[POWERPC] spufs: Synchronize pte invalidation vs ps close

Make sure the mapping_lock also protects access to the various address_space
pointers used for tearing down the ptes on a spu context switch.

Because unmap_mapping_range can sleep we need to turn mapping_lock from
a spinlock into a sleeping mutex.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 32 insertions, 30 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/context.c b/arch/powerpc/platforms/cell/spufs/context.c
index 8654749e317..7c51cb54bca 100644
--- a/arch/powerpc/platforms/cell/spufs/context.c
+++ b/arch/powerpc/platforms/cell/spufs/context.c
@@ -39,7 +39,7 @@ struct spu_context *alloc_spu_context(struct spu_gang *gang)
         if (spu_init_csa(&ctx->csa))
                 goto out_free;
         spin_lock_init(&ctx->mmio_lock);
-        spin_lock_init(&ctx->mapping_lock);
+        mutex_init(&ctx->mapping_lock);
         kref_init(&ctx->kref);
         mutex_init(&ctx->state_mutex);
         mutex_init(&ctx->run_mutex);
@@ -103,6 +103,7 @@ void spu_forget(struct spu_context *ctx)
 
 void spu_unmap_mappings(struct spu_context *ctx)
 {
+        mutex_lock(&ctx->mapping_lock);
         if (ctx->local_store)
                 unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1);
         if (ctx->mfc)
@@ -117,6 +118,7 @@ void spu_unmap_mappings(struct spu_context *ctx)
                 unmap_mapping_range(ctx->mss, 0, 0x1000, 1);
         if (ctx->psmap)
                 unmap_mapping_range(ctx->psmap, 0, 0x20000, 1);
+        mutex_unlock(&ctx->mapping_lock);
 }
 
 /**
diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index 89a50110a3c..b1e7e2f8a2e 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -45,11 +45,11 @@ spufs_mem_open(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         file->private_data = ctx;
         if (!i->i_openers++)
                 ctx->local_store = inode->i_mapping;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return 0;
 }
 
@@ -59,10 +59,10 @@ spufs_mem_release(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         if (!--i->i_openers)
                 ctx->local_store = NULL;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return 0;
 }
 
@@ -310,11 +310,11 @@ static int spufs_cntl_open(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         file->private_data = ctx;
         if (!i->i_openers++)
                 ctx->cntl = inode->i_mapping;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return simple_attr_open(inode, file, spufs_cntl_get,
                                         spufs_cntl_set, "0x%08lx");
 }
@@ -327,10 +327,10 @@ spufs_cntl_release(struct inode *inode, struct file *file)
 
         simple_attr_close(inode, file);
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         if (!--i->i_openers)
                 ctx->cntl = NULL;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return 0;
 }
 
@@ -813,11 +813,11 @@ static int spufs_signal1_open(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         file->private_data = ctx;
         if (!i->i_openers++)
                 ctx->signal1 = inode->i_mapping;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return nonseekable_open(inode, file);
 }
 
@@ -827,10 +827,10 @@ spufs_signal1_release(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         if (!--i->i_openers)
                 ctx->signal1 = NULL;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return 0;
 }
 
@@ -937,11 +937,11 @@ static int spufs_signal2_open(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         file->private_data = ctx;
         if (!i->i_openers++)
                 ctx->signal2 = inode->i_mapping;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return nonseekable_open(inode, file);
 }
 
@@ -951,10 +951,10 @@ spufs_signal2_release(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         if (!--i->i_openers)
                 ctx->signal2 = NULL;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return 0;
 }
 
@@ -1155,10 +1155,10 @@ static int spufs_mss_open(struct inode *inode, struct file *file)
 
         file->private_data = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         if (!i->i_openers++)
                 ctx->mss = inode->i_mapping;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return nonseekable_open(inode, file);
 }
 
@@ -1168,10 +1168,10 @@ spufs_mss_release(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         if (!--i->i_openers)
                 ctx->mss = NULL;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return 0;
 }
 
@@ -1212,11 +1212,11 @@ static int spufs_psmap_open(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         file->private_data = i->i_ctx;
         if (!i->i_openers++)
                 ctx->psmap = inode->i_mapping;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return nonseekable_open(inode, file);
 }
 
@@ -1226,10 +1226,10 @@ spufs_psmap_release(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         if (!--i->i_openers)
                 ctx->psmap = NULL;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return 0;
 }
 
@@ -1282,11 +1282,11 @@ static int spufs_mfc_open(struct inode *inode, struct file *file)
         if (atomic_read(&inode->i_count) != 1)
                 return -EBUSY;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         file->private_data = ctx;
         if (!i->i_openers++)
                 ctx->mfc = inode->i_mapping;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return nonseekable_open(inode, file);
 }
 
@@ -1296,10 +1296,10 @@ spufs_mfc_release(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         struct spu_context *ctx = i->i_ctx;
 
-        spin_lock(&ctx->mapping_lock);
+        mutex_lock(&ctx->mapping_lock);
         if (!--i->i_openers)
                 ctx->mfc = NULL;
-        spin_unlock(&ctx->mapping_lock);
+        mutex_unlock(&ctx->mapping_lock);
         return 0;
 }
 
diff --git a/arch/powerpc/platforms/cell/spufs/spufs.h b/arch/powerpc/platforms/cell/spufs/spufs.h
index 0a947fd7de5..47617e8014a 100644
--- a/arch/powerpc/platforms/cell/spufs/spufs.h
+++ b/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -55,7 +55,7 @@ struct spu_context {
         struct address_space *signal2;     /* 'signal2' area mappings. */
         struct address_space *mss;         /* 'mss' area mappings. */
         struct address_space *psmap;       /* 'psmap' area mappings. */
-        spinlock_t mapping_lock;
+        struct mutex mapping_lock;
         u64 object_id;             /* user space pointer for oprofile */
 
         enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;