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path: root/drivers/misc/cxl/file.c
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Diffstat (limited to 'drivers/misc/cxl/file.c')
-rw-r--r--drivers/misc/cxl/file.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c
index 4bfad9f6dc9f..76c0b0ca9388 100644
--- a/drivers/misc/cxl/file.c
+++ b/drivers/misc/cxl/file.c
@@ -19,6 +19,7 @@
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/sched/mm.h>
+#include <linux/mmu_context.h>
#include <asm/cputable.h>
#include <asm/current.h>
#include <asm/copro.h>
@@ -220,9 +221,12 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
/* ensure this mm_struct can't be freed */
cxl_context_mm_count_get(ctx);
- /* decrement the use count */
- if (ctx->mm)
+ if (ctx->mm) {
+ /* decrement the use count from above */
mmput(ctx->mm);
+ /* make TLBIs for this context global */
+ mm_context_add_copro(ctx->mm);
+ }
/*
* Increment driver use count. Enables global TLBIs for hash
@@ -230,6 +234,20 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
*/
cxl_ctx_get();
+ /*
+ * A barrier is needed to make sure all TLBIs are global
+ * before we attach and the context starts being used by the
+ * adapter.
+ *
+ * Needed after mm_context_add_copro() for radix and
+ * cxl_ctx_get() for hash/p8.
+ *
+ * The barrier should really be mb(), since it involves a
+ * device. However, it's only useful when we have local
+ * vs. global TLBIs, i.e SMP=y. So keep smp_mb().
+ */
+ smp_mb();
+
trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr);
if ((rc = cxl_ops->attach_process(ctx, false, work.work_element_descriptor,
@@ -240,6 +258,8 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
ctx->pid = NULL;
cxl_ctx_put();
cxl_context_mm_count_put(ctx);
+ if (ctx->mm)
+ mm_context_remove_copro(ctx->mm);
goto out;
}