From patchwork Sat Sep 11 09:30:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526704 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H66wx5GrNz9sX3 for ; Sat, 11 Sep 2021 19:33:05 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235513AbhIKJeQ (ORCPT ); Sat, 11 Sep 2021 05:34:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:44280 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235563AbhIKJeL (ORCPT ); Sat, 11 Sep 2021 05:34:11 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B09A4610F8; Sat, 11 Sep 2021 09:32:56 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen Subject: [PATCH V5 01/11] PCI/VGA: Move vgaarb to drivers/pci Date: Sat, 11 Sep 2021 17:30:46 +0800 Message-Id: <20210911093056.1555274-2-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Bjorn Helgaas The VGA arbiter is really PCI-specific and doesn't depend on any GPU things. Move it to the PCI subsystem. Signed-off-by: Bjorn Helgaas --- drivers/gpu/vga/Kconfig | 19 ------------------- drivers/gpu/vga/Makefile | 1 - drivers/pci/Kconfig | 19 +++++++++++++++++++ drivers/pci/Makefile | 1 + drivers/{gpu/vga => pci}/vgaarb.c | 0 5 files changed, 20 insertions(+), 20 deletions(-) rename drivers/{gpu/vga => pci}/vgaarb.c (100%) diff --git a/drivers/gpu/vga/Kconfig b/drivers/gpu/vga/Kconfig index 1ad4c4ef0b5e..eb8b14ab22c3 100644 --- a/drivers/gpu/vga/Kconfig +++ b/drivers/gpu/vga/Kconfig @@ -1,23 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only -config VGA_ARB - bool "VGA Arbitration" if EXPERT - default y - depends on (PCI && !S390) - help - Some "legacy" VGA devices implemented on PCI typically have the same - hard-decoded addresses as they did on ISA. When multiple PCI devices - are accessed at same time they need some kind of coordination. Please - see Documentation/gpu/vgaarbiter.rst for more details. Select this to - enable VGA arbiter. - -config VGA_ARB_MAX_GPUS - int "Maximum number of GPUs" - default 16 - depends on VGA_ARB - help - Reserves space in the kernel to maintain resource locking for - multiple GPUS. The overhead for each GPU is very small. - config VGA_SWITCHEROO bool "Laptop Hybrid Graphics - GPU switching support" depends on X86 diff --git a/drivers/gpu/vga/Makefile b/drivers/gpu/vga/Makefile index e92064442d60..9800620deda3 100644 --- a/drivers/gpu/vga/Makefile +++ b/drivers/gpu/vga/Makefile @@ -1,3 +1,2 @@ # SPDX-License-Identifier: GPL-2.0-only -obj-$(CONFIG_VGA_ARB) += vgaarb.o obj-$(CONFIG_VGA_SWITCHEROO) += vga_switcheroo.o diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 0c473d75e625..7c9e56d7b857 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -252,6 +252,25 @@ config PCIE_BUS_PEER2PEER endchoice +config VGA_ARB + bool "VGA Arbitration" if EXPERT + default y + depends on (PCI && !S390) + help + Some "legacy" VGA devices implemented on PCI typically have the same + hard-decoded addresses as they did on ISA. When multiple PCI devices + are accessed at same time they need some kind of coordination. Please + see Documentation/gpu/vgaarbiter.rst for more details. Select this to + enable VGA arbiter. + +config VGA_ARB_MAX_GPUS + int "Maximum number of GPUs" + default 16 + depends on VGA_ARB + help + Reserves space in the kernel to maintain resource locking for + multiple GPUS. The overhead for each GPU is very small. + source "drivers/pci/hotplug/Kconfig" source "drivers/pci/controller/Kconfig" source "drivers/pci/endpoint/Kconfig" diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index d62c4ac4ae1b..ebe720f69b15 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_PCI_PF_STUB) += pci-pf-stub.o obj-$(CONFIG_PCI_ECAM) += ecam.o obj-$(CONFIG_PCI_P2PDMA) += p2pdma.o obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += xen-pcifront.o +obj-$(CONFIG_VGA_ARB) += vgaarb.o # Endpoint library must be initialized before its users obj-$(CONFIG_PCI_ENDPOINT) += endpoint/ diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/pci/vgaarb.c similarity index 100% rename from drivers/gpu/vga/vgaarb.c rename to drivers/pci/vgaarb.c From patchwork Sat Sep 11 09:30:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526705 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H66xt5yv5z9sX3 for ; Sat, 11 Sep 2021 19:33:54 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235511AbhIKJfF (ORCPT ); Sat, 11 Sep 2021 05:35:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:44392 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235500AbhIKJfF (ORCPT ); Sat, 11 Sep 2021 05:35:05 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 868CF610F8; Sat, 11 Sep 2021 09:33:50 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen , Huacai Chen Subject: [PATCH V5 02/11] PCI/VGA: Prefer vga_default_device() Date: Sat, 11 Sep 2021 17:30:47 +0800 Message-Id: <20210911093056.1555274-3-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Use the vga_default_device() interface consistently instead of directly testing vga_default. No functional change intended. [bhelgaas: split to separate patch and extended] Signed-off-by: Huacai Chen Signed-off-by: Bjorn Helgaas --- drivers/pci/vgaarb.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index 569930552957..6a5169d8578f 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -193,7 +193,7 @@ int vga_remove_vgacon(struct pci_dev *pdev) { int ret = 0; - if (pdev != vga_default) + if (pdev != vga_default_device()) return 0; vgaarb_info(&pdev->dev, "deactivate vga console\n"); @@ -695,7 +695,7 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev) /* Deal with VGA default device. Use first enabled one * by default if arch doesn't have it's own hook */ - if (vga_default == NULL && + if (!vga_default_device() && ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) { vgaarb_info(&pdev->dev, "setting as boot VGA device\n"); vga_set_default_device(pdev); @@ -732,7 +732,7 @@ static bool vga_arbiter_del_pci_device(struct pci_dev *pdev) goto bail; } - if (vga_default == pdev) + if (vga_default_device() == pdev) vga_set_default_device(NULL); if (vgadev->decodes & (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM)) From patchwork Sat Sep 11 09:30:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526706 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H66ym2LbSz9sX3 for ; Sat, 11 Sep 2021 19:34:40 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235634AbhIKJfu (ORCPT ); Sat, 11 Sep 2021 05:35:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:44542 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235640AbhIKJfs (ORCPT ); Sat, 11 Sep 2021 05:35:48 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 04D9D611B0; Sat, 11 Sep 2021 09:34:32 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen , Huacai Chen Subject: [PATCH V5 03/11] PCI/VGA: Move vga_arb_integrated_gpu() earlier in file Date: Sat, 11 Sep 2021 17:30:48 +0800 Message-Id: <20210911093056.1555274-4-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Move vga_arb_integrated_gpu() earlier in file to prepare for future patch. No functional change intended. Signed-off-by: Huacai Chen Signed-off-by: Bjorn Helgaas --- drivers/pci/vgaarb.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index 6a5169d8578f..29e725ebaa43 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -565,6 +565,20 @@ void vga_put(struct pci_dev *pdev, unsigned int rsrc) } EXPORT_SYMBOL(vga_put); +#if defined(CONFIG_ACPI) +static bool vga_arb_integrated_gpu(struct device *dev) +{ + struct acpi_device *adev = ACPI_COMPANION(dev); + + return adev && !strcmp(acpi_device_hid(adev), ACPI_VIDEO_HID); +} +#else +static bool vga_arb_integrated_gpu(struct device *dev) +{ + return false; +} +#endif + /* * Rules for using a bridge to control a VGA descendant decoding: if a bridge * has only one VGA descendant then it can be used to control the VGA routing @@ -1430,20 +1444,6 @@ static struct miscdevice vga_arb_device = { MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops }; -#if defined(CONFIG_ACPI) -static bool vga_arb_integrated_gpu(struct device *dev) -{ - struct acpi_device *adev = ACPI_COMPANION(dev); - - return adev && !strcmp(acpi_device_hid(adev), ACPI_VIDEO_HID); -} -#else -static bool vga_arb_integrated_gpu(struct device *dev) -{ - return false; -} -#endif - static void __init vga_arb_select_default_device(void) { struct pci_dev *pdev, *found = NULL; From patchwork Sat Sep 11 09:30:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526707 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H66zX60z1z9sX3 for ; Sat, 11 Sep 2021 19:35:20 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235485AbhIKJgc (ORCPT ); Sat, 11 Sep 2021 05:36:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:44664 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235481AbhIKJgb (ORCPT ); Sat, 11 Sep 2021 05:36:31 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 76F02610F8; Sat, 11 Sep 2021 09:35:16 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen , Huacai Chen Subject: [PATCH V5 04/11] PCI/VGA: Split out vga_arb_update_default_device() Date: Sat, 11 Sep 2021 17:30:49 +0800 Message-Id: <20210911093056.1555274-5-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This patch is the first step of the rework: If there's no default VGA device, and we find a VGA device that owns the legacy VGA resources, we make that device the default. Split this logic out from vga_arbiter_add_ pci_device() into a new function, vga_arb_update_default_device(). Signed-off-by: Huacai Chen Signed-off-by: Bjorn Helgaas --- drivers/pci/vgaarb.c | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index 29e725ebaa43..f8f95244d499 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -579,6 +579,21 @@ static bool vga_arb_integrated_gpu(struct device *dev) } #endif +static void vga_arb_update_default_device(struct vga_device *vgadev) +{ + struct pci_dev *pdev = vgadev->pdev; + + /* + * If we don't have a default VGA device yet, and this device owns + * the legacy VGA resources, make it the default. + */ + if (!vga_default_device() && + ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) { + vgaarb_info(&pdev->dev, "setting as boot VGA device\n"); + vga_set_default_device(pdev); + } +} + /* * Rules for using a bridge to control a VGA descendant decoding: if a bridge * has only one VGA descendant then it can be used to control the VGA routing @@ -706,15 +721,7 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev) bus = bus->parent; } - /* Deal with VGA default device. Use first enabled one - * by default if arch doesn't have it's own hook - */ - if (!vga_default_device() && - ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) { - vgaarb_info(&pdev->dev, "setting as boot VGA device\n"); - vga_set_default_device(pdev); - } - + vga_arb_update_default_device(vgadev); vga_arbiter_check_bridge_sharing(vgadev); /* Add to the list */ From patchwork Sat Sep 11 09:30:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526708 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H67036qBHz9sX3 for ; Sat, 11 Sep 2021 19:35:47 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235644AbhIKJg7 (ORCPT ); Sat, 11 Sep 2021 05:36:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:44748 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235481AbhIKJgx (ORCPT ); Sat, 11 Sep 2021 05:36:53 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4B7CA610F8; Sat, 11 Sep 2021 09:35:38 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen , Huacai Chen Subject: [PATCH V5 05/11] PCI/VGA: Update default VGA device if a better one found Date: Sat, 11 Sep 2021 17:30:50 +0800 Message-Id: <20210911093056.1555274-6-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This patch is the second step of the rework: Update default VGA device if a better one is found. What is a better one? A device with legacy I/O resources enabled is better those not enabled. And the integrated GPU is better than others. Signed-off-by: Huacai Chen Signed-off-by: Bjorn Helgaas --- drivers/pci/vgaarb.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index f8f95244d499..02b68810273a 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -582,14 +582,32 @@ static bool vga_arb_integrated_gpu(struct device *dev) static void vga_arb_update_default_device(struct vga_device *vgadev) { struct pci_dev *pdev = vgadev->pdev; + struct device *dev = &pdev->dev; + struct vga_device *vgadev_default; /* * If we don't have a default VGA device yet, and this device owns * the legacy VGA resources, make it the default. */ - if (!vga_default_device() && - ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) { - vgaarb_info(&pdev->dev, "setting as boot VGA device\n"); + if (!vga_default_device()) { + if ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK) + vgaarb_info(dev, "setting as boot VGA device\n"); + else + vgaarb_info(dev, "setting as boot device (VGA legacy resources not available)\n"); + vga_set_default_device(pdev); + } + + vgadev_default = vgadev_find(vga_default); + + /* Overridden by a better device */ + if (vgadev_default && ((vgadev_default->owns & VGA_RSRC_LEGACY_MASK) == 0) + && ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) { + vgaarb_info(dev, "overriding boot VGA device\n"); + vga_set_default_device(pdev); + } + + if (vga_arb_integrated_gpu(dev)) { + vgaarb_info(dev, "overriding boot VGA device\n"); vga_set_default_device(pdev); } } From patchwork Sat Sep 11 09:30:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526709 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H670T2zZrz9sX3 for ; Sat, 11 Sep 2021 19:36:09 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235511AbhIKJhU (ORCPT ); Sat, 11 Sep 2021 05:37:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:44834 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235481AbhIKJhU (ORCPT ); Sat, 11 Sep 2021 05:37:20 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D9AE460F9D; Sat, 11 Sep 2021 09:36:04 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen , Huacai Chen Subject: [PATCH V5 06/11] PCI/VGA: Update default VGA device again for X86/IA64 Date: Sat, 11 Sep 2021 17:30:51 +0800 Message-Id: <20210911093056.1555274-7-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This patch is the third step of the rework: On X86 and IA64 platform, update default VGA device if the new found device owns the firmware framebuffer. Signed-off-by: Huacai Chen --- drivers/pci/vgaarb.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index 02b68810273a..c768365138b6 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -584,6 +584,14 @@ static void vga_arb_update_default_device(struct vga_device *vgadev) struct pci_dev *pdev = vgadev->pdev; struct device *dev = &pdev->dev; struct vga_device *vgadev_default; +#if defined(CONFIG_X86) || defined(CONFIG_IA64) + int i; + unsigned long flags; + u64 base = screen_info.lfb_base; + u64 size = screen_info.lfb_size; + u64 limit; + resource_size_t start, end; +#endif /* * If we don't have a default VGA device yet, and this device owns @@ -610,6 +618,43 @@ static void vga_arb_update_default_device(struct vga_device *vgadev) vgaarb_info(dev, "overriding boot VGA device\n"); vga_set_default_device(pdev); } + +#if defined(CONFIG_X86) || defined(CONFIG_IA64) + if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) + base |= (u64)screen_info.ext_lfb_base << 32; + + limit = base + size; + + /* + * Override vga_arbiter_add_pci_device()'s I/O based detection + * as it may take the wrong device (e.g. on Apple system under + * EFI). + * + * Select the device owning the boot framebuffer if there is + * one. + */ + + /* Does firmware framebuffer belong to us? */ + for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { + flags = pci_resource_flags(vgadev->pdev, i); + + if ((flags & IORESOURCE_MEM) == 0) + continue; + + start = pci_resource_start(vgadev->pdev, i); + end = pci_resource_end(vgadev->pdev, i); + + if (!start || !end) + continue; + + if (base < start || limit >= end) + continue; + + if (vgadev->pdev != vga_default_device()) + vgaarb_info(dev, "overriding boot device\n"); + vga_set_default_device(vgadev->pdev); + } +#endif } /* From patchwork Sat Sep 11 09:30:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526710 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H670p1MHdz9sX3 for ; Sat, 11 Sep 2021 19:36:26 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235551AbhIKJhh (ORCPT ); Sat, 11 Sep 2021 05:37:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:44892 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235481AbhIKJhg (ORCPT ); Sat, 11 Sep 2021 05:37:36 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id BFAA660F9D; Sat, 11 Sep 2021 09:36:21 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen , Huacai Chen Subject: [PATCH V5 07/11] PCI/VGA: Remove vga_arb_select_default_device() Date: Sat, 11 Sep 2021 17:30:52 +0800 Message-Id: <20210911093056.1555274-8-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This patch is the last step of the rework: Since vga_arb_update_default_ device() is complete, we can remove vga_arb_select_default_device() and its call-site. Signed-off-by: Huacai Chen Signed-off-by: Bjorn Helgaas --- drivers/pci/vgaarb.c | 89 -------------------------------------------- 1 file changed, 89 deletions(-) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index c768365138b6..5a008d190ed8 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -1514,92 +1514,6 @@ static struct miscdevice vga_arb_device = { MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops }; -static void __init vga_arb_select_default_device(void) -{ - struct pci_dev *pdev, *found = NULL; - struct vga_device *vgadev; - -#if defined(CONFIG_X86) || defined(CONFIG_IA64) - u64 base = screen_info.lfb_base; - u64 size = screen_info.lfb_size; - u64 limit; - resource_size_t start, end; - unsigned long flags; - int i; - - if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) - base |= (u64)screen_info.ext_lfb_base << 32; - - limit = base + size; - - list_for_each_entry(vgadev, &vga_list, list) { - struct device *dev = &vgadev->pdev->dev; - /* - * Override vga_arbiter_add_pci_device()'s I/O based detection - * as it may take the wrong device (e.g. on Apple system under - * EFI). - * - * Select the device owning the boot framebuffer if there is - * one. - */ - - /* Does firmware framebuffer belong to us? */ - for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { - flags = pci_resource_flags(vgadev->pdev, i); - - if ((flags & IORESOURCE_MEM) == 0) - continue; - - start = pci_resource_start(vgadev->pdev, i); - end = pci_resource_end(vgadev->pdev, i); - - if (!start || !end) - continue; - - if (base < start || limit >= end) - continue; - - if (!vga_default_device()) - vgaarb_info(dev, "setting as boot device\n"); - else if (vgadev->pdev != vga_default_device()) - vgaarb_info(dev, "overriding boot device\n"); - vga_set_default_device(vgadev->pdev); - } - } -#endif - - if (!vga_default_device()) { - list_for_each_entry_reverse(vgadev, &vga_list, list) { - struct device *dev = &vgadev->pdev->dev; - u16 cmd; - - pdev = vgadev->pdev; - pci_read_config_word(pdev, PCI_COMMAND, &cmd); - if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) { - found = pdev; - if (vga_arb_integrated_gpu(dev)) - break; - } - } - } - - if (found) { - vgaarb_info(&found->dev, "setting as boot device (VGA legacy resources not available)\n"); - vga_set_default_device(found); - return; - } - - if (!vga_default_device()) { - vgadev = list_first_entry_or_null(&vga_list, - struct vga_device, list); - if (vgadev) { - struct device *dev = &vgadev->pdev->dev; - vgaarb_info(dev, "setting as boot device (VGA legacy resources not available)\n"); - vga_set_default_device(vgadev->pdev); - } - } -} - static int __init vga_arb_device_init(void) { int rc; @@ -1629,9 +1543,6 @@ static int __init vga_arb_device_init(void) vgaarb_info(dev, "no bridge control possible\n"); } - vga_arb_select_default_device(); - - pr_info("loaded\n"); return rc; } subsys_initcall(vga_arb_device_init); From patchwork Sat Sep 11 09:30:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526711 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H671R2jKHz9sX3 for ; Sat, 11 Sep 2021 19:36:59 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235552AbhIKJiK (ORCPT ); Sat, 11 Sep 2021 05:38:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:44984 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235481AbhIKJiK (ORCPT ); Sat, 11 Sep 2021 05:38:10 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 463EA61153; Sat, 11 Sep 2021 09:36:54 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen Subject: [PATCH V5 08/11] PCI/VGA: Remove empty vga_arb_device_card_gone() Date: Sat, 11 Sep 2021 17:30:53 +0800 Message-Id: <20210911093056.1555274-9-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Bjorn Helgaas vga_arb_device_card_gone() has always been empty. Remove it. Signed-off-by: Bjorn Helgaas --- drivers/pci/vgaarb.c | 16 +--------------- 1 file changed, 1 insertion(+), 15 deletions(-) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index 5a008d190ed8..1a829cbacbc8 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -122,8 +122,6 @@ static int vga_str_to_iostate(char *buf, int str_size, int *io_state) /* this is only used a cookie - it should not be dereferenced */ static struct pci_dev *vga_default; -static void vga_arb_device_card_gone(struct pci_dev *pdev); - /* Find somebody in our list */ static struct vga_device *vgadev_find(struct pci_dev *pdev) { @@ -825,10 +823,6 @@ static bool vga_arbiter_del_pci_device(struct pci_dev *pdev) /* Remove entry from list */ list_del(&vgadev->list); vga_count--; - /* Notify userland driver that the device is gone so it discards - * it's copies of the pci_dev pointer - */ - vga_arb_device_card_gone(pdev); /* Wake up all possible waiters */ wake_up_all(&vga_wait_queue); @@ -1078,9 +1072,7 @@ static ssize_t vga_arb_read(struct file *file, char __user *buf, if (lbuf == NULL) return -ENOMEM; - /* Shields against vga_arb_device_card_gone (pci_dev going - * away), and allows access to vga list - */ + /* Protects vga_list */ spin_lock_irqsave(&vga_lock, flags); /* If we are targeting the default, use it */ @@ -1097,8 +1089,6 @@ static ssize_t vga_arb_read(struct file *file, char __user *buf, /* Wow, it's not in the list, that shouldn't happen, * let's fix us up and return invalid card */ - if (pdev == priv->target) - vga_arb_device_card_gone(pdev); spin_unlock_irqrestore(&vga_lock, flags); len = sprintf(lbuf, "invalid"); goto done; @@ -1442,10 +1432,6 @@ static int vga_arb_release(struct inode *inode, struct file *file) return 0; } -static void vga_arb_device_card_gone(struct pci_dev *pdev) -{ -} - /* * callback any registered clients to let them know we have a * change in VGA cards From patchwork Sat Sep 11 09:30:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526712 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H671k4D0hz9sXk for ; Sat, 11 Sep 2021 19:37:14 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235571AbhIKJiZ (ORCPT ); Sat, 11 Sep 2021 05:38:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:45102 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235568AbhIKJiZ (ORCPT ); Sat, 11 Sep 2021 05:38:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D0DC2610F8; Sat, 11 Sep 2021 09:37:09 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen , Huacai Chen Subject: [PATCH V5 09/11] PCI/VGA: Log bridge control messages when adding devices Date: Sat, 11 Sep 2021 17:30:54 +0800 Message-Id: <20210911093056.1555274-10-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Previously vga_arb_device_init() iterated through all VGA devices and indicated whether legacy VGA routing to each could be controlled by an upstream bridge. But we determine that information in vga_arbiter_add_pci_device(), which we call for every device, so we can log it there without iterating through the VGA devices again. Note that we call vga_arbiter_check_bridge_sharing() before adding the device to vga_list, so we have to handle the very first device separately. Signed-off-by: Huacai Chen Signed-off-by: Bjorn Helgaas --- drivers/pci/vgaarb.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index 1a829cbacbc8..5a042f9ac82c 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -672,8 +672,10 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev) vgadev->bridge_has_one_vga = true; - if (list_empty(&vga_list)) + if (list_empty(&vga_list)) { + vgaarb_info(&vgadev->pdev->dev, "bridge control possible\n"); return; + } /* okay iterate the new devices bridge hierarachy */ new_bus = vgadev->pdev->bus; @@ -712,6 +714,11 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev) } new_bus = new_bus->parent; } + + if (vgadev->bridge_has_one_vga) + vgaarb_info(&vgadev->pdev->dev, "bridge control possible\n"); + else + vgaarb_info(&vgadev->pdev->dev, "no bridge control possible\n"); } /* @@ -1504,7 +1511,6 @@ static int __init vga_arb_device_init(void) { int rc; struct pci_dev *pdev; - struct vga_device *vgadev; rc = misc_register(&vga_arb_device); if (rc < 0) @@ -1520,15 +1526,6 @@ static int __init vga_arb_device_init(void) PCI_ANY_ID, pdev)) != NULL) vga_arbiter_add_pci_device(pdev); - list_for_each_entry(vgadev, &vga_list, list) { - struct device *dev = &vgadev->pdev->dev; - - if (vgadev->bridge_has_one_vga) - vgaarb_info(dev, "bridge control possible\n"); - else - vgaarb_info(dev, "no bridge control possible\n"); - } - return rc; } subsys_initcall(vga_arb_device_init); From patchwork Sat Sep 11 09:30:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526713 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H67273n68z9sXk for ; Sat, 11 Sep 2021 19:37:35 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235595AbhIKJiq (ORCPT ); Sat, 11 Sep 2021 05:38:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:45450 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235485AbhIKJio (ORCPT ); Sat, 11 Sep 2021 05:38:44 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0B476611B0; Sat, 11 Sep 2021 09:37:29 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen Subject: [PATCH V5 10/11] PCI/VGA: Use unsigned format string to print lock counts Date: Sat, 11 Sep 2021 17:30:55 +0800 Message-Id: <20210911093056.1555274-11-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Bjorn Helgaas In struct vga_device, io_lock_cnt and mem_lock_cnt are unsigned, but we previously printed them with "%d", the signed decimal format. Print them with the unsigned format "%u" instead. Signed-off-by: Bjorn Helgaas --- drivers/pci/vgaarb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index 5a042f9ac82c..f9581775939b 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -1103,7 +1103,7 @@ static ssize_t vga_arb_read(struct file *file, char __user *buf, /* Fill the buffer with infos */ len = snprintf(lbuf, 1024, - "count:%d,PCI:%s,decodes=%s,owns=%s,locks=%s(%d:%d)\n", + "count:%d,PCI:%s,decodes=%s,owns=%s,locks=%s(%u:%u)\n", vga_decode_count, pci_name(pdev), vga_iostate_to_str(vgadev->decodes), vga_iostate_to_str(vgadev->owns), From patchwork Sat Sep 11 09:30:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?6ZmI5Y2O5omN?= X-Patchwork-Id: 1526714 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H672P4hRjz9sX3 for ; Sat, 11 Sep 2021 19:37:49 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235577AbhIKJjB (ORCPT ); Sat, 11 Sep 2021 05:39:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:45542 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235485AbhIKJjA (ORCPT ); Sat, 11 Sep 2021 05:39:00 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EB3A5610F8; Sat, 11 Sep 2021 09:37:45 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen Subject: [PATCH V5 11/11] PCI/VGA: Replace full MIT license text with SPDX identifier Date: Sat, 11 Sep 2021 17:30:56 +0800 Message-Id: <20210911093056.1555274-12-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Bjorn Helgaas Per Documentation/process/license-rules.rst, the SPDX MIT identifier is equivalent to including the entire MIT license text from LICENSES/preferred/MIT. Replace the MIT license text with the equivalent SPDX identifier. Signed-off-by: Bjorn Helgaas --- drivers/pci/vgaarb.c | 23 +---------------------- 1 file changed, 1 insertion(+), 22 deletions(-) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index f9581775939b..54d0b451b335 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -1,32 +1,11 @@ +// SPDX-License-Identifier: MIT /* * vgaarb.c: Implements the VGA arbitration. For details refer to * Documentation/gpu/vgaarbiter.rst * - * * (C) Copyright 2005 Benjamin Herrenschmidt * (C) Copyright 2007 Paulo R. Zanoni * (C) Copyright 2007, 2009 Tiago Vignatti - * - * Permission is hereby granted, free of charge, to any person obtaining a - * copy of this software and associated documentation files (the "Software"), - * to deal in the Software without restriction, including without limitation - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * and/or sell copies of the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice (including the next - * paragraph) shall be included in all copies or substantial portions of the - * Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING - * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER - * DEALINGS - * IN THE SOFTWARE. - * */ #define pr_fmt(fmt) "vgaarb: " fmt