[PATCH] spufs: cooperative scheduler support

This adds a scheduler for SPUs to make it possible to use
more logical SPUs than physical ones are present in the
system.

Currently, there is no support for preempting a running
SPU thread, they have to leave the SPU by either triggering
an event on the SPU that causes it to return to the
owning thread or by sending a signal to it.

This patch also adds operations that enable accessing an SPU
in either runnable or saved state. We use an RW semaphore
to protect the state of the SPU from changing underneath
us, while we are holding it readable. In order to change
the state, it is acquired writeable and a context save
or restore is executed before downgrading the semaphore
to read-only.

From: Mark Nutter <mnutter@us.ibm.com>,
      Uli Weigand <Ulrich.Weigand@de.ibm.com>
Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 429 insertions, 170 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index c1e6433..786fdb1 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -32,11 +32,13 @@
 
 #include "spufs.h"
 
+
 static int
 spufs_mem_open(struct inode *inode, struct file *file)
 {
 	struct spufs_inode_info *i = SPUFS_I(inode);
 	file->private_data = i->i_ctx;
+	file->f_mapping = i->i_ctx->local_store;
 	return 0;
 }
 
@@ -44,23 +46,16 @@ static ssize_t
 spufs_mem_read(struct file *file, char __user *buffer,
 				size_t size, loff_t *pos)
 {
-	struct spu *spu;
-	struct spu_context *ctx;
+	struct spu_context *ctx = file->private_data;
+	char *local_store;
 	int ret;
 
-	ctx = file->private_data;
-	spu = ctx->spu;
+	spu_acquire(ctx);
 
-	down_read(&ctx->backing_sema);
-	if (spu->number & 0/*1*/) {
-		ret = generic_file_read(file, buffer, size, pos);
-		goto out;
-	}
+	local_store = ctx->ops->get_ls(ctx);
+	ret = simple_read_from_buffer(buffer, size, pos, local_store, LS_SIZE);
 
-	ret = simple_read_from_buffer(buffer, size, pos,
-					spu->local_store, LS_SIZE);
-out:
-	up_read(&ctx->backing_sema);
+	spu_release(ctx);
 	return ret;
 }
 
@@ -69,50 +64,181 @@ spufs_mem_write(struct file *file, const char __user *buffer,
 					size_t size, loff_t *pos)
 {
 	struct spu_context *ctx = file->private_data;
-	struct spu *spu = ctx->spu;
-
-	if (spu->number & 0) //1)
-		return generic_file_write(file, buffer, size, pos);
+	char *local_store;
+	int ret;
 
 	size = min_t(ssize_t, LS_SIZE - *pos, size);
 	if (size <= 0)
 		return -EFBIG;
 	*pos += size;
-	return copy_from_user(spu->local_store + *pos - size,
-				buffer, size) ? -EFAULT : size;
+
+	spu_acquire(ctx);
+
+	local_store = ctx->ops->get_ls(ctx);
+	ret = copy_from_user(local_store + *pos - size,
+			     buffer, size) ? -EFAULT : size;
+
+	spu_release(ctx);
+	return ret;
 }
 
+#ifdef CONFIG_SPARSEMEM
+static struct page *
+spufs_mem_mmap_nopage(struct vm_area_struct *vma,
+		      unsigned long address, int *type)
+{
+	struct page *page = NOPAGE_SIGBUS;
+
+	struct spu_context *ctx = vma->vm_file->private_data;
+	unsigned long offset = address - vma->vm_start;
+	offset += vma->vm_pgoff << PAGE_SHIFT;
+
+	spu_acquire(ctx);
+
+	if (ctx->state == SPU_STATE_SAVED)
+		page = vmalloc_to_page(ctx->csa.lscsa->ls + offset);
+	else
+		page = pfn_to_page((ctx->spu->local_store_phys + offset)
+				   >> PAGE_SHIFT);
+
+	spu_release(ctx);
+
+	if (type)
+		*type = VM_FAULT_MINOR;
+
+	return page;
+}
+
+static struct vm_operations_struct spufs_mem_mmap_vmops = {
+	.nopage = spufs_mem_mmap_nopage,
+};
+
 static int
 spufs_mem_mmap(struct file *file, struct vm_area_struct *vma)
 {
-	struct spu_context *ctx = file->private_data;
-	struct spu *spu = ctx->spu;
-	unsigned long pfn;
-
-	if (spu->number & 0) //1)
-		return generic_file_mmap(file, vma);
+	if (!(vma->vm_flags & VM_SHARED))
+		return -EINVAL;
 
+	/* FIXME: */
 	vma->vm_flags |= VM_RESERVED;
-	vma->vm_page_prot = __pgprot(pgprot_val (vma->vm_page_prot)
-							| _PAGE_NO_CACHE);
-	pfn = spu->local_store_phys >> PAGE_SHIFT;
-	/*
-	 * This will work for actual SPUs, but not for vmalloc memory:
-	 */
-	if (remap_pfn_range(vma, vma->vm_start, pfn,
-				vma->vm_end-vma->vm_start, vma->vm_page_prot))
-		return -EAGAIN;
+	vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
+				     | _PAGE_NO_CACHE);
+
+	vma->vm_ops = &spufs_mem_mmap_vmops;
 	return 0;
 }
+#endif
 
 static struct file_operations spufs_mem_fops = {
 	.open	 = spufs_mem_open,
 	.read    = spufs_mem_read,
 	.write   = spufs_mem_write,
+	.llseek  = generic_file_llseek,
+#ifdef CONFIG_SPARSEMEM
 	.mmap    = spufs_mem_mmap,
+#endif
+};
+
+static int
+spufs_regs_open(struct inode *inode, struct file *file)
+{
+	struct spufs_inode_info *i = SPUFS_I(inode);
+	file->private_data = i->i_ctx;
+	return 0;
+}
+
+static ssize_t
+spufs_regs_read(struct file *file, char __user *buffer,
+		size_t size, loff_t *pos)
+{
+	struct spu_context *ctx = file->private_data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	int ret;
+
+	spu_acquire_saved(ctx);
+
+	ret = simple_read_from_buffer(buffer, size, pos,
+				      lscsa->gprs, sizeof lscsa->gprs);
+
+	spu_release(ctx);
+	return ret;
+}
+
+static ssize_t
+spufs_regs_write(struct file *file, const char __user *buffer,
+		 size_t size, loff_t *pos)
+{
+	struct spu_context *ctx = file->private_data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	int ret;
+
+	size = min_t(ssize_t, sizeof lscsa->gprs - *pos, size);
+	if (size <= 0)
+		return -EFBIG;
+	*pos += size;
+
+	spu_acquire_saved(ctx);
+
+	ret = copy_from_user(lscsa->gprs + *pos - size,
+			     buffer, size) ? -EFAULT : size;
+
+	spu_release(ctx);
+	return ret;
+}
+
+static struct file_operations spufs_regs_fops = {
+	.open	 = spufs_regs_open,
+	.read    = spufs_regs_read,
+	.write   = spufs_regs_write,
 	.llseek  = generic_file_llseek,
 };
 
+static ssize_t
+spufs_fpcr_read(struct file *file, char __user * buffer,
+		size_t size, loff_t * pos)
+{
+	struct spu_context *ctx = file->private_data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	int ret;
+
+	spu_acquire_saved(ctx);
+
+	ret = simple_read_from_buffer(buffer, size, pos,
+				      &lscsa->fpcr, sizeof(lscsa->fpcr));
+
+	spu_release(ctx);
+	return ret;
+}
+
+static ssize_t
+spufs_fpcr_write(struct file *file, const char __user * buffer,
+		 size_t size, loff_t * pos)
+{
+	struct spu_context *ctx = file->private_data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	int ret;
+
+	size = min_t(ssize_t, sizeof(lscsa->fpcr) - *pos, size);
+	if (size <= 0)
+		return -EFBIG;
+	*pos += size;
+
+	spu_acquire_saved(ctx);
+
+	ret = copy_from_user((char *)&lscsa->fpcr + *pos - size,
+			     buffer, size) ? -EFAULT : size;
+
+	spu_release(ctx);
+	return ret;
+}
+
+static struct file_operations spufs_fpcr_fops = {
+	.open = spufs_regs_open,
+	.read = spufs_fpcr_read,
+	.write = spufs_fpcr_write,
+	.llseek = generic_file_llseek,
+};
+
 /* generic open function for all pipe-like files */
 static int spufs_pipe_open(struct inode *inode, struct file *file)
 {
@@ -125,21 +251,19 @@ static int spufs_pipe_open(struct inode *inode, struct file *file)
 static ssize_t spufs_mbox_read(struct file *file, char __user *buf,
 			size_t len, loff_t *pos)
 {
-	struct spu_context *ctx;
-	struct spu_problem __iomem *prob;
-	u32 mbox_stat;
+	struct spu_context *ctx = file->private_data;
 	u32 mbox_data;
+	int ret;
 
 	if (len < 4)
 		return -EINVAL;
 
-	ctx = file->private_data;
-	prob = ctx->spu->problem;
-	mbox_stat = in_be32(&prob->mb_stat_R);
-	if (!(mbox_stat & 0x0000ff))
-		return -EAGAIN;
+	spu_acquire(ctx);
+	ret = ctx->ops->mbox_read(ctx, &mbox_data);
+	spu_release(ctx);
 
-	mbox_data = in_be32(&prob->pu_mb_R);
+	if (!ret)
+		return -EAGAIN;
 
 	if (copy_to_user(buf, &mbox_data, sizeof mbox_data))
 		return -EFAULT;
@@ -155,14 +279,17 @@ static struct file_operations spufs_mbox_fops = {
 static ssize_t spufs_mbox_stat_read(struct file *file, char __user *buf,
 			size_t len, loff_t *pos)
 {
-	struct spu_context *ctx;
+	struct spu_context *ctx = file->private_data;
 	u32 mbox_stat;
 
 	if (len < 4)
 		return -EINVAL;
 
-	ctx = file->private_data;
-	mbox_stat = in_be32(&ctx->spu->problem->mb_stat_R) & 0xff;
+	spu_acquire(ctx);
+
+	mbox_stat = ctx->ops->mbox_stat_read(ctx) & 0xff;
+
+	spu_release(ctx);
 
 	if (copy_to_user(buf, &mbox_stat, sizeof mbox_stat))
 		return -EFAULT;
@@ -175,57 +302,78 @@ static struct file_operations spufs_mbox_stat_fops = {
 	.read	= spufs_mbox_stat_read,
 };
 
+/*
+ * spufs_wait
+ * 	Same as wait_event_interruptible(), except that here
+ *	we need to call spu_release(ctx) before sleeping, and
+ *	then spu_acquire(ctx) when awoken.
+ */
+
+#define spufs_wait(wq, condition)					\
+({									\
+	int __ret = 0;							\
+	DEFINE_WAIT(__wait);						\
+	for (;;) {							\
+		prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE);	\
+		if (condition)						\
+			break;						\
+		if (!signal_pending(current)) {				\
+			spu_release(ctx);				\
+			schedule();					\
+			spu_acquire(ctx);				\
+			continue;					\
+		}							\
+		__ret = -ERESTARTSYS;					\
+		break;							\
+	}								\
+	finish_wait(&(wq), &__wait);					\
+	__ret;								\
+})
+
 /* low-level ibox access function */
-size_t spu_ibox_read(struct spu *spu, u32 *data)
+size_t spu_ibox_read(struct spu_context *ctx, u32 *data)
 {
-	int ret;
-
-	spin_lock_irq(&spu->register_lock);
+	return ctx->ops->ibox_read(ctx, data);
+}
 
-	if (in_be32(&spu->problem->mb_stat_R) & 0xff0000) {
-		/* read the first available word */
-		*data = in_be64(&spu->priv2->puint_mb_R);
-		ret = 4;
-	} else {
-		/* make sure we get woken up by the interrupt */
-		out_be64(&spu->priv1->int_mask_class2_RW,
-			in_be64(&spu->priv1->int_mask_class2_RW) | 0x1);
-		ret = 0;
-	}
+static int spufs_ibox_fasync(int fd, struct file *file, int on)
+{
+	struct spu_context *ctx = file->private_data;
 
-	spin_unlock_irq(&spu->register_lock);
-	return ret;
+	return fasync_helper(fd, file, on, &ctx->ibox_fasync);
 }
-EXPORT_SYMBOL(spu_ibox_read);
 
-static int spufs_ibox_fasync(int fd, struct file *file, int on)
+/* interrupt-level ibox callback function. */
+void spufs_ibox_callback(struct spu *spu)
 {
-	struct spu_context *ctx;
-	ctx = file->private_data;
-	return fasync_helper(fd, file, on, &ctx->spu->ibox_fasync);
+	struct spu_context *ctx = spu->ctx;
+
+	wake_up_all(&ctx->ibox_wq);
+	kill_fasync(&ctx->ibox_fasync, SIGIO, POLLIN);
 }
 
 static ssize_t spufs_ibox_read(struct file *file, char __user *buf,
 			size_t len, loff_t *pos)
 {
-	struct spu_context *ctx;
+	struct spu_context *ctx = file->private_data;
 	u32 ibox_data;
 	ssize_t ret;
 
 	if (len < 4)
 		return -EINVAL;
 
-	ctx = file->private_data;
+	spu_acquire(ctx);
 
 	ret = 0;
 	if (file->f_flags & O_NONBLOCK) {
-		if (!spu_ibox_read(ctx->spu, &ibox_data))
+		if (!spu_ibox_read(ctx, &ibox_data))
 			ret = -EAGAIN;
 	} else {
-		ret = wait_event_interruptible(ctx->spu->ibox_wq,
-				 spu_ibox_read(ctx->spu, &ibox_data));
+		ret = spufs_wait(ctx->ibox_wq, spu_ibox_read(ctx, &ibox_data));
 	}
 
+	spu_release(ctx);
+
 	if (ret)
 		return ret;
 
@@ -238,16 +386,17 @@ static ssize_t spufs_ibox_read(struct file *file, char __user *buf,
 
 static unsigned int spufs_ibox_poll(struct file *file, poll_table *wait)
 {
-	struct spu_context *ctx;
-	struct spu_problem __iomem *prob;
+	struct spu_context *ctx = file->private_data;
 	u32 mbox_stat;
 	unsigned int mask;
 
-	ctx = file->private_data;
-	prob = ctx->spu->problem;
-	mbox_stat = in_be32(&prob->mb_stat_R);
+	spu_acquire(ctx);
+
+	mbox_stat = ctx->ops->mbox_stat_read(ctx);
+
+	spu_release(ctx);
 
-	poll_wait(file, &ctx->spu->ibox_wq, wait);
+	poll_wait(file, &ctx->ibox_wq, wait);
 
 	mask = 0;
 	if (mbox_stat & 0xff0000)
@@ -266,14 +415,15 @@ static struct file_operations spufs_ibox_fops = {
 static ssize_t spufs_ibox_stat_read(struct file *file, char __user *buf,
 			size_t len, loff_t *pos)
 {
-	struct spu_context *ctx;
+	struct spu_context *ctx = file->private_data;
 	u32 ibox_stat;
 
 	if (len < 4)
 		return -EINVAL;
 
-	ctx = file->private_data;
-	ibox_stat = (in_be32(&ctx->spu->problem->mb_stat_R) >> 16) & 0xff;
+	spu_acquire(ctx);
+	ibox_stat = (ctx->ops->mbox_stat_read(ctx) >> 16) & 0xff;
+	spu_release(ctx);
 
 	if (copy_to_user(buf, &ibox_stat, sizeof ibox_stat))
 		return -EFAULT;
@@ -287,75 +437,69 @@ static struct file_operations spufs_ibox_stat_fops = {
 };
 
 /* low-level mailbox write */
-size_t spu_wbox_write(struct spu *spu, u32 data)
+size_t spu_wbox_write(struct spu_context *ctx, u32 data)
 {
-	int ret;
+	return ctx->ops->wbox_write(ctx, data);
+}
 
-	spin_lock_irq(&spu->register_lock);
+static int spufs_wbox_fasync(int fd, struct file *file, int on)
+{
+	struct spu_context *ctx = file->private_data;
+	int ret;
 
-	if (in_be32(&spu->problem->mb_stat_R) & 0x00ff00) {
-		/* we have space to write wbox_data to */
-		out_be32(&spu->problem->spu_mb_W, data);
-		ret = 4;
-	} else {
-		/* make sure we get woken up by the interrupt when space
-		   becomes available */
-		out_be64(&spu->priv1->int_mask_class2_RW,
-			in_be64(&spu->priv1->int_mask_class2_RW) | 0x10);
-		ret = 0;
-	}
+	ret = fasync_helper(fd, file, on, &ctx->wbox_fasync);
 
-	spin_unlock_irq(&spu->register_lock);
 	return ret;
 }
-EXPORT_SYMBOL(spu_wbox_write);
 
-static int spufs_wbox_fasync(int fd, struct file *file, int on)
+/* interrupt-level wbox callback function. */
+void spufs_wbox_callback(struct spu *spu)
 {
-	struct spu_context *ctx;
-	ctx = file->private_data;
-	return fasync_helper(fd, file, on, &ctx->spu->wbox_fasync);
+	struct spu_context *ctx = spu->ctx;
+
+	wake_up_all(&ctx->wbox_wq);
+	kill_fasync(&ctx->wbox_fasync, SIGIO, POLLOUT);
 }
 
 static ssize_t spufs_wbox_write(struct file *file, const char __user *buf,
 			size_t len, loff_t *pos)
 {
-	struct spu_context *ctx;
+	struct spu_context *ctx = file->private_data;
 	u32 wbox_data;
 	int ret;
 
 	if (len < 4)
 		return -EINVAL;
 
-	ctx = file->private_data;
-
 	if (copy_from_user(&wbox_data, buf, sizeof wbox_data))
 		return -EFAULT;
 
+	spu_acquire(ctx);
+
 	ret = 0;
 	if (file->f_flags & O_NONBLOCK) {
-		if (!spu_wbox_write(ctx->spu, wbox_data))
+		if (!spu_wbox_write(ctx, wbox_data))
 			ret = -EAGAIN;
 	} else {
-		ret = wait_event_interruptible(ctx->spu->wbox_wq,
-			spu_wbox_write(ctx->spu, wbox_data));
+		ret = spufs_wait(ctx->wbox_wq, spu_wbox_write(ctx, wbox_data));
 	}
 
+	spu_release(ctx);
+
 	return ret ? ret : sizeof wbox_data;
 }
 
 static unsigned int spufs_wbox_poll(struct file *file, poll_table *wait)
 {
-	struct spu_context *ctx;
-	struct spu_problem __iomem *prob;
+	struct spu_context *ctx = file->private_data;
 	u32 mbox_stat;
 	unsigned int mask;
 
-	ctx = file->private_data;
-	prob = ctx->spu->problem;
-	mbox_stat = in_be32(&prob->mb_stat_R);
+	spu_acquire(ctx);
+	mbox_stat = ctx->ops->mbox_stat_read(ctx);
+	spu_release(ctx);
 
-	poll_wait(file, &ctx->spu->wbox_wq, wait);
+	poll_wait(file, &ctx->wbox_wq, wait);
 
 	mask = 0;
 	if (mbox_stat & 0x00ff00)
@@ -374,14 +518,15 @@ static struct file_operations spufs_wbox_fops = {
 static ssize_t spufs_wbox_stat_read(struct file *file, char __user *buf,
 			size_t len, loff_t *pos)
 {
-	struct spu_context *ctx;
+	struct spu_context *ctx = file->private_data;
 	u32 wbox_stat;
 
 	if (len < 4)
 		return -EINVAL;
 
-	ctx = file->private_data;
-	wbox_stat = (in_be32(&ctx->spu->problem->mb_stat_R) >> 8) & 0xff;
+	spu_acquire(ctx);
+	wbox_stat = (ctx->ops->mbox_stat_read(ctx) >> 8) & 0xff;
+	spu_release(ctx);
 
 	if (copy_to_user(buf, &wbox_stat, sizeof wbox_stat))
 		return -EFAULT;
@@ -395,47 +540,41 @@ static struct file_operations spufs_wbox_stat_fops = {
 };
 
 long spufs_run_spu(struct file *file, struct spu_context *ctx,
-		u32 *npc, u32 *status)
+				u32 *npc, u32 *status)
 {
-	struct spu_problem __iomem *prob;
 	int ret;
 
-	if (file->f_flags & O_NONBLOCK) {
-		ret = -EAGAIN;
-		if (!down_write_trylock(&ctx->backing_sema))
-			goto out;
-	} else {
-		down_write(&ctx->backing_sema);
-	}
+	ret = spu_acquire_runnable(ctx);
+	if (ret)
+		return ret;
 
-	prob = ctx->spu->problem;
-	out_be32(&prob->spu_npc_RW, *npc);
+	ctx->ops->npc_write(ctx, *npc);
 
 	ret = spu_run(ctx->spu);
 
-	*status = in_be32(&prob->spu_status_R);
-	*npc = in_be32(&prob->spu_npc_RW);
+	if (!ret)
+		ret = ctx->ops->status_read(ctx);
 
-	up_write(&ctx->backing_sema);
+	*npc = ctx->ops->npc_read(ctx);
 
-out:
+	spu_release(ctx);
+	spu_yield(ctx);
 	return ret;
 }
 
 static ssize_t spufs_signal1_read(struct file *file, char __user *buf,
 			size_t len, loff_t *pos)
 {
-	struct spu_context *ctx;
-	struct spu_problem *prob;
+	struct spu_context *ctx = file->private_data;
 	u32 data;
 
-	ctx = file->private_data;
-	prob = ctx->spu->problem;
-
 	if (len < 4)
 		return -EINVAL;
 
-	data = in_be32(&prob->signal_notify1);
+	spu_acquire(ctx);
+	data = ctx->ops->signal1_read(ctx);
+	spu_release(ctx);
+
 	if (copy_to_user(buf, &data, 4))
 		return -EFAULT;
 
@@ -446,11 +585,9 @@ static ssize_t spufs_signal1_write(struct file *file, const char __user *buf,
 			size_t len, loff_t *pos)
 {
 	struct spu_context *ctx;
-	struct spu_problem *prob;
 	u32 data;
 
 	ctx = file->private_data;
-	prob = ctx->spu->problem;
 
 	if (len < 4)
 		return -EINVAL;
@@ -458,7 +595,9 @@ static ssize_t spufs_signal1_write(struct file *file, const char __user *buf,
 	if (copy_from_user(&data, buf, 4))
 		return -EFAULT;
 
-	out_be32(&prob->signal_notify1, data);
+	spu_acquire(ctx);
+	ctx->ops->signal1_write(ctx, data);
+	spu_release(ctx);
 
 	return 4;
 }
@@ -473,16 +612,17 @@ static ssize_t spufs_signal2_read(struct file *file, char __user *buf,
 			size_t len, loff_t *pos)
 {
 	struct spu_context *ctx;
-	struct spu_problem *prob;
 	u32 data;
 
 	ctx = file->private_data;
-	prob = ctx->spu->problem;
 
 	if (len < 4)
 		return -EINVAL;
 
-	data = in_be32(&prob->signal_notify2);
+	spu_acquire(ctx);
+	data = ctx->ops->signal2_read(ctx);
+	spu_release(ctx);
+
 	if (copy_to_user(buf, &data, 4))
 		return -EFAULT;
 
@@ -493,11 +633,9 @@ static ssize_t spufs_signal2_write(struct file *file, const char __user *buf,
 			size_t len, loff_t *pos)
 {
 	struct spu_context *ctx;
-	struct spu_problem *prob;
 	u32 data;
 
 	ctx = file->private_data;
-	prob = ctx->spu->problem;
 
 	if (len < 4)
 		return -EINVAL;
@@ -505,7 +643,9 @@ static ssize_t spufs_signal2_write(struct file *file, const char __user *buf,
 	if (copy_from_user(&data, buf, 4))
 		return -EFAULT;
 
-	out_be32(&prob->signal_notify2, data);
+	spu_acquire(ctx);
+	ctx->ops->signal2_write(ctx, data);
+	spu_release(ctx);
 
 	return 4;
 }
@@ -519,23 +659,22 @@ static struct file_operations spufs_signal2_fops = {
 static void spufs_signal1_type_set(void *data, u64 val)
 {
 	struct spu_context *ctx = data;
-	struct spu_priv2 *priv2 = ctx->spu->priv2;
-	u64 tmp;
 
-	spin_lock_irq(&ctx->spu->register_lock);
-	tmp = in_be64(&priv2->spu_cfg_RW);
-	if (val)
-		tmp |= 1;
-	else
-		tmp &= ~1;
-	out_be64(&priv2->spu_cfg_RW, tmp);
-	spin_unlock_irq(&ctx->spu->register_lock);
+	spu_acquire(ctx);
+	ctx->ops->signal1_type_set(ctx, val);
+	spu_release(ctx);
 }
 
 static u64 spufs_signal1_type_get(void *data)
 {
 	struct spu_context *ctx = data;
-	return (in_be64(&ctx->spu->priv2->spu_cfg_RW) & 1) != 0;
+	u64 ret;
+
+	spu_acquire(ctx);
+	ret = ctx->ops->signal1_type_get(ctx);
+	spu_release(ctx);
+
+	return ret;
 }
 DEFINE_SIMPLE_ATTRIBUTE(spufs_signal1_type, spufs_signal1_type_get,
 					spufs_signal1_type_set, "%llu");
@@ -543,23 +682,22 @@ DEFINE_SIMPLE_ATTRIBUTE(spufs_signal1_type, spufs_signal1_type_get,
 static void spufs_signal2_type_set(void *data, u64 val)
 {
 	struct spu_context *ctx = data;
-	struct spu_priv2 *priv2 = ctx->spu->priv2;
-	u64 tmp;
 
-	spin_lock_irq(&ctx->spu->register_lock);
-	tmp = in_be64(&priv2->spu_cfg_RW);
-	if (val)
-		tmp |= 2;
-	else
-		tmp &= ~2;
-	out_be64(&priv2->spu_cfg_RW, tmp);
-	spin_unlock_irq(&ctx->spu->register_lock);
+	spu_acquire(ctx);
+	ctx->ops->signal2_type_set(ctx, val);
+	spu_release(ctx);
 }
 
 static u64 spufs_signal2_type_get(void *data)
 {
 	struct spu_context *ctx = data;
-	return (in_be64(&ctx->spu->priv2->spu_cfg_RW) & 2) != 0;
+	u64 ret;
+
+	spu_acquire(ctx);
+	ret = ctx->ops->signal2_type_get(ctx);
+	spu_release(ctx);
+
+	return ret;
 }
 DEFINE_SIMPLE_ATTRIBUTE(spufs_signal2_type, spufs_signal2_type_get,
 					spufs_signal2_type_set, "%llu");
@@ -567,20 +705,135 @@ DEFINE_SIMPLE_ATTRIBUTE(spufs_signal2_type, spufs_signal2_type_get,
 static void spufs_npc_set(void *data, u64 val)
 {
 	struct spu_context *ctx = data;
-	out_be32(&ctx->spu->problem->spu_npc_RW, val);
+	spu_acquire(ctx);
+	ctx->ops->npc_write(ctx, val);
+	spu_release(ctx);
 }
 
 static u64 spufs_npc_get(void *data)
 {
 	struct spu_context *ctx = data;
 	u64 ret;
-	ret = in_be32(&ctx->spu->problem->spu_npc_RW);
+	spu_acquire(ctx);
+	ret = ctx->ops->npc_read(ctx);
+	spu_release(ctx);
 	return ret;
 }
 DEFINE_SIMPLE_ATTRIBUTE(spufs_npc_ops, spufs_npc_get, spufs_npc_set, "%llx\n")
 
+static void spufs_decr_set(void *data, u64 val)
+{
+	struct spu_context *ctx = data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	spu_acquire_saved(ctx);
+	lscsa->decr.slot[0] = (u32) val;
+	spu_release(ctx);
+}
+
+static u64 spufs_decr_get(void *data)
+{
+	struct spu_context *ctx = data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	u64 ret;
+	spu_acquire_saved(ctx);
+	ret = lscsa->decr.slot[0];
+	spu_release(ctx);
+	return ret;
+}
+DEFINE_SIMPLE_ATTRIBUTE(spufs_decr_ops, spufs_decr_get, spufs_decr_set,
+			"%llx\n")
+
+static void spufs_decr_status_set(void *data, u64 val)
+{
+	struct spu_context *ctx = data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	spu_acquire_saved(ctx);
+	lscsa->decr_status.slot[0] = (u32) val;
+	spu_release(ctx);
+}
+
+static u64 spufs_decr_status_get(void *data)
+{
+	struct spu_context *ctx = data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	u64 ret;
+	spu_acquire_saved(ctx);
+	ret = lscsa->decr_status.slot[0];
+	spu_release(ctx);
+	return ret;
+}
+DEFINE_SIMPLE_ATTRIBUTE(spufs_decr_status_ops, spufs_decr_status_get,
+			spufs_decr_status_set, "%llx\n")
+
+static void spufs_spu_tag_mask_set(void *data, u64 val)
+{
+	struct spu_context *ctx = data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	spu_acquire_saved(ctx);
+	lscsa->tag_mask.slot[0] = (u32) val;
+	spu_release(ctx);
+}
+
+static u64 spufs_spu_tag_mask_get(void *data)
+{
+	struct spu_context *ctx = data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	u64 ret;
+	spu_acquire_saved(ctx);
+	ret = lscsa->tag_mask.slot[0];
+	spu_release(ctx);
+	return ret;
+}
+DEFINE_SIMPLE_ATTRIBUTE(spufs_spu_tag_mask_ops, spufs_spu_tag_mask_get,
+			spufs_spu_tag_mask_set, "%llx\n")
+
+static void spufs_event_mask_set(void *data, u64 val)
+{
+	struct spu_context *ctx = data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	spu_acquire_saved(ctx);
+	lscsa->event_mask.slot[0] = (u32) val;
+	spu_release(ctx);
+}
+
+static u64 spufs_event_mask_get(void *data)
+{
+	struct spu_context *ctx = data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	u64 ret;
+	spu_acquire_saved(ctx);
+	ret = lscsa->event_mask.slot[0];
+	spu_release(ctx);
+	return ret;
+}
+DEFINE_SIMPLE_ATTRIBUTE(spufs_event_mask_ops, spufs_event_mask_get,
+			spufs_event_mask_set, "%llx\n")
+
+static void spufs_srr0_set(void *data, u64 val)
+{
+	struct spu_context *ctx = data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	spu_acquire_saved(ctx);
+	lscsa->srr0.slot[0] = (u32) val;
+	spu_release(ctx);
+}
+
+static u64 spufs_srr0_get(void *data)
+{
+	struct spu_context *ctx = data;
+	struct spu_lscsa *lscsa = ctx->csa.lscsa;
+	u64 ret;
+	spu_acquire_saved(ctx);
+	ret = lscsa->srr0.slot[0];
+	spu_release(ctx);
+	return ret;
+}
+DEFINE_SIMPLE_ATTRIBUTE(spufs_srr0_ops, spufs_srr0_get, spufs_srr0_set,
+			"%llx\n")
+
 struct tree_descr spufs_dir_contents[] = {
 	{ "mem",  &spufs_mem_fops,  0666, },
+	{ "regs", &spufs_regs_fops,  0666, },
 	{ "mbox", &spufs_mbox_fops, 0444, },
 	{ "ibox", &spufs_ibox_fops, 0444, },
 	{ "wbox", &spufs_wbox_fops, 0222, },
@@ -592,5 +845,11 @@ struct tree_descr spufs_dir_contents[] = {
 	{ "signal1_type", &spufs_signal1_type, 0666, },
 	{ "signal2_type", &spufs_signal2_type, 0666, },
 	{ "npc", &spufs_npc_ops, 0666, },
+	{ "fpcr", &spufs_fpcr_fops, 0666, },
+	{ "decr", &spufs_decr_ops, 0666, },
+	{ "decr_status", &spufs_decr_status_ops, 0666, },
+	{ "spu_tag_mask", &spufs_spu_tag_mask_ops, 0666, },
+	{ "event_mask", &spufs_event_mask_ops, 0666, },
+	{ "srr0", &spufs_srr0_ops, 0666, },
 	{},
 };