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Commit f2b23b8b authored by Patrick Daly's avatar Patrick Daly
Browse files

ion: Add hibernation support for secure cma heap 



Verify there are no outstanding buffers to prevent loss of state
when resuming from hibernation.

Change-Id: Ibcd768d120ebdc7be51df90b515c7b28b7148a6f
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent c6eed32e

drivers/staging/android/ion/ion_cma_heap.c

+17 −0
Original line number Diff line number Diff line
@@ -264,12 +264,29 @@ static int ion_secure_cma_map_user(struct ion_heap *mapper, 
	return ion_heap_map_user(mapper, buffer, vma);

}



static int ion_secure_cma_pm_freeze(struct ion_heap *heap)

{

	long sz;



	sz = atomic_long_read(&heap->total_allocated);

	if (sz) {

		pr_err("%s: %lx bytes won't be saved across hibernation. Aborting.",

		       __func__, sz);

		return -EINVAL;

	}



	return 0;

}



static struct ion_heap_ops ion_secure_cma_ops = {

	.allocate = ion_secure_cma_allocate,

	.free = ion_secure_cma_free,

	.map_user = ion_secure_cma_map_user,

	.map_kernel = ion_secure_cma_map_kernel,

	.unmap_kernel = ion_heap_unmap_kernel,

	.pm = {

		.freeze = ion_secure_cma_pm_freeze,

	}

};



struct ion_heap *ion_cma_secure_heap_create(struct ion_platform_heap *data)