From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 00D197FBAA; Tue, 7 May 2024 22:57:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715122675; cv=none; b=c/ueVWNpmb5p6Dd35YgX9rfJDir5tfkKLqWU1CtIcuk+113E+jnujoe5gAdDe89hWAyHt8w3ckHC/7ZPXUQ+XJWVCqWYlJxXkdWSUzeeRSNRQRJFGiibjAY+tu2Q7z/p1ReNCRMHMaEUGVAZqAp/4YaM9EiYJrI04Bi0Bs4ZENE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715122675; c=relaxed/simple; bh=udNWqAkvlsLASnmTFzv403Ly/z9YdIt7N7LlhQs4C2Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OWuMKvbEP/96YTKwrbjhcedRTPTAfJ0eHCqsXjoe/mqKgK3AcTwktM1u7589G6UHXGYgPdBZj6PHtZomkNZ7m+R3MiYPnJQP0kPzg00clWkOYMtZ36EDoY+SSy6dwxABwgbrLO9Fq/c2l6ZIzPZ9UYT+Q1ODoybiRi9n/UXC+/g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AxbAwJUv; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AxbAwJUv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E1C27C3277B; Tue, 7 May 2024 22:57:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1715122674; bh=udNWqAkvlsLASnmTFzv403Ly/z9YdIt7N7LlhQs4C2Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AxbAwJUvTkBoW8QUHQPUrOKGKDbU7y5hLveb080WPQoxY1x8tO+ErUJ6BdSkuBaqT GkYX4Xgrfje7uEvtXJsCbeUCA1Ld8bPfDUqwqy3OrUqgxqwSWcifk0tcIfyOUJOrvC m1R/dFu/jv7jC9RB2vlKjNpE//y+LhdwwtFuEI0FlPKpcMl1bs7/S3IAoI3SDdeTPU B3VM7IUBm/3+NACSW2XBNODQ3d/2NlZmfpUm7Aa0hs/cKITFUQqHlcqVrlTVcjOmT5 dRqs+fwukKdDm4MVyelPohzV9AVHqNkkmj+YqfP8jOFp0V2RX/9q84ivII6ZTpyFns 8bbbM/kDBqrhA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lijo Lazar , Asad Kamal , Alex Deucher , Sasha Levin , evan.quan@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, Hawking.Zhang@amd.com, kevinyang.wang@amd.com, le.ma@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.8 11/23] drm/amd/pm: Restore config space after reset Date: Tue, 7 May 2024 18:56:37 -0400 Message-ID: <20240507225725.390306-11-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240507225725.390306-1-sashal@kernel.org> References: <20240507225725.390306-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.8.9 Content-Transfer-Encoding: 8bit From: Lijo Lazar [ Upstream commit 30d1cda8ce31ab49051ff7159280c542a738b23d ] During mode-2 reset, pci config space registers are affected at device side. However, certain platforms have switches which assign virtual BAR addresses and returns the same even after device is reset. This affects pci_restore_state() as it doesn't issue another config write, if the value read is same as the saved value. Add a workaround to write saved config space values from driver side. Presently, these switches are in platforms with SMU v13.0.6 SOCs, hence restrict the workaround only to those. Signed-off-by: Lijo Lazar Reviewed-by: Asad Kamal Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- .../drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c | 25 +++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c index 78491b04df108..ddb11eb8c3f53 100644 --- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c +++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c @@ -2205,6 +2205,17 @@ static ssize_t smu_v13_0_6_get_gpu_metrics(struct smu_context *smu, void **table return sizeof(*gpu_metrics); } +static void smu_v13_0_6_restore_pci_config(struct smu_context *smu) +{ + struct amdgpu_device *adev = smu->adev; + int i; + + for (i = 0; i < 16; i++) + pci_write_config_dword(adev->pdev, i * 4, + adev->pdev->saved_config_space[i]); + pci_restore_msi_state(adev->pdev); +} + static int smu_v13_0_6_mode2_reset(struct smu_context *smu) { int ret = 0, index; @@ -2226,6 +2237,20 @@ static int smu_v13_0_6_mode2_reset(struct smu_context *smu) /* Restore the config space saved during init */ amdgpu_device_load_pci_state(adev->pdev); + /* Certain platforms have switches which assign virtual BAR values to + * devices. OS uses the virtual BAR values and device behind the switch + * is assgined another BAR value. When device's config space registers + * are queried, switch returns the virtual BAR values. When mode-2 reset + * is performed, switch is unaware of it, and will continue to return + * the same virtual values to the OS.This affects + * pci_restore_config_space() API as it doesn't write the value saved if + * the current value read from config space is the same as what is + * saved. As a workaround, make sure the config space is restored + * always. + */ + if (!(adev->flags & AMD_IS_APU)) + smu_v13_0_6_restore_pci_config(smu); + dev_dbg(smu->adev->dev, "wait for reset ack\n"); do { ret = smu_cmn_wait_for_response(smu); -- 2.43.0