Ok that sounds like a rather simple bug. I will try to take a look.
Thanks,
Christian.
Am 17.05.22 um 02:12 schrieb Marek Olšák:
Dmesg doesn't contain anything. There is no backtrace because it's not
a crash. The VA map ioctl just fails with the new flag. It looks like
the flag is considered invalid.
Marek
On Mon., May 16, 2022, 12:13 Christian König,
<ckoenig.leichtzumer...@gmail.com> wrote:
I don't have access to any gfx10 hardware.
Can you give me a dmesg and/or backtrace, etc..?
I can't push this unless it's working properly.
Christian.
Am 16.05.22 um 14:56 schrieb Marek Olšák:
Reproduction steps:
- use mesa/main on gfx10.3 (not sure what other GPUs do)
- run: radeonsi_mall_noalloc=true glxgears
Marek
On Mon, May 16, 2022 at 7:53 AM Christian König
<ckoenig.leichtzumer...@gmail.com> wrote:
Crap, do you have a link to the failure?
Am 16.05.22 um 13:10 schrieb Marek Olšák:
I forgot to say: The NOALLOC flag causes an allocation
failure, so there is a kernel bug somewhere.
Marek
On Mon, May 16, 2022 at 7:06 AM Marek Olšák
<mar...@gmail.com> wrote:
FYI, I think it's time to merge this because the Mesa
commits are going to be merged in ~30 minutes if Gitlab
CI is green, and that includes updated amdgpu_drm.h.
Marek
On Wed, May 11, 2022 at 2:55 PM Marek Olšák
<mar...@gmail.com> wrote:
Ok sounds good.
Marek
On Wed., May 11, 2022, 03:43 Christian König,
<ckoenig.leichtzumer...@gmail.com> wrote:
It really *is* a NOALLOC feature. In other words
there is no latency improvement on reads because
the cache is always checked, even with the
noalloc flag set.
The only thing it affects is that misses not
enter the cache and so don't cause any
additional pressure on evicting cache lines.
You might want to double check with the hardware
guys, but I'm something like 95% sure that it
works this way.
Christian.
Am 11.05.22 um 09:22 schrieb Marek Olšák:
Bypass means that the contents of the cache are
ignored, which decreases latency at the cost of
no coherency between bypassed and normal memory
requests. NOA (noalloc) means that the cache is
checked and can give you cache hits, but misses
are not cached and the overall latency is
higher. I don't know what the hw does, but I
hope it was misnamed and it really means bypass
because there is no point in doing cache
lookups on every memory request if the driver
wants to disable caching to *decrease* latency
in the situations when the cache isn't helping.
Marek
On Wed, May 11, 2022 at 2:15 AM Lazar, Lijo
<lijo.la...@amd.com> wrote:
On 5/11/2022 11:36 AM, Christian König wrote:
> Mhm, it doesn't really bypass MALL. It
just doesn't allocate any MALL
> entries on write.
>
> How about AMDGPU_VM_PAGE_NO_MALL ?
One more - AMDGPU_VM_PAGE_LLC_* [ LLC =
last level cache, * = some sort
of attribute which decides LLC behaviour]
Thanks,
Lijo
>
> Christian.
>
> Am 10.05.22 um 23:21 schrieb Marek Olšák:
>> A better name would be:
>> AMDGPU_VM_PAGE_BYPASS_MALL
>>
>> Marek
>>
>> On Fri, May 6, 2022 at 7:23 AM Christian
König
>> <ckoenig.leichtzumer...@gmail.com> wrote:
>>
>> Add the AMDGPU_VM_NOALLOC flag to
let userspace control MALL
>> allocation.
>>
>> Only compile tested!
>>
>> Signed-off-by: Christian König
<christian.koe...@amd.com>
>> ---
>>
drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c |
2 ++
>> drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
| 3 +++
>> drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
| 3 +++
>> include/uapi/drm/amdgpu_drm.h
| 2 ++
>> 4 files changed, 10 insertions(+)
>>
>> diff --git
a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
>> index bf97d8f07f57..d8129626581f 100644
>> ---
a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
>> +++
b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
>> @@ -650,6 +650,8 @@ uint64_t
amdgpu_gem_va_map_flags(struct
>> amdgpu_device *adev, uint32_t flags)
>> pte_flag |= AMDGPU_PTE_WRITEABLE;
>> if (flags & AMDGPU_VM_PAGE_PRT)
>> pte_flag |= AMDGPU_PTE_PRT;
>> + if (flags &
AMDGPU_VM_PAGE_NOALLOC)
>> + pte_flag |= AMDGPU_PTE_NOALLOC;
>>
>> if
(adev->gmc.gmc_funcs->map_mtype)
>> pte_flag |= amdgpu_gmc_map_mtype(adev,
>> diff --git
a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
>> b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
>> index b8c79789e1e4..9077dfccaf3c 100644
>> ---
a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
>> +++
b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
>> @@ -613,6 +613,9 @@ static void
gmc_v10_0_get_vm_pte(struct
>> amdgpu_device *adev,
>> *flags &= ~AMDGPU_PTE_MTYPE_NV10_MASK;
>> *flags |= (mapping->flags &
AMDGPU_PTE_MTYPE_NV10_MASK);
>>
>> + *flags &= ~AMDGPU_PTE_NOALLOC;
>> + *flags |= (mapping->flags &
AMDGPU_PTE_NOALLOC);
>> +
>> if (mapping->flags &
AMDGPU_PTE_PRT) {
>> *flags |= AMDGPU_PTE_PRT;
>> *flags |= AMDGPU_PTE_SNOOPED;
>> diff --git
a/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
>> b/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
>> index 8d733eeac556..32ee56adb602 100644
>> ---
a/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
>> +++
b/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
>> @@ -508,6 +508,9 @@ static void
gmc_v11_0_get_vm_pte(struct
>> amdgpu_device *adev,
>> *flags &= ~AMDGPU_PTE_MTYPE_NV10_MASK;
>> *flags |= (mapping->flags &
AMDGPU_PTE_MTYPE_NV10_MASK);
>>
>> + *flags &= ~AMDGPU_PTE_NOALLOC;
>> + *flags |= (mapping->flags &
AMDGPU_PTE_NOALLOC);
>> +
>> if (mapping->flags &
AMDGPU_PTE_PRT) {
>> *flags |= AMDGPU_PTE_PRT;
>> *flags |= AMDGPU_PTE_SNOOPED;
>> diff --git
a/include/uapi/drm/amdgpu_drm.h
>> b/include/uapi/drm/amdgpu_drm.h
>> index 57b9d8f0133a..9d71d6330687 100644
>> --- a/include/uapi/drm/amdgpu_drm.h
>> +++ b/include/uapi/drm/amdgpu_drm.h
>> @@ -533,6 +533,8 @@ struct
drm_amdgpu_gem_op {
>> #define AMDGPU_VM_MTYPE_UC (4
<< 5)
>> /* Use Read Write MTYPE instead of
default MTYPE */
>> #define AMDGPU_VM_MTYPE_RW (5
<< 5)
>> +/* don't allocate MALL */
>> +#define AMDGPU_VM_PAGE_NOALLOC
(1 << 9)
>>
>> struct drm_amdgpu_gem_va {
>> /** GEM object handle */
>> --
>> 2.25.1
>>
>