From: Christoph Hellwig Date: Thu, 20 Dec 2007 07:39:59 +0000 (+0900) Subject: [POWERPC] spufs: add enchanced simple attr macros X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=197b1a8263bf365d2ca8aba532352036ff95e04d;p=openwrt%2Fstaging%2Fblogic.git [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 Signed-off-by: Jeremy Kerr Signed-off-by: Paul Mackerras --- diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c index 78df905743b3..510adc57af90 100644 --- a/arch/powerpc/platforms/cell/spufs/file.c +++ b/arch/powerpc/platforms/cell/spufs/file.c @@ -40,6 +40,120 @@ #define SPUFS_MMAP_4K (PAGE_SIZE == 0x1000) +/* Simple attribute files */ +struct spufs_attr { + int (*get)(void *, u64 *); + int (*set)(void *, u64); + char get_buf[24]; /* enough to store a u64 and "\n\0" */ + char set_buf[24]; + void *data; + const char *fmt; /* format for read operation */ + struct mutex mutex; /* protects access to these buffers */ +}; + +static int spufs_attr_open(struct inode *inode, struct file *file, + int (*get)(void *, u64 *), int (*set)(void *, u64), + const char *fmt) +{ + struct spufs_attr *attr; + + attr = kmalloc(sizeof(*attr), GFP_KERNEL); + if (!attr) + return -ENOMEM; + + attr->get = get; + attr->set = set; + attr->data = inode->i_private; + attr->fmt = fmt; + mutex_init(&attr->mutex); + file->private_data = attr; + + return nonseekable_open(inode, file); +} + +static int spufs_attr_release(struct inode *inode, struct file *file) +{ + kfree(file->private_data); + return 0; +} + +static ssize_t spufs_attr_read(struct file *file, char __user *buf, + size_t len, loff_t *ppos) +{ + struct spufs_attr *attr; + size_t size; + ssize_t ret; + + attr = file->private_data; + if (!attr->get) + return -EACCES; + + ret = mutex_lock_interruptible(&attr->mutex); + if (ret) + return ret; + + if (*ppos) { /* continued read */ + size = strlen(attr->get_buf); + } else { /* first read */ + u64 val; + ret = attr->get(attr->data, &val); + if (ret) + goto out; + + size = scnprintf(attr->get_buf, sizeof(attr->get_buf), + attr->fmt, (unsigned long long)val); + } + + ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size); +out: + mutex_unlock(&attr->mutex); + return ret; +} + +static ssize_t spufs_attr_write(struct file *file, const char __user *buf, + size_t len, loff_t *ppos) +{ + struct spufs_attr *attr; + u64 val; + size_t size; + ssize_t ret; + + attr = file->private_data; + if (!attr->set) + return -EACCES; + + ret = mutex_lock_interruptible(&attr->mutex); + if (ret) + return ret; + + ret = -EFAULT; + size = min(sizeof(attr->set_buf) - 1, len); + if (copy_from_user(attr->set_buf, buf, size)) + goto out; + + ret = len; /* claim we got the whole input */ + attr->set_buf[size] = '\0'; + val = simple_strtol(attr->set_buf, NULL, 0); + attr->set(attr->data, val); +out: + mutex_unlock(&attr->mutex); + return ret; +} + +#define DEFINE_SPUFS_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ +static int __fops ## _open(struct inode *inode, struct file *file) \ +{ \ + __simple_attr_check_format(__fmt, 0ull); \ + return spufs_attr_open(inode, file, __get, __set, __fmt); \ +} \ +static struct file_operations __fops = { \ + .owner = THIS_MODULE, \ + .open = __fops ## _open, \ + .release = spufs_attr_release, \ + .read = spufs_attr_read, \ + .write = spufs_attr_write, \ +}; + static int spufs_mem_open(struct inode *inode, struct file *file) @@ -296,25 +410,26 @@ static int spufs_cntl_mmap(struct file *file, struct vm_area_struct *vma) #define spufs_cntl_mmap NULL #endif /* !SPUFS_MMAP_4K */ -static u64 spufs_cntl_get(void *data) +static int spufs_cntl_get(void *data, u64 *val) { struct spu_context *ctx = data; - u64 val; spu_acquire(ctx); - val = ctx->ops->status_read(ctx); + *val = ctx->ops->status_read(ctx); spu_release(ctx); - return val; + return 0; } -static void spufs_cntl_set(void *data, u64 val) +static int spufs_cntl_set(void *data, u64 val) { struct spu_context *ctx = data; spu_acquire(ctx); ctx->ops->runcntl_write(ctx, val); spu_release(ctx); + + return 0; } static int spufs_cntl_open(struct inode *inode, struct file *file) @@ -327,7 +442,7 @@ static int spufs_cntl_open(struct inode *inode, struct file *file) if (!i->i_openers++) ctx->cntl = inode->i_mapping; mutex_unlock(&ctx->mapping_lock); - return simple_attr_open(inode, file, spufs_cntl_get, + return spufs_attr_open(inode, file, spufs_cntl_get, spufs_cntl_set, "0x%08lx"); } @@ -337,7 +452,7 @@ spufs_cntl_release(struct inode *inode, struct file *file) struct spufs_inode_info *i = SPUFS_I(inode); struct spu_context *ctx = i->i_ctx; - simple_attr_close(inode, file); + spufs_attr_release(inode, file); mutex_lock(&ctx->mapping_lock); if (!--i->i_openers) @@ -349,8 +464,8 @@ spufs_cntl_release(struct inode *inode, struct file *file) static const struct file_operations spufs_cntl_fops = { .open = spufs_cntl_open, .release = spufs_cntl_release, - .read = simple_attr_read, - .write = simple_attr_write, + .read = spufs_attr_read, + .write = spufs_attr_write, .mmap = spufs_cntl_mmap, }; @@ -1102,33 +1217,34 @@ static const struct file_operations spufs_signal2_nosched_fops = { #define SPU_ATTR_ACQUIRE_SAVED 2 #define DEFINE_SPUFS_ATTRIBUTE(__name, __get, __set, __fmt, __acquire) \ -static u64 __##__get(void *data) \ +static int __##__get(void *data, u64 *val) \ { \ struct spu_context *ctx = data; \ - u64 ret; \ \ if (__acquire == SPU_ATTR_ACQUIRE) { \ spu_acquire(ctx); \ - ret = __get(ctx); \ + *val = __get(ctx); \ spu_release(ctx); \ } else if (__acquire == SPU_ATTR_ACQUIRE_SAVED) { \ spu_acquire_saved(ctx); \ - ret = __get(ctx); \ + *val = __get(ctx); \ spu_release_saved(ctx); \ } else \ - ret = __get(ctx); \ + *val = __get(ctx); \ \ - return ret; \ + return 0; \ } \ -DEFINE_SIMPLE_ATTRIBUTE(__name, __##__get, __set, __fmt); +DEFINE_SPUFS_SIMPLE_ATTRIBUTE(__name, __##__get, __set, __fmt); -static void spufs_signal1_type_set(void *data, u64 val) +static int spufs_signal1_type_set(void *data, u64 val) { struct spu_context *ctx = data; spu_acquire(ctx); ctx->ops->signal1_type_set(ctx, val); spu_release(ctx); + + return 0; } static u64 spufs_signal1_type_get(struct spu_context *ctx) @@ -1139,13 +1255,15 @@ DEFINE_SPUFS_ATTRIBUTE(spufs_signal1_type, spufs_signal1_type_get, spufs_signal1_type_set, "%llu", SPU_ATTR_ACQUIRE); -static void spufs_signal2_type_set(void *data, u64 val) +static int spufs_signal2_type_set(void *data, u64 val) { struct spu_context *ctx = data; spu_acquire(ctx); ctx->ops->signal2_type_set(ctx, val); spu_release(ctx); + + return 0; } static u64 spufs_signal2_type_get(struct spu_context *ctx) @@ -1625,12 +1743,14 @@ static const struct file_operations spufs_mfc_fops = { .mmap = spufs_mfc_mmap, }; -static void spufs_npc_set(void *data, u64 val) +static int spufs_npc_set(void *data, u64 val) { struct spu_context *ctx = data; spu_acquire(ctx); ctx->ops->npc_write(ctx, val); spu_release(ctx); + + return 0; } static u64 spufs_npc_get(struct spu_context *ctx) @@ -1640,13 +1760,15 @@ static u64 spufs_npc_get(struct spu_context *ctx) DEFINE_SPUFS_ATTRIBUTE(spufs_npc_ops, spufs_npc_get, spufs_npc_set, "0x%llx\n", SPU_ATTR_ACQUIRE); -static void spufs_decr_set(void *data, u64 val) +static int 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_saved(ctx); + + return 0; } static u64 spufs_decr_get(struct spu_context *ctx) @@ -1657,7 +1779,7 @@ static u64 spufs_decr_get(struct spu_context *ctx) DEFINE_SPUFS_ATTRIBUTE(spufs_decr_ops, spufs_decr_get, spufs_decr_set, "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED); -static void spufs_decr_status_set(void *data, u64 val) +static int spufs_decr_status_set(void *data, u64 val) { struct spu_context *ctx = data; spu_acquire_saved(ctx); @@ -1666,6 +1788,8 @@ static void spufs_decr_status_set(void *data, u64 val) else ctx->csa.priv2.mfc_control_RW &= ~MFC_CNTL_DECREMENTER_RUNNING; spu_release_saved(ctx); + + return 0; } static u64 spufs_decr_status_get(struct spu_context *ctx) @@ -1679,13 +1803,15 @@ DEFINE_SPUFS_ATTRIBUTE(spufs_decr_status_ops, spufs_decr_status_get, spufs_decr_status_set, "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED); -static void spufs_event_mask_set(void *data, u64 val) +static int 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_saved(ctx); + + return 0; } static u64 spufs_event_mask_get(struct spu_context *ctx) @@ -1710,13 +1836,15 @@ static u64 spufs_event_status_get(struct spu_context *ctx) DEFINE_SPUFS_ATTRIBUTE(spufs_event_status_ops, spufs_event_status_get, NULL, "0x%llx\n", SPU_ATTR_ACQUIRE_SAVED) -static void spufs_srr0_set(void *data, u64 val) +static int 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_saved(ctx); + + return 0; } static u64 spufs_srr0_get(struct spu_context *ctx) @@ -1747,10 +1875,12 @@ static u64 spufs_object_id_get(struct spu_context *ctx) return ctx->object_id; } -static void spufs_object_id_set(void *data, u64 id) +static int spufs_object_id_set(void *data, u64 id) { struct spu_context *ctx = data; ctx->object_id = id; + + return 0; } DEFINE_SPUFS_ATTRIBUTE(spufs_object_id_ops, spufs_object_id_get,