From fd7734d48a13ee3536930088dc37555cbf811f58 Mon Sep 17 00:00:00 2001
From: Philip Yang <Philip.Yang@amd.com>
Date: Mon, 25 Jul 2022 07:10:10 -0400
Subject: drm/amdkfd: Split giant svm range
Git-commit: 5640cb8921c9aff1270557482237e06af00c388b
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
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@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
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 041342fa2a14..c00c6dc1d23c 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1891,6 +1891,31 @@ void svm_range_set_max_pages(struct amdgpu_device *adev)
} while (cmpxchg(&max_svm_range_pages, max_pages, _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
@@ -1993,14 +2018,11 @@ 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;
@@ -2008,15 +2030,10 @@ 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)
--
2.38.1