[PATCH] spufs: switchable spu contexts

Add some infrastructure for saving and restoring the context of an
SPE. This patch creates a new structure that can hold the whole
state of a physical SPE in memory. It also contains code that
avoids races during the context switch and the binary code that
is loaded to the SPU in order to access its registers.

The actual PPE- and SPE-side context switch code are two separate
patches.

Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/include/asm-powerpc/spu.h b/include/asm-powerpc/spu.h
index b036385cd831..62718f3ba03f 100644
--- a/include/asm-powerpc/spu.h
+++ b/include/asm-powerpc/spu.h
@@ -29,6 +29,81 @@
 #define LS_ORDER (6)		/* 256 kb */
 
 #define LS_SIZE (PAGE_SIZE << LS_ORDER)
+#define LS_ADDR_MASK (LS_SIZE - 1)
+
+#define MFC_PUT_CMD             0x20
+#define MFC_PUTS_CMD            0x28
+#define MFC_PUTR_CMD            0x30
+#define MFC_PUTF_CMD            0x22
+#define MFC_PUTB_CMD            0x21
+#define MFC_PUTFS_CMD           0x2A
+#define MFC_PUTBS_CMD           0x29
+#define MFC_PUTRF_CMD           0x32
+#define MFC_PUTRB_CMD           0x31
+#define MFC_PUTL_CMD            0x24
+#define MFC_PUTRL_CMD           0x34
+#define MFC_PUTLF_CMD           0x26
+#define MFC_PUTLB_CMD           0x25
+#define MFC_PUTRLF_CMD          0x36
+#define MFC_PUTRLB_CMD          0x35
+
+#define MFC_GET_CMD             0x40
+#define MFC_GETS_CMD            0x48
+#define MFC_GETF_CMD            0x42
+#define MFC_GETB_CMD            0x41
+#define MFC_GETFS_CMD           0x4A
+#define MFC_GETBS_CMD           0x49
+#define MFC_GETL_CMD            0x44
+#define MFC_GETLF_CMD           0x46
+#define MFC_GETLB_CMD           0x45
+
+#define MFC_SDCRT_CMD           0x80
+#define MFC_SDCRTST_CMD         0x81
+#define MFC_SDCRZ_CMD           0x89
+#define MFC_SDCRS_CMD           0x8D
+#define MFC_SDCRF_CMD           0x8F
+
+#define MFC_GETLLAR_CMD         0xD0
+#define MFC_PUTLLC_CMD          0xB4
+#define MFC_PUTLLUC_CMD         0xB0
+#define MFC_PUTQLLUC_CMD        0xB8
+#define MFC_SNDSIG_CMD          0xA0
+#define MFC_SNDSIGB_CMD         0xA1
+#define MFC_SNDSIGF_CMD         0xA2
+#define MFC_BARRIER_CMD         0xC0
+#define MFC_EIEIO_CMD           0xC8
+#define MFC_SYNC_CMD            0xCC
+
+#define MFC_MIN_DMA_SIZE_SHIFT  4       /* 16 bytes */
+#define MFC_MAX_DMA_SIZE_SHIFT  14      /* 16384 bytes */
+#define MFC_MIN_DMA_SIZE        (1 << MFC_MIN_DMA_SIZE_SHIFT)
+#define MFC_MAX_DMA_SIZE        (1 << MFC_MAX_DMA_SIZE_SHIFT)
+#define MFC_MIN_DMA_SIZE_MASK   (MFC_MIN_DMA_SIZE - 1)
+#define MFC_MAX_DMA_SIZE_MASK   (MFC_MAX_DMA_SIZE - 1)
+#define MFC_MIN_DMA_LIST_SIZE   0x0008  /*   8 bytes */
+#define MFC_MAX_DMA_LIST_SIZE   0x4000  /* 16K bytes */
+
+#define MFC_TAGID_TO_TAGMASK(tag_id)  (1 << (tag_id & 0x1F))
+
+/* Events for Channels 0-2 */
+#define MFC_DMA_TAG_STATUS_UPDATE_EVENT     0x00000001
+#define MFC_DMA_TAG_CMD_STALL_NOTIFY_EVENT  0x00000002
+#define MFC_DMA_QUEUE_AVAILABLE_EVENT       0x00000008
+#define MFC_SPU_MAILBOX_WRITTEN_EVENT       0x00000010
+#define MFC_DECREMENTER_EVENT               0x00000020
+#define MFC_PU_INT_MAILBOX_AVAILABLE_EVENT  0x00000040
+#define MFC_PU_MAILBOX_AVAILABLE_EVENT      0x00000080
+#define MFC_SIGNAL_2_EVENT                  0x00000100
+#define MFC_SIGNAL_1_EVENT                  0x00000200
+#define MFC_LLR_LOST_EVENT                  0x00000400
+#define MFC_PRIV_ATTN_EVENT                 0x00000800
+#define MFC_MULTI_SRC_EVENT                 0x00001000
+
+/* Flags indicating progress during context switch. */
+#define SPU_CONTEXT_SWITCH_PENDING_nr	0UL
+#define SPU_CONTEXT_SWITCH_ACTIVE_nr	1UL
+#define SPU_CONTEXT_SWITCH_PENDING	(1UL << SPU_CONTEXT_SWITCH_PENDING_nr)
+#define SPU_CONTEXT_SWITCH_ACTIVE	(1UL << SPU_CONTEXT_SWITCH_ACTIVE_nr)
 
 struct spu {
 	char *name;
@@ -41,6 +116,7 @@ struct spu {
 	int number;
 	u32 isrc;
 	u32 node;
+	u64 flags;
 	struct kref kref;
 	size_t ls_size;
 	unsigned int slb_replace;