July 2025 - Linux-stable-mirror

[REGRESSION] drm/amd/display: backlight brightness set to 0 at amdgpu initialization

by Lauri Tirkkonen

Hi, I hit this regression on the stable kernel on Alpine with a Lenovo Yoga Slim 7 Pro 17ACH5. During early boot, when the amdgpu module gets loaded, backlight brightness is set to zero, resulting in a black screen (and nothing in userspace is running yet to handle brightness keys; I need to use an external monitor or type in my rootfs passphrase blind). #regzbot introduced: 6c56c8ec6f9762c33bd22f31d43af4194d12da53 bisect log: git bisect start # status: waiting for both good and bad commits # good: [e60eb441596d1c70e4a264d2bac726c6cd2da067] Linux 6.15.4 git bisect good e60eb441596d1c70e4a264d2bac726c6cd2da067 # status: waiting for bad commit, 1 good commit known # bad: [1562d948232546cfad45a1beddc70fe0c7b34950] Linux 6.15.6 git bisect bad 1562d948232546cfad45a1beddc70fe0c7b34950 # good: [5e10620cb8e76279fd86411536c3fa0f486cd634] drm/xe/vm: move rebind_work init earlier git bisect good 5e10620cb8e76279fd86411536c3fa0f486cd634 # bad: [ece85751c3e46c0e3c4f772113f691b7aec81d5d] btrfs: record new subvolume in parent dir earlier to avoid dir logging races git bisect bad ece85751c3e46c0e3c4f772113f691b7aec81d5d # bad: [9f5d2487a9fad1d36bcf107d1f3b1ebc8b6796cf] iommufd/selftest: Add asserts testing global mfd git bisect bad 9f5d2487a9fad1d36bcf107d1f3b1ebc8b6796cf # good: [c0687ec5625b2261d48936d03c761e38657f4a4b] rust: completion: implement initial abstraction git bisect good c0687ec5625b2261d48936d03c761e38657f4a4b # bad: [889906e6eb5fab990c9b6b5fe8f1122b2416fc22] drm/amd/display: Export full brightness range to userspace git bisect bad 889906e6eb5fab990c9b6b5fe8f1122b2416fc22 # good: [c7d15ba11c8561c5f325ffeb27ed8a4e82d4d322] io_uring/kbuf: flag partial buffer mappings git bisect good c7d15ba11c8561c5f325ffeb27ed8a4e82d4d322 # good: [66089fa8c9ed162744037ab0375e38cc74c7f7ed] drm/amd/display: Add debugging message for brightness caps git bisect good 66089fa8c9ed162744037ab0375e38cc74c7f7ed # bad: [cd711c87c2862be5e71eee79901f94e1c943f9fc] drm/amd/display: Only read ACPI backlight caps once git bisect bad cd711c87c2862be5e71eee79901f94e1c943f9fc # bad: [6c56c8ec6f9762c33bd22f31d43af4194d12da53] drm/amd/display: Fix default DC and AC levels git bisect bad 6c56c8ec6f9762c33bd22f31d43af4194d12da53 # first bad commit: [6c56c8ec6f9762c33bd22f31d43af4194d12da53] drm/amd/display: Fix default DC and AC levels 'dmesg|grep amd' on 6.15.7 on this machine: [ 0.319726] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank). [ 4.090573] [drm] amdgpu kernel modesetting enabled. [ 4.094238] amdgpu: Virtual CRAT table created for CPU [ 4.095389] amdgpu: Topology: Add CPU node [ 4.096451] amdgpu 0000:03:00.0: enabling device (0006 -> 0007) [ 4.174815] amdgpu 0000:03:00.0: amdgpu: detected ip block number 0 <soc15_common> [ 4.176034] amdgpu 0000:03:00.0: amdgpu: detected ip block number 1 <gmc_v9_0> [ 4.176992] amdgpu 0000:03:00.0: amdgpu: detected ip block number 2 <vega10_ih> [ 4.177911] amdgpu 0000:03:00.0: amdgpu: detected ip block number 3 <psp> [ 4.178799] amdgpu 0000:03:00.0: amdgpu: detected ip block number 4 <smu> [ 4.179704] amdgpu 0000:03:00.0: amdgpu: detected ip block number 5 <dm> [ 4.180594] amdgpu 0000:03:00.0: amdgpu: detected ip block number 6 <gfx_v9_0> [ 4.181445] amdgpu 0000:03:00.0: amdgpu: detected ip block number 7 <sdma_v4_0> [ 4.182299] amdgpu 0000:03:00.0: amdgpu: detected ip block number 8 <vcn_v2_0> [ 4.183114] amdgpu 0000:03:00.0: amdgpu: detected ip block number 9 <jpeg_v2_0> [ 4.183910] amdgpu 0000:03:00.0: amdgpu: Fetched VBIOS from VFCT [ 4.184800] amdgpu: ATOM BIOS: 113-CEZANNE-017 [ 4.208484] amdgpu 0000:03:00.0: vgaarb: deactivate vga console [ 4.208493] amdgpu 0000:03:00.0: amdgpu: Trusted Memory Zone (TMZ) feature enabled [ 4.208509] amdgpu 0000:03:00.0: amdgpu: MODE2 reset [ 4.209086] amdgpu 0000:03:00.0: amdgpu: VRAM: 2048M 0x000000F400000000 - 0x000000F47FFFFFFF (2048M used) [ 4.209099] amdgpu 0000:03:00.0: amdgpu: GART: 1024M 0x0000000000000000 - 0x000000003FFFFFFF [ 4.209376] [drm] amdgpu: 2048M of VRAM memory ready [ 4.209386] [drm] amdgpu: 6912M of GTT memory ready. [ 4.210517] amdgpu 0000:03:00.0: amdgpu: Found VCN firmware Version ENC: 1.24 DEC: 8 VEP: 0 Revision: 3 [ 4.927350] amdgpu 0000:03:00.0: amdgpu: reserve 0x400000 from 0xf47f400000 for PSP TMR [ 5.010609] amdgpu 0000:03:00.0: amdgpu: RAS: optional ras ta ucode is not available [ 5.021347] amdgpu 0000:03:00.0: amdgpu: RAP: optional rap ta ucode is not available [ 5.021357] amdgpu 0000:03:00.0: amdgpu: SECUREDISPLAY: securedisplay ta ucode is not available [ 5.021725] amdgpu 0000:03:00.0: amdgpu: SMU is initialized successfully! [ 5.131949] amdgpu 0000:03:00.0: amdgpu: [drm] Using ACPI provided EDID for eDP-1 [ 5.385266] kfd kfd: amdgpu: Allocated 3969056 bytes on gart [ 5.385286] kfd kfd: amdgpu: Total number of KFD nodes to be created: 1 [ 5.385435] amdgpu: Virtual CRAT table created for GPU [ 5.385562] amdgpu: Topology: Add dGPU node [0x1638:0x1002] [ 5.385569] kfd kfd: amdgpu: added device 1002:1638 [ 5.385582] amdgpu 0000:03:00.0: amdgpu: SE 1, SH per SE 1, CU per SH 8, active_cu_number 8 [ 5.385592] amdgpu 0000:03:00.0: amdgpu: ring gfx uses VM inv eng 0 on hub 0 [ 5.385598] amdgpu 0000:03:00.0: amdgpu: ring comp_1.0.0 uses VM inv eng 1 on hub 0 [ 5.385605] amdgpu 0000:03:00.0: amdgpu: ring comp_1.1.0 uses VM inv eng 4 on hub 0 [ 5.385612] amdgpu 0000:03:00.0: amdgpu: ring comp_1.2.0 uses VM inv eng 5 on hub 0 [ 5.385619] amdgpu 0000:03:00.0: amdgpu: ring comp_1.3.0 uses VM inv eng 6 on hub 0 [ 5.385625] amdgpu 0000:03:00.0: amdgpu: ring comp_1.0.1 uses VM inv eng 7 on hub 0 [ 5.385632] amdgpu 0000:03:00.0: amdgpu: ring comp_1.1.1 uses VM inv eng 8 on hub 0 [ 5.385639] amdgpu 0000:03:00.0: amdgpu: ring comp_1.2.1 uses VM inv eng 9 on hub 0 [ 5.385645] amdgpu 0000:03:00.0: amdgpu: ring comp_1.3.1 uses VM inv eng 10 on hub 0 [ 5.385652] amdgpu 0000:03:00.0: amdgpu: ring kiq_0.2.1.0 uses VM inv eng 11 on hub 0 [ 5.385659] amdgpu 0000:03:00.0: amdgpu: ring sdma0 uses VM inv eng 0 on hub 8 [ 5.385665] amdgpu 0000:03:00.0: amdgpu: ring vcn_dec uses VM inv eng 1 on hub 8 [ 5.385672] amdgpu 0000:03:00.0: amdgpu: ring vcn_enc0 uses VM inv eng 4 on hub 8 [ 5.385679] amdgpu 0000:03:00.0: amdgpu: ring vcn_enc1 uses VM inv eng 5 on hub 8 [ 5.385685] amdgpu 0000:03:00.0: amdgpu: ring jpeg_dec uses VM inv eng 6 on hub 8 [ 5.454665] amdgpu 0000:03:00.0: amdgpu: Runtime PM not available [ 5.455003] amdgpu 0000:03:00.0: amdgpu: [drm] Using custom brightness curve [ 5.455339] [drm] Initialized amdgpu 3.63.0 for 0000:03:00.0 on minor 1 [ 5.480731] fbcon: amdgpudrmfb (fb0) is primary device [ 6.796057] amdgpu 0000:03:00.0: [drm] fb0: amdgpudrmfb frame buffer device -- Lauri Tirkkonen | lotheac @ IRCnet

3 months, 2 weeks

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[PATCH V2] efi/tpm: Fix the issue where the CC platforms event log header can't be correctly identified

by yangge1116＠126.com

From: Ge Yang <yangge1116(a)126.com> Since commit d228814b1913 ("efi/libstub: Add get_event_log() support for CC platforms") reuses TPM2 support code for the CC platforms, when launching a TDX virtual machine with coco measurement enabled, the following error log is generated: [Firmware Bug]: Failed to parse event in TPM Final Events Log Call Trace: efi_config_parse_tables() efi_tpm_eventlog_init() tpm2_calc_event_log_size() __calc_tpm2_event_size() The pcr_idx value in the Intel TDX log header is 1, causing the function __calc_tpm2_event_size() to fail to recognize the log header, ultimately leading to the "Failed to parse event in TPM Final Events Log" error. According to UEFI Specification 2.10, Section 38.4.1: For TDX, TPM PCR 0 maps to MRTD, so the log header uses TPM PCR 1 instead. To successfully parse the TDX event log header, the check for a pcr_idx value of 0 must be skipped. According to Table 6 in Section 10.2.1 of the TCG PC Client Specification, the index field does not require the PCR index to be fixed at zero. Therefore, skipping the check for a pcr_idx value of 0 for CC platforms is safe. Link: https://uefi.org/specs/UEFI/2.10/38_Confidential_Computing.html#intel-trust… Link: https://trustedcomputinggroup.org/wp-content/uploads/TCG_PCClient_PFP_r1p05… Fixes: d228814b1913 ("efi/libstub: Add get_event_log() support for CC platforms") Signed-off-by: Ge Yang <yangge1116(a)126.com> Cc: stable(a)vger.kernel.org --- V2: - limit the fix for CC only suggested by Jarkko and Sathyanarayanan drivers/char/tpm/eventlog/tpm2.c | 3 ++- drivers/firmware/efi/libstub/tpm.c | 13 +++++++++---- drivers/firmware/efi/tpm.c | 3 ++- include/linux/tpm_eventlog.h | 14 +++++++++++--- 4 files changed, 24 insertions(+), 9 deletions(-) diff --git a/drivers/char/tpm/eventlog/tpm2.c b/drivers/char/tpm/eventlog/tpm2.c index 37a0580..87a8b7f 100644 --- a/drivers/char/tpm/eventlog/tpm2.c +++ b/drivers/char/tpm/eventlog/tpm2.c @@ -36,7 +36,8 @@ static size_t calc_tpm2_event_size(struct tcg_pcr_event2_head *event, struct tcg_pcr_event *event_header) { - return __calc_tpm2_event_size(event, event_header, false); + return __calc_tpm2_event_size(event, event_header, false, + cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)); } static void *tpm2_bios_measurements_start(struct seq_file *m, loff_t *pos) diff --git a/drivers/firmware/efi/libstub/tpm.c b/drivers/firmware/efi/libstub/tpm.c index a5c6c4f..9728060 100644 --- a/drivers/firmware/efi/libstub/tpm.c +++ b/drivers/firmware/efi/libstub/tpm.c @@ -50,7 +50,8 @@ void efi_enable_reset_attack_mitigation(void) static void efi_retrieve_tcg2_eventlog(int version, efi_physical_addr_t log_location, efi_physical_addr_t log_last_entry, efi_bool_t truncated, - struct efi_tcg2_final_events_table *final_events_table) + struct efi_tcg2_final_events_table *final_events_table, + bool is_cc_event) { efi_guid_t linux_eventlog_guid = LINUX_EFI_TPM_EVENT_LOG_GUID; efi_status_t status; @@ -87,7 +88,8 @@ static void efi_retrieve_tcg2_eventlog(int version, efi_physical_addr_t log_loca last_entry_size = __calc_tpm2_event_size((void *)last_entry_addr, (void *)(long)log_location, - false); + false, + is_cc_event); } else { last_entry_size = sizeof(struct tcpa_event) + ((struct tcpa_event *) last_entry_addr)->event_size; @@ -123,7 +125,8 @@ static void efi_retrieve_tcg2_eventlog(int version, efi_physical_addr_t log_loca header = data + offset + final_events_size; event_size = __calc_tpm2_event_size(header, (void *)(long)log_location, - false); + false, + is_cc_event); /* If calc fails this is a malformed log */ if (!event_size) break; @@ -157,6 +160,7 @@ void efi_retrieve_eventlog(void) efi_tcg2_protocol_t *tpm2 = NULL; efi_bool_t truncated; efi_status_t status; + bool is_cc_event = false; status = efi_bs_call(locate_protocol, &tpm2_guid, NULL, (void **)&tpm2); if (status == EFI_SUCCESS) { @@ -186,11 +190,12 @@ void efi_retrieve_eventlog(void) final_events_table = get_efi_config_table(EFI_CC_FINAL_EVENTS_TABLE_GUID); + is_cc_event = true; } if (status != EFI_SUCCESS || !log_location) return; efi_retrieve_tcg2_eventlog(version, log_location, log_last_entry, - truncated, final_events_table); + truncated, final_events_table, is_cc_event); } diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c index cdd4310..a94816d 100644 --- a/drivers/firmware/efi/tpm.c +++ b/drivers/firmware/efi/tpm.c @@ -23,7 +23,8 @@ static int __init tpm2_calc_event_log_size(void *data, int count, void *size_inf while (count > 0) { header = data + size; - event_size = __calc_tpm2_event_size(header, size_info, true); + event_size = __calc_tpm2_event_size(header, size_info, true, + cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)); if (event_size == 0) return -1; size += event_size; diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h index 891368e..b3380c9 100644 --- a/include/linux/tpm_eventlog.h +++ b/include/linux/tpm_eventlog.h @@ -143,6 +143,7 @@ struct tcg_algorithm_info { * @event: Pointer to the event whose size should be calculated * @event_header: Pointer to the initial event containing the digest lengths * @do_mapping: Whether or not the event needs to be mapped + * @is_cc_event: Whether or not the event is from a CC platform * * The TPM2 event log format can contain multiple digests corresponding to * separate PCR banks, and also contains a variable length of the data that @@ -159,7 +160,8 @@ struct tcg_algorithm_info { static __always_inline u32 __calc_tpm2_event_size(struct tcg_pcr_event2_head *event, struct tcg_pcr_event *event_header, - bool do_mapping) + bool do_mapping, + bool is_cc_event) { struct tcg_efi_specid_event_head *efispecid; struct tcg_event_field *event_field; @@ -201,8 +203,14 @@ static __always_inline u32 __calc_tpm2_event_size(struct tcg_pcr_event2_head *ev count = event->count; event_type = event->event_type; - /* Verify that it's the log header */ - if (event_header->pcr_idx != 0 || + /* + * Verify that it's the log header. According to the TCG PC Client + * Specification, when identifying a log header, the check for a + * pcr_idx value of 0 is not required. For CC platforms, skipping + * this check during log header is necessary; otherwise, the CC + * platform's log header may fail to be recognized. + */ + if ((!is_cc_event && event_header->pcr_idx != 0) || event_header->event_type != NO_ACTION || memcmp(event_header->digest, zero_digest, sizeof(zero_digest))) { size = 0; -- 2.7.4

3 months, 2 weeks

4
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[PATCH 1/3] scsi: ufs: ufs-mediatek: Add UFS host support for MT8195 SoC

by Macpaul Lin

Add "mediatek,mt8195-ufshci" to the of_device_id table to enable support for MediaTek MT8195/MT8395 UFS host controller. This matches the device node entry in the MT8195/MT8395 device tree and allows proper driver binding. Signed-off-by: Macpaul Lin <macpaul.lin(a)mediatek.com> --- drivers/ufs/host/ufs-mediatek.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c index 182f58d0c9db..e1dbf0231c5e 100644 --- a/drivers/ufs/host/ufs-mediatek.c +++ b/drivers/ufs/host/ufs-mediatek.c @@ -50,6 +50,7 @@ static const struct ufs_dev_quirk ufs_mtk_dev_fixups[] = { static const struct of_device_id ufs_mtk_of_match[] = { { .compatible = "mediatek,mt8183-ufshci" }, + { .compatible = "mediatek,mt8195-ufshci" }, {}, }; MODULE_DEVICE_TABLE(of, ufs_mtk_of_match); -- 2.45.2

3 months, 2 weeks

3
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[PATCH v2 mm-hotfixes 5/5] x86/mm: drop unnecessary calls to sync_global_pgds() and fold into its sole user

by Harry Yoo

Now that p*d_populate_kernel{,init}() handles page table synchronization, calling sync_global_pgds() is no longer necessary. Remove those redundant calls. Additionally, since arch_sync_kernel_mappings() is now the only remaining caller of sync_global_pgds(), fold the function into its user. Cc: stable(a)vger.kernel.org Suggested-by: Dave Hansen <dave.hansen(a)linux.intel.com> Signed-off-by: Harry Yoo <harry.yoo(a)oracle.com> --- arch/x86/mm/init_64.c | 17 ++--------------- 1 file changed, 2 insertions(+), 15 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index e4922b9c8403..f1507de3b7a3 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -228,7 +228,7 @@ static void sync_global_pgds_l4(unsigned long start, unsigned long end) * When memory was added make sure all the processes MM have * suitable PGD entries in the local PGD level page. */ -static void sync_global_pgds(unsigned long start, unsigned long end) +void arch_sync_kernel_mappings(unsigned long start, unsigned long end) { if (pgtable_l5_enabled()) sync_global_pgds_l5(start, end); @@ -236,11 +236,6 @@ static void sync_global_pgds(unsigned long start, unsigned long end) sync_global_pgds_l4(start, end); } -void arch_sync_kernel_mappings(unsigned long start, unsigned long end) -{ - sync_global_pgds(start, end); -} - /* * NOTE: This function is marked __ref because it calls __init function * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. @@ -746,13 +741,11 @@ __kernel_physical_mapping_init(unsigned long paddr_start, unsigned long page_size_mask, pgprot_t prot, bool init) { - bool pgd_changed = false; - unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last; + unsigned long vaddr, vaddr_end, vaddr_next, paddr_last; paddr_last = paddr_end; vaddr = (unsigned long)__va(paddr_start); vaddr_end = (unsigned long)__va(paddr_end); - vaddr_start = vaddr; for (; vaddr < vaddr_end; vaddr = vaddr_next) { pgd_t *pgd = pgd_offset_k(vaddr); @@ -781,12 +774,8 @@ __kernel_physical_mapping_init(unsigned long paddr_start, (pud_t *) p4d, init); spin_unlock(&init_mm.page_table_lock); - pgd_changed = true; } - if (pgd_changed) - sync_global_pgds(vaddr_start, vaddr_end - 1); - return paddr_last; } @@ -1580,8 +1569,6 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, err = -ENOMEM; } else err = vmemmap_populate_basepages(start, end, node, NULL); - if (!err) - sync_global_pgds(start, end - 1); return err; } -- 2.43.0

3 months, 2 weeks

1
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[PATCH v2 mm-hotfixes 4/5] x86/mm: convert p*d_populate{,_init} to _kernel variants

by Harry Yoo

Introduce p*d_populate_kernel_safe() and convert p*d_populate{,_init}() to p*d_populate_kernel{,_init}() to ensure synchronization of kernel mappings when populating PGD entries. By converting them, we eliminate the risk of forgetting to synchronize top-level page tables after populating PGD entries. Cc: stable(a)vger.kernel.org Suggested-by: Dave Hansen <dave.hansen(a)linux.intel.com> Signed-off-by: Harry Yoo <harry.yoo(a)oracle.com> --- arch/x86/include/asm/pgalloc.h | 20 ++++++++++++++++++++ arch/x86/mm/init_64.c | 25 +++++++++++++++++++------ arch/x86/mm/kasan_init_64.c | 8 ++++---- 3 files changed, 43 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/pgalloc.h b/arch/x86/include/asm/pgalloc.h index ead834e8141a..aea3b16e7a35 100644 --- a/arch/x86/include/asm/pgalloc.h +++ b/arch/x86/include/asm/pgalloc.h @@ -122,6 +122,15 @@ static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pu set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud))); } +static inline void p4d_populate_kernel_safe(unsigned long addr, + p4d_t *p4d, pud_t *pud) +{ + paravirt_alloc_pud(&init_mm, __pa(pud) >> PAGE_SHIFT); + set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud))); + if (ARCH_PAGE_TABLE_SYNC_MASK & PGTBL_P4D_MODIFIED) + arch_sync_kernel_mappings(addr, addr); +} + extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud); static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, @@ -147,6 +156,17 @@ static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4 set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); } +static inline void pgd_populate_kernel_safe(unsigned long addr, + pgd_t *pgd, p4d_t *p4d) +{ + if (!pgtable_l5_enabled()) + return; + paravirt_alloc_p4d(&init_mm, __pa(p4d) >> PAGE_SHIFT); + set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); + if (ARCH_PAGE_TABLE_SYNC_MASK & PGTBL_PGD_MODIFIED) + arch_sync_kernel_mappings(addr, addr); +} + extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d); static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d, diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 3800479022e4..e4922b9c8403 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -75,6 +75,19 @@ DEFINE_POPULATE(pgd_populate, pgd, p4d, init) DEFINE_POPULATE(pud_populate, pud, pmd, init) DEFINE_POPULATE(pmd_populate_kernel, pmd, pte, init) +#define DEFINE_POPULATE_KERNEL(fname, type1, type2, init) \ +static inline void fname##_init(unsigned long addr, \ + type1##_t *arg1, type2##_t *arg2, bool init) \ +{ \ + if (init) \ + fname##_safe(addr, arg1, arg2); \ + else \ + fname(addr, arg1, arg2); \ +} + +DEFINE_POPULATE_KERNEL(pgd_populate_kernel, pgd, p4d, init) +DEFINE_POPULATE_KERNEL(p4d_populate_kernel, p4d, pud, init) + #define DEFINE_ENTRY(type1, type2, init) \ static inline void set_##type1##_init(type1##_t *arg1, \ type2##_t arg2, bool init) \ @@ -255,7 +268,7 @@ static p4d_t *fill_p4d(pgd_t *pgd, unsigned long vaddr) { if (pgd_none(*pgd)) { p4d_t *p4d = (p4d_t *)spp_getpage(); - pgd_populate(&init_mm, pgd, p4d); + pgd_populate_kernel(vaddr, pgd, p4d); if (p4d != p4d_offset(pgd, 0)) printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", p4d, p4d_offset(pgd, 0)); @@ -267,7 +280,7 @@ static pud_t *fill_pud(p4d_t *p4d, unsigned long vaddr) { if (p4d_none(*p4d)) { pud_t *pud = (pud_t *)spp_getpage(); - p4d_populate(&init_mm, p4d, pud); + p4d_populate_kernel(vaddr, p4d, pud); if (pud != pud_offset(p4d, 0)) printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", pud, pud_offset(p4d, 0)); @@ -720,7 +733,7 @@ phys_p4d_init(p4d_t *p4d_page, unsigned long paddr, unsigned long paddr_end, page_size_mask, prot, init); spin_lock(&init_mm.page_table_lock); - p4d_populate_init(&init_mm, p4d, pud, init); + p4d_populate_kernel_init(vaddr, p4d, pud, init); spin_unlock(&init_mm.page_table_lock); } @@ -762,10 +775,10 @@ __kernel_physical_mapping_init(unsigned long paddr_start, spin_lock(&init_mm.page_table_lock); if (pgtable_l5_enabled()) - pgd_populate_init(&init_mm, pgd, p4d, init); + pgd_populate_kernel_init(vaddr, pgd, p4d, init); else - p4d_populate_init(&init_mm, p4d_offset(pgd, vaddr), - (pud_t *) p4d, init); + p4d_populate_kernel_init(vaddr, p4d_offset(pgd, vaddr), + (pud_t *) p4d, init); spin_unlock(&init_mm.page_table_lock); pgd_changed = true; diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c index 0539efd0d216..e825952d25b2 100644 --- a/arch/x86/mm/kasan_init_64.c +++ b/arch/x86/mm/kasan_init_64.c @@ -108,7 +108,7 @@ static void __init kasan_populate_p4d(p4d_t *p4d, unsigned long addr, if (p4d_none(*p4d)) { void *p = early_alloc(PAGE_SIZE, nid, true); - p4d_populate(&init_mm, p4d, p); + p4d_populate_kernel(addr, p4d, p); } pud = pud_offset(p4d, addr); @@ -128,7 +128,7 @@ static void __init kasan_populate_pgd(pgd_t *pgd, unsigned long addr, if (pgd_none(*pgd)) { p = early_alloc(PAGE_SIZE, nid, true); - pgd_populate(&init_mm, pgd, p); + pgd_populate_kernel(addr, pgd, p); } p4d = p4d_offset(pgd, addr); @@ -255,7 +255,7 @@ static void __init kasan_shallow_populate_p4ds(pgd_t *pgd, if (p4d_none(*p4d)) { p = early_alloc(PAGE_SIZE, NUMA_NO_NODE, true); - p4d_populate(&init_mm, p4d, p); + p4d_populate_kernel(addr, p4d, p); } } while (p4d++, addr = next, addr != end); } @@ -273,7 +273,7 @@ static void __init kasan_shallow_populate_pgds(void *start, void *end) if (pgd_none(*pgd)) { p = early_alloc(PAGE_SIZE, NUMA_NO_NODE, true); - pgd_populate(&init_mm, pgd, p); + pgd_populate_kernel(addr, pgd, p); } /* -- 2.43.0

3 months, 2 weeks

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[PATCH v2 mm-hotfixes 3/5] x86/mm: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()

by Harry Yoo

Define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() to ensure page tables are properly synchronized when calling p*d_populate_kernel(). It is inteneded to synchronize page tables via pgd_pouplate_kernel() when 5-level paging is in use and via p4d_pouplate_kernel() when 4-level paging is used. This fixes intermittent boot failures on systems using 4-level paging and a large amount of persistent memory: BUG: unable to handle page fault for address: ffffe70000000034 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP NOPTI RIP: 0010:__init_single_page+0x9/0x6d Call Trace: <TASK> __init_zone_device_page+0x17/0x5d memmap_init_zone_device+0x154/0x1bb pagemap_range+0x2e0/0x40f memremap_pages+0x10b/0x2f0 devm_memremap_pages+0x1e/0x60 dev_dax_probe+0xce/0x2ec [device_dax] dax_bus_probe+0x6d/0xc9 [... snip ...] </TASK> It also fixes a crash in vmemmap_set_pmd() caused by accessing vmemmap before sync_global_pgds() [1]: BUG: unable to handle page fault for address: ffffeb3ff1200000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: Oops: 0002 [#1] PREEMPT SMP NOPTI Tainted: [W]=WARN RIP: 0010:vmemmap_set_pmd+0xff/0x230 <TASK> vmemmap_populate_hugepages+0x176/0x180 vmemmap_populate+0x34/0x80 __populate_section_memmap+0x41/0x90 sparse_add_section+0x121/0x3e0 __add_pages+0xba/0x150 add_pages+0x1d/0x70 memremap_pages+0x3dc/0x810 devm_memremap_pages+0x1c/0x60 xe_devm_add+0x8b/0x100 [xe] xe_tile_init_noalloc+0x6a/0x70 [xe] xe_device_probe+0x48c/0x740 [xe] [... snip ...] Cc: stable(a)vger.kernel.org Fixes: 8d400913c231 ("x86/vmemmap: handle unpopulated sub-pmd ranges") Closes: https://lore.kernel.org/linux-mm/20250311114420.240341-1-gwan-gyeong.mun@in… [1] Suggested-by: Dave Hansen <dave.hansen(a)linux.intel.com> Signed-off-by: Harry Yoo <harry.yoo(a)oracle.com> --- arch/x86/include/asm/pgalloc.h | 2 ++ arch/x86/mm/init_64.c | 5 +++++ 2 files changed, 7 insertions(+) diff --git a/arch/x86/include/asm/pgalloc.h b/arch/x86/include/asm/pgalloc.h index c88691b15f3c..ead834e8141a 100644 --- a/arch/x86/include/asm/pgalloc.h +++ b/arch/x86/include/asm/pgalloc.h @@ -10,6 +10,8 @@ #define __HAVE_ARCH_PTE_ALLOC_ONE #define __HAVE_ARCH_PGD_FREE +#define ARCH_PAGE_TABLE_SYNC_MASK \ + (pgtable_l5_enabled() ? PGTBL_PGD_MODIFIED : PGTBL_P4D_MODIFIED) #include <asm-generic/pgalloc.h> static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; } diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index fdb6cab524f0..3800479022e4 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -223,6 +223,11 @@ static void sync_global_pgds(unsigned long start, unsigned long end) sync_global_pgds_l4(start, end); } +void arch_sync_kernel_mappings(unsigned long start, unsigned long end) +{ + sync_global_pgds(start, end); +} + /* * NOTE: This function is marked __ref because it calls __init function * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. -- 2.43.0

3 months, 2 weeks

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[PATCH v2 mm-hotfixes 2/5] mm: introduce and use {pgd,p4d}_populate_kernel()

by Harry Yoo

Introduce and use {pgd,p4d}_populate_kernel() in core MM code when populating PGD and P4D entries for the kernel address space. These helpers ensure proper synchronization of page tables when updating the kernel portion of top-level page tables. Until now, the kernel has relied on each architecture to handle synchronization of top-level page tables in an ad-hoc manner. For example, see commit 9b861528a801 ("x86-64, mem: Update all PGDs for direct mapping and vmemmap mapping changes"). However, this approach has proven fragile for following reasons: 1) It is easy to forget to perform the necessary page table synchronization when introducing new changes. For instance, commit 4917f55b4ef9 ("mm/sparse-vmemmap: improve memory savings for compound devmaps") overlooked the need to synchronize page tables for the vmemmap area. 2) It is also easy to overlook that the vmemmap and direct mapping areas must not be accessed before explicit page table synchronization. For example, commit 8d400913c231 ("x86/vmemmap: handle unpopulated sub-pmd ranges")) caused crashes by accessing the vmemmap area before calling sync_global_pgds(). To address this, as suggested by Dave Hansen, introduce _kernel() variants of the page table population helpers, which invoke architecture-specific hooks to properly synchronize page tables. They reuse existing infrastructure for vmalloc and ioremap. Synchronization requirements are determined by ARCH_PAGE_TABLE_SYNC_MASK, and the actual synchronization is performed by arch_sync_kernel_mappings(). This change currently targets only x86_64, so only PGD and P4D level helpers are introduced. In theory, PUD and PMD level helpers can be added later if needed by other architectures. Currently this is a no-op, since no architecture sets PGTBL_{PGD,P4D}_MODIFIED in ARCH_PAGE_TABLE_SYNC_MASK. Cc: stable(a)vger.kernel.org Suggested-by: Dave Hansen <dave.hansen(a)linux.intel.com> Signed-off-by: Harry Yoo <harry.yoo(a)oracle.com> --- include/asm-generic/pgalloc.h | 18 ++++++++++++++++-- mm/kasan/init.c | 10 +++++----- mm/percpu.c | 4 ++-- mm/sparse-vmemmap.c | 4 ++-- 4 files changed, 25 insertions(+), 11 deletions(-) diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h index 7ff5d7ca4cd6..c05fea06b3fd 100644 --- a/include/asm-generic/pgalloc.h +++ b/include/asm-generic/pgalloc.h @@ -298,8 +298,8 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) /* * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values - * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings() - * needs to be called. + * and let generic vmalloc, ioremap and page table update code know when + * arch_sync_kernel_mappings() needs to be called. */ #ifndef ARCH_PAGE_TABLE_SYNC_MASK #define ARCH_PAGE_TABLE_SYNC_MASK 0 @@ -312,6 +312,20 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) */ void arch_sync_kernel_mappings(unsigned long start, unsigned long end); +#define pgd_populate_kernel(addr, pgd, p4d) \ +do { \ + pgd_populate(&init_mm, pgd, p4d); \ + if (ARCH_PAGE_TABLE_SYNC_MASK & PGTBL_PGD_MODIFIED) \ + arch_sync_kernel_mappings(addr, addr); \ +} while (0) + +#define p4d_populate_kernel(addr, p4d, pud) \ +do { \ + p4d_populate(&init_mm, p4d, pud); \ + if (ARCH_PAGE_TABLE_SYNC_MASK & PGTBL_P4D_MODIFIED) \ + arch_sync_kernel_mappings(addr, addr); \ +} while (0) + #endif /* CONFIG_MMU */ #endif /* __ASM_GENERIC_PGALLOC_H */ diff --git a/mm/kasan/init.c b/mm/kasan/init.c index ced6b29fcf76..43de820ee282 100644 --- a/mm/kasan/init.c +++ b/mm/kasan/init.c @@ -191,7 +191,7 @@ static int __ref zero_p4d_populate(pgd_t *pgd, unsigned long addr, pud_t *pud; pmd_t *pmd; - p4d_populate(&init_mm, p4d, + p4d_populate_kernel(addr, p4d, lm_alias(kasan_early_shadow_pud)); pud = pud_offset(p4d, addr); pud_populate(&init_mm, pud, @@ -212,7 +212,7 @@ static int __ref zero_p4d_populate(pgd_t *pgd, unsigned long addr, } else { p = early_alloc(PAGE_SIZE, NUMA_NO_NODE); pud_init(p); - p4d_populate(&init_mm, p4d, p); + p4d_populate_kernel(addr, p4d, p); } } zero_pud_populate(p4d, addr, next); @@ -251,10 +251,10 @@ int __ref kasan_populate_early_shadow(const void *shadow_start, * puds,pmds, so pgd_populate(), pud_populate() * is noops. */ - pgd_populate(&init_mm, pgd, + pgd_populate_kernel(addr, pgd, lm_alias(kasan_early_shadow_p4d)); p4d = p4d_offset(pgd, addr); - p4d_populate(&init_mm, p4d, + p4d_populate_kernel(addr, p4d, lm_alias(kasan_early_shadow_pud)); pud = pud_offset(p4d, addr); pud_populate(&init_mm, pud, @@ -273,7 +273,7 @@ int __ref kasan_populate_early_shadow(const void *shadow_start, if (!p) return -ENOMEM; } else { - pgd_populate(&init_mm, pgd, + pgd_populate_kernel(addr, pgd, early_alloc(PAGE_SIZE, NUMA_NO_NODE)); } } diff --git a/mm/percpu.c b/mm/percpu.c index 782cc148b39c..57450a03c432 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -3134,13 +3134,13 @@ void __init __weak pcpu_populate_pte(unsigned long addr) if (pgd_none(*pgd)) { p4d = memblock_alloc_or_panic(P4D_TABLE_SIZE, P4D_TABLE_SIZE); - pgd_populate(&init_mm, pgd, p4d); + pgd_populate_kernel(addr, pgd, p4d); } p4d = p4d_offset(pgd, addr); if (p4d_none(*p4d)) { pud = memblock_alloc_or_panic(PUD_TABLE_SIZE, PUD_TABLE_SIZE); - p4d_populate(&init_mm, p4d, pud); + p4d_populate_kernel(addr, p4d, pud); } pud = pud_offset(p4d, addr); diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index fd2ab5118e13..e275310ac708 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -229,7 +229,7 @@ p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node) if (!p) return NULL; pud_init(p); - p4d_populate(&init_mm, p4d, p); + p4d_populate_kernel(addr, p4d, p); } return p4d; } @@ -241,7 +241,7 @@ pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node) void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node); if (!p) return NULL; - pgd_populate(&init_mm, pgd, p); + pgd_populate_kernel(addr, pgd, p); } return pgd; } -- 2.43.0

3 months, 2 weeks

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[PATCH v2 mm-hotfixes 1/5] mm: move page table sync declarations to asm/pgalloc.h

by Harry Yoo

Move ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() to asm/pgalloc.h so that they can be used outside of vmalloc and ioremap. Cc: stable(a)vger.kernel.org Signed-off-by: Harry Yoo <harry.yoo(a)oracle.com> --- include/asm-generic/pgalloc.h | 16 ++++++++++++++++ include/linux/vmalloc.h | 16 ---------------- mm/vmalloc.c | 1 + 3 files changed, 17 insertions(+), 16 deletions(-) diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h index 3c8ec3bfea44..7ff5d7ca4cd6 100644 --- a/include/asm-generic/pgalloc.h +++ b/include/asm-generic/pgalloc.h @@ -296,6 +296,22 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) } #endif +/* + * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values + * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings() + * needs to be called. + */ +#ifndef ARCH_PAGE_TABLE_SYNC_MASK +#define ARCH_PAGE_TABLE_SYNC_MASK 0 +#endif + +/* + * There is no default implementation for arch_sync_kernel_mappings(). It is + * relied upon the compiler to optimize calls out if ARCH_PAGE_TABLE_SYNC_MASK + * is 0. + */ +void arch_sync_kernel_mappings(unsigned long start, unsigned long end); + #endif /* CONFIG_MMU */ #endif /* __ASM_GENERIC_PGALLOC_H */ diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index fdc9aeb74a44..2759dac6be44 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -219,22 +219,6 @@ extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, int vmap_pages_range(unsigned long addr, unsigned long end, pgprot_t prot, struct page **pages, unsigned int page_shift); -/* - * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values - * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings() - * needs to be called. - */ -#ifndef ARCH_PAGE_TABLE_SYNC_MASK -#define ARCH_PAGE_TABLE_SYNC_MASK 0 -#endif - -/* - * There is no default implementation for arch_sync_kernel_mappings(). It is - * relied upon the compiler to optimize calls out if ARCH_PAGE_TABLE_SYNC_MASK - * is 0. - */ -void arch_sync_kernel_mappings(unsigned long start, unsigned long end); - /* * Lowlevel-APIs (not for driver use!) */ diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 6dbcdceecae1..37d4a2783246 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -42,6 +42,7 @@ #include <linux/sched/mm.h> #include <asm/tlbflush.h> #include <asm/shmparam.h> +#include <asm/pgalloc.h> #include <linux/page_owner.h> #define CREATE_TRACE_POINTS -- 2.43.0

3 months, 2 weeks

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FAILED: patch "[PATCH] xhci: Disable stream for xHC controller with" failed to apply to 5.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.4-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-5.4.y git checkout FETCH_HEAD git cherry-pick -x cd65ee81240e8bc3c3119b46db7f60c80864b90b # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025070814-pebbly-diffused-9cd9@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From cd65ee81240e8bc3c3119b46db7f60c80864b90b Mon Sep 17 00:00:00 2001 From: Hongyu Xie <xiehongyu1(a)kylinos.cn> Date: Fri, 27 Jun 2025 17:41:20 +0300 Subject: [PATCH] xhci: Disable stream for xHC controller with XHCI_BROKEN_STREAMS Disable stream for platform xHC controller with broken stream. Fixes: 14aec589327a6 ("storage: accept some UAS devices if streams are unavailable") Cc: stable <stable(a)kernel.org> Signed-off-by: Hongyu Xie <xiehongyu1(a)kylinos.cn> Signed-off-by: Mathias Nyman <mathias.nyman(a)linux.intel.com> Link: https://lore.kernel.org/r/20250627144127.3889714-3-mathias.nyman@linux.inte… Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index 6dab142e7278..c79d5ed48a08 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -328,7 +328,8 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s } usb3_hcd = xhci_get_usb3_hcd(xhci); - if (usb3_hcd && HCC_MAX_PSA(xhci->hcc_params) >= 4) + if (usb3_hcd && HCC_MAX_PSA(xhci->hcc_params) >= 4 && + !(xhci->quirks & XHCI_BROKEN_STREAMS)) usb3_hcd->can_do_streams = 1; if (xhci->shared_hcd) {

3 months, 2 weeks

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FAILED: patch "[PATCH] xhci: Disable stream for xHC controller with" 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 cd65ee81240e8bc3c3119b46db7f60c80864b90b # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025070814-harmonica-eclipse-ad04@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From cd65ee81240e8bc3c3119b46db7f60c80864b90b Mon Sep 17 00:00:00 2001 From: Hongyu Xie <xiehongyu1(a)kylinos.cn> Date: Fri, 27 Jun 2025 17:41:20 +0300 Subject: [PATCH] xhci: Disable stream for xHC controller with XHCI_BROKEN_STREAMS Disable stream for platform xHC controller with broken stream. Fixes: 14aec589327a6 ("storage: accept some UAS devices if streams are unavailable") Cc: stable <stable(a)kernel.org> Signed-off-by: Hongyu Xie <xiehongyu1(a)kylinos.cn> Signed-off-by: Mathias Nyman <mathias.nyman(a)linux.intel.com> Link: https://lore.kernel.org/r/20250627144127.3889714-3-mathias.nyman@linux.inte… Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index 6dab142e7278..c79d5ed48a08 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -328,7 +328,8 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s } usb3_hcd = xhci_get_usb3_hcd(xhci); - if (usb3_hcd && HCC_MAX_PSA(xhci->hcc_params) >= 4) + if (usb3_hcd && HCC_MAX_PSA(xhci->hcc_params) >= 4 && + !(xhci->quirks & XHCI_BROKEN_STREAMS)) usb3_hcd->can_do_streams = 1; if (xhci->shared_hcd) {

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