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scsi: cxlflash: Remove port configuration assumptions

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At present, the cxlflash driver only supports hardware with two FC ports. The
code was initially designed with this assumption and is dependent on having
two FC ports - adding more ports will break logic within the driver.

To mitigate this issue, remove the existing port assumptions and transition
the code to support more than two ports. As a side effect, clarify the
interpretation of the DK_CXLFLASH_ALL_PORTS_ACTIVE flag.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Matthew R. Ochs 2017-04-12 14:14:05 -05:00 committed by Martin K. Petersen
parent 78ae028e82
commit 8fa4f1770d
8 changed files with 77 additions and 45 deletions
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5
Documentation/powerpc/cxlflash.txt
View File

@ -239,6 +239,11 @@ DK_CXLFLASH_USER_VIRTUAL
resource handle that is provided is already referencing provisioned
storage. This is reflected by the last LBA being a non-zero value.
When a LUN is accessible from more than one port, this ioctl will
return with the DK_CXLFLASH_ALL_PORTS_ACTIVE return flag set. This
provides the user with a hint that I/O can be retried in the event
of an I/O error as the LUN can be reached over multiple paths.
DK_CXLFLASH_VLUN_RESIZE
-----------------------
This ioctl is responsible for resizing a previously created virtual

4
drivers/scsi/cxlflash/common.h
View File

@ -29,6 +29,10 @@ extern const struct file_operations cxlflash_cxl_fops;
#define NUM_FC_PORTS CXLFLASH_NUM_FC_PORTS /* ports per AFU */
#define MAX_FC_PORTS CXLFLASH_MAX_FC_PORTS /* ports per AFU */
#define CHAN2PORTMASK(_x) (1 << (_x)) /* channel to port mask */
#define PORTMASK2CHAN(_x) (ilog2((_x))) /* port mask to channel */
#define PORTNUM2CHAN(_x) ((_x) - 1) /* port number to channel */
#define CXLFLASH_BLOCK_SIZE 4096 /* 4K blocks */
#define CXLFLASH_MAX_XFER_SIZE 16777216 /* 16MB transfer */
#define CXLFLASH_MAX_SECTORS (CXLFLASH_MAX_XFER_SIZE/512) /* SCSI wants

4
drivers/scsi/cxlflash/lunmgt.c
View File

@ -252,7 +252,7 @@ int cxlflash_manage_lun(struct scsi_device *sdev,
* in unpacked, AFU-friendly format, and hang LUN reference in
* the sdev.
*/
lli->port_sel |= CHAN2PORT(chan);
lli->port_sel |= CHAN2PORTMASK(chan);
lli->lun_id[chan] = lun_to_lunid(sdev->lun);
sdev->hostdata = lli;
} else if (flags & DK_CXLFLASH_MANAGE_LUN_DISABLE_SUPERPIPE) {
@ -264,7 +264,7 @@ int cxlflash_manage_lun(struct scsi_device *sdev,
* tracking when no more references exist.
*/
sdev->hostdata = NULL;
lli->port_sel &= ~CHAN2PORT(chan);
lli->port_sel &= ~CHAN2PORTMASK(chan);
if (lli->port_sel == 0U)
lli->in_table = false;
}

13
drivers/scsi/cxlflash/main.c
View File

@ -365,7 +365,6 @@ static int wait_resp(struct afu *afu, struct afu_cmd *cmd)
*/
static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd)
{
u32 port_sel = scp->device->channel + 1;
struct cxlflash_cfg *cfg = shost_priv(scp->device->host);
struct afu_cmd *cmd = sc_to_afucz(scp);
struct device *dev = &cfg->dev->dev;
@ -388,7 +387,7 @@ static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd)
cmd->rcb.ctx_id = afu->ctx_hndl;
cmd->rcb.msi = SISL_MSI_RRQ_UPDATED;
cmd->rcb.port_sel = port_sel;
cmd->rcb.port_sel = CHAN2PORTMASK(scp->device->channel);
cmd->rcb.lun_id = lun_to_lunid(scp->device->lun);
cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID |
SISL_REQ_FLAGS_SUP_UNDERRUN |
@ -444,7 +443,6 @@ static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp)
struct device *dev = &cfg->dev->dev;
struct afu_cmd *cmd = sc_to_afucz(scp);
struct scatterlist *sg = scsi_sglist(scp);
u32 port_sel = scp->device->channel + 1;
u16 req_flags = SISL_REQ_FLAGS_SUP_UNDERRUN;
ulong lock_flags;
int nseg = 0;
@ -503,7 +501,7 @@ static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp)
cmd->rcb.ctx_id = afu->ctx_hndl;
cmd->rcb.msi = SISL_MSI_RRQ_UPDATED;
cmd->rcb.port_sel = port_sel;
cmd->rcb.port_sel = CHAN2PORTMASK(scp->device->channel);
cmd->rcb.lun_id = lun_to_lunid(scp->device->lun);
if (scp->sc_data_direction == DMA_TO_DEVICE)
@ -1558,7 +1556,8 @@ static int init_global(struct cxlflash_cfg *cfg)
writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel);
num_ports = 0;
} else {
writeq_be(BOTH_PORTS, &afu->afu_map->global.regs.afu_port_sel);
writeq_be(PORT_MASK(cfg->num_fc_ports),
&afu->afu_map->global.regs.afu_port_sel);
num_ports = cfg->num_fc_ports;
}
@ -2190,7 +2189,7 @@ static ssize_t lun_mode_store(struct device *dev,
if (afu->internal_lun)
shost->max_channel = 0;
else
shost->max_channel = cfg->num_fc_ports - 1;
shost->max_channel = PORTNUM2CHAN(cfg->num_fc_ports);
afu_reset(cfg);
scsi_scan_host(cfg->host);
@ -2529,7 +2528,7 @@ static int cxlflash_probe(struct pci_dev *pdev,
host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS;
host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET;
host->max_channel = NUM_FC_PORTS - 1;
host->max_channel = PORTNUM2CHAN(NUM_FC_PORTS);
host->unique_id = host->host_no;
host->max_cmd_len = CXLFLASH_MAX_CDB_LEN;

2
drivers/scsi/cxlflash/sislite.h
View File

@ -479,7 +479,7 @@ struct sisl_rht_entry_f1 {
#define PORT0 0x01U
#define PORT1 0x02U
#define BOTH_PORTS (PORT0 | PORT1)
#define PORT_MASK(_n) ((1 << (_n)) - 1)
/* AFU Sync Mode byte */
#define AFU_LW_SYNC 0x0U

2
drivers/scsi/cxlflash/superpipe.c
View File

@ -1933,7 +1933,7 @@ static int cxlflash_disk_direct_open(struct scsi_device *sdev, void *arg)
u64 lun_size = 0;
u64 last_lba = 0;
u64 rsrc_handle = -1;
u32 port = CHAN2PORT(sdev->channel);
u32 port = CHAN2PORTMASK(sdev->channel);
int rc = 0;

3
drivers/scsi/cxlflash/superpipe.h
View File

@ -33,9 +33,6 @@ extern struct cxlflash_global global;
#define MAX_SECTOR_UNIT 512 /* max_sector is in 512 byte multiples */
#define CHAN2PORT(_x) ((_x) + 1)
#define PORT2CHAN(_x) ((_x) - 1)
enum lun_mode {
MODE_NONE = 0,
MODE_VIRTUAL,

91
drivers/scsi/cxlflash/vlun.c
View File

@ -819,8 +819,8 @@ int cxlflash_vlun_resize(struct scsi_device *sdev,
void cxlflash_restore_luntable(struct cxlflash_cfg *cfg)
{
struct llun_info *lli, *temp;
u32 chan;
u32 lind;
int k;
struct afu *afu = cfg->afu;
struct device *dev = &cfg->dev->dev;
struct sisl_global_map __iomem *agm = &afu->afu_map->global;
@ -832,33 +832,41 @@ void cxlflash_restore_luntable(struct cxlflash_cfg *cfg)
continue;
lind = lli->lun_index;
dev_dbg(dev, "%s: Virtual LUNs on slot %d:\n", __func__, lind);
if (lli->port_sel == BOTH_PORTS) {
writeq_be(lli->lun_id[0], &agm->fc_port[0][lind]);
writeq_be(lli->lun_id[1], &agm->fc_port[1][lind]);
dev_dbg(dev, "%s: Virtual LUN on slot %d id0=%llx "
"id1=%llx\n", __func__, lind,
lli->lun_id[0], lli->lun_id[1]);
} else {
chan = PORT2CHAN(lli->port_sel);
writeq_be(lli->lun_id[chan], &agm->fc_port[chan][lind]);
dev_dbg(dev, "%s: Virtual LUN on slot %d chan=%d "
"id=%llx\n", __func__, lind, chan,
lli->lun_id[chan]);
for (k = 0; k < cfg->num_fc_ports; k++)
if (lli->port_sel & (1 << k)) {
writeq_be(lli->lun_id[k],
&agm->fc_port[k][lind]);
dev_dbg(dev, "\t%d=%llx\n", k, lli->lun_id[k]);
}
}
mutex_unlock(&global.mutex);
}
/**
* get_num_ports() - compute number of ports from port selection mask
* @psm: Port selection mask.
*
* Return: Population count of port selection mask
*/
static inline u8 get_num_ports(u32 psm)
{
static const u8 bits[16] = { 0, 1, 1, 2, 1, 2, 2, 3,
1, 2, 2, 3, 2, 3, 3, 4 };
return bits[psm & 0xf];
}
/**
* init_luntable() - write an entry in the LUN table
* @cfg: Internal structure associated with the host.
* @lli: Per adapter LUN information structure.
*
* On successful return, a LUN table entry is created.
* At the top for LUNs visible on both ports.
* At the bottom for LUNs visible only on one port.
* On successful return, a LUN table entry is created:
* - at the top for LUNs visible on multiple ports.
* - at the bottom for LUNs visible only on one port.
*
* Return: 0 on success, -errno on failure
*/
@ -866,7 +874,9 @@ static int init_luntable(struct cxlflash_cfg *cfg, struct llun_info *lli)
{
u32 chan;
u32 lind;
u32 nports;
int rc = 0;
int k;
struct afu *afu = cfg->afu;
struct device *dev = &cfg->dev->dev;
struct sisl_global_map __iomem *agm = &afu->afu_map->global;
@ -876,29 +886,46 @@ static int init_luntable(struct cxlflash_cfg *cfg, struct llun_info *lli)
if (lli->in_table)
goto out;
if (lli->port_sel == BOTH_PORTS) {
/*
* If this LUN is visible from both ports, we will put
* it in the top half of the LUN table.
*/
if ((cfg->promote_lun_index == cfg->last_lun_index[0]) ||
(cfg->promote_lun_index == cfg->last_lun_index[1])) {
rc = -ENOSPC;
nports = get_num_ports(lli->port_sel);
if (nports == 0 || nports > cfg->num_fc_ports) {
WARN(1, "Unsupported port configuration nports=%u", nports);
rc = -EIO;
goto out;
}
if (nports > 1) {
/*
* When LUN is visible from multiple ports, we will put
* it in the top half of the LUN table.
*/
for (k = 0; k < cfg->num_fc_ports; k++) {
if (!(lli->port_sel & (1 << k)))
continue;
if (cfg->promote_lun_index == cfg->last_lun_index[k]) {
rc = -ENOSPC;
goto out;
}
}
lind = lli->lun_index = cfg->promote_lun_index;
writeq_be(lli->lun_id[0], &agm->fc_port[0][lind]);
writeq_be(lli->lun_id[1], &agm->fc_port[1][lind]);
dev_dbg(dev, "%s: Virtual LUNs on slot %d:\n", __func__, lind);
for (k = 0; k < cfg->num_fc_ports; k++) {
if (!(lli->port_sel & (1 << k)))
continue;
writeq_be(lli->lun_id[k], &agm->fc_port[k][lind]);
dev_dbg(dev, "\t%d=%llx\n", k, lli->lun_id[k]);
}
cfg->promote_lun_index++;
dev_dbg(dev, "%s: Virtual LUN on slot %d id0=%llx id1=%llx\n",
__func__, lind, lli->lun_id[0], lli->lun_id[1]);
} else {
/*
* If this LUN is visible only from one port, we will put
* When LUN is visible only from one port, we will put
* it in the bottom half of the LUN table.
*/
chan = PORT2CHAN(lli->port_sel);
chan = PORTMASK2CHAN(lli->port_sel);
if (cfg->promote_lun_index == cfg->last_lun_index[chan]) {
rc = -ENOSPC;
goto out;
@ -907,7 +934,7 @@ static int init_luntable(struct cxlflash_cfg *cfg, struct llun_info *lli)
lind = lli->lun_index = cfg->last_lun_index[chan];
writeq_be(lli->lun_id[chan], &agm->fc_port[chan][lind]);
cfg->last_lun_index[chan]--;
dev_dbg(dev, "%s: Virtual LUN on slot %d chan=%d id=%llx\n",
dev_dbg(dev, "%s: Virtual LUNs on slot %d:\n\t%d=%llx\n",
__func__, lind, chan, lli->lun_id[chan]);
}
@ -1016,7 +1043,7 @@ int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg)
virt->last_lba = last_lba;
virt->rsrc_handle = rsrc_handle;
if (lli->port_sel == BOTH_PORTS)
if (get_num_ports(lli->port_sel) > 1)
virt->hdr.return_flags |= DK_CXLFLASH_ALL_PORTS_ACTIVE;
out:
if (likely(ctxi))