diff options
| -rw-r--r-- | drivers/misc/cxl/api.c | 33 | ||||
| -rw-r--r-- | drivers/misc/cxl/context.c | 2 | ||||
| -rw-r--r-- | drivers/misc/cxl/cxl.h | 1 |
3 files changed, 33 insertions, 3 deletions
diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c index 005adc7d33a2..8af12c884b04 100644 --- a/drivers/misc/cxl/api.c +++ b/drivers/misc/cxl/api.c @@ -12,11 +12,13 @@ #include <linux/anon_inodes.h> #include <linux/file.h> #include <misc/cxl.h> +#include <linux/fs.h> #include "cxl.h" struct cxl_context *cxl_dev_context_init(struct pci_dev *dev) { + struct address_space *mapping; struct cxl_afu *afu; struct cxl_context *ctx; int rc; @@ -30,14 +32,32 @@ struct cxl_context *cxl_dev_context_init(struct pci_dev *dev) goto err_dev; } + ctx->kernelapi = true; + + /* + * Make our own address space since we won't have one from the + * filesystem like the user api has, and even if we do associate a file + * with this context we don't want to use the global anonymous inode's + * address space as that can invalidate unrelated users: + */ + mapping = kmalloc(sizeof(struct address_space), GFP_KERNEL); + if (!mapping) { + rc = -ENOMEM; + goto err_ctx; + } + address_space_init_once(mapping); + /* Make it a slave context. We can promote it later? */ - rc = cxl_context_init(ctx, afu, false, NULL); + rc = cxl_context_init(ctx, afu, false, mapping); if (rc) - goto err_ctx; + goto err_mapping; + cxl_assign_psn_space(ctx); return ctx; +err_mapping: + kfree(mapping); err_ctx: kfree(ctx); err_dev: @@ -260,9 +280,16 @@ struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops, file = anon_inode_getfile("cxl", fops, ctx, flags); if (IS_ERR(file)) - put_unused_fd(fdtmp); + goto err_fd; + + file->f_mapping = ctx->mapping; + *fd = fdtmp; return file; + +err_fd: + put_unused_fd(fdtmp); + return NULL; } EXPORT_SYMBOL_GPL(cxl_get_fd); diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c index 941fda04aa9a..e762f85ee233 100644 --- a/drivers/misc/cxl/context.c +++ b/drivers/misc/cxl/context.c @@ -272,6 +272,8 @@ static void reclaim_ctx(struct rcu_head *rcu) if (ctx->ff_page) __free_page(ctx->ff_page); ctx->sstp = NULL; + if (ctx->kernelapi) + kfree(ctx->mapping); kfree(ctx); } diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h index e7af256f60c5..d6566c60bcb0 100644 --- a/drivers/misc/cxl/cxl.h +++ b/drivers/misc/cxl/cxl.h @@ -420,6 +420,7 @@ struct cxl_context { struct mutex mapping_lock; struct page *ff_page; bool mmio_err_ff; + bool kernelapi; spinlock_t sste_lock; /* Protects segment table entries */ struct cxl_sste *sstp; |