Only the device table BASERn needs to be handled differently as
compared to all other tables. So, adding a separate function for
easy code maintenance and improved code readability.

Signed-off-by: Shanker Donthineni <shank...@codeaurora.org>
---
 drivers/irqchip/irq-gic-v3-its.c | 49 +++++++++++++++++++++-------------------
 1 file changed, 26 insertions(+), 23 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 6392c82..4bd9381 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -836,6 +836,30 @@ static void its_write_baser(struct its_node *its, struct 
its_baser *baser,
        writeq_relaxed(val, its->base + GITS_BASER + (baser->idx << 3));
 }
 
+static void its_parse_baser_device(struct its_node *its, struct its_baser 
*baser,
+                                  u32 *order)
+{
+       u64 esz = GITS_BASER_ENTRY_SIZE(its_read_baser(its, baser));
+       u32 ids = its->device_ids;
+       u32 new_order = *order;
+
+       /*
+        * Allocate as many entries as required to fit the
+        * range of device IDs that the ITS can grok... The ID
+        * space being incredibly sparse, this results in a
+        * massive waste of memory.
+        */
+       new_order = max_t(u32, get_order(esz << ids), new_order);
+       if (new_order >= MAX_ORDER) {
+               new_order = MAX_ORDER - 1;
+               ids = ilog2(PAGE_ORDER_TO_SIZE(new_order) / esz);
+               pr_warn("ITS@%pa: Device Table too large, reduce ids %u->%u\n",
+                       &its->phys_base, its->device_ids, ids);
+       }
+
+       *order = new_order;
+}
+
 static void its_free_tables(struct its_node *its)
 {
        int i;
@@ -892,29 +916,8 @@ static int its_alloc_tables(const char *node_name, struct 
its_node *its)
                if (type == GITS_BASER_TYPE_NONE)
                        continue;
 
-               /*
-                * Allocate as many entries as required to fit the
-                * range of device IDs that the ITS can grok... The ID
-                * space being incredibly sparse, this results in a
-                * massive waste of memory.
-                *
-                * For other tables, only allocate a single page.
-                */
-               if (type == GITS_BASER_TYPE_DEVICE) {
-                       /*
-                        * 'order' was initialized earlier to the default page
-                        * granule of the the ITS.  We can't have an allocation
-                        * smaller than that.  If the requested allocation
-                        * is smaller, round up to the default page granule.
-                        */
-                       order = max(get_order((1UL << ids) * entry_size),
-                                   order);
-                       if (order >= MAX_ORDER) {
-                               order = MAX_ORDER - 1;
-                               pr_warn("%s: Device Table too large, reduce its 
page order to %u\n",
-                                       node_name, order);
-                       }
-               }
+               if (type == GITS_BASER_TYPE_DEVICE)
+                       its_parse_baser_device(its, baser, &order);
 
 retry_alloc_baser:
                alloc_pages = (PAGE_ORDER_TO_SIZE(order) / psz);
-- 
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc. 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, 
a Linux Foundation Collaborative Project

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