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pci: honor PCI_COMMAND_MASTER 

Currently we ignore PCI_COMMAND_MASTER completely: DMA succeeds even when
the bit is clear.

Honor PCI_COMMAND_MASTER by inserting a memory region into the device's
bus master address space, and tying its enable status to PCI_COMMAND_MASTER.

Tested using

  setpci -s 03 COMMAND=3

while a ping was running on a NIC in slot 3.  The kernel (Linux) detected
the stall and recovered after the command

  setpci -s 03 COMMAND=7

was issued.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2012-10-03 17:42:58 +02:00
parent 817dcc5368
commit 1c380f9460
2 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
hw/pci.c
View File

@ -782,7 +782,11 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
/* FIXME: Make dma_context_fn use MemoryRegions instead, so this path is
* taken unconditionally */
/* FIXME: inherit memory region from bus creator */
address_space_init(&pci_dev->bus_master_as, get_system_memory());
memory_region_init_alias(&pci_dev->bus_master_enable_region, "bus master",
get_system_memory(), 0,
memory_region_size(get_system_memory()));
memory_region_set_enabled(&pci_dev->bus_master_enable_region, false);
address_space_init(&pci_dev->bus_master_as, &pci_dev->bus_master_enable_region);
pci_dev->dma = g_new(DMAContext, 1);
dma_context_init(pci_dev->dma, &pci_dev->bus_master_as, NULL, NULL, NULL);
}
@ -841,6 +845,7 @@ static void do_pci_unregister_device(PCIDevice *pci_dev)
if (!pci_dev->bus->dma_context_fn) {
address_space_destroy(&pci_dev->bus_master_as);
memory_region_destroy(&pci_dev->bus_master_enable_region);
g_free(pci_dev->dma);
pci_dev->dma = NULL;
}
@ -1065,8 +1070,12 @@ void pci_default_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int l)
range_covers_byte(addr, l, PCI_COMMAND))
pci_update_mappings(d);
if (range_covers_byte(addr, l, PCI_COMMAND))
if (range_covers_byte(addr, l, PCI_COMMAND)) {
pci_update_irq_disabled(d, was_irq_disabled);
memory_region_set_enabled(&d->bus_master_enable_region,
pci_get_word(d->config + PCI_COMMAND)
& PCI_COMMAND_MASTER);
}
msi_write_config(d, addr, val, l);
msix_write_config(d, addr, val, l);

1
hw/pci.h
View File

@ -212,6 +212,7 @@ struct PCIDevice {
char name[64];
PCIIORegion io_regions[PCI_NUM_REGIONS];
AddressSpace bus_master_as;
MemoryRegion bus_master_enable_region;
DMAContext *dma;
/* do not access the following fields */