[Intel-gfx] [PATCH v4 3/3] drm/i915: No TLB invalidation on wedged or suspended GT
Jani Nikula
jani.nikula at linux.intel.com
Wed Oct 4 10:19:56 UTC 2023
On Tue, 03 Oct 2023, Jonathan Cavitt <jonathan.cavitt at intel.com> wrote:
> In case of GT is suspended or wedged, don't allow submission of new TLB
> invalidation request and cancel all pending requests. The TLB entries
> will be invalidated either during GuC reload or on system resume.
>
> Signed-off-by: Fei Yang <fei.yang at intel.com>
> Signed-off-by: Jonathan Cavitt <jonathan.cavitt at intel.com>
> CC: John Harrison <john.c.harrison at intel.com>
> ---
> drivers/gpu/drm/i915/gt/intel_gt.h | 26 ++++++++++++
> drivers/gpu/drm/i915/gt/uc/intel_guc.h | 1 +
> .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 41 +++++++++++++++----
> drivers/gpu/drm/i915/i915_driver.c | 5 +++
> 4 files changed, 64 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
> index 970bedf6b78a7..71a0e376ded40 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.h
> @@ -9,6 +9,7 @@
> #include "intel_engine_types.h"
> #include "intel_gt_types.h"
> #include "intel_reset.h"
> +#include "i915_drv.h"
Do not include headers from headers, especially do not include
i915_drv.h from headers.
I thought I just explained this in a previous thread.
>
> struct drm_i915_private;
> struct drm_printer;
> @@ -179,4 +180,29 @@ enum i915_map_type intel_gt_coherent_map_type(struct intel_gt *gt,
> void intel_gt_bind_context_set_ready(struct intel_gt *gt);
> void intel_gt_bind_context_set_unready(struct intel_gt *gt);
> bool intel_gt_is_bind_context_ready(struct intel_gt *gt);
> +
> +static inline void intel_tlb_suspend(struct drm_i915_private *i915)
> +{
> + struct intel_gt *gt;
> + int i;
> +
> + if (!HAS_GUC_TLB_INVALIDATION(i915))
> + return;
> + for_each_gt(gt, i915, i)
> + wake_up_all_tlb_invalidate(>->uc.guc);
> +}
> +
> +static inline void intel_tlb_resume(struct drm_i915_private *i915)
> +{
> + struct intel_gt *gt;
> + int i;
> +
> + if (!HAS_GUC_TLB_INVALIDATION(i915))
> + return;
> + for_each_gt(gt, i915, i) {
> + intel_guc_invalidate_tlb_full(>->uc.guc);
> + intel_guc_invalidate_tlb(>->uc.guc);
> + }
> +}
Do not add static inlines that require you to pull in other headers, at
least not without justification. I don't think this one could be
justified.
I thought I just explained this in a prevous thread.
I honestly don't know what you think you'll achieve by using static
inlines here, but *always* err on the side of making them proper
functions instead.
Side note on naming, functions beginning with intel_tlb_ prefix belong
in intel_tlb.[ch]. If these don't belong there, then the prefix is
wrong.
BR,
Jani.
> +
> #endif /* __INTEL_GT_H__ */
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> index 636edf598946c..e2491f489f1bc 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> @@ -536,4 +536,5 @@ void intel_guc_dump_time_info(struct intel_guc *guc, struct drm_printer *p);
>
> int intel_guc_sched_disable_gucid_threshold_max(struct intel_guc *guc);
>
> +void wake_up_all_tlb_invalidate(struct intel_guc *guc);
> #endif
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> index 872014a801c7e..20e9076cf099e 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> @@ -32,6 +32,7 @@
>
> #include "i915_drv.h"
> #include "i915_reg.h"
> +#include "i915_irq.h"
> #include "i915_trace.h"
>
> /**
> @@ -1796,13 +1797,23 @@ static void __guc_reset_context(struct intel_context *ce, intel_engine_mask_t st
> intel_context_put(parent);
> }
>
> -void intel_guc_submission_reset(struct intel_guc *guc, intel_engine_mask_t stalled)
> +void wake_up_all_tlb_invalidate(struct intel_guc *guc)
> {
> struct intel_guc_tlb_wait *wait;
> + unsigned long i;
> +
> + xa_for_each(&guc->tlb_lookup, i, wait) {
> + /* Barrier to ensure the store is observed by the woken thread */
> + smp_store_mb(wait->busy, 0);
> + wake_up(&wait->wq);
> + }
> +}
> +
> +void intel_guc_submission_reset(struct intel_guc *guc, intel_engine_mask_t stalled)
> +{
> struct intel_context *ce;
> unsigned long index;
> unsigned long flags;
> - unsigned long i;
>
> if (unlikely(!guc_submission_initialized(guc))) {
> /* Reset called during driver load? GuC not yet initialised! */
> @@ -1833,11 +1844,7 @@ void intel_guc_submission_reset(struct intel_guc *guc, intel_engine_mask_t stall
> * The full GT reset will have cleared the TLB caches and flushed the
> * G2H message queue; we can release all the blocked waiters.
> */
> - xa_for_each(&guc->tlb_lookup, i, wait) {
> - /* Barrier to ensure the store is observed by the woken thread */
> - smp_store_mb(wait->busy, 0);
> - wake_up(&wait->wq);
> - }
> + wake_up_all_tlb_invalidate(guc);
> }
>
> static void guc_cancel_context_requests(struct intel_context *ce)
> @@ -1933,6 +1940,12 @@ void intel_guc_submission_cancel_requests(struct intel_guc *guc)
>
> /* GuC is blown away, drop all references to contexts */
> xa_destroy(&guc->context_lookup);
> +
> + /*
> + * Wedged GT won't respond to any TLB invalidation request. Simply
> + * release all the blocked waiters.
> + */
> + wake_up_all_tlb_invalidate(guc);
> }
>
> void intel_guc_submission_reset_finish(struct intel_guc *guc)
> @@ -4740,6 +4753,14 @@ static long must_wait_woken(struct wait_queue_entry *wq_entry, long timeout)
> return timeout;
> }
>
> +static bool intel_gt_is_enabled(const struct intel_gt *gt)
> +{
> + /* Check if GT is wedged or suspended */
> + if (intel_gt_is_wedged(gt) || !intel_irqs_enabled(gt->i915))
> + return false;
> + return true;
> +}
> +
> static int guc_send_invalidate_tlb(struct intel_guc *guc, u32 type)
> {
> struct intel_guc_tlb_wait _wq, *wq = &_wq;
> @@ -4757,7 +4778,8 @@ static int guc_send_invalidate_tlb(struct intel_guc *guc, u32 type)
> };
> u32 size = ARRAY_SIZE(action);
>
> - if (!intel_guc_ct_enabled(&guc->ct))
> + if (!intel_gt_is_enabled(gt) ||
> + !intel_guc_ct_enabled(&guc->ct))
> return -EINVAL;
>
> init_waitqueue_head(&_wq.wq);
> @@ -4800,7 +4822,8 @@ static int guc_send_invalidate_tlb(struct intel_guc *guc, u32 type)
> * requests that can be queued in CT buffer.
> */
> #define OUTSTANDING_GUC_TIMEOUT_PERIOD (HZ * 2)
> - if (!must_wait_woken(&wait, OUTSTANDING_GUC_TIMEOUT_PERIOD)) {
> + if (intel_gt_is_enabled(gt) &&
> + !must_wait_woken(&wait, OUTSTANDING_GUC_TIMEOUT_PERIOD)) {
> gt_err(gt,
> "TLB invalidation response timed out for seqno %u\n", seqno);
> err = -ETIME;
> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
> index 78501a83ba109..66bd765d00302 100644
> --- a/drivers/gpu/drm/i915/i915_driver.c
> +++ b/drivers/gpu/drm/i915/i915_driver.c
> @@ -1092,6 +1092,9 @@ static int i915_drm_suspend(struct drm_device *dev)
> intel_dp_mst_suspend(dev_priv);
>
> intel_runtime_pm_disable_interrupts(dev_priv);
> +
> + intel_tlb_suspend(dev_priv);
> +
> intel_hpd_cancel_work(dev_priv);
>
> intel_suspend_encoders(dev_priv);
> @@ -1263,6 +1266,8 @@ static int i915_drm_resume(struct drm_device *dev)
>
> intel_gvt_resume(dev_priv);
>
> + intel_tlb_resume(dev_priv);
> +
> enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
>
> return 0;
--
Jani Nikula, Intel
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