[PATCH v3 03/10] powerpc/pseries/vas: Save LPID in pseries_vas_window struct

[Haren Myneni]

The kernel sets the VAS window with partition PID when is opened in
the hypervisor. During DLPAR operation, windows can be closed and
reopened in the hypervisor when the credit is available. So saves
this PID in pseries_vas_window struct when the window is opened
initially and reuse it later during DLPAR operation.

Signed-off-by: Haren Myneni <haren at linux.ibm.com>
---
 arch/powerpc/platforms/pseries/vas.c | 7 ++++---
 arch/powerpc/platforms/pseries/vas.h | 1 +
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/vas.c
b/arch/powerpc/platforms/pseries/vas.c
index d2c8292bfb33..2ef56157634f 100644
--- a/arch/powerpc/platforms/pseries/vas.c
+++ b/arch/powerpc/platforms/pseries/vas.c
@@ -107,7 +107,6 @@ static int h_deallocate_vas_window(u64 winid)
 static int h_modify_vas_window(struct pseries_vas_window *win)
 {
 	long rc;
-	u32 lpid = mfspr(SPRN_PID);
 
 	/*
 	 * AMR value is not supported in Linux VAS implementation.
@@ -115,7 +114,7 @@ static int h_modify_vas_window(struct
pseries_vas_window *win)
 	 */
 	do {
 		rc = plpar_hcall_norets(H_MODIFY_VAS_WINDOW,
-					win->vas_win.winid, lpid, 0,
+					win->vas_win.winid, win->lpid,
0,
 					VAS_MOD_WIN_FLAGS, 0);
 
 		rc = hcall_return_busy_check(rc);
@@ -125,7 +124,7 @@ static int h_modify_vas_window(struct
pseries_vas_window *win)
 		return 0;
 
 	pr_err("H_MODIFY_VAS_WINDOW error: %ld, winid %u lpid %u\n",
-			rc, win->vas_win.winid, lpid);
+			rc, win->vas_win.winid, win->lpid);
 	return -EIO;
 }
 
@@ -338,6 +337,8 @@ static struct vas_window *vas_allocate_window(int
vas_id, u64 flags,
 		}
 	}
 
+	txwin->lpid = mfspr(SPRN_PID);
+
 	/*
 	 * Allocate / Deallocate window hcalls and setup / free IRQs
 	 * have to be protected with mutex.
diff --git a/arch/powerpc/platforms/pseries/vas.h
b/arch/powerpc/platforms/pseries/vas.h
index fa7ce74f1e49..0538760d13be 100644
--- a/arch/powerpc/platforms/pseries/vas.h
+++ b/arch/powerpc/platforms/pseries/vas.h
@@ -115,6 +115,7 @@ struct pseries_vas_window {
 	u64 domain[6];		/* Associativity domain Ids */
 				/* this window is allocated */
 	u64 util;
+	u32 lpid;
 
 	/* List of windows opened which is used for LPM */
 	struct list_head win_list;
-- 
2.27.0