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Message-ID: <CAATdQgCkLxU2ts_dUq5+MnaxQ6RD69zddVKxqPRRZAGG2iq2hA@mail.gmail.com>
Date: Mon, 1 Feb 2021 17:20:30 +0800
From: Ikjoon Jang <ikjn@...omium.org>
To: Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc: Mathias Nyman <mathias.nyman@...el.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Zhanyong Wang <zhanyong.wang@...iatek.com>,
linux-usb@...r.kernel.org,
open list <linux-kernel@...r.kernel.org>,
stable <stable@...r.kernel.org>,
Tianping Fang <tianping.fang@...iatek.com>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>,
Matthias Brugger <matthias.bgg@...il.com>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [next PATCH] usb: xhci-mtk: skip dropping bandwidth of unchecked endpoints
HI Chunfeng,
On Mon, Feb 1, 2021 at 1:58 PM Chunfeng Yun <chunfeng.yun@...iatek.com> wrote:
>
> For those unchecked endpoints, we don't allocate bandwidth for
> them, so no need free the bandwidth, otherwise will decrease
> the allocated bandwidth.
> Meanwhile use xhci_dbg() instead of dev_dbg() to print logs and
> rename bw_ep_list_new as bw_ep_chk_list.
>
> Fixes: 1d69f9d901ef ("usb: xhci-mtk: fix unreleased bandwidth data")
> Cc: stable <stable@...r.kernel.org>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
Reviewed-and-tested-by: Ikjoon Jang <ikjn@...omium.org>
> ---
> drivers/usb/host/xhci-mtk-sch.c | 61 ++++++++++++++++++---------------
> drivers/usb/host/xhci-mtk.h | 4 ++-
> 2 files changed, 36 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
> index a313e75ff1c6..dee8a329076d 100644
> --- a/drivers/usb/host/xhci-mtk-sch.c
> +++ b/drivers/usb/host/xhci-mtk-sch.c
> @@ -200,6 +200,7 @@ static struct mu3h_sch_ep_info *create_sch_ep(struct usb_device *udev,
>
> sch_ep->sch_tt = tt;
> sch_ep->ep = ep;
> + INIT_LIST_HEAD(&sch_ep->endpoint);
> INIT_LIST_HEAD(&sch_ep->tt_endpoint);
>
> return sch_ep;
> @@ -374,6 +375,7 @@ static void update_bus_bw(struct mu3h_sch_bw_info *sch_bw,
> sch_ep->bw_budget_table[j];
> }
> }
> + sch_ep->allocated = used;
Yes, this is really needed!
> }
>
> static int check_sch_tt(struct usb_device *udev,
> @@ -542,6 +544,22 @@ static int check_sch_bw(struct usb_device *udev,
> return 0;
> }
>
> +static void destroy_sch_ep(struct usb_device *udev,
> + struct mu3h_sch_bw_info *sch_bw, struct mu3h_sch_ep_info *sch_ep)
> +{
> + /* only release ep bw check passed by check_sch_bw() */
> + if (sch_ep->allocated)
> + update_bus_bw(sch_bw, sch_ep, 0);
So only these two lines really matter.
> +
> + list_del(&sch_ep->endpoint);
> +
> + if (sch_ep->sch_tt) {
> + list_del(&sch_ep->tt_endpoint);
> + drop_tt(udev);
> + }
> + kfree(sch_ep);
> +}
> +
> static bool need_bw_sch(struct usb_host_endpoint *ep,
> enum usb_device_speed speed, int has_tt)
> {
> @@ -584,7 +602,7 @@ int xhci_mtk_sch_init(struct xhci_hcd_mtk *mtk)
>
> mtk->sch_array = sch_array;
>
> - INIT_LIST_HEAD(&mtk->bw_ep_list_new);
> + INIT_LIST_HEAD(&mtk->bw_ep_chk_list);
>
> return 0;
> }
> @@ -636,29 +654,12 @@ int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
>
> setup_sch_info(udev, ep_ctx, sch_ep);
>
> - list_add_tail(&sch_ep->endpoint, &mtk->bw_ep_list_new);
> + list_add_tail(&sch_ep->endpoint, &mtk->bw_ep_chk_list);
>
> return 0;
> }
> EXPORT_SYMBOL_GPL(xhci_mtk_add_ep_quirk);
>
> -static void xhci_mtk_drop_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
> - struct mu3h_sch_ep_info *sch_ep)
> -{
> - struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
> - int bw_index = get_bw_index(xhci, udev, sch_ep->ep);
> - struct mu3h_sch_bw_info *sch_bw = &mtk->sch_array[bw_index];
> -
> - update_bus_bw(sch_bw, sch_ep, 0);
> - list_del(&sch_ep->endpoint);
> -
> - if (sch_ep->sch_tt) {
> - list_del(&sch_ep->tt_endpoint);
> - drop_tt(udev);
> - }
> - kfree(sch_ep);
> -}
> -
> void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
> struct usb_host_endpoint *ep)
> {
> @@ -688,9 +689,8 @@ void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
> sch_bw = &sch_array[bw_index];
>
> list_for_each_entry_safe(sch_ep, tmp, &sch_bw->bw_ep_list, endpoint) {
> - if (sch_ep->ep == ep) {
> - xhci_mtk_drop_ep(mtk, udev, sch_ep);
> - }
> + if (sch_ep->ep == ep)
> + destroy_sch_ep(udev, sch_bw, sch_ep);
not so critical but I've also missed 'break' here.
Can you please add a break statement here?
> }
> }
> EXPORT_SYMBOL_GPL(xhci_mtk_drop_ep_quirk);
> @@ -704,9 +704,9 @@ int xhci_mtk_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> struct mu3h_sch_ep_info *sch_ep, *tmp;
> int bw_index, ret;
>
> - dev_dbg(&udev->dev, "%s\n", __func__);
> + xhci_dbg(xhci, "%s() udev %s\n", __func__, dev_name(&udev->dev));
>
> - list_for_each_entry(sch_ep, &mtk->bw_ep_list_new, endpoint) {
> + list_for_each_entry(sch_ep, &mtk->bw_ep_chk_list, endpoint) {
> bw_index = get_bw_index(xhci, udev, sch_ep->ep);
> sch_bw = &mtk->sch_array[bw_index];
>
> @@ -717,7 +717,7 @@ int xhci_mtk_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> }
> }
>
> - list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_list_new, endpoint) {
> + list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_chk_list, endpoint) {
> struct xhci_ep_ctx *ep_ctx;
> struct usb_host_endpoint *ep = sch_ep->ep;
> unsigned int ep_index = xhci_get_endpoint_index(&ep->desc);
> @@ -746,12 +746,17 @@ EXPORT_SYMBOL_GPL(xhci_mtk_check_bandwidth);
> void xhci_mtk_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> {
> struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + struct mu3h_sch_bw_info *sch_bw;
> struct mu3h_sch_ep_info *sch_ep, *tmp;
> + int bw_index;
>
> - dev_dbg(&udev->dev, "%s\n", __func__);
> + xhci_dbg(xhci, "%s() udev %s\n", __func__, dev_name(&udev->dev));
>
> - list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_list_new, endpoint) {
> - xhci_mtk_drop_ep(mtk, udev, sch_ep);
> + list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_chk_list, endpoint) {
> + bw_index = get_bw_index(xhci, udev, sch_ep->ep);
> + sch_bw = &mtk->sch_array[bw_index];
> + destroy_sch_ep(udev, sch_bw, sch_ep);
> }
>
> xhci_reset_bandwidth(hcd, udev);
> diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-mtk.h
> index 577f431c5c93..cbb09dfea62e 100644
> --- a/drivers/usb/host/xhci-mtk.h
> +++ b/drivers/usb/host/xhci-mtk.h
> @@ -59,6 +59,7 @@ struct mu3h_sch_bw_info {
> * @ep_type: endpoint type
> * @maxpkt: max packet size of endpoint
> * @ep: address of usb_host_endpoint struct
> + * @allocated: the bandwidth is aready allocated from bus_bw
> * @offset: which uframe of the interval that transfer should be
> * scheduled first time within the interval
> * @repeat: the time gap between two uframes that transfers are
> @@ -86,6 +87,7 @@ struct mu3h_sch_ep_info {
> u32 ep_type;
> u32 maxpkt;
> void *ep;
> + bool allocated;
> /*
> * mtk xHCI scheduling information put into reserved DWs
> * in ep context
> @@ -130,8 +132,8 @@ struct mu3c_ippc_regs {
> struct xhci_hcd_mtk {
> struct device *dev;
> struct usb_hcd *hcd;
> - struct list_head bw_ep_list_new;
> struct mu3h_sch_bw_info *sch_array;
> + struct list_head bw_ep_chk_list;
> struct mu3c_ippc_regs __iomem *ippc_regs;
> bool has_ippc;
> int num_u2_ports;
> --
> 2.18.0
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek
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