openwrt/target/linux/bcm27xx/patches-6.6/950-1341-dma-buf-system_heap-Allow-specifying-maximum-allocat.patch

From 56fda5adce0c9b4dc8ff2c7be9a704599e685001 Mon Sep 17 00:00:00 2001
From: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Date: Wed, 17 Jul 2024 09:33:21 +0100
Subject: [PATCH 1341/1350] dma-buf: system_heap: Allow specifying maximum
 allocation order

system_heap.max_order=<uint>

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
---
 drivers/dma-buf/heaps/system_heap.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/dma-buf/heaps/system_heap.c
+++ b/drivers/dma-buf/heaps/system_heap.c
@@ -54,6 +54,11 @@ static gfp_t order_flags[] = {HIGH_ORDER
 static const unsigned int orders[] = {8, 4, 0};
 #define NUM_ORDERS ARRAY_SIZE(orders)
 
+static unsigned int module_max_order = orders[0];
+
+module_param_named(max_order, module_max_order, uint, 0400);
+MODULE_PARM_DESC(max_order, "Maximum allocation order override.");
+
 static struct sg_table *dup_sg_table(struct sg_table *table)
 {
 	struct sg_table *new_table;
@@ -339,7 +344,7 @@ static struct dma_buf *system_heap_alloc
 	struct system_heap_buffer *buffer;
 	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 	unsigned long size_remaining = len;
-	unsigned int max_order = orders[0];
+	unsigned int max_order = module_max_order;
 	struct dma_buf *dmabuf;
 	struct sg_table *table;
 	struct scatterlist *sg;
@@ -433,6 +438,9 @@ static int system_heap_create(void)
 	if (IS_ERR(sys_heap))
 		return PTR_ERR(sys_heap);
 
+	if (module_max_order > orders[0])
+		module_max_order = orders[0];
+
 	return 0;
 }
 module_init(system_heap_create);