Am 26.08.2017 um 09:19 schrieb Felix Kuehling: > Change-Id: I101a5ac8e0ebf0dbbe6dbd1f61cd8236d499c5b8 > Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com> Reviewed-by: Christian König <christian.koenig at amd.com> > --- > drivers/gpu/drm/radeon/radeon_kfd.c | 30 ++++++++++++++++++++++++++++++ > 1 file changed, 30 insertions(+) > > diff --git a/drivers/gpu/drm/radeon/radeon_kfd.c b/drivers/gpu/drm/radeon/radeon_kfd.c > index 81fb94b..acfe34e 100644 > --- a/drivers/gpu/drm/radeon/radeon_kfd.c > +++ b/drivers/gpu/drm/radeon/radeon_kfd.c > @@ -79,6 +79,9 @@ static uint64_t get_gpu_clock_counter(struct kgd_dev *kgd); > > static uint32_t get_max_engine_clock_in_mhz(struct kgd_dev *kgd); > > +static int alloc_pasid(unsigned int bits); > +static void free_pasid(unsigned int pasid); > + > static int create_process_vm(struct kgd_dev *kgd, void **vm, void **info); > static void destroy_process_vm(struct kgd_dev *kgd, void *vm); > > @@ -161,6 +164,8 @@ static const struct kfd2kgd_calls kfd2kgd = { > .get_local_mem_info = get_local_mem_info, > .get_gpu_clock_counter = get_gpu_clock_counter, > .get_max_engine_clock_in_mhz = get_max_engine_clock_in_mhz, > + .alloc_pasid = alloc_pasid, > + .free_pasid = free_pasid, > .create_process_vm = create_process_vm, > .destroy_process_vm = destroy_process_vm, > .get_process_page_dir = get_process_page_dir, > @@ -415,6 +420,31 @@ static uint32_t get_max_engine_clock_in_mhz(struct kgd_dev *kgd) > } > > /* > + * PASID manager > + */ > +static DEFINE_IDA(pasid_ida); > + > +int alloc_pasid(unsigned int bits) > +{ > + int pasid = -EINVAL; > + > + for (bits = min(bits, 31U); bits > 0; bits--) { > + pasid = ida_simple_get(&pasid_ida, > + 1U << (bits - 1), 1U << bits, > + GFP_KERNEL); > + if (pasid != -ENOSPC) > + break; > + } > + > + return pasid; > +} > + > +void free_pasid(unsigned int pasid) > +{ > + ida_simple_remove(&pasid_ida, pasid); > +} > + > +/* > * Creates a VM context for HSA process > */ > static int create_process_vm(struct kgd_dev *kgd, void **vm, void **info)