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Subject[RFC] [PATCH] 5/7 2.5.35 SCSI multi-path
Patches to scsi adapter drivers (scsi low level drivers) to simplify and
enable the addition of scsi multi-path IO support.

This does not add multi-path support, it adds changes that simplify the
addition of the actual scsi multi-path code.

Only the adapters that have been run with the multi-path patch are
included here. Other adpaters will likely fail compilation.

This includes a change to the qlogicfc.c driver to flush all SCSI commands
on a loop down, so that driver is more functional with the multi-path
patch (when patched on top of this patch).

aic7xxx/aic7xxx_linux.c | 28 +++++++++++++++-----------
ips.c | 7 +++++-
qlogicfc.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 73 insertions(+), 13 deletions(-)

diff -Nru a/drivers/scsi/aic7xxx/aic7xxx_linux.c b/drivers/scsi/aic7xxx/aic7xxx_linux.c
--- a/drivers/scsi/aic7xxx/aic7xxx_linux.c Mon Sep 16 15:29:45 2002
+++ b/drivers/scsi/aic7xxx/aic7xxx_linux.c Mon Sep 16 15:29:45 2002
@@ -1457,15 +1457,14 @@
struct ahc_softc *ahc;
u_long flags;
int scbnum;
+ scsi_traverse_hndl_t strav_hndl;

ahc = *((struct ahc_softc **)host->hostdata);
ahc_lock(ahc, &flags);
scbnum = 0;
- for (device = scsi_devs; device != NULL; device = device->next) {
- if (device->host == host) {
- ahc_linux_device_queue_depth(ahc, device);
- scbnum += device->queue_depth;
- }
+ scsi_for_each_host_sdev(&strav_hndl, device, host->host_no) {
+ ahc_linux_device_queue_depth(ahc, device);
+ scbnum += device->queue_depth;
}
ahc_unlock(ahc, &flags);
}
@@ -1480,11 +1479,14 @@
struct ahc_initiator_tinfo *targ_info;
struct ahc_tmode_tstate *tstate;
uint8_t tags;
+ struct scsi_path_id scsi_path;
+
+ scsi_get_path(device, &scsi_path);

ahc_compile_devinfo(&devinfo,
- device->channel == 0 ? ahc->our_id : ahc->our_id_b,
- device->id, device->lun,
- device->channel == 0 ? 'A' : 'B',
+ scsi_path.spi_channel == 0 ? ahc->our_id : ahc->our_id_b,
+ scsi_path.spi_id, scsi_path.spi_lun,
+ scsi_path.spi_channel == 0 ? 'A' : 'B',
ROLE_INITIATOR);
targ_info = ahc_fetch_transinfo(ahc, devinfo.channel,
devinfo.our_scsiid,
@@ -1515,8 +1517,8 @@
device->queue_depth = tags;
ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
printf("scsi%d:%c:%d:%d: Tagged Queuing enabled. Depth %d\n",
- ahc->platform_data->host->host_no, device->channel + 'A',
- device->id, device->lun, tags);
+ ahc->platform_data->host->host_no, scsi_path.spi_channel + 'A',
+ scsi_path.spi_id, scsi_path.spi_lun, tags);
} else {
/*
* We allow the OS to queue 2 untagged transactions to
@@ -2735,8 +2737,10 @@
int extended;
struct ahc_softc *ahc;
unsigned char *buf;
+ struct scsi_path_id scsi_path;

- ahc = *((struct ahc_softc **)disk->device->host->hostdata);
+ scsi_get_path(disk->device, &scsi_path);
+ ahc = *((struct ahc_softc **)scsi_path.spi_shpnt->hostdata);
buf = scsi_bios_ptable(bdev);

if (buf) {
@@ -2752,7 +2756,7 @@

if (aic7xxx_extended != 0)
extended = 1;
- else if (disk->device->channel == 0)
+ else if (scsi_path.spi_channel == 0)
extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
else
extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
diff -Nru a/drivers/scsi/ips.c b/drivers/scsi/ips.c
--- a/drivers/scsi/ips.c Mon Sep 16 15:29:45 2002
+++ b/drivers/scsi/ips.c Mon Sep 16 15:29:45 2002
@@ -1858,10 +1858,15 @@
int heads;
int sectors;
int cylinders;
+ struct Scsi_Host *host;

METHOD_TRACE("ips_biosparam", 1);

- ha = (ips_ha_t *) disk->device->host->hostdata;
+ host = scsi_get_host(disk->device);
+ if (host == NULL)
+ return (0);
+
+ ha = (ips_ha_t *) host->hostdata;

if (!ha)
/* ?!?! host adater info invalid */
diff -Nru a/drivers/scsi/qlogicfc.c b/drivers/scsi/qlogicfc.c
--- a/drivers/scsi/qlogicfc.c Mon Sep 16 15:29:45 2002
+++ b/drivers/scsi/qlogicfc.c Mon Sep 16 15:29:45 2002
@@ -679,6 +679,8 @@
static void isp2x00_print_status_entry(struct Status_Entry *);
#endif

+static void do_isp2x00_flush_all_SCSI_cmds(unsigned long arg);
+
static inline void isp2x00_enable_irqs(struct Scsi_Host *host)
{
outw(ISP_EN_INT | ISP_EN_RISC, host->io_port + PCI_INTER_CTL);
@@ -1154,6 +1156,13 @@

DEBUG(isp2x00_print_scsi_cmd(Cmnd));

+ if (hostdata->adapter_state == AS_LOOP_DOWN) {
+ Cmnd->result = DID_NO_CONNECT << 16;
+ if (Cmnd->scsi_done)
+ (*Cmnd->scsi_done) (Cmnd);
+ return 0;
+ }
+
if (hostdata->adapter_state & AS_REDO_FABRIC_PORTDB || hostdata->adapter_state & AS_REDO_LOOP_PORTDB) {
isp2x00_make_portdb(host);
hostdata->adapter_state = AS_LOOP_GOOD;
@@ -1469,6 +1478,7 @@
case LOOP_DOWN:
printk("qlogicfc%d : Link is Down\n", hostdata->host_id);
hostdata->adapter_state = AS_LOOP_DOWN;
+ do_isp2x00_flush_all_SCSI_cmds((unsigned long) host);
break;
case CONNECTION_MODE:
printk("received CONNECTION_MODE irq %x\n", inw(host->io_port + MBOX1));
@@ -2222,6 +2232,47 @@
}

#endif /* DEBUG_ISP2x00 */
+
+/*
+ * Flush all SCSI commands we have.
+ */
+void do_isp2x00_flush_all_SCSI_cmds(unsigned long arg)
+{
+ struct Scsi_Host * host = (struct Scsi_Host *) arg;
+ struct isp2x00_hostdata * hostdata;
+ int i;
+
+ hostdata = (struct isp2x00_hostdata *) host->hostdata;
+
+ printk("qlogicfc%d : Flushing all SCSI commands?\n", hostdata->host_id);
+ for (i = 0; i < QLOGICFC_REQ_QUEUE_LEN; i++){
+ if (hostdata->handle_ptrs[i] ){
+ Scsi_Cmnd *Cmnd = hostdata->handle_ptrs[i];
+
+ if (Cmnd->use_sg)
+ pci_unmap_sg(hostdata->pci_dev,
+ (struct scatterlist *)Cmnd->buffer,
+ Cmnd->use_sg,
+ scsi_to_pci_dma_dir(Cmnd->sc_data_direction));
+ else if (Cmnd->request_bufflen &&
+ Cmnd->sc_data_direction != PCI_DMA_NONE) {
+ pci_unmap_page(hostdata->pci_dev,
+ Cmnd->SCp.dma_handle,
+ Cmnd->request_bufflen,
+ scsi_to_pci_dma_dir(Cmnd->sc_data_direction));
+ }
+
+ Cmnd->result = DID_NO_CONNECT << 16;
+
+ if (Cmnd->scsi_done){
+ (*Cmnd->scsi_done) (Cmnd);
+ }
+ else printk("qlogicfc%d : done is null?\n", hostdata->host_id);
+ hostdata->handle_ptrs[i] = NULL;
+ hostdata->handle_serials[i] = 0;
+ }
+ }
+}

MODULE_LICENSE("GPL");

-
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