#include <linux/dma-mapping.h>
#include <linux/completion.h>
#include <linux/device.h>
+#include <linux/scatterlist.h>
#include <asm/uaccess.h>
#include <asm/vio.h>
static DEFINE_SPINLOCK(viodasd_spinlock);
#define VIOMAXREQ 16
-#define VIOMAXBLOCKDMA 12
#define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0])
-struct open_data {
- u64 disk_size;
- u16 max_disk;
- u16 cylinders;
- u16 tracks;
- u16 sectors;
- u16 bytes_per_sector;
-};
-
-struct rw_data {
- u64 offset;
- struct {
- u32 token;
- u32 reserved;
- u64 len;
- } dma_info[VIOMAXBLOCKDMA];
-};
-
-struct vioblocklpevent {
- struct HvLpEvent event;
- u32 reserved;
- u16 version;
- u16 sub_result;
- u16 disk;
- u16 flags;
- union {
- struct open_data open_data;
- struct rw_data rw_data;
- u64 changed;
- } u;
-};
-
-#define vioblockflags_ro 0x0001
-
-enum vioblocksubtype {
- vioblockopen = 0x0001,
- vioblockclose = 0x0002,
- vioblockread = 0x0003,
- vioblockwrite = 0x0004,
- vioblockflush = 0x0005,
- vioblockcheck = 0x0007
-};
-
struct viodasd_waitevent {
struct completion com;
int rc;
d = req->rq_disk->private_data;
/* Now build the scatter-gather list */
+ sg_init_table(sg, VIOMAXBLOCKDMA);
nsg = blk_rq_map_sg(req->q, req, sg);
nsg = dma_map_sg(d->dev, sg, nsg, direction);
* Probe a single disk and fill in the viodasd_device structure
* for it.
*/
-static void probe_disk(struct viodasd_device *d)
+static int probe_disk(struct viodasd_device *d)
{
HvLpEvent_Rc hvrc;
struct viodasd_waitevent we;
0, 0, 0);
if (hvrc != 0) {
printk(VIOD_KERN_WARNING "bad rc on HV open %d\n", (int)hvrc);
- return;
+ return 0;
}
wait_for_completion(&we.com);
if (we.rc != 0) {
if (flags != 0)
- return;
+ return 0;
/* try again with read only flag set */
flags = vioblockflags_ro;
goto retry;
if (hvrc != 0) {
printk(VIOD_KERN_WARNING
"bad rc sending event to OS/400 %d\n", (int)hvrc);
- return;
+ return 0;
}
+
+ if (d->dev == NULL) {
+ /* this is when we reprobe for new disks */
+ if (vio_create_viodasd(dev_no) == NULL) {
+ printk(VIOD_KERN_WARNING
+ "cannot allocate virtual device for disk %d\n",
+ dev_no);
+ return 0;
+ }
+ /*
+ * The vio_create_viodasd will have recursed into this
+ * routine with d->dev set to the new vio device and
+ * will finish the setup of the disk below.
+ */
+ return 1;
+ }
+
/* create the request queue for the disk */
spin_lock_init(&d->q_lock);
q = blk_init_queue(do_viodasd_request, &d->q_lock);
if (q == NULL) {
printk(VIOD_KERN_WARNING "cannot allocate queue for disk %d\n",
dev_no);
- return;
+ return 0;
}
g = alloc_disk(1 << PARTITION_SHIFT);
if (g == NULL) {
"cannot allocate disk structure for disk %d\n",
dev_no);
blk_cleanup_queue(q);
- return;
+ return 0;
}
d->disk = g;
/* register us in the global list */
add_disk(g);
+ return 1;
}
/* returns the total number of scatterlist elements converted */
struct viodasd_device *d = &viodasd_devices[vdev->unit_address];
d->dev = &vdev->dev;
- probe_disk(d);
- if (d->disk == NULL)
+ if (!probe_disk(d))
return -ENODEV;
return 0;
}