[PATCH v2 3/3] usb: xhci-mtk: fix unreleased bandwidth data

Ikjoon Jang
2020-12-10T10:49:29Z

xhci-mtk has hooks on add_endpoint() and drop_endpoint() from xhci
to handle its own sw bandwidth managements and stores bandwidth data
into internal table every time add_endpoint() is called,
so when bandwidth allocation fails at one endpoint, all earlier
allocation from the same interface could still remain at the table.

This patch adds two more hooks from check_bandwidth() and
reset_bandwidth(), and make mtk-xhci to releases all failed endpoints
from reset_bandwidth().

Fixes: 0cbd4b34cda9 ("xhci: mediatek: support MTK xHCI host controller")
Signed-off-by: Ikjoon Jang <ikjn@chromium.org>

---

Changes in v2:
- fix wrong offset in mediatek hw flags
- fix 0-day warnings

drivers/usb/host/xhci-mtk-sch.c | 120 ++++++++++++++++++++++----------
drivers/usb/host/xhci-mtk.h | 13 ++++
drivers/usb/host/xhci.c | 9 +++
3 files changed, 107 insertions(+), 35 deletions(-)

diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index 439391f1dc78..102d8e0a50f1 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -583,6 +583,8 @@ int xhci_mtk_sch_init(struct xhci_hcd_mtk *mtk)

mtk->sch_array = sch_array;

+ INIT_LIST_HEAD(&mtk->bw_ep_list_new);
+
return 0;
}
EXPORT_SYMBOL_GPL(xhci_mtk_sch_init);
@@ -597,16 +599,14 @@ int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
struct usb_host_endpoint *ep)
{
struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
- struct xhci_hcd *xhci;
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct xhci_ep_ctx *ep_ctx;
struct xhci_slot_ctx *slot_ctx;
struct xhci_virt_device *virt_dev;
struct mu3h_sch_bw_info *sch_bw;
struct mu3h_sch_ep_info *sch_ep;
unsigned int ep_index;
- int ret = 0;

- xhci = hcd_to_xhci(hcd);
virt_dev = xhci->devs[udev->slot_id];
ep_index = xhci_get_endpoint_index(&ep->desc);
slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
@@ -637,42 +637,37 @@ int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,

setup_sch_info(udev, ep_ctx, sch_ep);

- ret = check_sch_bw(udev, sch_bw, sch_ep);
- if (ret) {
- xhci_err(xhci, "Not enough bandwidth!\n");
- if (is_fs_or_ls(udev->speed))
- drop_tt(udev);
-
- kfree(sch_ep);
- return -ENOSPC;
- }
+ list_add_tail(&sch_ep->endpoint, &mtk->bw_ep_list_new);

- list_add_tail(&sch_ep->endpoint, &sch_bw->bw_ep_list);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xhci_mtk_add_ep_quirk);

- ep_ctx->reserved[0] |= cpu_to_le32(EP_BPKTS(sch_ep->pkts)
- | EP_BCSCOUNT(sch_ep->cs_count) | EP_BBM(sch_ep->burst_mode));
- ep_ctx->reserved[1] |= cpu_to_le32(EP_BOFFSET(sch_ep->offset)
- | EP_BREPEAT(sch_ep->repeat));
+static void xhci_mtk_drop_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
+ struct mu3h_sch_ep_info *sch_ep)
+{
+ struct mu3h_sch_bw_info *sch_bw = get_bw_info(mtk, udev, sch_ep->ep);

- xhci_dbg(xhci, " PKTS:%x, CSCOUNT:%x, BM:%x, OFFSET:%x, REPEAT:%x\n",
- sch_ep->pkts, sch_ep->cs_count, sch_ep->burst_mode,
- sch_ep->offset, sch_ep->repeat);
+ update_bus_bw(sch_bw, sch_ep, 0);
+ list_del(&sch_ep->endpoint);

- return 0;
+ if (sch_ep->sch_tt) {
+ list_del(&sch_ep->tt_endpoint);
+ drop_tt(udev);
+ }
+ kfree(sch_ep);
}
-EXPORT_SYMBOL_GPL(xhci_mtk_add_ep_quirk);

void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
- struct usb_host_endpoint *ep)
+ struct usb_host_endpoint *ep)
{
struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
- struct xhci_hcd *xhci;
- struct xhci_slot_ctx *slot_ctx;
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct xhci_virt_device *virt_dev;
+ struct xhci_slot_ctx *slot_ctx;
struct mu3h_sch_bw_info *sch_bw;
- struct mu3h_sch_ep_info *sch_ep;
+ struct mu3h_sch_ep_info *sch_ep, *tmp;

- xhci = hcd_to_xhci(hcd);
virt_dev = xhci->devs[udev->slot_id];
slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);

@@ -686,17 +681,72 @@ void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,

sch_bw = get_bw_info(mtk, udev, ep);

- list_for_each_entry(sch_ep, &sch_bw->bw_ep_list, endpoint) {
+ list_for_each_entry_safe(sch_ep, tmp, &sch_bw->bw_ep_list, endpoint) {
if (sch_ep->ep == ep) {
- update_bus_bw(sch_bw, sch_ep, 0);
- list_del(&sch_ep->endpoint);
- if (is_fs_or_ls(udev->speed)) {
- list_del(&sch_ep->tt_endpoint);
- drop_tt(udev);
- }
- kfree(sch_ep);
+ xhci_mtk_drop_ep(mtk, udev, sch_ep);
break;
}
}
}
EXPORT_SYMBOL_GPL(xhci_mtk_drop_ep_quirk);
+
+int xhci_mtk_check_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 xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
+ struct mu3h_sch_ep_info *sch_ep, *tmp;
+
+ dev_dbg(&udev->dev, "%s\n", __func__);
+
+ list_for_each_entry(sch_ep, &mtk->bw_ep_list_new, endpoint) {
+ int ret;
+ struct mu3h_sch_bw_info *sch_bw;
+
+ sch_bw = get_bw_info(mtk, udev, sch_ep->ep);
+
+ ret = check_sch_bw(udev, sch_bw, sch_ep);
+ if (ret) {
+ xhci_err(xhci, "Not enough bandwidth!\n");
+ return ret;
+ }
+ }
+
+ list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_list_new, endpoint) {
+ struct mu3h_sch_bw_info *sch_bw;
+ struct xhci_ep_ctx *ep_ctx;
+ struct usb_host_endpoint *ep = sch_ep->ep;
+ unsigned int ep_index = xhci_get_endpoint_index(&ep->desc);
+
+ sch_bw = get_bw_info(mtk, udev, ep);
+
+ list_move_tail(&sch_ep->endpoint, &sch_bw->bw_ep_list);
+
+ ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
+ ep_ctx->reserved[0] |= cpu_to_le32(EP_BPKTS(sch_ep->pkts)
+ | EP_BCSCOUNT(sch_ep->cs_count)
+ | EP_BBM(sch_ep->burst_mode));
+ ep_ctx->reserved[1] |= cpu_to_le32(EP_BOFFSET(sch_ep->offset)
+ | EP_BREPEAT(sch_ep->repeat));
+
+ xhci_dbg(xhci, " PKTS:%x, CSCOUNT:%x, BM:%x, OFFSET:%x, REPEAT:%x\n",
+ sch_ep->pkts, sch_ep->cs_count, sch_ep->burst_mode,
+ sch_ep->offset, sch_ep->repeat);
+ }
+
+ return 0;
+}
+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 mu3h_sch_ep_info *sch_ep, *tmp;
+
+ dev_dbg(&udev->dev, "%s\n", __func__);
+
+ list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_list_new, endpoint) {
+ xhci_mtk_drop_ep(mtk, udev, sch_ep);
+ }
+}
+EXPORT_SYMBOL_GPL(xhci_mtk_reset_bandwidth);
diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-mtk.h
index 8be8c5f7ff62..05ca989985fc 100644
--- a/drivers/usb/host/xhci-mtk.h
+++ b/drivers/usb/host/xhci-mtk.h
@@ -130,6 +130,7 @@ 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 mu3c_ippc_regs __iomem *ippc_regs;
bool has_ippc;
@@ -165,6 +166,8 @@ int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
struct usb_host_endpoint *ep);
void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
struct usb_host_endpoint *ep);
+int xhci_mtk_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
+void xhci_mtk_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);

#else
static inline int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd,
@@ -178,6 +181,16 @@ static inline void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd,
{
}

+static inline int xhci_mtk_check_bandwidth(struct usb_hcd *hcd,
+ struct usb_device *udev)
+{
+ return 0;
+}
+
+static inline void xhci_mtk_reset_bandwidth(struct usb_hcd *hcd,
+ struct usb_device *udev)
+{
+}
#endif

#endif /* _XHCI_MTK_H_ */
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 2bf6c526ac7a..5a9e01b33688 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -2854,6 +2854,12 @@ static int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
virt_dev = xhci->devs[udev->slot_id];

+ if (xhci->quirks & XHCI_MTK_HOST) {
+ ret = xhci_mtk_check_bandwidth(hcd, udev);
+ if (ret < 0)
+ return ret;
+ }
+
command = xhci_alloc_command(xhci, true, GFP_KERNEL);
if (!command)
return -ENOMEM;
@@ -2941,6 +2947,9 @@ static void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
return;
xhci = hcd_to_xhci(hcd);

+ if (xhci->quirks & XHCI_MTK_HOST)
+ xhci_mtk_reset_bandwidth(hcd, udev);
+
xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
virt_dev = xhci->devs[udev->slot_id];
/* Free any rings allocated for added endpoints */
--
2.29.2.576.ga3fc446d84-goog