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[SCSI] libsas: Add SATA support to STP piece for SATA on SAS expanders

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This patch adds support for SATA over SAS expanders to the previous two
SATA support in libsas patches.

There were a couple of nasty non trivial things to sort out before this
one could be made to work.

Firstly, I'd like to thank Doug Gilbert for diagnosing a problem with
the LSI expanders where the REPORT_SATA_PHY command was returning the
D2H FIS in the wrong order (Although, here, I think I have to blame the
SAS standards which specifies the FIS "shall be returned in little
endian format" and later on "which means resp[24] shall be FIS type"
The latter, of course, implying big endian format).  Just to make sure,
I put a check for the D2H FIS type being in the wrong position and
reverse the FIS data if it is.

The second is a problem outlined in Annex G of the SAS standard (again,
a technical point with D2H FIS ... necessitating a phy reset on certain
conditions).

With the patch, I can now see my SATA-1 disk in a cascaded expander
configuration.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley 2006-08-22 12:39:19 -05:00 committed by James Bottomley
parent fa1c1e8f1e
commit 1acce1942a
1 changed files with 68 additions and 13 deletions
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81
drivers/scsi/libsas/sas_expander.c
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@ -220,6 +220,36 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
#define DISCOVER_REQ_SIZE 16
#define DISCOVER_RESP_SIZE 56
static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
u8 *disc_resp, int single)
{
int i, res;
disc_req[9] = single;
for (i = 1 ; i < 3; i++) {
struct discover_resp *dr;
res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
disc_resp, DISCOVER_RESP_SIZE);
if (res)
return res;
/* This is detecting a failure to transmit inital
* dev to host FIS as described in section G.5 of
* sas-2 r 04b */
dr = &((struct smp_resp *)disc_resp)->disc;
if (!(dr->attached_dev_type == 0 &&
dr->attached_sata_dev))
break;
/* In order to generate the dev to host FIS, we
* send a link reset to the expander port */
sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET);
/* Wait for the reset to trigger the negotiation */
msleep(500);
}
sas_set_ex_phy(dev, single, disc_resp);
return 0;
}
static int sas_ex_phy_discover(struct domain_device *dev, int single)
{
struct expander_device *ex = &dev->ex_dev;
@ -240,23 +270,15 @@ static int sas_ex_phy_discover(struct domain_device *dev, int single)
disc_req[1] = SMP_DISCOVER;
if (0 <= single && single < ex->num_phys) {
disc_req[9] = single;
res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
disc_resp, DISCOVER_RESP_SIZE);
if (res)
goto out_err;
sas_set_ex_phy(dev, single, disc_resp);
res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
} else {
int i;
for (i = 0; i < ex->num_phys; i++) {
disc_req[9] = i;
res = smp_execute_task(dev, disc_req,
DISCOVER_REQ_SIZE, disc_resp,
DISCOVER_RESP_SIZE);
res = sas_ex_phy_discover_helper(dev, disc_req,
disc_resp, i);
if (res)
goto out_err;
sas_set_ex_phy(dev, i, disc_resp);
}
}
out_err:
@ -529,6 +551,7 @@ static int sas_get_report_phy_sata(struct domain_device *dev,
{
int res;
u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
u8 *resp = (u8 *)rps_resp;
if (!rps_req)
return -ENOMEM;
@ -539,8 +562,28 @@ static int sas_get_report_phy_sata(struct domain_device *dev,
res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
rps_resp, RPS_RESP_SIZE);
/* 0x34 is the FIS type for the D2H fis. There's a potential
* standards cockup here. sas-2 explicitly specifies the FIS
* should be encoded so that FIS type is in resp[24].
* However, some expanders endian reverse this. Undo the
* reversal here */
if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
int i;
for (i = 0; i < 5; i++) {
int j = 24 + (i*4);
u8 a, b;
a = resp[j + 0];
b = resp[j + 1];
resp[j + 0] = resp[j + 3];
resp[j + 1] = resp[j + 2];
resp[j + 2] = b;
resp[j + 3] = a;
}
}
kfree(rps_req);
return 0;
return res;
}
static void sas_ex_get_linkrate(struct domain_device *parent,
@ -625,14 +668,26 @@ static struct domain_device *sas_ex_discover_end_dev(
}
memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
sizeof(struct dev_to_host_fis));
rphy = sas_end_device_alloc(phy->port);
/* FIXME: error handling */
BUG_ON(!rphy);
sas_init_dev(child);
child->rphy = rphy;
spin_lock(&parent->port->dev_list_lock);
list_add_tail(&child->dev_list_node, &parent->port->dev_list);
spin_unlock(&parent->port->dev_list_lock);
res = sas_discover_sata(child);
if (res) {
SAS_DPRINTK("sas_discover_sata() for device %16llx at "
"%016llx:0x%x returned 0x%x\n",
SAS_ADDR(child->sas_addr),
SAS_ADDR(parent->sas_addr), phy_id, res);
goto out_free;
goto out_list_del;
}
} else if (phy->attached_tproto & SAS_PROTO_SSP) {
child->dev_type = SAS_END_DEV;