[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 000000000000..57ff525bdd3b
--- /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;