Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / scsi / arm / scsi.h

diff --git a/kernel/drivers/scsi/arm/scsi.h b/kernel/drivers/scsi/arm/scsi.h
new file mode 100644 (file)
index 0000000..138a521
--- /dev/null
+++ b/kernel/drivers/scsi/arm/scsi.h
@@ -0,0 +1,128 @@
+/*
+ *  linux/drivers/acorn/scsi/scsi.h
+ *
+ *  Copyright (C) 2002 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Commonly used scsi driver functions.
+ */
+
+#include <linux/scatterlist.h>
+
+#define BELT_AND_BRACES
+
+/*
+ * The scatter-gather list handling.  This contains all
+ * the yucky stuff that needs to be fixed properly.
+ */
+
+/*
+ * copy_SCp_to_sg() Assumes contiguous allocation at @sg of at-most @max
+ * entries of uninitialized memory. SCp is from scsi-ml and has a valid
+ * (possibly chained) sg-list
+ */
+static inline int copy_SCp_to_sg(struct scatterlist *sg, struct scsi_pointer *SCp, int max)
+{
+       int bufs = SCp->buffers_residual;
+
+       /* FIXME: It should be easy for drivers to loop on copy_SCp_to_sg().
+        * and to remove this BUG_ON. Use min() in-its-place
+        */
+       BUG_ON(bufs + 1 > max);
+
+       sg_set_buf(sg, SCp->ptr, SCp->this_residual);
+
+       if (bufs) {
+               struct scatterlist *src_sg;
+               unsigned i;
+
+               for_each_sg(sg_next(SCp->buffer), src_sg, bufs, i)
+                       *(++sg) = *src_sg;
+               sg_mark_end(sg);
+       }
+
+       return bufs + 1;
+}
+
+static inline int next_SCp(struct scsi_pointer *SCp)
+{
+       int ret = SCp->buffers_residual;
+       if (ret) {
+               SCp->buffer = sg_next(SCp->buffer);
+               SCp->buffers_residual--;
+               SCp->ptr = sg_virt(SCp->buffer);
+               SCp->this_residual = SCp->buffer->length;
+       } else {
+               SCp->ptr = NULL;
+               SCp->this_residual = 0;
+       }
+       return ret;
+}
+
+static inline unsigned char get_next_SCp_byte(struct scsi_pointer *SCp)
+{
+       char c = *SCp->ptr;
+
+       SCp->ptr += 1;
+       SCp->this_residual -= 1;
+
+       return c;
+}
+
+static inline void put_next_SCp_byte(struct scsi_pointer *SCp, unsigned char c)
+{
+       *SCp->ptr = c;
+       SCp->ptr += 1;
+       SCp->this_residual -= 1;
+}
+
+static inline void init_SCp(struct scsi_cmnd *SCpnt)
+{
+       memset(&SCpnt->SCp, 0, sizeof(struct scsi_pointer));
+
+       if (scsi_bufflen(SCpnt)) {
+               unsigned long len = 0;
+
+               SCpnt->SCp.buffer = scsi_sglist(SCpnt);
+               SCpnt->SCp.buffers_residual = scsi_sg_count(SCpnt) - 1;
+               SCpnt->SCp.ptr = sg_virt(SCpnt->SCp.buffer);
+               SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
+               SCpnt->SCp.phase = scsi_bufflen(SCpnt);
+
+#ifdef BELT_AND_BRACES
+               {       /*
+                        * Calculate correct buffer length.  Some commands
+                        * come in with the wrong scsi_bufflen.
+                        */
+                       struct scatterlist *sg;
+                       unsigned i, sg_count = scsi_sg_count(SCpnt);
+
+                       scsi_for_each_sg(SCpnt, sg, sg_count, i)
+                               len += sg->length;
+
+                       if (scsi_bufflen(SCpnt) != len) {
+                               printk(KERN_WARNING
+                                      "scsi%d.%c: bad request buffer "
+                                      "length %d, should be %ld\n",
+                                       SCpnt->device->host->host_no,
+                                       '0' + SCpnt->device->id,
+                                       scsi_bufflen(SCpnt), len);
+                               /*
+                                * FIXME: Totaly naive fixup. We should abort
+                                * with error
+                                */
+                               SCpnt->SCp.phase =
+                                       min_t(unsigned long, len,
+                                             scsi_bufflen(SCpnt));
+                       }
+               }
+#endif
+       } else {
+               SCpnt->SCp.ptr = NULL;
+               SCpnt->SCp.this_residual = 0;
+               SCpnt->SCp.phase = 0;
+       }
+}