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Diffstat (limited to 'arch/powerpc/platforms/pseries/xics.c')
-rw-r--r--arch/powerpc/platforms/pseries/xics.c550
1 files changed, 293 insertions, 257 deletions
diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c
index 0fc830f576f5..e1904774a70f 100644
--- a/arch/powerpc/platforms/pseries/xics.c
+++ b/arch/powerpc/platforms/pseries/xics.c
@@ -9,32 +9,30 @@
* 2 of the License, or (at your option) any later version.
*/
-
#include <linux/types.h>
#include <linux/threads.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
-#include <linux/signal.h>
#include <linux/init.h>
-#include <linux/gfp.h>
#include <linux/radix-tree.h>
#include <linux/cpu.h>
+#include <linux/of.h>
#include <asm/firmware.h>
-#include <asm/prom.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/smp.h>
#include <asm/rtas.h>
#include <asm/hvcall.h>
#include <asm/machdep.h>
-#include <asm/i8259.h>
#include "xics.h"
#include "plpar_wrappers.h"
+static struct irq_host *xics_host;
+
#define XICS_IPI 2
#define XICS_IRQ_SPURIOUS 0
@@ -47,6 +45,20 @@
*/
#define IPI_PRIORITY 4
+static unsigned int default_server = 0xFF;
+static unsigned int default_distrib_server = 0;
+static unsigned int interrupt_server_size = 8;
+
+/* RTAS service tokens */
+static int ibm_get_xive;
+static int ibm_set_xive;
+static int ibm_int_on;
+static int ibm_int_off;
+
+
+/* Direct hardware low level accessors */
+
+/* The part of the interrupt presentation layer that we care about */
struct xics_ipl {
union {
u32 word;
@@ -65,27 +77,6 @@ struct xics_ipl {
static struct xics_ipl __iomem *xics_per_cpu[NR_CPUS];
-static unsigned int default_server = 0xFF;
-static unsigned int default_distrib_server = 0;
-static unsigned int interrupt_server_size = 8;
-
-static struct irq_host *xics_host;
-
-/*
- * XICS only has a single IPI, so encode the messages per CPU
- */
-struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned;
-
-/* RTAS service tokens */
-static int ibm_get_xive;
-static int ibm_set_xive;
-static int ibm_int_on;
-static int ibm_int_off;
-
-
-/* Direct HW low level accessors */
-
-
static inline unsigned int direct_xirr_info_get(void)
{
int cpu = smp_processor_id();
@@ -93,7 +84,7 @@ static inline unsigned int direct_xirr_info_get(void)
return in_be32(&xics_per_cpu[cpu]->xirr.word);
}
-static inline void direct_xirr_info_set(int value)
+static inline void direct_xirr_info_set(unsigned int value)
{
int cpu = smp_processor_id();
@@ -115,7 +106,6 @@ static inline void direct_qirr_info(int n_cpu, u8 value)
/* LPAR low level accessors */
-
static inline unsigned int lpar_xirr_info_get(void)
{
unsigned long lpar_rc;
@@ -127,15 +117,14 @@ static inline unsigned int lpar_xirr_info_get(void)
return (unsigned int)return_value;
}
-static inline void lpar_xirr_info_set(int value)
+static inline void lpar_xirr_info_set(unsigned int value)
{
unsigned long lpar_rc;
- unsigned long val64 = value & 0xffffffff;
- lpar_rc = plpar_eoi(val64);
+ lpar_rc = plpar_eoi(value);
if (lpar_rc != H_SUCCESS)
- panic("bad return code EOI - rc = %ld, value=%lx\n", lpar_rc,
- val64);
+ panic("bad return code EOI - rc = %ld, value=%x\n", lpar_rc,
+ value);
}
static inline void lpar_cppr_info(u8 value)
@@ -157,48 +146,7 @@ static inline void lpar_qirr_info(int n_cpu , u8 value)
}
-/* High level handlers and init code */
-
-static void xics_update_irq_servers(void)
-{
- int i, j;
- struct device_node *np;
- u32 ilen;
- const u32 *ireg, *isize;
- u32 hcpuid;
-
- /* Find the server numbers for the boot cpu. */
- np = of_get_cpu_node(boot_cpuid, NULL);
- BUG_ON(!np);
-
- ireg = of_get_property(np, "ibm,ppc-interrupt-gserver#s", &ilen);
- if (!ireg) {
- of_node_put(np);
- return;
- }
-
- i = ilen / sizeof(int);
- hcpuid = get_hard_smp_processor_id(boot_cpuid);
-
- /* Global interrupt distribution server is specified in the last
- * entry of "ibm,ppc-interrupt-gserver#s" property. Get the last
- * entry fom this property for current boot cpu id and use it as
- * default distribution server
- */
- for (j = 0; j < i; j += 2) {
- if (ireg[j] == hcpuid) {
- default_server = hcpuid;
- default_distrib_server = ireg[j+1];
-
- isize = of_get_property(np,
- "ibm,interrupt-server#-size", NULL);
- if (isize)
- interrupt_server_size = *isize;
- }
- }
-
- of_node_put(np);
-}
+/* Interface to generic irq subsystem */
#ifdef CONFIG_SMP
static int get_irq_server(unsigned int virq, unsigned int strict_check)
@@ -208,9 +156,6 @@ static int get_irq_server(unsigned int virq, unsigned int strict_check)
cpumask_t cpumask = irq_desc[virq].affinity;
cpumask_t tmp = CPU_MASK_NONE;
- if (! cpu_isset(default_server, cpu_online_map))
- xics_update_irq_servers();
-
if (!distribute_irqs)
return default_server;
@@ -238,7 +183,6 @@ static int get_irq_server(unsigned int virq, unsigned int strict_check)
}
#endif
-
static void xics_unmask_irq(unsigned int virq)
{
unsigned int irq;
@@ -257,21 +201,28 @@ static void xics_unmask_irq(unsigned int virq)
call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server,
DEFAULT_PRIORITY);
if (call_status != 0) {
- printk(KERN_ERR "xics_enable_irq: irq=%u: ibm_set_xive "
- "returned %d\n", irq, call_status);
- printk("set_xive %x, server %x\n", ibm_set_xive, server);
+ printk(KERN_ERR
+ "%s: ibm_set_xive irq %u server %x returned %d\n",
+ __func__, irq, server, call_status);
return;
}
/* Now unmask the interrupt (often a no-op) */
call_status = rtas_call(ibm_int_on, 1, 1, NULL, irq);
if (call_status != 0) {
- printk(KERN_ERR "xics_enable_irq: irq=%u: ibm_int_on "
- "returned %d\n", irq, call_status);
+ printk(KERN_ERR "%s: ibm_int_on irq=%u returned %d\n",
+ __func__, irq, call_status);
return;
}
}
+static unsigned int xics_startup(unsigned int virq)
+{
+ /* unmask it */
+ xics_unmask_irq(virq);
+ return 0;
+}
+
static void xics_mask_real_irq(unsigned int irq)
{
int call_status;
@@ -281,8 +232,8 @@ static void xics_mask_real_irq(unsigned int irq)
call_status = rtas_call(ibm_int_off, 1, 1, NULL, irq);
if (call_status != 0) {
- printk(KERN_ERR "xics_disable_real_irq: irq=%u: "
- "ibm_int_off returned %d\n", irq, call_status);
+ printk(KERN_ERR "%s: ibm_int_off irq=%u returned %d\n",
+ __func__, irq, call_status);
return;
}
@@ -290,8 +241,8 @@ static void xics_mask_real_irq(unsigned int irq)
call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq,
default_server, 0xff);
if (call_status != 0) {
- printk(KERN_ERR "xics_disable_irq: irq=%u: ibm_set_xive(0xff)"
- " returned %d\n", irq, call_status);
+ printk(KERN_ERR "%s: ibm_set_xive(0xff) irq=%u returned %d\n",
+ __func__, irq, call_status);
return;
}
}
@@ -308,132 +259,77 @@ static void xics_mask_irq(unsigned int virq)
xics_mask_real_irq(irq);
}
-static unsigned int xics_startup(unsigned int virq)
-{
- unsigned int irq;
-
- /* force a reverse mapping of the interrupt so it gets in the cache */
- irq = (unsigned int)irq_map[virq].hwirq;
- irq_radix_revmap(xics_host, irq);
-
- /* unmask it */
- xics_unmask_irq(virq);
- return 0;
-}
-
-static void xics_eoi_direct(unsigned int virq)
+static void xics_mask_unknown_vec(unsigned int vec)
{
- unsigned int irq = (unsigned int)irq_map[virq].hwirq;
-
- iosync();
- direct_xirr_info_set((0xff << 24) | irq);
+ printk(KERN_ERR "Interrupt %u (real) is invalid, disabling it.\n", vec);
+ xics_mask_real_irq(vec);
}
-
-static void xics_eoi_lpar(unsigned int virq)
+static inline unsigned int xics_xirr_vector(unsigned int xirr)
{
- unsigned int irq = (unsigned int)irq_map[virq].hwirq;
-
- iosync();
- lpar_xirr_info_set((0xff << 24) | irq);
+ /*
+ * The top byte is the old cppr, to be restored on EOI.
+ * The remaining 24 bits are the vector.
+ */
+ return xirr & 0x00ffffff;
}
-static inline unsigned int xics_remap_irq(unsigned int vec)
+static unsigned int xics_get_irq_direct(void)
{
+ unsigned int xirr = direct_xirr_info_get();
+ unsigned int vec = xics_xirr_vector(xirr);
unsigned int irq;
- vec &= 0x00ffffff;
-
if (vec == XICS_IRQ_SPURIOUS)
return NO_IRQ;
- irq = irq_radix_revmap(xics_host, vec);
+
+ irq = irq_radix_revmap_lookup(xics_host, vec);
if (likely(irq != NO_IRQ))
return irq;
- printk(KERN_ERR "Interrupt %u (real) is invalid,"
- " disabling it.\n", vec);
- xics_mask_real_irq(vec);
- return NO_IRQ;
-}
+ /* We don't have a linux mapping, so have rtas mask it. */
+ xics_mask_unknown_vec(vec);
-static unsigned int xics_get_irq_direct(void)
-{
- return xics_remap_irq(direct_xirr_info_get());
+ /* We might learn about it later, so EOI it */
+ direct_xirr_info_set(xirr);
+ return NO_IRQ;
}
static unsigned int xics_get_irq_lpar(void)
{
- return xics_remap_irq(lpar_xirr_info_get());
-}
-
-#ifdef CONFIG_SMP
-
-static irqreturn_t xics_ipi_dispatch(int cpu)
-{
- WARN_ON(cpu_is_offline(cpu));
+ unsigned int xirr = lpar_xirr_info_get();
+ unsigned int vec = xics_xirr_vector(xirr);
+ unsigned int irq;
- while (xics_ipi_message[cpu].value) {
- if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION,
- &xics_ipi_message[cpu].value)) {
- mb();
- smp_message_recv(PPC_MSG_CALL_FUNCTION);
- }
- if (test_and_clear_bit(PPC_MSG_RESCHEDULE,
- &xics_ipi_message[cpu].value)) {
- mb();
- smp_message_recv(PPC_MSG_RESCHEDULE);
- }
- if (test_and_clear_bit(PPC_MSG_CALL_FUNC_SINGLE,
- &xics_ipi_message[cpu].value)) {
- mb();
- smp_message_recv(PPC_MSG_CALL_FUNC_SINGLE);
- }
-#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
- if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK,
- &xics_ipi_message[cpu].value)) {
- mb();
- smp_message_recv(PPC_MSG_DEBUGGER_BREAK);
- }
-#endif
- }
- return IRQ_HANDLED;
-}
+ if (vec == XICS_IRQ_SPURIOUS)
+ return NO_IRQ;
-static irqreturn_t xics_ipi_action_direct(int irq, void *dev_id)
-{
- int cpu = smp_processor_id();
+ irq = irq_radix_revmap_lookup(xics_host, vec);
+ if (likely(irq != NO_IRQ))
+ return irq;
- direct_qirr_info(cpu, 0xff);
+ /* We don't have a linux mapping, so have RTAS mask it. */
+ xics_mask_unknown_vec(vec);
- return xics_ipi_dispatch(cpu);
+ /* We might learn about it later, so EOI it */
+ lpar_xirr_info_set(xirr);
+ return NO_IRQ;
}
-static irqreturn_t xics_ipi_action_lpar(int irq, void *dev_id)
+static void xics_eoi_direct(unsigned int virq)
{
- int cpu = smp_processor_id();
-
- lpar_qirr_info(cpu, 0xff);
+ unsigned int irq = (unsigned int)irq_map[virq].hwirq;
- return xics_ipi_dispatch(cpu);
+ iosync();
+ direct_xirr_info_set((0xff << 24) | irq);
}
-void xics_cause_IPI(int cpu)
+static void xics_eoi_lpar(unsigned int virq)
{
- if (firmware_has_feature(FW_FEATURE_LPAR))
- lpar_qirr_info(cpu, IPI_PRIORITY);
- else
- direct_qirr_info(cpu, IPI_PRIORITY);
-}
-
-#endif /* CONFIG_SMP */
+ unsigned int irq = (unsigned int)irq_map[virq].hwirq;
-static void xics_set_cpu_priority(unsigned char cppr)
-{
- if (firmware_has_feature(FW_FEATURE_LPAR))
- lpar_cppr_info(cppr);
- else
- direct_cppr_info(cppr);
iosync();
+ lpar_xirr_info_set((0xff << 24) | irq);
}
static void xics_set_affinity(unsigned int virq, cpumask_t cpumask)
@@ -450,8 +346,8 @@ static void xics_set_affinity(unsigned int virq, cpumask_t cpumask)
status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq);
if (status) {
- printk(KERN_ERR "xics_set_affinity: irq=%u ibm,get-xive "
- "returns %d\n", irq, status);
+ printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n",
+ __func__, irq, status);
return;
}
@@ -463,8 +359,9 @@ static void xics_set_affinity(unsigned int virq, cpumask_t cpumask)
if (irq_server == -1) {
char cpulist[128];
cpumask_scnprintf(cpulist, sizeof(cpulist), cpumask);
- printk(KERN_WARNING "xics_set_affinity: No online cpus in "
- "the mask %s for irq %d\n", cpulist, virq);
+ printk(KERN_WARNING
+ "%s: No online cpus in the mask %s for irq %d\n",
+ __func__, cpulist, virq);
return;
}
@@ -472,28 +369,12 @@ static void xics_set_affinity(unsigned int virq, cpumask_t cpumask)
irq, irq_server, xics_status[1]);
if (status) {
- printk(KERN_ERR "xics_set_affinity: irq=%u ibm,set-xive "
- "returns %d\n", irq, status);
+ printk(KERN_ERR "%s: ibm,set-xive irq=%u returns %d\n",
+ __func__, irq, status);
return;
}
}
-void xics_setup_cpu(void)
-{
- xics_set_cpu_priority(0xff);
-
- /*
- * Put the calling processor into the GIQ. This is really only
- * necessary from a secondary thread as the OF start-cpu interface
- * performs this function for us on primary threads.
- *
- * XXX: undo of teardown on kexec needs this too, as may hotplug
- */
- rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE,
- (1UL << interrupt_server_size) - 1 - default_distrib_server, 1);
-}
-
-
static struct irq_chip xics_pic_direct = {
.typename = " XICS ",
.startup = xics_startup,
@@ -503,7 +384,6 @@ static struct irq_chip xics_pic_direct = {
.set_affinity = xics_set_affinity
};
-
static struct irq_chip xics_pic_lpar = {
.typename = " XICS ",
.startup = xics_startup,
@@ -513,6 +393,9 @@ static struct irq_chip xics_pic_lpar = {
.set_affinity = xics_set_affinity
};
+
+/* Interface to arch irq controller subsystem layer */
+
/* Points to the irq_chip we're actually using */
static struct irq_chip *xics_irq_chip;
@@ -530,6 +413,9 @@ static int xics_host_map(struct irq_host *h, unsigned int virq,
{
pr_debug("xics: map virq %d, hwirq 0x%lx\n", virq, hw);
+ /* Insert the interrupt mapping into the radix tree for fast lookup */
+ irq_radix_revmap_insert(xics_host, virq, hw);
+
get_irq_desc(virq)->status |= IRQ_LEVEL;
set_irq_chip_and_handler(virq, xics_irq_chip, handle_fasteoi_irq);
return 0;
@@ -569,10 +455,169 @@ static void __init xics_init_host(void)
irq_set_default_host(xics_host);
}
+
+/* Inter-processor interrupt support */
+
+#ifdef CONFIG_SMP
+/*
+ * XICS only has a single IPI, so encode the messages per CPU
+ */
+struct xics_ipi_struct {
+ unsigned long value;
+ } ____cacheline_aligned;
+
+static struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned;
+
+static inline void smp_xics_do_message(int cpu, int msg)
+{
+ set_bit(msg, &xics_ipi_message[cpu].value);
+ mb();
+ if (firmware_has_feature(FW_FEATURE_LPAR))
+ lpar_qirr_info(cpu, IPI_PRIORITY);
+ else
+ direct_qirr_info(cpu, IPI_PRIORITY);
+}
+
+void smp_xics_message_pass(int target, int msg)
+{
+ unsigned int i;
+
+ if (target < NR_CPUS) {
+ smp_xics_do_message(target, msg);
+ } else {
+ for_each_online_cpu(i) {
+ if (target == MSG_ALL_BUT_SELF
+ && i == smp_processor_id())
+ continue;
+ smp_xics_do_message(i, msg);
+ }
+ }
+}
+
+static irqreturn_t xics_ipi_dispatch(int cpu)
+{
+ WARN_ON(cpu_is_offline(cpu));
+
+ mb(); /* order mmio clearing qirr */
+ while (xics_ipi_message[cpu].value) {
+ if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION,
+ &xics_ipi_message[cpu].value)) {
+ smp_message_recv(PPC_MSG_CALL_FUNCTION);
+ }
+ if (test_and_clear_bit(PPC_MSG_RESCHEDULE,
+ &xics_ipi_message[cpu].value)) {
+ smp_message_recv(PPC_MSG_RESCHEDULE);
+ }
+ if (test_and_clear_bit(PPC_MSG_CALL_FUNC_SINGLE,
+ &xics_ipi_message[cpu].value)) {
+ smp_message_recv(PPC_MSG_CALL_FUNC_SINGLE);
+ }
+#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
+ if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK,
+ &xics_ipi_message[cpu].value)) {
+ smp_message_recv(PPC_MSG_DEBUGGER_BREAK);
+ }
+#endif
+ }
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t xics_ipi_action_direct(int irq, void *dev_id)
+{
+ int cpu = smp_processor_id();
+
+ direct_qirr_info(cpu, 0xff);
+
+ return xics_ipi_dispatch(cpu);
+}
+
+static irqreturn_t xics_ipi_action_lpar(int irq, void *dev_id)
+{
+ int cpu = smp_processor_id();
+
+ lpar_qirr_info(cpu, 0xff);
+
+ return xics_ipi_dispatch(cpu);
+}
+
+static void xics_request_ipi(void)
+{
+ unsigned int ipi;
+ int rc;
+
+ ipi = irq_create_mapping(xics_host, XICS_IPI);
+ BUG_ON(ipi == NO_IRQ);
+
+ /*
+ * IPIs are marked IRQF_DISABLED as they must run with irqs
+ * disabled
+ */
+ set_irq_handler(ipi, handle_percpu_irq);
+ if (firmware_has_feature(FW_FEATURE_LPAR))
+ rc = request_irq(ipi, xics_ipi_action_lpar,
+ IRQF_DISABLED|IRQF_PERCPU, "IPI", NULL);
+ else
+ rc = request_irq(ipi, xics_ipi_action_direct,
+ IRQF_DISABLED|IRQF_PERCPU, "IPI", NULL);
+ BUG_ON(rc);
+}
+
+int __init smp_xics_probe(void)
+{
+ xics_request_ipi();
+
+ return cpus_weight(cpu_possible_map);
+}
+
+#endif /* CONFIG_SMP */
+
+
+/* Initialization */
+
+static void xics_update_irq_servers(void)
+{
+ int i, j;
+ struct device_node *np;
+ u32 ilen;
+ const u32 *ireg, *isize;
+ u32 hcpuid;
+
+ /* Find the server numbers for the boot cpu. */
+ np = of_get_cpu_node(boot_cpuid, NULL);
+ BUG_ON(!np);
+
+ ireg = of_get_property(np, "ibm,ppc-interrupt-gserver#s", &ilen);
+ if (!ireg) {
+ of_node_put(np);
+ return;
+ }
+
+ i = ilen / sizeof(int);
+ hcpuid = get_hard_smp_processor_id(boot_cpuid);
+
+ /* Global interrupt distribution server is specified in the last
+ * entry of "ibm,ppc-interrupt-gserver#s" property. Get the last
+ * entry fom this property for current boot cpu id and use it as
+ * default distribution server
+ */
+ for (j = 0; j < i; j += 2) {
+ if (ireg[j] == hcpuid) {
+ default_server = hcpuid;
+ default_distrib_server = ireg[j+1];
+ }
+ }
+
+ /* get the bit size of server numbers */
+ isize = of_get_property(np, "ibm,interrupt-server#-size", NULL);
+ if (isize)
+ interrupt_server_size = *isize;
+
+ of_node_put(np);
+}
+
static void __init xics_map_one_cpu(int hw_id, unsigned long addr,
unsigned long size)
{
-#ifdef CONFIG_SMP
int i;
/* This may look gross but it's good enough for now, we don't quite
@@ -586,11 +631,6 @@ static void __init xics_map_one_cpu(int hw_id, unsigned long addr,
return;
}
}
-#else
- if (hw_id != 0)
- return;
- xics_per_cpu[0] = ioremap(addr, size);
-#endif /* CONFIG_SMP */
}
static void __init xics_init_one_node(struct device_node *np,
@@ -652,15 +692,17 @@ void __init xics_init_IRQ(void)
for_each_node_by_type(np, "PowerPC-External-Interrupt-Presentation") {
found = 1;
- if (firmware_has_feature(FW_FEATURE_LPAR))
+ if (firmware_has_feature(FW_FEATURE_LPAR)) {
+ of_node_put(np);
break;
+ }
xics_init_one_node(np, &indx);
}
if (found == 0)
return;
- xics_init_host();
xics_update_irq_servers();
+ xics_init_host();
if (firmware_has_feature(FW_FEATURE_LPAR))
ppc_md.get_irq = xics_get_irq_lpar;
@@ -672,30 +714,31 @@ void __init xics_init_IRQ(void)
ppc64_boot_msg(0x21, "XICS Done");
}
+/* Cpu startup, shutdown, and hotplug */
-#ifdef CONFIG_SMP
-void xics_request_IPIs(void)
+static void xics_set_cpu_priority(unsigned char cppr)
{
- unsigned int ipi;
- int rc;
-
- ipi = irq_create_mapping(xics_host, XICS_IPI);
- BUG_ON(ipi == NO_IRQ);
-
- /*
- * IPIs are marked IRQF_DISABLED as they must run with irqs
- * disabled
- */
- set_irq_handler(ipi, handle_percpu_irq);
if (firmware_has_feature(FW_FEATURE_LPAR))
- rc = request_irq(ipi, xics_ipi_action_lpar, IRQF_DISABLED,
- "IPI", NULL);
+ lpar_cppr_info(cppr);
else
- rc = request_irq(ipi, xics_ipi_action_direct, IRQF_DISABLED,
- "IPI", NULL);
- BUG_ON(rc);
+ direct_cppr_info(cppr);
+ iosync();
+}
+
+/* Have the calling processor join or leave the specified global queue */
+static void xics_set_cpu_giq(unsigned int gserver, unsigned int join)
+{
+ int status = rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE,
+ (1UL << interrupt_server_size) - 1 - gserver, join);
+ WARN_ON(status < 0);
+}
+
+void xics_setup_cpu(void)
+{
+ xics_set_cpu_priority(0xff);
+
+ xics_set_cpu_giq(default_distrib_server, 1);
}
-#endif /* CONFIG_SMP */
void xics_teardown_cpu(void)
{
@@ -703,9 +746,7 @@ void xics_teardown_cpu(void)
xics_set_cpu_priority(0);
- /*
- * Clear IPI
- */
+ /* Clear any pending IPI request */
if (firmware_has_feature(FW_FEATURE_LPAR))
lpar_qirr_info(cpu, 0xff);
else
@@ -714,34 +755,28 @@ void xics_teardown_cpu(void)
void xics_kexec_teardown_cpu(int secondary)
{
- unsigned int ipi;
- struct irq_desc *desc;
-
xics_teardown_cpu();
/*
- * we need to EOI the IPI
+ * we take the ipi irq but and never return so we
+ * need to EOI the IPI, but want to leave our priority 0
*
- * probably need to check all the other interrupts too
+ * should we check all the other interrupts too?
* should we be flagging idle loop instead?
* or creating some task to be scheduled?
*/
- ipi = irq_find_mapping(xics_host, XICS_IPI);
- if (ipi == XICS_IRQ_SPURIOUS)
- return;
- desc = get_irq_desc(ipi);
- if (desc->chip && desc->chip->eoi)
- desc->chip->eoi(ipi);
+ if (firmware_has_feature(FW_FEATURE_LPAR))
+ lpar_xirr_info_set((0x00 << 24) | XICS_IPI);
+ else
+ direct_xirr_info_set((0x00 << 24) | XICS_IPI);
/*
* Some machines need to have at least one cpu in the GIQ,
* so leave the master cpu in the group.
*/
if (secondary)
- rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE,
- (1UL << interrupt_server_size) - 1 -
- default_distrib_server, 0);
+ xics_set_cpu_giq(default_distrib_server, 0);
}
#ifdef CONFIG_HOTPLUG_CPU
@@ -749,17 +784,18 @@ void xics_kexec_teardown_cpu(int secondary)
/* Interrupts are disabled. */
void xics_migrate_irqs_away(void)
{
- int status;
int cpu = smp_processor_id(), hw_cpu = hard_smp_processor_id();
unsigned int irq, virq;
+ /* If we used to be the default server, move to the new "boot_cpuid" */
+ if (hw_cpu == default_server)
+ xics_update_irq_servers();
+
/* Reject any interrupt that was queued to us... */
xics_set_cpu_priority(0);
- /* remove ourselves from the global interrupt queue */
- status = rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE,
- (1UL << interrupt_server_size) - 1 - default_distrib_server, 0);
- WARN_ON(status < 0);
+ /* Remove ourselves from the global interrupt queue */
+ xics_set_cpu_giq(default_distrib_server, 0);
/* Allow IPIs again... */
xics_set_cpu_priority(DEFAULT_PRIORITY);
@@ -767,6 +803,7 @@ void xics_migrate_irqs_away(void)
for_each_irq(virq) {
struct irq_desc *desc;
int xics_status[2];
+ int status;
unsigned long flags;
/* We cant set affinity on ISA interrupts */
@@ -790,9 +827,8 @@ void xics_migrate_irqs_away(void)
status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq);
if (status) {
- printk(KERN_ERR "migrate_irqs_away: irq=%u "
- "ibm,get-xive returns %d\n",
- virq, status);
+ printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n",
+ __func__, irq, status);
goto unlock;
}