diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_tlb.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_tlb.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_tlb.c b/drivers/gpu/drm/i915/gt/intel_tlb.c new file mode 100644 index 000000000000..139608c30d97 --- /dev/null +++ b/drivers/gpu/drm/i915/gt/intel_tlb.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2023 Intel Corporation + */ + +#include "i915_drv.h" +#include "i915_perf_oa_regs.h" +#include "intel_engine_pm.h" +#include "intel_gt.h" +#include "intel_gt_mcr.h" +#include "intel_gt_pm.h" +#include "intel_gt_print.h" +#include "intel_gt_regs.h" +#include "intel_tlb.h" + +/* + * HW architecture suggest typical invalidation time at 40us, + * with pessimistic cases up to 100us and a recommendation to + * cap at 1ms. We go a bit higher just in case. + */ +#define TLB_INVAL_TIMEOUT_US 100 +#define TLB_INVAL_TIMEOUT_MS 4 + +/* + * On Xe_HP the TLB invalidation registers are located at the same MMIO offsets + * but are now considered MCR registers. Since they exist within a GAM range, + * the primary instance of the register rolls up the status from each unit. + */ +static int wait_for_invalidate(struct intel_engine_cs *engine) +{ + if (engine->tlb_inv.mcr) + return intel_gt_mcr_wait_for_reg(engine->gt, + engine->tlb_inv.reg.mcr_reg, + engine->tlb_inv.done, + 0, + TLB_INVAL_TIMEOUT_US, + TLB_INVAL_TIMEOUT_MS); + else + return __intel_wait_for_register_fw(engine->gt->uncore, + engine->tlb_inv.reg.reg, + engine->tlb_inv.done, + 0, + TLB_INVAL_TIMEOUT_US, + TLB_INVAL_TIMEOUT_MS, + NULL); +} + +static void mmio_invalidate_full(struct intel_gt *gt) +{ + struct drm_i915_private *i915 = gt->i915; + struct intel_uncore *uncore = gt->uncore; + struct intel_engine_cs *engine; + intel_engine_mask_t awake, tmp; + enum intel_engine_id id; + unsigned long flags; + + if (GRAPHICS_VER(i915) < 8) + return; + + intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL); + + intel_gt_mcr_lock(gt, &flags); + spin_lock(&uncore->lock); /* serialise invalidate with GT reset */ + + awake = 0; + for_each_engine(engine, gt, id) { + if (!intel_engine_pm_is_awake(engine)) + continue; + + if (engine->tlb_inv.mcr) + intel_gt_mcr_multicast_write_fw(gt, + engine->tlb_inv.reg.mcr_reg, + engine->tlb_inv.request); + else + intel_uncore_write_fw(uncore, + engine->tlb_inv.reg.reg, + engine->tlb_inv.request); + + awake |= engine->mask; + } + + GT_TRACE(gt, "invalidated engines %08x\n", awake); + + /* Wa_2207587034:tgl,dg1,rkl,adl-s,adl-p */ + if (awake && + (IS_TIGERLAKE(i915) || + IS_DG1(i915) || + IS_ROCKETLAKE(i915) || + IS_ALDERLAKE_S(i915) || + IS_ALDERLAKE_P(i915))) + intel_uncore_write_fw(uncore, GEN12_OA_TLB_INV_CR, 1); + + spin_unlock(&uncore->lock); + intel_gt_mcr_unlock(gt, flags); + + for_each_engine_masked(engine, gt, awake, tmp) { + if (wait_for_invalidate(engine)) + gt_err_ratelimited(gt, + "%s TLB invalidation did not complete in %ums!\n", + engine->name, TLB_INVAL_TIMEOUT_MS); + } + + /* + * Use delayed put since a) we mostly expect a flurry of TLB + * invalidations so it is good to avoid paying the forcewake cost and + * b) it works around a bug in Icelake which cannot cope with too rapid + * transitions. + */ + intel_uncore_forcewake_put_delayed(uncore, FORCEWAKE_ALL); +} + +static bool tlb_seqno_passed(const struct intel_gt *gt, u32 seqno) +{ + u32 cur = intel_gt_tlb_seqno(gt); + + /* Only skip if a *full* TLB invalidate barrier has passed */ + return (s32)(cur - ALIGN(seqno, 2)) > 0; +} + +void intel_gt_invalidate_tlb_full(struct intel_gt *gt, u32 seqno) +{ + intel_wakeref_t wakeref; + + if (I915_SELFTEST_ONLY(gt->awake == -ENODEV)) + return; + + if (intel_gt_is_wedged(gt)) + return; + + if (tlb_seqno_passed(gt, seqno)) + return; + + with_intel_gt_pm_if_awake(gt, wakeref) { + mutex_lock(>->tlb.invalidate_lock); + if (tlb_seqno_passed(gt, seqno)) + goto unlock; + + mmio_invalidate_full(gt); + + write_seqcount_invalidate(>->tlb.seqno); +unlock: + mutex_unlock(>->tlb.invalidate_lock); + } +} + +void intel_gt_init_tlb(struct intel_gt *gt) +{ + mutex_init(>->tlb.invalidate_lock); + seqcount_mutex_init(>->tlb.seqno, >->tlb.invalidate_lock); +} + +void intel_gt_fini_tlb(struct intel_gt *gt) +{ + mutex_destroy(>->tlb.invalidate_lock); +} + +#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) +#include "selftest_tlb.c" +#endif |