From: Masato Noguchi <[EMAIL PROTECTED]> Fix a bug that causes the PS3 to hang on the SPU Class 0 interrupt.
The Cell BE Architecture spec states that the SPU MFC Class 0 interrupt is delivered as a pulse. The current spu interrupt handler assumes this behavior and does not clear the interrupt status. The PS3 hypervisor visualizes all SPU interrupts as level, and on return from the interrupt handler the hypervisor will deliver a new virtual interrupt for any unmasked interrupts which for which the status has not been cleared. This fix clears the interrupt status in the interrupt handler. Signed-off-by: Masato Noguchi <[EMAIL PROTECTED]> Signed-off-by: Geoff Levand <[EMAIL PROTECTED]> --- Arnd, please consider for 2.6.24. Tested on QS20, and seems OK. arch/powerpc/platforms/cell/spu_base.c | 23 +++++++++++++++-------- include/asm-powerpc/spu.h | 2 +- 2 files changed, 16 insertions(+), 9 deletions(-) --- a/arch/powerpc/platforms/cell/spu_base.c +++ b/arch/powerpc/platforms/cell/spu_base.c @@ -236,27 +236,34 @@ static irqreturn_t spu_irq_class_0(int irq, void *data) { struct spu *spu; + unsigned long stat, mask; spu = data; - spu->class_0_pending = 1; + + mask = spu_int_mask_get(spu, 0); + stat = spu_int_stat_get(spu, 0); + stat &= mask; + + spin_lock(&spu->register_lock); + spu->class_0_pending |= stat; + spin_unlock(&spu->register_lock); + spu->stop_callback(spu); + spu_int_stat_clear(spu, 0, stat); + return IRQ_HANDLED; } int spu_irq_class_0_bottom(struct spu *spu) { - unsigned long stat, mask; unsigned long flags; - - spu->class_0_pending = 0; + unsigned long stat; spin_lock_irqsave(&spu->register_lock, flags); - mask = spu_int_mask_get(spu, 0); - stat = spu_int_stat_get(spu, 0); - - stat &= mask; + stat = spu->class_0_pending; + spu->class_0_pending = 0; if (stat & 1) /* invalid DMA alignment */ __spu_trap_dma_align(spu); --- a/include/asm-powerpc/spu.h +++ b/include/asm-powerpc/spu.h @@ -130,6 +130,7 @@ struct spu { u64 flags; u64 dar; u64 dsisr; + u64 class_0_pending; size_t ls_size; unsigned int slb_replace; struct mm_struct *mm; @@ -138,7 +139,6 @@ struct spu { unsigned long long timestamp; pid_t pid; pid_t tgid; - int class_0_pending; spinlock_t register_lock; void (* wbox_callback)(struct spu *spu); _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev