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-rw-r--r--arch/powerpc/platforms/pseries/xics.c443
1 files changed, 237 insertions, 206 deletions
diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c
index 2ffebe31cb2d..c7f04420066d 100644
--- a/arch/powerpc/platforms/pseries/xics.c
+++ b/arch/powerpc/platforms/pseries/xics.c
@@ -31,23 +31,6 @@
#include "xics.h"
-static unsigned int xics_startup(unsigned int irq);
-static void xics_enable_irq(unsigned int irq);
-static void xics_disable_irq(unsigned int irq);
-static void xics_mask_and_ack_irq(unsigned int irq);
-static void xics_end_irq(unsigned int irq);
-static void xics_set_affinity(unsigned int irq_nr, cpumask_t cpumask);
-
-static struct hw_interrupt_type xics_pic = {
- .typename = " XICS ",
- .startup = xics_startup,
- .enable = xics_enable_irq,
- .disable = xics_disable_irq,
- .ack = xics_mask_and_ack_irq,
- .end = xics_end_irq,
- .set_affinity = xics_set_affinity
-};
-
/* This is used to map real irq numbers to virtual */
static struct radix_tree_root irq_map = RADIX_TREE_INIT(GFP_ATOMIC);
@@ -98,47 +81,33 @@ static int ibm_set_xive;
static int ibm_int_on;
static int ibm_int_off;
-typedef struct {
- int (*xirr_info_get)(int cpu);
- void (*xirr_info_set)(int cpu, int val);
- void (*cppr_info)(int cpu, u8 val);
- void (*qirr_info)(int cpu, u8 val);
-} xics_ops;
+/* Direct HW low level accessors */
-/* SMP */
-static int pSeries_xirr_info_get(int n_cpu)
+static inline int direct_xirr_info_get(int n_cpu)
{
return in_be32(&xics_per_cpu[n_cpu]->xirr.word);
}
-static void pSeries_xirr_info_set(int n_cpu, int value)
+static inline void direct_xirr_info_set(int n_cpu, int value)
{
out_be32(&xics_per_cpu[n_cpu]->xirr.word, value);
}
-static void pSeries_cppr_info(int n_cpu, u8 value)
+static inline void direct_cppr_info(int n_cpu, u8 value)
{
out_8(&xics_per_cpu[n_cpu]->xirr.bytes[0], value);
}
-static void pSeries_qirr_info(int n_cpu, u8 value)
+static inline void direct_qirr_info(int n_cpu, u8 value)
{
out_8(&xics_per_cpu[n_cpu]->qirr.bytes[0], value);
}
-static xics_ops pSeries_ops = {
- pSeries_xirr_info_get,
- pSeries_xirr_info_set,
- pSeries_cppr_info,
- pSeries_qirr_info
-};
-
-static xics_ops *ops = &pSeries_ops;
+/* LPAR low level accessors */
-/* LPAR */
static inline long plpar_eoi(unsigned long xirr)
{
@@ -161,7 +130,7 @@ static inline long plpar_xirr(unsigned long *xirr_ret)
return plpar_hcall(H_XIRR, 0, 0, 0, 0, xirr_ret, &dummy, &dummy);
}
-static int pSeriesLP_xirr_info_get(int n_cpu)
+static inline int lpar_xirr_info_get(int n_cpu)
{
unsigned long lpar_rc;
unsigned long return_value;
@@ -172,7 +141,7 @@ static int pSeriesLP_xirr_info_get(int n_cpu)
return (int)return_value;
}
-static void pSeriesLP_xirr_info_set(int n_cpu, int value)
+static inline void lpar_xirr_info_set(int n_cpu, int value)
{
unsigned long lpar_rc;
unsigned long val64 = value & 0xffffffff;
@@ -183,7 +152,7 @@ static void pSeriesLP_xirr_info_set(int n_cpu, int value)
val64);
}
-void pSeriesLP_cppr_info(int n_cpu, u8 value)
+static inline void lpar_cppr_info(int n_cpu, u8 value)
{
unsigned long lpar_rc;
@@ -192,7 +161,7 @@ void pSeriesLP_cppr_info(int n_cpu, u8 value)
panic("bad return code cppr - rc = %lx\n", lpar_rc);
}
-static void pSeriesLP_qirr_info(int n_cpu , u8 value)
+static inline void lpar_qirr_info(int n_cpu , u8 value)
{
unsigned long lpar_rc;
@@ -201,36 +170,9 @@ static void pSeriesLP_qirr_info(int n_cpu , u8 value)
panic("bad return code qirr - rc = %lx\n", lpar_rc);
}
-xics_ops pSeriesLP_ops = {
- pSeriesLP_xirr_info_get,
- pSeriesLP_xirr_info_set,
- pSeriesLP_cppr_info,
- pSeriesLP_qirr_info
-};
-static unsigned int xics_startup(unsigned int virq)
-{
- unsigned int irq;
+/* High level handlers and init code */
- irq = irq_offset_down(virq);
- if (radix_tree_insert(&irq_map, virt_irq_to_real(irq),
- &virt_irq_to_real_map[irq]) == -ENOMEM)
- printk(KERN_CRIT "Out of memory creating real -> virtual"
- " IRQ mapping for irq %u (real 0x%x)\n",
- virq, virt_irq_to_real(irq));
- xics_enable_irq(virq);
- return 0; /* return value is ignored */
-}
-
-static unsigned int real_irq_to_virt(unsigned int real_irq)
-{
- unsigned int *ptr;
-
- ptr = radix_tree_lookup(&irq_map, real_irq);
- if (ptr == NULL)
- return NO_IRQ;
- return ptr - virt_irq_to_real_map;
-}
#ifdef CONFIG_SMP
static int get_irq_server(unsigned int irq)
@@ -264,17 +206,20 @@ static int get_irq_server(unsigned int irq)
}
#endif
-static void xics_enable_irq(unsigned int virq)
+
+static void xics_unmask_irq(unsigned int virq)
{
unsigned int irq;
int call_status;
unsigned int server;
irq = virt_irq_to_real(irq_offset_down(virq));
- if (irq == XICS_IPI)
+ WARN_ON(irq == NO_IRQ);
+ if (irq == XICS_IPI || irq == NO_IRQ)
return;
server = get_irq_server(virq);
+
call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server,
DEFAULT_PRIORITY);
if (call_status != 0) {
@@ -293,7 +238,7 @@ static void xics_enable_irq(unsigned int virq)
}
}
-static void xics_disable_real_irq(unsigned int irq)
+static void xics_mask_real_irq(unsigned int irq)
{
int call_status;
unsigned int server;
@@ -318,75 +263,104 @@ static void xics_disable_real_irq(unsigned int irq)
}
}
-static void xics_disable_irq(unsigned int virq)
+static void xics_mask_irq(unsigned int virq)
{
unsigned int irq;
irq = virt_irq_to_real(irq_offset_down(virq));
- xics_disable_real_irq(irq);
+ WARN_ON(irq == NO_IRQ);
+ if (irq != NO_IRQ)
+ xics_mask_real_irq(irq);
+}
+
+static void xics_set_irq_revmap(unsigned int virq)
+{
+ unsigned int irq;
+
+ irq = irq_offset_down(virq);
+ if (radix_tree_insert(&irq_map, virt_irq_to_real(irq),
+ &virt_irq_to_real_map[irq]) == -ENOMEM)
+ printk(KERN_CRIT "Out of memory creating real -> virtual"
+ " IRQ mapping for irq %u (real 0x%x)\n",
+ virq, virt_irq_to_real(irq));
}
-static void xics_end_irq(unsigned int irq)
+static unsigned int xics_startup(unsigned int virq)
+{
+ xics_set_irq_revmap(virq);
+ xics_unmask_irq(virq);
+ return 0;
+}
+
+static unsigned int real_irq_to_virt(unsigned int real_irq)
+{
+ unsigned int *ptr;
+
+ ptr = radix_tree_lookup(&irq_map, real_irq);
+ if (ptr == NULL)
+ return NO_IRQ;
+ return ptr - virt_irq_to_real_map;
+}
+
+static void xics_eoi_direct(unsigned int irq)
{
int cpu = smp_processor_id();
iosync();
- ops->xirr_info_set(cpu, ((0xff << 24) |
- (virt_irq_to_real(irq_offset_down(irq)))));
-
+ direct_xirr_info_set(cpu, ((0xff << 24) |
+ (virt_irq_to_real(irq_offset_down(irq)))));
}
-static void xics_mask_and_ack_irq(unsigned int irq)
+
+static void xics_eoi_lpar(unsigned int irq)
{
int cpu = smp_processor_id();
- if (irq < irq_offset_value()) {
- i8259_pic.ack(irq);
- iosync();
- ops->xirr_info_set(cpu, ((0xff<<24) |
- xics_irq_8259_cascade_real));
- iosync();
- }
+ iosync();
+ lpar_xirr_info_set(cpu, ((0xff << 24) |
+ (virt_irq_to_real(irq_offset_down(irq)))));
+
}
-int xics_get_irq(struct pt_regs *regs)
+static inline int xics_remap_irq(int vec)
{
- unsigned int cpu = smp_processor_id();
- unsigned int vec;
int irq;
- vec = ops->xirr_info_get(cpu);
- /* (vec >> 24) == old priority */
vec &= 0x00ffffff;
- /* for sanity, this had better be < NR_IRQS - 16 */
- if (vec == xics_irq_8259_cascade_real) {
- irq = i8259_irq(regs);
- xics_end_irq(irq_offset_up(xics_irq_8259_cascade));
- } else if (vec == XICS_IRQ_SPURIOUS) {
- irq = -1;
- } else {
- irq = real_irq_to_virt(vec);
- if (irq == NO_IRQ)
- irq = real_irq_to_virt_slowpath(vec);
- if (irq == NO_IRQ) {
- printk(KERN_ERR "Interrupt %u (real) is invalid,"
- " disabling it.\n", vec);
- xics_disable_real_irq(vec);
- } else
- irq = irq_offset_up(irq);
- }
- return irq;
+ if (vec == XICS_IRQ_SPURIOUS)
+ return NO_IRQ;
+
+ irq = real_irq_to_virt(vec);
+ if (irq == NO_IRQ)
+ irq = real_irq_to_virt_slowpath(vec);
+ if (likely(irq != NO_IRQ))
+ return irq_offset_up(irq);
+
+ printk(KERN_ERR "Interrupt %u (real) is invalid,"
+ " disabling it.\n", vec);
+ xics_mask_real_irq(vec);
+ return NO_IRQ;
}
-#ifdef CONFIG_SMP
+static int xics_get_irq_direct(struct pt_regs *regs)
+{
+ unsigned int cpu = smp_processor_id();
-static irqreturn_t xics_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
+ return xics_remap_irq(direct_xirr_info_get(cpu));
+}
+
+static int xics_get_irq_lpar(struct pt_regs *regs)
{
- int cpu = smp_processor_id();
+ unsigned int cpu = smp_processor_id();
- ops->qirr_info(cpu, 0xff);
+ return xics_remap_irq(lpar_xirr_info_get(cpu));
+}
+
+#ifdef CONFIG_SMP
+static irqreturn_t xics_ipi_dispatch(int cpu, struct pt_regs *regs)
+{
WARN_ON(cpu_is_offline(cpu));
while (xics_ipi_message[cpu].value) {
@@ -418,18 +392,108 @@ static irqreturn_t xics_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
return IRQ_HANDLED;
}
+static irqreturn_t xics_ipi_action_direct(int irq, void *dev_id, struct pt_regs *regs)
+{
+ int cpu = smp_processor_id();
+
+ direct_qirr_info(cpu, 0xff);
+
+ return xics_ipi_dispatch(cpu, regs);
+}
+
+static irqreturn_t xics_ipi_action_lpar(int irq, void *dev_id, struct pt_regs *regs)
+{
+ int cpu = smp_processor_id();
+
+ lpar_qirr_info(cpu, 0xff);
+
+ return xics_ipi_dispatch(cpu, regs);
+}
+
void xics_cause_IPI(int cpu)
{
- ops->qirr_info(cpu, IPI_PRIORITY);
+ if (firmware_has_feature(FW_FEATURE_LPAR))
+ lpar_qirr_info(cpu, IPI_PRIORITY);
+ else
+ direct_qirr_info(cpu, IPI_PRIORITY);
}
+
#endif /* CONFIG_SMP */
+static void xics_set_cpu_priority(int cpu, unsigned char cppr)
+{
+ if (firmware_has_feature(FW_FEATURE_LPAR))
+ lpar_cppr_info(cpu, cppr);
+ else
+ direct_cppr_info(cpu, cppr);
+ iosync();
+}
+
+static void xics_set_affinity(unsigned int virq, cpumask_t cpumask)
+{
+ unsigned int irq;
+ int status;
+ int xics_status[2];
+ unsigned long newmask;
+ cpumask_t tmp = CPU_MASK_NONE;
+
+ irq = virt_irq_to_real(irq_offset_down(virq));
+ if (irq == XICS_IPI || irq == NO_IRQ)
+ return;
+
+ 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);
+ return;
+ }
+
+ /* For the moment only implement delivery to all cpus or one cpu */
+ if (cpus_equal(cpumask, CPU_MASK_ALL)) {
+ newmask = default_distrib_server;
+ } else {
+ cpus_and(tmp, cpu_online_map, cpumask);
+ if (cpus_empty(tmp))
+ return;
+ newmask = get_hard_smp_processor_id(first_cpu(tmp));
+ }
+
+ status = rtas_call(ibm_set_xive, 3, 1, NULL,
+ irq, newmask, xics_status[1]);
+
+ if (status) {
+ printk(KERN_ERR "xics_set_affinity: irq=%u ibm,set-xive "
+ "returns %d\n", irq, status);
+ return;
+ }
+}
+
+static struct irq_chip xics_pic_direct = {
+ .typename = " XICS ",
+ .startup = xics_startup,
+ .mask = xics_mask_irq,
+ .unmask = xics_unmask_irq,
+ .eoi = xics_eoi_direct,
+ .set_affinity = xics_set_affinity
+};
+
+
+static struct irq_chip xics_pic_lpar = {
+ .typename = " XICS ",
+ .startup = xics_startup,
+ .mask = xics_mask_irq,
+ .unmask = xics_unmask_irq,
+ .eoi = xics_eoi_lpar,
+ .set_affinity = xics_set_affinity
+};
+
+
void xics_setup_cpu(void)
{
int cpu = smp_processor_id();
- ops->cppr_info(cpu, 0xff);
- iosync();
+ xics_set_cpu_priority(cpu, 0xff);
/*
* Put the calling processor into the GIQ. This is really only
@@ -453,6 +517,7 @@ void xics_init_IRQ(void)
unsigned long addr;
unsigned long size;
} intnodes[NR_CPUS];
+ struct irq_chip *chip;
ppc64_boot_msg(0x20, "XICS Init");
@@ -519,26 +584,10 @@ nextnode:
intr_base = intnodes[0].addr;
intr_size = intnodes[0].size;
- np = of_find_node_by_type(NULL, "interrupt-controller");
- if (!np) {
- printk(KERN_DEBUG "xics: no ISA interrupt controller\n");
- xics_irq_8259_cascade_real = -1;
- xics_irq_8259_cascade = -1;
- } else {
- ireg = (uint *) get_property(np, "interrupts", NULL);
- if (!ireg)
- panic("xics_init_IRQ: can't find ISA interrupts property");
-
- xics_irq_8259_cascade_real = *ireg;
- xics_irq_8259_cascade
- = virt_irq_create_mapping(xics_irq_8259_cascade_real);
- i8259_init(0, 0);
- of_node_put(np);
- }
-
- if (firmware_has_feature(FW_FEATURE_LPAR))
- ops = &pSeriesLP_ops;
- else {
+ if (firmware_has_feature(FW_FEATURE_LPAR)) {
+ ppc_md.get_irq = xics_get_irq_lpar;
+ chip = &xics_pic_lpar;
+ } else {
#ifdef CONFIG_SMP
for_each_possible_cpu(i) {
int hard_id;
@@ -554,32 +603,54 @@ nextnode:
#else
xics_per_cpu[0] = ioremap(intr_base, intr_size);
#endif /* CONFIG_SMP */
+ ppc_md.get_irq = xics_get_irq_direct;
+ chip = &xics_pic_direct;
+
}
- for (i = irq_offset_value(); i < NR_IRQS; ++i)
- get_irq_desc(i)->chip = &xics_pic;
+ for (i = irq_offset_value(); i < NR_IRQS; ++i) {
+ /* All IRQs on XICS are level for now. MSI code may want to modify
+ * that for reporting purposes
+ */
+ get_irq_desc(i)->status |= IRQ_LEVEL;
+ set_irq_chip_and_handler(i, chip, handle_fasteoi_irq);
+ }
xics_setup_cpu();
ppc64_boot_msg(0x21, "XICS Done");
}
-/*
- * We cant do this in init_IRQ because we need the memory subsystem up for
- * request_irq()
- */
-static int __init xics_setup_i8259(void)
-{
- if (ppc64_interrupt_controller == IC_PPC_XIC &&
- xics_irq_8259_cascade != -1) {
- if (request_irq(irq_offset_up(xics_irq_8259_cascade),
- no_action, 0, "8259 cascade", NULL))
- printk(KERN_ERR "xics_setup_i8259: couldn't get 8259 "
- "cascade\n");
+static int xics_setup_8259_cascade(void)
+{
+ struct device_node *np;
+ uint *ireg;
+
+ np = of_find_node_by_type(NULL, "interrupt-controller");
+ if (np == NULL) {
+ printk(KERN_WARNING "xics: no ISA interrupt controller\n");
+ xics_irq_8259_cascade_real = -1;
+ xics_irq_8259_cascade = -1;
+ return 0;
}
+
+ ireg = (uint *) get_property(np, "interrupts", NULL);
+ if (!ireg)
+ panic("xics_init_IRQ: can't find ISA interrupts property");
+
+ xics_irq_8259_cascade_real = *ireg;
+ xics_irq_8259_cascade = irq_offset_up
+ (virt_irq_create_mapping(xics_irq_8259_cascade_real));
+ i8259_init(0, 0);
+ of_node_put(np);
+
+ xics_set_irq_revmap(xics_irq_8259_cascade);
+ set_irq_chained_handler(xics_irq_8259_cascade, pSeries_8259_cascade);
+
return 0;
}
-arch_initcall(xics_setup_i8259);
+arch_initcall(xics_setup_8259_cascade);
+
#ifdef CONFIG_SMP
void xics_request_IPIs(void)
@@ -590,61 +661,22 @@ void xics_request_IPIs(void)
* IPIs are marked IRQF_DISABLED as they must run with irqs
* disabled
*/
- request_irq(irq_offset_up(XICS_IPI), xics_ipi_action,
- IRQF_DISABLED, "IPI", NULL);
- get_irq_desc(irq_offset_up(XICS_IPI))->status |= IRQ_PER_CPU;
-}
-#endif
-
-static void xics_set_affinity(unsigned int virq, cpumask_t cpumask)
-{
- unsigned int irq;
- int status;
- int xics_status[2];
- unsigned long newmask;
- cpumask_t tmp = CPU_MASK_NONE;
-
- irq = virt_irq_to_real(irq_offset_down(virq));
- if (irq == XICS_IPI || irq == NO_IRQ)
- return;
-
- 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);
- return;
- }
-
- /* For the moment only implement delivery to all cpus or one cpu */
- if (cpus_equal(cpumask, CPU_MASK_ALL)) {
- newmask = default_distrib_server;
- } else {
- cpus_and(tmp, cpu_online_map, cpumask);
- if (cpus_empty(tmp))
- return;
- newmask = get_hard_smp_processor_id(first_cpu(tmp));
- }
-
- status = rtas_call(ibm_set_xive, 3, 1, NULL,
- irq, newmask, xics_status[1]);
-
- if (status) {
- printk(KERN_ERR "xics_set_affinity: irq=%u ibm,set-xive "
- "returns %d\n", irq, status);
- return;
- }
+ set_irq_handler(irq_offset_up(XICS_IPI), handle_percpu_irq);
+ if (firmware_has_feature(FW_FEATURE_LPAR))
+ request_irq(irq_offset_up(XICS_IPI), xics_ipi_action_lpar,
+ SA_INTERRUPT, "IPI", NULL);
+ else
+ request_irq(irq_offset_up(XICS_IPI), xics_ipi_action_direct,
+ SA_INTERRUPT, "IPI", NULL);
}
+#endif /* CONFIG_SMP */
void xics_teardown_cpu(int secondary)
{
+ struct irq_desc *desc = get_irq_desc(irq_offset_up(XICS_IPI));
int cpu = smp_processor_id();
- ops->cppr_info(cpu, 0x00);
- iosync();
-
- /* Clear IPI */
- ops->qirr_info(cpu, 0xff);
+ xics_set_cpu_priority(cpu, 0);
/*
* we need to EOI the IPI if we got here from kexec down IPI
@@ -653,7 +685,8 @@ void xics_teardown_cpu(int secondary)
* should we be flagging idle loop instead?
* or creating some task to be scheduled?
*/
- ops->xirr_info_set(cpu, XICS_IPI);
+ if (desc->chip && desc->chip->eoi)
+ desc->chip->eoi(XICS_IPI);
/*
* Some machines need to have at least one cpu in the GIQ,
@@ -674,8 +707,7 @@ void xics_migrate_irqs_away(void)
unsigned int irq, virq, cpu = smp_processor_id();
/* Reject any interrupt that was queued to us... */
- ops->cppr_info(cpu, 0);
- iosync();
+ xics_set_cpu_priority(cpu, 0);
/* remove ourselves from the global interrupt queue */
status = rtas_set_indicator(GLOBAL_INTERRUPT_QUEUE,
@@ -683,11 +715,10 @@ void xics_migrate_irqs_away(void)
WARN_ON(status < 0);
/* Allow IPIs again... */
- ops->cppr_info(cpu, DEFAULT_PRIORITY);
- iosync();
+ xics_set_cpu_priority(cpu, DEFAULT_PRIORITY);
for_each_irq(virq) {
- irq_desc_t *desc;
+ struct irq_desc *desc;
int xics_status[2];
unsigned long flags;

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