#include <linux/radix-tree.h>
#include <linux/mutex.h>
#include <linux/bootmem.h>
+#include <linux/pci.h>
#include <linux/vs_context.h>
#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/machdep.h>
#include <asm/udbg.h>
-#ifdef CONFIG_PPC_ISERIES
+#ifdef CONFIG_PPC64
#include <asm/paca.h>
+#include <asm/firmware.h>
#endif
int __irq_offset_value;
EXPORT_SYMBOL(irq_desc);
int distribute_irqs = 1;
+
+static inline unsigned long get_hard_enabled(void)
+{
+ unsigned long enabled;
+
+ __asm__ __volatile__("lbz %0,%1(13)"
+ : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
+
+ return enabled;
+}
+
+static inline void set_soft_enabled(unsigned long enable)
+{
+ __asm__ __volatile__("stb %0,%1(13)"
+ : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
+}
+
+void local_irq_restore(unsigned long en)
+{
+ /*
+ * get_paca()->soft_enabled = en;
+ * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
+ * That was allowed before, and in such a case we do need to take care
+ * that gcc will set soft_enabled directly via r13, not choose to use
+ * an intermediate register, lest we're preempted to a different cpu.
+ */
+ set_soft_enabled(en);
+ if (!en)
+ return;
+
+ if (firmware_has_feature(FW_FEATURE_ISERIES)) {
+ /*
+ * Do we need to disable preemption here? Not really: in the
+ * unlikely event that we're preempted to a different cpu in
+ * between getting r13, loading its lppaca_ptr, and loading
+ * its any_int, we might call iseries_handle_interrupts without
+ * an interrupt pending on the new cpu, but that's no disaster,
+ * is it? And the business of preempting us off the old cpu
+ * would itself involve a local_irq_restore which handles the
+ * interrupt to that cpu.
+ *
+ * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
+ * to avoid any preemption checking added into get_paca().
+ */
+ if (local_paca->lppaca_ptr->int_dword.any_int)
+ iseries_handle_interrupts();
+ return;
+ }
+
+ /*
+ * if (get_paca()->hard_enabled) return;
+ * But again we need to take care that gcc gets hard_enabled directly
+ * via r13, not choose to use an intermediate register, lest we're
+ * preempted to a different cpu in between the two instructions.
+ */
+ if (get_hard_enabled())
+ return;
+
+ /*
+ * Need to hard-enable interrupts here. Since currently disabled,
+ * no need to take further asm precautions against preemption; but
+ * use local_paca instead of get_paca() to avoid preemption checking.
+ */
+ local_paca->hard_enabled = en;
+ if ((int)mfspr(SPRN_DEC) < 0)
+ mtspr(SPRN_DEC, 1);
+ hard_irq_enable();
+}
#endif /* CONFIG_PPC64 */
int show_interrupts(struct seq_file *p, void *v)
void do_IRQ(struct pt_regs *regs)
{
+ struct pt_regs *old_regs = set_irq_regs(regs);
unsigned int irq;
#ifdef CONFIG_IRQSTACKS
struct thread_info *curtp, *irqtp;
* The value -2 is for buggy hardware and means that this IRQ
* has already been handled. -- Tom
*/
- irq = ppc_md.get_irq(regs);
+ irq = ppc_md.get_irq();
if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
- struct vx_info_save vxis;
-
- __enter_vx_admin(&vxis);
#ifdef CONFIG_IRQSTACKS
/* Switch to the irq stack to handle this */
curtp = current_thread_info();
handler = &__do_IRQ;
irqtp->task = curtp->task;
irqtp->flags = 0;
- call_handle_irq(irq, desc, regs, irqtp, handler);
+ call_handle_irq(irq, desc, irqtp, handler);
irqtp->task = NULL;
if (irqtp->flags)
set_bits(irqtp->flags, &curtp->flags);
} else
#endif
- generic_handle_irq(irq, regs);
- __leave_vx_admin(&vxis);
+ generic_handle_irq(irq);
} else if (irq != NO_IRQ_IGNORE)
/* That's not SMP safe ... but who cares ? */
ppc_spurious_interrupts++;
irq_exit();
+ set_irq_regs(old_regs);
#ifdef CONFIG_PPC_ISERIES
- if (get_lppaca()->int_dword.fields.decr_int) {
-
+ if (firmware_has_feature(FW_FEATURE_ISERIES) &&
+ get_lppaca()->int_dword.fields.decr_int) {
get_lppaca()->int_dword.fields.decr_int = 0;
/* Signal a fake decrementer interrupt */
timer_interrupt(regs);
}
EXPORT_SYMBOL_GPL(irq_create_mapping);
-extern unsigned int irq_create_of_mapping(struct device_node *controller,
- u32 *intspec, unsigned int intsize)
+unsigned int irq_create_of_mapping(struct device_node *controller,
+ u32 *intspec, unsigned int intsize)
{
struct irq_host *host;
irq_hw_number_t hwirq;
void irq_dispose_mapping(unsigned int virq)
{
- struct irq_host *host = irq_map[virq].host;
+ struct irq_host *host;
irq_hw_number_t hwirq;
unsigned long flags;
+ if (virq == NO_IRQ)
+ return;
+
+ host = irq_map[virq].host;
WARN_ON (host == NULL);
if (host == NULL)
return;
{
unsigned long flags;
unsigned int i, j, found = NO_IRQ;
- unsigned int limit = irq_virq_count - count;
if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
return NO_IRQ;
/* Look for count consecutive numbers in the allocatable
* (non-legacy) space
*/
- for (i = NUM_ISA_INTERRUPTS; i <= limit; ) {
- for (j = i; j < (i + count); j++)
- if (irq_map[j].host != NULL) {
- i = j + 1;
- continue;
- }
- found = i;
- break;
+ for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
+ if (irq_map[i].host != NULL)
+ j = 0;
+ else
+ j++;
+
+ if (j == count) {
+ found = i - count + 1;
+ break;
+ }
}
if (found == NO_IRQ) {
spin_unlock_irqrestore(&irq_big_lock, flags);
else
return -1;
}
+EXPORT_SYMBOL(pci_enable_msi);
void pci_disable_msi(struct pci_dev * pdev)
{
if (ppc_md.disable_msi)
ppc_md.disable_msi(pdev);
}
+EXPORT_SYMBOL(pci_disable_msi);
void pci_scan_msi_device(struct pci_dev *dev) {}
int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) {return -1;}
void msi_remove_pci_irq_vectors(struct pci_dev *dev) {}
void disable_msi_mode(struct pci_dev *dev, int pos, int type) {}
void pci_no_msi(void) {}
+EXPORT_SYMBOL(pci_enable_msix);
+EXPORT_SYMBOL(pci_disable_msix);
#endif
git://git.onelab.eu / linux-2.6.git / blobdiff