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-rw-r--r--drivers/misc/cxl/context.c14
-rw-r--r--drivers/misc/cxl/cxl.h4
-rw-r--r--drivers/misc/cxl/file.c4
-rw-r--r--include/uapi/misc/cxl.h4
4 files changed, 23 insertions, 3 deletions
diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
index 615842115848..941fda04aa9a 100644
--- a/drivers/misc/cxl/context.c
+++ b/drivers/misc/cxl/context.c
@@ -126,6 +126,18 @@ static int cxl_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
if (ctx->status != STARTED) {
mutex_unlock(&ctx->status_mutex);
pr_devel("%s: Context not started, failing problem state access\n", __func__);
+ if (ctx->mmio_err_ff) {
+ if (!ctx->ff_page) {
+ ctx->ff_page = alloc_page(GFP_USER);
+ if (!ctx->ff_page)
+ return VM_FAULT_OOM;
+ memset(page_address(ctx->ff_page), 0xff, PAGE_SIZE);
+ }
+ get_page(ctx->ff_page);
+ vmf->page = ctx->ff_page;
+ vma->vm_page_prot = pgprot_cached(vma->vm_page_prot);
+ return 0;
+ }
return VM_FAULT_SIGBUS;
}
@@ -257,6 +269,8 @@ static void reclaim_ctx(struct rcu_head *rcu)
struct cxl_context *ctx = container_of(rcu, struct cxl_context, rcu);
free_page((u64)ctx->sstp);
+ if (ctx->ff_page)
+ __free_page(ctx->ff_page);
ctx->sstp = NULL;
kfree(ctx);
diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index 6f5386653dae..e7af256f60c5 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -34,7 +34,7 @@ extern uint cxl_verbose;
* Bump version each time a user API change is made, whether it is
* backwards compatible ot not.
*/
-#define CXL_API_VERSION 1
+#define CXL_API_VERSION 2
#define CXL_API_VERSION_COMPATIBLE 1
/*
@@ -418,6 +418,8 @@ struct cxl_context {
/* Used to unmap any mmaps when force detaching */
struct address_space *mapping;
struct mutex mapping_lock;
+ struct page *ff_page;
+ bool mmio_err_ff;
spinlock_t sste_lock; /* Protects segment table entries */
struct cxl_sste *sstp;
diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c
index 57bdb473749f..a30bf285b5bd 100644
--- a/drivers/misc/cxl/file.c
+++ b/drivers/misc/cxl/file.c
@@ -184,6 +184,8 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
if (work.flags & CXL_START_WORK_AMR)
amr = work.amr & mfspr(SPRN_UAMOR);
+ ctx->mmio_err_ff = !!(work.flags & CXL_START_WORK_ERR_FF);
+
/*
* We grab the PID here and not in the file open to allow for the case
* where a process (master, some daemon, etc) has opened the chardev on
@@ -538,7 +540,7 @@ int __init cxl_file_init(void)
* If these change we really need to update API. Either change some
* flags or update API version number CXL_API_VERSION.
*/
- BUILD_BUG_ON(CXL_API_VERSION != 1);
+ BUILD_BUG_ON(CXL_API_VERSION != 2);
BUILD_BUG_ON(sizeof(struct cxl_ioctl_start_work) != 64);
BUILD_BUG_ON(sizeof(struct cxl_event_header) != 8);
BUILD_BUG_ON(sizeof(struct cxl_event_afu_interrupt) != 8);
diff --git a/include/uapi/misc/cxl.h b/include/uapi/misc/cxl.h
index 99a8ca15fe64..1e889aa8a36e 100644
--- a/include/uapi/misc/cxl.h
+++ b/include/uapi/misc/cxl.h
@@ -29,8 +29,10 @@ struct cxl_ioctl_start_work {
#define CXL_START_WORK_AMR 0x0000000000000001ULL
#define CXL_START_WORK_NUM_IRQS 0x0000000000000002ULL
+#define CXL_START_WORK_ERR_FF 0x0000000000000004ULL
#define CXL_START_WORK_ALL (CXL_START_WORK_AMR |\
- CXL_START_WORK_NUM_IRQS)
+ CXL_START_WORK_NUM_IRQS |\
+ CXL_START_WORK_ERR_FF)
/* Possible modes that an afu can be in */

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