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authorMichael S. Tsirkin <mst@redhat.com>2012-02-15 19:17:59 +0200
committerMichael S. Tsirkin <mst@redhat.com>2012-03-16 00:41:28 +0200
commit762833b3b88b7b79af442439a8b138a04786ec3d (patch)
treec99b8c3ff00ae1fe814b5bc9d5e36020ff7dbf55 /hw/slotid_cap.c
parent1dc324d20f7404fd6a416f16c2cb9a4ec50a4dd7 (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.c44
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;
+}