This is just a resend of
https://lore.kernel.org/stable/20230318173943.3188213-1-qyousef@layalina.io/
Changes in v2:
* Fix compilation error against patch 7 due to misiplace #endif to
protect against CONFIG_SMP which doesn't contain the newly added
field to struct rq.
Commit 2ff401441711 ("sched/uclamp: Fix relationship between uclamp and
migration margin") was cherry-picked into 5.10 kernels but missed the rest of
the series.
This ports the remainder of the fixes.
Based on 5.10.172.
NOTE:
a2e90611b9f4 ("sched/fair: Remove capacity inversion detection") is not
necessary to backport because it has a dependency on e5ed0550c04c ("sched/fair:
unlink misfit task from cpu overutilized") which is nice to have but not
strictly required. It improves the search for best CPU under adverse thermal
pressure to try harder. And the new search effectively replaces the capacity
inversion detection, so it is removed afterwards.
Build tested on (cross compile when necessary; x86_64 otherwise):
1. default ubuntu config which has uclamp + smp
2. default ubuntu config without uclamp + smp
3. default ubunto config without smp (which automatically disables
uclamp)
4. reported riscv-allnoconfig, mips-randconfig, x86_64-randocnfigs
Tested on 5.10 Android GKI kernel and android device (with slight modifications
due to other conflicts on there).
Qais Yousef (10):
sched/uclamp: Make task_fits_capacity() use util_fits_cpu()
sched/uclamp: Fix fits_capacity() check in feec()
sched/uclamp: Make select_idle_capacity() use util_fits_cpu()
sched/uclamp: Make asym_fits_capacity() use util_fits_cpu()
sched/uclamp: Make cpu_overutilized() use util_fits_cpu()
sched/uclamp: Cater for uclamp in find_energy_efficient_cpu()'s early
exit condition
sched/fair: Detect capacity inversion
sched/fair: Consider capacity inversion in util_fits_cpu()
sched/uclamp: Fix a uninitialized variable warnings
sched/fair: Fixes for capacity inversion detection
kernel/sched/core.c | 10 +--
kernel/sched/fair.c | 183 ++++++++++++++++++++++++++++++++++---------
kernel/sched/sched.h | 70 ++++++++++++++++-
3 files changed, 217 insertions(+), 46 deletions(-)
--
2.25.1
The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x f4e9e0e69468583c2c6d9d5c7bfc975e292bf188
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2023042254-platinum-service-2032@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..
Possible dependencies:
f4e9e0e69468 ("mm/mempolicy: fix use-after-free of VMA iterator")
9760ebffbf55 ("mm: switch vma_merge(), split_vma(), and __split_vma to vma iterator")
47d9644de92c ("nommu: convert nommu to using the vma iterator")
a27a11f92fe2 ("mm/mremap: use vmi version of vma_merge()")
076f16bf7698 ("mmap: use vmi version of vma_merge()")
0c0c5bffd0a2 ("mmap: pass through vmi iterator to __split_vma()")
178e22ac2078 ("madvise: use vmi iterator for __split_vma() and vma_merge()")
f10c2abcdac4 ("mempolicy: convert to vma iterator")
37598f5a9d8b ("mlock: convert mlock to vma iterator")
2286a6914c77 ("mm: change mprotect_fixup to vma iterator")
11a9b90274f6 ("userfaultfd: use vma iterator")
f2ebfe43ba6c ("mm: add temporary vma iterator versions of vma_merge(), split_vma(), and __split_vma()")
183654ce26a5 ("mmap: change do_mas_munmap and do_mas_aligned_munmap() to use vma iterator")
0378c0a0e9e4 ("mm/mmap: remove preallocation from do_mas_align_munmap()")
92fed82047d7 ("mm/mmap: convert brk to use vma iterator")
baabcfc93d3b ("mm/mmap: fix typo in comment")
c5d5546ea065 ("maple_tree: remove the parameter entry of mas_preallocate")
5ab0fc155dc0 ("Sync mm-stable with mm-hotfixes-stable to pick up dependent patches")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From f4e9e0e69468583c2c6d9d5c7bfc975e292bf188 Mon Sep 17 00:00:00 2001
From: "Liam R. Howlett" <Liam.Howlett(a)oracle.com>
Date: Mon, 10 Apr 2023 11:22:05 -0400
Subject: [PATCH] mm/mempolicy: fix use-after-free of VMA iterator
set_mempolicy_home_node() iterates over a list of VMAs and calls
mbind_range() on each VMA, which also iterates over the singular list of
the VMA passed in and potentially splits the VMA. Since the VMA iterator
is not passed through, set_mempolicy_home_node() may now point to a stale
node in the VMA tree. This can result in a UAF as reported by syzbot.
Avoid the stale maple tree node by passing the VMA iterator through to the
underlying call to split_vma().
mbind_range() is also overly complicated, since there are two calling
functions and one already handles iterating over the VMAs. Simplify
mbind_range() to only handle merging and splitting of the VMAs.
Align the new loop in do_mbind() and existing loop in
set_mempolicy_home_node() to use the reduced mbind_range() function. This
allows for a single location of the range calculation and avoids
constantly looking up the previous VMA (since this is a loop over the
VMAs).
Link: https://lore.kernel.org/linux-mm/000000000000c93feb05f87e24ad@google.com/
Fixes: 66850be55e8e ("mm/mempolicy: use vma iterator & maple state instead of vma linked list")
Signed-off-by: Liam R. Howlett <Liam.Howlett(a)oracle.com>
Reported-by: syzbot+a7c1ec5b1d71ceaa5186(a)syzkaller.appspotmail.com
Link: https://lkml.kernel.org/r/20230410152205.2294819-1-Liam.Howlett@oracle.com
Tested-by: syzbot+a7c1ec5b1d71ceaa5186(a)syzkaller.appspotmail.com
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index a256a241fd1d..2068b594dc88 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -790,61 +790,50 @@ static int vma_replace_policy(struct vm_area_struct *vma,
return err;
}
-/* Step 2: apply policy to a range and do splits. */
-static int mbind_range(struct mm_struct *mm, unsigned long start,
- unsigned long end, struct mempolicy *new_pol)
+/* Split or merge the VMA (if required) and apply the new policy */
+static int mbind_range(struct vma_iterator *vmi, struct vm_area_struct *vma,
+ struct vm_area_struct **prev, unsigned long start,
+ unsigned long end, struct mempolicy *new_pol)
{
- VMA_ITERATOR(vmi, mm, start);
- struct vm_area_struct *prev;
- struct vm_area_struct *vma;
- int err = 0;
+ struct vm_area_struct *merged;
+ unsigned long vmstart, vmend;
pgoff_t pgoff;
+ int err;
- prev = vma_prev(&vmi);
- vma = vma_find(&vmi, end);
- if (WARN_ON(!vma))
+ vmend = min(end, vma->vm_end);
+ if (start > vma->vm_start) {
+ *prev = vma;
+ vmstart = start;
+ } else {
+ vmstart = vma->vm_start;
+ }
+
+ if (mpol_equal(vma_policy(vma), new_pol))
return 0;
- if (start > vma->vm_start)
- prev = vma;
-
- do {
- unsigned long vmstart = max(start, vma->vm_start);
- unsigned long vmend = min(end, vma->vm_end);
-
- if (mpol_equal(vma_policy(vma), new_pol))
- goto next;
-
- pgoff = vma->vm_pgoff +
- ((vmstart - vma->vm_start) >> PAGE_SHIFT);
- prev = vma_merge(&vmi, mm, prev, vmstart, vmend, vma->vm_flags,
- vma->anon_vma, vma->vm_file, pgoff,
- new_pol, vma->vm_userfaultfd_ctx,
- anon_vma_name(vma));
- if (prev) {
- vma = prev;
- goto replace;
- }
- if (vma->vm_start != vmstart) {
- err = split_vma(&vmi, vma, vmstart, 1);
- if (err)
- goto out;
- }
- if (vma->vm_end != vmend) {
- err = split_vma(&vmi, vma, vmend, 0);
- if (err)
- goto out;
- }
-replace:
- err = vma_replace_policy(vma, new_pol);
+ pgoff = vma->vm_pgoff + ((vmstart - vma->vm_start) >> PAGE_SHIFT);
+ merged = vma_merge(vmi, vma->vm_mm, *prev, vmstart, vmend, vma->vm_flags,
+ vma->anon_vma, vma->vm_file, pgoff, new_pol,
+ vma->vm_userfaultfd_ctx, anon_vma_name(vma));
+ if (merged) {
+ *prev = merged;
+ return vma_replace_policy(merged, new_pol);
+ }
+
+ if (vma->vm_start != vmstart) {
+ err = split_vma(vmi, vma, vmstart, 1);
if (err)
- goto out;
-next:
- prev = vma;
- } for_each_vma_range(vmi, vma, end);
+ return err;
+ }
-out:
- return err;
+ if (vma->vm_end != vmend) {
+ err = split_vma(vmi, vma, vmend, 0);
+ if (err)
+ return err;
+ }
+
+ *prev = vma;
+ return vma_replace_policy(vma, new_pol);
}
/* Set the process memory policy */
@@ -1259,6 +1248,8 @@ static long do_mbind(unsigned long start, unsigned long len,
nodemask_t *nmask, unsigned long flags)
{
struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma, *prev;
+ struct vma_iterator vmi;
struct mempolicy *new;
unsigned long end;
int err;
@@ -1328,7 +1319,13 @@ static long do_mbind(unsigned long start, unsigned long len,
goto up_out;
}
- err = mbind_range(mm, start, end, new);
+ vma_iter_init(&vmi, mm, start);
+ prev = vma_prev(&vmi);
+ for_each_vma_range(vmi, vma, end) {
+ err = mbind_range(&vmi, vma, &prev, start, end, new);
+ if (err)
+ break;
+ }
if (!err) {
int nr_failed = 0;
@@ -1489,10 +1486,8 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le
unsigned long, home_node, unsigned long, flags)
{
struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma;
+ struct vm_area_struct *vma, *prev;
struct mempolicy *new, *old;
- unsigned long vmstart;
- unsigned long vmend;
unsigned long end;
int err = -ENOENT;
VMA_ITERATOR(vmi, mm, start);
@@ -1521,6 +1516,7 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le
if (end == start)
return 0;
mmap_write_lock(mm);
+ prev = vma_prev(&vmi);
for_each_vma_range(vmi, vma, end) {
/*
* If any vma in the range got policy other than MPOL_BIND
@@ -1541,9 +1537,7 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le
}
new->home_node = home_node;
- vmstart = max(start, vma->vm_start);
- vmend = min(end, vma->vm_end);
- err = mbind_range(mm, vmstart, vmend, new);
+ err = mbind_range(&vmi, vma, &prev, start, end, new);
mpol_put(new);
if (err)
break;
The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 24bf08c4376be417f16ceb609188b16f461b0443
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2023042218-hexagon-cheese-b961@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
24bf08c4376b ("mm/userfaultfd: fix uffd-wp handling for THP migration entries")
6c287605fd56 ("mm: remember exclusively mapped anonymous pages with PG_anon_exclusive")
6c54dc6c7437 ("mm/rmap: use page_move_anon_rmap() when reusing a mapped PageAnon() page exclusively")
28c5209dfd5f ("mm/rmap: pass rmap flags to hugepage_add_anon_rmap()")
f1e2db12e45b ("mm/rmap: remove do_page_add_anon_rmap()")
14f9135d5470 ("mm/rmap: convert RMAP flags to a proper distinct rmap_t type")
fb3d824d1a46 ("mm/rmap: split page_dup_rmap() into page_dup_file_rmap() and page_try_dup_anon_rmap()")
b51ad4f8679e ("mm/memory: slightly simplify copy_present_pte()")
623a1ddfeb23 ("mm/hugetlb: take src_mm->write_protect_seq in copy_hugetlb_page_range()")
3bff7e3f1f16 ("mm/huge_memory: streamline COW logic in do_huge_pmd_wp_page()")
c145e0b47c77 ("mm: streamline COW logic in do_swap_page()")
84d60fdd3733 ("mm: slightly clarify KSM logic in do_swap_page()")
53a05ad9f21d ("mm: optimize do_wp_page() for exclusive pages in the swapcache")
9030fb0bb9d6 ("Merge tag 'folio-5.18c' of git://git.infradead.org/users/willy/pagecache")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 24bf08c4376be417f16ceb609188b16f461b0443 Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david(a)redhat.com>
Date: Wed, 5 Apr 2023 18:02:35 +0200
Subject: [PATCH] mm/userfaultfd: fix uffd-wp handling for THP migration
entries
Looks like what we fixed for hugetlb in commit 44f86392bdd1 ("mm/hugetlb:
fix uffd-wp handling for migration entries in
hugetlb_change_protection()") similarly applies to THP.
Setting/clearing uffd-wp on THP migration entries is not implemented
properly. Further, while removing migration PMDs considers the uffd-wp
bit, inserting migration PMDs does not consider the uffd-wp bit.
We have to set/clear independently of the migration entry type in
change_huge_pmd() and properly copy the uffd-wp bit in
set_pmd_migration_entry().
Verified using a simple reproducer that triggers migration of a THP, that
the set_pmd_migration_entry() no longer loses the uffd-wp bit.
Link: https://lkml.kernel.org/r/20230405160236.587705-2-david@redhat.com
Fixes: f45ec5ff16a7 ("userfaultfd: wp: support swap and page migration")
Signed-off-by: David Hildenbrand <david(a)redhat.com>
Reviewed-by: Peter Xu <peterx(a)redhat.com>
Cc: <stable(a)vger.kernel.org>
Cc: Muhammad Usama Anjum <usama.anjum(a)collabora.com>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 032fb0ef9cd1..e3706a2b34b2 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1838,10 +1838,10 @@ int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
if (is_swap_pmd(*pmd)) {
swp_entry_t entry = pmd_to_swp_entry(*pmd);
struct page *page = pfn_swap_entry_to_page(entry);
+ pmd_t newpmd;
VM_BUG_ON(!is_pmd_migration_entry(*pmd));
if (is_writable_migration_entry(entry)) {
- pmd_t newpmd;
/*
* A protection check is difficult so
* just be safe and disable write
@@ -1855,8 +1855,16 @@ int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
newpmd = pmd_swp_mksoft_dirty(newpmd);
if (pmd_swp_uffd_wp(*pmd))
newpmd = pmd_swp_mkuffd_wp(newpmd);
- set_pmd_at(mm, addr, pmd, newpmd);
+ } else {
+ newpmd = *pmd;
}
+
+ if (uffd_wp)
+ newpmd = pmd_swp_mkuffd_wp(newpmd);
+ else if (uffd_wp_resolve)
+ newpmd = pmd_swp_clear_uffd_wp(newpmd);
+ if (!pmd_same(*pmd, newpmd))
+ set_pmd_at(mm, addr, pmd, newpmd);
goto unlock;
}
#endif
@@ -3251,6 +3259,8 @@ int set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
pmdswp = swp_entry_to_pmd(entry);
if (pmd_soft_dirty(pmdval))
pmdswp = pmd_swp_mksoft_dirty(pmdswp);
+ if (pmd_uffd_wp(pmdval))
+ pmdswp = pmd_swp_mkuffd_wp(pmdswp);
set_pmd_at(mm, address, pvmw->pmd, pmdswp);
page_remove_rmap(page, vma, true);
put_page(page);
The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 24bf08c4376be417f16ceb609188b16f461b0443
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2023042216-retainer-immersion-5428@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
24bf08c4376b ("mm/userfaultfd: fix uffd-wp handling for THP migration entries")
6c287605fd56 ("mm: remember exclusively mapped anonymous pages with PG_anon_exclusive")
6c54dc6c7437 ("mm/rmap: use page_move_anon_rmap() when reusing a mapped PageAnon() page exclusively")
28c5209dfd5f ("mm/rmap: pass rmap flags to hugepage_add_anon_rmap()")
f1e2db12e45b ("mm/rmap: remove do_page_add_anon_rmap()")
14f9135d5470 ("mm/rmap: convert RMAP flags to a proper distinct rmap_t type")
fb3d824d1a46 ("mm/rmap: split page_dup_rmap() into page_dup_file_rmap() and page_try_dup_anon_rmap()")
b51ad4f8679e ("mm/memory: slightly simplify copy_present_pte()")
623a1ddfeb23 ("mm/hugetlb: take src_mm->write_protect_seq in copy_hugetlb_page_range()")
3bff7e3f1f16 ("mm/huge_memory: streamline COW logic in do_huge_pmd_wp_page()")
c145e0b47c77 ("mm: streamline COW logic in do_swap_page()")
84d60fdd3733 ("mm: slightly clarify KSM logic in do_swap_page()")
53a05ad9f21d ("mm: optimize do_wp_page() for exclusive pages in the swapcache")
9030fb0bb9d6 ("Merge tag 'folio-5.18c' of git://git.infradead.org/users/willy/pagecache")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 24bf08c4376be417f16ceb609188b16f461b0443 Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david(a)redhat.com>
Date: Wed, 5 Apr 2023 18:02:35 +0200
Subject: [PATCH] mm/userfaultfd: fix uffd-wp handling for THP migration
entries
Looks like what we fixed for hugetlb in commit 44f86392bdd1 ("mm/hugetlb:
fix uffd-wp handling for migration entries in
hugetlb_change_protection()") similarly applies to THP.
Setting/clearing uffd-wp on THP migration entries is not implemented
properly. Further, while removing migration PMDs considers the uffd-wp
bit, inserting migration PMDs does not consider the uffd-wp bit.
We have to set/clear independently of the migration entry type in
change_huge_pmd() and properly copy the uffd-wp bit in
set_pmd_migration_entry().
Verified using a simple reproducer that triggers migration of a THP, that
the set_pmd_migration_entry() no longer loses the uffd-wp bit.
Link: https://lkml.kernel.org/r/20230405160236.587705-2-david@redhat.com
Fixes: f45ec5ff16a7 ("userfaultfd: wp: support swap and page migration")
Signed-off-by: David Hildenbrand <david(a)redhat.com>
Reviewed-by: Peter Xu <peterx(a)redhat.com>
Cc: <stable(a)vger.kernel.org>
Cc: Muhammad Usama Anjum <usama.anjum(a)collabora.com>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 032fb0ef9cd1..e3706a2b34b2 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1838,10 +1838,10 @@ int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
if (is_swap_pmd(*pmd)) {
swp_entry_t entry = pmd_to_swp_entry(*pmd);
struct page *page = pfn_swap_entry_to_page(entry);
+ pmd_t newpmd;
VM_BUG_ON(!is_pmd_migration_entry(*pmd));
if (is_writable_migration_entry(entry)) {
- pmd_t newpmd;
/*
* A protection check is difficult so
* just be safe and disable write
@@ -1855,8 +1855,16 @@ int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
newpmd = pmd_swp_mksoft_dirty(newpmd);
if (pmd_swp_uffd_wp(*pmd))
newpmd = pmd_swp_mkuffd_wp(newpmd);
- set_pmd_at(mm, addr, pmd, newpmd);
+ } else {
+ newpmd = *pmd;
}
+
+ if (uffd_wp)
+ newpmd = pmd_swp_mkuffd_wp(newpmd);
+ else if (uffd_wp_resolve)
+ newpmd = pmd_swp_clear_uffd_wp(newpmd);
+ if (!pmd_same(*pmd, newpmd))
+ set_pmd_at(mm, addr, pmd, newpmd);
goto unlock;
}
#endif
@@ -3251,6 +3259,8 @@ int set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
pmdswp = swp_entry_to_pmd(entry);
if (pmd_soft_dirty(pmdval))
pmdswp = pmd_swp_mksoft_dirty(pmdswp);
+ if (pmd_uffd_wp(pmdval))
+ pmdswp = pmd_swp_mkuffd_wp(pmdswp);
set_pmd_at(mm, address, pvmw->pmd, pmdswp);
page_remove_rmap(page, vma, true);
put_page(page);
The patch below does not apply to the 6.2-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.2.y
git checkout FETCH_HEAD
git cherry-pick -x 0b5dfe12755f87ec014bb4cc1930485026167430
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2023042210-apache-rally-cc5e@gregkh' --subject-prefix 'PATCH 6.2.y' HEAD^..
Possible dependencies:
0b5dfe12755f ("drm/amd/display: fix a divided-by-zero error")
13b90cf900ab ("drm/amd/display: fix PSR-SU/DSC interoperability support")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 0b5dfe12755f87ec014bb4cc1930485026167430 Mon Sep 17 00:00:00 2001
From: Alex Hung <alex.hung(a)amd.com>
Date: Mon, 3 Apr 2023 17:45:41 +0800
Subject: [PATCH] drm/amd/display: fix a divided-by-zero error
[Why & How]
timing.dsc_cfg.num_slices_v can be zero and it is necessary to check
before using it.
This fixes the error "divide error: 0000 [#1] PREEMPT SMP NOPTI".
Reviewed-by: Aurabindo Pillai <Aurabindo.Pillai(a)amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo(a)amd.com>
Signed-off-by: Alex Hung <alex.hung(a)amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler(a)amd.com>
Signed-off-by: Alex Deucher <alexander.deucher(a)amd.com>
Cc: stable(a)vger.kernel.org
diff --git a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
index e39b133d05af..b56f07f99d09 100644
--- a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
+++ b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
@@ -934,6 +934,10 @@ bool psr_su_set_dsc_slice_height(struct dc *dc, struct dc_link *link,
pic_height = stream->timing.v_addressable +
stream->timing.v_border_top + stream->timing.v_border_bottom;
+
+ if (stream->timing.dsc_cfg.num_slices_v == 0)
+ return false;
+
slice_height = pic_height / stream->timing.dsc_cfg.num_slices_v;
config->dsc_slice_height = slice_height;
The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 0b5dfe12755f87ec014bb4cc1930485026167430
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2023042209-scuff-accustom-83bb@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..
Possible dependencies:
0b5dfe12755f ("drm/amd/display: fix a divided-by-zero error")
13b90cf900ab ("drm/amd/display: fix PSR-SU/DSC interoperability support")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 0b5dfe12755f87ec014bb4cc1930485026167430 Mon Sep 17 00:00:00 2001
From: Alex Hung <alex.hung(a)amd.com>
Date: Mon, 3 Apr 2023 17:45:41 +0800
Subject: [PATCH] drm/amd/display: fix a divided-by-zero error
[Why & How]
timing.dsc_cfg.num_slices_v can be zero and it is necessary to check
before using it.
This fixes the error "divide error: 0000 [#1] PREEMPT SMP NOPTI".
Reviewed-by: Aurabindo Pillai <Aurabindo.Pillai(a)amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo(a)amd.com>
Signed-off-by: Alex Hung <alex.hung(a)amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler(a)amd.com>
Signed-off-by: Alex Deucher <alexander.deucher(a)amd.com>
Cc: stable(a)vger.kernel.org
diff --git a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
index e39b133d05af..b56f07f99d09 100644
--- a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
+++ b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
@@ -934,6 +934,10 @@ bool psr_su_set_dsc_slice_height(struct dc *dc, struct dc_link *link,
pic_height = stream->timing.v_addressable +
stream->timing.v_border_top + stream->timing.v_border_bottom;
+
+ if (stream->timing.dsc_cfg.num_slices_v == 0)
+ return false;
+
slice_height = pic_height / stream->timing.dsc_cfg.num_slices_v;
config->dsc_slice_height = slice_height;
The patch below does not apply to the 6.2-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.2.y
git checkout FETCH_HEAD
git cherry-pick -x 1e994cc0956b8dabd1b1fef315bbd722733b8aa8
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2023042204-threefold-stingy-5bc3@gregkh' --subject-prefix 'PATCH 6.2.y' HEAD^..
Possible dependencies:
1e994cc0956b ("drm/amd/display: limit timing for single dimm memory")
71c4ca2d3b07 ("drm/amd/display: Remove stutter only configurations")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 1e994cc0956b8dabd1b1fef315bbd722733b8aa8 Mon Sep 17 00:00:00 2001
From: Daniel Miess <Daniel.Miess(a)amd.com>
Date: Tue, 4 Apr 2023 14:04:11 -0400
Subject: [PATCH] drm/amd/display: limit timing for single dimm memory
[Why]
1. It could hit bandwidth limitdation under single dimm
memory when connecting 8K external monitor.
2. IsSupportedVidPn got validation failed with
2K240Hz eDP + 8K24Hz external monitor.
3. It's better to filter out such combination in
EnumVidPnCofuncModality
4. For short term, filter out in dc bandwidth validation.
[How]
Force 2K@240Hz+8K@24Hz timing validation false in dc.
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas(a)amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo(a)amd.com>
Signed-off-by: Daniel Miess <Daniel.Miess(a)amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler(a)amd.com>
Signed-off-by: Alex Deucher <alexander.deucher(a)amd.com>
Cc: stable(a)vger.kernel.org
diff --git a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
index 54ed3de869d3..9ffba4c6fe55 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
@@ -1697,6 +1697,23 @@ static void dcn314_get_panel_config_defaults(struct dc_panel_config *panel_confi
*panel_config = panel_config_defaults;
}
+static bool filter_modes_for_single_channel_workaround(struct dc *dc,
+ struct dc_state *context)
+{
+ // Filter 2K@240Hz+8K@24fps above combination timing if memory only has single dimm LPDDR
+ if (dc->clk_mgr->bw_params->vram_type == 34 && dc->clk_mgr->bw_params->num_channels < 2) {
+ int total_phy_pix_clk = 0;
+
+ for (int i = 0; i < context->stream_count; i++)
+ if (context->res_ctx.pipe_ctx[i].stream)
+ total_phy_pix_clk += context->res_ctx.pipe_ctx[i].stream->phy_pix_clk;
+
+ if (total_phy_pix_clk >= (1148928+826260)) //2K@240Hz+8K@24fps
+ return true;
+ }
+ return false;
+}
+
bool dcn314_validate_bandwidth(struct dc *dc,
struct dc_state *context,
bool fast_validate)
@@ -1712,6 +1729,9 @@ bool dcn314_validate_bandwidth(struct dc *dc,
BW_VAL_TRACE_COUNT();
+ if (filter_modes_for_single_channel_workaround(dc, context))
+ goto validate_fail;
+
DC_FP_START();
// do not support self refresh only
out = dcn30_internal_validate_bw(dc, context, pipes, &pipe_cnt, &vlevel, fast_validate, false);
The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 1e994cc0956b8dabd1b1fef315bbd722733b8aa8
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2023042202-confused-runt-7bf2@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..
Possible dependencies:
1e994cc0956b ("drm/amd/display: limit timing for single dimm memory")
71c4ca2d3b07 ("drm/amd/display: Remove stutter only configurations")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 1e994cc0956b8dabd1b1fef315bbd722733b8aa8 Mon Sep 17 00:00:00 2001
From: Daniel Miess <Daniel.Miess(a)amd.com>
Date: Tue, 4 Apr 2023 14:04:11 -0400
Subject: [PATCH] drm/amd/display: limit timing for single dimm memory
[Why]
1. It could hit bandwidth limitdation under single dimm
memory when connecting 8K external monitor.
2. IsSupportedVidPn got validation failed with
2K240Hz eDP + 8K24Hz external monitor.
3. It's better to filter out such combination in
EnumVidPnCofuncModality
4. For short term, filter out in dc bandwidth validation.
[How]
Force 2K@240Hz+8K@24Hz timing validation false in dc.
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas(a)amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo(a)amd.com>
Signed-off-by: Daniel Miess <Daniel.Miess(a)amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler(a)amd.com>
Signed-off-by: Alex Deucher <alexander.deucher(a)amd.com>
Cc: stable(a)vger.kernel.org
diff --git a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
index 54ed3de869d3..9ffba4c6fe55 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
@@ -1697,6 +1697,23 @@ static void dcn314_get_panel_config_defaults(struct dc_panel_config *panel_confi
*panel_config = panel_config_defaults;
}
+static bool filter_modes_for_single_channel_workaround(struct dc *dc,
+ struct dc_state *context)
+{
+ // Filter 2K@240Hz+8K@24fps above combination timing if memory only has single dimm LPDDR
+ if (dc->clk_mgr->bw_params->vram_type == 34 && dc->clk_mgr->bw_params->num_channels < 2) {
+ int total_phy_pix_clk = 0;
+
+ for (int i = 0; i < context->stream_count; i++)
+ if (context->res_ctx.pipe_ctx[i].stream)
+ total_phy_pix_clk += context->res_ctx.pipe_ctx[i].stream->phy_pix_clk;
+
+ if (total_phy_pix_clk >= (1148928+826260)) //2K@240Hz+8K@24fps
+ return true;
+ }
+ return false;
+}
+
bool dcn314_validate_bandwidth(struct dc *dc,
struct dc_state *context,
bool fast_validate)
@@ -1712,6 +1729,9 @@ bool dcn314_validate_bandwidth(struct dc *dc,
BW_VAL_TRACE_COUNT();
+ if (filter_modes_for_single_channel_workaround(dc, context))
+ goto validate_fail;
+
DC_FP_START();
// do not support self refresh only
out = dcn30_internal_validate_bw(dc, context, pipes, &pipe_cnt, &vlevel, fast_validate, false);