From: Peter Chen <peter.chen@nxp.com>
To: Pawel Laszczak <pawell@cadence.com>,
Felipe Balbi <felipe.balbi@linux.intel.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Cc: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"hdegoede@redhat.com" <hdegoede@redhat.com>,
"heikki.krogerus@linux.intel.com"
<heikki.krogerus@linux.intel.com>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"rogerq@ti.com" <rogerq@ti.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"jbergsagel@ti.com" <jbergsagel@ti.com>,
"nsekhar@ti.com" <nsekhar@ti.com>, "nm@ti.com" <nm@ti.com>,
Suresh Punnoose <sureshp@cadence.com>,
Jayshri Dajiram Pawar <jpawar@cadence.com>,
Rahul Kumar <kurahul@cadence.com>
Subject: RE: [PATCH v9 5/6] usb:cdns3 Add Cadence USB3 DRD Driver
Date: Mon, 12 Aug 2019 01:55:35 +0000 [thread overview]
Message-ID: <VI1PR04MB53279117788B7D7CC3080B398BD30@VI1PR04MB5327.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <BYAPR07MB4709B0A4FADFB76183D651DCDDD10@BYAPR07MB4709.namprd07.prod.outlook.com>
>
> Yes, driver frees not used buffers here.
> I think that it's the safest place for this purpose.
>
> >
> >>>> + dma_free_coherent(priv_dev->sysdev, buf-
> >size,
> >>>> + buf->buf,
> >>>> + buf->dma);
> >>>> + spin_lock_irqsave(&priv_dev->lock, flags);
> >>>> +
> >>>> + kfree(buf);
> >>>
> >>>why do you even need this "garbage collector"?
> >>
> >> I need to free not used memory. The once allocated buffer will be
> >> associated with request, but if request.length will be increased in
> >> usb_request then driver will must allocate the bigger buffer. As I
> >> remember I couldn't call dma_free_coherent in interrupt context so I
> >> had to move it to thread handled. This flag was used to avoid going through
> whole aligned_buf_list every time.
> >> In most cases this part will never called int this place
> >
> >Did you try, btw, setting the quirk flag which tells gadget drivers to
> >always allocate buffers aligned to MaxPacketSize? Wouldn't that be enough?
>
> If found only quirk_ep_out_aligned_size flag, but it align only buffer size.
>
> DMA used by this controller must have buffer address aligned to 8.
> I think that on most architecture kmalloc should guarantee such aligned.
> The problem was detected on NXP testing board.
> On my board all buffer address are alignment at least to 8.
>
This un-aligned request buffer address for 8 occurs for Ethernet Gadget (eg, NCM),
it allocates socket buffer with NET_IP_ALIGN, so the last byte of buffer address
is always 2. Although this can be workaround by setting quirk_avoids_skb_reserve,
but we are not sure if all gadget request buffers can be 8 or Max Packet Size aligned.
Peter
next prev parent reply other threads:[~2019-08-12 1:55 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-05 10:57 [PATCH v9 0/6] Introduced new Cadence USBSS DRD Driver Pawel Laszczak
2019-07-05 10:57 ` [PATCH v9 1/6] dt-bindings: add binding for USBSS-DRD controller Pawel Laszczak
2019-07-05 10:57 ` [PATCH v9 2/6] usb:gadget Separated decoding functions from dwc3 driver Pawel Laszczak
2019-07-05 11:27 ` Greg KH
2019-07-05 11:39 ` Pawel Laszczak
2019-07-05 11:49 ` Greg KH
2019-07-05 12:03 ` Pawel Laszczak
2019-07-05 11:39 ` Felipe Balbi
2019-07-05 11:44 ` Pawel Laszczak
2019-08-07 10:17 ` Roger Quadros
2019-08-07 10:22 ` Felipe Balbi
2019-08-08 3:07 ` Pawel Laszczak
2019-07-05 10:57 ` [PATCH v9 3/6] usb:gadget Patch simplify usb_decode_set_clear_feature function Pawel Laszczak
2019-07-05 10:57 ` [PATCH v9 4/6] usb:gadget Simplify usb_decode_get_set_descriptor function Pawel Laszczak
2019-07-05 10:57 ` [PATCH v9 5/6] usb:cdns3 Add Cadence USB3 DRD Driver Pawel Laszczak
2019-07-05 11:55 ` Felipe Balbi
2019-07-07 17:56 ` Pawel Laszczak
2019-07-08 6:29 ` Felipe Balbi
2019-07-08 10:59 ` Pawel Laszczak
2019-07-08 11:15 ` Felipe Balbi
2019-07-08 11:45 ` Pawel Laszczak
2019-07-08 11:59 ` Felipe Balbi
2019-07-08 12:39 ` Pawel Laszczak
2019-07-09 4:23 ` Pawel Laszczak
2019-07-09 6:36 ` Felipe Balbi
2019-07-09 7:07 ` Pawel Laszczak
2019-07-09 7:22 ` Felipe Balbi
2019-07-09 7:29 ` Pawel Laszczak
2019-07-10 8:25 ` Pawel Laszczak
2019-07-08 7:11 ` Felipe Balbi
2019-07-15 11:00 ` Pawel Laszczak
2019-08-07 10:34 ` Felipe Balbi
2019-08-10 20:39 ` Pawel Laszczak
2019-08-12 1:55 ` Peter Chen [this message]
2019-08-12 4:43 ` Pawel Laszczak
2019-08-12 5:24 ` Felipe Balbi
2019-08-12 7:13 ` Pawel Laszczak
2019-08-12 8:19 ` Felipe Balbi
2019-08-12 9:13 ` Pawel Laszczak
2019-08-12 9:45 ` Felipe Balbi
2019-08-12 10:26 ` Pawel Laszczak
2019-08-12 10:34 ` Felipe Balbi
2019-08-12 14:20 ` Alan Stern
2019-07-05 10:57 ` [PATCH v9 6/6] usb:cdns3 Fix for stuck packets in on-chip OUT buffer Pawel Laszczak
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