar.h
index a7184e24e9d4..f0f8cf82cce7 100644
--- a/sys/dev/isp/ispvar.h
+++ b/sys/dev/isp/ispvar.h
@@ -130,6 +130,8 @@ struct ispmdvec {
 #define	SYNC_SFORCPU	3	/* scratch, sync for CPU */
 #define	SYNC_REG	4	/* for registers */
 #define	SYNC_ATIOQ	5	/* atio result queue (24xx) */
+#define	SYNC_IFORDEV	6	/* synchrounous IOCB, sync for ISP */
+#define	SYNC_IFORCPU	7	/* synchrounous IOCB, sync for CPU */
 
 /*
  * Request/Response Queue defines and macros.
@@ -596,6 +598,12 @@ struct ispsoftc {
 	isp_hdl_t		*isp_xffree;
 
 	/*
+	 * DMA mapped in area for synchronous IOCB requests.
+	 */
+	void *			isp_iocb;
+	XS_DMA_ADDR_T		isp_iocb_dma;
+
+	/*
 	 * request/result queue pointers and DMA handles for them.
 	 */
 	void *			isp_rquest;