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ide: Update ide_drive_get to be HBA agnostic

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Instead of duplicating the logic for the if_ide
(bus,unit) mappings, rely on the blockdev layer
for managing those mappings for us, and use the
drive_get_by_index call instead.

This allows ide_drive_get to work for AHCI HBAs
as well, and can be used in the Q35 initialization.

Lastly, change the nature of the argument to
ide_drive_get so that represents the number of
total drives we can support, and not the total
number of buses. This will prevent array overflows
if the units-per-default-bus property ever needs
to be adjusted for compatibility reasons.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 1412187569-23452-5-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
John Snow 2014-10-01 14:19:27 -04:00 committed by Stefan Hajnoczi
parent 1602651833
commit d8f94e1bb2
12 changed files with 44 additions and 14 deletions
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17
blockdev.c
View File

@ -135,6 +135,23 @@ void blockdev_auto_del(BlockDriverState *bs)
}
}
/**
* Returns the current mapping of how many units per bus
* a particular interface can support.
*
* A positive integer indicates n units per bus.
* 0 implies the mapping has not been established.
* -1 indicates an invalid BlockInterfaceType was given.
*/
int drive_get_max_devs(BlockInterfaceType type)
{
if (type >= IF_IDE && type < IF_COUNT) {
return if_max_devs[type];
}
return -1;
}
static int drive_index_to_bus_id(BlockInterfaceType type, int index)
{
int max_devs = if_max_devs[type];

2
hw/alpha/dp264.c
View File

@ -97,7 +97,7 @@ static void clipper_init(MachineState *machine)
/* IDE disk setup. */
{
DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
ide_drive_get(hd, MAX_IDE_BUS);
ide_drive_get(hd, ARRAY_SIZE(hd));
pci_cmd646_ide_init(pci_bus, hd, 0);
}

2
hw/i386/pc_piix.c
View File

@ -239,7 +239,7 @@ static void pc_init1(MachineState *machine,
pc_nic_init(isa_bus, pci_bus);
ide_drive_get(hd, MAX_IDE_BUS);
ide_drive_get(hd, ARRAY_SIZE(hd));
if (pci_enabled) {
PCIDevice *dev;
if (xen_enabled()) {

22
hw/ide/core.c
View File

@ -2558,16 +2558,28 @@ const VMStateDescription vmstate_ide_bus = {
}
};
void ide_drive_get(DriveInfo **hd, int max_bus)
void ide_drive_get(DriveInfo **hd, int n)
{
int i;
int highest_bus = drive_get_max_bus(IF_IDE) + 1;
int max_devs = drive_get_max_devs(IF_IDE);
int n_buses = max_devs ? (n / max_devs) : n;
if (drive_get_max_bus(IF_IDE) >= max_bus) {
fprintf(stderr, "qemu: too many IDE bus: %d\n", max_bus);
/*
* Note: The number of actual buses available is not known.
* We compute this based on the size of the DriveInfo* array, n.
* If it is less than max_devs * <num_real_buses>,
* We will stop looking for drives prematurely instead of overfilling
* the array.
*/
if (highest_bus > n_buses) {
error_report("Too many IDE buses defined (%d > %d)",
highest_bus, n_buses);
exit(1);
}
for(i = 0; i < max_bus * MAX_IDE_DEVS; i++) {
hd[i] = drive_get(IF_IDE, i / MAX_IDE_DEVS, i % MAX_IDE_DEVS);
for (i = 0; i < n; i++) {
hd[i] = drive_get_by_index(IF_IDE, i);
}
}

2
hw/mips/mips_fulong2e.c
View File

@ -350,7 +350,7 @@ static void mips_fulong2e_init(MachineState *machine)
pci_bus = bonito_init((qemu_irq *)&(env->irq[2]));
/* South bridge */
ide_drive_get(hd, MAX_IDE_BUS);
ide_drive_get(hd, ARRAY_SIZE(hd));
isa_bus = vt82c686b_init(pci_bus, PCI_DEVFN(FULONG2E_VIA_SLOT, 0));
if (!isa_bus) {

2
hw/mips/mips_malta.c
View File

@ -1147,7 +1147,7 @@ void mips_malta_init(MachineState *machine)
pci_bus = gt64120_register(isa_irq);
/* Southbridge */
ide_drive_get(hd, MAX_IDE_BUS);
ide_drive_get(hd, ARRAY_SIZE(hd));
piix4_devfn = piix4_init(pci_bus, &isa_bus, 80);

2
hw/mips/mips_r4k.c
View File

@ -294,7 +294,7 @@ void mips_r4k_init(MachineState *machine)
if (nd_table[0].used)
isa_ne2000_init(isa_bus, 0x300, 9, &nd_table[0]);
ide_drive_get(hd, MAX_IDE_BUS);
ide_drive_get(hd, ARRAY_SIZE(hd));
for(i = 0; i < MAX_IDE_BUS; i++)
isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i], ide_irq[i],
hd[MAX_IDE_DEVS * i],

2
hw/ppc/mac_newworld.c
View File

@ -400,7 +400,7 @@ static void ppc_core99_init(MachineState *machine)
macio_init(macio, pic_mem, escc_bar);
/* We only emulate 2 out of 3 IDE controllers for now */
ide_drive_get(hd, MAX_IDE_BUS);
ide_drive_get(hd, ARRAY_SIZE(hd));
macio_ide = MACIO_IDE(object_resolve_path_component(OBJECT(macio),
"ide[0]"));

2
hw/ppc/mac_oldworld.c
View File

@ -278,7 +278,7 @@ static void ppc_heathrow_init(MachineState *machine)
pci_nic_init_nofail(&nd_table[i], pci_bus, "ne2k_pci", NULL);
ide_drive_get(hd, MAX_IDE_BUS);
ide_drive_get(hd, ARRAY_SIZE(hd));
macio = pci_create(pci_bus, -1, TYPE_OLDWORLD_MACIO);
dev = DEVICE(macio);

2
hw/ppc/prep.c
View File

@ -519,7 +519,7 @@ static void ppc_prep_init(MachineState *machine)
}
}
ide_drive_get(hd, MAX_IDE_BUS);
ide_drive_get(hd, ARRAY_SIZE(hd));
for(i = 0; i < MAX_IDE_BUS; i++) {
isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i], ide_irq[i],
hd[2 * i],

2
hw/sparc64/sun4u.c
View File

@ -864,7 +864,7 @@ static void sun4uv_init(MemoryRegion *address_space_mem,
for(i = 0; i < nb_nics; i++)
pci_nic_init_nofail(&nd_table[i], pci_bus, "ne2k_pci", NULL);
ide_drive_get(hd, MAX_IDE_BUS);
ide_drive_get(hd, ARRAY_SIZE(hd));
pci_cmd646_ide_init(pci_bus, hd, 1);

1
include/sysemu/blockdev.h
View File

@ -52,6 +52,7 @@ DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit);
bool drive_check_orphaned(void);
DriveInfo *drive_get_by_index(BlockInterfaceType type, int index);
int drive_get_max_bus(BlockInterfaceType type);
int drive_get_max_devs(BlockInterfaceType type);
DriveInfo *drive_get_next(BlockInterfaceType type);
DriveInfo *drive_get_by_blockdev(BlockDriverState *bs);