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pci: acpi: ensure that acpi-index is unique 

it helps to avoid device naming conflicts when guest OS is
configured to use acpi-index for naming.
Spec ialso says so:

PCI Firmware Specification Revision 3.2
4.6.7.  _DSM for Naming a PCI or PCI Express Device Under Operating Systems
"
Instance number must be unique under \_SB scope. This instance number does not have to
be sequential in a given system configuration.
"

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20210315180102.3008391-4-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2021-03-15 14:00:59 -04:00 committed by Michael S. Tsirkin
parent b32bd763a1
commit 4fd7da4c03
1 changed files with 46 additions and 0 deletions
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46
hw/acpi/pcihp.c
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@ -52,6 +52,21 @@ typedef struct AcpiPciHpFind {
PCIBus *bus;
} AcpiPciHpFind;
static gint g_cmp_uint32(gconstpointer a, gconstpointer b, gpointer user_data)
{
return a - b;
}
static GSequence *pci_acpi_index_list(void)
{
static GSequence *used_acpi_index_list;
if (!used_acpi_index_list) {
used_acpi_index_list = g_sequence_new(NULL);
}
return used_acpi_index_list;
}
static int acpi_pcihp_get_bsel(PCIBus *bus)
{
Error *local_err = NULL;
@ -277,6 +292,23 @@ void acpi_pcihp_device_pre_plug_cb(HotplugHandler *hotplug_dev,
ONBOARD_INDEX_MAX);
return;
}
/*
* make sure that acpi-index is unique across all present PCI devices
*/
if (pdev->acpi_index) {
GSequence *used_indexes = pci_acpi_index_list();
if (g_sequence_lookup(used_indexes, GINT_TO_POINTER(pdev->acpi_index),
g_cmp_uint32, NULL)) {
error_setg(errp, "a PCI device with acpi-index = %" PRIu32
" already exist", pdev->acpi_index);
return;
}
g_sequence_insert_sorted(used_indexes,
GINT_TO_POINTER(pdev->acpi_index),
g_cmp_uint32, NULL);
}
}
void acpi_pcihp_device_plug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
@ -315,8 +347,22 @@ void acpi_pcihp_device_plug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
void acpi_pcihp_device_unplug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
DeviceState *dev, Error **errp)
{
PCIDevice *pdev = PCI_DEVICE(dev);
trace_acpi_pci_unplug(PCI_SLOT(PCI_DEVICE(dev)->devfn),
acpi_pcihp_get_bsel(pci_get_bus(PCI_DEVICE(dev))));
/*
* clean up acpi-index so it could reused by another device
*/
if (pdev->acpi_index) {
GSequence *used_indexes = pci_acpi_index_list();
g_sequence_remove(g_sequence_lookup(used_indexes,
GINT_TO_POINTER(pdev->acpi_index),
g_cmp_uint32, NULL));
}
qdev_unrealize(dev);
}