Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1429771AbdDYNUX (ORCPT ); Tue, 25 Apr 2017 09:20:23 -0400 Received: from pegasos-out.vodafone.de ([80.84.1.38]:56985 "EHLO pegasos-out.vodafone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1430717AbdDYNUM (ORCPT ); Tue, 25 Apr 2017 09:20:12 -0400 X-Spam-Flag: NO X-Spam-Score: -0.044 Authentication-Results: rohrpostix1.prod.vfnet.de (amavisd-new); dkim=pass header.i=@vodafone.de X-DKIM: OpenDKIM Filter v2.6.8 pegasos-out.vodafone.de EB0A9261A60 From: =?UTF-8?q?Christian=20K=C3=B6nig?= To: helgaas@kernel.org, linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/4] drm/amdgpu: resize VRAM BAR for CPU access v2 Date: Tue, 25 Apr 2017 15:19:54 +0200 Message-Id: <1493126394-1239-5-git-send-email-deathsimple@vodafone.de> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1493126394-1239-1-git-send-email-deathsimple@vodafone.de> References: <1493126394-1239-1-git-send-email-deathsimple@vodafone.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5973 Lines: 151 From: Christian König Try to resize BAR0 to let CPU access all of VRAM. v2: rebased, style cleanups, disable mem decode before resize, handle gmc_v9 as well, round size up to power of two. Signed-off-by: Christian König --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 37 ++++++++++++++++++++++++++++++ drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 8 ++++--- drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 8 ++++--- drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 10 ++++---- 5 files changed, 54 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index 4a16e3c..9484062 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -1879,6 +1879,7 @@ 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 a09ad3cf..d5ca77a 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -695,6 +695,43 @@ 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) +{ + u64 space_needed = roundup_pow_of_two(adev->mc.real_vram_size); + u32 rbar_size = order_base_2(((space_needed >> 20) | 1)) -1; + u16 cmd; + int r; + + /* Free the doorbell mapping, it most likely needs to move as well */ + amdgpu_doorbell_fini(adev); + pci_release_resource(adev->pdev, 2); + + /* Disable memory decoding while we change the BAR addresses and size */ + pci_read_config_word(adev->pdev, PCI_COMMAND, &cmd); + pci_write_config_word(adev->pdev, PCI_COMMAND, + cmd & ~PCI_COMMAND_MEMORY); + + r = pci_resize_resource(adev->pdev, 0, rbar_size); + if (r == -ENOSPC) + DRM_INFO("Not enough PCI address space for a large BAR."); + else if (r && r != -ENOTSUPP) + DRM_ERROR("Problem resizing BAR0 (%d).", r); + + pci_write_config_word(adev->pdev, PCI_COMMAND, cmd); + + /* When the doorbell BAR isn't available we have no chance of + * using the device. + */ + 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 a9083a1..ae71524 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c @@ -372,13 +372,15 @@ static int gmc_v7_0_mc_init(struct amdgpu_device *adev) } 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 4ac9978..1655de2 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c @@ -534,13 +534,15 @@ static int gmc_v8_0_mc_init(struct amdgpu_device *adev) } 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_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c index e5d4dfe..4bbef79 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c @@ -469,16 +469,18 @@ static int gmc_v9_0_mc_init(struct amdgpu_device *adev) } 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 = nbio_v6_1_get_memsize(adev) * 1024ULL * 1024ULL; adev->mc.real_vram_size = adev->mc.mc_vram_size; - adev->mc.visible_vram_size = adev->mc.aper_size; + + 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); /* In case the PCI BAR is larger than the actual amount of vram */ + adev->mc.visible_vram_size = adev->mc.aper_size; if (adev->mc.visible_vram_size > adev->mc.real_vram_size) adev->mc.visible_vram_size = adev->mc.real_vram_size; -- 2.7.4