qemu/hw/spapr_vty.c
Alexey Kardashevskiy a307d59434 pseries: Rework irq assignment to avoid carrying qemu_irqs around
Currently, the interfaces in the pseries machine code for assignment
and setup of interrupts pass around qemu_irq objects.  That was done
in an attempt not to be too closely linked to the specific XICS
interrupt controller.  However interactions with the device tree setup
made that attempt rather futile, and XICS is part of the PAPR spec
anyway, so this really just meant we had to carry both the qemu_irq
pointers and the XICS irq numbers around.

This mess will just get worse when we add upcoming PCI MSI support,
since that will require tracking a bunch more interrupt.  Therefore,
this patch reworks the spapr code to just use XICS irq numbers
(roughly equivalent to GSIs on x86) and only retrieve the qemu_irq
pointers from the XICS code when we need them (a trivial lookup).

This is a reworked and generalized version of an earlier spapr_pci
specific patch from Alexey Kardashevskiy.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
[agraf: fix checkpath warning]
Signed-off-by: Alexander Graf <agraf@suse.de>
2012-08-15 19:43:16 +02:00

222 lines
5.7 KiB
C

#include "qdev.h"
#include "qemu-char.h"
#include "hw/spapr.h"
#include "hw/spapr_vio.h"
#define VTERM_BUFSIZE 16
typedef struct VIOsPAPRVTYDevice {
VIOsPAPRDevice sdev;
CharDriverState *chardev;
uint32_t in, out;
uint8_t buf[VTERM_BUFSIZE];
} VIOsPAPRVTYDevice;
static int vty_can_receive(void *opaque)
{
VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;
return (dev->in - dev->out) < VTERM_BUFSIZE;
}
static void vty_receive(void *opaque, const uint8_t *buf, int size)
{
VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;
int i;
if ((dev->in == dev->out) && size) {
/* toggle line to simulate edge interrupt */
qemu_irq_pulse(spapr_vio_qirq(&dev->sdev));
}
for (i = 0; i < size; i++) {
assert((dev->in - dev->out) < VTERM_BUFSIZE);
dev->buf[dev->in++ % VTERM_BUFSIZE] = buf[i];
}
}
static int vty_getchars(VIOsPAPRDevice *sdev, uint8_t *buf, int max)
{
VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
int n = 0;
while ((n < max) && (dev->out != dev->in)) {
buf[n++] = dev->buf[dev->out++ % VTERM_BUFSIZE];
}
return n;
}
void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len)
{
VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
/* FIXME: should check the qemu_chr_fe_write() return value */
qemu_chr_fe_write(dev->chardev, buf, len);
}
static int spapr_vty_init(VIOsPAPRDevice *sdev)
{
VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
if (!dev->chardev) {
fprintf(stderr, "spapr-vty: Can't create vty without a chardev!\n");
exit(1);
}
qemu_chr_add_handlers(dev->chardev, vty_can_receive,
vty_receive, NULL, dev);
return 0;
}
/* Forward declaration */
static target_ulong h_put_term_char(CPUPPCState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
target_ulong len = args[1];
target_ulong char0_7 = args[2];
target_ulong char8_15 = args[3];
VIOsPAPRDevice *sdev;
uint8_t buf[16];
sdev = vty_lookup(spapr, reg);
if (!sdev) {
return H_PARAMETER;
}
if (len > 16) {
return H_PARAMETER;
}
*((uint64_t *)buf) = cpu_to_be64(char0_7);
*((uint64_t *)buf + 1) = cpu_to_be64(char8_15);
vty_putchars(sdev, buf, len);
return H_SUCCESS;
}
static target_ulong h_get_term_char(CPUPPCState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
target_ulong *len = args + 0;
target_ulong *char0_7 = args + 1;
target_ulong *char8_15 = args + 2;
VIOsPAPRDevice *sdev;
uint8_t buf[16];
sdev = vty_lookup(spapr, reg);
if (!sdev) {
return H_PARAMETER;
}
*len = vty_getchars(sdev, buf, sizeof(buf));
if (*len < 16) {
memset(buf + *len, 0, 16 - *len);
}
*char0_7 = be64_to_cpu(*((uint64_t *)buf));
*char8_15 = be64_to_cpu(*((uint64_t *)buf + 1));
return H_SUCCESS;
}
void spapr_vty_create(VIOsPAPRBus *bus, CharDriverState *chardev)
{
DeviceState *dev;
dev = qdev_create(&bus->bus, "spapr-vty");
qdev_prop_set_chr(dev, "chardev", chardev);
qdev_init_nofail(dev);
}
static Property spapr_vty_properties[] = {
DEFINE_SPAPR_PROPERTIES(VIOsPAPRVTYDevice, sdev),
DEFINE_PROP_CHR("chardev", VIOsPAPRVTYDevice, chardev),
DEFINE_PROP_END_OF_LIST(),
};
static void spapr_vty_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
k->init = spapr_vty_init;
k->dt_name = "vty";
k->dt_type = "serial";
k->dt_compatible = "hvterm1";
dc->props = spapr_vty_properties;
}
static TypeInfo spapr_vty_info = {
.name = "spapr-vty",
.parent = TYPE_VIO_SPAPR_DEVICE,
.instance_size = sizeof(VIOsPAPRVTYDevice),
.class_init = spapr_vty_class_init,
};
VIOsPAPRDevice *spapr_vty_get_default(VIOsPAPRBus *bus)
{
VIOsPAPRDevice *sdev, *selected;
BusChild *kid;
/*
* To avoid the console bouncing around we want one VTY to be
* the "default". We haven't really got anything to go on, so
* arbitrarily choose the one with the lowest reg value.
*/
selected = NULL;
QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
DeviceState *iter = kid->child;
/* Only look at VTY devices */
if (!object_dynamic_cast(OBJECT(iter), "spapr-vty")) {
continue;
}
sdev = DO_UPCAST(VIOsPAPRDevice, qdev, iter);
/* First VTY we've found, so it is selected for now */
if (!selected) {
selected = sdev;
continue;
}
/* Choose VTY with lowest reg value */
if (sdev->reg < selected->reg) {
selected = sdev;
}
}
return selected;
}
VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg)
{
VIOsPAPRDevice *sdev;
sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
if (!sdev && reg == 0) {
/* Hack for kernel early debug, which always specifies reg==0.
* We search all VIO devices, and grab the vty with the lowest
* reg. This attempts to mimic existing PowerVM behaviour
* (early debug does work there, despite having no vty with
* reg==0. */
return spapr_vty_get_default(spapr->vio_bus);
}
return sdev;
}
static void spapr_vty_register_types(void)
{
spapr_register_hypercall(H_PUT_TERM_CHAR, h_put_term_char);
spapr_register_hypercall(H_GET_TERM_CHAR, h_get_term_char);
type_register_static(&spapr_vty_info);
}
type_init(spapr_vty_register_types)