diff options
author | Michael S. Tsirkin <mst@redhat.com> | 2012-02-15 19:17:59 +0200 |
---|---|---|
committer | Michael S. Tsirkin <mst@redhat.com> | 2012-03-16 00:41:28 +0200 |
commit | 762833b3b88b7b79af442439a8b138a04786ec3d (patch) | |
tree | c99b8c3ff00ae1fe814b5bc9d5e36020ff7dbf55 /hw/slotid_cap.c | |
parent | 1dc324d20f7404fd6a416f16c2cb9a4ec50a4dd7 (diff) |
slotid: add slot id capability
This capability makes it possible for the guest to
report a unique chassis identifier to the user.
The spec also recommends making chassis indentifier
persist in eeprom.
This isn't implemented.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/slotid_cap.c')
-rw-r--r-- | hw/slotid_cap.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/hw/slotid_cap.c b/hw/slotid_cap.c new file mode 100644 index 0000000000..01064521a9 --- /dev/null +++ b/hw/slotid_cap.c @@ -0,0 +1,44 @@ +#include "slotid_cap.h" +#include "pci.h" + +#define SLOTID_CAP_LENGTH 4 +#define SLOTID_NSLOTS_SHIFT (ffs(PCI_SID_ESR_NSLOTS) - 1) + +int slotid_cap_init(PCIDevice *d, int nslots, + uint8_t chassis, + unsigned offset) +{ + int cap; + if (!chassis) { + error_report("Bridge chassis not specified. Each bridge is required " + "to be assigned a unique chassis id > 0."); + return -EINVAL; + } + if (nslots < 0 || nslots > (PCI_SID_ESR_NSLOTS >> SLOTID_NSLOTS_SHIFT)) { + /* TODO: error report? */ + return -EINVAL; + } + + cap = pci_add_capability(d, PCI_CAP_ID_SLOTID, offset, SLOTID_CAP_LENGTH); + if (cap < 0) { + return cap; + } + /* We make each chassis unique, this way each bridge is First in Chassis */ + d->config[cap + PCI_SID_ESR] = PCI_SID_ESR_FIC | + (nslots << SLOTID_NSLOTS_SHIFT); + d->cmask[cap + PCI_SID_ESR] = 0xff; + d->config[cap + PCI_SID_CHASSIS_NR] = chassis; + /* Note: Chassis number register is non-volatile, + so we don't reset it. */ + /* TODO: store in eeprom? */ + d->wmask[cap + PCI_SID_CHASSIS_NR] = 0xff; + + d->cap_present |= QEMU_PCI_CAP_SLOTID; + return 0; +} + +void slotid_cap_cleanup(PCIDevice *d) +{ + /* TODO: cleanup config space? */ + d->cap_present &= ~QEMU_PCI_CAP_SLOTID; +} |