On Thu, Feb 14, 2019 at 10:48:15AM +0100, Stefan Wahren wrote:
> Hi Stanislaw,
>
> Am 14.02.19 um 10:25 schrieb Stanislaw Gruszka:
> > On Thu, Feb 14, 2019 at 07:49:57AM +0100, Stefan Wahren wrote:
> >> Hi Stanislaw,
> >>
> >>> Stanislaw Gruszka <sgrus...@redhat.com> hat am 12. Februar 2019 um 10:30
> >>> geschrieben:
> >>>
> >>>
> >>>
> >>> In usb_sg_init() urb->num_sgs is set 0 for sg_tablesize = 0 controllers.
> >>> In mt76 we set urb->num_sgs to 1. I thought it is fine, but now I think
> >>> this is bug. We can fix that without changing allocation method and
> >>> still use SG allocation. Attached patch do this, please check if it works
> >>> on rpi. Patch is on top of your error path fixes.
> >> your patch didn't apply cleanly to yesterdays next. After some minor
> >> manual fixup, i was able to build them and here are the results starting
> >> from boot (please ignore the invalid time in the kernel log):
> >> https://gist.github.com/lategoodbye/33bd5bc75b9fc935faa231bc472defa8
> > I think this is due to urb->transfer_length and sg[0]->length mismatch,
> > which should be addressed by my other patch. I'm attaching the patch
> > rebased on -next with this line integrated, please test.
> >
> > But there could be other bug's in mt76-usb SG code.
I found another bug in mt76usb SG code. We set sg->offset bigger than
PAGE_SIZE that actually make sg point to memory in different page than
sg->page. Correcting this with another patch that avoid using sg
mapping with sg->length > PAGE_SIZE, fixed mt76x0u with AMD IOMMU:
https://bugzilla.kernel.org/show_bug.cgi?id=202241
I'm attaching 3 patches, they should also fix issue on rpi.
It's also possible that only 2 patches are sufficient:
0001-mt76usb-do-not-set-urb-num_sgs-to-1-for-non-SG-usb-h.patch
0003-mt76usb-do-not-use-compound-head-page-for-SG-I-O.patch
to fix the issue, if doing dma_map_{page,sg} is fine with
sg->offset == 0 and sg->length bigger than one page.
Please test, thanks.
Stanislaw
>From 49654f00b5071602a9182f0cb488f346f01ec5ac Mon Sep 17 00:00:00 2001
From: Stanislaw Gruszka <sgrus...@redhat.com>
Date: Fri, 15 Feb 2019 07:39:00 +0100
Subject: [PATCH v5 1/3] mt76usb: do not set urb->num_sgs to 1 for non SG usb
host drivers
Track number of segments in mt76u_buf structure and do not
submit urbs with urb->num_sgs = 1 if usb host driver
sg_tablesize is zero.
This suppose fix problem of mt76 not working with some usb
host controllers like dwc2.
Signed-off-by: Stanislaw Gruszka <sgrus...@redhat.com>
---
drivers/net/wireless/mediatek/mt76/mt76.h | 1 +
drivers/net/wireless/mediatek/mt76/usb.c | 57 +++++++++++++++++++------------
2 files changed, 37 insertions(+), 21 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h
b/drivers/net/wireless/mediatek/mt76/mt76.h
index 2bb9db4ed80a..97ad0270f8a6 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -86,6 +86,7 @@ struct mt76_queue_buf {
struct mt76u_buf {
struct mt76_dev *dev;
struct urb *urb;
+ int num_sgs;
size_t len;
bool done;
};
diff --git a/drivers/net/wireless/mediatek/mt76/usb.c
b/drivers/net/wireless/mediatek/mt76/usb.c
index 6a2507524c6c..4f92732506cc 100644
--- a/drivers/net/wireless/mediatek/mt76/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/usb.c
@@ -297,14 +297,14 @@ mt76u_fill_rx_sg(struct mt76_dev *dev, struct mt76u_buf
*buf,
if (i < nsgs) {
int j;
- for (j = nsgs; j < urb->num_sgs; j++)
+ for (j = nsgs; j < buf->num_sgs; j++)
skb_free_frag(sg_virt(&urb->sg[j]));
- urb->num_sgs = i;
+ buf->num_sgs = i;
}
- urb->num_sgs = max_t(int, i, urb->num_sgs);
- buf->len = urb->num_sgs * sglen,
- sg_init_marker(urb->sg, urb->num_sgs);
+ buf->num_sgs = max_t(int, i, buf->num_sgs);
+ buf->len = buf->num_sgs * sglen,
+ sg_init_marker(urb->sg, buf->num_sgs);
return i ? : -ENOMEM;
}
@@ -323,6 +323,7 @@ int mt76u_buf_alloc(struct mt76_dev *dev, struct mt76u_buf
*buf,
sg_init_table(buf->urb->sg, nsgs);
buf->dev = dev;
+ buf->num_sgs = nsgs;
return mt76u_fill_rx_sg(dev, buf, nsgs, len, sglen);
}
@@ -333,15 +334,16 @@ void mt76u_buf_free(struct mt76u_buf *buf)
struct urb *urb = buf->urb;
int i;
- for (i = 0; i < urb->num_sgs; i++)
+ for (i = 0; i < buf->num_sgs; i++)
skb_free_frag(sg_virt(&urb->sg[i]));
usb_free_urb(buf->urb);
}
EXPORT_SYMBOL_GPL(mt76u_buf_free);
-int mt76u_submit_buf(struct mt76_dev *dev, int dir, int index,
- struct mt76u_buf *buf, gfp_t gfp,
- usb_complete_t complete_fn, void *context)
+static void
+mt76u_fill_bulk_urb(struct mt76_dev *dev, int dir, int index,
+ struct mt76u_buf *buf, usb_complete_t complete_fn,
+ void *context)
{
struct usb_interface *intf = to_usb_interface(dev->dev);
struct usb_device *udev = interface_to_usbdev(intf);
@@ -352,12 +354,28 @@ int mt76u_submit_buf(struct mt76_dev *dev, int dir, int
index,
else
pipe = usb_sndbulkpipe(udev, dev->usb.out_ep[index]);
- usb_fill_bulk_urb(buf->urb, udev, pipe, NULL, buf->len,
- complete_fn, context);
- trace_submit_urb(dev, buf->urb);
+ usb_fill_bulk_urb(buf->urb, udev, pipe, NULL, buf->len, complete_fn,
+ context);
+
+ if (udev->bus->sg_tablesize > 0) {
+ buf->urb->num_sgs = buf->num_sgs;
+ } else {
+ WARN_ON_ONCE(buf->num_sgs != 1);
+ /* See usb_sg_init() */
+ buf->urb->num_sgs = 0;
+ if (!PageHighMem(sg_page(buf->urb->sg)))
+ buf->urb->transfer_buffer = sg_virt(buf->urb->sg);
+ }
+}
+int mt76u_submit_buf(struct mt76_dev *dev, int dir, int index,
+ struct mt76u_buf *buf, gfp_t gfp,
+ usb_complete_t complete_fn, void *context)
+{
+ mt76u_fill_bulk_urb(dev, dir, index, buf, complete_fn, context);
return usb_submit_urb(buf->urb, gfp);
}
+
EXPORT_SYMBOL_GPL(mt76u_submit_buf);
static inline struct mt76u_buf
@@ -667,10 +685,11 @@ static void mt76u_complete_tx(struct urb *urb)
}
static int
-mt76u_tx_build_sg(struct sk_buff *skb, struct urb *urb)
+mt76u_tx_build_sg(struct sk_buff *skb, struct mt76u_buf *buf)
{
int nsgs = 1 + skb_shinfo(skb)->nr_frags;
struct sk_buff *iter;
+ struct urb *urb = buf->urb;
skb_walk_frags(skb, iter)
nsgs += 1 + skb_shinfo(iter)->nr_frags;
@@ -679,7 +698,8 @@ mt76u_tx_build_sg(struct sk_buff *skb, struct urb *urb)
nsgs = min_t(int, MT_SG_MAX_SIZE, nsgs);
sg_init_marker(urb->sg, nsgs);
- urb->num_sgs = nsgs;
+ buf->num_sgs = nsgs;
+ buf->len = skb->len;
return skb_to_sgvec_nomark(skb, urb->sg, 0, skb->len);
}
@@ -689,12 +709,9 @@ mt76u_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue
*q,
struct sk_buff *skb, struct mt76_wcid *wcid,
struct ieee80211_sta *sta)
{
- struct usb_interface *intf = to_usb_interface(dev->dev);
- struct usb_device *udev = interface_to_usbdev(intf);
u8 ep = q2ep(q->hw_idx);
struct mt76u_buf *buf;
u16 idx = q->tail;
- unsigned int pipe;
int err;
if (q->queued == q->ndesc)
@@ -708,13 +725,11 @@ mt76u_tx_queue_skb(struct mt76_dev *dev, struct
mt76_queue *q,
buf = &q->entry[idx].ubuf;
buf->done = false;
- err = mt76u_tx_build_sg(skb, buf->urb);
+ err = mt76u_tx_build_sg(skb, buf);
if (err < 0)
return err;
- pipe = usb_sndbulkpipe(udev, dev->usb.out_ep[ep]);
- usb_fill_bulk_urb(buf->urb, udev, pipe, NULL, skb->len,
- mt76u_complete_tx, buf);
+ mt76u_fill_bulk_urb(dev, USB_DIR_OUT, ep, buf, mt76u_complete_tx, buf);
q->tail = (q->tail + 1) % q->ndesc;
q->entry[idx].skb = skb;
--
2.7.5
>From 3307dc2b47ea4442adebf09466e6bb9fdd6479db Mon Sep 17 00:00:00 2001
From: Stanislaw Gruszka <sgrus...@redhat.com>
Date: Mon, 11 Feb 2019 09:08:40 +0100
Subject: [PATCH v5 2/3] mt76x02u: use usb_bulk_msg to upload firmware
We don't need to send firmware data asynchronously, much simpler is just
use synchronous usb_bulk_msg().
Signed-off-by: Stanislaw Gruszka <sgrus...@redhat.com>
---
drivers/net/wireless/mediatek/mt76/mt76.h | 13 ++++++
.../net/wireless/mediatek/mt76/mt76x02_usb_mcu.c | 52 +++++++---------------
drivers/net/wireless/mediatek/mt76/usb.c | 1 -
3 files changed, 29 insertions(+), 37 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h
b/drivers/net/wireless/mediatek/mt76/mt76.h
index 97ad0270f8a6..364f3571c033 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -733,6 +733,19 @@ static inline bool mt76u_check_sg(struct mt76_dev *dev)
udev->speed == USB_SPEED_WIRELESS));
}
+static inline int
+mt76u_bulk_msg(struct mt76_dev *dev, void *data, int len, int timeout)
+{
+ struct usb_interface *intf = to_usb_interface(dev->dev);
+ struct usb_device *udev = interface_to_usbdev(intf);
+ struct mt76_usb *usb = &dev->usb;
+ unsigned int pipe;
+ int sent;
+
+ pipe = usb_sndbulkpipe(udev, usb->out_ep[MT_EP_OUT_INBAND_CMD]);
+ return usb_bulk_msg(udev, pipe, data, len, &sent, timeout);
+}
+
int mt76u_vendor_request(struct mt76_dev *dev, u8 req,
u8 req_type, u16 val, u16 offset,
void *buf, size_t len);
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c
b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c
index 6db789f90269..2ca393e267af 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c
@@ -121,18 +121,14 @@ static int
__mt76x02u_mcu_send_msg(struct mt76_dev *dev, struct sk_buff *skb,
int cmd, bool wait_resp)
{
- struct usb_interface *intf = to_usb_interface(dev->dev);
- struct usb_device *udev = interface_to_usbdev(intf);
struct mt76_usb *usb = &dev->usb;
- unsigned int pipe;
- int ret, sent;
+ int ret;
u8 seq = 0;
u32 info;
if (test_bit(MT76_REMOVED, &dev->state))
return 0;
- pipe = usb_sndbulkpipe(udev, usb->out_ep[MT_EP_OUT_INBAND_CMD]);
if (wait_resp) {
seq = ++usb->mcu.msg_seq & 0xf;
if (!seq)
@@ -146,7 +142,7 @@ __mt76x02u_mcu_send_msg(struct mt76_dev *dev, struct
sk_buff *skb,
if (ret)
return ret;
- ret = usb_bulk_msg(udev, pipe, skb->data, skb->len, &sent, 500);
+ ret = mt76u_bulk_msg(dev, skb->data, skb->len, 500);
if (ret)
return ret;
@@ -268,14 +264,12 @@ void mt76x02u_mcu_fw_reset(struct mt76x02_dev *dev)
EXPORT_SYMBOL_GPL(mt76x02u_mcu_fw_reset);
static int
-__mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev, struct mt76u_buf *buf,
+__mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev, u8 *data,
const void *fw_data, int len, u32 dst_addr)
{
- u8 *data = sg_virt(&buf->urb->sg[0]);
- DECLARE_COMPLETION_ONSTACK(cmpl);
__le32 info;
u32 val;
- int err;
+ int err, data_len;
info = cpu_to_le32(FIELD_PREP(MT_MCU_MSG_PORT, CPU_TX_PORT) |
FIELD_PREP(MT_MCU_MSG_LEN, len) |
@@ -291,25 +285,12 @@ __mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev,
struct mt76u_buf *buf,
mt76u_single_wr(&dev->mt76, MT_VEND_WRITE_FCE,
MT_FCE_DMA_LEN, len << 16);
- buf->len = MT_CMD_HDR_LEN + len + sizeof(info);
- err = mt76u_submit_buf(&dev->mt76, USB_DIR_OUT,
- MT_EP_OUT_INBAND_CMD,
- buf, GFP_KERNEL,
- mt76u_mcu_complete_urb, &cmpl);
- if (err < 0)
- return err;
-
- if (!wait_for_completion_timeout(&cmpl,
- msecs_to_jiffies(1000))) {
- dev_err(dev->mt76.dev, "firmware upload timed out\n");
- usb_kill_urb(buf->urb);
- return -ETIMEDOUT;
- }
+ data_len = MT_CMD_HDR_LEN + len + sizeof(info);
- if (mt76u_urb_error(buf->urb)) {
- dev_err(dev->mt76.dev, "firmware upload failed: %d\n",
- buf->urb->status);
- return buf->urb->status;
+ err = mt76u_bulk_msg(&dev->mt76, data, data_len, 1000);
+ if (err) {
+ dev_err(dev->mt76.dev, "firmware upload failed: %d\n", err);
+ return err;
}
val = mt76_rr(dev, MT_TX_CPU_FROM_FCE_CPU_DESC_IDX);
@@ -322,17 +303,16 @@ __mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev,
struct mt76u_buf *buf,
int mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev, const void *data,
int data_len, u32 max_payload, u32 offset)
{
- int err, len, pos = 0, max_len = max_payload - 8;
- struct mt76u_buf buf;
+ int len, err = 0, pos = 0, max_len = max_payload - 8;
+ u8 *buf;
- err = mt76u_buf_alloc(&dev->mt76, &buf, 1, max_payload, max_payload,
- GFP_KERNEL);
- if (err < 0)
- return err;
+ buf = kmalloc(max_payload, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
while (data_len > 0) {
len = min_t(int, data_len, max_len);
- err = __mt76x02u_mcu_fw_send_data(dev, &buf, data + pos,
+ err = __mt76x02u_mcu_fw_send_data(dev, buf, data + pos,
len, offset + pos);
if (err < 0)
break;
@@ -341,7 +321,7 @@ int mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev,
const void *data,
pos += len;
usleep_range(5000, 10000);
}
- mt76u_buf_free(&buf);
+ kfree(buf);
return err;
}
diff --git a/drivers/net/wireless/mediatek/mt76/usb.c
b/drivers/net/wireless/mediatek/mt76/usb.c
index 4f92732506cc..db31cae11911 100644
--- a/drivers/net/wireless/mediatek/mt76/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/usb.c
@@ -327,7 +327,6 @@ int mt76u_buf_alloc(struct mt76_dev *dev, struct mt76u_buf
*buf,
return mt76u_fill_rx_sg(dev, buf, nsgs, len, sglen);
}
-EXPORT_SYMBOL_GPL(mt76u_buf_alloc);
void mt76u_buf_free(struct mt76u_buf *buf)
{
--
2.7.5
>From 675fdc945c2d1fce01c72f520e82289ba5877ba2 Mon Sep 17 00:00:00 2001
From: Stanislaw Gruszka <sgrus...@redhat.com>
Date: Thu, 14 Feb 2019 19:48:05 +0100
Subject: [PATCH v5 3/3] mt76usb: do not use compound head page for SG I/O
We use head of compound page as base for SG, that results in sg->offset
bigger than PAGE_SIZE pointing to another page. Some DMA controllers
work ok with that, but for dma_map_sg() and dma_map_page() we should
provide buffer contained in single page (eventually with sg->offset = 0
and sg->length of more pages, but not with sg->offset pointed to
different page than sg->page).
Signed-off-by: Stanislaw Gruszka <sgrus...@redhat.com>
---
drivers/net/wireless/mediatek/mt76/usb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mediatek/mt76/usb.c
b/drivers/net/wireless/mediatek/mt76/usb.c
index db31cae11911..de906f07e85a 100644
--- a/drivers/net/wireless/mediatek/mt76/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/usb.c
@@ -288,7 +288,7 @@ mt76u_fill_rx_sg(struct mt76_dev *dev, struct mt76u_buf
*buf,
if (!data)
break;
- page = virt_to_head_page(data);
+ page = virt_to_page(data);
offset = data - page_address(page);
sg_set_page(&urb->sg[i], page, sglen, offset);
}
--
2.7.5
