diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/dmar.c | 5 | ||||
| -rw-r--r-- | drivers/pci/pci.c | 13 | ||||
| -rw-r--r-- | drivers/pci/probe.c | 5 |
3 files changed, 18 insertions, 5 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c index e01ca4d6b3e..0e98f6b6f51 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 6af212c509c..cd9b375f49d 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 2fdffc02a30..98ffb2de22e 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -10,9 +10,7 @@ #include <linux/module.h> #include <linux/cpumask.h> #include <linux/pci-aspm.h> -#include <linux/iommu.h> #include <acpi/acpi_hest.h> -#include <xen/xen.h> #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) |