accel/habanalabs: expose dram reserved size by kmd

We expose this in order for user applications to know how much dram
is reserved for internal use.
Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/accel/habanalabs/common/habanalabs_ioctl.c

@@ -109,6 +109,7 @@ static int hw_ip_info(struct hl_device *hdev, struct hl_info_args *args)
 	hw_ip.security_enabled = prop->fw_security_enabled;
 	hw_ip.revision_id = hdev->pdev->revision;
 	hw_ip.engine_core_interrupt_reg_addr = prop->engine_core_interrupt_reg_addr;
+	hw_ip.reserved_dram_size = dram_kmd_size;
 
 	return copy_to_user(out, &hw_ip,
 		min((size_t) size, sizeof(hw_ip))) ? -EFAULT : 0;

include/uapi/drm/habanalabs_accel.h

@@ -888,6 +888,7 @@ enum hl_server_type {
  * @tpc_interrupt_id: interrupt id for TPC to use in order to raise events towards the host.
  * @engine_core_interrupt_reg_addr: interrupt register address for engine core to use
  *                                  in order to raise events toward FW.
+ * @reserved_dram_size: DRAM size reserved for driver and firmware.
  */
 struct hl_info_hw_ip_info {
 	__u64 sram_base_address;
@@ -928,6 +929,7 @@ struct hl_info_hw_ip_info {
 	__u32 reserved8;
 	__u32 reserved9;
 	__u64 engine_core_interrupt_reg_addr;
+	__u64 reserved_dram_size;
 };
 
 struct hl_info_dram_usage {