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MID_RHS_MATCH_FROM(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCPT_COUNT_SEVEN(0.00)[10]; DKIM_TRACE(0.00)[suse.de:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.com:url,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,kylinos.cn:email] X-Spam-Score: -13.50 Hi Am 28.10.26 um 07:13 schrieb oushixiong1025@163.com: > From: Shixiong Ou > > A stalled device never returns its URBs, so every allocation waited > out the full timeout and stalled the display stack on each operation. > Flag the stall and fail fast until an URB comes back; give damage a > short timeout and keep the long one for modeset. I'm not comfortable with merging this change. It's nigh impossible to test.  It could also break a working set up if there's some temporary contention on the USB. Best regards Thomas > > Signed-off-by: Shixiong Ou > --- > drivers/gpu/drm/udl/udl_drv.h | 14 +++++++++++++- > drivers/gpu/drm/udl/udl_main.c | 30 +++++++++++++++++++++++++----- > drivers/gpu/drm/udl/udl_modeset.c | 6 +++--- > drivers/gpu/drm/udl/udl_transfer.c | 2 +- > 4 files changed, 42 insertions(+), 10 deletions(-) > > diff --git a/drivers/gpu/drm/udl/udl_drv.h b/drivers/gpu/drm/udl/udl_drv.h > index 145bb95ccc48..43cff97e12f7 100644 > --- a/drivers/gpu/drm/udl/udl_drv.h > +++ b/drivers/gpu/drm/udl/udl_drv.h > @@ -11,6 +11,7 @@ > #ifndef UDL_DRV_H > #define UDL_DRV_H > > +#include > #include > #include > > @@ -46,6 +47,7 @@ struct urb_list { > int available; > int count; > size_t size; > + bool wedged; > }; > > struct udl_device { > @@ -72,7 +74,17 @@ static inline struct usb_device *udl_to_usb_device(struct udl_device *udl) > int udl_modeset_init(struct udl_device *udl); > struct drm_connector *udl_connector_init(struct drm_device *dev); > > -struct urb *udl_get_urb(struct udl_device *udl); > +/* > + * How long to wait for a free URB before giving up. The damage path runs > + * on every atomic update, so keep its timeout short: a stalled device never > + * returns its URBs and the wait would otherwise stall the whole display > + * stack on every operation. Modeset is low-frequency and worth waiting > + * longer for. Once the pool is flagged wedged, neither path blocks at all. > + */ > +#define UDL_GET_URB_TIMEOUT_DAMAGE msecs_to_jiffies(100) > +#define UDL_GET_URB_TIMEOUT_MODESET msecs_to_jiffies(2000) > + > +struct urb *udl_get_urb(struct udl_device *udl, long timeout); > > int udl_submit_urb(struct udl_device *udl, struct urb *urb, size_t len); > void udl_sync_pending_urbs(struct udl_device *udl); > diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c > index 17950fe3a0ec..b92cd5300030 100644 > --- a/drivers/gpu/drm/udl/udl_main.c > +++ b/drivers/gpu/drm/udl/udl_main.c > @@ -169,6 +169,7 @@ void udl_urb_completion(struct urb *urb) > spin_lock_irqsave(&udl->urbs.lock, flags); > list_add_tail(&unode->entry, &udl->urbs.list); > udl->urbs.available++; > + udl->urbs.wedged = false; > spin_unlock_irqrestore(&udl->urbs.lock, flags); > > wake_up(&udl->urbs.sleep); > @@ -213,6 +214,7 @@ static int udl_alloc_urb_list(struct udl_device *udl, int count, size_t size) > init_waitqueue_head(&udl->urbs.sleep); > udl->urbs.count = 0; > udl->urbs.available = 0; > + udl->urbs.wedged = false; > > retry: > udl->urbs.size = size; > @@ -265,16 +267,34 @@ static struct urb *udl_get_urb_locked(struct udl_device *udl, long timeout) > > assert_spin_locked(&udl->urbs.lock); > > + /* A device that stopped completing transfers will never wake us up: > + * fail fast instead of stalling callers for the full timeout on every > + * call. Allocations for teardown (MAX_SCHEDULE_TIMEOUT) still wait, > + * since the USB core returns all URBs on disconnect. > + */ > + if (udl->urbs.wedged && timeout != MAX_SCHEDULE_TIMEOUT) { > + if (list_empty(&udl->urbs.list)) > + return NULL; > + goto take; > + } > + > /* Wait for an in-flight buffer to complete and get re-queued */ > if (!wait_event_lock_irq_timeout(udl->urbs.sleep, > !udl->urbs.count || > !list_empty(&udl->urbs.list), > udl->urbs.lock, timeout)) { > - DRM_INFO("wait for urb interrupted: available: %d\n", > - udl->urbs.available); > + if (timeout == MAX_SCHEDULE_TIMEOUT) { > + DRM_INFO("wait for urb interrupted: available: %d\n", > + udl->urbs.available); > + } else { > + udl->urbs.wedged = true; > + drm_warn_ratelimited(&udl->drm, > + "no URB returned within %u ms (available %d); device stalled, dropping frames\n", > + jiffies_to_msecs(timeout), udl->urbs.available); > + } > return NULL; > } > - > +take: > if (!udl->urbs.count) > return NULL; > > @@ -285,12 +305,12 @@ static struct urb *udl_get_urb_locked(struct udl_device *udl, long timeout) > return unode->urb; > } > > -struct urb *udl_get_urb(struct udl_device *udl) > +struct urb *udl_get_urb(struct udl_device *udl, long timeout) > { > struct urb *urb; > > spin_lock_irq(&udl->urbs.lock); > - urb = udl_get_urb_locked(udl, HZ * 2); > + urb = udl_get_urb_locked(udl, timeout); > spin_unlock_irq(&udl->urbs.lock); > return urb; > } > diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c > index 289711035b67..c907846048f8 100644 > --- a/drivers/gpu/drm/udl/udl_modeset.c > +++ b/drivers/gpu/drm/udl/udl_modeset.c > @@ -218,7 +218,7 @@ static int udl_handle_damage(struct drm_framebuffer *fb, > return ret; > log_bpp = ret; > > - urb = udl_get_urb(udl); > + urb = udl_get_urb(udl, UDL_GET_URB_TIMEOUT_DAMAGE); > if (!urb) > return -ENOMEM; > cmd = urb->transfer_buffer; > @@ -342,7 +342,7 @@ static void udl_crtc_helper_atomic_enable(struct drm_crtc *crtc, struct drm_atom > if (!drm_dev_enter(dev, &idx)) > return; > > - urb = udl_get_urb(udl); > + urb = udl_get_urb(udl, UDL_GET_URB_TIMEOUT_MODESET); > if (!urb) { > drm_err_ratelimited(dev, "get urb failed when enabling crtc\n"); > goto out; > @@ -377,7 +377,7 @@ static void udl_crtc_helper_atomic_disable(struct drm_crtc *crtc, struct drm_ato > if (!drm_dev_enter(dev, &idx)) > return; > > - urb = udl_get_urb(udl); > + urb = udl_get_urb(udl, UDL_GET_URB_TIMEOUT_MODESET); > if (!urb) > goto out; > > diff --git a/drivers/gpu/drm/udl/udl_transfer.c b/drivers/gpu/drm/udl/udl_transfer.c > index 7d670b3a5293..bfff17bba58d 100644 > --- a/drivers/gpu/drm/udl/udl_transfer.c > +++ b/drivers/gpu/drm/udl/udl_transfer.c > @@ -202,7 +202,7 @@ int udl_render_hline(struct udl_device *udl, int log_bpp, struct urb **urb_ptr, > int ret = udl_submit_urb(udl, urb, len); > if (ret) > return ret; > - urb = udl_get_urb(udl); > + urb = udl_get_urb(udl, UDL_GET_URB_TIMEOUT_DAMAGE); > if (!urb) > return -EAGAIN; > *urb_ptr = urb; -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Stefan Gaiser, Jochen Jaser, Abhinav Puri, (HRB 36809, AG Nürnberg)