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[POWERPC] spufs: add enchanced simple attr macros
The simple attr macros currently used by spufs can't deal with the handlers returning errors, which is required to make the state_mutex interruptible. This adds a local copy that allows for an error return from the get/set handlers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Christoph Hellwig
Paul Mackerras
parent
e65c2f6fce
commit
197b1a8263
@ -40,6 +40,120 @@
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#define SPUFS_MMAP_4K (PAGE_SIZE == 0x1000)
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/* Simple attribute files */
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struct spufs_attr {
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int (*get)(void *, u64 *);
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int (*set)(void *, u64);
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char get_buf[24]; /* enough to store a u64 and "\n\0" */
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char set_buf[24];
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void *data;
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const char *fmt; /* format for read operation */
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struct mutex mutex; /* protects access to these buffers */
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};
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static int spufs_attr_open(struct inode *inode, struct file *file,
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int (*get)(void *, u64 *), int (*set)(void *, u64),
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const char *fmt)
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{
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struct spufs_attr *attr;
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attr = kmalloc(sizeof(*attr), GFP_KERNEL);
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if (!attr)
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return -ENOMEM;
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attr->get = get;
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attr->set = set;
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attr->data = inode->i_private;
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attr->fmt = fmt;
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mutex_init(&attr->mutex);
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file->private_data = attr;
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return nonseekable_open(inode, file);
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}
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static int spufs_attr_release(struct inode *inode, struct file *file)
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{
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kfree(file->private_data);
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return 0;
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}
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static ssize_t spufs_attr_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos)
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{
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struct spufs_attr *attr;
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size_t size;
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ssize_t ret;
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attr = file->private_data;
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if (!attr->get)
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return -EACCES;
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ret = mutex_lock_interruptible(&attr->mutex);
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if (ret)
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return ret;
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if (*ppos) { /* continued read */
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size = strlen(attr->get_buf);
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} else { /* first read */
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u64 val;
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ret = attr->get(attr->data, &val);
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if (ret)
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goto out;
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size = scnprintf(attr->get_buf, sizeof(attr->get_buf),
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attr->fmt, (unsigned long long)val);
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}
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ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size);
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out:
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mutex_unlock(&attr->mutex);
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return ret;
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}
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static ssize_t spufs_attr_write(struct file *file, const char __user *buf,
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size_t len, loff_t *ppos)
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{
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struct spufs_attr *attr;
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u64 val;
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size_t size;
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ssize_t ret;
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attr = file->private_data;
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if (!attr->set)
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return -EACCES;
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ret = mutex_lock_interruptible(&attr->mutex);
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if (ret)
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return ret;
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ret = -EFAULT;
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size = min(sizeof(attr->set_buf) - 1, len);
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if (copy_from_user(attr->set_buf, buf, size))
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goto out;
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ret = len; /* claim we got the whole input */
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attr->set_buf[size] = '\0';
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val = simple_strtol(attr->set_buf, NULL, 0);
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attr->set(attr->data, val);
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out:
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mutex_unlock(&attr->mutex);
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return ret;
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}
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#define DEFINE_SPUFS_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
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static int __fops ## _open(struct inode *inode, struct file *file) \
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{ \
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__simple_attr_check_format(__fmt, 0ull); \
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return spufs_attr_open(inode, file, __get, __set, __fmt); \
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} \
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static struct file_operations __fops = { \
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.owner = THIS_MODULE, \
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.open = __fops ## _open, \
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.release = spufs_attr_release, \
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.read = spufs_attr_read, \
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.write = spufs_attr_write, \
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};
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static int
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spufs_mem_open(struct inode *inode, struct file *file)
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@ -296,25 +410,26 @@ static int spufs_cntl_mmap(struct file *file, struct vm_area_struct *vma)
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#define spufs_cntl_mmap NULL
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#endif /* !SPUFS_MMAP_4K */
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static u64 spufs_cntl_get(void *data)
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static int spufs_cntl_get(void *data, u64 *val)
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{
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struct spu_context *ctx = data;
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u64 val;
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spu_acquire(ctx);
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val = ctx->ops->status_read(ctx);
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*val = ctx->ops->status_read(ctx);
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spu_release(ctx);
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return val;
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return 0;
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}
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static void spufs_cntl_set(void *data, u64 val)
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static int spufs_cntl_set(void *data, u64 val)
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{
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struct spu_context *ctx = data;
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spu_acquire(ctx);
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ctx->ops->runcntl_write(ctx, val);
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spu_release(ctx);
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return 0;
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}
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static int spufs_cntl_open(struct inode *inode, struct file *file)
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@ -327,7 +442,7 @@ static int spufs_cntl_open(struct inode *inode, struct file *file)
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if (!i->i_openers++)
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ctx->cntl = inode->i_mapping;
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mutex_unlock(&ctx->mapping_lock);
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return simple_attr_open(inode, file, spufs_cntl_get,
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return spufs_attr_open(inode, file, spufs_cntl_get,
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spufs_cntl_set, "0x%08lx");
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}
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@ -337,7 +452,7 @@ spufs_cntl_release(struct inode *inode, struct file *file)
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struct spufs_inode_info *i = SPUFS_I(inode);
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struct spu_context *ctx = i->i_ctx;
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simple_attr_close(inode, file);
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spufs_attr_release(inode, file);
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mutex_lock(&ctx->mapping_lock);
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if (!--i->i_openers)
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@ -349,8 +464,8 @@ spufs_cntl_release(struct inode *inode, struct file *file)
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static const struct file_operations spufs_cntl_fops = {
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.open = spufs_cntl_open,
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.release = spufs_cntl_release,
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.read = simple_attr_read,
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.write = simple_attr_write,
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.read = spufs_attr_read,
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.write = spufs_attr_write,
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.mmap = spufs_cntl_mmap,
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};
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@ -1102,33 +1217,34 @@ static const struct file_operations spufs_signal2_nosched_fops = {
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#define SPU_ATTR_ACQUIRE_SAVED 2
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#define DEFINE_SPUFS_ATTRIBUTE(__name, __get, __set, __fmt, __acquire) \
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static u64 __##__get(void *data) \
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static int __##__get(void *data, u64 *val) \
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{ \
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struct spu_context *ctx = data; \
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u64 ret; \
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\
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if (__acquire == SPU_ATTR_ACQUIRE) { \
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spu_acquire(ctx); \
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ret = __get(ctx); \
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*val = __get(ctx); \
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spu_release(ctx); \
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} else if (__acquire == SPU_ATTR_ACQUIRE_SAVED) { \
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spu_acquire_saved(ctx); \
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ret = __get(ctx); \
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*val = __get(ctx); \
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spu_release_saved(ctx); \
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} else \
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ret = __get(ctx); \
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*val = __get(ctx); \
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\
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return ret; \
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return 0; \
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} \
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DEFINE_SIMPLE_ATTRIBUTE(__name, __##__get, __set, __fmt);
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DEFINE_SPUFS_SIMPLE_ATTRIBUTE(__name, __##__get, __set, __fmt);
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static void spufs_signal1_type_set(void *data, u64 val)
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static int spufs_signal1_type_set(void *data, u64 val)
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{
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struct spu_context *ctx = data;
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spu_acquire(ctx);
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ctx->ops->signal1_type_set(ctx, val);
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spu_release(ctx);
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return 0;
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}
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static u64 spufs_signal1_type_get(struct spu_context *ctx)
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@ -1139,13 +1255,15 @@ DEFINE_SPUFS_ATTRIBUTE(spufs_signal1_type, spufs_signal1_type_get,
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spufs_signal1_type_set, "%llu", SPU_ATTR_ACQUIRE);
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static void spufs_signal2_type_set(void *data, u64 val)
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static int spufs_signal2_type_set(void *data, u64 val)
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{
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struct spu_context *ctx = data;
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spu_acquire(ctx);
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ctx->ops->signal2_type_set(ctx, val);
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spu_release(ctx);
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return 0;
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}
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static u64 spufs_signal2_type_get(struct spu_context *ctx)
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@ -1625,12 +1743,14 @@ static const struct file_operations spufs_mfc_fops = {
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.mmap = spufs_mfc_mmap,
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};
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static void spufs_npc_set(void *data, u64 val)
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static int spufs_npc_set(void *data, u64 val)
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{
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struct spu_context *ctx = data;
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spu_acquire(ctx);
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ctx->ops->npc_write(ctx, val);
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spu_release(ctx);
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return 0;
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}
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static u64 spufs_npc_get(struct spu_context *ctx)
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@ -1640,13 +1760,15 @@ static u64 spufs_npc_get(struct spu_context *ctx)
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DEFINE_SPUFS_ATTRIBUTE(spufs_npc_ops, spufs_npc_get, spufs_npc_set,
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"0x%llx\n", SPU_ATTR_ACQUIRE);
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static void spufs_decr_set(void *data, u64 val)
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static int spufs_decr_set(void *data, u64 val)
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{
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struct spu_context *ctx = data;
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struct spu_lscsa *lscsa = ctx->csa.lscsa;
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spu_acquire_saved(ctx);
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lscsa->decr.slot[0] = (u32) val;
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spu_release_saved(ctx);
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return 0;
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}
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static u64 spufs_decr_get(struct spu_context *ctx)
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@ -1657,7 +1779,7 @@ static u64 spufs_decr_get(struct spu_context *ctx)
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DEFINE_SPUFS_ATTRIBUTE(spufs_decr_ops, spufs_decr_get, spufs_decr_set,
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"0x%llx\n", SPU_ATTR_ACQUIRE_SAVED);
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static void spufs_decr_status_set(void *data, u64 val)
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static int spufs_decr_status_set(void *data, u64 val)
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{
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struct spu_context *ctx = data;
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spu_acquire_saved(ctx);
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@ -1666,6 +1788,8 @@ static void spufs_decr_status_set(void *data, u64 val)
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else
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ctx->csa.priv2.mfc_control_RW &= ~MFC_CNTL_DECREMENTER_RUNNING;
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spu_release_saved(ctx);
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return 0;
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}
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static u64 spufs_decr_status_get(struct spu_context *ctx)
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@ -1679,13 +1803,15 @@ DEFINE_SPUFS_ATTRIBUTE(spufs_decr_status_ops, spufs_decr_status_get,
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spufs_decr_status_set, "0x%llx\n",
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SPU_ATTR_ACQUIRE_SAVED);
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static void spufs_event_mask_set(void *data, u64 val)
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static int spufs_event_mask_set(void *data, u64 val)
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{
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struct spu_context *ctx = data;
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struct spu_lscsa *lscsa = ctx->csa.lscsa;
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spu_acquire_saved(ctx);
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lscsa->event_mask.slot[0] = (u32) val;
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spu_release_saved(ctx);
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return 0;
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}
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static u64 spufs_event_mask_get(struct spu_context *ctx)
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@ -1710,13 +1836,15 @@ static u64 spufs_event_status_get(struct spu_context *ctx)
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DEFINE_SPUFS_ATTRIBUTE(spufs_event_status_ops, spufs_event_status_get,
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NULL, "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED)
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static void spufs_srr0_set(void *data, u64 val)
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static int spufs_srr0_set(void *data, u64 val)
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{
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struct spu_context *ctx = data;
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struct spu_lscsa *lscsa = ctx->csa.lscsa;
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spu_acquire_saved(ctx);
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lscsa->srr0.slot[0] = (u32) val;
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spu_release_saved(ctx);
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return 0;
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}
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static u64 spufs_srr0_get(struct spu_context *ctx)
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@ -1747,10 +1875,12 @@ static u64 spufs_object_id_get(struct spu_context *ctx)
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return ctx->object_id;
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}
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static void spufs_object_id_set(void *data, u64 id)
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static int spufs_object_id_set(void *data, u64 id)
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{
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struct spu_context *ctx = data;
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ctx->object_id = id;
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return 0;
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}
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DEFINE_SPUFS_ATTRIBUTE(spufs_object_id_ops, spufs_object_id_get,
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