blob: ebc244b08d6748512c19199446d25f7ac49fca9b [file] [log] [blame]
/*
* Copyright 2016,2017 IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) "xive: " fmt
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/debugfs.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/cpumask.h>
#include <linux/mm.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/irq.h>
#include <asm/errno.h>
#include <asm/xive.h>
#include <asm/xive-regs.h>
#include <asm/opal.h>
#include <asm/kvm_ppc.h>
#include "xive-internal.h"
static u32 xive_provision_size;
static u32 *xive_provision_chips;
static u32 xive_provision_chip_count;
static u32 xive_queue_shift;
static u32 xive_pool_vps = XIVE_INVALID_VP;
static struct kmem_cache *xive_provision_cache;
int xive_native_populate_irq_data(u32 hw_irq, struct xive_irq_data *data)
{
__be64 flags, eoi_page, trig_page;
__be32 esb_shift, src_chip;
u64 opal_flags;
s64 rc;
memset(data, 0, sizeof(*data));
rc = opal_xive_get_irq_info(hw_irq, &flags, &eoi_page, &trig_page,
&esb_shift, &src_chip);
if (rc) {
pr_err("opal_xive_get_irq_info(0x%x) returned %lld\n",
hw_irq, rc);
return -EINVAL;
}
opal_flags = be64_to_cpu(flags);
if (opal_flags & OPAL_XIVE_IRQ_STORE_EOI)
data->flags |= XIVE_IRQ_FLAG_STORE_EOI;
if (opal_flags & OPAL_XIVE_IRQ_LSI)
data->flags |= XIVE_IRQ_FLAG_LSI;
if (opal_flags & OPAL_XIVE_IRQ_SHIFT_BUG)
data->flags |= XIVE_IRQ_FLAG_SHIFT_BUG;
if (opal_flags & OPAL_XIVE_IRQ_MASK_VIA_FW)
data->flags |= XIVE_IRQ_FLAG_MASK_FW;
if (opal_flags & OPAL_XIVE_IRQ_EOI_VIA_FW)
data->flags |= XIVE_IRQ_FLAG_EOI_FW;
data->eoi_page = be64_to_cpu(eoi_page);
data->trig_page = be64_to_cpu(trig_page);
data->esb_shift = be32_to_cpu(esb_shift);
data->src_chip = be32_to_cpu(src_chip);
data->eoi_mmio = ioremap(data->eoi_page, 1u << data->esb_shift);
if (!data->eoi_mmio) {
pr_err("Failed to map EOI page for irq 0x%x\n", hw_irq);
return -ENOMEM;
}
data->hw_irq = hw_irq;
if (!data->trig_page)
return 0;
if (data->trig_page == data->eoi_page) {
data->trig_mmio = data->eoi_mmio;
return 0;
}
data->trig_mmio = ioremap(data->trig_page, 1u << data->esb_shift);
if (!data->trig_mmio) {
pr_err("Failed to map trigger page for irq 0x%x\n", hw_irq);
return -ENOMEM;
}
return 0;
}
EXPORT_SYMBOL_GPL(xive_native_populate_irq_data);
int xive_native_configure_irq(u32 hw_irq, u32 target, u8 prio, u32 sw_irq)
{
s64 rc;
for (;;) {
rc = opal_xive_set_irq_config(hw_irq, target, prio, sw_irq);
if (rc != OPAL_BUSY)
break;
msleep(1);
}
return rc == 0 ? 0 : -ENXIO;
}
EXPORT_SYMBOL_GPL(xive_native_configure_irq);
/* This can be called multiple time to change a queue configuration */
int xive_native_configure_queue(u32 vp_id, struct xive_q *q, u8 prio,
__be32 *qpage, u32 order, bool can_escalate)
{
s64 rc = 0;
__be64 qeoi_page_be;
__be32 esc_irq_be;
u64 flags, qpage_phys;
/* If there's an actual queue page, clean it */
if (order) {
if (WARN_ON(!qpage))
return -EINVAL;
qpage_phys = __pa(qpage);
} else
qpage_phys = 0;
/* Initialize the rest of the fields */
q->msk = order ? ((1u << (order - 2)) - 1) : 0;
q->idx = 0;
q->toggle = 0;
rc = opal_xive_get_queue_info(vp_id, prio, NULL, NULL,
&qeoi_page_be,
&esc_irq_be,
NULL);
if (rc) {
pr_err("Error %lld getting queue info prio %d\n", rc, prio);
rc = -EIO;
goto fail;
}
q->eoi_phys = be64_to_cpu(qeoi_page_be);
/* Default flags */
flags = OPAL_XIVE_EQ_ALWAYS_NOTIFY | OPAL_XIVE_EQ_ENABLED;
/* Escalation needed ? */
if (can_escalate) {
q->esc_irq = be32_to_cpu(esc_irq_be);
flags |= OPAL_XIVE_EQ_ESCALATE;
}
/* Configure and enable the queue in HW */
for (;;) {
rc = opal_xive_set_queue_info(vp_id, prio, qpage_phys, order, flags);
if (rc != OPAL_BUSY)
break;
msleep(1);
}
if (rc) {
pr_err("Error %lld setting queue for prio %d\n", rc, prio);
rc = -EIO;
} else {
/*
* KVM code requires all of the above to be visible before
* q->qpage is set due to how it manages IPI EOIs
*/
wmb();
q->qpage = qpage;
}
fail:
return rc;
}
EXPORT_SYMBOL_GPL(xive_native_configure_queue);
static void __xive_native_disable_queue(u32 vp_id, struct xive_q *q, u8 prio)
{
s64 rc;
/* Disable the queue in HW */
for (;;) {
rc = opal_xive_set_queue_info(vp_id, prio, 0, 0, 0);
if (rc != OPAL_BUSY)
break;
msleep(1);
}
if (rc)
pr_err("Error %lld disabling queue for prio %d\n", rc, prio);
}
void xive_native_disable_queue(u32 vp_id, struct xive_q *q, u8 prio)
{
__xive_native_disable_queue(vp_id, q, prio);
}
EXPORT_SYMBOL_GPL(xive_native_disable_queue);
static int xive_native_setup_queue(unsigned int cpu, struct xive_cpu *xc, u8 prio)
{
struct xive_q *q = &xc->queue[prio];
__be32 *qpage;
qpage = xive_queue_page_alloc(cpu, xive_queue_shift);
if (IS_ERR(qpage))
return PTR_ERR(qpage);
return xive_native_configure_queue(get_hard_smp_processor_id(cpu),
q, prio, qpage, xive_queue_shift, false);
}
static void xive_native_cleanup_queue(unsigned int cpu, struct xive_cpu *xc, u8 prio)
{
struct xive_q *q = &xc->queue[prio];
unsigned int alloc_order;
/*
* We use the variant with no iounmap as this is called on exec
* from an IPI and iounmap isn't safe
*/
__xive_native_disable_queue(get_hard_smp_processor_id(cpu), q, prio);
alloc_order = xive_alloc_order(xive_queue_shift);
free_pages((unsigned long)q->qpage, alloc_order);
q->qpage = NULL;
}
static bool xive_native_match(struct device_node *node)
{
return of_device_is_compatible(node, "ibm,opal-xive-vc");
}
#ifdef CONFIG_SMP
static int xive_native_get_ipi(unsigned int cpu, struct xive_cpu *xc)
{
struct device_node *np;
unsigned int chip_id;
s64 irq;
/* Find the chip ID */
np = of_get_cpu_node(cpu, NULL);
if (np) {
if (of_property_read_u32(np, "ibm,chip-id", &chip_id) < 0)
chip_id = 0;
}
/* Allocate an IPI and populate info about it */
for (;;) {
irq = opal_xive_allocate_irq(chip_id);
if (irq == OPAL_BUSY) {
msleep(1);
continue;
}
if (irq < 0) {
pr_err("Failed to allocate IPI on CPU %d\n", cpu);
return -ENXIO;
}
xc->hw_ipi = irq;
break;
}
return 0;
}
#endif /* CONFIG_SMP */
u32 xive_native_alloc_irq(void)
{
s64 rc;
for (;;) {
rc = opal_xive_allocate_irq(OPAL_XIVE_ANY_CHIP);
if (rc != OPAL_BUSY)
break;
msleep(1);
}
if (rc < 0)
return 0;
return rc;
}
EXPORT_SYMBOL_GPL(xive_native_alloc_irq);
void xive_native_free_irq(u32 irq)
{
for (;;) {
s64 rc = opal_xive_free_irq(irq);
if (rc != OPAL_BUSY)
break;
msleep(1);
}
}
EXPORT_SYMBOL_GPL(xive_native_free_irq);
#ifdef CONFIG_SMP
static void xive_native_put_ipi(unsigned int cpu, struct xive_cpu *xc)
{
s64 rc;
/* Free the IPI */
if (!xc->hw_ipi)
return;
for (;;) {
rc = opal_xive_free_irq(xc->hw_ipi);
if (rc == OPAL_BUSY) {
msleep(1);
continue;
}
xc->hw_ipi = 0;
break;
}
}
#endif /* CONFIG_SMP */
static void xive_native_shutdown(void)
{
/* Switch the XIVE to emulation mode */
opal_xive_reset(OPAL_XIVE_MODE_EMU);
}
/*
* Perform an "ack" cycle on the current thread, thus
* grabbing the pending active priorities and updating
* the CPPR to the most favored one.
*/
static void xive_native_update_pending(struct xive_cpu *xc)
{
u8 he, cppr;
u16 ack;
/* Perform the acknowledge hypervisor to register cycle */
ack = be16_to_cpu(__raw_readw(xive_tima + TM_SPC_ACK_HV_REG));
/* Synchronize subsequent queue accesses */
mb();
/*
* Grab the CPPR and the "HE" field which indicates the source
* of the hypervisor interrupt (if any)
*/
cppr = ack & 0xff;
he = GETFIELD(TM_QW3_NSR_HE, (ack >> 8));
switch(he) {
case TM_QW3_NSR_HE_NONE: /* Nothing to see here */
break;
case TM_QW3_NSR_HE_PHYS: /* Physical thread interrupt */
if (cppr == 0xff)
return;
/* Mark the priority pending */
xc->pending_prio |= 1 << cppr;
/*
* A new interrupt should never have a CPPR less favored
* than our current one.
*/
if (cppr >= xc->cppr)
pr_err("CPU %d odd ack CPPR, got %d at %d\n",
smp_processor_id(), cppr, xc->cppr);
/* Update our idea of what the CPPR is */
xc->cppr = cppr;
break;
case TM_QW3_NSR_HE_POOL: /* HV Pool interrupt (unused) */
case TM_QW3_NSR_HE_LSI: /* Legacy FW LSI (unused) */
pr_err("CPU %d got unexpected interrupt type HE=%d\n",
smp_processor_id(), he);
return;
}
}
static void xive_native_eoi(u32 hw_irq)
{
/*
* Not normally used except if specific interrupts need
* a workaround on EOI.
*/
opal_int_eoi(hw_irq);
}
static void xive_native_setup_cpu(unsigned int cpu, struct xive_cpu *xc)
{
s64 rc;
u32 vp;
__be64 vp_cam_be;
u64 vp_cam;
if (xive_pool_vps == XIVE_INVALID_VP)
return;
/* Enable the pool VP */
vp = xive_pool_vps + cpu;
pr_debug("CPU %d setting up pool VP 0x%x\n", cpu, vp);
for (;;) {
rc = opal_xive_set_vp_info(vp, OPAL_XIVE_VP_ENABLED, 0);
if (rc != OPAL_BUSY)
break;
msleep(1);
}
if (rc) {
pr_err("Failed to enable pool VP on CPU %d\n", cpu);
return;
}
/* Grab it's CAM value */
rc = opal_xive_get_vp_info(vp, NULL, &vp_cam_be, NULL, NULL);
if (rc) {
pr_err("Failed to get pool VP info CPU %d\n", cpu);
return;
}
vp_cam = be64_to_cpu(vp_cam_be);
pr_debug("VP CAM = %llx\n", vp_cam);
/* Push it on the CPU (set LSMFB to 0xff to skip backlog scan) */
pr_debug("(Old HW value: %08x)\n",
in_be32(xive_tima + TM_QW2_HV_POOL + TM_WORD2));
out_be32(xive_tima + TM_QW2_HV_POOL + TM_WORD0, 0xff);
out_be32(xive_tima + TM_QW2_HV_POOL + TM_WORD2,
TM_QW2W2_VP | vp_cam);
pr_debug("(New HW value: %08x)\n",
in_be32(xive_tima + TM_QW2_HV_POOL + TM_WORD2));
}
static void xive_native_teardown_cpu(unsigned int cpu, struct xive_cpu *xc)
{
s64 rc;
u32 vp;
if (xive_pool_vps == XIVE_INVALID_VP)
return;
/* Pull the pool VP from the CPU */
in_be64(xive_tima + TM_SPC_PULL_POOL_CTX);
/* Disable it */
vp = xive_pool_vps + cpu;
for (;;) {
rc = opal_xive_set_vp_info(vp, 0, 0);
if (rc != OPAL_BUSY)
break;
msleep(1);
}
}
void xive_native_sync_source(u32 hw_irq)
{
opal_xive_sync(XIVE_SYNC_EAS, hw_irq);
}
EXPORT_SYMBOL_GPL(xive_native_sync_source);
static const struct xive_ops xive_native_ops = {
.populate_irq_data = xive_native_populate_irq_data,
.configure_irq = xive_native_configure_irq,
.setup_queue = xive_native_setup_queue,
.cleanup_queue = xive_native_cleanup_queue,
.match = xive_native_match,
.shutdown = xive_native_shutdown,
.update_pending = xive_native_update_pending,
.eoi = xive_native_eoi,
.setup_cpu = xive_native_setup_cpu,
.teardown_cpu = xive_native_teardown_cpu,
.sync_source = xive_native_sync_source,
#ifdef CONFIG_SMP
.get_ipi = xive_native_get_ipi,
.put_ipi = xive_native_put_ipi,
#endif /* CONFIG_SMP */
.name = "native",
};
static bool xive_parse_provisioning(struct device_node *np)
{
int rc;
if (of_property_read_u32(np, "ibm,xive-provision-page-size",
&xive_provision_size) < 0)
return true;
rc = of_property_count_elems_of_size(np, "ibm,xive-provision-chips", 4);
if (rc < 0) {
pr_err("Error %d getting provision chips array\n", rc);
return false;
}
xive_provision_chip_count = rc;
if (rc == 0)
return true;
xive_provision_chips = kzalloc(4 * xive_provision_chip_count,
GFP_KERNEL);
if (WARN_ON(!xive_provision_chips))
return false;
rc = of_property_read_u32_array(np, "ibm,xive-provision-chips",
xive_provision_chips,
xive_provision_chip_count);
if (rc < 0) {
pr_err("Error %d reading provision chips array\n", rc);
return false;
}
xive_provision_cache = kmem_cache_create("xive-provision",
xive_provision_size,
xive_provision_size,
0, NULL);
if (!xive_provision_cache) {
pr_err("Failed to allocate provision cache\n");
return false;
}
return true;
}
static void xive_native_setup_pools(void)
{
/* Allocate a pool big enough */
pr_debug("XIVE: Allocating VP block for pool size %u\n", nr_cpu_ids);
xive_pool_vps = xive_native_alloc_vp_block(nr_cpu_ids);
if (WARN_ON(xive_pool_vps == XIVE_INVALID_VP))
pr_err("XIVE: Failed to allocate pool VP, KVM might not function\n");
pr_debug("XIVE: Pool VPs allocated at 0x%x for %u max CPUs\n",
xive_pool_vps, nr_cpu_ids);
}
u32 xive_native_default_eq_shift(void)
{
return xive_queue_shift;
}
EXPORT_SYMBOL_GPL(xive_native_default_eq_shift);
bool __init xive_native_init(void)
{
struct device_node *np;
struct resource r;
void __iomem *tima;
struct property *prop;
u8 max_prio = 7;
const __be32 *p;
u32 val, cpu;
s64 rc;
if (xive_cmdline_disabled)
return false;
pr_devel("xive_native_init()\n");
np = of_find_compatible_node(NULL, NULL, "ibm,opal-xive-pe");
if (!np) {
pr_devel("not found !\n");
return false;
}
pr_devel("Found %pOF\n", np);
/* Resource 1 is HV window */
if (of_address_to_resource(np, 1, &r)) {
pr_err("Failed to get thread mgmnt area resource\n");
return false;
}
tima = ioremap(r.start, resource_size(&r));
if (!tima) {
pr_err("Failed to map thread mgmnt area\n");
return false;
}
/* Read number of priorities */
if (of_property_read_u32(np, "ibm,xive-#priorities", &val) == 0)
max_prio = val - 1;
/* Iterate the EQ sizes and pick one */
of_property_for_each_u32(np, "ibm,xive-eq-sizes", prop, p, val) {
xive_queue_shift = val;
if (val == PAGE_SHIFT)
break;
}
/* Configure Thread Management areas for KVM */
for_each_possible_cpu(cpu)
kvmppc_set_xive_tima(cpu, r.start, tima);
/* Grab size of provisionning pages */
xive_parse_provisioning(np);
/* Switch the XIVE to exploitation mode */
rc = opal_xive_reset(OPAL_XIVE_MODE_EXPL);
if (rc) {
pr_err("Switch to exploitation mode failed with error %lld\n", rc);
return false;
}
/* Setup some dummy HV pool VPs */
xive_native_setup_pools();
/* Initialize XIVE core with our backend */
if (!xive_core_init(&xive_native_ops, tima, TM_QW3_HV_PHYS,
max_prio)) {
opal_xive_reset(OPAL_XIVE_MODE_EMU);
return false;
}
pr_info("Using %dkB queues\n", 1 << (xive_queue_shift - 10));
return true;
}
static bool xive_native_provision_pages(void)
{
u32 i;
void *p;
for (i = 0; i < xive_provision_chip_count; i++) {
u32 chip = xive_provision_chips[i];
/*
* XXX TODO: Try to make the allocation local to the node where
* the chip resides.
*/
p = kmem_cache_alloc(xive_provision_cache, GFP_KERNEL);
if (!p) {
pr_err("Failed to allocate provisioning page\n");
return false;
}
opal_xive_donate_page(chip, __pa(p));
}
return true;
}
u32 xive_native_alloc_vp_block(u32 max_vcpus)
{
s64 rc;
u32 order;
order = fls(max_vcpus) - 1;
if (max_vcpus > (1 << order))
order++;
pr_debug("VP block alloc, for max VCPUs %d use order %d\n",
max_vcpus, order);
for (;;) {
rc = opal_xive_alloc_vp_block(order);
switch (rc) {
case OPAL_BUSY:
msleep(1);
break;
case OPAL_XIVE_PROVISIONING:
if (!xive_native_provision_pages())
return XIVE_INVALID_VP;
break;
default:
if (rc < 0) {
pr_err("OPAL failed to allocate VCPUs order %d, err %lld\n",
order, rc);
return XIVE_INVALID_VP;
}
return rc;
}
}
}
EXPORT_SYMBOL_GPL(xive_native_alloc_vp_block);
void xive_native_free_vp_block(u32 vp_base)
{
s64 rc;
if (vp_base == XIVE_INVALID_VP)
return;
rc = opal_xive_free_vp_block(vp_base);
if (rc < 0)
pr_warn("OPAL error %lld freeing VP block\n", rc);
}
EXPORT_SYMBOL_GPL(xive_native_free_vp_block);
int xive_native_enable_vp(u32 vp_id)
{
s64 rc;
for (;;) {
rc = opal_xive_set_vp_info(vp_id, OPAL_XIVE_VP_ENABLED, 0);
if (rc != OPAL_BUSY)
break;
msleep(1);
}
return rc ? -EIO : 0;
}
EXPORT_SYMBOL_GPL(xive_native_enable_vp);
int xive_native_disable_vp(u32 vp_id)
{
s64 rc;
for (;;) {
rc = opal_xive_set_vp_info(vp_id, 0, 0);
if (rc != OPAL_BUSY)
break;
msleep(1);
}
return rc ? -EIO : 0;
}
EXPORT_SYMBOL_GPL(xive_native_disable_vp);
int xive_native_get_vp_info(u32 vp_id, u32 *out_cam_id, u32 *out_chip_id)
{
__be64 vp_cam_be;
__be32 vp_chip_id_be;
s64 rc;
rc = opal_xive_get_vp_info(vp_id, NULL, &vp_cam_be, NULL, &vp_chip_id_be);
if (rc)
return -EIO;
*out_cam_id = be64_to_cpu(vp_cam_be) & 0xffffffffu;
*out_chip_id = be32_to_cpu(vp_chip_id_be);
return 0;
}
EXPORT_SYMBOL_GPL(xive_native_get_vp_info);