352 lines
7.7 KiB
C
352 lines
7.7 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/*
|
||
|
|
* Copyright 2011 IBM Corporation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/irq.h>
|
||
|
|
#include <linux/irqdomain.h>
|
||
|
|
#include <linux/smp.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/cpu.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/of_address.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
|
||
|
|
#include <asm/io.h>
|
||
|
|
#include <asm/smp.h>
|
||
|
|
#include <asm/irq.h>
|
||
|
|
#include <asm/errno.h>
|
||
|
|
#include <asm/xics.h>
|
||
|
|
#include <asm/kvm_ppc.h>
|
||
|
|
#include <asm/dbell.h>
|
||
|
|
|
||
|
|
struct icp_ipl {
|
||
|
|
union {
|
||
|
|
u32 word;
|
||
|
|
u8 bytes[4];
|
||
|
|
} xirr_poll;
|
||
|
|
union {
|
||
|
|
u32 word;
|
||
|
|
u8 bytes[4];
|
||
|
|
} xirr;
|
||
|
|
u32 dummy;
|
||
|
|
union {
|
||
|
|
u32 word;
|
||
|
|
u8 bytes[4];
|
||
|
|
} qirr;
|
||
|
|
u32 link_a;
|
||
|
|
u32 link_b;
|
||
|
|
u32 link_c;
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct icp_ipl __iomem *icp_native_regs[NR_CPUS];
|
||
|
|
|
||
|
|
static inline unsigned int icp_native_get_xirr(void)
|
||
|
|
{
|
||
|
|
int cpu = smp_processor_id();
|
||
|
|
unsigned int xirr;
|
||
|
|
|
||
|
|
/* Handled an interrupt latched by KVM */
|
||
|
|
xirr = kvmppc_get_xics_latch();
|
||
|
|
if (xirr)
|
||
|
|
return xirr;
|
||
|
|
|
||
|
|
return in_be32(&icp_native_regs[cpu]->xirr.word);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void icp_native_set_xirr(unsigned int value)
|
||
|
|
{
|
||
|
|
int cpu = smp_processor_id();
|
||
|
|
|
||
|
|
out_be32(&icp_native_regs[cpu]->xirr.word, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void icp_native_set_cppr(u8 value)
|
||
|
|
{
|
||
|
|
int cpu = smp_processor_id();
|
||
|
|
|
||
|
|
out_8(&icp_native_regs[cpu]->xirr.bytes[0], value);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void icp_native_set_qirr(int n_cpu, u8 value)
|
||
|
|
{
|
||
|
|
out_8(&icp_native_regs[n_cpu]->qirr.bytes[0], value);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void icp_native_set_cpu_priority(unsigned char cppr)
|
||
|
|
{
|
||
|
|
xics_set_base_cppr(cppr);
|
||
|
|
icp_native_set_cppr(cppr);
|
||
|
|
iosync();
|
||
|
|
}
|
||
|
|
|
||
|
|
void icp_native_eoi(struct irq_data *d)
|
||
|
|
{
|
||
|
|
unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
|
||
|
|
|
||
|
|
iosync();
|
||
|
|
icp_native_set_xirr((xics_pop_cppr() << 24) | hw_irq);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void icp_native_teardown_cpu(void)
|
||
|
|
{
|
||
|
|
int cpu = smp_processor_id();
|
||
|
|
|
||
|
|
/* Clear any pending IPI */
|
||
|
|
icp_native_set_qirr(cpu, 0xff);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void icp_native_flush_ipi(void)
|
||
|
|
{
|
||
|
|
/* We take the ipi irq but and never return so we
|
||
|
|
* need to EOI the IPI, but want to leave our priority 0
|
||
|
|
*
|
||
|
|
* should we check all the other interrupts too?
|
||
|
|
* should we be flagging idle loop instead?
|
||
|
|
* or creating some task to be scheduled?
|
||
|
|
*/
|
||
|
|
|
||
|
|
icp_native_set_xirr((0x00 << 24) | XICS_IPI);
|
||
|
|
}
|
||
|
|
|
||
|
|
static unsigned int icp_native_get_irq(void)
|
||
|
|
{
|
||
|
|
unsigned int xirr = icp_native_get_xirr();
|
||
|
|
unsigned int vec = xirr & 0x00ffffff;
|
||
|
|
unsigned int irq;
|
||
|
|
|
||
|
|
if (vec == XICS_IRQ_SPURIOUS)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
irq = irq_find_mapping(xics_host, vec);
|
||
|
|
if (likely(irq)) {
|
||
|
|
xics_push_cppr(vec);
|
||
|
|
return irq;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* We don't have a linux mapping, so have rtas mask it. */
|
||
|
|
xics_mask_unknown_vec(vec);
|
||
|
|
|
||
|
|
/* We might learn about it later, so EOI it */
|
||
|
|
icp_native_set_xirr(xirr);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_SMP
|
||
|
|
|
||
|
|
static void icp_native_cause_ipi(int cpu)
|
||
|
|
{
|
||
|
|
kvmppc_set_host_ipi(cpu);
|
||
|
|
icp_native_set_qirr(cpu, IPI_PRIORITY);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
|
||
|
|
void icp_native_cause_ipi_rm(int cpu)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Currently not used to send IPIs to another CPU
|
||
|
|
* on the same core. Only caller is KVM real mode.
|
||
|
|
* Need the physical address of the XICS to be
|
||
|
|
* previously saved in kvm_hstate in the paca.
|
||
|
|
*/
|
||
|
|
void __iomem *xics_phys;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Just like the cause_ipi functions, it is required to
|
||
|
|
* include a full barrier before causing the IPI.
|
||
|
|
*/
|
||
|
|
xics_phys = paca_ptrs[cpu]->kvm_hstate.xics_phys;
|
||
|
|
mb();
|
||
|
|
__raw_rm_writeb(IPI_PRIORITY, xics_phys + XICS_MFRR);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Called when an interrupt is received on an off-line CPU to
|
||
|
|
* clear the interrupt, so that the CPU can go back to nap mode.
|
||
|
|
*/
|
||
|
|
void icp_native_flush_interrupt(void)
|
||
|
|
{
|
||
|
|
unsigned int xirr = icp_native_get_xirr();
|
||
|
|
unsigned int vec = xirr & 0x00ffffff;
|
||
|
|
|
||
|
|
if (vec == XICS_IRQ_SPURIOUS)
|
||
|
|
return;
|
||
|
|
if (vec == XICS_IPI) {
|
||
|
|
/* Clear pending IPI */
|
||
|
|
int cpu = smp_processor_id();
|
||
|
|
kvmppc_clear_host_ipi(cpu);
|
||
|
|
icp_native_set_qirr(cpu, 0xff);
|
||
|
|
} else {
|
||
|
|
pr_err("XICS: hw interrupt 0x%x to offline cpu, disabling\n",
|
||
|
|
vec);
|
||
|
|
xics_mask_unknown_vec(vec);
|
||
|
|
}
|
||
|
|
/* EOI the interrupt */
|
||
|
|
icp_native_set_xirr(xirr);
|
||
|
|
}
|
||
|
|
|
||
|
|
void xics_wake_cpu(int cpu)
|
||
|
|
{
|
||
|
|
icp_native_set_qirr(cpu, IPI_PRIORITY);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(xics_wake_cpu);
|
||
|
|
|
||
|
|
static irqreturn_t icp_native_ipi_action(int irq, void *dev_id)
|
||
|
|
{
|
||
|
|
int cpu = smp_processor_id();
|
||
|
|
|
||
|
|
kvmppc_clear_host_ipi(cpu);
|
||
|
|
icp_native_set_qirr(cpu, 0xff);
|
||
|
|
|
||
|
|
return smp_ipi_demux();
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* CONFIG_SMP */
|
||
|
|
|
||
|
|
static int __init icp_native_map_one_cpu(int hw_id, unsigned long addr,
|
||
|
|
unsigned long size)
|
||
|
|
{
|
||
|
|
char *rname;
|
||
|
|
int i, cpu = -1;
|
||
|
|
|
||
|
|
/* This may look gross but it's good enough for now, we don't quite
|
||
|
|
* have a hard -> linux processor id matching.
|
||
|
|
*/
|
||
|
|
for_each_possible_cpu(i) {
|
||
|
|
if (!cpu_present(i))
|
||
|
|
continue;
|
||
|
|
if (hw_id == get_hard_smp_processor_id(i)) {
|
||
|
|
cpu = i;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Fail, skip that CPU. Don't print, it's normal, some XICS come up
|
||
|
|
* with way more entries in there than you have CPUs
|
||
|
|
*/
|
||
|
|
if (cpu == -1)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
rname = kasprintf(GFP_KERNEL, "CPU %d [0x%x] Interrupt Presentation",
|
||
|
|
cpu, hw_id);
|
||
|
|
|
||
|
|
if (!request_mem_region(addr, size, rname)) {
|
||
|
|
pr_warn("icp_native: Could not reserve ICP MMIO for CPU %d, interrupt server #0x%x\n",
|
||
|
|
cpu, hw_id);
|
||
|
|
return -EBUSY;
|
||
|
|
}
|
||
|
|
|
||
|
|
icp_native_regs[cpu] = ioremap(addr, size);
|
||
|
|
kvmppc_set_xics_phys(cpu, addr);
|
||
|
|
if (!icp_native_regs[cpu]) {
|
||
|
|
pr_warn("icp_native: Failed ioremap for CPU %d, interrupt server #0x%x, addr %#lx\n",
|
||
|
|
cpu, hw_id, addr);
|
||
|
|
release_mem_region(addr, size);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init icp_native_init_one_node(struct device_node *np,
|
||
|
|
unsigned int *indx)
|
||
|
|
{
|
||
|
|
unsigned int ilen;
|
||
|
|
const __be32 *ireg;
|
||
|
|
int i;
|
||
|
|
int reg_tuple_size;
|
||
|
|
int num_servers = 0;
|
||
|
|
|
||
|
|
/* This code does the theorically broken assumption that the interrupt
|
||
|
|
* server numbers are the same as the hard CPU numbers.
|
||
|
|
* This happens to be the case so far but we are playing with fire...
|
||
|
|
* should be fixed one of these days. -BenH.
|
||
|
|
*/
|
||
|
|
ireg = of_get_property(np, "ibm,interrupt-server-ranges", &ilen);
|
||
|
|
|
||
|
|
/* Do that ever happen ? we'll know soon enough... but even good'old
|
||
|
|
* f80 does have that property ..
|
||
|
|
*/
|
||
|
|
WARN_ON((ireg == NULL) || (ilen != 2*sizeof(u32)));
|
||
|
|
|
||
|
|
if (ireg) {
|
||
|
|
*indx = of_read_number(ireg, 1);
|
||
|
|
if (ilen >= 2*sizeof(u32))
|
||
|
|
num_servers = of_read_number(ireg + 1, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
ireg = of_get_property(np, "reg", &ilen);
|
||
|
|
if (!ireg) {
|
||
|
|
pr_err("icp_native: Can't find interrupt reg property");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
reg_tuple_size = (of_n_addr_cells(np) + of_n_size_cells(np)) * 4;
|
||
|
|
if (((ilen % reg_tuple_size) != 0)
|
||
|
|
|| (num_servers && (num_servers != (ilen / reg_tuple_size)))) {
|
||
|
|
pr_err("icp_native: ICP reg len (%d) != num servers (%d)",
|
||
|
|
ilen / reg_tuple_size, num_servers);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < (ilen / reg_tuple_size); i++) {
|
||
|
|
struct resource r;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = of_address_to_resource(np, i, &r);
|
||
|
|
if (err) {
|
||
|
|
pr_err("icp_native: Could not translate ICP MMIO"
|
||
|
|
" for interrupt server 0x%x (%d)\n", *indx, err);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (icp_native_map_one_cpu(*indx, r.start, resource_size(&r)))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
(*indx)++;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct icp_ops icp_native_ops = {
|
||
|
|
.get_irq = icp_native_get_irq,
|
||
|
|
.eoi = icp_native_eoi,
|
||
|
|
.set_priority = icp_native_set_cpu_priority,
|
||
|
|
.teardown_cpu = icp_native_teardown_cpu,
|
||
|
|
.flush_ipi = icp_native_flush_ipi,
|
||
|
|
#ifdef CONFIG_SMP
|
||
|
|
.ipi_action = icp_native_ipi_action,
|
||
|
|
.cause_ipi = icp_native_cause_ipi,
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
int __init icp_native_init(void)
|
||
|
|
{
|
||
|
|
struct device_node *np;
|
||
|
|
u32 indx = 0;
|
||
|
|
int found = 0;
|
||
|
|
|
||
|
|
for_each_compatible_node(np, NULL, "ibm,ppc-xicp")
|
||
|
|
if (icp_native_init_one_node(np, &indx) == 0)
|
||
|
|
found = 1;
|
||
|
|
if (!found) {
|
||
|
|
for_each_node_by_type(np,
|
||
|
|
"PowerPC-External-Interrupt-Presentation") {
|
||
|
|
if (icp_native_init_one_node(np, &indx) == 0)
|
||
|
|
found = 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (found == 0)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
icp_ops = &icp_native_ops;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|