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staging: android: ion: system-heap adjust orders if swiotlb limit

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This patch is useful for board with totalram size larger than 4GB.

Since swiotlb has memory size limitation, this will calculate the
maximum size locally, as a workaround to fix the orders[0].

With this patch:
[    3.921612] orders[0] = 6
[    3.921647] orders[1] = 4
[    3.921715] orders[2] = 0

Change-Id: I9286f6ea53f679816c9afd378a6cfe620ef1b53e
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
This commit is contained in:
Jianqun Xu
2021-02-04 15:21:59 +08:00
committed by Tao Huang
parent 7f51aa1c40
commit af3b0010cd
1 changed files with 28 additions and 1 deletions
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29
drivers/staging/android/ion/ion_system_heap.c
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@@ -13,6 +13,7 @@
#include <linux/scatterlist.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/swiotlb.h>
#include <linux/vmalloc.h>
#include "ion.h"
@@ -21,7 +22,7 @@
static gfp_t high_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN |
__GFP_NORETRY) & ~__GFP_RECLAIM;
static gfp_t low_order_gfp_flags = GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN;
static const unsigned int orders[] = {8, 4, 0};
static unsigned int orders[] = {8, 4, 0};
static int order_to_index(unsigned int order)
{
@@ -347,6 +348,32 @@ int ion_system_heap_create(void)
{
struct ion_heap *heap;
#ifdef CONFIG_SWIOTLB
/*
* Since swiotlb has memory size limitation, this will calculate
* the maximum size locally.
*
* Once swiotlb_max_segment() return not '0', means that the totalram size
* is larger than 4GiB and swiotlb is not force mode, in this case, system
* heap should limit largest allocation.
*
* FIX: fix the orders[] as a workaround.
*/
if (swiotlb_max_segment()) {
unsigned int max_size = (1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE;
int max_order = MAX_ORDER;
int i;
max_size = max_t(unsigned int, max_size, PAGE_SIZE) >> PAGE_SHIFT;
max_order = min(max_order, ilog2(max_size));
for (i = 0; i < NUM_ORDERS; i++) {
if (max_order < orders[i])
orders[i] = max_order;
pr_info("orders[%d] = %u\n", i, orders[i]);
}
}
#endif
heap = __ion_system_heap_create();
if (IS_ERR(heap))
return PTR_ERR(heap);