[PATCH v2 3/3] drm/amdkfd: Split giant svm range
Philip Yang
Philip.Yang at amd.com
Mon Jul 25 17:19:43 UTC 2022
Giant svm range split to smaller ranges, align the range start address
to max svm range pages to improve MMU TLB usage.
Signed-off-by: Philip Yang <Philip.Yang at amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 49 +++++++++++++++++++---------
1 file changed, 33 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 098060147de6..6529a40fb508 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1889,6 +1889,31 @@ void svm_range_set_max_pages(struct amdgpu_device *adev)
WRITE_ONCE(max_svm_range_pages, max_pages);
}
+static int
+svm_range_split_new(struct svm_range_list *svms, uint64_t start, uint64_t last,
+ uint64_t max_pages, struct list_head *insert_list,
+ struct list_head *update_list)
+{
+ struct svm_range *prange;
+ uint64_t l;
+
+ pr_debug("max_svm_range_pages 0x%llx adding [0x%llx 0x%llx]\n",
+ max_pages, start, last);
+
+ while (last >= start) {
+ l = min(last, ALIGN_DOWN(start + max_pages, max_pages) - 1);
+
+ prange = svm_range_new(svms, start, l);
+ if (!prange)
+ return -ENOMEM;
+ list_add(&prange->list, insert_list);
+ list_add(&prange->update_list, update_list);
+
+ start = l + 1;
+ }
+ return 0;
+}
+
/**
* svm_range_add - add svm range and handle overlap
* @p: the range add to this process svms
@@ -1991,14 +2016,11 @@ svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size,
/* insert a new node if needed */
if (node->start > start) {
- prange = svm_range_new(svms, start, node->start - 1);
- if (!prange) {
- r = -ENOMEM;
+ r = svm_range_split_new(svms, start, node->start - 1,
+ READ_ONCE(max_svm_range_pages),
+ insert_list, update_list);
+ if (r)
goto out;
- }
-
- list_add(&prange->list, insert_list);
- list_add(&prange->update_list, update_list);
}
node = next;
@@ -2006,15 +2028,10 @@ svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size,
}
/* add a final range at the end if needed */
- if (start <= last) {
- prange = svm_range_new(svms, start, last);
- if (!prange) {
- r = -ENOMEM;
- goto out;
- }
- list_add(&prange->list, insert_list);
- list_add(&prange->update_list, update_list);
- }
+ if (start <= last)
+ r = svm_range_split_new(svms, start, last,
+ READ_ONCE(max_svm_range_pages),
+ insert_list, update_list);
out:
if (r)
--
2.35.1
More information about the amd-gfx
mailing list