Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757277AbZLDUPt (ORCPT ); Fri, 4 Dec 2009 15:15:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757226AbZLDUPs (ORCPT ); Fri, 4 Dec 2009 15:15:48 -0500 Received: from sous-sol.org ([216.99.217.87]:47942 "EHLO sequoia.sous-sol.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757147AbZLDUPr (ORCPT ); Fri, 4 Dec 2009 15:15:47 -0500 Date: Fri, 4 Dec 2009 12:15:21 -0800 From: Chris Wright To: jbarnes@virtuousgeek.org Cc: Allen Kay , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, matthew@wil.cx, chrisw@sous-sol.org, jeremy@goop.org, donald.d.dugger@intel.com, joerg.roedel@amd.com, dwmw2@infradead.org, iommu@lists.linux-foundation.org Subject: [PATCH] pci: add pci_request_acs Message-ID: <20091204201521.GJ21174@sequoia.sous-sol.org> References: <1254936437-18577-1-git-send-email-allen.m.kay@intel.com> <20091204191754.GI21174@sequoia.sous-sol.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20091204191754.GI21174@sequoia.sous-sol.org> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4556 Lines: 153 Commit ae21ee65e8bc228416bbcc8a1da01c56a847a60c "PCI: acs p2p upsteram forwarding enabling" doesn't actually enable ACS. Add a function to pci core to allow an IOMMU to request that ACS be enabled. The existing mechanism of using iommu_found() in the pci core to know when ACS should be enabled doesn't actually work due to initialization order; iommu has only been detected not initialized. Have Intel and AMD IOMMUs request ACS, and Xen does as well during early init of dom0. Cc: Allen Kay Cc: David Woodhouse Cc: Jeremy Fitzhardinge Cc: Joerg Roedel Signed-off-by: Chris Wright --- Applies against the linux-next branch of Jesse's pci tree. arch/x86/kernel/amd_iommu_init.c | 2 ++ arch/x86/xen/enlighten.c | 5 +++++ drivers/pci/dmar.c | 5 ++++- drivers/pci/pci.c | 13 +++++++++++++ drivers/pci/probe.c | 5 +---- include/linux/pci.h | 2 ++ 6 files changed, 27 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c index b4b61d4..e60530a 100644 --- a/arch/x86/kernel/amd_iommu_init.c +++ b/arch/x86/kernel/amd_iommu_init.c @@ -1330,6 +1330,8 @@ void __init amd_iommu_detect(void) gart_iommu_aperture_disabled = 1; gart_iommu_aperture = 0; #endif + /* Make sure ACS will be enabled */ + pci_request_acs(); } } diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 5bccd70..e2511bc 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include @@ -1170,7 +1171,11 @@ asmlinkage void __init xen_start_kernel(void) add_preferred_console("xenboot", 0, NULL); add_preferred_console("tty", 0, NULL); add_preferred_console("hvc", 0, NULL); + } else { + /* Make sure ACS will be enabled */ + pci_request_acs(); } + xen_raw_console_write("about to get started...\n"); diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c index e01ca4d..0e98f6b 100644 --- a/drivers/pci/dmar.c +++ b/drivers/pci/dmar.c @@ -614,8 +614,11 @@ void __init detect_intel_iommu(void) #endif #ifdef CONFIG_DMAR if (ret && !no_iommu && !iommu_detected && !swiotlb && - !dmar_disabled) + !dmar_disabled) { iommu_detected = 1; + /* Make sure ACS will be enabled */ + pci_request_acs(); + } #endif } early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size); diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 453d6ba..fc8fa3f 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1550,6 +1550,16 @@ void pci_enable_ari(struct pci_dev *dev) bridge->ari_enabled = 1; } +static int pci_acs_enable; + +/** + * pci_request_acs - ask for ACS to be enabled if supported + */ +void pci_request_acs(void) +{ + pci_acs_enable = 1; +} + /** * pci_enable_acs - enable ACS if hardware support it * @dev: the PCI device @@ -1560,6 +1570,9 @@ void pci_enable_acs(struct pci_dev *dev) u16 cap; u16 ctrl; + if (!pci_acs_enable) + return; + if (!pci_is_pcie(dev)) return; diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 2fdffc0..98ffb2d 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -10,9 +10,7 @@ #include #include #include -#include #include -#include #include "pci.h" #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ @@ -1029,8 +1027,7 @@ static void pci_init_capabilities(struct pci_dev *dev) pci_iov_init(dev); /* Enable ACS P2P upstream forwarding */ - if (iommu_found() || xen_initial_domain()) - pci_enable_acs(dev); + pci_enable_acs(dev); } void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) diff --git a/include/linux/pci.h b/include/linux/pci.h index 2891c3d..04771b9 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1328,5 +1328,7 @@ static inline bool pci_is_pcie(struct pci_dev *dev) return !!pci_pcie_cap(dev); } +void pci_request_acs(void); + #endif /* __KERNEL__ */ #endif /* LINUX_PCI_H */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/