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Intel IOMMU: PCI generic helper function

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When devices are under a p2p bridge, upstream transactions get replaced by the
device id of the bridge as it owns the PCIE transaction.  Hence its necessary
to setup translations on behalf of the bridge as well.  Due to this limitation
all devices under a p2p share the same domain in a DMAR.

We just cache the type of device, if its a native PCIe device
or not for later use.

[[email protected]: BUG_ON -> WARN_ON+recover]
Signed-off-by: Anil S Keshavamurthy <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Muli Ben-Yehuda <[email protected]>
Cc: "Siddha, Suresh B" <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Ashok Raj <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Keshavamurthy, Anil S 2007-10-21 16:41:46 -07:00 • committed by Linus Torvalds
commit 994a65e25d
4 changed files with 51 additions and 0 deletions
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1
drivers/pci/pci.h
View file

@ -90,3 +90,4 @@ pci_match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
return NULL;
}
struct pci_dev *pci_find_upstream_pcie_bridge(struct pci_dev *pdev);

14
drivers/pci/probe.c
View file

@ -837,6 +837,19 @@ static void pci_release_dev(struct device *dev)
kfree(pci_dev);
}
static void set_pcie_port_type(struct pci_dev *pdev)
{
int pos;
u16 reg16;
pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
if (!pos)
return;
pdev->is_pcie = 1;
pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
}
/**
* pci_cfg_space_size - get the configuration space size of the PCI device.
* @dev: PCI device
@ -951,6 +964,7 @@ pci_scan_device(struct pci_bus *bus, int devfn)
dev->device = (l >> 16) & 0xffff;
dev->cfg_size = pci_cfg_space_size(dev);
dev->error_state = pci_channel_io_normal;
set_pcie_port_type(dev);
/* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
set this higher, assuming the system even supports it. */

34
drivers/pci/search.c
View file

@ -14,6 +14,40 @@
#include "pci.h"
DECLARE_RWSEM(pci_bus_sem);
/*
* find the upstream PCIE-to-PCI bridge of a PCI device
* if the device is PCIE, return NULL
* if the device isn't connected to a PCIE bridge (that is its parent is a
* legacy PCI bridge and the bridge is directly connected to bus 0), return its
* parent
*/
struct pci_dev *
pci_find_upstream_pcie_bridge(struct pci_dev *pdev)
{
struct pci_dev *tmp = NULL;
if (pdev->is_pcie)
return NULL;
while (1) {
if (!pdev->bus->self)
break;
pdev = pdev->bus->self;
/* a p2p bridge */
if (!pdev->is_pcie) {
tmp = pdev;
continue;
}
/* PCI device should connect to a PCIE bridge */
if (pdev->pcie_type != PCI_EXP_TYPE_PCI_BRIDGE) {
/* Busted hardware? */
WARN_ON_ONCE(1);
return NULL;
}
return pdev;
}
return tmp;
}
static struct pci_bus *pci_do_find_bus(struct pci_bus *bus, unsigned char busnr)
{