fpga: mgr: add compat_id support

This patch introduces compat_id support to fpga manager, it adds
a fpga_compat_id pointer to fpga manager data structure to allow
fpga manager drivers to save the compatibility id. This compat_id
could be used for compatibility checking before doing partial
reconfiguration to associated fpga regions.

Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
index e249b7250345..8942e61f0028 100644
--- a/include/linux/fpga/fpga-mgr.h
+++ b/include/linux/fpga/fpga-mgr.h
@@ -136,11 +136,23 @@ struct fpga_manager_ops {
 #define FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR       BIT(4)
 
 /**
+ * struct fpga_compat_id - id for compatibility check
+ *
+ * @id_h: high 64bit of the compat_id
+ * @id_l: low 64bit of the compat_id
+ */
+struct fpga_compat_id {
+        u64 id_h;
+        u64 id_l;
+};
+
+/**
  * struct fpga_manager - fpga manager structure
  * @name: name of low level fpga manager
  * @dev: fpga manager device
  * @ref_mutex: only allows one reference to fpga manager
  * @state: state of fpga manager
+ * @compat_id: FPGA manager id for compatibility check.
  * @mops: pointer to struct of fpga manager ops
  * @priv: low level driver private date
  */
@@ -149,6 +161,7 @@ struct fpga_manager {
         struct device dev;
         struct mutex ref_mutex;
         enum fpga_mgr_states state;
+        struct fpga_compat_id *compat_id;
         const struct fpga_manager_ops *mops;
         void *priv;
 };