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pci: add API to add capability at a known offset 

Unlike virtio, device emulations need to add pci capabilities
at known offsets to match real hardware. Make this possible
by adding an appropriate API.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2010-04-06 16:05:46 +03:00
parent f62719ca6f
commit 1db5a3aad3
2 changed files with 15 additions and 4 deletions
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17
hw/pci.c
View File

@ -1789,12 +1789,10 @@ static int pci_add_option_rom(PCIDevice *pdev)
}
/* Reserve space and add capability to the linked list in pci config space */
int pci_add_capability(PCIDevice *pdev, uint8_t cap_id, uint8_t size)
int pci_add_capability_at_offset(PCIDevice *pdev, uint8_t cap_id,
uint8_t offset, uint8_t size)
{
uint8_t offset = pci_find_space(pdev, size);
uint8_t *config = pdev->config + offset;
if (!offset)
return -ENOSPC;
config[PCI_CAP_LIST_ID] = cap_id;
config[PCI_CAP_LIST_NEXT] = pdev->config[PCI_CAPABILITY_LIST];
pdev->config[PCI_CAPABILITY_LIST] = offset;
@ -1807,6 +1805,17 @@ int pci_add_capability(PCIDevice *pdev, uint8_t cap_id, uint8_t size)
return offset;
}
/* Find and reserve space and add capability to the linked list
* in pci config space */
int pci_add_capability(PCIDevice *pdev, uint8_t cap_id, uint8_t size)
{
uint8_t offset = pci_find_space(pdev, size);
if (!offset) {
return -ENOSPC;
}
return pci_add_capability_at_offset(pdev, cap_id, offset, size);
}
/* Unlink capability from the pci config space. */
void pci_del_capability(PCIDevice *pdev, uint8_t cap_id, uint8_t size)
{

2
hw/pci.h
View File

@ -190,6 +190,8 @@ void pci_register_bar(PCIDevice *pci_dev, int region_num,
PCIMapIORegionFunc *map_func);
int pci_add_capability(PCIDevice *pci_dev, uint8_t cap_id, uint8_t cap_size);
int pci_add_capability_at_offset(PCIDevice *pci_dev, uint8_t cap_id,
uint8_t cap_offset, uint8_t cap_size);
void pci_del_capability(PCIDevice *pci_dev, uint8_t cap_id, uint8_t cap_size);