提交 5d990b62 编写于 作者: C Chris Wright 提交者: Jesse Barnes

PCI: add pci_request_acs

Commit ae21ee65 "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 <allen.m.kay@intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: NChris Wright <chrisw@sous-sol.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
上级 b26a34aa
...@@ -1330,6 +1330,8 @@ void __init amd_iommu_detect(void) ...@@ -1330,6 +1330,8 @@ void __init amd_iommu_detect(void)
gart_iommu_aperture_disabled = 1; gart_iommu_aperture_disabled = 1;
gart_iommu_aperture = 0; gart_iommu_aperture = 0;
#endif #endif
/* Make sure ACS will be enabled */
pci_request_acs();
} }
} }
......
...@@ -27,6 +27,7 @@ ...@@ -27,6 +27,7 @@
#include <linux/page-flags.h> #include <linux/page-flags.h>
#include <linux/highmem.h> #include <linux/highmem.h>
#include <linux/console.h> #include <linux/console.h>
#include <linux/pci.h>
#include <xen/xen.h> #include <xen/xen.h>
#include <xen/interface/xen.h> #include <xen/interface/xen.h>
...@@ -1170,7 +1171,11 @@ asmlinkage void __init xen_start_kernel(void) ...@@ -1170,7 +1171,11 @@ asmlinkage void __init xen_start_kernel(void)
add_preferred_console("xenboot", 0, NULL); add_preferred_console("xenboot", 0, NULL);
add_preferred_console("tty", 0, NULL); add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 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"); xen_raw_console_write("about to get started...\n");
......
...@@ -614,8 +614,11 @@ void __init detect_intel_iommu(void) ...@@ -614,8 +614,11 @@ void __init detect_intel_iommu(void)
#endif #endif
#ifdef CONFIG_DMAR #ifdef CONFIG_DMAR
if (ret && !no_iommu && !iommu_detected && !swiotlb && if (ret && !no_iommu && !iommu_detected && !swiotlb &&
!dmar_disabled) !dmar_disabled) {
iommu_detected = 1; iommu_detected = 1;
/* Make sure ACS will be enabled */
pci_request_acs();
}
#endif #endif
} }
early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size); early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size);
......
...@@ -1550,6 +1550,16 @@ void pci_enable_ari(struct pci_dev *dev) ...@@ -1550,6 +1550,16 @@ void pci_enable_ari(struct pci_dev *dev)
bridge->ari_enabled = 1; 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 * pci_enable_acs - enable ACS if hardware support it
* @dev: the PCI device * @dev: the PCI device
...@@ -1560,6 +1570,9 @@ void pci_enable_acs(struct pci_dev *dev) ...@@ -1560,6 +1570,9 @@ void pci_enable_acs(struct pci_dev *dev)
u16 cap; u16 cap;
u16 ctrl; u16 ctrl;
if (!pci_acs_enable)
return;
if (!pci_is_pcie(dev)) if (!pci_is_pcie(dev))
return; return;
......
...@@ -10,9 +10,7 @@ ...@@ -10,9 +10,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/cpumask.h> #include <linux/cpumask.h>
#include <linux/pci-aspm.h> #include <linux/pci-aspm.h>
#include <linux/iommu.h>
#include <acpi/acpi_hest.h> #include <acpi/acpi_hest.h>
#include <xen/xen.h>
#include "pci.h" #include "pci.h"
#define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
...@@ -1029,8 +1027,7 @@ static void pci_init_capabilities(struct pci_dev *dev) ...@@ -1029,8 +1027,7 @@ static void pci_init_capabilities(struct pci_dev *dev)
pci_iov_init(dev); pci_iov_init(dev);
/* Enable ACS P2P upstream forwarding */ /* 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) void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
......
...@@ -1328,5 +1328,7 @@ static inline bool pci_is_pcie(struct pci_dev *dev) ...@@ -1328,5 +1328,7 @@ static inline bool pci_is_pcie(struct pci_dev *dev)
return !!pci_pcie_cap(dev); return !!pci_pcie_cap(dev);
} }
void pci_request_acs(void);
#endif /* __KERNEL__ */ #endif /* __KERNEL__ */
#endif /* LINUX_PCI_H */ #endif /* LINUX_PCI_H */
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