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At the > same time it dropped the g2h_len and num_g2h arguments, which had no > in-tree users, and hardcoded a zero G2H reservation. > > That leaves no way to send an H2G that expects a G2H reply while > already holding ct->lock. The G2H receive path (parse_g2h_event() and > g2h_fast_path()) releases credit unconditionally for replies such as > DEREGISTER_CONTEXT_DONE, SCHED_CONTEXT_MODE_DONE and > TLB_INVALIDATION_DONE. If the credit was never reserved, > __g2h_release_space() reports an "Invalid G2H release" and marks the CT > dead with CT_DEAD_G2H_RELEASE. > > Replacing two u32 arguments with a bool also means a caller written > against the old signature can silently change meaning when the two > reservation arguments get merged into one: the call still compiles, > still sends the H2G, and loses only the reservation. > > Add g2h_len and num_g2h back, ahead of defer_flush, so that the > function matches xe_guc_ct_send() and forwards both values to > guc_ct_send_locked(). The kernel-doc now says when a reservation is > required and that a non-zero reservation must not be made from a G2H > handler, because waiting for credit can dequeue G2H inline. > > The only existing caller, the pagefault ack path, does not expect a > reply. It passes 0, 0 and behaves exactly as before. > > Cc: Matthew Brost Reviewed-by: Matthew Brost > Signed-off-by: Sujaritha Sundaresan > --- > drivers/gpu/drm/xe/xe_guc_ct.c | 17 +++++++++++++++-- > drivers/gpu/drm/xe/xe_guc_ct.h | 2 +- > drivers/gpu/drm/xe/xe_guc_pagefault.c | 3 ++- > 3 files changed, 18 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c > index 5c393aa29de3..da5ce97484b8 100644 > --- a/drivers/gpu/drm/xe/xe_guc_ct.c > +++ b/drivers/gpu/drm/xe/xe_guc_ct.c > @@ -1290,11 +1290,23 @@ int xe_guc_ct_send(struct xe_guc_ct *ct, const u32 *action, u32 len, > * @ct: GuC CT object > * @action: payload dwords (HxG header dword is expected at @action[-1]) > * @len: number of payload dwords in @action > + * @g2h_len: G2H response space to reserve in dwords, or 0 > + * @num_g2h: number of G2H messages expected, or 0 > * @defer_flush: defer publishing/doorbell for batching > * > * Sends a single H2G message to the GuC CT buffer while the caller already > * holds @ct->lock. > * > + * Callers that expect the GuC to reply with a G2H message must reserve the > + * matching credit via @g2h_len / @num_g2h. The G2H receive path releases that > + * credit unconditionally when the reply arrives, so failing to reserve it here > + * corrupts the G2H accounting and kills the CT channel. > + * > + * Reserving G2H credit may wait for, and process, outstanding G2H messages, so > + * this must not be called with a non-zero @g2h_len from a G2H handler. Handlers > + * should use xe_guc_ct_send_g2h_handler(), with any reply credit reserved up > + * front by the H2G that triggered the handler. > + * > * If @defer_flush is false, the function completes the submission immediately: > * it makes the payload visible to the device, updates the H2G descriptor and > * rings the GuC doorbell. > @@ -1312,11 +1324,12 @@ int xe_guc_ct_send(struct xe_guc_ct *ct, const u32 *action, u32 len, > * Must be called with @ct->lock held. > */ > int xe_guc_ct_send_locked(struct xe_guc_ct *ct, const u32 *action, u32 len, > - bool defer_flush) > + u32 g2h_len, u32 num_g2h, bool defer_flush) > { > int ret; > > - ret = guc_ct_send_locked(ct, action, len, 0, 0, NULL, defer_flush); > + ret = guc_ct_send_locked(ct, action, len, g2h_len, num_g2h, NULL, > + defer_flush); > if (ret == -EDEADLK) > kick_reset(ct); > > diff --git a/drivers/gpu/drm/xe/xe_guc_ct.h b/drivers/gpu/drm/xe/xe_guc_ct.h > index 3ddc665ab84a..e2a33249d65d 100644 > --- a/drivers/gpu/drm/xe/xe_guc_ct.h > +++ b/drivers/gpu/drm/xe/xe_guc_ct.h > @@ -56,7 +56,7 @@ static inline void xe_guc_ct_irq_handler(struct xe_guc_ct *ct) > int xe_guc_ct_send(struct xe_guc_ct *ct, const u32 *action, u32 len, > u32 g2h_len, u32 num_g2h); > int xe_guc_ct_send_locked(struct xe_guc_ct *ct, const u32 *action, u32 len, > - bool defer_flush); > + u32 g2h_len, u32 num_g2h, bool defer_flush); > int xe_guc_ct_send_recv(struct xe_guc_ct *ct, const u32 *action, u32 len, > u32 *response_buffer); > static inline int > diff --git a/drivers/gpu/drm/xe/xe_guc_pagefault.c b/drivers/gpu/drm/xe/xe_guc_pagefault.c > index df237fd40551..6b48550e7579 100644 > --- a/drivers/gpu/drm/xe/xe_guc_pagefault.c > +++ b/drivers/gpu/drm/xe/xe_guc_pagefault.c > @@ -55,7 +55,8 @@ static void guc_ack_fault(struct xe_pagefault *pf, int err) > bool write_only = guc->pagefault_ack_counter++ & > (XE_GUC_PAGEFAULT_FLUSH_PERIOD - 1); > > - xe_guc_ct_send_locked(&guc->ct, action, ARRAY_SIZE(action), > + /* Pagefault acks are fire-and-forget, no G2H reply expected. */ > + xe_guc_ct_send_locked(&guc->ct, action, ARRAY_SIZE(action), 0, 0, > write_only); > } > > -- > 2.34.1 >