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linux-next/drivers/usb/wusbcore/wa-xfer.c
Paul Gortmaker f940fcd8ea usb: Add export.h for EXPORT_SYMBOL/THIS_MODULE where needed
With module.h being implicitly everywhere via device.h, the absence
of explicitly including something for EXPORT_SYMBOL went unnoticed.
Since we are heading to fix things up and clean module.h from the
device.h file, we need to explicitly include these files now.

Use the lightweight version of the header that has just THIS_MODULE
and EXPORT_SYMBOL variants.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:25 -04:00

1617 lines
46 KiB
C

/*
* WUSB Wire Adapter
* Data transfer and URB enqueing
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* How transfers work: get a buffer, break it up in segments (segment
* size is a multiple of the maxpacket size). For each segment issue a
* segment request (struct wa_xfer_*), then send the data buffer if
* out or nothing if in (all over the DTO endpoint).
*
* For each submitted segment request, a notification will come over
* the NEP endpoint and a transfer result (struct xfer_result) will
* arrive in the DTI URB. Read it, get the xfer ID, see if there is
* data coming (inbound transfer), schedule a read and handle it.
*
* Sounds simple, it is a pain to implement.
*
*
* ENTRY POINTS
*
* FIXME
*
* LIFE CYCLE / STATE DIAGRAM
*
* FIXME
*
* THIS CODE IS DISGUSTING
*
* Warned you are; it's my second try and still not happy with it.
*
* NOTES:
*
* - No iso
*
* - Supports DMA xfers, control, bulk and maybe interrupt
*
* - Does not recycle unused rpipes
*
* An rpipe is assigned to an endpoint the first time it is used,
* and then it's there, assigned, until the endpoint is disabled
* (destroyed [{h,d}wahc_op_ep_disable()]. The assignment of the
* rpipe to the endpoint is done under the wa->rpipe_sem semaphore
* (should be a mutex).
*
* Two methods it could be done:
*
* (a) set up a timer every time an rpipe's use count drops to 1
* (which means unused) or when a transfer ends. Reset the
* timer when a xfer is queued. If the timer expires, release
* the rpipe [see rpipe_ep_disable()].
*
* (b) when looking for free rpipes to attach [rpipe_get_by_ep()],
* when none are found go over the list, check their endpoint
* and their activity record (if no last-xfer-done-ts in the
* last x seconds) take it
*
* However, due to the fact that we have a set of limited
* resources (max-segments-at-the-same-time per xfer,
* xfers-per-ripe, blocks-per-rpipe, rpipes-per-host), at the end
* we are going to have to rebuild all this based on an scheduler,
* to where we have a list of transactions to do and based on the
* availability of the different required components (blocks,
* rpipes, segment slots, etc), we go scheduling them. Painful.
*/
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/hash.h>
#include <linux/ratelimit.h>
#include <linux/export.h>
#include "wa-hc.h"
#include "wusbhc.h"
enum {
WA_SEGS_MAX = 255,
};
enum wa_seg_status {
WA_SEG_NOTREADY,
WA_SEG_READY,
WA_SEG_DELAYED,
WA_SEG_SUBMITTED,
WA_SEG_PENDING,
WA_SEG_DTI_PENDING,
WA_SEG_DONE,
WA_SEG_ERROR,
WA_SEG_ABORTED,
};
static void wa_xfer_delayed_run(struct wa_rpipe *);
/*
* Life cycle governed by 'struct urb' (the refcount of the struct is
* that of the 'struct urb' and usb_free_urb() would free the whole
* struct).
*/
struct wa_seg {
struct urb urb;
struct urb *dto_urb; /* for data output? */
struct list_head list_node; /* for rpipe->req_list */
struct wa_xfer *xfer; /* out xfer */
u8 index; /* which segment we are */
enum wa_seg_status status;
ssize_t result; /* bytes xfered or error */
struct wa_xfer_hdr xfer_hdr;
u8 xfer_extra[]; /* xtra space for xfer_hdr_ctl */
};
static void wa_seg_init(struct wa_seg *seg)
{
/* usb_init_urb() repeats a lot of work, so we do it here */
kref_init(&seg->urb.kref);
}
/*
* Protected by xfer->lock
*
*/
struct wa_xfer {
struct kref refcnt;
struct list_head list_node;
spinlock_t lock;
u32 id;
struct wahc *wa; /* Wire adapter we are plugged to */
struct usb_host_endpoint *ep;
struct urb *urb; /* URB we are transferring for */
struct wa_seg **seg; /* transfer segments */
u8 segs, segs_submitted, segs_done;
unsigned is_inbound:1;
unsigned is_dma:1;
size_t seg_size;
int result;
gfp_t gfp; /* allocation mask */
struct wusb_dev *wusb_dev; /* for activity timestamps */
};
static inline void wa_xfer_init(struct wa_xfer *xfer)
{
kref_init(&xfer->refcnt);
INIT_LIST_HEAD(&xfer->list_node);
spin_lock_init(&xfer->lock);
}
/*
* Destroy a transfer structure
*
* Note that the xfer->seg[index] thingies follow the URB life cycle,
* so we need to put them, not free them.
*/
static void wa_xfer_destroy(struct kref *_xfer)
{
struct wa_xfer *xfer = container_of(_xfer, struct wa_xfer, refcnt);
if (xfer->seg) {
unsigned cnt;
for (cnt = 0; cnt < xfer->segs; cnt++) {
if (xfer->is_inbound)
usb_put_urb(xfer->seg[cnt]->dto_urb);
usb_put_urb(&xfer->seg[cnt]->urb);
}
}
kfree(xfer);
}
static void wa_xfer_get(struct wa_xfer *xfer)
{
kref_get(&xfer->refcnt);
}
static void wa_xfer_put(struct wa_xfer *xfer)
{
kref_put(&xfer->refcnt, wa_xfer_destroy);
}
/*
* xfer is referenced
*
* xfer->lock has to be unlocked
*
* We take xfer->lock for setting the result; this is a barrier
* against drivers/usb/core/hcd.c:unlink1() being called after we call
* usb_hcd_giveback_urb() and wa_urb_dequeue() trying to get a
* reference to the transfer.
*/
static void wa_xfer_giveback(struct wa_xfer *xfer)
{
unsigned long flags;
spin_lock_irqsave(&xfer->wa->xfer_list_lock, flags);
list_del_init(&xfer->list_node);
spin_unlock_irqrestore(&xfer->wa->xfer_list_lock, flags);
/* FIXME: segmentation broken -- kills DWA */
wusbhc_giveback_urb(xfer->wa->wusb, xfer->urb, xfer->result);
wa_put(xfer->wa);
wa_xfer_put(xfer);
}
/*
* xfer is referenced
*
* xfer->lock has to be unlocked
*/
static void wa_xfer_completion(struct wa_xfer *xfer)
{
if (xfer->wusb_dev)
wusb_dev_put(xfer->wusb_dev);
rpipe_put(xfer->ep->hcpriv);
wa_xfer_giveback(xfer);
}
/*
* If transfer is done, wrap it up and return true
*
* xfer->lock has to be locked
*/
static unsigned __wa_xfer_is_done(struct wa_xfer *xfer)
{
struct device *dev = &xfer->wa->usb_iface->dev;
unsigned result, cnt;
struct wa_seg *seg;
struct urb *urb = xfer->urb;
unsigned found_short = 0;
result = xfer->segs_done == xfer->segs_submitted;
if (result == 0)
goto out;
urb->actual_length = 0;
for (cnt = 0; cnt < xfer->segs; cnt++) {
seg = xfer->seg[cnt];
switch (seg->status) {
case WA_SEG_DONE:
if (found_short && seg->result > 0) {
dev_dbg(dev, "xfer %p#%u: bad short segments (%zu)\n",
xfer, cnt, seg->result);
urb->status = -EINVAL;
goto out;
}
urb->actual_length += seg->result;
if (seg->result < xfer->seg_size
&& cnt != xfer->segs-1)
found_short = 1;
dev_dbg(dev, "xfer %p#%u: DONE short %d "
"result %zu urb->actual_length %d\n",
xfer, seg->index, found_short, seg->result,
urb->actual_length);
break;
case WA_SEG_ERROR:
xfer->result = seg->result;
dev_dbg(dev, "xfer %p#%u: ERROR result %zu\n",
xfer, seg->index, seg->result);
goto out;
case WA_SEG_ABORTED:
dev_dbg(dev, "xfer %p#%u ABORTED: result %d\n",
xfer, seg->index, urb->status);
xfer->result = urb->status;
goto out;
default:
dev_warn(dev, "xfer %p#%u: is_done bad state %d\n",
xfer, cnt, seg->status);
xfer->result = -EINVAL;
goto out;
}
}
xfer->result = 0;
out:
return result;
}
/*
* Initialize a transfer's ID
*
* We need to use a sequential number; if we use the pointer or the
* hash of the pointer, it can repeat over sequential transfers and
* then it will confuse the HWA....wonder why in hell they put a 32
* bit handle in there then.
*/
static void wa_xfer_id_init(struct wa_xfer *xfer)
{
xfer->id = atomic_add_return(1, &xfer->wa->xfer_id_count);
}
/*
* Return the xfer's ID associated with xfer
*
* Need to generate a
*/
static u32 wa_xfer_id(struct wa_xfer *xfer)
{
return xfer->id;
}
/*
* Search for a transfer list ID on the HCD's URB list
*
* For 32 bit architectures, we use the pointer itself; for 64 bits, a
* 32-bit hash of the pointer.
*
* @returns NULL if not found.
*/
static struct wa_xfer *wa_xfer_get_by_id(struct wahc *wa, u32 id)
{
unsigned long flags;
struct wa_xfer *xfer_itr;
spin_lock_irqsave(&wa->xfer_list_lock, flags);
list_for_each_entry(xfer_itr, &wa->xfer_list, list_node) {
if (id == xfer_itr->id) {
wa_xfer_get(xfer_itr);
goto out;
}
}
xfer_itr = NULL;
out:
spin_unlock_irqrestore(&wa->xfer_list_lock, flags);
return xfer_itr;
}
struct wa_xfer_abort_buffer {
struct urb urb;
struct wa_xfer_abort cmd;
};
static void __wa_xfer_abort_cb(struct urb *urb)
{
struct wa_xfer_abort_buffer *b = urb->context;
usb_put_urb(&b->urb);
}
/*
* Aborts an ongoing transaction
*
* Assumes the transfer is referenced and locked and in a submitted
* state (mainly that there is an endpoint/rpipe assigned).
*
* The callback (see above) does nothing but freeing up the data by
* putting the URB. Because the URB is allocated at the head of the
* struct, the whole space we allocated is kfreed.
*
* We'll get an 'aborted transaction' xfer result on DTI, that'll
* politely ignore because at this point the transaction has been
* marked as aborted already.
*/
static void __wa_xfer_abort(struct wa_xfer *xfer)
{
int result;
struct device *dev = &xfer->wa->usb_iface->dev;
struct wa_xfer_abort_buffer *b;
struct wa_rpipe *rpipe = xfer->ep->hcpriv;
b = kmalloc(sizeof(*b), GFP_ATOMIC);
if (b == NULL)
goto error_kmalloc;
b->cmd.bLength = sizeof(b->cmd);
b->cmd.bRequestType = WA_XFER_ABORT;
b->cmd.wRPipe = rpipe->descr.wRPipeIndex;
b->cmd.dwTransferID = wa_xfer_id(xfer);
usb_init_urb(&b->urb);
usb_fill_bulk_urb(&b->urb, xfer->wa->usb_dev,
usb_sndbulkpipe(xfer->wa->usb_dev,
xfer->wa->dto_epd->bEndpointAddress),
&b->cmd, sizeof(b->cmd), __wa_xfer_abort_cb, b);
result = usb_submit_urb(&b->urb, GFP_ATOMIC);
if (result < 0)
goto error_submit;
return; /* callback frees! */
error_submit:
if (printk_ratelimit())
dev_err(dev, "xfer %p: Can't submit abort request: %d\n",
xfer, result);
kfree(b);
error_kmalloc:
return;
}
/*
*
* @returns < 0 on error, transfer segment request size if ok
*/
static ssize_t __wa_xfer_setup_sizes(struct wa_xfer *xfer,
enum wa_xfer_type *pxfer_type)
{
ssize_t result;
struct device *dev = &xfer->wa->usb_iface->dev;
size_t maxpktsize;
struct urb *urb = xfer->urb;
struct wa_rpipe *rpipe = xfer->ep->hcpriv;
switch (rpipe->descr.bmAttribute & 0x3) {
case USB_ENDPOINT_XFER_CONTROL:
*pxfer_type = WA_XFER_TYPE_CTL;
result = sizeof(struct wa_xfer_ctl);
break;
case USB_ENDPOINT_XFER_INT:
case USB_ENDPOINT_XFER_BULK:
*pxfer_type = WA_XFER_TYPE_BI;
result = sizeof(struct wa_xfer_bi);
break;
case USB_ENDPOINT_XFER_ISOC:
dev_err(dev, "FIXME: ISOC not implemented\n");
result = -ENOSYS;
goto error;
default:
/* never happens */
BUG();
result = -EINVAL; /* shut gcc up */
};
xfer->is_inbound = urb->pipe & USB_DIR_IN ? 1 : 0;
xfer->is_dma = urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP ? 1 : 0;
xfer->seg_size = le16_to_cpu(rpipe->descr.wBlocks)
* 1 << (xfer->wa->wa_descr->bRPipeBlockSize - 1);
/* Compute the segment size and make sure it is a multiple of
* the maxpktsize (WUSB1.0[8.3.3.1])...not really too much of
* a check (FIXME) */
maxpktsize = le16_to_cpu(rpipe->descr.wMaxPacketSize);
if (xfer->seg_size < maxpktsize) {
dev_err(dev, "HW BUG? seg_size %zu smaller than maxpktsize "
"%zu\n", xfer->seg_size, maxpktsize);
result = -EINVAL;
goto error;
}
xfer->seg_size = (xfer->seg_size / maxpktsize) * maxpktsize;
xfer->segs = (urb->transfer_buffer_length + xfer->seg_size - 1)
/ xfer->seg_size;
if (xfer->segs >= WA_SEGS_MAX) {
dev_err(dev, "BUG? ops, number of segments %d bigger than %d\n",
(int)(urb->transfer_buffer_length / xfer->seg_size),
WA_SEGS_MAX);
result = -EINVAL;
goto error;
}
if (xfer->segs == 0 && *pxfer_type == WA_XFER_TYPE_CTL)
xfer->segs = 1;
error:
return result;
}
/* Fill in the common request header and xfer-type specific data. */
static void __wa_xfer_setup_hdr0(struct wa_xfer *xfer,
struct wa_xfer_hdr *xfer_hdr0,
enum wa_xfer_type xfer_type,
size_t xfer_hdr_size)
{
struct wa_rpipe *rpipe = xfer->ep->hcpriv;
xfer_hdr0 = &xfer->seg[0]->xfer_hdr;
xfer_hdr0->bLength = xfer_hdr_size;
xfer_hdr0->bRequestType = xfer_type;
xfer_hdr0->wRPipe = rpipe->descr.wRPipeIndex;
xfer_hdr0->dwTransferID = wa_xfer_id(xfer);
xfer_hdr0->bTransferSegment = 0;
switch (xfer_type) {
case WA_XFER_TYPE_CTL: {
struct wa_xfer_ctl *xfer_ctl =
container_of(xfer_hdr0, struct wa_xfer_ctl, hdr);
xfer_ctl->bmAttribute = xfer->is_inbound ? 1 : 0;
memcpy(&xfer_ctl->baSetupData, xfer->urb->setup_packet,
sizeof(xfer_ctl->baSetupData));
break;
}
case WA_XFER_TYPE_BI:
break;
case WA_XFER_TYPE_ISO:
printk(KERN_ERR "FIXME: ISOC not implemented\n");
default:
BUG();
};
}
/*
* Callback for the OUT data phase of the segment request
*
* Check wa_seg_cb(); most comments also apply here because this
* function does almost the same thing and they work closely
* together.
*
* If the seg request has failed but this DTO phase has succeeded,
* wa_seg_cb() has already failed the segment and moved the
* status to WA_SEG_ERROR, so this will go through 'case 0' and
* effectively do nothing.
*/
static void wa_seg_dto_cb(struct urb *urb)
{
struct wa_seg *seg = urb->context;
struct wa_xfer *xfer = seg->xfer;
struct wahc *wa;
struct device *dev;
struct wa_rpipe *rpipe;
unsigned long flags;
unsigned rpipe_ready = 0;
u8 done = 0;
switch (urb->status) {
case 0:
spin_lock_irqsave(&xfer->lock, flags);
wa = xfer->wa;
dev = &wa->usb_iface->dev;
dev_dbg(dev, "xfer %p#%u: data out done (%d bytes)\n",
xfer, seg->index, urb->actual_length);
if (seg->status < WA_SEG_PENDING)
seg->status = WA_SEG_PENDING;
seg->result = urb->actual_length;
spin_unlock_irqrestore(&xfer->lock, flags);
break;
case -ECONNRESET: /* URB unlinked; no need to do anything */
case -ENOENT: /* as it was done by the who unlinked us */
break;
default: /* Other errors ... */
spin_lock_irqsave(&xfer->lock, flags);
wa = xfer->wa;
dev = &wa->usb_iface->dev;
rpipe = xfer->ep->hcpriv;
dev_dbg(dev, "xfer %p#%u: data out error %d\n",
xfer, seg->index, urb->status);
if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS,
EDC_ERROR_TIMEFRAME)){
dev_err(dev, "DTO: URB max acceptable errors "
"exceeded, resetting device\n");
wa_reset_all(wa);
}
if (seg->status != WA_SEG_ERROR) {
seg->status = WA_SEG_ERROR;
seg->result = urb->status;
xfer->segs_done++;
__wa_xfer_abort(xfer);
rpipe_ready = rpipe_avail_inc(rpipe);
done = __wa_xfer_is_done(xfer);
}
spin_unlock_irqrestore(&xfer->lock, flags);
if (done)
wa_xfer_completion(xfer);
if (rpipe_ready)
wa_xfer_delayed_run(rpipe);
}
}
/*
* Callback for the segment request
*
* If successful transition state (unless already transitioned or
* outbound transfer); otherwise, take a note of the error, mark this
* segment done and try completion.
*
* Note we don't access until we are sure that the transfer hasn't
* been cancelled (ECONNRESET, ENOENT), which could mean that
* seg->xfer could be already gone.
*
* We have to check before setting the status to WA_SEG_PENDING
* because sometimes the xfer result callback arrives before this
* callback (geeeeeeze), so it might happen that we are already in
* another state. As well, we don't set it if the transfer is inbound,
* as in that case, wa_seg_dto_cb will do it when the OUT data phase
* finishes.
*/
static void wa_seg_cb(struct urb *urb)
{
struct wa_seg *seg = urb->context;
struct wa_xfer *xfer = seg->xfer;
struct wahc *wa;
struct device *dev;
struct wa_rpipe *rpipe;
unsigned long flags;
unsigned rpipe_ready;
u8 done = 0;
switch (urb->status) {
case 0:
spin_lock_irqsave(&xfer->lock, flags);
wa = xfer->wa;
dev = &wa->usb_iface->dev;
dev_dbg(dev, "xfer %p#%u: request done\n", xfer, seg->index);
if (xfer->is_inbound && seg->status < WA_SEG_PENDING)
seg->status = WA_SEG_PENDING;
spin_unlock_irqrestore(&xfer->lock, flags);
break;
case -ECONNRESET: /* URB unlinked; no need to do anything */
case -ENOENT: /* as it was done by the who unlinked us */
break;
default: /* Other errors ... */
spin_lock_irqsave(&xfer->lock, flags);
wa = xfer->wa;
dev = &wa->usb_iface->dev;
rpipe = xfer->ep->hcpriv;
if (printk_ratelimit())
dev_err(dev, "xfer %p#%u: request error %d\n",
xfer, seg->index, urb->status);
if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS,
EDC_ERROR_TIMEFRAME)){
dev_err(dev, "DTO: URB max acceptable errors "
"exceeded, resetting device\n");
wa_reset_all(wa);
}
usb_unlink_urb(seg->dto_urb);
seg->status = WA_SEG_ERROR;
seg->result = urb->status;
xfer->segs_done++;
__wa_xfer_abort(xfer);
rpipe_ready = rpipe_avail_inc(rpipe);
done = __wa_xfer_is_done(xfer);
spin_unlock_irqrestore(&xfer->lock, flags);
if (done)
wa_xfer_completion(xfer);
if (rpipe_ready)
wa_xfer_delayed_run(rpipe);
}
}
/*
* Allocate the segs array and initialize each of them
*
* The segments are freed by wa_xfer_destroy() when the xfer use count
* drops to zero; however, because each segment is given the same life
* cycle as the USB URB it contains, it is actually freed by
* usb_put_urb() on the contained USB URB (twisted, eh?).
*/
static int __wa_xfer_setup_segs(struct wa_xfer *xfer, size_t xfer_hdr_size)
{
int result, cnt;
size_t alloc_size = sizeof(*xfer->seg[0])
- sizeof(xfer->seg[0]->xfer_hdr) + xfer_hdr_size;
struct usb_device *usb_dev = xfer->wa->usb_dev;
const struct usb_endpoint_descriptor *dto_epd = xfer->wa->dto_epd;
struct wa_seg *seg;
size_t buf_itr, buf_size, buf_itr_size;
result = -ENOMEM;
xfer->seg = kcalloc(xfer->segs, sizeof(xfer->seg[0]), GFP_ATOMIC);
if (xfer->seg == NULL)
goto error_segs_kzalloc;
buf_itr = 0;
buf_size = xfer->urb->transfer_buffer_length;
for (cnt = 0; cnt < xfer->segs; cnt++) {
seg = xfer->seg[cnt] = kzalloc(alloc_size, GFP_ATOMIC);
if (seg == NULL)
goto error_seg_kzalloc;
wa_seg_init(seg);
seg->xfer = xfer;
seg->index = cnt;
usb_fill_bulk_urb(&seg->urb, usb_dev,
usb_sndbulkpipe(usb_dev,
dto_epd->bEndpointAddress),
&seg->xfer_hdr, xfer_hdr_size,
wa_seg_cb, seg);
buf_itr_size = buf_size > xfer->seg_size ?
xfer->seg_size : buf_size;
if (xfer->is_inbound == 0 && buf_size > 0) {
seg->dto_urb = usb_alloc_urb(0, GFP_ATOMIC);
if (seg->dto_urb == NULL)
goto error_dto_alloc;
usb_fill_bulk_urb(
seg->dto_urb, usb_dev,
usb_sndbulkpipe(usb_dev,
dto_epd->bEndpointAddress),
NULL, 0, wa_seg_dto_cb, seg);
if (xfer->is_dma) {
seg->dto_urb->transfer_dma =
xfer->urb->transfer_dma + buf_itr;
seg->dto_urb->transfer_flags |=
URB_NO_TRANSFER_DMA_MAP;
} else
seg->dto_urb->transfer_buffer =
xfer->urb->transfer_buffer + buf_itr;
seg->dto_urb->transfer_buffer_length = buf_itr_size;
}
seg->status = WA_SEG_READY;
buf_itr += buf_itr_size;
buf_size -= buf_itr_size;
}
return 0;
error_dto_alloc:
kfree(xfer->seg[cnt]);
cnt--;
error_seg_kzalloc:
/* use the fact that cnt is left at were it failed */
for (; cnt > 0; cnt--) {
if (xfer->is_inbound == 0)
kfree(xfer->seg[cnt]->dto_urb);
kfree(xfer->seg[cnt]);
}
error_segs_kzalloc:
return result;
}
/*
* Allocates all the stuff needed to submit a transfer
*
* Breaks the whole data buffer in a list of segments, each one has a
* structure allocated to it and linked in xfer->seg[index]
*
* FIXME: merge setup_segs() and the last part of this function, no
* need to do two for loops when we could run everything in a
* single one
*/
static int __wa_xfer_setup(struct wa_xfer *xfer, struct urb *urb)
{
int result;
struct device *dev = &xfer->wa->usb_iface->dev;
enum wa_xfer_type xfer_type = 0; /* shut up GCC */
size_t xfer_hdr_size, cnt, transfer_size;
struct wa_xfer_hdr *xfer_hdr0, *xfer_hdr;
result = __wa_xfer_setup_sizes(xfer, &xfer_type);
if (result < 0)
goto error_setup_sizes;
xfer_hdr_size = result;
result = __wa_xfer_setup_segs(xfer, xfer_hdr_size);
if (result < 0) {
dev_err(dev, "xfer %p: Failed to allocate %d segments: %d\n",
xfer, xfer->segs, result);
goto error_setup_segs;
}
/* Fill the first header */
xfer_hdr0 = &xfer->seg[0]->xfer_hdr;
wa_xfer_id_init(xfer);
__wa_xfer_setup_hdr0(xfer, xfer_hdr0, xfer_type, xfer_hdr_size);
/* Fill remainig headers */
xfer_hdr = xfer_hdr0;
transfer_size = urb->transfer_buffer_length;
xfer_hdr0->dwTransferLength = transfer_size > xfer->seg_size ?
xfer->seg_size : transfer_size;
transfer_size -= xfer->seg_size;
for (cnt = 1; cnt < xfer->segs; cnt++) {
xfer_hdr = &xfer->seg[cnt]->xfer_hdr;
memcpy(xfer_hdr, xfer_hdr0, xfer_hdr_size);
xfer_hdr->bTransferSegment = cnt;
xfer_hdr->dwTransferLength = transfer_size > xfer->seg_size ?
cpu_to_le32(xfer->seg_size)
: cpu_to_le32(transfer_size);
xfer->seg[cnt]->status = WA_SEG_READY;
transfer_size -= xfer->seg_size;
}
xfer_hdr->bTransferSegment |= 0x80; /* this is the last segment */
result = 0;
error_setup_segs:
error_setup_sizes:
return result;
}
/*
*
*
* rpipe->seg_lock is held!
*/
static int __wa_seg_submit(struct wa_rpipe *rpipe, struct wa_xfer *xfer,
struct wa_seg *seg)
{
int result;
result = usb_submit_urb(&seg->urb, GFP_ATOMIC);
if (result < 0) {
printk(KERN_ERR "xfer %p#%u: REQ submit failed: %d\n",
xfer, seg->index, result);
goto error_seg_submit;
}
if (seg->dto_urb) {
result = usb_submit_urb(seg->dto_urb, GFP_ATOMIC);
if (result < 0) {
printk(KERN_ERR "xfer %p#%u: DTO submit failed: %d\n",
xfer, seg->index, result);
goto error_dto_submit;
}
}
seg->status = WA_SEG_SUBMITTED;
rpipe_avail_dec(rpipe);
return 0;
error_dto_submit:
usb_unlink_urb(&seg->urb);
error_seg_submit:
seg->status = WA_SEG_ERROR;
seg->result = result;
return result;
}
/*
* Execute more queued request segments until the maximum concurrent allowed
*
* The ugly unlock/lock sequence on the error path is needed as the
* xfer->lock normally nests the seg_lock and not viceversa.
*
*/
static void wa_xfer_delayed_run(struct wa_rpipe *rpipe)
{
int result;
struct device *dev = &rpipe->wa->usb_iface->dev;
struct wa_seg *seg;
struct wa_xfer *xfer;
unsigned long flags;
spin_lock_irqsave(&rpipe->seg_lock, flags);
while (atomic_read(&rpipe->segs_available) > 0
&& !list_empty(&rpipe->seg_list)) {
seg = list_entry(rpipe->seg_list.next, struct wa_seg,
list_node);
list_del(&seg->list_node);
xfer = seg->xfer;
result = __wa_seg_submit(rpipe, xfer, seg);
dev_dbg(dev, "xfer %p#%u submitted from delayed [%d segments available] %d\n",
xfer, seg->index, atomic_read(&rpipe->segs_available), result);
if (unlikely(result < 0)) {
spin_unlock_irqrestore(&rpipe->seg_lock, flags);
spin_lock_irqsave(&xfer->lock, flags);
__wa_xfer_abort(xfer);
xfer->segs_done++;
spin_unlock_irqrestore(&xfer->lock, flags);
spin_lock_irqsave(&rpipe->seg_lock, flags);
}
}
spin_unlock_irqrestore(&rpipe->seg_lock, flags);
}
/*
*
* xfer->lock is taken
*
* On failure submitting we just stop submitting and return error;
* wa_urb_enqueue_b() will execute the completion path
*/
static int __wa_xfer_submit(struct wa_xfer *xfer)
{
int result;
struct wahc *wa = xfer->wa;
struct device *dev = &wa->usb_iface->dev;
unsigned cnt;
struct wa_seg *seg;
unsigned long flags;
struct wa_rpipe *rpipe = xfer->ep->hcpriv;
size_t maxrequests = le16_to_cpu(rpipe->descr.wRequests);
u8 available;
u8 empty;
spin_lock_irqsave(&wa->xfer_list_lock, flags);
list_add_tail(&xfer->list_node, &wa->xfer_list);
spin_unlock_irqrestore(&wa->xfer_list_lock, flags);
BUG_ON(atomic_read(&rpipe->segs_available) > maxrequests);
result = 0;
spin_lock_irqsave(&rpipe->seg_lock, flags);
for (cnt = 0; cnt < xfer->segs; cnt++) {
available = atomic_read(&rpipe->segs_available);
empty = list_empty(&rpipe->seg_list);
seg = xfer->seg[cnt];
dev_dbg(dev, "xfer %p#%u: available %u empty %u (%s)\n",
xfer, cnt, available, empty,
available == 0 || !empty ? "delayed" : "submitted");
if (available == 0 || !empty) {
dev_dbg(dev, "xfer %p#%u: delayed\n", xfer, cnt);
seg->status = WA_SEG_DELAYED;
list_add_tail(&seg->list_node, &rpipe->seg_list);
} else {
result = __wa_seg_submit(rpipe, xfer, seg);
if (result < 0) {
__wa_xfer_abort(xfer);
goto error_seg_submit;
}
}
xfer->segs_submitted++;
}
error_seg_submit:
spin_unlock_irqrestore(&rpipe->seg_lock, flags);
return result;
}
/*
* Second part of a URB/transfer enqueuement
*
* Assumes this comes from wa_urb_enqueue() [maybe through
* wa_urb_enqueue_run()]. At this point:
*
* xfer->wa filled and refcounted
* xfer->ep filled with rpipe refcounted if
* delayed == 0
* xfer->urb filled and refcounted (this is the case when called
* from wa_urb_enqueue() as we come from usb_submit_urb()
* and when called by wa_urb_enqueue_run(), as we took an
* extra ref dropped by _run() after we return).
* xfer->gfp filled
*
* If we fail at __wa_xfer_submit(), then we just check if we are done
* and if so, we run the completion procedure. However, if we are not
* yet done, we do nothing and wait for the completion handlers from
* the submitted URBs or from the xfer-result path to kick in. If xfer
* result never kicks in, the xfer will timeout from the USB code and
* dequeue() will be called.
*/
static void wa_urb_enqueue_b(struct wa_xfer *xfer)
{
int result;
unsigned long flags;
struct urb *urb = xfer->urb;
struct wahc *wa = xfer->wa;
struct wusbhc *wusbhc = wa->wusb;
struct wusb_dev *wusb_dev;
unsigned done;
result = rpipe_get_by_ep(wa, xfer->ep, urb, xfer->gfp);
if (result < 0)
goto error_rpipe_get;
result = -ENODEV;
/* FIXME: segmentation broken -- kills DWA */
mutex_lock(&wusbhc->mutex); /* get a WUSB dev */
if (urb->dev == NULL) {
mutex_unlock(&wusbhc->mutex);
goto error_dev_gone;
}
wusb_dev = __wusb_dev_get_by_usb_dev(wusbhc, urb->dev);
if (wusb_dev == NULL) {
mutex_unlock(&wusbhc->mutex);
goto error_dev_gone;
}
mutex_unlock(&wusbhc->mutex);
spin_lock_irqsave(&xfer->lock, flags);
xfer->wusb_dev = wusb_dev;
result = urb->status;
if (urb->status != -EINPROGRESS)
goto error_dequeued;
result = __wa_xfer_setup(xfer, urb);
if (result < 0)
goto error_xfer_setup;
result = __wa_xfer_submit(xfer);
if (result < 0)
goto error_xfer_submit;
spin_unlock_irqrestore(&xfer->lock, flags);
return;
/* this is basically wa_xfer_completion() broken up wa_xfer_giveback()
* does a wa_xfer_put() that will call wa_xfer_destroy() and clean
* upundo setup().
*/
error_xfer_setup:
error_dequeued:
spin_unlock_irqrestore(&xfer->lock, flags);
/* FIXME: segmentation broken, kills DWA */
if (wusb_dev)
wusb_dev_put(wusb_dev);
error_dev_gone:
rpipe_put(xfer->ep->hcpriv);
error_rpipe_get:
xfer->result = result;
wa_xfer_giveback(xfer);
return;
error_xfer_submit:
done = __wa_xfer_is_done(xfer);
xfer->result = result;
spin_unlock_irqrestore(&xfer->lock, flags);
if (done)
wa_xfer_completion(xfer);
}
/*
* Execute the delayed transfers in the Wire Adapter @wa
*
* We need to be careful here, as dequeue() could be called in the
* middle. That's why we do the whole thing under the
* wa->xfer_list_lock. If dequeue() jumps in, it first locks urb->lock
* and then checks the list -- so as we would be acquiring in inverse
* order, we just drop the lock once we have the xfer and reacquire it
* later.
*/
void wa_urb_enqueue_run(struct work_struct *ws)
{
struct wahc *wa = container_of(ws, struct wahc, xfer_work);
struct wa_xfer *xfer, *next;
struct urb *urb;
spin_lock_irq(&wa->xfer_list_lock);
list_for_each_entry_safe(xfer, next, &wa->xfer_delayed_list,
list_node) {
list_del_init(&xfer->list_node);
spin_unlock_irq(&wa->xfer_list_lock);
urb = xfer->urb;
wa_urb_enqueue_b(xfer);
usb_put_urb(urb); /* taken when queuing */
spin_lock_irq(&wa->xfer_list_lock);
}
spin_unlock_irq(&wa->xfer_list_lock);
}
EXPORT_SYMBOL_GPL(wa_urb_enqueue_run);
/*
* Submit a transfer to the Wire Adapter in a delayed way
*
* The process of enqueuing involves possible sleeps() [see
* enqueue_b(), for the rpipe_get() and the mutex_lock()]. If we are
* in an atomic section, we defer the enqueue_b() call--else we call direct.
*
* @urb: We own a reference to it done by the HCI Linux USB stack that
* will be given up by calling usb_hcd_giveback_urb() or by
* returning error from this function -> ergo we don't have to
* refcount it.
*/
int wa_urb_enqueue(struct wahc *wa, struct usb_host_endpoint *ep,
struct urb *urb, gfp_t gfp)
{
int result;
struct device *dev = &wa->usb_iface->dev;
struct wa_xfer *xfer;
unsigned long my_flags;
unsigned cant_sleep = irqs_disabled() | in_atomic();
if (urb->transfer_buffer == NULL
&& !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
&& urb->transfer_buffer_length != 0) {
dev_err(dev, "BUG? urb %p: NULL xfer buffer & NODMA\n", urb);
dump_stack();
}
result = -ENOMEM;
xfer = kzalloc(sizeof(*xfer), gfp);
if (xfer == NULL)
goto error_kmalloc;
result = -ENOENT;
if (urb->status != -EINPROGRESS) /* cancelled */
goto error_dequeued; /* before starting? */
wa_xfer_init(xfer);
xfer->wa = wa_get(wa);
xfer->urb = urb;
xfer->gfp = gfp;
xfer->ep = ep;
urb->hcpriv = xfer;
dev_dbg(dev, "xfer %p urb %p pipe 0x%02x [%d bytes] %s %s %s\n",
xfer, urb, urb->pipe, urb->transfer_buffer_length,
urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP ? "dma" : "nodma",
urb->pipe & USB_DIR_IN ? "inbound" : "outbound",
cant_sleep ? "deferred" : "inline");
if (cant_sleep) {
usb_get_urb(urb);
spin_lock_irqsave(&wa->xfer_list_lock, my_flags);
list_add_tail(&xfer->list_node, &wa->xfer_delayed_list);
spin_unlock_irqrestore(&wa->xfer_list_lock, my_flags);
queue_work(wusbd, &wa->xfer_work);
} else {
wa_urb_enqueue_b(xfer);
}
return 0;
error_dequeued:
kfree(xfer);
error_kmalloc:
return result;
}
EXPORT_SYMBOL_GPL(wa_urb_enqueue);
/*
* Dequeue a URB and make sure uwb_hcd_giveback_urb() [completion
* handler] is called.
*
* Until a transfer goes successfully through wa_urb_enqueue() it
* needs to be dequeued with completion calling; when stuck in delayed
* or before wa_xfer_setup() is called, we need to do completion.
*
* not setup If there is no hcpriv yet, that means that that enqueue
* still had no time to set the xfer up. Because
* urb->status should be other than -EINPROGRESS,
* enqueue() will catch that and bail out.
*
* If the transfer has gone through setup, we just need to clean it
* up. If it has gone through submit(), we have to abort it [with an
* asynch request] and then make sure we cancel each segment.
*
*/
int wa_urb_dequeue(struct wahc *wa, struct urb *urb)
{
unsigned long flags, flags2;
struct wa_xfer *xfer;
struct wa_seg *seg;
struct wa_rpipe *rpipe;
unsigned cnt;
unsigned rpipe_ready = 0;
xfer = urb->hcpriv;
if (xfer == NULL) {
/* NOthing setup yet enqueue will see urb->status !=
* -EINPROGRESS (by hcd layer) and bail out with
* error, no need to do completion
*/
BUG_ON(urb->status == -EINPROGRESS);
goto out;
}
spin_lock_irqsave(&xfer->lock, flags);
rpipe = xfer->ep->hcpriv;
/* Check the delayed list -> if there, release and complete */
spin_lock_irqsave(&wa->xfer_list_lock, flags2);
if (!list_empty(&xfer->list_node) && xfer->seg == NULL)
goto dequeue_delayed;
spin_unlock_irqrestore(&wa->xfer_list_lock, flags2);
if (xfer->seg == NULL) /* still hasn't reached */
goto out_unlock; /* setup(), enqueue_b() completes */
/* Ok, the xfer is in flight already, it's been setup and submitted.*/
__wa_xfer_abort(xfer);
for (cnt = 0; cnt < xfer->segs; cnt++) {
seg = xfer->seg[cnt];
switch (seg->status) {
case WA_SEG_NOTREADY:
case WA_SEG_READY:
printk(KERN_ERR "xfer %p#%u: dequeue bad state %u\n",
xfer, cnt, seg->status);
WARN_ON(1);
break;
case WA_SEG_DELAYED:
seg->status = WA_SEG_ABORTED;
spin_lock_irqsave(&rpipe->seg_lock, flags2);
list_del(&seg->list_node);
xfer->segs_done++;
rpipe_ready = rpipe_avail_inc(rpipe);
spin_unlock_irqrestore(&rpipe->seg_lock, flags2);
break;
case WA_SEG_SUBMITTED:
seg->status = WA_SEG_ABORTED;
usb_unlink_urb(&seg->urb);
if (xfer->is_inbound == 0)
usb_unlink_urb(seg->dto_urb);
xfer->segs_done++;
rpipe_ready = rpipe_avail_inc(rpipe);
break;
case WA_SEG_PENDING:
seg->status = WA_SEG_ABORTED;
xfer->segs_done++;
rpipe_ready = rpipe_avail_inc(rpipe);
break;
case WA_SEG_DTI_PENDING:
usb_unlink_urb(wa->dti_urb);
seg->status = WA_SEG_ABORTED;
xfer->segs_done++;
rpipe_ready = rpipe_avail_inc(rpipe);
break;
case WA_SEG_DONE:
case WA_SEG_ERROR:
case WA_SEG_ABORTED:
break;
}
}
xfer->result = urb->status; /* -ENOENT or -ECONNRESET */
__wa_xfer_is_done(xfer);
spin_unlock_irqrestore(&xfer->lock, flags);
wa_xfer_completion(xfer);
if (rpipe_ready)
wa_xfer_delayed_run(rpipe);
return 0;
out_unlock:
spin_unlock_irqrestore(&xfer->lock, flags);
out:
return 0;
dequeue_delayed:
list_del_init(&xfer->list_node);
spin_unlock_irqrestore(&wa->xfer_list_lock, flags2);
xfer->result = urb->status;
spin_unlock_irqrestore(&xfer->lock, flags);
wa_xfer_giveback(xfer);
usb_put_urb(urb); /* we got a ref in enqueue() */
return 0;
}
EXPORT_SYMBOL_GPL(wa_urb_dequeue);
/*
* Translation from WA status codes (WUSB1.0 Table 8.15) to errno
* codes
*
* Positive errno values are internal inconsistencies and should be
* flagged louder. Negative are to be passed up to the user in the
* normal way.
*
* @status: USB WA status code -- high two bits are stripped.
*/
static int wa_xfer_status_to_errno(u8 status)
{
int errno;
u8 real_status = status;
static int xlat[] = {
[WA_XFER_STATUS_SUCCESS] = 0,
[WA_XFER_STATUS_HALTED] = -EPIPE,
[WA_XFER_STATUS_DATA_BUFFER_ERROR] = -ENOBUFS,
[WA_XFER_STATUS_BABBLE] = -EOVERFLOW,
[WA_XFER_RESERVED] = EINVAL,
[WA_XFER_STATUS_NOT_FOUND] = 0,
[WA_XFER_STATUS_INSUFFICIENT_RESOURCE] = -ENOMEM,
[WA_XFER_STATUS_TRANSACTION_ERROR] = -EILSEQ,
[WA_XFER_STATUS_ABORTED] = -EINTR,
[WA_XFER_STATUS_RPIPE_NOT_READY] = EINVAL,
[WA_XFER_INVALID_FORMAT] = EINVAL,
[WA_XFER_UNEXPECTED_SEGMENT_NUMBER] = EINVAL,
[WA_XFER_STATUS_RPIPE_TYPE_MISMATCH] = EINVAL,
};
status &= 0x3f;
if (status == 0)
return 0;
if (status >= ARRAY_SIZE(xlat)) {
printk_ratelimited(KERN_ERR "%s(): BUG? "
"Unknown WA transfer status 0x%02x\n",
__func__, real_status);
return -EINVAL;
}
errno = xlat[status];
if (unlikely(errno > 0)) {
printk_ratelimited(KERN_ERR "%s(): BUG? "
"Inconsistent WA status: 0x%02x\n",
__func__, real_status);
errno = -errno;
}
return errno;
}
/*
* Process a xfer result completion message
*
* inbound transfers: need to schedule a DTI read
*
* FIXME: this functio needs to be broken up in parts
*/
static void wa_xfer_result_chew(struct wahc *wa, struct wa_xfer *xfer)
{
int result;
struct device *dev = &wa->usb_iface->dev;
unsigned long flags;
u8 seg_idx;
struct wa_seg *seg;
struct wa_rpipe *rpipe;
struct wa_xfer_result *xfer_result = wa->xfer_result;
u8 done = 0;
u8 usb_status;
unsigned rpipe_ready = 0;
spin_lock_irqsave(&xfer->lock, flags);
seg_idx = xfer_result->bTransferSegment & 0x7f;
if (unlikely(seg_idx >= xfer->segs))
goto error_bad_seg;
seg = xfer->seg[seg_idx];
rpipe = xfer->ep->hcpriv;
usb_status = xfer_result->bTransferStatus;
dev_dbg(dev, "xfer %p#%u: bTransferStatus 0x%02x (seg %u)\n",
xfer, seg_idx, usb_status, seg->status);
if (seg->status == WA_SEG_ABORTED
|| seg->status == WA_SEG_ERROR) /* already handled */
goto segment_aborted;
if (seg->status == WA_SEG_SUBMITTED) /* ops, got here */
seg->status = WA_SEG_PENDING; /* before wa_seg{_dto}_cb() */
if (seg->status != WA_SEG_PENDING) {
if (printk_ratelimit())
dev_err(dev, "xfer %p#%u: Bad segment state %u\n",
xfer, seg_idx, seg->status);
seg->status = WA_SEG_PENDING; /* workaround/"fix" it */
}
if (usb_status & 0x80) {
seg->result = wa_xfer_status_to_errno(usb_status);
dev_err(dev, "DTI: xfer %p#%u failed (0x%02x)\n",
xfer, seg->index, usb_status);
goto error_complete;
}
/* FIXME: we ignore warnings, tally them for stats */
if (usb_status & 0x40) /* Warning?... */
usb_status = 0; /* ... pass */
if (xfer->is_inbound) { /* IN data phase: read to buffer */
seg->status = WA_SEG_DTI_PENDING;
BUG_ON(wa->buf_in_urb->status == -EINPROGRESS);
if (xfer->is_dma) {
wa->buf_in_urb->transfer_dma =
xfer->urb->transfer_dma
+ seg_idx * xfer->seg_size;
wa->buf_in_urb->transfer_flags
|= URB_NO_TRANSFER_DMA_MAP;
} else {
wa->buf_in_urb->transfer_buffer =
xfer->urb->transfer_buffer
+ seg_idx * xfer->seg_size;
wa->buf_in_urb->transfer_flags
&= ~URB_NO_TRANSFER_DMA_MAP;
}
wa->buf_in_urb->transfer_buffer_length =
le32_to_cpu(xfer_result->dwTransferLength);
wa->buf_in_urb->context = seg;
result = usb_submit_urb(wa->buf_in_urb, GFP_ATOMIC);
if (result < 0)
goto error_submit_buf_in;
} else {
/* OUT data phase, complete it -- */
seg->status = WA_SEG_DONE;
seg->result = le32_to_cpu(xfer_result->dwTransferLength);
xfer->segs_done++;
rpipe_ready = rpipe_avail_inc(rpipe);
done = __wa_xfer_is_done(xfer);
}
spin_unlock_irqrestore(&xfer->lock, flags);
if (done)
wa_xfer_completion(xfer);
if (rpipe_ready)
wa_xfer_delayed_run(rpipe);
return;
error_submit_buf_in:
if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
dev_err(dev, "DTI: URB max acceptable errors "
"exceeded, resetting device\n");
wa_reset_all(wa);
}
if (printk_ratelimit())
dev_err(dev, "xfer %p#%u: can't submit DTI data phase: %d\n",
xfer, seg_idx, result);
seg->result = result;
error_complete:
seg->status = WA_SEG_ERROR;
xfer->segs_done++;
rpipe_ready = rpipe_avail_inc(rpipe);
__wa_xfer_abort(xfer);
done = __wa_xfer_is_done(xfer);
spin_unlock_irqrestore(&xfer->lock, flags);
if (done)
wa_xfer_completion(xfer);
if (rpipe_ready)
wa_xfer_delayed_run(rpipe);
return;
error_bad_seg:
spin_unlock_irqrestore(&xfer->lock, flags);
wa_urb_dequeue(wa, xfer->urb);
if (printk_ratelimit())
dev_err(dev, "xfer %p#%u: bad segment\n", xfer, seg_idx);
if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
dev_err(dev, "DTI: URB max acceptable errors "
"exceeded, resetting device\n");
wa_reset_all(wa);
}
return;
segment_aborted:
/* nothing to do, as the aborter did the completion */
spin_unlock_irqrestore(&xfer->lock, flags);
}
/*
* Callback for the IN data phase
*
* If successful transition state; otherwise, take a note of the
* error, mark this segment done and try completion.
*
* Note we don't access until we are sure that the transfer hasn't
* been cancelled (ECONNRESET, ENOENT), which could mean that
* seg->xfer could be already gone.
*/
static void wa_buf_in_cb(struct urb *urb)
{
struct wa_seg *seg = urb->context;
struct wa_xfer *xfer = seg->xfer;
struct wahc *wa;
struct device *dev;
struct wa_rpipe *rpipe;
unsigned rpipe_ready;
unsigned long flags;
u8 done = 0;
switch (urb->status) {
case 0:
spin_lock_irqsave(&xfer->lock, flags);
wa = xfer->wa;
dev = &wa->usb_iface->dev;
rpipe = xfer->ep->hcpriv;
dev_dbg(dev, "xfer %p#%u: data in done (%zu bytes)\n",
xfer, seg->index, (size_t)urb->actual_length);
seg->status = WA_SEG_DONE;
seg->result = urb->actual_length;
xfer->segs_done++;
rpipe_ready = rpipe_avail_inc(rpipe);
done = __wa_xfer_is_done(xfer);
spin_unlock_irqrestore(&xfer->lock, flags);
if (done)
wa_xfer_completion(xfer);
if (rpipe_ready)
wa_xfer_delayed_run(rpipe);
break;
case -ECONNRESET: /* URB unlinked; no need to do anything */
case -ENOENT: /* as it was done by the who unlinked us */
break;
default: /* Other errors ... */
spin_lock_irqsave(&xfer->lock, flags);
wa = xfer->wa;
dev = &wa->usb_iface->dev;
rpipe = xfer->ep->hcpriv;
if (printk_ratelimit())
dev_err(dev, "xfer %p#%u: data in error %d\n",
xfer, seg->index, urb->status);
if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS,
EDC_ERROR_TIMEFRAME)){
dev_err(dev, "DTO: URB max acceptable errors "
"exceeded, resetting device\n");
wa_reset_all(wa);
}
seg->status = WA_SEG_ERROR;
seg->result = urb->status;
xfer->segs_done++;
rpipe_ready = rpipe_avail_inc(rpipe);
__wa_xfer_abort(xfer);
done = __wa_xfer_is_done(xfer);
spin_unlock_irqrestore(&xfer->lock, flags);
if (done)
wa_xfer_completion(xfer);
if (rpipe_ready)
wa_xfer_delayed_run(rpipe);
}
}
/*
* Handle an incoming transfer result buffer
*
* Given a transfer result buffer, it completes the transfer (possibly
* scheduling and buffer in read) and then resubmits the DTI URB for a
* new transfer result read.
*
*
* The xfer_result DTI URB state machine
*
* States: OFF | RXR (Read-Xfer-Result) | RBI (Read-Buffer-In)
*
* We start in OFF mode, the first xfer_result notification [through
* wa_handle_notif_xfer()] moves us to RXR by posting the DTI-URB to
* read.
*
* We receive a buffer -- if it is not a xfer_result, we complain and
* repost the DTI-URB. If it is a xfer_result then do the xfer seg
* request accounting. If it is an IN segment, we move to RBI and post
* a BUF-IN-URB to the right buffer. The BUF-IN-URB callback will
* repost the DTI-URB and move to RXR state. if there was no IN
* segment, it will repost the DTI-URB.
*
* We go back to OFF when we detect a ENOENT or ESHUTDOWN (or too many
* errors) in the URBs.
*/
static void wa_xfer_result_cb(struct urb *urb)
{
int result;
struct wahc *wa = urb->context;
struct device *dev = &wa->usb_iface->dev;
struct wa_xfer_result *xfer_result;
u32 xfer_id;
struct wa_xfer *xfer;
u8 usb_status;
BUG_ON(wa->dti_urb != urb);
switch (wa->dti_urb->status) {
case 0:
/* We have a xfer result buffer; check it */
dev_dbg(dev, "DTI: xfer result %d bytes at %p\n",
urb->actual_length, urb->transfer_buffer);
if (wa->dti_urb->actual_length != sizeof(*xfer_result)) {
dev_err(dev, "DTI Error: xfer result--bad size "
"xfer result (%d bytes vs %zu needed)\n",
urb->actual_length, sizeof(*xfer_result));
break;
}
xfer_result = wa->xfer_result;
if (xfer_result->hdr.bLength != sizeof(*xfer_result)) {
dev_err(dev, "DTI Error: xfer result--"
"bad header length %u\n",
xfer_result->hdr.bLength);
break;
}
if (xfer_result->hdr.bNotifyType != WA_XFER_RESULT) {
dev_err(dev, "DTI Error: xfer result--"
"bad header type 0x%02x\n",
xfer_result->hdr.bNotifyType);
break;
}
usb_status = xfer_result->bTransferStatus & 0x3f;
if (usb_status == WA_XFER_STATUS_ABORTED
|| usb_status == WA_XFER_STATUS_NOT_FOUND)
/* taken care of already */
break;
xfer_id = xfer_result->dwTransferID;
xfer = wa_xfer_get_by_id(wa, xfer_id);
if (xfer == NULL) {
/* FIXME: transaction might have been cancelled */
dev_err(dev, "DTI Error: xfer result--"
"unknown xfer 0x%08x (status 0x%02x)\n",
xfer_id, usb_status);
break;
}
wa_xfer_result_chew(wa, xfer);
wa_xfer_put(xfer);
break;
case -ENOENT: /* (we killed the URB)...so, no broadcast */
case -ESHUTDOWN: /* going away! */
dev_dbg(dev, "DTI: going down! %d\n", urb->status);
goto out;
default:
/* Unknown error */
if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS,
EDC_ERROR_TIMEFRAME)) {
dev_err(dev, "DTI: URB max acceptable errors "
"exceeded, resetting device\n");
wa_reset_all(wa);
goto out;
}
if (printk_ratelimit())
dev_err(dev, "DTI: URB error %d\n", urb->status);
break;
}
/* Resubmit the DTI URB */
result = usb_submit_urb(wa->dti_urb, GFP_ATOMIC);
if (result < 0) {
dev_err(dev, "DTI Error: Could not submit DTI URB (%d), "
"resetting\n", result);
wa_reset_all(wa);
}
out:
return;
}
/*
* Transfer complete notification
*
* Called from the notif.c code. We get a notification on EP2 saying
* that some endpoint has some transfer result data available. We are
* about to read it.
*
* To speed up things, we always have a URB reading the DTI URB; we
* don't really set it up and start it until the first xfer complete
* notification arrives, which is what we do here.
*
* Follow up in wa_xfer_result_cb(), as that's where the whole state
* machine starts.
*
* So here we just initialize the DTI URB for reading transfer result
* notifications and also the buffer-in URB, for reading buffers. Then
* we just submit the DTI URB.
*
* @wa shall be referenced
*/
void wa_handle_notif_xfer(struct wahc *wa, struct wa_notif_hdr *notif_hdr)
{
int result;
struct device *dev = &wa->usb_iface->dev;
struct wa_notif_xfer *notif_xfer;
const struct usb_endpoint_descriptor *dti_epd = wa->dti_epd;
notif_xfer = container_of(notif_hdr, struct wa_notif_xfer, hdr);
BUG_ON(notif_hdr->bNotifyType != WA_NOTIF_TRANSFER);
if ((0x80 | notif_xfer->bEndpoint) != dti_epd->bEndpointAddress) {
/* FIXME: hardcoded limitation, adapt */
dev_err(dev, "BUG: DTI ep is %u, not %u (hack me)\n",
notif_xfer->bEndpoint, dti_epd->bEndpointAddress);
goto error;
}
if (wa->dti_urb != NULL) /* DTI URB already started */
goto out;
wa->dti_urb = usb_alloc_urb(0, GFP_KERNEL);
if (wa->dti_urb == NULL) {
dev_err(dev, "Can't allocate DTI URB\n");
goto error_dti_urb_alloc;
}
usb_fill_bulk_urb(
wa->dti_urb, wa->usb_dev,
usb_rcvbulkpipe(wa->usb_dev, 0x80 | notif_xfer->bEndpoint),
wa->xfer_result, wa->xfer_result_size,
wa_xfer_result_cb, wa);
wa->buf_in_urb = usb_alloc_urb(0, GFP_KERNEL);
if (wa->buf_in_urb == NULL) {
dev_err(dev, "Can't allocate BUF-IN URB\n");
goto error_buf_in_urb_alloc;
}
usb_fill_bulk_urb(
wa->buf_in_urb, wa->usb_dev,
usb_rcvbulkpipe(wa->usb_dev, 0x80 | notif_xfer->bEndpoint),
NULL, 0, wa_buf_in_cb, wa);
result = usb_submit_urb(wa->dti_urb, GFP_KERNEL);
if (result < 0) {
dev_err(dev, "DTI Error: Could not submit DTI URB (%d), "
"resetting\n", result);
goto error_dti_urb_submit;
}
out:
return;
error_dti_urb_submit:
usb_put_urb(wa->buf_in_urb);
error_buf_in_urb_alloc:
usb_put_urb(wa->dti_urb);
wa->dti_urb = NULL;
error_dti_urb_alloc:
error:
wa_reset_all(wa);
}