Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
drivers/gpu/drm/radeon/radeon_kfd.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_kfd.c b/drivers/gpu/drm/radeon/radeon_kfd.c
index f6578c9..a2ac8ac 100644
--- a/drivers/gpu/drm/radeon/radeon_kfd.c
+++ b/drivers/gpu/drm/radeon/radeon_kfd.c
@@ -58,6 +58,10 @@ static uint64_t get_vmem_size(struct kgd_dev *kgd);
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 uint16_t get_fw_version(struct kgd_dev *kgd, enum kgd_engine_type type);
/*
@@ -112,6 +116,8 @@ static const struct kfd2kgd_calls kfd2kgd = {
.get_vmem_size = get_vmem_size,
.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,
.program_sh_mem_settings = kgd_program_sh_mem_settings,
.set_pasid_vmid_mapping = kgd_set_pasid_vmid_mapping,
.init_pipeline = kgd_init_pipeline,
@@ -341,6 +347,31 @@ static uint32_t get_max_engine_clock_in_mhz(struct kgd_dev *kgd)
return rdev->pm.dpm.dyn_state.max_clock_voltage_on_ac.sclk / 100;
}
+/*
+ * 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);
+}
+
static inline struct radeon_device *get_radeon_device(struct kgd_dev *kgd)
{
return (struct radeon_device *)kgd;
--
2.7.4
