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SubjectRe: [Intel-gfx] [PATCH v2 1/2] drm/i915/gt: Move TLB invalidation to its own file
On Fri, Jul 29, 2022 at 09:03:54AM +0200, Mauro Carvalho Chehab wrote:
>From: Chris Wilson <chris.p.wilson@intel.com>
>
>Prepare for supporting more TLB invalidation scenarios by moving
>the current MMIO invalidation to its own file.

And looks like,
1. Rename intel_gt_invalidate_tlb() to intel_gt_invalidate_tlb_full()
2. Add intel_gt_init_tlb() and intel_gt_fini_tlb() abstracts.

Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>

>
>Signed-off-by: Chris Wilson <chris.p.wilson@intel.com>
>Cc: Fei Yang <fei.yang@intel.com>
>Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
>---
>
>To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
>See [PATCH v2 0/2] at: https://lore.kernel.org/all/cover.1659077372.git.mchehab@kernel.org/
>
> drivers/gpu/drm/i915/Makefile | 1 +
> drivers/gpu/drm/i915/gem/i915_gem_pages.c | 4 +-
> drivers/gpu/drm/i915/gt/intel_gt.c | 168 +-------------------
> drivers/gpu/drm/i915/gt/intel_gt.h | 12 --
> drivers/gpu/drm/i915/gt/intel_tlb.c | 183 ++++++++++++++++++++++
> drivers/gpu/drm/i915/gt/intel_tlb.h | 29 ++++
> drivers/gpu/drm/i915/i915_vma.c | 1 +
> 7 files changed, 219 insertions(+), 179 deletions(-)
> create mode 100644 drivers/gpu/drm/i915/gt/intel_tlb.c
> create mode 100644 drivers/gpu/drm/i915/gt/intel_tlb.h
>
>diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
>index 522ef9b4aff3..d3df9832d1f7 100644
>--- a/drivers/gpu/drm/i915/Makefile
>+++ b/drivers/gpu/drm/i915/Makefile
>@@ -126,6 +126,7 @@ gt-y += \
> gt/intel_sseu.o \
> gt/intel_sseu_debugfs.o \
> gt/intel_timeline.o \
>+ gt/intel_tlb.o \
> gt/intel_workarounds.o \
> gt/shmem_utils.o \
> gt/sysfs_engines.o
>diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
>index 8357dbdcab5c..1cd76cc5d9f3 100644
>--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
>+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
>@@ -7,7 +7,7 @@
> #include <drm/drm_cache.h>
>
> #include "gt/intel_gt.h"
>-#include "gt/intel_gt_pm.h"
>+#include "gt/intel_tlb.h"
>
> #include "i915_drv.h"
> #include "i915_gem_object.h"
>@@ -199,7 +199,7 @@ static void flush_tlb_invalidate(struct drm_i915_gem_object *obj)
> if (!obj->mm.tlb)
> return;
>
>- intel_gt_invalidate_tlb(gt, obj->mm.tlb);
>+ intel_gt_invalidate_tlb_full(gt, obj->mm.tlb);
> obj->mm.tlb = 0;
> }
>
>diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
>index f435e06125aa..18d82cd620bd 100644
>--- a/drivers/gpu/drm/i915/gt/intel_gt.c
>+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
>@@ -11,9 +11,7 @@
> #include "pxp/intel_pxp.h"
>
> #include "i915_drv.h"
>-#include "i915_perf_oa_regs.h"
> #include "intel_context.h"
>-#include "intel_engine_pm.h"
> #include "intel_engine_regs.h"
> #include "intel_ggtt_gmch.h"
> #include "intel_gt.h"
>@@ -31,6 +29,7 @@
> #include "intel_renderstate.h"
> #include "intel_rps.h"
> #include "intel_gt_sysfs.h"
>+#include "intel_tlb.h"
> #include "intel_uncore.h"
> #include "shmem_utils.h"
>
>@@ -48,8 +47,7 @@ static void __intel_gt_init_early(struct intel_gt *gt)
> intel_gt_init_reset(gt);
> intel_gt_init_requests(gt);
> intel_gt_init_timelines(gt);
>- mutex_init(&gt->tlb.invalidate_lock);
>- seqcount_mutex_init(&gt->tlb.seqno, &gt->tlb.invalidate_lock);
>+ intel_gt_init_tlb(gt);
> intel_gt_pm_init_early(gt);
>
> intel_uc_init_early(&gt->uc);
>@@ -770,7 +768,7 @@ void intel_gt_driver_late_release_all(struct drm_i915_private *i915)
> intel_gt_fini_requests(gt);
> intel_gt_fini_reset(gt);
> intel_gt_fini_timelines(gt);
>- mutex_destroy(&gt->tlb.invalidate_lock);
>+ intel_gt_fini_tlb(gt);
> intel_engines_free(gt);
> }
> }
>@@ -881,163 +879,3 @@ void intel_gt_info_print(const struct intel_gt_info *info,
>
> intel_sseu_dump(&info->sseu, p);
> }
>-
>-struct reg_and_bit {
>- i915_reg_t reg;
>- u32 bit;
>-};
>-
>-static struct reg_and_bit
>-get_reg_and_bit(const struct intel_engine_cs *engine, const bool gen8,
>- const i915_reg_t *regs, const unsigned int num)
>-{
>- const unsigned int class = engine->class;
>- struct reg_and_bit rb = { };
>-
>- if (drm_WARN_ON_ONCE(&engine->i915->drm,
>- class >= num || !regs[class].reg))
>- return rb;
>-
>- rb.reg = regs[class];
>- if (gen8 && class == VIDEO_DECODE_CLASS)
>- rb.reg.reg += 4 * engine->instance; /* GEN8_M2TCR */
>- else
>- rb.bit = engine->instance;
>-
>- rb.bit = BIT(rb.bit);
>-
>- return rb;
>-}
>-
>-static void mmio_invalidate_full(struct intel_gt *gt)
>-{
>- static const i915_reg_t gen8_regs[] = {
>- [RENDER_CLASS] = GEN8_RTCR,
>- [VIDEO_DECODE_CLASS] = GEN8_M1TCR, /* , GEN8_M2TCR */
>- [VIDEO_ENHANCEMENT_CLASS] = GEN8_VTCR,
>- [COPY_ENGINE_CLASS] = GEN8_BTCR,
>- };
>- static const i915_reg_t gen12_regs[] = {
>- [RENDER_CLASS] = GEN12_GFX_TLB_INV_CR,
>- [VIDEO_DECODE_CLASS] = GEN12_VD_TLB_INV_CR,
>- [VIDEO_ENHANCEMENT_CLASS] = GEN12_VE_TLB_INV_CR,
>- [COPY_ENGINE_CLASS] = GEN12_BLT_TLB_INV_CR,
>- [COMPUTE_CLASS] = GEN12_COMPCTX_TLB_INV_CR,
>- };
>- 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;
>- const i915_reg_t *regs;
>- unsigned int num = 0;
>-
>- if (GRAPHICS_VER(i915) == 12) {
>- regs = gen12_regs;
>- num = ARRAY_SIZE(gen12_regs);
>- } else if (GRAPHICS_VER(i915) >= 8 && GRAPHICS_VER(i915) <= 11) {
>- regs = gen8_regs;
>- num = ARRAY_SIZE(gen8_regs);
>- } else if (GRAPHICS_VER(i915) < 8) {
>- return;
>- }
>-
>- if (drm_WARN_ONCE(&i915->drm, !num,
>- "Platform does not implement TLB invalidation!"))
>- return;
>-
>- intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
>-
>- spin_lock_irq(&uncore->lock); /* serialise invalidate with GT reset */
>-
>- awake = 0;
>- for_each_engine(engine, gt, id) {
>- struct reg_and_bit rb;
>-
>- if (!intel_engine_pm_is_awake(engine))
>- continue;
>-
>- rb = get_reg_and_bit(engine, regs == gen8_regs, regs, num);
>- if (!i915_mmio_reg_offset(rb.reg))
>- continue;
>-
>- intel_uncore_write_fw(uncore, rb.reg, rb.bit);
>- 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_irq(&uncore->lock);
>-
>- for_each_engine_masked(engine, gt, awake, tmp) {
>- struct reg_and_bit rb;
>-
>- /*
>- * 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.
>- */
>- const unsigned int timeout_us = 100;
>- const unsigned int timeout_ms = 4;
>-
>- rb = get_reg_and_bit(engine, regs == gen8_regs, regs, num);
>- if (__intel_wait_for_register_fw(uncore,
>- rb.reg, rb.bit, 0,
>- timeout_us, timeout_ms,
>- NULL))
>- drm_err_ratelimited(&gt->i915->drm,
>- "%s TLB invalidation did not complete in %ums!\n",
>- engine->name, 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(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(&gt->tlb.invalidate_lock);
>- if (tlb_seqno_passed(gt, seqno))
>- goto unlock;
>-
>- mmio_invalidate_full(gt);
>-
>- write_seqcount_invalidate(&gt->tlb.seqno);
>-unlock:
>- mutex_unlock(&gt->tlb.invalidate_lock);
>- }
>-}
>diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
>index 40b06adf509a..b4bba16cdb53 100644
>--- a/drivers/gpu/drm/i915/gt/intel_gt.h
>+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
>@@ -101,16 +101,4 @@ void intel_gt_info_print(const struct intel_gt_info *info,
>
> void intel_gt_watchdog_work(struct work_struct *work);
>
>-static inline u32 intel_gt_tlb_seqno(const struct intel_gt *gt)
>-{
>- return seqprop_sequence(&gt->tlb.seqno);
>-}
>-
>-static inline u32 intel_gt_next_invalidate_tlb_full(const struct intel_gt *gt)
>-{
>- return intel_gt_tlb_seqno(gt) | 1;
>-}
>-
>-void intel_gt_invalidate_tlb(struct intel_gt *gt, u32 seqno);
>-
> #endif /* __INTEL_GT_H__ */
>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..af8cae979489
>--- /dev/null
>+++ b/drivers/gpu/drm/i915/gt/intel_tlb.c
>@@ -0,0 +1,183 @@
>+// SPDX-License-Identifier: MIT
>+/*
>+ * Copyright © 2022 Intel Corporation
>+ */
>+
>+#include "i915_drv.h"
>+#include "i915_perf_oa_regs.h"
>+#include "intel_engine_pm.h"
>+#include "intel_gt.h"
>+#include "intel_gt_pm.h"
>+#include "intel_gt_regs.h"
>+#include "intel_tlb.h"
>+
>+struct reg_and_bit {
>+ i915_reg_t reg;
>+ u32 bit;
>+};
>+
>+static struct reg_and_bit
>+get_reg_and_bit(const struct intel_engine_cs *engine, const bool gen8,
>+ const i915_reg_t *regs, const unsigned int num)
>+{
>+ const unsigned int class = engine->class;
>+ struct reg_and_bit rb = { };
>+
>+ if (drm_WARN_ON_ONCE(&engine->i915->drm,
>+ class >= num || !regs[class].reg))
>+ return rb;
>+
>+ rb.reg = regs[class];
>+ if (gen8 && class == VIDEO_DECODE_CLASS)
>+ rb.reg.reg += 4 * engine->instance; /* GEN8_M2TCR */
>+ else
>+ rb.bit = engine->instance;
>+
>+ rb.bit = BIT(rb.bit);
>+
>+ return rb;
>+}
>+
>+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;
>+}
>+
>+static void mmio_invalidate_full(struct intel_gt *gt)
>+{
>+ static const i915_reg_t gen8_regs[] = {
>+ [RENDER_CLASS] = GEN8_RTCR,
>+ [VIDEO_DECODE_CLASS] = GEN8_M1TCR, /* , GEN8_M2TCR */
>+ [VIDEO_ENHANCEMENT_CLASS] = GEN8_VTCR,
>+ [COPY_ENGINE_CLASS] = GEN8_BTCR,
>+ };
>+ static const i915_reg_t gen12_regs[] = {
>+ [RENDER_CLASS] = GEN12_GFX_TLB_INV_CR,
>+ [VIDEO_DECODE_CLASS] = GEN12_VD_TLB_INV_CR,
>+ [VIDEO_ENHANCEMENT_CLASS] = GEN12_VE_TLB_INV_CR,
>+ [COPY_ENGINE_CLASS] = GEN12_BLT_TLB_INV_CR,
>+ [COMPUTE_CLASS] = GEN12_COMPCTX_TLB_INV_CR,
>+ };
>+ 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;
>+ const i915_reg_t *regs;
>+ unsigned int num = 0;
>+
>+ if (GRAPHICS_VER(i915) == 12) {
>+ regs = gen12_regs;
>+ num = ARRAY_SIZE(gen12_regs);
>+ } else if (GRAPHICS_VER(i915) >= 8 && GRAPHICS_VER(i915) <= 11) {
>+ regs = gen8_regs;
>+ num = ARRAY_SIZE(gen8_regs);
>+ } else if (GRAPHICS_VER(i915) < 8) {
>+ return;
>+ }
>+
>+ if (drm_WARN_ONCE(&i915->drm, !num,
>+ "Platform does not implement TLB invalidation!"))
>+ return;
>+
>+ intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
>+
>+ spin_lock_irq(&uncore->lock); /* serialise invalidate with GT reset */
>+
>+ awake = 0;
>+ for_each_engine(engine, gt, id) {
>+ struct reg_and_bit rb;
>+
>+ if (!intel_engine_pm_is_awake(engine))
>+ continue;
>+
>+ rb = get_reg_and_bit(engine, regs == gen8_regs, regs, num);
>+ if (!i915_mmio_reg_offset(rb.reg))
>+ continue;
>+
>+ intel_uncore_write_fw(uncore, rb.reg, rb.bit);
>+ 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_irq(&uncore->lock);
>+
>+ for_each_engine_masked(engine, gt, awake, tmp) {
>+ struct reg_and_bit rb;
>+
>+ /*
>+ * 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.
>+ */
>+ const unsigned int timeout_us = 100;
>+ const unsigned int timeout_ms = 4;
>+
>+ rb = get_reg_and_bit(engine, regs == gen8_regs, regs, num);
>+ if (__intel_wait_for_register_fw(uncore,
>+ rb.reg, rb.bit, 0,
>+ timeout_us, timeout_ms,
>+ NULL))
>+ drm_err_ratelimited(&gt->i915->drm,
>+ "%s TLB invalidation did not complete in %ums!\n",
>+ engine->name, 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);
>+}
>+
>+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(&gt->tlb.invalidate_lock);
>+ if (tlb_seqno_passed(gt, seqno))
>+ goto unlock;
>+
>+ mmio_invalidate_full(gt);
>+
>+ write_seqcount_invalidate(&gt->tlb.seqno);
>+unlock:
>+ mutex_unlock(&gt->tlb.invalidate_lock);
>+ }
>+}
>+
>+void intel_gt_init_tlb(struct intel_gt *gt)
>+{
>+ mutex_init(&gt->tlb.invalidate_lock);
>+ seqcount_mutex_init(&gt->tlb.seqno, &gt->tlb.invalidate_lock);
>+}
>+
>+void intel_gt_fini_tlb(struct intel_gt *gt)
>+{
>+ mutex_destroy(&gt->tlb.invalidate_lock);
>+}
>diff --git a/drivers/gpu/drm/i915/gt/intel_tlb.h b/drivers/gpu/drm/i915/gt/intel_tlb.h
>new file mode 100644
>index 000000000000..46ce25bf5afe
>--- /dev/null
>+++ b/drivers/gpu/drm/i915/gt/intel_tlb.h
>@@ -0,0 +1,29 @@
>+/* SPDX-License-Identifier: MIT */
>+/*
>+ * Copyright © 2022 Intel Corporation
>+ */
>+
>+#ifndef INTEL_TLB_H
>+#define INTEL_TLB_H
>+
>+#include <linux/seqlock.h>
>+#include <linux/types.h>
>+
>+#include "intel_gt_types.h"
>+
>+void intel_gt_invalidate_tlb_full(struct intel_gt *gt, u32 seqno);
>+
>+void intel_gt_init_tlb(struct intel_gt *gt);
>+void intel_gt_fini_tlb(struct intel_gt *gt);
>+
>+static inline u32 intel_gt_tlb_seqno(const struct intel_gt *gt)
>+{
>+ return seqprop_sequence(&gt->tlb.seqno);
>+}
>+
>+static inline u32 intel_gt_next_invalidate_tlb_full(const struct intel_gt *gt)
>+{
>+ return intel_gt_tlb_seqno(gt) | 1;
>+}
>+
>+#endif /* INTEL_TLB_H */
>diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
>index 84a9ccbc5fc5..fe947d1456d5 100644
>--- a/drivers/gpu/drm/i915/i915_vma.c
>+++ b/drivers/gpu/drm/i915/i915_vma.c
>@@ -33,6 +33,7 @@
> #include "gt/intel_engine_heartbeat.h"
> #include "gt/intel_gt.h"
> #include "gt/intel_gt_requests.h"
>+#include "gt/intel_tlb.h"
>
> #include "i915_drv.h"
> #include "i915_gem_evict.h"
>--
>2.36.1
>

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