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// 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
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