From patchwork Thu May 11 13:14:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Ilpo_J=C3=A4rvinen?= X-Patchwork-Id: 13238900 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1291CC7EE24 for ; Fri, 12 May 2023 08:49:02 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3124A10E641; Fri, 12 May 2023 08:48:38 +0000 (UTC) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3F2C810E1F6; Thu, 11 May 2023 13:15:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1683810908; x=1715346908; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=u7xUvlsA5P4gtzwST7F7+pgPTnNFMN6i6koTFJ8FbGY=; b=fIZJrdBLWVZPpgkIsbuyVh99dM4yLfse4B22ald60HYCawk+TctBhAYP /7jMI/tmyfF26J8cyWcT+Tw2Gi8x3X50xCvAX2He7XGiScZ/kmcrOVixu yRhI+CRP/6EKI5fJHgBqUecIZg1FD250ozUSMYvSeyqywjbw7SHUZ00Hy tJ5BPvAZX2EQAobIeOvj0F2Wp10jlhLsQSxz+mL1J+Ctp4BcrOhZmSNYN fZaZY7EmRn7TltKYb1emO6gQqu5O+1K4M9KhFm9RnHHTmptkbnbePowBV UYzUDUU+b/Ds2A9flpH1dj7YJQoUpdpMnQ9aZDL4Ey0qsDCW7Y66OLXUl Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10706"; a="378619380" X-IronPort-AV: E=Sophos;i="5.99,266,1677571200"; d="scan'208";a="378619380" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2023 06:15:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10706"; a="650169558" X-IronPort-AV: E=Sophos;i="5.99,266,1677571200"; d="scan'208";a="650169558" Received: from jsanche3-mobl1.ger.corp.intel.com (HELO ijarvine-MOBL2.ger.corp.intel.com) ([10.252.39.112]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2023 06:15:02 -0700 From: =?utf-8?q?Ilpo_J=C3=A4rvinen?= To: linux-pci@vger.kernel.org, Bjorn Helgaas , Rob Herring , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Lukas Wunner , Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , "Pan, Xinhui" , David Airlie , Daniel Vetter , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH 04/17] drm/amdgpu: Use pcie_lnkctl{, 2}_clear_and_set() for changing LNKCTL{, 2} Date: Thu, 11 May 2023 16:14:28 +0300 Message-Id: <20230511131441.45704-5-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230511131441.45704-1-ilpo.jarvinen@linux.intel.com> References: <20230511131441.45704-1-ilpo.jarvinen@linux.intel.com> MIME-Version: 1.0 X-Mailman-Approved-At: Fri, 12 May 2023 08:48:34 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?q?Ilpo_J=C3=A4rvinen?= Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Don't assume that only the driver would be accessing LNKCTL/LNKCTL2. ASPM policy changes can trigger write to LNKCTL outside of driver's control. And in the case of upstream (parent), the driver does not even own the device it's changing the registers for. Use pcie_lnkctl_clear_and_set() and pcie_lnkctl2_clear_and_set() which do proper locking to avoid losing concurrent updates to the register value. Suggested-by: Lukas Wunner Signed-off-by: Ilpo Järvinen --- drivers/gpu/drm/amd/amdgpu/cik.c | 72 +++++++++---------------------- drivers/gpu/drm/amd/amdgpu/si.c | 74 +++++++++----------------------- 2 files changed, 41 insertions(+), 105 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/cik.c b/drivers/gpu/drm/amd/amdgpu/cik.c index de6d10390ab2..f9f2c28c7125 100644 --- a/drivers/gpu/drm/amd/amdgpu/cik.c +++ b/drivers/gpu/drm/amd/amdgpu/cik.c @@ -1574,17 +1574,8 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev) u16 bridge_cfg2, gpu_cfg2; u32 max_lw, current_lw, tmp; - pcie_capability_read_word(root, PCI_EXP_LNKCTL, - &bridge_cfg); - pcie_capability_read_word(adev->pdev, PCI_EXP_LNKCTL, - &gpu_cfg); - - tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD; - pcie_capability_write_word(root, PCI_EXP_LNKCTL, tmp16); - - tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD; - pcie_capability_write_word(adev->pdev, PCI_EXP_LNKCTL, - tmp16); + pcie_lnkctl_clear_and_set(root, 0, PCI_EXP_LNKCTL_HAWD); + pcie_lnkctl_clear_and_set(adev->pdev, 0, PCI_EXP_LNKCTL_HAWD); tmp = RREG32_PCIE(ixPCIE_LC_STATUS1); max_lw = (tmp & PCIE_LC_STATUS1__LC_DETECTED_LINK_WIDTH_MASK) >> @@ -1637,45 +1628,24 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev) msleep(100); /* linkctl */ - pcie_capability_read_word(root, PCI_EXP_LNKCTL, - &tmp16); - tmp16 &= ~PCI_EXP_LNKCTL_HAWD; - tmp16 |= (bridge_cfg & PCI_EXP_LNKCTL_HAWD); - pcie_capability_write_word(root, PCI_EXP_LNKCTL, - tmp16); - - pcie_capability_read_word(adev->pdev, - PCI_EXP_LNKCTL, - &tmp16); - tmp16 &= ~PCI_EXP_LNKCTL_HAWD; - tmp16 |= (gpu_cfg & PCI_EXP_LNKCTL_HAWD); - pcie_capability_write_word(adev->pdev, - PCI_EXP_LNKCTL, - tmp16); + pcie_lnkctl_clear_and_set(root, PCI_EXP_LNKCTL_HAWD, + bridge_cfg & PCI_EXP_LNKCTL_HAWD); + pcie_lnkctl_clear_and_set(adev->pdev, PCI_EXP_LNKCTL_HAWD, + gpu_cfg & PCI_EXP_LNKCTL_HAWD); /* linkctl2 */ - pcie_capability_read_word(root, PCI_EXP_LNKCTL2, - &tmp16); - tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN); - tmp16 |= (bridge_cfg2 & - (PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN)); - pcie_capability_write_word(root, - PCI_EXP_LNKCTL2, - tmp16); - - pcie_capability_read_word(adev->pdev, - PCI_EXP_LNKCTL2, - &tmp16); - tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN); - tmp16 |= (gpu_cfg2 & - (PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN)); - pcie_capability_write_word(adev->pdev, - PCI_EXP_LNKCTL2, - tmp16); + pcie_lnkctl2_clear_and_set(root, + PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN, + bridge_cfg2 & + (PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN)); + pcie_lnkctl2_clear_and_set(adev->pdev, + PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN, + gpu_cfg2 & + (PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN)); tmp = RREG32_PCIE(ixPCIE_LC_CNTL4); tmp &= ~PCIE_LC_CNTL4__LC_SET_QUIESCE_MASK; @@ -1690,16 +1660,14 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev) speed_cntl &= ~PCIE_LC_SPEED_CNTL__LC_FORCE_DIS_SW_SPEED_CHANGE_MASK; WREG32_PCIE(ixPCIE_LC_SPEED_CNTL, speed_cntl); - pcie_capability_read_word(adev->pdev, PCI_EXP_LNKCTL2, &tmp16); - tmp16 &= ~PCI_EXP_LNKCTL2_TLS; - + tmp16 = 0; if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3) tmp16 |= PCI_EXP_LNKCTL2_TLS_8_0GT; /* gen3 */ else if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2) tmp16 |= PCI_EXP_LNKCTL2_TLS_5_0GT; /* gen2 */ else tmp16 |= PCI_EXP_LNKCTL2_TLS_2_5GT; /* gen1 */ - pcie_capability_write_word(adev->pdev, PCI_EXP_LNKCTL2, tmp16); + pcie_lnkctl2_clear_and_set(adev->pdev, PCI_EXP_LNKCTL2_TLS, tmp16); speed_cntl = RREG32_PCIE(ixPCIE_LC_SPEED_CNTL); speed_cntl |= PCIE_LC_SPEED_CNTL__LC_INITIATE_LINK_SPEED_CHANGE_MASK; diff --git a/drivers/gpu/drm/amd/amdgpu/si.c b/drivers/gpu/drm/amd/amdgpu/si.c index 7f99e130acd0..e60174d0dfb8 100644 --- a/drivers/gpu/drm/amd/amdgpu/si.c +++ b/drivers/gpu/drm/amd/amdgpu/si.c @@ -2276,17 +2276,8 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev) u16 bridge_cfg2, gpu_cfg2; u32 max_lw, current_lw, tmp; - pcie_capability_read_word(root, PCI_EXP_LNKCTL, - &bridge_cfg); - pcie_capability_read_word(adev->pdev, PCI_EXP_LNKCTL, - &gpu_cfg); - - tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD; - pcie_capability_write_word(root, PCI_EXP_LNKCTL, tmp16); - - tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD; - pcie_capability_write_word(adev->pdev, PCI_EXP_LNKCTL, - tmp16); + pcie_lnkctl_clear_and_set(root, 0, PCI_EXP_LNKCTL_HAWD); + pcie_lnkctl_clear_and_set(adev->pdev, 0, PCI_EXP_LNKCTL_HAWD); tmp = RREG32_PCIE(PCIE_LC_STATUS1); max_lw = (tmp & LC_DETECTED_LINK_WIDTH_MASK) >> LC_DETECTED_LINK_WIDTH_SHIFT; @@ -2331,44 +2322,23 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev) mdelay(100); - pcie_capability_read_word(root, PCI_EXP_LNKCTL, - &tmp16); - tmp16 &= ~PCI_EXP_LNKCTL_HAWD; - tmp16 |= (bridge_cfg & PCI_EXP_LNKCTL_HAWD); - pcie_capability_write_word(root, PCI_EXP_LNKCTL, - tmp16); - - pcie_capability_read_word(adev->pdev, - PCI_EXP_LNKCTL, - &tmp16); - tmp16 &= ~PCI_EXP_LNKCTL_HAWD; - tmp16 |= (gpu_cfg & PCI_EXP_LNKCTL_HAWD); - pcie_capability_write_word(adev->pdev, - PCI_EXP_LNKCTL, - tmp16); - - pcie_capability_read_word(root, PCI_EXP_LNKCTL2, - &tmp16); - tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN); - tmp16 |= (bridge_cfg2 & - (PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN)); - pcie_capability_write_word(root, - PCI_EXP_LNKCTL2, - tmp16); - - pcie_capability_read_word(adev->pdev, - PCI_EXP_LNKCTL2, - &tmp16); - tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN); - tmp16 |= (gpu_cfg2 & - (PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN)); - pcie_capability_write_word(adev->pdev, - PCI_EXP_LNKCTL2, - tmp16); + pcie_lnkctl_clear_and_set(root, PCI_EXP_LNKCTL_HAWD, + bridge_cfg & PCI_EXP_LNKCTL_HAWD); + pcie_lnkctl_clear_and_set(adev->pdev, PCI_EXP_LNKCTL_HAWD, + gpu_cfg & PCI_EXP_LNKCTL_HAWD); + + pcie_lnkctl2_clear_and_set(root, + PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN, + bridge_cfg2 & + (PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN)); + pcie_lnkctl2_clear_and_set(adev->pdev, + PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN, + gpu_cfg2 & + (PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN)); tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4); tmp &= ~LC_SET_QUIESCE; @@ -2381,16 +2351,14 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev) speed_cntl &= ~LC_FORCE_DIS_SW_SPEED_CHANGE; WREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL, speed_cntl); - pcie_capability_read_word(adev->pdev, PCI_EXP_LNKCTL2, &tmp16); - tmp16 &= ~PCI_EXP_LNKCTL2_TLS; - + tmp16 = 0; if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3) tmp16 |= PCI_EXP_LNKCTL2_TLS_8_0GT; /* gen3 */ else if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2) tmp16 |= PCI_EXP_LNKCTL2_TLS_5_0GT; /* gen2 */ else tmp16 |= PCI_EXP_LNKCTL2_TLS_2_5GT; /* gen1 */ - pcie_capability_write_word(adev->pdev, PCI_EXP_LNKCTL2, tmp16); + pcie_lnkctl2_clear_and_set(adev->pdev, PCI_EXP_LNKCTL2_TLS, tmp16); speed_cntl = RREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL); speed_cntl |= LC_INITIATE_LINK_SPEED_CHANGE;