[PATCH] drm/amdgpu: refine kiq read register
Liu, Shaoyun
Shaoyun.Liu at amd.com
Mon Apr 20 15:18:30 UTC 2020
[AMD Official Use Only - Internal Distribution Only]
I didn't calculate the exact required DW used for on e kiq read ( currently use 32 DW) , That's assume it's right , Can we just alloc 2 more here ? Since each kiq_read will do the allocation , it won't conflict with other read operation.
Shaoyun.liu
-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Liu, Monk
Sent: Monday, April 20, 2020 5:28 AM
To: Koenig, Christian <Christian.Koenig at amd.com>; Kuehling, Felix <Felix.Kuehling at amd.com>; Tao, Yintian <Yintian.Tao at amd.com>
Cc: amd-gfx at lists.freedesktop.org
Subject: RE: [PATCH] drm/amdgpu: refine kiq read register
So why don't we let gpu scheduler to manage KIQ, and all client of KIQ need to submit jobs within an IB ?
_____________________________________
Monk Liu|GPU Virtualization Team |AMD
-----Original Message-----
From: Christian König <ckoenig.leichtzumerken at gmail.com>
Sent: Monday, April 20, 2020 4:48 PM
To: Liu, Monk <Monk.Liu at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>; Kuehling, Felix <Felix.Kuehling at amd.com>; Tao, Yintian <Yintian.Tao at amd.com>
Cc: amd-gfx at lists.freedesktop.org
Subject: Re: [PATCH] drm/amdgpu: refine kiq read register
Hi Monk,
yeah, that is certainly problematic. But we have some maximum size for the KIQ submission, don't we?
The only alternative would be to double check the rptr before we allocate space on the ring buffer, but this means quite some additional overhead.
Regards,
Christian.
Am 20.04.20 um 10:36 schrieb Liu, Monk:
> No, that's not true
>
> The problem is not we submit commands on KIQ ring before the emiited
> ones are signaled , instead it is because we don't have a unified
> command submit size on KIQ
>
> e.g.:
>
> ---JOB1---JOB2---JOB3---JOB4--->>
> If job1 signaled and job 2/3/4 are running, by (your) design driver is
> allowed to put job5 on the position of job1. But there is chance that
> job5 take 100DW while job1 only occupy 50dw, thus the job2 will be
> overwritten by job5\
>
> By gpu scheduler we always have fixed size of commands so jo5 will not overwrite job 2.
>
> _____________________________________
> Monk Liu|GPU Virtualization Team |AMD
>
>
> -----Original Message-----
> From: Koenig, Christian <Christian.Koenig at amd.com>
> Sent: Monday, April 20, 2020 4:26 PM
> To: Liu, Monk <Monk.Liu at amd.com>; Kuehling, Felix
> <Felix.Kuehling at amd.com>; Tao, Yintian <Yintian.Tao at amd.com>
> Cc: amd-gfx at lists.freedesktop.org
> Subject: Re: [PATCH] drm/amdgpu: refine kiq read register
>
> That is actually only a problem because the KIQ uses polling waits.
>
> See amdgpu_fence_emit() waits for the oldest possible fence to be signaled before emitting a new one.
>
> I suggest that we do the same in amdgpu_fence_emit_polling(). A one liner like the following should be enough:
>
> amdgpu_fence_wait_polling(ring, seq - ring->fence_drv.num_fences_mask,
> timeout);
>
> Regards,
> Christian.
>
> Am 20.04.20 um 10:20 schrieb Liu, Monk:
>> Sure, that's fine
>>
>> Do you have particular suggestion for problem 2 ? how we avoid
>> commands being overwritten before it's finished
>>
>> _____________________________________
>> Monk Liu|GPU Virtualization Team |AMD
>>
>>
>> -----Original Message-----
>> From: Christian König <ckoenig.leichtzumerken at gmail.com>
>> Sent: Monday, April 20, 2020 4:17 PM
>> To: Liu, Monk <Monk.Liu at amd.com>; Koenig, Christian
>> <Christian.Koenig at amd.com>; Kuehling, Felix <Felix.Kuehling at amd.com>;
>> Tao, Yintian <Yintian.Tao at amd.com>
>> Cc: amd-gfx at lists.freedesktop.org
>> Subject: Re: [PATCH] drm/amdgpu: refine kiq read register
>>
>>> Yintian's patch has nothing to do with the result you mentioned .... the command being overwritten by new initiated commands is a inherent bug, why you put those two stuff together ?
>> Yintian patch made the situation absolutely worse. Instead of a whole ring buffer wrap around to overwrite things (1024 dw at least) you now just need to use up 30 dw to trigger undefined behavior and most likely a lockup.
>>
>> And as Felix pointed out the patch even writes over the end of the ring buffer and can cause random corruption to whatever there is.
>>
>>> What about let Yintian to provide one patch to address all those two problem ? so way what you worried about won't happen ?
>> Yes, please do so. But please make also sure that the original patch is reverted before this starts to cause fallout from testers.
>>
>> Regards,
>> Christian.
>>
>> Am 20.04.20 um 09:39 schrieb Liu, Monk:
>>>>>> Instead of this crude hack please let us just allocate a fixed
>>>>>> number of write back slots and use them round robin
>>> It looks doable but really ugly compared with current patch ... and
>>> more over there we are going to fix the second problem eventually
>>>
>>> What about let Yintian to provide one patch to address all those two problem ? so way what you worried about won't happen ?
>>> _____________________________________
>>> Monk Liu|GPU Virtualization Team |AMD
>>>
>>>
>>> -----Original Message-----
>>> From: Liu, Monk
>>> Sent: Monday, April 20, 2020 3:37 PM
>>> To: Koenig, Christian <Christian.Koenig at amd.com>; Kuehling, Felix
>>> <Felix.Kuehling at amd.com>; Tao, Yintian <Yintian.Tao at amd.com>
>>> Cc: amd-gfx at lists.freedesktop.org
>>> Subject: RE: [PATCH] drm/amdgpu: refine kiq read register
>>>
>>>>>> Previously we ended up with an invalid value in a concurrent register read, now the KIQs overwrites its own commands and most likely causes a hang or the hardware to execute something random.
>>> Yintian's patch has nothing to do with the result you mentioned .... the command being overwritten by new initiated commands is a inherent bug, why you put those two stuff together ?
>>>
>>>
>>>
>>> _____________________________________
>>> Monk Liu|GPU Virtualization Team |AMD
>>>
>>>
>>> -----Original Message-----
>>> From: Koenig, Christian <Christian.Koenig at amd.com>
>>> Sent: Monday, April 20, 2020 3:19 PM
>>> To: Liu, Monk <Monk.Liu at amd.com>; Kuehling, Felix
>>> <Felix.Kuehling at amd.com>; Tao, Yintian <Yintian.Tao at amd.com>
>>> Cc: amd-gfx at lists.freedesktop.org
>>> Subject: Re: [PATCH] drm/amdgpu: refine kiq read register
>>>
>>> Hi Monk,
>>>
>>>> Can we first get the first problem done ?
>>> Please absolutely not! See the problem introduced here is quite worse than the actual fix.
>>>
>>> Previously we ended up with an invalid value in a concurrent register read, now the KIQs overwrites its own commands and most likely causes a hang or the hardware to execute something random.
>>>
>>> Instead of this crude hack please let us just allocate a fixed number of write back slots and use them round robin. Then we can make sure that we don't have more than a fixed number of reads in flight at the same time as well using the fence values.
>>>
>>> This should fix both problems at the same time and not introduce another potential problematic hack.
>>>
>>> If this patch is already committed please revert it immediately.
>>>
>>> Regards,
>>> Christian.
>>>
>>> Am 20.04.20 um 08:20 schrieb Liu, Monk:
>>>> Christian
>>>>
>>>>>>> Well I was under the assumption that this is actually what is done here.
>>>> If that is not the case the patch is a rather clear NAK.
>>>> <<<
>>>>
>>>> There are two kinds of problems in the current KIQ reading reg, Yintian tend to fix one of them but not all ...
>>>>
>>>> The first problem is :
>>>> During the sleep of the first KIQ reading, another KIQ reading initiated an the read back register value flushed the first readback value, thus the first reading will get the wrong result.
>>>> This is the issue yintian's patch to address, by put the readback
>>>> value not in a shared WB but in a chunk DW of command submit
>>>>
>>>> The second problem is:
>>>> Since we don't utilize GPU scheduler for KIQ submit thus if the KIQ
>>>> is busy with some commands then those unfinished commands maybe overwritten by a new command submit, and that's not the Problem yintian's patch tend to address. Felex pointed it out which is fine and we can use another patch to address it, I'm also planning and scoping it.
>>>>
>>>> The optional way is:
>>>> 1) We use GPU scheduler to manage KIQ activity, and all jobs are
>>>> submitted to KIQ through a IB, thus no overwritten will happen
>>>> 2) we still skip gpu scheduler but always use IB to put jobs on
>>>> KIQ, thus each JOB will occupy the fixed space/DW of RB, so we can
>>>> avoid overwrite unfinished command
>>>>
>>>> We can discuss the second problem later
>>>>
>>>> Can we first get the first problem done ? thanks
>>>>
>>>>
>>>> _____________________________________
>>>> Monk Liu|GPU Virtualization Team |AMD
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: Christian König <ckoenig.leichtzumerken at gmail.com>
>>>> Sent: Monday, April 20, 2020 1:03 AM
>>>> To: Kuehling, Felix <Felix.Kuehling at amd.com>; Tao, Yintian
>>>> <Yintian.Tao at amd.com>; Liu, Monk <Monk.Liu at amd.com>
>>>> Cc: amd-gfx at lists.freedesktop.org
>>>> Subject: Re: [PATCH] drm/amdgpu: refine kiq read register
>>>>
>>>> Am 17.04.20 um 17:39 schrieb Felix Kuehling:
>>>>> Am 2020-04-17 um 2:53 a.m. schrieb Yintian Tao:
>>>>>> According to the current kiq read register method, there will be
>>>>>> race condition when using KIQ to read register if multiple
>>>>>> clients want to read at same time just like the expample below:
>>>>>> 1. client-A start to read REG-0 throguh KIQ 2. client-A poll the
>>>>>> seqno-0 3. client-B start to read REG-1 through KIQ 4. client-B
>>>>>> poll the seqno-1 5. the kiq complete these two read operation 6.
>>>>>> client-A to read the register at the wb buffer and
>>>>>> get REG-1 value
>>>>>>
>>>>>> Therefore, directly make kiq write the register value at the ring
>>>>>> buffer then there will be no race condition for the wb buffer.
>>>>>>
>>>>>> v2: supply the read_clock and move the reg_val_offs back
>>>>>>
>>>>>> Signed-off-by: Yintian Tao <yttao at amd.com>
>>>>>> ---
>>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 11 ++++------
>>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h | 1 -
>>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h | 5 +++--
>>>>>> drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c | 14 +++++-------
>>>>>> drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 14 +++++-------
>>>>>> drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 28 ++++++++++++------------
>>>>>> 6 files changed, 33 insertions(+), 40 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
>>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
>>>>>> index ea576b4260a4..4e1c0239e561 100644
>>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
>>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
>>>>>> @@ -304,10 +304,6 @@ int amdgpu_gfx_kiq_init_ring(struct
>>>>>> amdgpu_device *adev,
>>>>>>
>>>>>> spin_lock_init(&kiq->ring_lock);
>>>>>>
>>>>>> - r = amdgpu_device_wb_get(adev, &kiq->reg_val_offs);
>>>>>> - if (r)
>>>>>> - return r;
>>>>>> -
>>>>>> ring->adev = NULL;
>>>>>> ring->ring_obj = NULL;
>>>>>> ring->use_doorbell = true; @@ -331,7 +327,6 @@ int
>>>>>> amdgpu_gfx_kiq_init_ring(struct amdgpu_device *adev,
>>>>>>
>>>>>> void amdgpu_gfx_kiq_free_ring(struct amdgpu_ring *ring)
>>>>>> {
>>>>>> - amdgpu_device_wb_free(ring->adev, ring->adev->gfx.kiq.reg_val_offs);
>>>>>> amdgpu_ring_fini(ring);
>>>>>> }
>>>>>>
>>>>>> @@ -675,12 +670,14 @@ uint32_t amdgpu_kiq_rreg(struct amdgpu_device *adev, uint32_t reg)
>>>>>> uint32_t seq;
>>>>>> struct amdgpu_kiq *kiq = &adev->gfx.kiq;
>>>>>> struct amdgpu_ring *ring = &kiq->ring;
>>>>>> + uint64_t reg_val_offs = 0;
>>>>>>
>>>>>> BUG_ON(!ring->funcs->emit_rreg);
>>>>>>
>>>>>> spin_lock_irqsave(&kiq->ring_lock, flags);
>>>>>> amdgpu_ring_alloc(ring, 32);
>>>>>> - amdgpu_ring_emit_rreg(ring, reg);
>>>>>> + reg_val_offs = (ring->wptr & ring->buf_mask) + 30;
>>>>> I think that should be (ring->wptr + 30) & ring->buf_mask.
>>>>> Otherwise the reg_val_offset can be past the end of the ring.
>>>>>
>>>>> But that still leaves a problem if another command is submitted to
>>>>> the KIQ before you read the returned reg_val from the ring. Your
>>>>> reg_val can be overwritten by the new command and you get the
>>>>> wrong result. Or the command can be overwritten with the reg_val,
>>>>> which will most likely hang the CP.
>>>>>
>>>>> You could allocate space on the KIQ ring with a NOP command to
>>>>> prevent that space from being overwritten by other commands.
>>>> Well I was under the assumption that this is actually what is done here.
>>>> If that is not the case the patch is a rather clear NAK.
>>>>
>>>> Regards,
>>>> Christian.
>>>>
>>>>> Regards,
>>>>> Felix
>>>>>
>>>>>
>>>>>> + amdgpu_ring_emit_rreg(ring, reg, reg_val_offs);
>>>>>> amdgpu_fence_emit_polling(ring, &seq);
>>>>>> amdgpu_ring_commit(ring);
>>>>>> spin_unlock_irqrestore(&kiq->ring_lock, flags); @@ -707,7
>>>>>> +704,7 @@ uint32_t amdgpu_kiq_rreg(struct amdgpu_device *adev,
>>>>>> +uint32_t reg)
>>>>>> if (cnt > MAX_KIQ_REG_TRY)
>>>>>> goto failed_kiq_read;
>>>>>>
>>>>>> - return adev->wb.wb[kiq->reg_val_offs];
>>>>>> + return ring->ring[reg_val_offs];
>>>>>>
>>>>>> failed_kiq_read:
>>>>>> pr_err("failed to read reg:%x\n", reg); diff --git
>>>>>> a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
>>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
>>>>>> index 634746829024..ee698f0246d8 100644
>>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
>>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
>>>>>> @@ -103,7 +103,6 @@ struct amdgpu_kiq {
>>>>>> struct amdgpu_ring ring;
>>>>>> struct amdgpu_irq_src irq;
>>>>>> const struct kiq_pm4_funcs *pmf;
>>>>>> - uint32_t reg_val_offs;
>>>>>> };
>>>>>>
>>>>>> /*
>>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
>>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
>>>>>> index f61664ee4940..a3d88f2aa9f4 100644
>>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
>>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
>>>>>> @@ -181,7 +181,8 @@ struct amdgpu_ring_funcs {
>>>>>> void (*end_use)(struct amdgpu_ring *ring);
>>>>>> void (*emit_switch_buffer) (struct amdgpu_ring *ring);
>>>>>> void (*emit_cntxcntl) (struct amdgpu_ring *ring, uint32_t flags);
>>>>>> - void (*emit_rreg)(struct amdgpu_ring *ring, uint32_t reg);
>>>>>> + void (*emit_rreg)(struct amdgpu_ring *ring, uint32_t reg,
>>>>>> + uint64_t reg_val_offs);
>>>>>> void (*emit_wreg)(struct amdgpu_ring *ring, uint32_t reg, uint32_t val);
>>>>>> void (*emit_reg_wait)(struct amdgpu_ring *ring, uint32_t reg,
>>>>>> uint32_t val, uint32_t mask); @@ -265,7 +266,7 @@
>>>>>> struct amdgpu_ring {
>>>>>> #define amdgpu_ring_emit_hdp_flush(r) (r)->funcs->emit_hdp_flush((r))
>>>>>> #define amdgpu_ring_emit_switch_buffer(r) (r)->funcs->emit_switch_buffer((r))
>>>>>> #define amdgpu_ring_emit_cntxcntl(r, d)
>>>>>> (r)->funcs->emit_cntxcntl((r), (d)) -#define
>>>>>> amdgpu_ring_emit_rreg(r,
>>>>>> d) (r)->funcs->emit_rreg((r), (d))
>>>>>> +#define amdgpu_ring_emit_rreg(r, d, o)
>>>>>> +(r)->funcs->emit_rreg((r), (d), (o))
>>>>>> #define amdgpu_ring_emit_wreg(r, d, v) (r)->funcs->emit_wreg((r), (d), (v))
>>>>>> #define amdgpu_ring_emit_reg_wait(r, d, v, m) (r)->funcs->emit_reg_wait((r), (d), (v), (m))
>>>>>> #define amdgpu_ring_emit_reg_write_reg_wait(r, d0, d1, v,
>>>>>> m) (r)->funcs->emit_reg_write_reg_wait((r), (d0), (d1), (v), (m))
>>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
>>>>>> b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
>>>>>> index 0a03e2ad5d95..7c9a5e440509 100644
>>>>>> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
>>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
>>>>>> @@ -7594,21 +7594,19 @@ static void gfx_v10_0_ring_emit_frame_cntl(struct amdgpu_ring *ring, bool start,
>>>>>> amdgpu_ring_write(ring, v | FRAME_CMD(start ? 0 : 1));
>>>>>> }
>>>>>>
>>>>>> -static void gfx_v10_0_ring_emit_rreg(struct amdgpu_ring *ring,
>>>>>> uint32_t reg)
>>>>>> +static void gfx_v10_0_ring_emit_rreg(struct amdgpu_ring *ring, uint32_t reg,
>>>>>> + uint64_t reg_val_offs)
>>>>>> {
>>>>>> - struct amdgpu_device *adev = ring->adev;
>>>>>> - struct amdgpu_kiq *kiq = &adev->gfx.kiq;
>>>>>> -
>>>>>> amdgpu_ring_write(ring, PACKET3(PACKET3_COPY_DATA, 4));
>>>>>> amdgpu_ring_write(ring, 0 | /* src: register*/
>>>>>> (5 << 8) | /* dst: memory */
>>>>>> (1 << 20)); /* write confirm */
>>>>>> amdgpu_ring_write(ring, reg);
>>>>>> amdgpu_ring_write(ring, 0);
>>>>>> - amdgpu_ring_write(ring, lower_32_bits(adev->wb.gpu_addr +
>>>>>> - kiq->reg_val_offs * 4));
>>>>>> - amdgpu_ring_write(ring, upper_32_bits(adev->wb.gpu_addr +
>>>>>> - kiq->reg_val_offs * 4));
>>>>>> + amdgpu_ring_write(ring, lower_32_bits(ring->gpu_addr +
>>>>>> + reg_val_offs * 4));
>>>>>> + amdgpu_ring_write(ring, upper_32_bits(ring->gpu_addr +
>>>>>> + reg_val_offs * 4));
>>>>>> }
>>>>>>
>>>>>> static void gfx_v10_0_ring_emit_wreg(struct amdgpu_ring
>>>>>> *ring, uint32_t reg, diff --git
>>>>>> a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
>>>>>> b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
>>>>>> index fc6c2f2bc76c..8e7eee7838e0 100644
>>>>>> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
>>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
>>>>>> @@ -6383,21 +6383,19 @@ static void gfx_v8_0_ring_emit_patch_cond_exec(struct amdgpu_ring *ring, unsigne
>>>>>> ring->ring[offset] = (ring->ring_size >> 2) - offset + cur;
>>>>>> }
>>>>>>
>>>>>> -static void gfx_v8_0_ring_emit_rreg(struct amdgpu_ring *ring,
>>>>>> uint32_t reg)
>>>>>> +static void gfx_v8_0_ring_emit_rreg(struct amdgpu_ring *ring, uint32_t reg,
>>>>>> + uint64_t reg_val_offs)
>>>>>> {
>>>>>> - struct amdgpu_device *adev = ring->adev;
>>>>>> - struct amdgpu_kiq *kiq = &adev->gfx.kiq;
>>>>>> -
>>>>>> amdgpu_ring_write(ring, PACKET3(PACKET3_COPY_DATA, 4));
>>>>>> amdgpu_ring_write(ring, 0 | /* src: register*/
>>>>>> (5 << 8) | /* dst: memory */
>>>>>> (1 << 20)); /* write confirm */
>>>>>> amdgpu_ring_write(ring, reg);
>>>>>> amdgpu_ring_write(ring, 0);
>>>>>> - amdgpu_ring_write(ring, lower_32_bits(adev->wb.gpu_addr +
>>>>>> - kiq->reg_val_offs * 4));
>>>>>> - amdgpu_ring_write(ring, upper_32_bits(adev->wb.gpu_addr +
>>>>>> - kiq->reg_val_offs * 4));
>>>>>> + amdgpu_ring_write(ring, lower_32_bits(ring->gpu_addr +
>>>>>> + reg_val_offs * 4));
>>>>>> + amdgpu_ring_write(ring, upper_32_bits(ring->gpu_addr +
>>>>>> + reg_val_offs * 4));
>>>>>> }
>>>>>>
>>>>>> static void gfx_v8_0_ring_emit_wreg(struct amdgpu_ring
>>>>>> *ring, uint32_t reg, diff --git
>>>>>> a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
>>>>>> b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
>>>>>> index 84fcf842316d..ff279b1f5c24 100644
>>>>>> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
>>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
>>>>>> @@ -4046,11 +4046,13 @@ static uint64_t gfx_v9_0_kiq_read_clock(struct amdgpu_device *adev)
>>>>>> uint32_t seq;
>>>>>> struct amdgpu_kiq *kiq = &adev->gfx.kiq;
>>>>>> struct amdgpu_ring *ring = &kiq->ring;
>>>>>> + uint64_t reg_val_offs = 0;
>>>>>>
>>>>>> BUG_ON(!ring->funcs->emit_rreg);
>>>>>>
>>>>>> spin_lock_irqsave(&kiq->ring_lock, flags);
>>>>>> amdgpu_ring_alloc(ring, 32);
>>>>>> + reg_val_offs = (ring->wptr & ring->buf_mask) + 30;
>>>>>> amdgpu_ring_write(ring, PACKET3(PACKET3_COPY_DATA, 4));
>>>>>> amdgpu_ring_write(ring, 9 | /* src: register*/
>>>>>> (5 << 8) | /* dst: memory */
>>>>>> @@ -4058,10 +4060,10 @@ static uint64_t gfx_v9_0_kiq_read_clock(struct amdgpu_device *adev)
>>>>>> (1 << 20)); /* write confirm */
>>>>>> amdgpu_ring_write(ring, 0);
>>>>>> amdgpu_ring_write(ring, 0);
>>>>>> - amdgpu_ring_write(ring, lower_32_bits(adev->wb.gpu_addr +
>>>>>> - kiq->reg_val_offs * 4));
>>>>>> - amdgpu_ring_write(ring, upper_32_bits(adev->wb.gpu_addr +
>>>>>> - kiq->reg_val_offs * 4));
>>>>>> + amdgpu_ring_write(ring, lower_32_bits(ring->gpu_addr +
>>>>>> + reg_val_offs * 4));
>>>>>> + amdgpu_ring_write(ring, upper_32_bits(ring->gpu_addr +
>>>>>> + reg_val_offs * 4));
>>>>>> amdgpu_fence_emit_polling(ring, &seq);
>>>>>> amdgpu_ring_commit(ring);
>>>>>> spin_unlock_irqrestore(&kiq->ring_lock, flags); @@ -4088,8
>>>>>> +4090,8 @@ static uint64_t gfx_v9_0_kiq_read_clock(struct
>>>>>> +amdgpu_device *adev)
>>>>>> if (cnt > MAX_KIQ_REG_TRY)
>>>>>> goto failed_kiq_read;
>>>>>>
>>>>>> - return (uint64_t)adev->wb.wb[kiq->reg_val_offs] |
>>>>>> - (uint64_t)adev->wb.wb[kiq->reg_val_offs + 1 ] << 32ULL;
>>>>>> + return (uint64_t)ring->ring[reg_val_offs] |
>>>>>> + (uint64_t)ring->ring[reg_val_offs + 1 ] << 32ULL;
>>>>>>
>>>>>> failed_kiq_read:
>>>>>> pr_err("failed to read gpu clock\n"); @@ -5482,21 +5484,19
>>>>>> @@ static void gfx_v9_0_ring_emit_patch_cond_exec(struct amdgpu_ring *ring, unsigne
>>>>>> ring->ring[offset] = (ring->ring_size>>2) - offset + cur;
>>>>>> }
>>>>>>
>>>>>> -static void gfx_v9_0_ring_emit_rreg(struct amdgpu_ring *ring,
>>>>>> uint32_t reg)
>>>>>> +static void gfx_v9_0_ring_emit_rreg(struct amdgpu_ring *ring, uint32_t reg,
>>>>>> + uint64_t reg_val_offs)
>>>>>> {
>>>>>> - struct amdgpu_device *adev = ring->adev;
>>>>>> - struct amdgpu_kiq *kiq = &adev->gfx.kiq;
>>>>>> -
>>>>>> amdgpu_ring_write(ring, PACKET3(PACKET3_COPY_DATA, 4));
>>>>>> amdgpu_ring_write(ring, 0 | /* src: register*/
>>>>>> (5 << 8) | /* dst: memory */
>>>>>> (1 << 20)); /* write confirm */
>>>>>> amdgpu_ring_write(ring, reg);
>>>>>> amdgpu_ring_write(ring, 0);
>>>>>> - amdgpu_ring_write(ring, lower_32_bits(adev->wb.gpu_addr +
>>>>>> - kiq->reg_val_offs * 4));
>>>>>> - amdgpu_ring_write(ring, upper_32_bits(adev->wb.gpu_addr +
>>>>>> - kiq->reg_val_offs * 4));
>>>>>> + amdgpu_ring_write(ring, lower_32_bits(ring->gpu_addr +
>>>>>> + reg_val_offs * 4));
>>>>>> + amdgpu_ring_write(ring, upper_32_bits(ring->gpu_addr +
>>>>>> + reg_val_offs * 4));
>>>>>> }
>>>>>>
>>>>>> static void gfx_v9_0_ring_emit_wreg(struct amdgpu_ring
>>>>>> *ring, uint32_t reg,
>>>>> _______________________________________________
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