[PATCH] I2O: Adaptec specific SG_IO access, firmware access through sysfs and 2400A workaround

Changes:
 - Provide SG_IO access to BLOCK and EXECUTIVE class on Adaptec
   controllers
 - Use PRIVATE messages in SCSI-OSM because on some controllers normal
   SCSI class commands like READ or READ CAPACITY cause errors
 - Use new DMA and SG list creation function
 - Added workaround to limit sectors per request for Adaptec 2400A
   controllers

Signed-off-by: Markus Lidel <Markus.Lidel@shadowconnect.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/include/scsi/sg_request.h b/include/scsi/sg_request.h
new file mode 100644
index 00000000000..57ff525bdd3
--- /dev/null
+++ b/include/scsi/sg_request.h
@@ -0,0 +1,26 @@
+typedef struct scsi_request Scsi_Request;
+
+static Scsi_Request *dummy_cmdp;	/* only used for sizeof */
+
+typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
+	unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
+	unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
+	unsigned bufflen;	/* Size of (aggregate) data buffer */
+	unsigned b_malloc_len;	/* actual len malloc'ed in buffer */
+	void *buffer;		/* Data buffer or scatter list (k_use_sg>0) */
+	char dio_in_use;	/* 0->indirect IO (or mmap), 1->dio */
+	unsigned char cmd_opcode; /* first byte of command */
+} Sg_scatter_hold;
+
+typedef struct sg_request {	/* SG_MAX_QUEUE requests outstanding per file */
+	Scsi_Request *my_cmdp;	/* != 0  when request with lower levels */
+	struct sg_request *nextrp;	/* NULL -> tail request (slist) */
+	struct sg_fd *parentfp;	/* NULL -> not in use */
+	Sg_scatter_hold data;	/* hold buffer, perhaps scatter list */
+	sg_io_hdr_t header;	/* scsi command+info, see <scsi/sg.h> */
+	unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
+	char res_used;		/* 1 -> using reserve buffer, 0 -> not ... */
+	char orphan;		/* 1 -> drop on sight, 0 -> normal */
+	char sg_io_owned;	/* 1 -> packet belongs to SG_IO */
+	volatile char done;	/* 0->before bh, 1->before read, 2->read */
+} Sg_request;