October 2024 - Linux-stable-mirror

[PATCH] Bluetooth: Fix type of len in rfcomm_sock_{bind,getsockopt_old}()

by Andrej Shadura

Commit 9bf4e919ccad worked around an issue introduced after an innocuous optimisation change in LLVM main: > len is defined as an 'int' because it is assigned from > '__user int *optlen'. However, it is clamped against the result of > sizeof(), which has a type of 'size_t' ('unsigned long' for 64-bit > platforms). This is done with min_t() because min() requires compatible > types, which results in both len and the result of sizeof() being casted > to 'unsigned int', meaning len changes signs and the result of sizeof() > is truncated. From there, len is passed to copy_to_user(), which has a > third parameter type of 'unsigned long', so it is widened and changes > signs again. This excessive casting in combination with the KCSAN > instrumentation causes LLVM to fail to eliminate the __bad_copy_from() > call, failing the build. The same issue occurs in rfcomm in functions rfcomm_sock_bind and rfcomm_sock_getsockopt_old. Change the type of len to size_t in both rfcomm_sock_bind and rfcomm_sock_getsockopt_old and replace min_t() with min(). Cc: stable(a)vger.kernel.org Fixes: 9bf4e919ccad ("Bluetooth: Fix type of len in {l2cap,sco}_sock_getsockopt_old()") Link: https://github.com/ClangBuiltLinux/linux/issues/2007 Link: https://github.com/llvm/llvm-project/issues/85647 Signed-off-by: Andrej Shadura <andrew.shadura(a)collabora.co.uk> --- net/bluetooth/rfcomm/sock.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c index 37d63d768afb..c0fe96673b3c 100644 --- a/net/bluetooth/rfcomm/sock.c +++ b/net/bluetooth/rfcomm/sock.c @@ -328,14 +328,15 @@ static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr { struct sockaddr_rc sa; struct sock *sk = sock->sk; - int len, err = 0; + int err = 0; + size_t len; if (!addr || addr_len < offsetofend(struct sockaddr, sa_family) || addr->sa_family != AF_BLUETOOTH) return -EINVAL; memset(&sa, 0, sizeof(sa)); - len = min_t(unsigned int, sizeof(sa), addr_len); + len = min(sizeof(sa), addr_len); memcpy(&sa, addr, len); BT_DBG("sk %p %pMR", sk, &sa.rc_bdaddr); @@ -729,7 +730,8 @@ static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __u struct sock *l2cap_sk; struct l2cap_conn *conn; struct rfcomm_conninfo cinfo; - int len, err = 0; + int err = 0; + size_t len; u32 opt; BT_DBG("sk %p", sk); @@ -783,7 +785,7 @@ static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __u cinfo.hci_handle = conn->hcon->handle; memcpy(cinfo.dev_class, conn->hcon->dev_class, 3); - len = min_t(unsigned int, len, sizeof(cinfo)); + len = min(len, sizeof(cinfo)); if (copy_to_user(optval, (char *) &cinfo, len)) err = -EFAULT; -- 2.43.0

3 months

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FAILED: patch "[PATCH] mm: z3fold: deprecate CONFIG_Z3FOLD" failed to apply to 6.1-stable tree

by gregkh＠linuxfoundation.org

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 7a2369b74abf76cd3e54c45b30f6addb497f831b # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100711-ebook-refund-46f3@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: 7a2369b74abf ("mm: z3fold: deprecate CONFIG_Z3FOLD") 04cb7502a5d7 ("zsmalloc: use all available 24 bits of page_type") 43d746dc49bb ("mm/zsmalloc: use a proper page type") 8db00ad56461 ("mm: allow reuse of the lower 16 bit of the page type with an actual type") 6d21dde7adc0 ("mm: update _mapcount and page_type documentation") ff202303c398 ("mm: convert page type macros to enum") 46df8e73a4a3 ("mm: free up PG_slab") d99e3140a4d3 ("mm: turn folio_test_hugetlb into a PageType") fd1a745ce03e ("mm: support page_mapcount() on page_has_type() pages") 29cfe7556bfd ("mm: constify more page/folio tests") 443cbaf9e2fd ("crash: split vmcoreinfo exporting code out from crash_core.c") 85fcde402db1 ("kexec: split crashkernel reservation code out from crash_core.c") 55c49fee57af ("mm/vmalloc: remove vmap_area_list") d093602919ad ("mm: vmalloc: remove global vmap_area_root rb-tree") 7fa8cee00316 ("mm: vmalloc: move vmap_init_free_space() down in vmalloc.c") 4a693ce65b18 ("kdump: defer the insertion of crashkernel resources") 9f2a63523582 ("Merge tag 'mm-nonmm-stable-2024-01-09-10-33' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 7a2369b74abf76cd3e54c45b30f6addb497f831b Mon Sep 17 00:00:00 2001 From: Yosry Ahmed <yosryahmed(a)google.com> Date: Wed, 4 Sep 2024 23:33:43 +0000 Subject: [PATCH] mm: z3fold: deprecate CONFIG_Z3FOLD The z3fold compressed pages allocator is rarely used, most users use zsmalloc. The only disadvantage of zsmalloc in comparison is the dependency on MMU, and zbud is a more common option for !MMU as it was the default zswap allocator for a long time. Historically, zsmalloc had worse latency than zbud and z3fold but offered better memory savings. This is no longer the case as shown by a simple recent analysis [1]. That analysis showed that z3fold does not have any advantage over zsmalloc or zbud considering both performance and memory usage. In a kernel build test on tmpfs in a limited cgroup, z3fold took 3% more time and used 1.8% more memory. The latency of zswap_load() was 7% higher, and that of zswap_store() was 10% higher. Zsmalloc is better in all metrics. Moreover, z3fold apparently has latent bugs, which was made noticeable by a recent soft lockup bug report with z3fold [2]. Switching to zsmalloc not only fixed the problem, but also reduced the swap usage from 6~8G to 1~2G. Other users have also reported being bitten by mistakenly enabling z3fold. Other than hurting users, z3fold is repeatedly causing wasted engineering effort. Apart from investigating the above bug, it came up in multiple development discussions (e.g. [3]) as something we need to handle, when there aren't any legit users (at least not intentionally). The natural course of action is to deprecate z3fold, and remove in a few cycles if no objections are raised from active users. Next on the list should be zbud, as it offers marginal latency gains at the cost of huge memory waste when compared to zsmalloc. That one will need to wait until zsmalloc does not depend on MMU. Rename the user-visible config option from CONFIG_Z3FOLD to CONFIG_Z3FOLD_DEPRECATED so that users with CONFIG_Z3FOLD=y get a new prompt with explanation during make oldconfig. Also, remove CONFIG_Z3FOLD=y from defconfigs. [1]https://lore.kernel.org/lkml/CAJD7tkbRF6od-2x_L8-A1QL3=2Ww13sCj4S3i4bNndq… [2]https://lore.kernel.org/lkml/EF0ABD3E-A239-4111-A8AB-5C442E759CF3@gmail.c… [3]https://lore.kernel.org/lkml/CAJD7tkbnmeVugfunffSovJf9FAgy9rhBVt_tx=nxUve… [arnd(a)arndb.de: deprecate ZSWAP_ZPOOL_DEFAULT_Z3FOLD as well] Link: https://lkml.kernel.org/r/20240909202625.1054880-1-arnd@kernel.org Link: https://lkml.kernel.org/r/20240904233343.933462-1-yosryahmed@google.com Signed-off-by: Yosry Ahmed <yosryahmed(a)google.com> Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> Acked-by: Chris Down <chris(a)chrisdown.name> Acked-by: Nhat Pham <nphamcs(a)gmail.com> Acked-by: Johannes Weiner <hannes(a)cmpxchg.org> Acked-by: Vitaly Wool <vitaly.wool(a)konsulko.com> Acked-by: Christoph Hellwig <hch(a)lst.de> Cc: Aneesh Kumar K.V <aneesh.kumar(a)kernel.org> Cc: Christophe Leroy <christophe.leroy(a)csgroup.eu> Cc: Huacai Chen <chenhuacai(a)kernel.org> Cc: Miaohe Lin <linmiaohe(a)huawei.com> Cc: Michael Ellerman <mpe(a)ellerman.id.au> Cc: Naveen N. Rao <naveen.n.rao(a)linux.ibm.com> Cc: Nicholas Piggin <npiggin(a)gmail.com> Cc: Sergey Senozhatsky <senozhatsky(a)chromium.org> Cc: WANG Xuerui <kernel(a)xen0n.name> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> diff --git a/arch/loongarch/configs/loongson3_defconfig b/arch/loongarch/configs/loongson3_defconfig index b4252c357c8e..75b366407a60 100644 --- a/arch/loongarch/configs/loongson3_defconfig +++ b/arch/loongarch/configs/loongson3_defconfig @@ -96,7 +96,6 @@ CONFIG_ZPOOL=y CONFIG_ZSWAP=y CONFIG_ZSWAP_COMPRESSOR_DEFAULT_ZSTD=y CONFIG_ZBUD=y -CONFIG_Z3FOLD=y CONFIG_ZSMALLOC=m # CONFIG_COMPAT_BRK is not set CONFIG_MEMORY_HOTPLUG=y diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc/configs/ppc64_defconfig index 544a65fda77b..d39284489aa2 100644 --- a/arch/powerpc/configs/ppc64_defconfig +++ b/arch/powerpc/configs/ppc64_defconfig @@ -81,7 +81,6 @@ CONFIG_MODULE_SIG_SHA512=y CONFIG_PARTITION_ADVANCED=y CONFIG_BINFMT_MISC=m CONFIG_ZSWAP=y -CONFIG_Z3FOLD=y CONFIG_ZSMALLOC=y # CONFIG_SLAB_MERGE_DEFAULT is not set CONFIG_SLAB_FREELIST_RANDOM=y diff --git a/mm/Kconfig b/mm/Kconfig index 1aa282e35dc7..09aebca1cae3 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -146,12 +146,15 @@ config ZSWAP_ZPOOL_DEFAULT_ZBUD help Use the zbud allocator as the default allocator. -config ZSWAP_ZPOOL_DEFAULT_Z3FOLD - bool "z3fold" - select Z3FOLD +config ZSWAP_ZPOOL_DEFAULT_Z3FOLD_DEPRECATED + bool "z3foldi (DEPRECATED)" + select Z3FOLD_DEPRECATED help Use the z3fold allocator as the default allocator. + Deprecated and scheduled for removal in a few cycles, + see CONFIG_Z3FOLD_DEPRECATED. + config ZSWAP_ZPOOL_DEFAULT_ZSMALLOC bool "zsmalloc" select ZSMALLOC @@ -163,7 +166,7 @@ config ZSWAP_ZPOOL_DEFAULT string depends on ZSWAP default "zbud" if ZSWAP_ZPOOL_DEFAULT_ZBUD - default "z3fold" if ZSWAP_ZPOOL_DEFAULT_Z3FOLD + default "z3fold" if ZSWAP_ZPOOL_DEFAULT_Z3FOLD_DEPRECATED default "zsmalloc" if ZSWAP_ZPOOL_DEFAULT_ZSMALLOC default "" @@ -177,15 +180,25 @@ config ZBUD deterministic reclaim properties that make it preferable to a higher density approach when reclaim will be used. -config Z3FOLD - tristate "3:1 compression allocator (z3fold)" +config Z3FOLD_DEPRECATED + tristate "3:1 compression allocator (z3fold) (DEPRECATED)" depends on ZSWAP help + Deprecated and scheduled for removal in a few cycles. If you have + a good reason for using Z3FOLD over ZSMALLOC, please contact + linux-mm(a)kvack.org and the zswap maintainers. + A special purpose allocator for storing compressed pages. It is designed to store up to three compressed pages per physical page. It is a ZBUD derivative so the simplicity and determinism are still there. +config Z3FOLD + tristate + default y if Z3FOLD_DEPRECATED=y + default m if Z3FOLD_DEPRECATED=m + depends on Z3FOLD_DEPRECATED + config ZSMALLOC tristate prompt "N:1 compression allocator (zsmalloc)" if (ZSWAP || ZRAM)

3 months

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Re: Patch "coredump: Standartize and fix logging" has been added to the 6.10-stable tree

by Roman Kisel

Sasha, Thank you very much for taking this to the stable kernel! With the 6.12-rc1, folks saw unkillable processes, and the suspicion was that get_task_comm() takes a lock on the task_struct. Kees was kind enough to look into that and sent out https://lore.kernel.org/all/20240928210830.work.307-kees@kernel.org/. As much as I'd love to see these logs produced by the kernel to help with core dump diagnostics, I am really worried that lock might cause more harm than the patches bring value, let alone this is a stable kernel, and as I understand, folks might run very important workloads trusting the stable kernel. If you see why these patches are good for the stable kernel (e.g. there is no lock as in 6.12), I trust your judgement. Added Kees and Eric in hopes they have time to help if this is a good change for the stable kernel. Thank you all for your help! On 10/6/2024 8:27 AM, Sasha Levin wrote: > This is a note to let you know that I've just added the patch titled > > coredump: Standartize and fix logging > > to the 6.10-stable tree which can be found at: > http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… > > The filename of the patch is: > coredump-standartize-and-fix-logging.patch > and it can be found in the queue-6.10 subdirectory. > > If you, or anyone else, feels it should not be added to the stable tree, > please let <stable(a)vger.kernel.org> know about it. > > > > commit f0a5649db30d6ff2509281ace680db9cc08ce258 > Author: Roman Kisel <romank(a)linux.microsoft.com> > Date: Thu Jul 18 11:27:24 2024 -0700 > > coredump: Standartize and fix logging > > [ Upstream commit c114e9948c2b6a0b400266e59cc656b59e795bca ] > > The coredump code does not log the process ID and the comm > consistently, logs unescaped comm when it does log it, and > does not always use the ratelimited logging. That makes it > harder to analyze logs and puts the system at the risk of > spamming the system log incase something crashes many times > over and over again. > > Fix that by logging TGID and comm (escaped) consistently and > using the ratelimited logging always. > > Signed-off-by: Roman Kisel <romank(a)linux.microsoft.com> > Tested-by: Allen Pais <apais(a)linux.microsoft.com> > Link: https://lore.kernel.org/r/20240718182743.1959160-2-romank@linux.microsoft.c… > Signed-off-by: Kees Cook <kees(a)kernel.org> > Signed-off-by: Sasha Levin <sashal(a)kernel.org> > > diff --git a/fs/coredump.c b/fs/coredump.c > index a57a06b80f571..19d3343b93c6b 100644 > --- a/fs/coredump.c > +++ b/fs/coredump.c > @@ -586,8 +586,7 @@ void do_coredump(const kernel_siginfo_t *siginfo) > struct subprocess_info *sub_info; > > if (ispipe < 0) { > - printk(KERN_WARNING "format_corename failed\n"); > - printk(KERN_WARNING "Aborting core\n"); > + coredump_report_failure("format_corename failed, aborting core"); > goto fail_unlock; > } > > @@ -607,27 +606,21 @@ void do_coredump(const kernel_siginfo_t *siginfo) > * right pid if a thread in a multi-threaded > * core_pattern process dies. > */ > - printk(KERN_WARNING > - "Process %d(%s) has RLIMIT_CORE set to 1\n", > - task_tgid_vnr(current), current->comm); > - printk(KERN_WARNING "Aborting core\n"); > + coredump_report_failure("RLIMIT_CORE is set to 1, aborting core"); > goto fail_unlock; > } > cprm.limit = RLIM_INFINITY; > > dump_count = atomic_inc_return(&core_dump_count); > if (core_pipe_limit && (core_pipe_limit < dump_count)) { > - printk(KERN_WARNING "Pid %d(%s) over core_pipe_limit\n", > - task_tgid_vnr(current), current->comm); > - printk(KERN_WARNING "Skipping core dump\n"); > + coredump_report_failure("over core_pipe_limit, skipping core dump"); > goto fail_dropcount; > } > > helper_argv = kmalloc_array(argc + 1, sizeof(*helper_argv), > GFP_KERNEL); > if (!helper_argv) { > - printk(KERN_WARNING "%s failed to allocate memory\n", > - __func__); > + coredump_report_failure("%s failed to allocate memory", __func__); > goto fail_dropcount; > } > for (argi = 0; argi < argc; argi++) > @@ -644,8 +637,7 @@ void do_coredump(const kernel_siginfo_t *siginfo) > > kfree(helper_argv); > if (retval) { > - printk(KERN_INFO "Core dump to |%s pipe failed\n", > - cn.corename); > + coredump_report_failure("|%s pipe failed", cn.corename); > goto close_fail; > } > } else { > @@ -658,10 +650,8 @@ void do_coredump(const kernel_siginfo_t *siginfo) > goto fail_unlock; > > if (need_suid_safe && cn.corename[0] != '/') { > - printk(KERN_WARNING "Pid %d(%s) can only dump core "\ > - "to fully qualified path!\n", > - task_tgid_vnr(current), current->comm); > - printk(KERN_WARNING "Skipping core dump\n"); > + coredump_report_failure( > + "this process can only dump core to a fully qualified path, skipping core dump"); > goto fail_unlock; > } > > @@ -730,13 +720,13 @@ void do_coredump(const kernel_siginfo_t *siginfo) > idmap = file_mnt_idmap(cprm.file); > if (!vfsuid_eq_kuid(i_uid_into_vfsuid(idmap, inode), > current_fsuid())) { > - pr_info_ratelimited("Core dump to %s aborted: cannot preserve file owner\n", > - cn.corename); > + coredump_report_failure("Core dump to %s aborted: " > + "cannot preserve file owner", cn.corename); > goto close_fail; > } > if ((inode->i_mode & 0677) != 0600) { > - pr_info_ratelimited("Core dump to %s aborted: cannot preserve file permissions\n", > - cn.corename); > + coredump_report_failure("Core dump to %s aborted: " > + "cannot preserve file permissions", cn.corename); > goto close_fail; > } > if (!(cprm.file->f_mode & FMODE_CAN_WRITE)) > @@ -757,7 +747,7 @@ void do_coredump(const kernel_siginfo_t *siginfo) > * have this set to NULL. > */ > if (!cprm.file) { > - pr_info("Core dump to |%s disabled\n", cn.corename); > + coredump_report_failure("Core dump to |%s disabled", cn.corename); > goto close_fail; > } > if (!dump_vma_snapshot(&cprm)) > @@ -983,11 +973,10 @@ void validate_coredump_safety(void) > { > if (suid_dumpable == SUID_DUMP_ROOT && > core_pattern[0] != '/' && core_pattern[0] != '|') { > - pr_warn( > -"Unsafe core_pattern used with fs.suid_dumpable=2.\n" > -"Pipe handler or fully qualified core dump path required.\n" > -"Set kernel.core_pattern before fs.suid_dumpable.\n" > - ); > + > + coredump_report_failure("Unsafe core_pattern used with fs.suid_dumpable=2: " > + "pipe handler or fully qualified core dump path required. " > + "Set kernel.core_pattern before fs.suid_dumpable."); > } > } > > diff --git a/include/linux/coredump.h b/include/linux/coredump.h > index 0904ba010341a..45e598fe34766 100644 > --- a/include/linux/coredump.h > +++ b/include/linux/coredump.h > @@ -43,8 +43,30 @@ extern int dump_align(struct coredump_params *cprm, int align); > int dump_user_range(struct coredump_params *cprm, unsigned long start, > unsigned long len); > extern void do_coredump(const kernel_siginfo_t *siginfo); > + > +/* > + * Logging for the coredump code, ratelimited. > + * The TGID and comm fields are added to the message. > + */ > + > +#define __COREDUMP_PRINTK(Level, Format, ...) \ > + do { \ > + char comm[TASK_COMM_LEN]; \ > + \ > + get_task_comm(comm, current); \ > + printk_ratelimited(Level "coredump: %d(%*pE): " Format "\n", \ > + task_tgid_vnr(current), (int)strlen(comm), comm, ##__VA_ARGS__); \ > + } while (0) \ > + > +#define coredump_report(fmt, ...) __COREDUMP_PRINTK(KERN_INFO, fmt, ##__VA_ARGS__) > +#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__) > + > #else > static inline void do_coredump(const kernel_siginfo_t *siginfo) {} > + > +#define coredump_report(...) > +#define coredump_report_failure(...) > + > #endif > > #if defined(CONFIG_COREDUMP) && defined(CONFIG_SYSCTL) -- Thank you, Roman

3 months

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FAILED: patch "[PATCH] drm/sched: Always increment correct scheduler score" failed to apply to 5.15-stable tree

by gregkh＠linuxfoundation.org

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 087913e0ba2b3b9d7ccbafb2acf5dab9e35ae1d5 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100755-preacher-reformist-f489@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: 087913e0ba2b ("drm/sched: Always increment correct scheduler score") cbc8764e29c2 ("drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job") 440d52b370b0 ("drm/sched: Fix dynamic job-flow control race") f92a39ae4707 ("drm/sched: Partial revert of "Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()"") a78422e9dff3 ("drm/sched: implement dynamic job-flow control") f3123c259000 ("drm/sched: Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()") bc8d6a9df990 ("drm/sched: Don't disturb the entity when in RR-mode scheduling") f12af4c461fb ("drm/sched: Drop suffix from drm_sched_wakeup_if_can_queue") 35a4279d42db ("drm/sched: Rename drm_sched_run_job_queue_if_ready and clarify kerneldoc") 67dd1d8c9f65 ("drm/sched: Rename drm_sched_free_job_queue to be more descriptive") e608d9f7ac1a ("drm/sched: Move free worker re-queuing out of the if block") 7abbbe2694b3 ("drm/sched: Rename drm_sched_get_cleanup_job to be more descriptive") f7fe64ad0f22 ("drm/sched: Split free_job into own work item") a6149f039369 ("drm/sched: Convert drm scheduler to use a work queue rather than kthread") 35963cf2cd25 ("drm/sched: Add drm_sched_wqueue_* helpers") 0da611a87021 ("dma-buf: add dma_fence_timestamp helper") 56e449603f0a ("drm/sched: Convert the GPU scheduler to variable number of run-queues") b88baab82871 ("drm/nouveau: implement new VM_BIND uAPI") 7b05a7c0c9ca ("drm/nouveau: get vmm via nouveau_cli_vmm()") e02238990b1a ("drm/nouveau: new VM_BIND uAPI interfaces") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 087913e0ba2b3b9d7ccbafb2acf5dab9e35ae1d5 Mon Sep 17 00:00:00 2001 From: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Date: Tue, 24 Sep 2024 11:19:09 +0100 Subject: [PATCH] drm/sched: Always increment correct scheduler score MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Entities run queue can change during drm_sched_entity_push_job() so make sure to update the score consistently. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: d41a39dda140 ("drm/scheduler: improve job distribution with multiple queues") Cc: Nirmoy Das <nirmoy.das(a)amd.com> Cc: Christian König <christian.koenig(a)amd.com> Cc: Luben Tuikov <ltuikov89(a)gmail.com> Cc: Matthew Brost <matthew.brost(a)intel.com> Cc: David Airlie <airlied(a)gmail.com> Cc: Daniel Vetter <daniel(a)ffwll.ch> Cc: dri-devel(a)lists.freedesktop.org Cc: <stable(a)vger.kernel.org> # v5.9+ Reviewed-by: Christian König <christian.koenig(a)amd.com> Reviewed-by: Nirmoy Das <nirmoy.das(a)intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240924101914.2713-4-tursuli… Signed-off-by: Christian König <christian.koenig(a)amd.com> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index a75eede8bf8d..b2cf3e0c1838 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -586,7 +586,6 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) ktime_t submit_ts; trace_drm_sched_job(sched_job, entity); - atomic_inc(entity->rq->sched->score); WRITE_ONCE(entity->last_user, current->group_leader); /* @@ -614,6 +613,7 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) rq = entity->rq; sched = rq->sched; + atomic_inc(sched->score); drm_sched_rq_add_entity(rq, entity); spin_unlock(&entity->rq_lock);

3 months

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FAILED: patch "[PATCH] drm/sched: Always increment correct scheduler score" failed to apply to 5.10-stable tree

by gregkh＠linuxfoundation.org

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 087913e0ba2b3b9d7ccbafb2acf5dab9e35ae1d5 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100755-unedited-smuggler-ece7@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^.. Possible dependencies: 087913e0ba2b ("drm/sched: Always increment correct scheduler score") cbc8764e29c2 ("drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job") 440d52b370b0 ("drm/sched: Fix dynamic job-flow control race") f92a39ae4707 ("drm/sched: Partial revert of "Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()"") a78422e9dff3 ("drm/sched: implement dynamic job-flow control") f3123c259000 ("drm/sched: Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()") bc8d6a9df990 ("drm/sched: Don't disturb the entity when in RR-mode scheduling") f12af4c461fb ("drm/sched: Drop suffix from drm_sched_wakeup_if_can_queue") 35a4279d42db ("drm/sched: Rename drm_sched_run_job_queue_if_ready and clarify kerneldoc") 67dd1d8c9f65 ("drm/sched: Rename drm_sched_free_job_queue to be more descriptive") e608d9f7ac1a ("drm/sched: Move free worker re-queuing out of the if block") 7abbbe2694b3 ("drm/sched: Rename drm_sched_get_cleanup_job to be more descriptive") f7fe64ad0f22 ("drm/sched: Split free_job into own work item") a6149f039369 ("drm/sched: Convert drm scheduler to use a work queue rather than kthread") 35963cf2cd25 ("drm/sched: Add drm_sched_wqueue_* helpers") 0da611a87021 ("dma-buf: add dma_fence_timestamp helper") 56e449603f0a ("drm/sched: Convert the GPU scheduler to variable number of run-queues") b88baab82871 ("drm/nouveau: implement new VM_BIND uAPI") 7b05a7c0c9ca ("drm/nouveau: get vmm via nouveau_cli_vmm()") e02238990b1a ("drm/nouveau: new VM_BIND uAPI interfaces") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 087913e0ba2b3b9d7ccbafb2acf5dab9e35ae1d5 Mon Sep 17 00:00:00 2001 From: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Date: Tue, 24 Sep 2024 11:19:09 +0100 Subject: [PATCH] drm/sched: Always increment correct scheduler score MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Entities run queue can change during drm_sched_entity_push_job() so make sure to update the score consistently. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: d41a39dda140 ("drm/scheduler: improve job distribution with multiple queues") Cc: Nirmoy Das <nirmoy.das(a)amd.com> Cc: Christian König <christian.koenig(a)amd.com> Cc: Luben Tuikov <ltuikov89(a)gmail.com> Cc: Matthew Brost <matthew.brost(a)intel.com> Cc: David Airlie <airlied(a)gmail.com> Cc: Daniel Vetter <daniel(a)ffwll.ch> Cc: dri-devel(a)lists.freedesktop.org Cc: <stable(a)vger.kernel.org> # v5.9+ Reviewed-by: Christian König <christian.koenig(a)amd.com> Reviewed-by: Nirmoy Das <nirmoy.das(a)intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240924101914.2713-4-tursuli… Signed-off-by: Christian König <christian.koenig(a)amd.com> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index a75eede8bf8d..b2cf3e0c1838 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -586,7 +586,6 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) ktime_t submit_ts; trace_drm_sched_job(sched_job, entity); - atomic_inc(entity->rq->sched->score); WRITE_ONCE(entity->last_user, current->group_leader); /* @@ -614,6 +613,7 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) rq = entity->rq; sched = rq->sched; + atomic_inc(sched->score); drm_sched_rq_add_entity(rq, entity); spin_unlock(&entity->rq_lock);

3 months

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FAILED: patch "[PATCH] drm/sched: Always increment correct scheduler score" failed to apply to 6.1-stable tree

by gregkh＠linuxfoundation.org

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 087913e0ba2b3b9d7ccbafb2acf5dab9e35ae1d5 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100754-headlock-unbridle-a6ed@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: 087913e0ba2b ("drm/sched: Always increment correct scheduler score") cbc8764e29c2 ("drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job") 440d52b370b0 ("drm/sched: Fix dynamic job-flow control race") f92a39ae4707 ("drm/sched: Partial revert of "Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()"") a78422e9dff3 ("drm/sched: implement dynamic job-flow control") f3123c259000 ("drm/sched: Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()") bc8d6a9df990 ("drm/sched: Don't disturb the entity when in RR-mode scheduling") f12af4c461fb ("drm/sched: Drop suffix from drm_sched_wakeup_if_can_queue") 35a4279d42db ("drm/sched: Rename drm_sched_run_job_queue_if_ready and clarify kerneldoc") 67dd1d8c9f65 ("drm/sched: Rename drm_sched_free_job_queue to be more descriptive") e608d9f7ac1a ("drm/sched: Move free worker re-queuing out of the if block") 7abbbe2694b3 ("drm/sched: Rename drm_sched_get_cleanup_job to be more descriptive") f7fe64ad0f22 ("drm/sched: Split free_job into own work item") a6149f039369 ("drm/sched: Convert drm scheduler to use a work queue rather than kthread") 35963cf2cd25 ("drm/sched: Add drm_sched_wqueue_* helpers") 0da611a87021 ("dma-buf: add dma_fence_timestamp helper") 56e449603f0a ("drm/sched: Convert the GPU scheduler to variable number of run-queues") b88baab82871 ("drm/nouveau: implement new VM_BIND uAPI") 7b05a7c0c9ca ("drm/nouveau: get vmm via nouveau_cli_vmm()") e02238990b1a ("drm/nouveau: new VM_BIND uAPI interfaces") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 087913e0ba2b3b9d7ccbafb2acf5dab9e35ae1d5 Mon Sep 17 00:00:00 2001 From: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Date: Tue, 24 Sep 2024 11:19:09 +0100 Subject: [PATCH] drm/sched: Always increment correct scheduler score MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Entities run queue can change during drm_sched_entity_push_job() so make sure to update the score consistently. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: d41a39dda140 ("drm/scheduler: improve job distribution with multiple queues") Cc: Nirmoy Das <nirmoy.das(a)amd.com> Cc: Christian König <christian.koenig(a)amd.com> Cc: Luben Tuikov <ltuikov89(a)gmail.com> Cc: Matthew Brost <matthew.brost(a)intel.com> Cc: David Airlie <airlied(a)gmail.com> Cc: Daniel Vetter <daniel(a)ffwll.ch> Cc: dri-devel(a)lists.freedesktop.org Cc: <stable(a)vger.kernel.org> # v5.9+ Reviewed-by: Christian König <christian.koenig(a)amd.com> Reviewed-by: Nirmoy Das <nirmoy.das(a)intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240924101914.2713-4-tursuli… Signed-off-by: Christian König <christian.koenig(a)amd.com> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index a75eede8bf8d..b2cf3e0c1838 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -586,7 +586,6 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) ktime_t submit_ts; trace_drm_sched_job(sched_job, entity); - atomic_inc(entity->rq->sched->score); WRITE_ONCE(entity->last_user, current->group_leader); /* @@ -614,6 +613,7 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) rq = entity->rq; sched = rq->sched; + atomic_inc(sched->score); drm_sched_rq_add_entity(rq, entity); spin_unlock(&entity->rq_lock);

3 months

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FAILED: patch "[PATCH] drm/sched: Always increment correct scheduler score" failed to apply to 6.6-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.6-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-6.6.y git checkout FETCH_HEAD git cherry-pick -x 087913e0ba2b3b9d7ccbafb2acf5dab9e35ae1d5 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100753-refusing-absolve-0e53@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: 087913e0ba2b ("drm/sched: Always increment correct scheduler score") cbc8764e29c2 ("drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job") 440d52b370b0 ("drm/sched: Fix dynamic job-flow control race") f92a39ae4707 ("drm/sched: Partial revert of "Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()"") a78422e9dff3 ("drm/sched: implement dynamic job-flow control") f3123c259000 ("drm/sched: Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()") bc8d6a9df990 ("drm/sched: Don't disturb the entity when in RR-mode scheduling") f12af4c461fb ("drm/sched: Drop suffix from drm_sched_wakeup_if_can_queue") 35a4279d42db ("drm/sched: Rename drm_sched_run_job_queue_if_ready and clarify kerneldoc") 67dd1d8c9f65 ("drm/sched: Rename drm_sched_free_job_queue to be more descriptive") e608d9f7ac1a ("drm/sched: Move free worker re-queuing out of the if block") 7abbbe2694b3 ("drm/sched: Rename drm_sched_get_cleanup_job to be more descriptive") f7fe64ad0f22 ("drm/sched: Split free_job into own work item") a6149f039369 ("drm/sched: Convert drm scheduler to use a work queue rather than kthread") 35963cf2cd25 ("drm/sched: Add drm_sched_wqueue_* helpers") 0da611a87021 ("dma-buf: add dma_fence_timestamp helper") 56e449603f0a ("drm/sched: Convert the GPU scheduler to variable number of run-queues") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 087913e0ba2b3b9d7ccbafb2acf5dab9e35ae1d5 Mon Sep 17 00:00:00 2001 From: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Date: Tue, 24 Sep 2024 11:19:09 +0100 Subject: [PATCH] drm/sched: Always increment correct scheduler score MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Entities run queue can change during drm_sched_entity_push_job() so make sure to update the score consistently. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: d41a39dda140 ("drm/scheduler: improve job distribution with multiple queues") Cc: Nirmoy Das <nirmoy.das(a)amd.com> Cc: Christian König <christian.koenig(a)amd.com> Cc: Luben Tuikov <ltuikov89(a)gmail.com> Cc: Matthew Brost <matthew.brost(a)intel.com> Cc: David Airlie <airlied(a)gmail.com> Cc: Daniel Vetter <daniel(a)ffwll.ch> Cc: dri-devel(a)lists.freedesktop.org Cc: <stable(a)vger.kernel.org> # v5.9+ Reviewed-by: Christian König <christian.koenig(a)amd.com> Reviewed-by: Nirmoy Das <nirmoy.das(a)intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240924101914.2713-4-tursuli… Signed-off-by: Christian König <christian.koenig(a)amd.com> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index a75eede8bf8d..b2cf3e0c1838 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -586,7 +586,6 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) ktime_t submit_ts; trace_drm_sched_job(sched_job, entity); - atomic_inc(entity->rq->sched->score); WRITE_ONCE(entity->last_user, current->group_leader); /* @@ -614,6 +613,7 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) rq = entity->rq; sched = rq->sched; + atomic_inc(sched->score); drm_sched_rq_add_entity(rq, entity); spin_unlock(&entity->rq_lock);

3 months

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FAILED: patch "[PATCH] drm/sched: Always wake up correct scheduler in" failed to apply to 5.10-stable tree

by gregkh＠linuxfoundation.org

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 cbc8764e29c2318229261a679b2aafd0f9072885 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100741-crying-undrilled-a32f@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^.. Possible dependencies: cbc8764e29c2 ("drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job") 440d52b370b0 ("drm/sched: Fix dynamic job-flow control race") f92a39ae4707 ("drm/sched: Partial revert of "Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()"") a78422e9dff3 ("drm/sched: implement dynamic job-flow control") f3123c259000 ("drm/sched: Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()") bc8d6a9df990 ("drm/sched: Don't disturb the entity when in RR-mode scheduling") f12af4c461fb ("drm/sched: Drop suffix from drm_sched_wakeup_if_can_queue") 35a4279d42db ("drm/sched: Rename drm_sched_run_job_queue_if_ready and clarify kerneldoc") 67dd1d8c9f65 ("drm/sched: Rename drm_sched_free_job_queue to be more descriptive") e608d9f7ac1a ("drm/sched: Move free worker re-queuing out of the if block") 7abbbe2694b3 ("drm/sched: Rename drm_sched_get_cleanup_job to be more descriptive") f7fe64ad0f22 ("drm/sched: Split free_job into own work item") a6149f039369 ("drm/sched: Convert drm scheduler to use a work queue rather than kthread") 35963cf2cd25 ("drm/sched: Add drm_sched_wqueue_* helpers") 0da611a87021 ("dma-buf: add dma_fence_timestamp helper") 56e449603f0a ("drm/sched: Convert the GPU scheduler to variable number of run-queues") b88baab82871 ("drm/nouveau: implement new VM_BIND uAPI") 7b05a7c0c9ca ("drm/nouveau: get vmm via nouveau_cli_vmm()") e02238990b1a ("drm/nouveau: new VM_BIND uAPI interfaces") 7a5d5f9c0587 ("drm/nouveau: fixup the uapi header file.") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From cbc8764e29c2318229261a679b2aafd0f9072885 Mon Sep 17 00:00:00 2001 From: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Date: Tue, 24 Sep 2024 11:19:08 +0100 Subject: [PATCH] drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Since drm_sched_entity_modify_sched() can modify the entities run queue, lets make sure to only dereference the pointer once so both adding and waking up are guaranteed to be consistent. Alternative of moving the spin_unlock to after the wake up would for now be more problematic since the same lock is taken inside drm_sched_rq_update_fifo(). v2: * Improve commit message. (Philipp) * Cache the scheduler pointer directly. (Christian) Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: b37aced31eb0 ("drm/scheduler: implement a function to modify sched list") Cc: Christian König <christian.koenig(a)amd.com> Cc: Alex Deucher <alexander.deucher(a)amd.com> Cc: Luben Tuikov <ltuikov89(a)gmail.com> Cc: Matthew Brost <matthew.brost(a)intel.com> Cc: David Airlie <airlied(a)gmail.com> Cc: Daniel Vetter <daniel(a)ffwll.ch> Cc: Philipp Stanner <pstanner(a)redhat.com> Cc: dri-devel(a)lists.freedesktop.org Cc: <stable(a)vger.kernel.org> # v5.7+ Reviewed-by: Christian König <christian.koenig(a)amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240924101914.2713-3-tursuli… Signed-off-by: Christian König <christian.koenig(a)amd.com> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index 0e002c17fcb6..a75eede8bf8d 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -599,6 +599,9 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) /* first job wakes up scheduler */ if (first) { + struct drm_gpu_scheduler *sched; + struct drm_sched_rq *rq; + /* Add the entity to the run queue */ spin_lock(&entity->rq_lock); if (entity->stopped) { @@ -608,13 +611,16 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) return; } - drm_sched_rq_add_entity(entity->rq, entity); + rq = entity->rq; + sched = rq->sched; + + drm_sched_rq_add_entity(rq, entity); spin_unlock(&entity->rq_lock); if (drm_sched_policy == DRM_SCHED_POLICY_FIFO) drm_sched_rq_update_fifo(entity, submit_ts); - drm_sched_wakeup(entity->rq->sched); + drm_sched_wakeup(sched); } } EXPORT_SYMBOL(drm_sched_entity_push_job);

3 months

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FAILED: patch "[PATCH] drm/sched: Always wake up correct scheduler in" failed to apply to 5.15-stable tree

by gregkh＠linuxfoundation.org

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 cbc8764e29c2318229261a679b2aafd0f9072885 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100740-hardhat-tastiness-be43@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: cbc8764e29c2 ("drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job") 440d52b370b0 ("drm/sched: Fix dynamic job-flow control race") f92a39ae4707 ("drm/sched: Partial revert of "Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()"") a78422e9dff3 ("drm/sched: implement dynamic job-flow control") f3123c259000 ("drm/sched: Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()") bc8d6a9df990 ("drm/sched: Don't disturb the entity when in RR-mode scheduling") f12af4c461fb ("drm/sched: Drop suffix from drm_sched_wakeup_if_can_queue") 35a4279d42db ("drm/sched: Rename drm_sched_run_job_queue_if_ready and clarify kerneldoc") 67dd1d8c9f65 ("drm/sched: Rename drm_sched_free_job_queue to be more descriptive") e608d9f7ac1a ("drm/sched: Move free worker re-queuing out of the if block") 7abbbe2694b3 ("drm/sched: Rename drm_sched_get_cleanup_job to be more descriptive") f7fe64ad0f22 ("drm/sched: Split free_job into own work item") a6149f039369 ("drm/sched: Convert drm scheduler to use a work queue rather than kthread") 35963cf2cd25 ("drm/sched: Add drm_sched_wqueue_* helpers") 0da611a87021 ("dma-buf: add dma_fence_timestamp helper") 56e449603f0a ("drm/sched: Convert the GPU scheduler to variable number of run-queues") b88baab82871 ("drm/nouveau: implement new VM_BIND uAPI") 7b05a7c0c9ca ("drm/nouveau: get vmm via nouveau_cli_vmm()") e02238990b1a ("drm/nouveau: new VM_BIND uAPI interfaces") 7a5d5f9c0587 ("drm/nouveau: fixup the uapi header file.") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From cbc8764e29c2318229261a679b2aafd0f9072885 Mon Sep 17 00:00:00 2001 From: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Date: Tue, 24 Sep 2024 11:19:08 +0100 Subject: [PATCH] drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Since drm_sched_entity_modify_sched() can modify the entities run queue, lets make sure to only dereference the pointer once so both adding and waking up are guaranteed to be consistent. Alternative of moving the spin_unlock to after the wake up would for now be more problematic since the same lock is taken inside drm_sched_rq_update_fifo(). v2: * Improve commit message. (Philipp) * Cache the scheduler pointer directly. (Christian) Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: b37aced31eb0 ("drm/scheduler: implement a function to modify sched list") Cc: Christian König <christian.koenig(a)amd.com> Cc: Alex Deucher <alexander.deucher(a)amd.com> Cc: Luben Tuikov <ltuikov89(a)gmail.com> Cc: Matthew Brost <matthew.brost(a)intel.com> Cc: David Airlie <airlied(a)gmail.com> Cc: Daniel Vetter <daniel(a)ffwll.ch> Cc: Philipp Stanner <pstanner(a)redhat.com> Cc: dri-devel(a)lists.freedesktop.org Cc: <stable(a)vger.kernel.org> # v5.7+ Reviewed-by: Christian König <christian.koenig(a)amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240924101914.2713-3-tursuli… Signed-off-by: Christian König <christian.koenig(a)amd.com> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index 0e002c17fcb6..a75eede8bf8d 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -599,6 +599,9 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) /* first job wakes up scheduler */ if (first) { + struct drm_gpu_scheduler *sched; + struct drm_sched_rq *rq; + /* Add the entity to the run queue */ spin_lock(&entity->rq_lock); if (entity->stopped) { @@ -608,13 +611,16 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) return; } - drm_sched_rq_add_entity(entity->rq, entity); + rq = entity->rq; + sched = rq->sched; + + drm_sched_rq_add_entity(rq, entity); spin_unlock(&entity->rq_lock); if (drm_sched_policy == DRM_SCHED_POLICY_FIFO) drm_sched_rq_update_fifo(entity, submit_ts); - drm_sched_wakeup(entity->rq->sched); + drm_sched_wakeup(sched); } } EXPORT_SYMBOL(drm_sched_entity_push_job);

3 months

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FAILED: patch "[PATCH] drm/sched: Always wake up correct scheduler in" failed to apply to 6.1-stable tree

by gregkh＠linuxfoundation.org

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 cbc8764e29c2318229261a679b2aafd0f9072885 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100739-habitant-profane-90df@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: cbc8764e29c2 ("drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job") 440d52b370b0 ("drm/sched: Fix dynamic job-flow control race") f92a39ae4707 ("drm/sched: Partial revert of "Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()"") a78422e9dff3 ("drm/sched: implement dynamic job-flow control") f3123c259000 ("drm/sched: Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()") bc8d6a9df990 ("drm/sched: Don't disturb the entity when in RR-mode scheduling") f12af4c461fb ("drm/sched: Drop suffix from drm_sched_wakeup_if_can_queue") 35a4279d42db ("drm/sched: Rename drm_sched_run_job_queue_if_ready and clarify kerneldoc") 67dd1d8c9f65 ("drm/sched: Rename drm_sched_free_job_queue to be more descriptive") e608d9f7ac1a ("drm/sched: Move free worker re-queuing out of the if block") 7abbbe2694b3 ("drm/sched: Rename drm_sched_get_cleanup_job to be more descriptive") f7fe64ad0f22 ("drm/sched: Split free_job into own work item") a6149f039369 ("drm/sched: Convert drm scheduler to use a work queue rather than kthread") 35963cf2cd25 ("drm/sched: Add drm_sched_wqueue_* helpers") 0da611a87021 ("dma-buf: add dma_fence_timestamp helper") 56e449603f0a ("drm/sched: Convert the GPU scheduler to variable number of run-queues") b88baab82871 ("drm/nouveau: implement new VM_BIND uAPI") 7b05a7c0c9ca ("drm/nouveau: get vmm via nouveau_cli_vmm()") e02238990b1a ("drm/nouveau: new VM_BIND uAPI interfaces") 7a5d5f9c0587 ("drm/nouveau: fixup the uapi header file.") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From cbc8764e29c2318229261a679b2aafd0f9072885 Mon Sep 17 00:00:00 2001 From: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Date: Tue, 24 Sep 2024 11:19:08 +0100 Subject: [PATCH] drm/sched: Always wake up correct scheduler in drm_sched_entity_push_job MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Since drm_sched_entity_modify_sched() can modify the entities run queue, lets make sure to only dereference the pointer once so both adding and waking up are guaranteed to be consistent. Alternative of moving the spin_unlock to after the wake up would for now be more problematic since the same lock is taken inside drm_sched_rq_update_fifo(). v2: * Improve commit message. (Philipp) * Cache the scheduler pointer directly. (Christian) Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: b37aced31eb0 ("drm/scheduler: implement a function to modify sched list") Cc: Christian König <christian.koenig(a)amd.com> Cc: Alex Deucher <alexander.deucher(a)amd.com> Cc: Luben Tuikov <ltuikov89(a)gmail.com> Cc: Matthew Brost <matthew.brost(a)intel.com> Cc: David Airlie <airlied(a)gmail.com> Cc: Daniel Vetter <daniel(a)ffwll.ch> Cc: Philipp Stanner <pstanner(a)redhat.com> Cc: dri-devel(a)lists.freedesktop.org Cc: <stable(a)vger.kernel.org> # v5.7+ Reviewed-by: Christian König <christian.koenig(a)amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240924101914.2713-3-tursuli… Signed-off-by: Christian König <christian.koenig(a)amd.com> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index 0e002c17fcb6..a75eede8bf8d 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -599,6 +599,9 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) /* first job wakes up scheduler */ if (first) { + struct drm_gpu_scheduler *sched; + struct drm_sched_rq *rq; + /* Add the entity to the run queue */ spin_lock(&entity->rq_lock); if (entity->stopped) { @@ -608,13 +611,16 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job) return; } - drm_sched_rq_add_entity(entity->rq, entity); + rq = entity->rq; + sched = rq->sched; + + drm_sched_rq_add_entity(rq, entity); spin_unlock(&entity->rq_lock); if (drm_sched_policy == DRM_SCHED_POLICY_FIFO) drm_sched_rq_update_fifo(entity, submit_ts); - drm_sched_wakeup(entity->rq->sched); + drm_sched_wakeup(sched); } } EXPORT_SYMBOL(drm_sched_entity_push_job);

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