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iommu: Allow PCI to use IOMMU infrastructure

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This patch adds some hooks to let PCI devices and busses use the new IOMMU
infrastructure.  When IOMMU support is enabled, each PCI device now
contains a DMAContext * which is used by the pci_dma_*() wrapper functions.

By default, the contexts are initialized to NULL, assuming no IOMMU.
However the platform or host bridge code which sets up the PCI bus can use
pci_setup_iommu() to set a function which will determine the correct
DMAContext for a given PCI device.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
David Gibson 2012-06-27 14:50:45 +10:00 committed by Anthony Liguori
parent ad0ebb91cd
commit 5fa45de562
3 changed files with 18 additions and 2 deletions
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9
hw/pci.c
View file

@ -775,6 +775,9 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
return NULL;
}
pci_dev->bus = bus;
if (bus->dma_context_fn) {
pci_dev->dma = bus->dma_context_fn(bus, bus->dma_context_opaque, devfn);
}
pci_dev->devfn = devfn;
pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
pci_dev->irq_state = 0;
@ -2024,6 +2027,12 @@ static void pci_device_class_init(ObjectClass *klass, void *data)
k->props = pci_props;
}
void pci_setup_iommu(PCIBus *bus, PCIDMAContextFunc fn, void *opaque)
{
bus->dma_context_fn = fn;
bus->dma_context_opaque = opaque;
}
static TypeInfo pci_device_type_info = {
.name = TYPE_PCI_DEVICE,
.parent = TYPE_DEVICE,

9
hw/pci.h
View file

@ -179,6 +179,7 @@ typedef void (*MSIVectorReleaseNotifier)(PCIDevice *dev, unsigned int vector);
struct PCIDevice {
DeviceState qdev;
/* PCI config space */
uint8_t *config;
@ -200,6 +201,7 @@ struct PCIDevice {
int32_t devfn;
char name[64];
PCIIORegion io_regions[PCI_NUM_REGIONS];
DMAContext *dma;
/* do not access the following fields */
PCIConfigReadFunc *config_read;
@ -326,6 +328,10 @@ int pci_read_devaddr(Monitor *mon, const char *addr, int *domp, int *busp,
void pci_device_deassert_intx(PCIDevice *dev);
typedef DMAContext *(*PCIDMAContextFunc)(PCIBus *, void *, int);
void pci_setup_iommu(PCIBus *bus, PCIDMAContextFunc fn, void *opaque);
static inline void
pci_set_byte(uint8_t *config, uint8_t val)
{
@ -562,8 +568,7 @@ static inline uint32_t pci_config_size(const PCIDevice *d)
/* DMA access functions */
static inline DMAContext *pci_dma_context(PCIDevice *dev)
{
/* Stub for when we have no PCI iommu support */
return NULL;
return dev->dma;
}
static inline int pci_dma_rw(PCIDevice *dev, dma_addr_t addr,

2
hw/pci_internals.h
View file

@ -17,6 +17,8 @@
struct PCIBus {
BusState qbus;
PCIDMAContextFunc dma_context_fn;
void *dma_context_opaque;
uint8_t devfn_min;
pci_set_irq_fn set_irq;
pci_map_irq_fn map_irq;