> -----Original Message----- > From: dri-devel [mailto:dri-devel-bounces at lists.freedesktop.org] On Behalf Of > Christian K?nig > Sent: Wednesday, March 15, 2017 17:29 > To: Zhou, David(ChunMing); Ayyappa Ch > Cc: linux-pci at vger.kernel.org; linux-kernel at vger.kernel.org; amd- > gfx at lists.freedesktop.org; platform-driver-x86 at vger.kernel.org; > helgaas at kernel.org; dri-devel at lists.freedesktop.org > Subject: Re: [PATCH 4/4] drm/amdgpu: resize VRAM BAR for CPU access > > Yes, exactly that. (I'm not familiar with PCI too much.) Is there any restrict for PCI device? I'm concerning if any PCI couldn't support it on some motherboard. > > Christian. > > Am 15.03.2017 um 09:25 schrieb Zhou, David(ChunMing): > > Does that means we don't need invisible vram later? > > > > David > > > > -----Original Message----- > > From: dri-devel [mailto:dri-devel-bounces at lists.freedesktop.org] On > > Behalf Of Christian K?nig > > Sent: Wednesday, March 15, 2017 3:38 PM > > To: Ayyappa Ch <ayyappa.ch.linux at gmail.com> > > Cc: linux-pci at vger.kernel.org; linux-kernel at vger.kernel.org; > > amd-gfx at lists.freedesktop.org; platform-driver-x86 at vger.kernel.org; > > helgaas at kernel.org; dri-devel at lists.freedesktop.org > > Subject: Re: [PATCH 4/4] drm/amdgpu: resize VRAM BAR for CPU access > > > > 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 at vodafone.de> wrote: > >>> From: Christian König <christian.koenig at amd.com> > >>> > >>> Try to resize BAR0 to let CPU access all of VRAM. > >>> > >>> Signed-off-by: Christian König <christian.koenig at amd.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 at lists.freedesktop.org > >>> https://lists.freedesktop.org/mailman/listinfo/dri-devel > > > > _______________________________________________ > > dri-devel mailing list > > dri-devel at lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/dri-devel > > _______________________________________________ > > amd-gfx mailing list > > amd-gfx at lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/amd-gfx > > > _______________________________________________ > dri-devel mailing list > dri-devel at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
