Am 26.08.2017 um 09:19 schrieb Felix Kuehling:
Change-Id: I101a5ac8e0ebf0dbbe6dbd1f61cd8236d499c5b8
Signed-off-by: Felix Kuehling <[email protected]>
Reviewed-by: Christian König <[email protected]>
---
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)
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