Define helpers to allocate/free VAS window objects. These will
be used in follow-on patches when opening/closing windows.
Signed-off-by: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com>
---
drivers/misc/vas/vas-window.c | 72 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 71 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/vas/vas-window.c b/drivers/misc/vas/vas-window.c
index c2e6b4e..3ea698a 100644
--- a/drivers/misc/vas/vas-window.c
+++ b/drivers/misc/vas/vas-window.c
@@ -454,8 +454,78 @@ int init_winctx_regs(struct vas_window *window, struct
vas_winctx *winctx)
return 0;
}
-/* stub for now */
+DEFINE_SPINLOCK(vas_ida_lock);
+
+void vas_release_window_id(struct ida *ida, int winid)
+{
+ spin_lock(&vas_ida_lock);
+ ida_remove(ida, winid);
+ spin_unlock(&vas_ida_lock);
+}
+
+int vas_assign_window_id(struct ida *ida)
+{
+ int rc, winid;
+
+ rc = ida_pre_get(ida, GFP_KERNEL);
+ if (!rc)
+ return -EAGAIN;
+
+ spin_lock(&vas_ida_lock);
+ rc = ida_get_new_above(ida, 1, &winid);
+ spin_unlock(&vas_ida_lock);
+
+ if (rc)
+ return rc;
+
+ if (winid > VAS_MAX_WINDOWS_PER_CHIP) {
+ pr_err("VAS: Too many (%d) open windows\n", winid);
+ vas_release_window_id(ida, winid);
+ return -EAGAIN;
+ }
+
+ return winid;
+}
+
+static void vas_window_free(struct vas_window *window)
+{
+ unmap_wc_mmio_bars(window);
+ kfree(window->paste_addr_name);
+ kfree(window);
+}
+
+static struct vas_window *vas_window_alloc(struct vas_instance *vinst, int id)
+{
+ struct vas_window *window;
+
+ window = kzalloc(sizeof(*window), GFP_KERNEL);
+ if (!window)
+ return NULL;
+
+ window->vinst = vinst;
+ window->winid = id;
+
+ if (map_wc_mmio_bars(window))
+ goto out_free;
+
+ return window;
+
+out_free:
+ kfree(window);
+ return NULL;
+}
+
int vas_window_reset(struct vas_instance *vinst, int winid)
{
+ struct vas_window *window;
+
+ window = vas_window_alloc(vinst, winid);
+ if (!window)
+ return -ENOMEM;
+
+ reset_window_regs(window);
+
+ vas_window_free(window);
+
return 0;
}
--
2.7.4
