From: Kazunori Asayama Date: Fri, 20 Jul 2007 19:39:30 +0000 (+0200) Subject: [CELL] spufs: Avoid unexpectedly restaring MFC during context save X-Git-Tag: firefly_0821_release~27391^2~24 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=49776d30aea903fb2f9966c8e9b6f23ae5f7c937;p=firefly-linux-kernel-4.4.55.git [CELL] spufs: Avoid unexpectedly restaring MFC during context save The current SPU context saving procedure in SPUFS unexpectedly restarts MFC when halting decrementer, because MFC_CNTL[Dh] is set without MFC_CNTL[Sm]. This bug causes, for example, saving broken DMA queues. Here is a patch to fix the problem. Signed-off-by: Kazunori Asayama Signed-off-by: Jeremy Kerr Signed-off-by: Arnd Bergmann --- diff --git a/arch/powerpc/platforms/cell/spufs/switch.c b/arch/powerpc/platforms/cell/spufs/switch.c index 9c506ba08cdc..827aada391f2 100644 --- a/arch/powerpc/platforms/cell/spufs/switch.c +++ b/arch/powerpc/platforms/cell/spufs/switch.c @@ -271,7 +271,8 @@ static inline void halt_mfc_decr(struct spu_state *csa, struct spu *spu) * Write MFC_CNTL[Dh] set to a '1' to halt * the decrementer. */ - out_be64(&priv2->mfc_control_RW, MFC_CNTL_DECREMENTER_HALTED); + out_be64(&priv2->mfc_control_RW, + MFC_CNTL_DECREMENTER_HALTED | MFC_CNTL_SUSPEND_MASK); eieio(); } diff --git a/include/asm-powerpc/spu.h b/include/asm-powerpc/spu.h index 42d88a6d2dfd..a034f03b8107 100644 --- a/include/asm-powerpc/spu.h +++ b/include/asm-powerpc/spu.h @@ -411,6 +411,7 @@ struct spu_priv2 { #define MFC_CNTL_RESUME_DMA_QUEUE (0ull << 0) #define MFC_CNTL_SUSPEND_DMA_QUEUE (1ull << 0) #define MFC_CNTL_SUSPEND_DMA_QUEUE_MASK (1ull << 0) +#define MFC_CNTL_SUSPEND_MASK (1ull << 4) #define MFC_CNTL_NORMAL_DMA_QUEUE_OPERATION (0ull << 8) #define MFC_CNTL_SUSPEND_IN_PROGRESS (1ull << 8) #define MFC_CNTL_SUSPEND_COMPLETE (3ull << 8)