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spapr-pci: Enable huge BARs 

At the moment sPAPR only supports 512MB window for MMIO BARs. However
modern devices might want bigger 64bit BARs.

This extends MMIO window from 512MB to 62GB (aligned to
SPAPR_PCI_WINDOW_SPACING) and advertises it in 2 records in
the PHB "ranges" property. 32bit gets the space from
SPAPR_PCI_MEM_WIN_BUS_OFFSET till the end of 4GB, 64bit gets the rest
of the space. If no space is left, 64bit range is not advertised.

The MMIO space size is set to old value of 0x20000000 by default
for pseries machines older than 2.3.

The approach changes the device tree which is a guest visible change, however
it won't break migration as:
1. we do not support migration to older QEMU versions
2. migration to newer QEMU will migrate the device tree as well and since
the new layout only extends the old one and does not change address mappigns,
no breakage is expected here too.

SLOF change is required to utilize this extension.

Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexey Kardashevskiy 2015-01-30 12:53:19 +11:00 committed by Alexander Graf
parent 3dab024430
commit b194df478a
3 changed files with 32 additions and 5 deletions
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16
hw/ppc/spapr.c
View File

@ -1759,11 +1759,22 @@ static const TypeInfo spapr_machine_info = {
},
};
#define SPAPR_COMPAT_2_2 \
{\
.driver = TYPE_SPAPR_PCI_HOST_BRIDGE,\
.property = "mem_win_size",\
.value = "0x20000000",\
}
#define SPAPR_COMPAT_2_1 \
SPAPR_COMPAT_2_2
static void spapr_machine_2_1_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
static GlobalProperty compat_props[] = {
HW_COMPAT_2_1,
SPAPR_COMPAT_2_1,
{ /* end of list */ }
};
@ -1780,10 +1791,15 @@ static const TypeInfo spapr_machine_2_1_info = {
static void spapr_machine_2_2_class_init(ObjectClass *oc, void *data)
{
static GlobalProperty compat_props[] = {
SPAPR_COMPAT_2_2,
{ /* end of list */ }
};
MachineClass *mc = MACHINE_CLASS(oc);
mc->name = "pseries-2.2";
mc->desc = "pSeries Logical Partition (PAPR compliant) v2.2";
mc->compat_props = compat_props;
}
static const TypeInfo spapr_machine_2_2_info = {

14
hw/ppc/spapr_pci.c
View File

@ -868,6 +868,10 @@ int spapr_populate_pci_dt(sPAPRPHBState *phb,
int bus_off, i, j;
char nodename[256];
uint32_t bus_range[] = { cpu_to_be32(0), cpu_to_be32(0xff) };
const uint64_t mmiosize = memory_region_size(&phb->memwindow);
const uint64_t w32max = (1ULL << 32) - SPAPR_PCI_MEM_WIN_BUS_OFFSET;
const uint64_t w32size = MIN(w32max, mmiosize);
const uint64_t w64size = (mmiosize > w32size) ? (mmiosize - w32size) : 0;
struct {
uint32_t hi;
uint64_t child;
@ -882,9 +886,15 @@ int spapr_populate_pci_dt(sPAPRPHBState *phb,
{
cpu_to_be32(b_ss(2)), cpu_to_be64(SPAPR_PCI_MEM_WIN_BUS_OFFSET),
cpu_to_be64(phb->mem_win_addr),
cpu_to_be64(memory_region_size(&phb->memwindow)),
cpu_to_be64(w32size),
},
{
cpu_to_be32(b_ss(3)), cpu_to_be64(1ULL << 32),
cpu_to_be64(phb->mem_win_addr + w32size),
cpu_to_be64(w64size)
},
};
const unsigned sizeof_ranges = (w64size ? 3 : 2) * sizeof(ranges[0]);
uint64_t bus_reg[] = { cpu_to_be64(phb->buid), 0 };
uint32_t interrupt_map_mask[] = {
cpu_to_be32(b_ddddd(-1)|b_fff(0)), 0x0, 0x0, cpu_to_be32(-1)};
@ -913,7 +923,7 @@ int spapr_populate_pci_dt(sPAPRPHBState *phb,
_FDT(fdt_setprop_cell(fdt, bus_off, "#interrupt-cells", 0x1));
_FDT(fdt_setprop(fdt, bus_off, "used-by-rtas", NULL, 0));
_FDT(fdt_setprop(fdt, bus_off, "bus-range", &bus_range, sizeof(bus_range)));
_FDT(fdt_setprop(fdt, bus_off, "ranges", &ranges, sizeof(ranges)));
_FDT(fdt_setprop(fdt, bus_off, "ranges", &ranges, sizeof_ranges));
_FDT(fdt_setprop(fdt, bus_off, "reg", &bus_reg, sizeof(bus_reg)));
_FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pci-config-space-type", 0x1));
_FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pe-total-#msi", XICS_IRQS));

7
include/hw/pci-host/spapr.h
View File

@ -98,17 +98,18 @@ struct sPAPRPHBVFIOState {
#define SPAPR_PCI_BASE_BUID 0x800000020000000ULL
#define SPAPR_PCI_MEM_WIN_BUS_OFFSET 0x80000000ULL
#define SPAPR_PCI_WINDOW_BASE 0x10000000000ULL
#define SPAPR_PCI_WINDOW_SPACING 0x1000000000ULL
#define SPAPR_PCI_MMIO_WIN_OFF 0xA0000000
#define SPAPR_PCI_MMIO_WIN_SIZE 0x20000000
#define SPAPR_PCI_MMIO_WIN_SIZE (SPAPR_PCI_WINDOW_SPACING - \
SPAPR_PCI_MEM_WIN_BUS_OFFSET)
#define SPAPR_PCI_IO_WIN_OFF 0x80000000
#define SPAPR_PCI_IO_WIN_SIZE 0x10000
#define SPAPR_PCI_MSI_WINDOW 0x40000000000ULL
#define SPAPR_PCI_MEM_WIN_BUS_OFFSET 0x80000000ULL
static inline qemu_irq spapr_phb_lsi_qirq(struct sPAPRPHBState *phb, int pin)
{
return xics_get_qirq(spapr->icp, phb->lsi_table[pin].irq);