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spapr: introduce a fixed IRQ number space

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This proposal introduces a new IRQ number space layout using static
numbers for all devices, depending on a device index, and a bitmap
allocator for the MSI IRQ numbers which are negotiated by the guest at
runtime.

As the VIO device model does not have a device index but a "reg"
property, we introduce a formula to compute an IRQ number from a "reg"
value. It should minimize most of the collisions.

The previous layout is kept in pre-3.1 machines raising the
'legacy_irq_allocation' machine class flag.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Cédric Le Goater 2018-07-30 16:11:32 +02:00 • committed by David Gibson
parent d45360d93d
commit 82cffa2eb2
8 changed files with 216 additions and 18 deletions
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5
include/hw/ppc/spapr.h
View file

@ -8,6 +8,7 @@
#include "hw/ppc/spapr_drc.h"
#include "hw/mem/pc-dimm.h"
#include "hw/ppc/spapr_ovec.h"
#include "hw/ppc/spapr_irq.h"
struct VIOsPAPRBus;
struct sPAPRPHBState;
@ -101,6 +102,8 @@ struct sPAPRMachineClass {
bool dr_lmb_enabled; /* enable dynamic-reconfig/hotplug of LMBs */
bool use_ohci_by_default; /* use USB-OHCI instead of XHCI */
bool pre_2_10_has_unused_icps;
bool legacy_irq_allocation;
void (*phb_placement)(sPAPRMachineState *spapr, uint32_t index,
uint64_t *buid, hwaddr *pio,
hwaddr *mmio32, hwaddr *mmio64,
@ -167,6 +170,8 @@ struct sPAPRMachineState {
char *kvm_type;
const char *icp_type;
int32_t irq_map_nr;
unsigned long *irq_map;
bool cmd_line_caps[SPAPR_CAP_NUM];
sPAPRCapabilities def, eff, mig;