From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Matthew Auld <matthew.auld@intel.com>,
Matthew Auld <matthew.william.auld@gmail.com>
Cc: Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
ML dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [Intel-gfx] [PATCH 11/19] drm/i915: Update the helper to set correct mapping
Date: Mon, 19 Apr 2021 15:07:42 +0100 [thread overview]
Message-ID: <5701f034-3da9-55d2-e966-33afb7236b8b@linux.intel.com> (raw)
In-Reply-To: <55e16b78-d9ee-a0ad-5877-9901cf74669f@intel.com>
On 19/04/2021 12:30, Matthew Auld wrote:
> On 15/04/2021 12:05, Tvrtko Ursulin wrote:
>>
>> On 15/04/2021 10:23, Matthew Auld wrote:
>>> On Thu, 15 Apr 2021 at 09:21, Tvrtko Ursulin
>>> <tvrtko.ursulin@linux.intel.com> wrote:
>>>>
>>>>
>>>> On 14/04/2021 17:20, Matthew Auld wrote:
>>>>> On Wed, 14 Apr 2021 at 16:22, Tvrtko Ursulin
>>>>> <tvrtko.ursulin@linux.intel.com> wrote:
>>>>>>
>>>>>>
>>>>>> On 12/04/2021 10:05, Matthew Auld wrote:
>>>>>>> From: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota@intel.com>
>>>>>>>
>>>>>>> Determine the possible coherent map type based on object location,
>>>>>>> and if target has llc or if user requires an always coherent
>>>>>>> mapping.
>>>>>>>
>>>>>>> Cc: Matthew Auld <matthew.auld@intel.com>
>>>>>>> Cc: CQ Tang <cq.tang@intel.com>
>>>>>>> Suggested-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
>>>>>>> Signed-off-by: Venkata Sandeep Dhanalakota
>>>>>>> <venkata.s.dhanalakota@intel.com>
>>>>>>> ---
>>>>>>> drivers/gpu/drm/i915/gt/intel_engine_cs.c | 3 ++-
>>>>>>> drivers/gpu/drm/i915/gt/intel_engine_pm.c | 2 +-
>>>>>>> drivers/gpu/drm/i915/gt/intel_lrc.c | 4 +++-
>>>>>>> drivers/gpu/drm/i915/gt/intel_ring.c | 9 ++++++---
>>>>>>> drivers/gpu/drm/i915/gt/selftest_context.c | 3 ++-
>>>>>>> drivers/gpu/drm/i915/gt/selftest_hangcheck.c | 4 ++--
>>>>>>> drivers/gpu/drm/i915/gt/selftest_lrc.c | 4 +++-
>>>>>>> drivers/gpu/drm/i915/gt/uc/intel_guc.c | 4 +++-
>>>>>>> drivers/gpu/drm/i915/gt/uc/intel_huc.c | 4 +++-
>>>>>>> drivers/gpu/drm/i915/i915_drv.h | 11 +++++++++--
>>>>>>> drivers/gpu/drm/i915/selftests/igt_spinner.c | 4 ++--
>>>>>>> 11 files changed, 36 insertions(+), 16 deletions(-)
>>>>>>>
>>>>>>> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
>>>>>>> b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
>>>>>>> index efe935f80c1a..b79568d370f5 100644
>>>>>>> --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
>>>>>>> +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
>>>>>>> @@ -664,7 +664,8 @@ static int init_status_page(struct
>>>>>>> intel_engine_cs *engine)
>>>>>>> if (ret)
>>>>>>> goto err;
>>>>>>>
>>>>>>> - vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
>>>>>>> + vaddr = i915_gem_object_pin_map(obj,
>>>>>>> + i915_coherent_map_type(engine->i915, obj, true));
>>>>>>> if (IS_ERR(vaddr)) {
>>>>>>> ret = PTR_ERR(vaddr);
>>>>>>> goto err_unpin;
>>>>>>> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c
>>>>>>> b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
>>>>>>> index 7c9af86fdb1e..47f4397095e5 100644
>>>>>>> --- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c
>>>>>>> +++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
>>>>>>> @@ -23,7 +23,7 @@ static void dbg_poison_ce(struct intel_context
>>>>>>> *ce)
>>>>>>>
>>>>>>> if (ce->state) {
>>>>>>> struct drm_i915_gem_object *obj = ce->state->obj;
>>>>>>> - int type = i915_coherent_map_type(ce->engine->i915);
>>>>>>> + int type = i915_coherent_map_type(ce->engine->i915,
>>>>>>> obj, true);
>>>>>>> void *map;
>>>>>>>
>>>>>>> if (!i915_gem_object_trylock(obj))
>>>>>>> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c
>>>>>>> b/drivers/gpu/drm/i915/gt/intel_lrc.c
>>>>>>> index e86897cde984..aafe2a4df496 100644
>>>>>>> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
>>>>>>> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
>>>>>>> @@ -903,7 +903,9 @@ lrc_pre_pin(struct intel_context *ce,
>>>>>>> GEM_BUG_ON(!i915_vma_is_pinned(ce->state));
>>>>>>>
>>>>>>> *vaddr = i915_gem_object_pin_map(ce->state->obj,
>>>>>>> - i915_coherent_map_type(ce->engine->i915) |
>>>>>>> + i915_coherent_map_type(ce->engine->i915,
>>>>>>> + ce->state->obj,
>>>>>>> + false) |
>>>>>>> I915_MAP_OVERRIDE);
>>>>>>>
>>>>>>> return PTR_ERR_OR_ZERO(*vaddr);
>>>>>>> diff --git a/drivers/gpu/drm/i915/gt/intel_ring.c
>>>>>>> b/drivers/gpu/drm/i915/gt/intel_ring.c
>>>>>>> index aee0a77c77e0..3cf6c7e68108 100644
>>>>>>> --- a/drivers/gpu/drm/i915/gt/intel_ring.c
>>>>>>> +++ b/drivers/gpu/drm/i915/gt/intel_ring.c
>>>>>>> @@ -53,9 +53,12 @@ int intel_ring_pin(struct intel_ring *ring,
>>>>>>> struct i915_gem_ww_ctx *ww)
>>>>>>>
>>>>>>> if (i915_vma_is_map_and_fenceable(vma))
>>>>>>> addr = (void __force *)i915_vma_pin_iomap(vma);
>>>>>>> - else
>>>>>>> - addr = i915_gem_object_pin_map(vma->obj,
>>>>>>> - i915_coherent_map_type(vma->vm->i915));
>>>>>>> + else {
>>>>>>> + int type = i915_coherent_map_type(vma->vm->i915,
>>>>>>> vma->obj, false);
>>>>>>> +
>>>>>>> + addr = i915_gem_object_pin_map(vma->obj, type);
>>>>>>> + }
>>>>>>> +
>>>>>>> if (IS_ERR(addr)) {
>>>>>>> ret = PTR_ERR(addr);
>>>>>>> goto err_ring;
>>>>>>> diff --git a/drivers/gpu/drm/i915/gt/selftest_context.c
>>>>>>> b/drivers/gpu/drm/i915/gt/selftest_context.c
>>>>>>> index b9bdd1d23243..26685b927169 100644
>>>>>>> --- a/drivers/gpu/drm/i915/gt/selftest_context.c
>>>>>>> +++ b/drivers/gpu/drm/i915/gt/selftest_context.c
>>>>>>> @@ -88,7 +88,8 @@ static int __live_context_size(struct
>>>>>>> intel_engine_cs *engine)
>>>>>>> goto err;
>>>>>>>
>>>>>>> vaddr = i915_gem_object_pin_map_unlocked(ce->state->obj,
>>>>>>> - i915_coherent_map_type(engine->i915));
>>>>>>> + i915_coherent_map_type(engine->i915,
>>>>>>> + ce->state->obj, false));
>>>>>>> if (IS_ERR(vaddr)) {
>>>>>>> err = PTR_ERR(vaddr);
>>>>>>> intel_context_unpin(ce);
>>>>>>> diff --git a/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
>>>>>>> b/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
>>>>>>> index 746985971c3a..5b63d4df8c93 100644
>>>>>>> --- a/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
>>>>>>> +++ b/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
>>>>>>> @@ -69,7 +69,7 @@ static int hang_init(struct hang *h, struct
>>>>>>> intel_gt *gt)
>>>>>>> h->seqno = memset(vaddr, 0xff, PAGE_SIZE);
>>>>>>>
>>>>>>> vaddr = i915_gem_object_pin_map_unlocked(h->obj,
>>>>>>> - i915_coherent_map_type(gt->i915));
>>>>>>> + i915_coherent_map_type(gt->i915, h->obj, false));
>>>>>>> if (IS_ERR(vaddr)) {
>>>>>>> err = PTR_ERR(vaddr);
>>>>>>> goto err_unpin_hws;
>>>>>>> @@ -130,7 +130,7 @@ hang_create_request(struct hang *h, struct
>>>>>>> intel_engine_cs *engine)
>>>>>>> return ERR_CAST(obj);
>>>>>>> }
>>>>>>>
>>>>>>> - vaddr = i915_gem_object_pin_map_unlocked(obj,
>>>>>>> i915_coherent_map_type(gt->i915));
>>>>>>> + vaddr = i915_gem_object_pin_map_unlocked(obj,
>>>>>>> i915_coherent_map_type(gt->i915, obj, false));
>>>>>>> if (IS_ERR(vaddr)) {
>>>>>>> i915_gem_object_put(obj);
>>>>>>> i915_vm_put(vm);
>>>>>>> diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c
>>>>>>> b/drivers/gpu/drm/i915/gt/selftest_lrc.c
>>>>>>> index 85e7df6a5123..d8f6623524e8 100644
>>>>>>> --- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
>>>>>>> +++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
>>>>>>> @@ -1221,7 +1221,9 @@ static int compare_isolation(struct
>>>>>>> intel_engine_cs *engine,
>>>>>>> }
>>>>>>>
>>>>>>> lrc = i915_gem_object_pin_map_unlocked(ce->state->obj,
>>>>>>> - i915_coherent_map_type(engine->i915));
>>>>>>> + i915_coherent_map_type(engine->i915,
>>>>>>> +
>>>>>>> ce->state->obj,
>>>>>>> +
>>>>>>> false));
>>>>>>> if (IS_ERR(lrc)) {
>>>>>>> err = PTR_ERR(lrc);
>>>>>>> goto err_B1;
>>>>>>> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
>>>>>>> b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
>>>>>>> index 78305b2ec89d..adae04c47aab 100644
>>>>>>> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
>>>>>>> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
>>>>>>> @@ -682,7 +682,9 @@ int intel_guc_allocate_and_map_vma(struct
>>>>>>> intel_guc *guc, u32 size,
>>>>>>> if (IS_ERR(vma))
>>>>>>> return PTR_ERR(vma);
>>>>>>>
>>>>>>> - vaddr = i915_gem_object_pin_map_unlocked(vma->obj,
>>>>>>> I915_MAP_WB);
>>>>>>> + vaddr = i915_gem_object_pin_map_unlocked(vma->obj,
>>>>>>> + i915_coherent_map_type(guc_to_gt(guc)->i915,
>>>>>>> + vma->obj, true));
>>>>>>> if (IS_ERR(vaddr)) {
>>>>>>> i915_vma_unpin_and_release(&vma, 0);
>>>>>>> return PTR_ERR(vaddr);
>>>>>>> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.c
>>>>>>> b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
>>>>>>> index 2126dd81ac38..56d2144dc6a0 100644
>>>>>>> --- a/drivers/gpu/drm/i915/gt/uc/intel_huc.c
>>>>>>> +++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
>>>>>>> @@ -82,7 +82,9 @@ static int intel_huc_rsa_data_create(struct
>>>>>>> intel_huc *huc)
>>>>>>> if (IS_ERR(vma))
>>>>>>> return PTR_ERR(vma);
>>>>>>>
>>>>>>> - vaddr = i915_gem_object_pin_map_unlocked(vma->obj,
>>>>>>> I915_MAP_WB);
>>>>>>> + vaddr = i915_gem_object_pin_map_unlocked(vma->obj,
>>>>>>> + i915_coherent_map_type(gt->i915,
>>>>>>> + vma->obj, true));
>>>>>>> if (IS_ERR(vaddr)) {
>>>>>>> i915_vma_unpin_and_release(&vma, 0);
>>>>>>> return PTR_ERR(vaddr);
>>>>>>> diff --git a/drivers/gpu/drm/i915/i915_drv.h
>>>>>>> b/drivers/gpu/drm/i915/i915_drv.h
>>>>>>> index 69e43bf91a15..2abbc06712a4 100644
>>>>>>> --- a/drivers/gpu/drm/i915/i915_drv.h
>>>>>>> +++ b/drivers/gpu/drm/i915/i915_drv.h
>>>>>>> @@ -78,6 +78,7 @@
>>>>>>> #include "gem/i915_gem_context_types.h"
>>>>>>> #include "gem/i915_gem_shrinker.h"
>>>>>>> #include "gem/i915_gem_stolen.h"
>>>>>>> +#include "gem/i915_gem_lmem.h"
>>>>>>>
>>>>>>> #include "gt/intel_engine.h"
>>>>>>> #include "gt/intel_gt_types.h"
>>>>>>> @@ -1921,9 +1922,15 @@ static inline int
>>>>>>> intel_hws_csb_write_index(struct drm_i915_private *i915)
>>>>>>> }
>>>>>>>
>>>>>>> static inline enum i915_map_type
>>>>>>> -i915_coherent_map_type(struct drm_i915_private *i915)
>>>>>>> +i915_coherent_map_type(struct drm_i915_private *i915,
>>>>>>> + struct drm_i915_gem_object *obj, bool
>>>>>>> always_coherent)
>>>>>>> {
>>>>>>> - return HAS_LLC(i915) ? I915_MAP_WB : I915_MAP_WC;
>>>>>>> + if (i915_gem_object_is_lmem(obj))
>>>>>>> + return I915_MAP_WC;
>>>>>>> + if (HAS_LLC(i915) || always_coherent)
>>>>>>> + return I915_MAP_WB;
>>>>>>> + else
>>>>>>> + return I915_MAP_WC;
>>>>>>
>>>>>> Seems this patch is doing two things.
>>>>>>
>>>>>> First it is adding lmem support to this helper by always returning WC
>>>>>> for lmem objects.
>>>>>>
>>>>>> Secondly it is introducing an idea of "always coherent" in a helper
>>>>>> called i915_coherent_map_type. Could someone explain what is
>>>>>> coherent vs
>>>>>> always coherent?
>>>>>>
>>>>>> And also, why is always coherent happy with WB? Sounds counter
>>>>>> intuitive
>>>>>> to me.
>>>>>
>>>>> All this does is try to keep the existing behaviour intact, whilst
>>>>> also ensuring that all lmem objects are mapped using only WC, no
>>>>> matter what. The always_coherent=true thing is for the existing places
>>>>> where we sometimes map the object using WB, without first considering
>>>>> whether the device has the fast shared LLC vs snooping. Yes, it's
>>>>> slightly ugly :)
>>>>
>>>> Not fully following - if we had to write kerneldoc for always_coherent
>>>> input argument - what it would say?
>>>
>>> @always_coherent - If true we should always try to map the object
>>> using WB. If false we should only map as WB if the device supports the
>>> fast shared LLC, in the case of snooped devices we will map use WC.
>>> Note that If the resource is lmem then we will always map as WC,
>>> regardless of the value of always_coherent, since that's all we
>>> currently support.
>>>
>>> Maybe the naming is poor?
>>
>> Maybe just confusing to me, not sure yet.
>>
>> So always_coherent is not about how the callers wants to use it, but
>> about platform knowledge? Or a performance concern for LLC vs snooping
>> cases? Does WB works (coherently) on snooping platforms?
>
> The always_coherent=true is for the existing callers that want WB,
> regardless of LLC vs snooping.
>
> The other callers use the existing i915_coherent_map_type() which only
> gives out WB for LLC platforms.
>
> AFAIK, LLC vs snooping should offer the same in terms of coherency, but
> in terms of performance the shared LLC is much faster, and so for
> snooping platforms we choose to not enable WB everywhere.
>
> On top of that we now have lmem, but for that we only allow WC. This
> patch just rolls all of that into one helper, while keeping the existing
> behaviour unchanged.
Thanks. But I am still struggling with the API. :(
Is the introduction of always_coherent flag in the context of DG1
required even? AFAICT for lmem objects the flag is ignored so no?
Regards,
Tvrtko
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next prev parent reply other threads:[~2021-04-19 14:07 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-12 9:05 [Intel-gfx] [PATCH 00/19] More DG1 enabling Matthew Auld
2021-04-12 9:05 ` [Intel-gfx] [PATCH 01/19] drm/i915/gt: Skip aperture remapping selftest where there is no aperture Matthew Auld
2021-04-12 14:48 ` Daniel Vetter
2021-04-12 9:05 ` [Intel-gfx] [PATCH 02/19] drm/i915/selftests: Only query RAPL for integrated power measurements Matthew Auld
2021-04-12 9:05 ` [Intel-gfx] [PATCH 03/19] drm/i915: Create stolen memory region from local memory Matthew Auld
2021-04-14 15:01 ` Tvrtko Ursulin
2021-04-16 15:04 ` Matthew Auld
2021-04-19 14:15 ` Tvrtko Ursulin
2021-04-12 9:05 ` [Intel-gfx] [PATCH 04/19] drm/i915/stolen: treat stolen local as normal " Matthew Auld
2021-04-14 15:06 ` Tvrtko Ursulin
2021-04-12 9:05 ` [Intel-gfx] [PATCH 05/19] drm/i915/stolen: enforce the min_page_size contract Matthew Auld
2021-04-14 15:07 ` Tvrtko Ursulin
2021-04-12 9:05 ` [Intel-gfx] [PATCH 06/19] drm/i915/stolen: pass the allocation flags Matthew Auld
2021-04-14 15:09 ` Tvrtko Ursulin
2021-04-16 13:53 ` Matthew Auld
2021-04-12 9:05 ` [Intel-gfx] [PATCH 07/19] drm/i915/fbdev: Use lmem physical addresses for fb_mmap() on discrete Matthew Auld
2021-04-12 15:00 ` Daniel Vetter
2021-04-12 9:05 ` [Intel-gfx] [PATCH 08/19] drm/i915: Return error value when bo not in LMEM for discrete Matthew Auld
2021-04-14 15:16 ` Tvrtko Ursulin
2021-04-12 9:05 ` [Intel-gfx] [PATCH 09/19] drm/i915/lmem: Fail driver init if LMEM training failed Matthew Auld
2021-04-12 9:05 ` [Intel-gfx] [PATCH 10/19] drm/i915/dg1: Fix mapping type for default state object Matthew Auld
2021-04-12 9:05 ` [Intel-gfx] [PATCH 11/19] drm/i915: Update the helper to set correct mapping Matthew Auld
2021-04-14 15:22 ` Tvrtko Ursulin
2021-04-14 16:20 ` Matthew Auld
2021-04-15 8:20 ` Tvrtko Ursulin
2021-04-15 9:23 ` Matthew Auld
2021-04-15 11:05 ` Tvrtko Ursulin
2021-04-19 11:30 ` Matthew Auld
2021-04-19 14:07 ` Tvrtko Ursulin [this message]
2021-04-19 14:37 ` Matthew Auld
2021-04-19 15:01 ` Tvrtko Ursulin
2021-04-21 11:42 ` Matthew Auld
2021-04-21 15:41 ` Tvrtko Ursulin
2021-04-21 19:13 ` Matthew Auld
2021-04-26 8:57 ` Matthew Auld
2021-04-26 9:21 ` Tvrtko Ursulin
2021-04-12 9:05 ` [Intel-gfx] [PATCH 12/19] drm/i915/lmem: Bypass aperture when lmem is available Matthew Auld
2021-04-14 15:33 ` Tvrtko Ursulin
2021-04-16 14:25 ` Matthew Auld
2021-04-19 14:16 ` Tvrtko Ursulin
2021-04-12 9:05 ` [Intel-gfx] [PATCH 13/19] drm/i915/dg1: Read OPROM via SPI controller Matthew Auld
2021-09-17 23:29 ` Lucas De Marchi
2021-04-12 9:05 ` [Intel-gfx] [PATCH 14/19] drm/i915/oprom: Basic sanitization Matthew Auld
2021-04-12 22:36 ` kernel test robot
2021-04-12 22:36 ` [Intel-gfx] [PATCH] drm/i915/oprom: fix memdup.cocci warnings kernel test robot
2021-05-17 11:57 ` [Intel-gfx] [PATCH 14/19] drm/i915/oprom: Basic sanitization Jani Nikula
2021-09-18 4:30 ` Lucas De Marchi
2021-09-20 7:41 ` Jani Nikula
2021-09-20 8:04 ` Gupta, Anshuman
2021-09-20 8:43 ` Jani Nikula
2021-09-22 21:53 ` Lucas De Marchi
2021-04-12 9:05 ` [Intel-gfx] [PATCH 15/19] drm/i915: WA for zero memory channel Matthew Auld
2021-04-12 16:57 ` Souza, Jose
2021-04-12 9:05 ` [Intel-gfx] [PATCH 16/19] drm/i915/dg1: Compute MEM Bandwidth using MCHBAR Matthew Auld
2021-04-12 9:05 ` [Intel-gfx] [PATCH 17/19] drm/i915/dg1: Double memory bandwidth available Matthew Auld
2021-04-12 9:05 ` [Intel-gfx] [PATCH 18/19] drm/i915/gtt: map the PD up front Matthew Auld
2021-04-12 15:17 ` Daniel Vetter
2021-04-12 16:01 ` Jani Nikula
2021-04-12 16:36 ` Daniel Vetter
2021-04-12 16:08 ` Matthew Auld
2021-04-12 17:00 ` Daniel Vetter
2021-04-13 9:28 ` Matthew Auld
2021-04-13 10:18 ` Daniel Vetter
2021-04-12 9:05 ` [Intel-gfx] [PATCH 19/19] drm/i915/gtt/dgfx: place the PD in LMEM Matthew Auld
2021-04-14 15:37 ` Tvrtko Ursulin
2021-04-12 11:07 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for More DG1 enabling Patchwork
2021-04-12 11:12 ` [Intel-gfx] ✗ Fi.CI.DOCS: " Patchwork
2021-04-12 11:37 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-04-12 13:37 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
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