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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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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);
}
}