[PATCH] drm/amdgpu: fix modprobe failure of the 2nd GPU when GDDR6 training enabled
Yin, Tianci (Rico)
Tianci.Yin at amd.com
Thu Jan 9 03:15:39 UTC 2020
[AMD Official Use Only - Internal Distribution Only]
Ok, thanks very much Alex!
________________________________
From: Alex Deucher <alexdeucher at gmail.com>
Sent: Thursday, January 9, 2020 11:12
To: Yin, Tianci (Rico) <Tianci.Yin at amd.com>
Cc: Christian König <ckoenig.leichtzumerken at gmail.com>; Koenig, Christian <Christian.Koenig at amd.com>; Long, Gang <Gang.Long at amd.com>; Wang, Kevin(Yang) <Kevin1.Wang at amd.com>; Xu, Feifei <Feifei.Xu at amd.com>; amd-gfx list <amd-gfx at lists.freedesktop.org>; Tuikov, Luben <Luben.Tuikov at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; Yuan, Xiaojie <Xiaojie.Yuan at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>
Subject: Re: [PATCH] drm/amdgpu: fix modprobe failure of the 2nd GPU when GDDR6 training enabled
On Wed, Jan 8, 2020 at 10:07 PM Yin, Tianci (Rico) <Tianci.Yin at amd.com> wrote:
>
> [AMD Official Use Only - Internal Distribution Only]
>
>
> Thanks Alex and Christian!
>
> Hi Christian,
>
> On ASICs with gmc v10, I find amdgpu_bo_late_init() is not invoked, so stolen memory never get free, on other ASICs with gmc v9/v8/v7/v6, stolen memory was freed in gmc_v*_0_late_init(). I don't know why, are there some special reasons or just missed by coding?
>
Looks like it should be added. Possibly got lost when we merged the
navi code from the topic branch.
Alex
> Thanks!
>
> Rico
>
> ________________________________
> From: Christian König <ckoenig.leichtzumerken at gmail.com>
> Sent: Wednesday, January 8, 2020 23:04
> To: Alex Deucher <alexdeucher at gmail.com>; Koenig, Christian <Christian.Koenig at amd.com>
> Cc: Long, Gang <Gang.Long at amd.com>; Wang, Kevin(Yang) <Kevin1.Wang at amd.com>; Xu, Feifei <Feifei.Xu at amd.com>; Yin, Tianci (Rico) <Tianci.Yin at amd.com>; amd-gfx list <amd-gfx at lists.freedesktop.org>; Tuikov, Luben <Luben.Tuikov at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; Yuan, Xiaojie <Xiaojie.Yuan at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>
> Subject: Re: [PATCH] drm/amdgpu: fix modprobe failure of the 2nd GPU when GDDR6 training enabled
>
> Am 08.01.20 um 15:49 schrieb Alex Deucher:
> > On Wed, Jan 8, 2020 at 7:52 AM Christian König <christian.koenig at amd.com> wrote:
> >> Am 08.01.20 um 13:36 schrieb Tianci Yin:
> >>> From: "Tianci.Yin" <tianci.yin at amd.com>
> >>>
> >>> [why]
> >>> In dual GPUs scenario, stolen_size is assigned to zero on the 2nd GPU,
> >>> then the bottom region of VRAM was allocated as GTT, unfortunately
> >>> a small region of bottom VRAM was encroached by UMC firmware during
> >>> GDDR6 BIST training, this cause pagefault.
> >> What I'm missing here is why is the stolen size zero on the 2nd GPU?
> >>
> >> Maybe we need to read the stolen size after posting the GPU instead?
> > There is no stolen memory on secondary GPUs because there is no pre-OS
> > console using that memory.
>
> Ah! Yeah that makes sense.
>
> But in this case I would say we should change the patch like the following:
>
> adev->gmc.stolen_size = min(adev->gmc.stolen_size,
> AMDGPU_STOLEN_VGA_DEFAULT_SIZE);
>
> And in amdgpu_ttm_late_init():
>
> /* Can't free the stolen VGA memory when it might be used for memory
> training again. */
> if (!adev->fw_vram_usage.mem_train_support)
> amdgpu_bo_free_kernel(....
>
>
> Regards,
> Christian.
>
>
> >
> > Alex
> >
> >> Regards,
> >> Christian.
> >>
> >>> [how]
> >>> Forcing stolen_size to 3MB, then the bottom region of VRAM was
> >>> allocated as stolen memory, GTT corruption avoid.
> >>> The stolen memory of the 2nd GPU will be free in late_init phase,
> >>> no memory wasted.
> >>>
> >>> Change-Id: Icd0ad7de41333282949bb1e3e676c6c307ddd081
> >>> Signed-off-by: Tianci.Yin <tianci.yin at amd.com>
> >>> ---
> >>> drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h | 6 ++++++
> >>> drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c | 21 +++++++++++++++++++++
> >>> 2 files changed, 27 insertions(+)
> >>>
> >>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
> >>> index c91dd602d5f1..440b793316df 100644
> >>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
> >>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
> >>> @@ -60,6 +60,11 @@
> >>> */
> >>> #define AMDGPU_GMC_FAULT_TIMEOUT 5000ULL
> >>>
> >>> +/*
> >>> + * Default stolen memory size, 1024 * 768 * 4
> >>> + */
> >>> +#define AMDGPU_STOLEN_VGA_DEFAULT_SIZE 0x300000
> >>> +
> >>> struct firmware;
> >>>
> >>> /*
> >>> @@ -192,6 +197,7 @@ struct amdgpu_gmc {
> >>> uint32_t srbm_soft_reset;
> >>> bool prt_warning;
> >>> uint64_t stolen_size;
> >>> + bool stolen_temp_reserved;
> >>> /* apertures */
> >>> u64 shared_aperture_start;
> >>> u64 shared_aperture_end;
> >>> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
> >>> index 7dc8c068c62a..0c96b67d6ca7 100644
> >>> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
> >>> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
> >>> @@ -566,6 +566,11 @@ static int gmc_v10_0_late_init(void *handle)
> >>> struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> >>> int r;
> >>>
> >>> + if (adev->gmc.stolen_temp_reserved) {
> >>> + amdgpu_bo_late_init(adev);
> >>> + adev->gmc.stolen_temp_reserved = false;
> >>> + }
> >>> +
> >>> r = amdgpu_gmc_allocate_vm_inv_eng(adev);
> >>> if (r)
> >>> return r;
> >>> @@ -756,6 +761,22 @@ static int gmc_v10_0_sw_init(void *handle)
> >>> return r;
> >>>
> >>> adev->gmc.stolen_size = gmc_v10_0_get_vbios_fb_size(adev);
> >>> + /*
> >>> + * In dual GPUs scenario, stolen_size is assigned to zero on the 2nd GPU,
> >>> + * then the bottom region of VRAM was allocated as GTT, unfortunately
> >>> + * a small region of bottom VRAM was encroached by UMC firmware during
> >>> + * GDDR6 BIST training, this cause pagefault.
> >>> + * The page fault can be fixed by forcing stolen_size to 3MB, then the bottom
> >>> + * region of VRAM was allocated as stolen memory, GTT corruption avoid.
> >>> + * The stolen memory of the 2nd GPU will be free in late_init phase,
> >>> + * no memory wasted.
> >>> + */
> >>> + if (adev->fw_vram_usage.mem_train_support &&
> >>> + adev->gmc.stolen_size == 0) {
> >>> + adev->gmc.stolen_size = AMDGPU_STOLEN_VGA_DEFAULT_SIZE;
> >>> + adev->gmc.stolen_temp_reserved = true;
> >>> + } else
> >>> + adev->gmc.stolen_temp_reserved = false;
> >>>
> >>> /* Memory manager */
> >>> r = amdgpu_bo_init(adev);
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