[PATCH v6] usb: xhci-mtk: fix unreleased bandwidth data

Ikjoon Jang
2021-01-13T10:06:34Z

xhci-mtk needs XHCI_MTK_HOST quirk functions in add_endpoint() and
drop_endpoint() to handle its own sw bandwidth management.

It stores bandwidth data into an internal table every time
add_endpoint() is called, and drops those in drop_endpoint().
But when bandwidth allocation fails at one endpoint, all earlier
allocation from the same interface could still remain at the table.

This patch moves bandwidth management codes to check_bandwidth() and
reset_bandwidth() path. To do so, this patch also adds those functions
to xhci_driver_overrides and lets mtk-xhci to release all failed
endpoints in reset_bandwidth() path.

Fixes: 08e469de87a2 ("usb: xhci-mtk: supports bandwidth scheduling with multi-TT")
Signed-off-by: Ikjoon Jang <ikjn@chromium.org>

---

Changes in v6:
- use xhci overrides instead of quirk functions for
{check|reset}_bandwidth().

Changes in v5:
- Fix a wrong commit id in Fixes tag

Changes in v4:
- bugfix in v3, check_bandwidth() return uninitialized value
when no new endpoints were added.
- change Fixes tag to keep dependency

Changes in v3:
- drop unrelated code cleanups
- change Fixes tag to keep dependency

Changes in v2:
- fix a 0-day warning from unused variable
- split one big patch into three patches
- fix wrong offset in mediatek hw flags

drivers/usb/host/xhci-mtk-sch.c | 123 ++++++++++++++++++++++----------
drivers/usb/host/xhci-mtk.c | 2 +
drivers/usb/host/xhci-mtk.h | 13 ++++
drivers/usb/host/xhci.c | 8 ++-
drivers/usb/host/xhci.h | 4 ++
5 files changed, 111 insertions(+), 39 deletions(-)

diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index 45c54d56ecbd..a313e75ff1c6 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->tt_endpoint);

return sch_ep;
}
@@ -583,6 +584,8 @@ 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);
@@ -601,19 +604,14 @@ int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
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;
- struct mu3h_sch_bw_info *sch_array;
unsigned int ep_index;
- int bw_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);
ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
- sch_array = mtk->sch_array;

xhci_dbg(xhci, "%s() type:%d, speed:%d, mpkt:%d, dir:%d, ep:%p\n",
__func__, usb_endpoint_type(&ep->desc), udev->speed,
@@ -632,39 +630,34 @@ int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
return 0;
}

- bw_index = get_bw_index(xhci, udev, ep);
- sch_bw = &sch_array[bw_index];
-
sch_ep = create_sch_ep(udev, ep, ep_ctx);
if (IS_ERR_OR_NULL(sch_ep))
return -ENOMEM;

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 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];

- 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)
@@ -675,7 +668,7 @@ void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
struct xhci_virt_device *virt_dev;
struct mu3h_sch_bw_info *sch_array;
struct mu3h_sch_bw_info *sch_bw;
- struct mu3h_sch_ep_info *sch_ep;
+ struct mu3h_sch_ep_info *sch_ep, *tmp;
int bw_index;

xhci = hcd_to_xhci(hcd);
@@ -694,17 +687,73 @@ void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
bw_index = get_bw_index(xhci, udev, ep);
sch_bw = &sch_array[bw_index];

- 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);
- break;
+ xhci_mtk_drop_ep(mtk, udev, sch_ep);
}
}
}
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_bw_info *sch_bw;
+ struct mu3h_sch_ep_info *sch_ep, *tmp;
+ int bw_index, ret;
+
+ dev_dbg(&udev->dev, "%s\n", __func__);
+
+ list_for_each_entry(sch_ep, &mtk->bw_ep_list_new, endpoint) {
+ bw_index = get_bw_index(xhci, udev, sch_ep->ep);
+ sch_bw = &mtk->sch_array[bw_index];
+
+ ret = check_sch_bw(udev, sch_bw, sch_ep);
+ if (ret) {
+ xhci_err(xhci, "Not enough bandwidth!\n");
+ return -ENOSPC;
+ }
+ }
+
+ list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_list_new, 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);
+
+ bw_index = get_bw_index(xhci, udev, ep);
+ sch_bw = &mtk->sch_array[bw_index];
+
+ 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 xhci_check_bandwidth(hcd, udev);
+}
+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);
+ }
+
+ xhci_reset_bandwidth(hcd, udev);
+}
+EXPORT_SYMBOL_GPL(xhci_mtk_reset_bandwidth);
diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index ee9af03a9593..c9b7b3527642 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -359,6 +359,8 @@ static void usb_wakeup_set(struct xhci_hcd_mtk *mtk, bool enable)
static int xhci_mtk_setup(struct usb_hcd *hcd);
static const struct xhci_driver_overrides xhci_mtk_overrides __initconst = {
.reset = xhci_mtk_setup,
+ .check_bandwidth = xhci_mtk_check_bandwidth,
+ .reset_bandwidth = xhci_mtk_reset_bandwidth,
};

static struct hc_driver __read_mostly xhci_mtk_hc_driver;
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..90d7818dfc23 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -2833,7 +2833,7 @@ static void xhci_check_bw_drop_ep_streams(struct xhci_hcd *xhci,
* else should be touching the xhci->devs[slot_id] structure, so we
* don't need to take the xhci->lock for manipulating that.
*/
-static int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
+int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
{
int i;
int ret = 0;
@@ -2930,7 +2930,7 @@ static int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
return ret;
}

-static void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
+void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
{
struct xhci_hcd *xhci;
struct xhci_virt_device *virt_dev;
@@ -5348,6 +5348,10 @@ void xhci_init_driver(struct hc_driver *drv,
drv->reset = over->reset;
if (over->start)
drv->start = over->start;
+ if (over->check_bandwidth)
+ drv->check_bandwidth = over->check_bandwidth;
+ if (over->reset_bandwidth)
+ drv->reset_bandwidth = over->reset_bandwidth;
}
}
EXPORT_SYMBOL_GPL(xhci_init_driver);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 31be8625b570..7fbe6cfc9f68 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1918,6 +1918,8 @@ struct xhci_driver_overrides {
size_t extra_priv_size;
int (*reset)(struct usb_hcd *hcd);
int (*start)(struct usb_hcd *hcd);
+ int (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
+ void (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
};

#define XHCI_CFC_DELAY 10
@@ -2070,6 +2072,8 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks);
void xhci_shutdown(struct usb_hcd *hcd);
void xhci_init_driver(struct hc_driver *drv,
const struct xhci_driver_overrides *over);
+int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
+void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
int xhci_disable_slot(struct xhci_hcd *xhci, u32 slot_id);
int xhci_ext_cap_init(struct xhci_hcd *xhci);

--
2.30.0.284.gd98b1dd5eaa7-goog