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Date: Wed, 15 Mar 2017 16:12:35 +0530
From: Ayyappa Ch <ayyappa.ch.linux@...il.com>
To: Christian König <deathsimple@...afone.de>
Cc: helgaas@...nel.org, linux-pci@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
platform-driver-x86@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] drm/amdgpu: resize VRAM BAR for CPU access
It also needs any support from VBIOS side ? I mean PCIe large bar support?
Thanks,
Ayyappa.
On Wed, Mar 15, 2017 at 1:07 PM, Christian König
<deathsimple@...afone.de> wrote:
> Carizzo is an APU and resizing BARs isn't needed nor supported there. The
> CPU can access the full stolen VRAM directly on that hardware.
>
> As far as I know ASICs with support for this are Tonga, Fiji and all Polaris
> variants.
>
> Christian.
>
>
> Am 15.03.2017 um 08:23 schrieb Ayyappa Ch:
>>
>> Is it possible on Carrizo asics? Or only supports on newer asics?
>>
>> On Mon, Mar 13, 2017 at 6:11 PM, Christian König
>> <deathsimple@...afone.de> wrote:
>>>
>>> From: Christian König <christian.koenig@....com>
>>>
>>> Try to resize BAR0 to let CPU access all of VRAM.
>>>
>>> Signed-off-by: Christian König <christian.koenig@....com>
>>> ---
>>> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 29
>>> +++++++++++++++++++++++++++++
>>> drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 8 +++++---
>>> drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 8 +++++---
>>> 4 files changed, 40 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> index 3b81ded..905ded9 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> @@ -1719,6 +1719,7 @@ uint64_t amdgpu_ttm_tt_pte_flags(struct
>>> amdgpu_device *adev, struct ttm_tt *ttm,
>>> struct ttm_mem_reg *mem);
>>> void amdgpu_vram_location(struct amdgpu_device *adev, struct amdgpu_mc
>>> *mc, u64 base);
>>> void amdgpu_gtt_location(struct amdgpu_device *adev, struct amdgpu_mc
>>> *mc);
>>> +void amdgpu_resize_bar0(struct amdgpu_device *adev);
>>> void amdgpu_ttm_set_active_vram_size(struct amdgpu_device *adev, u64
>>> size);
>>> int amdgpu_ttm_init(struct amdgpu_device *adev);
>>> void amdgpu_ttm_fini(struct amdgpu_device *adev);
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> index 118f4e6..92955fe 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> @@ -692,6 +692,35 @@ void amdgpu_gtt_location(struct amdgpu_device *adev,
>>> struct amdgpu_mc *mc)
>>> mc->gtt_size >> 20, mc->gtt_start, mc->gtt_end);
>>> }
>>>
>>> +/**
>>> + * amdgpu_resize_bar0 - try to resize BAR0
>>> + *
>>> + * @adev: amdgpu_device pointer
>>> + *
>>> + * Try to resize BAR0 to make all VRAM CPU accessible.
>>> + */
>>> +void amdgpu_resize_bar0(struct amdgpu_device *adev)
>>> +{
>>> + u32 size = max(ilog2(adev->mc.real_vram_size - 1) + 1, 20) - 20;
>>> + int r;
>>> +
>>> + r = pci_resize_resource(adev->pdev, 0, size);
>>> +
>>> + if (r == -ENOTSUPP) {
>>> + /* The hardware don't support the extension. */
>>> + return;
>>> +
>>> + } else if (r == -ENOSPC) {
>>> + DRM_INFO("Not enoigh PCI address space for a large
>>> BAR.");
>>> + } else if (r) {
>>> + DRM_ERROR("Problem resizing BAR0 (%d).", r);
>>> + }
>>> +
>>> + /* Reinit the doorbell mapping, it is most likely moved as well
>>> */
>>> + amdgpu_doorbell_fini(adev);
>>> + BUG_ON(amdgpu_doorbell_init(adev));
>>> +}
>>> +
>>> /*
>>> * GPU helpers function.
>>> */
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
>>> b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
>>> index dc9b6d6..36a7aa5 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
>>> @@ -367,13 +367,15 @@ static int gmc_v7_0_mc_init(struct amdgpu_device
>>> *adev)
>>> break;
>>> }
>>> adev->mc.vram_width = numchan * chansize;
>>> - /* Could aper size report 0 ? */
>>> - adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
>>> - adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
>>> /* size in MB on si */
>>> adev->mc.mc_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL *
>>> 1024ULL;
>>> adev->mc.real_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL *
>>> 1024ULL;
>>>
>>> + if (!(adev->flags & AMD_IS_APU))
>>> + amdgpu_resize_bar0(adev);
>>> + adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
>>> + adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
>>> +
>>> #ifdef CONFIG_X86_64
>>> if (adev->flags & AMD_IS_APU) {
>>> adev->mc.aper_base = ((u64)RREG32(mmMC_VM_FB_OFFSET)) <<
>>> 22;
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
>>> b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
>>> index c087b00..7761ad3 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
>>> @@ -459,13 +459,15 @@ static int gmc_v8_0_mc_init(struct amdgpu_device
>>> *adev)
>>> break;
>>> }
>>> adev->mc.vram_width = numchan * chansize;
>>> - /* Could aper size report 0 ? */
>>> - adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
>>> - adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
>>> /* size in MB on si */
>>> adev->mc.mc_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL *
>>> 1024ULL;
>>> adev->mc.real_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL *
>>> 1024ULL;
>>>
>>> + if (!(adev->flags & AMD_IS_APU))
>>> + amdgpu_resize_bar0(adev);
>>> + adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
>>> + adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
>>> +
>>> #ifdef CONFIG_X86_64
>>> if (adev->flags & AMD_IS_APU) {
>>> adev->mc.aper_base = ((u64)RREG32(mmMC_VM_FB_OFFSET)) <<
>>> 22;
>>> --
>>> 2.7.4
>>>
>>> _______________________________________________
>>> dri-devel mailing list
>>> dri-devel@...ts.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>
>
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