![Heiko Carstens](/assets/img/avatar_default.png)
Fix several compile errors on s390 caused by splitting module.h. Some include additions [e.g. qdio_setup.c, zfcp_qdio.c] are in anticipation of pending changes queued for s390 that increase the modular use footprint. [PG: added additional obvious changes since Heiko's original patch] Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
512 lines
14 KiB
C
512 lines
14 KiB
C
/*
|
|
* zfcp device driver
|
|
*
|
|
* Setup and helper functions to access QDIO.
|
|
*
|
|
* Copyright IBM Corporation 2002, 2010
|
|
*/
|
|
|
|
#define KMSG_COMPONENT "zfcp"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include "zfcp_ext.h"
|
|
#include "zfcp_qdio.h"
|
|
|
|
#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
|
|
|
|
static bool enable_multibuffer;
|
|
module_param_named(datarouter, enable_multibuffer, bool, 0400);
|
|
MODULE_PARM_DESC(datarouter, "Enable hardware data router support");
|
|
|
|
static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
|
|
{
|
|
int pos;
|
|
|
|
for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) {
|
|
sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
|
|
if (!sbal[pos])
|
|
return -ENOMEM;
|
|
}
|
|
for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++)
|
|
if (pos % QBUFF_PER_PAGE)
|
|
sbal[pos] = sbal[pos - 1] + 1;
|
|
return 0;
|
|
}
|
|
|
|
static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id,
|
|
unsigned int qdio_err)
|
|
{
|
|
struct zfcp_adapter *adapter = qdio->adapter;
|
|
|
|
dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
|
|
|
|
if (qdio_err & QDIO_ERROR_SLSB_STATE) {
|
|
zfcp_qdio_siosl(adapter);
|
|
zfcp_erp_adapter_shutdown(adapter, 0, id);
|
|
return;
|
|
}
|
|
zfcp_erp_adapter_reopen(adapter,
|
|
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
|
|
ZFCP_STATUS_COMMON_ERP_FAILED, id);
|
|
}
|
|
|
|
static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
|
|
{
|
|
int i, sbal_idx;
|
|
|
|
for (i = first; i < first + cnt; i++) {
|
|
sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
|
|
memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
|
|
}
|
|
}
|
|
|
|
/* this needs to be called prior to updating the queue fill level */
|
|
static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
|
|
{
|
|
unsigned long long now, span;
|
|
int used;
|
|
|
|
now = get_clock_monotonic();
|
|
span = (now - qdio->req_q_time) >> 12;
|
|
used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
|
|
qdio->req_q_util += used * span;
|
|
qdio->req_q_time = now;
|
|
}
|
|
|
|
static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
|
|
int queue_no, int idx, int count,
|
|
unsigned long parm)
|
|
{
|
|
struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
|
|
|
|
if (unlikely(qdio_err)) {
|
|
zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
|
|
return;
|
|
}
|
|
|
|
/* cleanup all SBALs being program-owned now */
|
|
zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
|
|
|
|
spin_lock_irq(&qdio->stat_lock);
|
|
zfcp_qdio_account(qdio);
|
|
spin_unlock_irq(&qdio->stat_lock);
|
|
atomic_add(count, &qdio->req_q_free);
|
|
wake_up(&qdio->req_q_wq);
|
|
}
|
|
|
|
static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
|
|
int queue_no, int idx, int count,
|
|
unsigned long parm)
|
|
{
|
|
struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
|
|
struct zfcp_adapter *adapter = qdio->adapter;
|
|
struct qdio_buffer_element *sbale;
|
|
int sbal_no, sbal_idx;
|
|
void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
|
|
u64 req_id;
|
|
u8 scount;
|
|
|
|
if (unlikely(qdio_err)) {
|
|
memset(pl, 0, ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
|
|
if (zfcp_adapter_multi_buffer_active(adapter)) {
|
|
sbale = qdio->res_q[idx]->element;
|
|
req_id = (u64) sbale->addr;
|
|
scount = sbale->scount + 1; /* incl. signaling SBAL */
|
|
|
|
for (sbal_no = 0; sbal_no < scount; sbal_no++) {
|
|
sbal_idx = (idx + sbal_no) %
|
|
QDIO_MAX_BUFFERS_PER_Q;
|
|
pl[sbal_no] = qdio->res_q[sbal_idx];
|
|
}
|
|
zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
|
|
}
|
|
zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* go through all SBALs from input queue currently
|
|
* returned by QDIO layer
|
|
*/
|
|
for (sbal_no = 0; sbal_no < count; sbal_no++) {
|
|
sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
|
|
/* go through all SBALEs of SBAL */
|
|
zfcp_fsf_reqid_check(qdio, sbal_idx);
|
|
}
|
|
|
|
/*
|
|
* put SBALs back to response queue
|
|
*/
|
|
if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
|
|
zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2");
|
|
}
|
|
|
|
static struct qdio_buffer_element *
|
|
zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
|
|
{
|
|
struct qdio_buffer_element *sbale;
|
|
|
|
/* set last entry flag in current SBALE of current SBAL */
|
|
sbale = zfcp_qdio_sbale_curr(qdio, q_req);
|
|
sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY;
|
|
|
|
/* don't exceed last allowed SBAL */
|
|
if (q_req->sbal_last == q_req->sbal_limit)
|
|
return NULL;
|
|
|
|
/* set chaining flag in first SBALE of current SBAL */
|
|
sbale = zfcp_qdio_sbale_req(qdio, q_req);
|
|
sbale->sflags |= SBAL_SFLAGS0_MORE_SBALS;
|
|
|
|
/* calculate index of next SBAL */
|
|
q_req->sbal_last++;
|
|
q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
|
|
|
|
/* keep this requests number of SBALs up-to-date */
|
|
q_req->sbal_number++;
|
|
BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
|
|
|
|
/* start at first SBALE of new SBAL */
|
|
q_req->sbale_curr = 0;
|
|
|
|
/* set storage-block type for new SBAL */
|
|
sbale = zfcp_qdio_sbale_curr(qdio, q_req);
|
|
sbale->sflags |= q_req->sbtype;
|
|
|
|
return sbale;
|
|
}
|
|
|
|
static struct qdio_buffer_element *
|
|
zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
|
|
{
|
|
if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
|
|
return zfcp_qdio_sbal_chain(qdio, q_req);
|
|
q_req->sbale_curr++;
|
|
return zfcp_qdio_sbale_curr(qdio, q_req);
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
|
|
* @qdio: pointer to struct zfcp_qdio
|
|
* @q_req: pointer to struct zfcp_qdio_req
|
|
* @sg: scatter-gather list
|
|
* @max_sbals: upper bound for number of SBALs to be used
|
|
* Returns: zero or -EINVAL on error
|
|
*/
|
|
int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
|
|
struct scatterlist *sg)
|
|
{
|
|
struct qdio_buffer_element *sbale;
|
|
|
|
/* set storage-block type for this request */
|
|
sbale = zfcp_qdio_sbale_req(qdio, q_req);
|
|
sbale->sflags |= q_req->sbtype;
|
|
|
|
for (; sg; sg = sg_next(sg)) {
|
|
sbale = zfcp_qdio_sbale_next(qdio, q_req);
|
|
if (!sbale) {
|
|
atomic_inc(&qdio->req_q_full);
|
|
zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
|
|
q_req->sbal_number);
|
|
return -EINVAL;
|
|
}
|
|
sbale->addr = sg_virt(sg);
|
|
sbale->length = sg->length;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
|
|
{
|
|
spin_lock_irq(&qdio->req_q_lock);
|
|
if (atomic_read(&qdio->req_q_free) ||
|
|
!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
|
|
return 1;
|
|
spin_unlock_irq(&qdio->req_q_lock);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
|
|
* @qdio: pointer to struct zfcp_qdio
|
|
*
|
|
* The req_q_lock must be held by the caller of this function, and
|
|
* this function may only be called from process context; it will
|
|
* sleep when waiting for a free sbal.
|
|
*
|
|
* Returns: 0 on success, -EIO if there is no free sbal after waiting.
|
|
*/
|
|
int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
|
|
{
|
|
long ret;
|
|
|
|
spin_unlock_irq(&qdio->req_q_lock);
|
|
ret = wait_event_interruptible_timeout(qdio->req_q_wq,
|
|
zfcp_qdio_sbal_check(qdio), 5 * HZ);
|
|
|
|
if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
|
|
return -EIO;
|
|
|
|
if (ret > 0)
|
|
return 0;
|
|
|
|
if (!ret) {
|
|
atomic_inc(&qdio->req_q_full);
|
|
/* assume hanging outbound queue, try queue recovery */
|
|
zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1");
|
|
}
|
|
|
|
spin_lock_irq(&qdio->req_q_lock);
|
|
return -EIO;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
|
|
* @qdio: pointer to struct zfcp_qdio
|
|
* @q_req: pointer to struct zfcp_qdio_req
|
|
* Returns: 0 on success, error otherwise
|
|
*/
|
|
int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
|
|
{
|
|
int retval;
|
|
u8 sbal_number = q_req->sbal_number;
|
|
|
|
spin_lock(&qdio->stat_lock);
|
|
zfcp_qdio_account(qdio);
|
|
spin_unlock(&qdio->stat_lock);
|
|
|
|
retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
|
|
q_req->sbal_first, sbal_number);
|
|
|
|
if (unlikely(retval)) {
|
|
zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
|
|
sbal_number);
|
|
return retval;
|
|
}
|
|
|
|
/* account for transferred buffers */
|
|
atomic_sub(sbal_number, &qdio->req_q_free);
|
|
qdio->req_q_idx += sbal_number;
|
|
qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
|
|
struct zfcp_qdio *qdio)
|
|
{
|
|
memset(id, 0, sizeof(*id));
|
|
id->cdev = qdio->adapter->ccw_device;
|
|
id->q_format = QDIO_ZFCP_QFMT;
|
|
memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
|
|
ASCEBC(id->adapter_name, 8);
|
|
id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
|
|
if (enable_multibuffer)
|
|
id->qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE;
|
|
id->no_input_qs = 1;
|
|
id->no_output_qs = 1;
|
|
id->input_handler = zfcp_qdio_int_resp;
|
|
id->output_handler = zfcp_qdio_int_req;
|
|
id->int_parm = (unsigned long) qdio;
|
|
id->input_sbal_addr_array = (void **) (qdio->res_q);
|
|
id->output_sbal_addr_array = (void **) (qdio->req_q);
|
|
id->scan_threshold =
|
|
QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
|
|
* @adapter: pointer to struct zfcp_adapter
|
|
* Returns: -ENOMEM on memory allocation error or return value from
|
|
* qdio_allocate
|
|
*/
|
|
static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
|
|
{
|
|
struct qdio_initialize init_data;
|
|
|
|
if (zfcp_qdio_buffers_enqueue(qdio->req_q) ||
|
|
zfcp_qdio_buffers_enqueue(qdio->res_q))
|
|
return -ENOMEM;
|
|
|
|
zfcp_qdio_setup_init_data(&init_data, qdio);
|
|
init_waitqueue_head(&qdio->req_q_wq);
|
|
|
|
return qdio_allocate(&init_data);
|
|
}
|
|
|
|
/**
|
|
* zfcp_close_qdio - close qdio queues for an adapter
|
|
* @qdio: pointer to structure zfcp_qdio
|
|
*/
|
|
void zfcp_qdio_close(struct zfcp_qdio *qdio)
|
|
{
|
|
struct zfcp_adapter *adapter = qdio->adapter;
|
|
int idx, count;
|
|
|
|
if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
|
|
return;
|
|
|
|
/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
|
|
spin_lock_irq(&qdio->req_q_lock);
|
|
atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
|
|
spin_unlock_irq(&qdio->req_q_lock);
|
|
|
|
wake_up(&qdio->req_q_wq);
|
|
|
|
qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
|
|
|
|
/* cleanup used outbound sbals */
|
|
count = atomic_read(&qdio->req_q_free);
|
|
if (count < QDIO_MAX_BUFFERS_PER_Q) {
|
|
idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
|
|
count = QDIO_MAX_BUFFERS_PER_Q - count;
|
|
zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
|
|
}
|
|
qdio->req_q_idx = 0;
|
|
atomic_set(&qdio->req_q_free, 0);
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_open - prepare and initialize response queue
|
|
* @qdio: pointer to struct zfcp_qdio
|
|
* Returns: 0 on success, otherwise -EIO
|
|
*/
|
|
int zfcp_qdio_open(struct zfcp_qdio *qdio)
|
|
{
|
|
struct qdio_buffer_element *sbale;
|
|
struct qdio_initialize init_data;
|
|
struct zfcp_adapter *adapter = qdio->adapter;
|
|
struct ccw_device *cdev = adapter->ccw_device;
|
|
struct qdio_ssqd_desc ssqd;
|
|
int cc;
|
|
|
|
if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
|
|
return -EIO;
|
|
|
|
atomic_clear_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
|
|
&qdio->adapter->status);
|
|
|
|
zfcp_qdio_setup_init_data(&init_data, qdio);
|
|
|
|
if (qdio_establish(&init_data))
|
|
goto failed_establish;
|
|
|
|
if (qdio_get_ssqd_desc(init_data.cdev, &ssqd))
|
|
goto failed_qdio;
|
|
|
|
if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
|
|
atomic_set_mask(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
|
|
&qdio->adapter->status);
|
|
|
|
if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
|
|
atomic_set_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
|
|
qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
|
|
} else {
|
|
atomic_clear_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
|
|
qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
|
|
}
|
|
|
|
qdio->max_sbale_per_req =
|
|
ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
|
|
- 2;
|
|
if (qdio_activate(cdev))
|
|
goto failed_qdio;
|
|
|
|
for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
|
|
sbale = &(qdio->res_q[cc]->element[0]);
|
|
sbale->length = 0;
|
|
sbale->eflags = SBAL_EFLAGS_LAST_ENTRY;
|
|
sbale->sflags = 0;
|
|
sbale->addr = NULL;
|
|
}
|
|
|
|
if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
|
|
goto failed_qdio;
|
|
|
|
/* set index of first available SBALS / number of available SBALS */
|
|
qdio->req_q_idx = 0;
|
|
atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
|
|
atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
|
|
|
|
if (adapter->scsi_host) {
|
|
adapter->scsi_host->sg_tablesize = qdio->max_sbale_per_req;
|
|
adapter->scsi_host->max_sectors = qdio->max_sbale_per_req * 8;
|
|
}
|
|
|
|
return 0;
|
|
|
|
failed_qdio:
|
|
qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
|
|
failed_establish:
|
|
dev_err(&cdev->dev,
|
|
"Setting up the QDIO connection to the FCP adapter failed\n");
|
|
return -EIO;
|
|
}
|
|
|
|
void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
|
|
{
|
|
int p;
|
|
|
|
if (!qdio)
|
|
return;
|
|
|
|
if (qdio->adapter->ccw_device)
|
|
qdio_free(qdio->adapter->ccw_device);
|
|
|
|
for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) {
|
|
free_page((unsigned long) qdio->req_q[p]);
|
|
free_page((unsigned long) qdio->res_q[p]);
|
|
}
|
|
|
|
kfree(qdio);
|
|
}
|
|
|
|
int zfcp_qdio_setup(struct zfcp_adapter *adapter)
|
|
{
|
|
struct zfcp_qdio *qdio;
|
|
|
|
qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
|
|
if (!qdio)
|
|
return -ENOMEM;
|
|
|
|
qdio->adapter = adapter;
|
|
|
|
if (zfcp_qdio_allocate(qdio)) {
|
|
zfcp_qdio_destroy(qdio);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
spin_lock_init(&qdio->req_q_lock);
|
|
spin_lock_init(&qdio->stat_lock);
|
|
|
|
adapter->qdio = qdio;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_siosl - Trigger logging in FCP channel
|
|
* @adapter: The zfcp_adapter where to trigger logging
|
|
*
|
|
* Call the cio siosl function to trigger hardware logging. This
|
|
* wrapper function sets a flag to ensure hardware logging is only
|
|
* triggered once before going through qdio shutdown.
|
|
*
|
|
* The triggers are always run from qdio tasklet context, so no
|
|
* additional synchronization is necessary.
|
|
*/
|
|
void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
|
|
{
|
|
int rc;
|
|
|
|
if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
|
|
return;
|
|
|
|
rc = ccw_device_siosl(adapter->ccw_device);
|
|
if (!rc)
|
|
atomic_set_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
|
|
&adapter->status);
|
|
}
|