mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
iommu/vt-d: Update to use PCI DMA aliases
VT-d code currently makes use of pci_find_upstream_pcie_bridge() in order to find the topology based alias of a device. This function has a few problems. First, it doesn't check the entire alias path of the device to the root bus, therefore if a PCIe device is masked upstream, the wrong result is produced. Also, it's known to get confused and give up when it crosses a bridge from a conventional PCI bus to a PCIe bus that lacks a PCIe capability. The PCI-core provided DMA alias support solves both of these problems and additionally adds support for DMA function quirks allowing VT-d to work with devices like Marvell and Ricoh with known broken requester IDs. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
parent
e17f9ff413
commit
579305f75d
@ -1841,54 +1841,56 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct domain_context_mapping_data {
|
||||
struct dmar_domain *domain;
|
||||
struct intel_iommu *iommu;
|
||||
int translation;
|
||||
};
|
||||
|
||||
static int domain_context_mapping_cb(struct pci_dev *pdev,
|
||||
u16 alias, void *opaque)
|
||||
{
|
||||
struct domain_context_mapping_data *data = opaque;
|
||||
|
||||
return domain_context_mapping_one(data->domain, data->iommu,
|
||||
PCI_BUS_NUM(alias), alias & 0xff,
|
||||
data->translation);
|
||||
}
|
||||
|
||||
static int
|
||||
domain_context_mapping(struct dmar_domain *domain, struct device *dev,
|
||||
int translation)
|
||||
{
|
||||
int ret;
|
||||
struct pci_dev *pdev, *tmp, *parent;
|
||||
struct intel_iommu *iommu;
|
||||
u8 bus, devfn;
|
||||
struct domain_context_mapping_data data;
|
||||
|
||||
iommu = device_to_iommu(dev, &bus, &devfn);
|
||||
if (!iommu)
|
||||
return -ENODEV;
|
||||
|
||||
ret = domain_context_mapping_one(domain, iommu, bus, devfn,
|
||||
translation);
|
||||
if (ret || !dev_is_pci(dev))
|
||||
return ret;
|
||||
|
||||
/* dependent device mapping */
|
||||
pdev = to_pci_dev(dev);
|
||||
tmp = pci_find_upstream_pcie_bridge(pdev);
|
||||
if (!tmp)
|
||||
return 0;
|
||||
/* Secondary interface's bus number and devfn 0 */
|
||||
parent = pdev->bus->self;
|
||||
while (parent != tmp) {
|
||||
ret = domain_context_mapping_one(domain, iommu,
|
||||
parent->bus->number,
|
||||
parent->devfn, translation);
|
||||
if (ret)
|
||||
return ret;
|
||||
parent = parent->bus->self;
|
||||
}
|
||||
if (pci_is_pcie(tmp)) /* this is a PCIe-to-PCI bridge */
|
||||
return domain_context_mapping_one(domain, iommu,
|
||||
tmp->subordinate->number, 0,
|
||||
translation);
|
||||
else /* this is a legacy PCI bridge */
|
||||
return domain_context_mapping_one(domain, iommu,
|
||||
tmp->bus->number,
|
||||
tmp->devfn,
|
||||
if (!dev_is_pci(dev))
|
||||
return domain_context_mapping_one(domain, iommu, bus, devfn,
|
||||
translation);
|
||||
|
||||
data.domain = domain;
|
||||
data.iommu = iommu;
|
||||
data.translation = translation;
|
||||
|
||||
return pci_for_each_dma_alias(to_pci_dev(dev),
|
||||
&domain_context_mapping_cb, &data);
|
||||
}
|
||||
|
||||
static int domain_context_mapped_cb(struct pci_dev *pdev,
|
||||
u16 alias, void *opaque)
|
||||
{
|
||||
struct intel_iommu *iommu = opaque;
|
||||
|
||||
return !device_context_mapped(iommu, PCI_BUS_NUM(alias), alias & 0xff);
|
||||
}
|
||||
|
||||
static int domain_context_mapped(struct device *dev)
|
||||
{
|
||||
int ret;
|
||||
struct pci_dev *pdev, *tmp, *parent;
|
||||
struct intel_iommu *iommu;
|
||||
u8 bus, devfn;
|
||||
|
||||
@ -1896,30 +1898,11 @@ static int domain_context_mapped(struct device *dev)
|
||||
if (!iommu)
|
||||
return -ENODEV;
|
||||
|
||||
ret = device_context_mapped(iommu, bus, devfn);
|
||||
if (!ret || !dev_is_pci(dev))
|
||||
return ret;
|
||||
if (!dev_is_pci(dev))
|
||||
return device_context_mapped(iommu, bus, devfn);
|
||||
|
||||
/* dependent device mapping */
|
||||
pdev = to_pci_dev(dev);
|
||||
tmp = pci_find_upstream_pcie_bridge(pdev);
|
||||
if (!tmp)
|
||||
return ret;
|
||||
/* Secondary interface's bus number and devfn 0 */
|
||||
parent = pdev->bus->self;
|
||||
while (parent != tmp) {
|
||||
ret = device_context_mapped(iommu, parent->bus->number,
|
||||
parent->devfn);
|
||||
if (!ret)
|
||||
return ret;
|
||||
parent = parent->bus->self;
|
||||
}
|
||||
if (pci_is_pcie(tmp))
|
||||
return device_context_mapped(iommu, tmp->subordinate->number,
|
||||
0);
|
||||
else
|
||||
return device_context_mapped(iommu, tmp->bus->number,
|
||||
tmp->devfn);
|
||||
return !pci_for_each_dma_alias(to_pci_dev(dev),
|
||||
domain_context_mapped_cb, iommu);
|
||||
}
|
||||
|
||||
/* Returns a number of VTD pages, but aligned to MM page size */
|
||||
@ -2208,79 +2191,86 @@ static struct dmar_domain *dmar_insert_dev_info(struct intel_iommu *iommu,
|
||||
return domain;
|
||||
}
|
||||
|
||||
static int get_last_alias(struct pci_dev *pdev, u16 alias, void *opaque)
|
||||
{
|
||||
*(u16 *)opaque = alias;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* domain is initialized */
|
||||
static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
|
||||
{
|
||||
struct dmar_domain *domain, *free = NULL;
|
||||
struct intel_iommu *iommu = NULL;
|
||||
struct dmar_domain *domain, *tmp;
|
||||
struct intel_iommu *iommu;
|
||||
struct device_domain_info *info;
|
||||
struct pci_dev *dev_tmp = NULL;
|
||||
u16 dma_alias;
|
||||
unsigned long flags;
|
||||
u8 bus, devfn, bridge_bus, bridge_devfn;
|
||||
u8 bus, devfn;
|
||||
|
||||
domain = find_domain(dev);
|
||||
if (domain)
|
||||
return domain;
|
||||
|
||||
if (dev_is_pci(dev)) {
|
||||
struct pci_dev *pdev = to_pci_dev(dev);
|
||||
u16 segment;
|
||||
|
||||
segment = pci_domain_nr(pdev->bus);
|
||||
dev_tmp = pci_find_upstream_pcie_bridge(pdev);
|
||||
if (dev_tmp) {
|
||||
if (pci_is_pcie(dev_tmp)) {
|
||||
bridge_bus = dev_tmp->subordinate->number;
|
||||
bridge_devfn = 0;
|
||||
} else {
|
||||
bridge_bus = dev_tmp->bus->number;
|
||||
bridge_devfn = dev_tmp->devfn;
|
||||
}
|
||||
spin_lock_irqsave(&device_domain_lock, flags);
|
||||
info = dmar_search_domain_by_dev_info(segment,
|
||||
bridge_bus,
|
||||
bridge_devfn);
|
||||
if (info) {
|
||||
iommu = info->iommu;
|
||||
domain = info->domain;
|
||||
}
|
||||
spin_unlock_irqrestore(&device_domain_lock, flags);
|
||||
/* pcie-pci bridge already has a domain, uses it */
|
||||
if (info)
|
||||
goto found_domain;
|
||||
}
|
||||
}
|
||||
|
||||
iommu = device_to_iommu(dev, &bus, &devfn);
|
||||
if (!iommu)
|
||||
goto error;
|
||||
return NULL;
|
||||
|
||||
if (dev_is_pci(dev)) {
|
||||
struct pci_dev *pdev = to_pci_dev(dev);
|
||||
|
||||
pci_for_each_dma_alias(pdev, get_last_alias, &dma_alias);
|
||||
|
||||
spin_lock_irqsave(&device_domain_lock, flags);
|
||||
info = dmar_search_domain_by_dev_info(pci_domain_nr(pdev->bus),
|
||||
PCI_BUS_NUM(dma_alias),
|
||||
dma_alias & 0xff);
|
||||
if (info) {
|
||||
iommu = info->iommu;
|
||||
domain = info->domain;
|
||||
}
|
||||
spin_unlock_irqrestore(&device_domain_lock, flags);
|
||||
|
||||
/* DMA alias already has a domain, uses it */
|
||||
if (info)
|
||||
goto found_domain;
|
||||
}
|
||||
|
||||
/* Allocate and initialize new domain for the device */
|
||||
domain = alloc_domain(false);
|
||||
if (!domain)
|
||||
goto error;
|
||||
return NULL;
|
||||
|
||||
if (iommu_attach_domain(domain, iommu)) {
|
||||
free_domain_mem(domain);
|
||||
domain = NULL;
|
||||
goto error;
|
||||
return NULL;
|
||||
}
|
||||
free = domain;
|
||||
if (domain_init(domain, gaw))
|
||||
goto error;
|
||||
|
||||
/* register pcie-to-pci device */
|
||||
if (dev_tmp) {
|
||||
domain = dmar_insert_dev_info(iommu, bridge_bus, bridge_devfn,
|
||||
NULL, domain);
|
||||
if (domain_init(domain, gaw)) {
|
||||
domain_exit(domain);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* register PCI DMA alias device */
|
||||
if (dev_is_pci(dev)) {
|
||||
tmp = dmar_insert_dev_info(iommu, PCI_BUS_NUM(dma_alias),
|
||||
dma_alias & 0xff, NULL, domain);
|
||||
|
||||
if (!tmp || tmp != domain) {
|
||||
domain_exit(domain);
|
||||
domain = tmp;
|
||||
}
|
||||
|
||||
if (!domain)
|
||||
goto error;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
found_domain:
|
||||
domain = dmar_insert_dev_info(iommu, bus, devfn, dev, domain);
|
||||
error:
|
||||
if (free != domain)
|
||||
domain_exit(free);
|
||||
tmp = dmar_insert_dev_info(iommu, bus, devfn, dev, domain);
|
||||
|
||||
if (!tmp || tmp != domain) {
|
||||
domain_exit(domain);
|
||||
domain = tmp;
|
||||
}
|
||||
|
||||
return domain;
|
||||
}
|
||||
@ -4043,33 +4033,27 @@ out_free_dmar:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int iommu_detach_dev_cb(struct pci_dev *pdev, u16 alias, void *opaque)
|
||||
{
|
||||
struct intel_iommu *iommu = opaque;
|
||||
|
||||
iommu_detach_dev(iommu, PCI_BUS_NUM(alias), alias & 0xff);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* NB - intel-iommu lacks any sort of reference counting for the users of
|
||||
* dependent devices. If multiple endpoints have intersecting dependent
|
||||
* devices, unbinding the driver from any one of them will possibly leave
|
||||
* the others unable to operate.
|
||||
*/
|
||||
static void iommu_detach_dependent_devices(struct intel_iommu *iommu,
|
||||
struct device *dev)
|
||||
{
|
||||
struct pci_dev *tmp, *parent, *pdev;
|
||||
|
||||
if (!iommu || !dev || !dev_is_pci(dev))
|
||||
return;
|
||||
|
||||
pdev = to_pci_dev(dev);
|
||||
|
||||
/* dependent device detach */
|
||||
tmp = pci_find_upstream_pcie_bridge(pdev);
|
||||
/* Secondary interface's bus number and devfn 0 */
|
||||
if (tmp) {
|
||||
parent = pdev->bus->self;
|
||||
while (parent != tmp) {
|
||||
iommu_detach_dev(iommu, parent->bus->number,
|
||||
parent->devfn);
|
||||
parent = parent->bus->self;
|
||||
}
|
||||
if (pci_is_pcie(tmp)) /* this is a PCIe-to-PCI bridge */
|
||||
iommu_detach_dev(iommu,
|
||||
tmp->subordinate->number, 0);
|
||||
else /* this is a legacy PCI bridge */
|
||||
iommu_detach_dev(iommu, tmp->bus->number,
|
||||
tmp->devfn);
|
||||
}
|
||||
pci_for_each_dma_alias(to_pci_dev(dev), &iommu_detach_dev_cb, iommu);
|
||||
}
|
||||
|
||||
static void domain_remove_one_dev_info(struct dmar_domain *domain,
|
||||
|
@ -369,29 +369,52 @@ static int set_hpet_sid(struct irte *irte, u8 id)
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct set_msi_sid_data {
|
||||
struct pci_dev *pdev;
|
||||
u16 alias;
|
||||
};
|
||||
|
||||
static int set_msi_sid_cb(struct pci_dev *pdev, u16 alias, void *opaque)
|
||||
{
|
||||
struct set_msi_sid_data *data = opaque;
|
||||
|
||||
data->pdev = pdev;
|
||||
data->alias = alias;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int set_msi_sid(struct irte *irte, struct pci_dev *dev)
|
||||
{
|
||||
struct pci_dev *bridge;
|
||||
struct set_msi_sid_data data;
|
||||
|
||||
if (!irte || !dev)
|
||||
return -1;
|
||||
|
||||
/* PCIe device or Root Complex integrated PCI device */
|
||||
if (pci_is_pcie(dev) || !dev->bus->parent) {
|
||||
set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16,
|
||||
(dev->bus->number << 8) | dev->devfn);
|
||||
return 0;
|
||||
}
|
||||
pci_for_each_dma_alias(dev, set_msi_sid_cb, &data);
|
||||
|
||||
bridge = pci_find_upstream_pcie_bridge(dev);
|
||||
if (bridge) {
|
||||
if (pci_is_pcie(bridge))/* this is a PCIe-to-PCI/PCIX bridge */
|
||||
set_irte_sid(irte, SVT_VERIFY_BUS, SQ_ALL_16,
|
||||
(bridge->bus->number << 8) | dev->bus->number);
|
||||
else /* this is a legacy PCI bridge */
|
||||
set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16,
|
||||
(bridge->bus->number << 8) | bridge->devfn);
|
||||
}
|
||||
/*
|
||||
* DMA alias provides us with a PCI device and alias. The only case
|
||||
* where the it will return an alias on a different bus than the
|
||||
* device is the case of a PCIe-to-PCI bridge, where the alias is for
|
||||
* the subordinate bus. In this case we can only verify the bus.
|
||||
*
|
||||
* If the alias device is on a different bus than our source device
|
||||
* then we have a topology based alias, use it.
|
||||
*
|
||||
* Otherwise, the alias is for a device DMA quirk and we cannot
|
||||
* assume that MSI uses the same requester ID. Therefore use the
|
||||
* original device.
|
||||
*/
|
||||
if (PCI_BUS_NUM(data.alias) != data.pdev->bus->number)
|
||||
set_irte_sid(irte, SVT_VERIFY_BUS, SQ_ALL_16,
|
||||
PCI_DEVID(PCI_BUS_NUM(data.alias),
|
||||
dev->bus->number));
|
||||
else if (data.pdev->bus->number != dev->bus->number)
|
||||
set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16, data.alias);
|
||||
else
|
||||
set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16,
|
||||
PCI_DEVID(dev->bus->number, dev->devfn));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user