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([2a02:908:1252:fb60:c3ab:ee01:d547:2c4e]) by smtp.gmail.com with ESMTPSA id w6sm8003653edc.25.2021.05.10.23.56.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 May 2021 23:56:01 -0700 (PDT) Subject: Re: [PATCH v6 16/16] drm/amdgpu: Verify DMA opearations from device are done To: Andrey Grodzovsky , dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, linux-pci@vger.kernel.org, daniel.vetter@ffwll.ch, Harry.Wentland@amd.com Cc: ppaalanen@gmail.com, Alexander.Deucher@amd.com, gregkh@linuxfoundation.org, helgaas@kernel.org, Felix.Kuehling@amd.com References: <20210510163625.407105-1-andrey.grodzovsky@amd.com> <20210510163625.407105-17-andrey.grodzovsky@amd.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <2660cf0e-d312-787d-3100-8e1006d8cc35@gmail.com> Date: Tue, 11 May 2021 08:56:00 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210510163625.407105-17-andrey.grodzovsky@amd.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Am 10.05.21 um 18:36 schrieb Andrey Grodzovsky: > In case device remove is just simualted by sysfs then verify > device doesn't keep doing DMA to the released memory after > pci_remove is done. > > Signed-off-by: Andrey Grodzovsky Acked-by: Christian König > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c > index 83006f45b10b..5e6af9e0b7bf 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c > @@ -1314,7 +1314,13 @@ amdgpu_pci_remove(struct pci_dev *pdev) > drm_dev_unplug(dev); > amdgpu_driver_unload_kms(dev); > > + /* > + * Flush any in flight DMA operations from device. > + * Clear the Bus Master Enable bit and then wait on the PCIe Device > + * StatusTransactions Pending bit. > + */ > pci_disable_device(pdev); > + pci_wait_for_pending_transaction(pdev); > } > > static void