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Expected callers > include the GuC CT layer and the GuC submission layer. Atomically > visable as soon as vCPU are unhalted until VF recovery completes. > > Signed-off-by: Matthew Brost > --- > drivers/gpu/drm/xe/xe_gt_sriov_vf.c | 17 ++++++++ > drivers/gpu/drm/xe/xe_gt_sriov_vf.h | 2 + > drivers/gpu/drm/xe/xe_gt_sriov_vf_types.h | 10 +++++ > drivers/gpu/drm/xe/xe_memirq.c | 48 ++++++++++++++++++++++- > drivers/gpu/drm/xe/xe_memirq.h | 3 ++ > 5 files changed, 79 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c > index 016c867e5e2b..c9d0e32e7a15 100644 > --- a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c > +++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c > @@ -26,6 +26,7 @@ > #include "xe_guc_hxg_helpers.h" > #include "xe_guc_relay.h" > #include "xe_lrc.h" > +#include "xe_memirq.h" > #include "xe_mmio.h" > #include "xe_sriov.h" > #include "xe_sriov_vf.h" > @@ -828,6 +829,7 @@ void xe_gt_sriov_vf_migrated_event_handler(struct xe_gt *gt) > struct xe_device *xe = gt_to_xe(gt); > > xe_gt_assert(gt, IS_SRIOV_VF(xe)); > + xe_gt_assert(gt, xe_gt_sriov_vf_recovery_inprogress(gt)); > > set_bit(gt->info.id, &xe->sriov.vf.migration.gt_flags); > /* > @@ -1172,3 +1174,18 @@ void xe_gt_sriov_vf_print_version(struct xe_gt *gt, struct drm_printer *p) > drm_printf(p, "\thandshake:\t%u.%u\n", > pf_version->major, pf_version->minor); > } > + > +/** > + * xe_gt_sriov_vf_recovery_inprogress() - VF post migration recovery in progress > + * @gt: the &xe_gt > + * > + * Return: True if VF post migration recovery in progress, False otherwise > + */ > +bool xe_gt_sriov_vf_recovery_inprogress(struct xe_gt *gt) > +{ > + struct xe_memirq *memirq = >_to_tile(gt)->memirq; > + > + return IS_SRIOV_VF(gt_to_xe(gt)) && this is xe_gt_sriov_vf function, so it is expected to be called only by the VF code, thus we should rather use xe_gt_assert here and the caller is responsible for the IS_SRIOV_VF check > + (xe_memirq_vf_recovery_irq_pending(memirq, >->uc.guc) || > + READ_ONCE(gt->sriov.vf.migration.recovery_inprogress)); > +} > diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf.h b/drivers/gpu/drm/xe/xe_gt_sriov_vf.h > index 0af1dc769fe0..bb5f8eace19b 100644 > --- a/drivers/gpu/drm/xe/xe_gt_sriov_vf.h > +++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf.h > @@ -25,6 +25,8 @@ void xe_gt_sriov_vf_default_lrcs_hwsp_rebase(struct xe_gt *gt); > int xe_gt_sriov_vf_notify_resfix_done(struct xe_gt *gt); > void xe_gt_sriov_vf_migrated_event_handler(struct xe_gt *gt); > > +bool xe_gt_sriov_vf_recovery_inprogress(struct xe_gt *gt); > + > u32 xe_gt_sriov_vf_gmdid(struct xe_gt *gt); > u16 xe_gt_sriov_vf_guc_ids(struct xe_gt *gt); > u64 xe_gt_sriov_vf_lmem(struct xe_gt *gt); > diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf_types.h b/drivers/gpu/drm/xe/xe_gt_sriov_vf_types.h > index d95857bd789b..7b10b8e1e10e 100644 > --- a/drivers/gpu/drm/xe/xe_gt_sriov_vf_types.h > +++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf_types.h > @@ -49,6 +49,14 @@ struct xe_gt_sriov_vf_runtime { > } *regs; > }; > > +/** > + * xe_gt_sriov_vf_migration - VF migration data. > + */ > +struct xe_gt_sriov_vf_migration { > + /** @recovery_inprogress: VF post migration recovery in progress */ > + bool recovery_inprogress; > +}; > + > /** > * struct xe_gt_sriov_vf - GT level VF virtualization data. > */ > @@ -61,6 +69,8 @@ struct xe_gt_sriov_vf { > struct xe_gt_sriov_vf_selfconfig self_config; > /** @runtime: runtime data retrieved from the PF. */ > struct xe_gt_sriov_vf_runtime runtime; > + /** @migration: migration data for the VF. */ > + struct xe_gt_sriov_vf_migration migration; > }; > > #endif > diff --git a/drivers/gpu/drm/xe/xe_memirq.c b/drivers/gpu/drm/xe/xe_memirq.c > index 49c45ec3e83c..94d5d6859aab 100644 > --- a/drivers/gpu/drm/xe/xe_memirq.c > +++ b/drivers/gpu/drm/xe/xe_memirq.c > @@ -398,6 +398,23 @@ void xe_memirq_postinstall(struct xe_memirq *memirq) > memirq_set_enable(memirq, true); > } > > +static bool memirq_received_noclear(struct xe_memirq *memirq, > + struct iosys_map *vector, > + u16 offset, const char *name) maybe instead of duplicating code of memirq_received() in 90% just add there the "bool clear" flag? > +{ > + u8 value; > + > + value = iosys_map_rd(vector, offset, u8); > + if (value) { > + if (value != 0xff) > + memirq_err_ratelimited(memirq, > + "Unexpected memirq value %#x from %s at %u\n", > + value, name, offset); > + } > + > + return value; > +} > + > static bool memirq_received(struct xe_memirq *memirq, struct iosys_map *vector, > u16 offset, const char *name) > { > @@ -434,8 +451,16 @@ static void memirq_dispatch_guc(struct xe_memirq *memirq, struct iosys_map *stat > if (memirq_received(memirq, status, ilog2(GUC_INTR_GUC2HOST), name)) > xe_guc_irq_handler(guc, GUC_INTR_GUC2HOST); > > - if (memirq_received(memirq, status, ilog2(GUC_INTR_SW_INT_0), name)) > + /* > + * We must wait to perform the clear operation until after > + * xe_gt_sriov_vf_start_migration_recovery() runs, to avoid race > + * conditions where xe_gt_sriov_vf_recovery_inprogress() returns false. but the VF recovery "inprogress" shall be already set in the top level xe_sriov_vf_start_migration_recovery() even before the GT-level recovery starts, where is this race ? > + */ > + if (memirq_received_noclear(memirq, status, ilog2(GUC_INTR_SW_INT_0), > + name)) { > xe_guc_irq_handler(guc, GUC_INTR_SW_INT_0); what if new MEMIRQ will arrive just here is it ok that we will clear it immediately? the whole memirq flow is that we clear irq byte first and then process it, so if anything comes right after we finish processing will be noticed on next iteration I assume any races due to double migration shall be handled on the VF2GUC communication level while sending RESFIX_START/DONE, not here > + iosys_map_wr(status, ilog2(GUC_INTR_SW_INT_0), u8, 0x00); > + } > } > > /** > @@ -460,6 +485,27 @@ void xe_memirq_hwe_handler(struct xe_memirq *memirq, struct xe_hw_engine *hwe) > } > } > > +/** > + * xe_memirq_vf_recovery_irq_pending() - VF recovery IRQ is pending this function isn't really using anything VF specific except that on the VF the SW_INT_0 means "migrated" maybe we can drop the _vf from function name? xe_memirq_pending_guc(memirq, guc, bit) > + * @memirq: the &xe_memirq > + * @guc: the &xe_guc to check for IRQ > + * > + * Return: True if VF recovery IRQ is pending on @guc, False otherwise > + */ > +bool xe_memirq_vf_recovery_irq_pending(struct xe_memirq *memirq, > + struct xe_guc *guc) > +{ > + struct xe_gt *gt = guc_to_gt(guc); > + struct iosys_map map; > + > + if (xe_gt_is_media_type(gt)) > + map = IOSYS_MAP_INIT_OFFSET(&memirq->status, ilog2(INTR_MGUC) * SZ_16); > + else > + map = IOSYS_MAP_INIT_OFFSET(&memirq->status, ilog2(INTR_GUC) * SZ_16); nit: maybe just calc offset conditionally? u32 offset = is_media ? ilog2(INTR_MGUC) : ilog2(INTR_GUC); > + > + return iosys_map_rd(&map, ilog2(GUC_INTR_SW_INT_0), u8); as we have helpers we should use them return memirq_received_noclear(...) > +} > + > /** > * xe_memirq_handler - The `Memory Based Interrupts`_ Handler. > * @memirq: the &xe_memirq > diff --git a/drivers/gpu/drm/xe/xe_memirq.h b/drivers/gpu/drm/xe/xe_memirq.h > index 06130650e9d6..476b8cba179d 100644 > --- a/drivers/gpu/drm/xe/xe_memirq.h > +++ b/drivers/gpu/drm/xe/xe_memirq.h > @@ -25,4 +25,7 @@ void xe_memirq_handler(struct xe_memirq *memirq); > > int xe_memirq_init_guc(struct xe_memirq *memirq, struct xe_guc *guc); > > +bool xe_memirq_vf_recovery_irq_pending(struct xe_memirq *memirq, > + struct xe_guc *guc); > + > #endif