libhsakmt: Set CWSR SVM range MADV_DONTFORK

fork process copy-on-write MMU nitifier on CWSR range will evict user
queues, and then update GPU mapping and resume queues, use MADV_DONTFORK
to avoid COW MMU notifier callback on CWSR SVM range.

Use mmap to alloc SVM range for CWSR because posix_memalign don't alloc
new range in child process, this fails to register svm range as range is
invalid address in forked child process.

Change-Id: Ibaea56a691dd6f577ed2e1f2d43f4a3500b8316f
Signed-off-by: Philip Yang <Philip.Yang@amd.com>

src/fmm.h

@@ -90,4 +90,7 @@ HSAKMT_STATUS fmm_map_to_gpu_nodes(void *address, uint64_t size,
 		uint32_t *nodes_to_map, uint64_t num_of_nodes, uint64_t *gpuvm_address);
 
 int open_drm_render_device(int minor);
+void *mmap_allocate_aligned(int prot, int flags, uint64_t size, uint64_t align,
+			    uint64_t guard_size, void *aper_base, void *aper_limit);
+
 #endif /* FMM_H_ */