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dma-buf: system_heap: Allow specifying maximum allocation order

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system_heap.max_order=<uint>

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
This commit is contained in:
Tvrtko Ursulin
2024-07-17 09:33:21 +01:00
committed by Dom Cobley
parent 190d9ce168
commit ca56df0d9d
1 changed files with 11 additions and 2 deletions
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13
drivers/dma-buf/heaps/system_heap.c
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@@ -49,9 +49,15 @@ static gfp_t order_flags[] = {HIGH_ORDER_GFP, HIGH_ORDER_GFP, LOW_ORDER_GFP};
* of order 0 pages can significantly improve the performance of many IOMMUs
* by reducing TLB pressure and time spent updating page tables.
*/
static const unsigned int orders[] = {8, 4, 0};
#define MAX_ORDERS_VALUE 8
static const unsigned int orders[] = {MAX_ORDERS_VALUE, 4, 0};
#define NUM_ORDERS ARRAY_SIZE(orders)
static unsigned int module_max_order = MAX_ORDERS_VALUE;
module_param_named(max_order, module_max_order, uint, 0400);
MODULE_PARM_DESC(max_order, "Maximum allocation order override.");
static int dup_sg_table(struct sg_table *from, struct sg_table *to)
{
struct scatterlist *sg, *new_sg;
@@ -328,7 +334,7 @@ static struct dma_buf *system_heap_allocate(struct dma_heap *heap,
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;
@@ -423,6 +429,9 @@ static int __init 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);