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authorArnd Bergmann <arnd@arndb.de>2006-10-04 17:26:19 +0200
committerPaul Mackerras <paulus@samba.org>2006-10-05 09:21:01 +1000
commite1dbff2bafa83f839ef15f51904b0cce9fc89387 (patch)
treedac3c6bfd2789eae23286b5485d7010de10eefa6
parent772920e594df25f2011ca49abd9c8b85c4820cdc (diff)
downloadlinux-linaro-e1dbff2bafa83f839ef15f51904b0cce9fc89387.tar.gz
[POWERPC] spufs: add support for read/write on cntl
Writing to cntl can be used to stop execution on the spu and to restart it, reading from cntl gives the contents of the current status register. The access is always in ascii, as for most other files. This was always meant to be there, but we had a little problem with writing to runctl so it was left out so far. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/platforms/cell/spufs/file.c44
1 files changed, 25 insertions, 19 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index b4d38cb65f1..e2c9d48a680 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -211,37 +211,43 @@ static int spufs_cntl_mmap(struct file *file, struct vm_area_struct *vma)
#define spufs_cntl_mmap NULL
#endif /* !SPUFS_MMAP_4K */
-static int spufs_cntl_open(struct inode *inode, struct file *file)
+static u64 spufs_cntl_get(void *data)
{
- struct spufs_inode_info *i = SPUFS_I(inode);
- struct spu_context *ctx = i->i_ctx;
+ struct spu_context *ctx = data;
+ u64 val;
- file->private_data = ctx;
- file->f_mapping = inode->i_mapping;
- ctx->cntl = inode->i_mapping;
- return 0;
+ spu_acquire(ctx);
+ val = ctx->ops->status_read(ctx);
+ spu_release(ctx);
+
+ return val;
}
-static ssize_t
-spufs_cntl_read(struct file *file, char __user *buffer,
- size_t size, loff_t *pos)
+static void spufs_cntl_set(void *data, u64 val)
{
- /* FIXME: read from spu status */
- return -EINVAL;
+ struct spu_context *ctx = data;
+
+ spu_acquire(ctx);
+ ctx->ops->runcntl_write(ctx, val);
+ spu_release(ctx);
}
-static ssize_t
-spufs_cntl_write(struct file *file, const char __user *buffer,
- size_t size, loff_t *pos)
+static int spufs_cntl_open(struct inode *inode, struct file *file)
{
- /* FIXME: write to runctl bit */
- return -EINVAL;
+ struct spufs_inode_info *i = SPUFS_I(inode);
+ struct spu_context *ctx = i->i_ctx;
+
+ file->private_data = ctx;
+ file->f_mapping = inode->i_mapping;
+ ctx->cntl = inode->i_mapping;
+ return simple_attr_open(inode, file, spufs_cntl_get,
+ spufs_cntl_set, "0x%08lx");
}
static struct file_operations spufs_cntl_fops = {
.open = spufs_cntl_open,
- .read = spufs_cntl_read,
- .write = spufs_cntl_write,
+ .read = simple_attr_read,
+ .write = simple_attr_write,
.mmap = spufs_cntl_mmap,
};