From: Mario Limonciello mario.limonciello@amd.com

[ Upstream commit 65ea8f2c6e230bdf71fed0137cf9e9d1b307db32 ]

Generally, the C-state latency is provided by the _CST method or FADT, but some OEM platforms using AMD Picasso, Renoir, Van Gogh, and Cezanne set the C2 latency greater than C3's which causes the C2 state to be skipped.

That will block the core entering PC6, which prevents S0ix working properly on Linux systems.

In other operating systems, the latency values are not validated and this does not cause problems by skipping states.

To avoid this issue on Linux, detect when latencies are not an arithmetic progression and sort them.

Link: https://gitlab.freedesktop.org/agd5f/linux/-/commit/026d186e4592c1ee9c1cb442... Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1230#note_712174 Suggested-by: Prike Liang Prike.Liang@amd.com Suggested-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Mario Limonciello mario.limonciello@amd.com [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/processor_idle.c | 40 +++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index ed56c6d20b08..53ae679c00f0 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -16,6 +16,7 @@ #include <linux/acpi.h> #include <linux/dmi.h> #include <linux/sched.h> /* need_resched() */ +#include <linux/sort.h> #include <linux/tick.h> #include <linux/cpuidle.h> #include <linux/cpu.h> @@ -540,10 +541,37 @@ static void acpi_processor_power_verify_c3(struct acpi_processor *pr, return; }

+static int acpi_cst_latency_cmp(const void *a, const void *b) +{ + const struct acpi_processor_cx *x = a, *y = b; + + if (!(x->valid && y->valid)) + return 0; + if (x->latency > y->latency) + return 1; + if (x->latency < y->latency) + return -1; + return 0; +} +static void acpi_cst_latency_swap(void *a, void *b, int n) +{ + struct acpi_processor_cx *x = a, *y = b; + u32 tmp; + + if (!(x->valid && y->valid)) + return; + tmp = x->latency; + x->latency = y->latency; + y->latency = tmp; +} + static int acpi_processor_power_verify(struct acpi_processor *pr) { unsigned int i; unsigned int working = 0; + unsigned int last_latency = 0; + unsigned int last_type = 0; + bool buggy_latency = false;

pr->power.timer_broadcast_on_state = INT_MAX;

@@ -567,12 +595,24 @@ static int acpi_processor_power_verify(struct acpi_processor *pr) } if (!cx->valid) continue; + if (cx->type >= last_type && cx->latency < last_latency) + buggy_latency = true; + last_latency = cx->latency; + last_type = cx->type;

lapic_timer_check_state(i, pr, cx); tsc_check_state(cx->type); working++; }

+ if (buggy_latency) { + pr_notice("FW issue: working around C-state latencies out of order\n"); + sort(&pr->power.states[1], max_cstate, + sizeof(struct acpi_processor_cx), + acpi_cst_latency_cmp, + acpi_cst_latency_swap); + } + lapic_timer_propagate_broadcast(pr);

return (working);

From: Richard Fitzgerald rf@opensource.cirrus.com

[ Upstream commit 900fdc4573766dd43b847b4f54bd4a1ee2bc7360 ]

The existing code attempted to handle numbers by doing a strto[u]l(), ignoring the field width, and then repeatedly dividing to extract the field out of the full converted value. If the string contains a run of valid digits longer than will fit in a long or long long, this would overflow and no amount of dividing can recover the correct value.

This patch fixes vsscanf() to obey number field widths when parsing the number.

A new _parse_integer_limit() is added that takes a limit for the number of characters to parse. The number field conversion in vsscanf is changed to use this new function.

If a number starts with a radix prefix, the field width must be long enough for at last one digit after the prefix. If not, it will be handled like this:

sscanf("0x4", "%1i", &i): i=0, scanning continues with the 'x' sscanf("0x4", "%2i", &i): i=0, scanning continues with the '4'

This is consistent with the observed behaviour of userland sscanf.

Note that this patch does NOT fix the problem of a single field value overflowing the target type. So for example:

sscanf("123456789abcdef", "%x", &i);

Will not produce the correct result because the value obviously overflows INT_MAX. But sscanf will report a successful conversion.

Note that where a very large number is used to mean "unlimited", the value INT_MAX is used for consistency with the behaviour of vsnprintf().

Signed-off-by: Richard Fitzgerald rf@opensource.cirrus.com Reviewed-by: Petr Mladek pmladek@suse.com Signed-off-by: Petr Mladek pmladek@suse.com Link: https://lore.kernel.org/r/20210514161206.30821-2-rf@opensource.cirrus.com Signed-off-by: Sasha Levin sashal@kernel.org --- lib/kstrtox.c | 13 ++++++-- lib/kstrtox.h | 2 ++ lib/vsprintf.c | 82 +++++++++++++++++++++++++++++--------------------- 3 files changed, 60 insertions(+), 37 deletions(-)

diff --git a/lib/kstrtox.c b/lib/kstrtox.c index 1006bf70bf74..95c7234ad467 100644 --- a/lib/kstrtox.c +++ b/lib/kstrtox.c @@ -39,20 +39,22 @@ const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)

/* * Convert non-negative integer string representation in explicitly given radix - * to an integer. + * to an integer. A maximum of max_chars characters will be converted. + * * Return number of characters consumed maybe or-ed with overflow bit. * If overflow occurs, result integer (incorrect) is still returned. * * Don't you dare use this function. */ -unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p) +unsigned int _parse_integer_limit(const char *s, unsigned int base, unsigned long long *p, + size_t max_chars) { unsigned long long res; unsigned int rv;

res = 0; rv = 0; - while (1) { + while (max_chars--) { unsigned int c = *s; unsigned int lc = c | 0x20; /* don't tolower() this line */ unsigned int val; @@ -82,6 +84,11 @@ unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long return rv; }

+unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p) +{ + return _parse_integer_limit(s, base, p, INT_MAX); +} + static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res) { unsigned long long _res; diff --git a/lib/kstrtox.h b/lib/kstrtox.h index 3b4637bcd254..158c400ca865 100644 --- a/lib/kstrtox.h +++ b/lib/kstrtox.h @@ -4,6 +4,8 @@

#define KSTRTOX_OVERFLOW (1U << 31) const char *_parse_integer_fixup_radix(const char *s, unsigned int *base); +unsigned int _parse_integer_limit(const char *s, unsigned int base, unsigned long long *res, + size_t max_chars); unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *res);

#endif diff --git a/lib/vsprintf.c b/lib/vsprintf.c index fb4af73142b4..2766d1b2c301 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -50,6 +50,31 @@ #include <linux/string_helpers.h> #include "kstrtox.h"

+static unsigned long long simple_strntoull(const char *startp, size_t max_chars, + char **endp, unsigned int base) +{ + const char *cp; + unsigned long long result = 0ULL; + size_t prefix_chars; + unsigned int rv; + + cp = _parse_integer_fixup_radix(startp, &base); + prefix_chars = cp - startp; + if (prefix_chars < max_chars) { + rv = _parse_integer_limit(cp, base, &result, max_chars - prefix_chars); + /* FIXME */ + cp += (rv & ~KSTRTOX_OVERFLOW); + } else { + /* Field too short for prefix + digit, skip over without converting */ + cp = startp + max_chars; + } + + if (endp) + *endp = (char *)cp; + + return result; +} + /** * simple_strtoull - convert a string to an unsigned long long * @cp: The start of the string @@ -60,18 +85,7 @@ */ unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) { - unsigned long long result; - unsigned int rv; - - cp = _parse_integer_fixup_radix(cp, &base); - rv = _parse_integer(cp, base, &result); - /* FIXME */ - cp += (rv & ~KSTRTOX_OVERFLOW); - - if (endp) - *endp = (char *)cp; - - return result; + return simple_strntoull(cp, INT_MAX, endp, base); } EXPORT_SYMBOL(simple_strtoull);

@@ -106,6 +120,21 @@ long simple_strtol(const char *cp, char **endp, unsigned int base) } EXPORT_SYMBOL(simple_strtol);

+static long long simple_strntoll(const char *cp, size_t max_chars, char **endp, + unsigned int base) +{ + /* + * simple_strntoull() safely handles receiving max_chars==0 in the + * case cp[0] == '-' && max_chars == 1. + * If max_chars == 0 we can drop through and pass it to simple_strntoull() + * and the content of *cp is irrelevant. + */ + if (*cp == '-' && max_chars > 0) + return -simple_strntoull(cp + 1, max_chars - 1, endp, base); + + return simple_strntoull(cp, max_chars, endp, base); +} + /** * simple_strtoll - convert a string to a signed long long * @cp: The start of the string @@ -116,10 +145,7 @@ EXPORT_SYMBOL(simple_strtol); */ long long simple_strtoll(const char *cp, char **endp, unsigned int base) { - if (*cp == '-') - return -simple_strtoull(cp + 1, endp, base); - - return simple_strtoull(cp, endp, base); + return simple_strntoll(cp, INT_MAX, endp, base); } EXPORT_SYMBOL(simple_strtoll);

@@ -3343,25 +3369,13 @@ int vsscanf(const char *buf, const char *fmt, va_list args) break;

if (is_sign) - val.s = qualifier != 'L' ? - simple_strtol(str, &next, base) : - simple_strtoll(str, &next, base); + val.s = simple_strntoll(str, + field_width >= 0 ? field_width : INT_MAX, + &next, base); else - val.u = qualifier != 'L' ? - simple_strtoul(str, &next, base) : - simple_strtoull(str, &next, base); - - if (field_width > 0 && next - str > field_width) { - if (base == 0) - _parse_integer_fixup_radix(str, &base); - while (next - str > field_width) { - if (is_sign) - val.s = div_s64(val.s, base); - else - val.u = div_u64(val.u, base); - --next; - } - } + val.u = simple_strntoull(str, + field_width >= 0 ? field_width : INT_MAX, + &next, base);

switch (qualifier) { case 'H': /* that's 'hh' in format */

From: "zhangyi (F)" yi.zhang@huawei.com

[ Upstream commit 12e0613715e1cf305fffafaf0e89d810d9a85cc0 ]

block_dump is an old debugging interface, one of it's functions is used to print the information about who write which file on disk. If we enable block_dump through /proc/sys/vm/block_dump and turn on debug log level, we can gather information about write process name, target file name and disk from kernel message. This feature is realized in block_dump___mark_inode_dirty(), it print above information into kernel message directly when marking inode dirty, so it is noisy and can easily trigger log storm. At the same time, get the dentry refcount is also not safe, we found it will lead to deadlock on ext4 file system with data=journal mode.

After tracepoints has been introduced into the kernel, we got a tracepoint in __mark_inode_dirty(), which is a better replacement of block_dump___mark_inode_dirty(). The only downside is that it only trace the inode number and not a file name, but it probably doesn't matter because the original printed file name in block_dump is not accurate in some cases, and we can still find it through the inode number and device id. So this patch delete the dirting inode part of block_dump feature.

Signed-off-by: zhangyi (F) yi.zhang@huawei.com Reviewed-by: Jan Kara jack@suse.cz Reviewed-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/20210313030146.2882027-2-yi.zhang@huawei.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- fs/fs-writeback.c | 25 ------------------------- 1 file changed, 25 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index a2cf2db0d3de..fd6b50582c87 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -2196,28 +2196,6 @@ int dirtytime_interval_handler(struct ctl_table *table, int write, return ret; }

-static noinline void block_dump___mark_inode_dirty(struct inode *inode) -{ - if (inode->i_ino || strcmp(inode->i_sb->s_id, "bdev")) { - struct dentry *dentry; - const char *name = "?"; - - dentry = d_find_alias(inode); - if (dentry) { - spin_lock(&dentry->d_lock); - name = (const char *) dentry->d_name.name; - } - printk(KERN_DEBUG - "%s(%d): dirtied inode %lu (%s) on %s\n", - current->comm, task_pid_nr(current), inode->i_ino, - name, inode->i_sb->s_id); - if (dentry) { - spin_unlock(&dentry->d_lock); - dput(dentry); - } - } -} - /** * __mark_inode_dirty - internal function * @@ -2277,9 +2255,6 @@ void __mark_inode_dirty(struct inode *inode, int flags) (dirtytime && (inode->i_state & I_DIRTY_INODE))) return;

- if (unlikely(block_dump)) - block_dump___mark_inode_dirty(inode); - spin_lock(&inode->i_lock); if (dirtytime && (inode->i_state & I_DIRTY_INODE)) goto out_unlock_inode;

From: Richard Fitzgerald rf@opensource.cirrus.com

[ Upstream commit d327ea15a305024ef0085252fa3657bbb1ce25f5 ]

sparse generates the following warning:

include/linux/prandom.h:114:45: sparse: sparse: cast truncates bits from constant value

This is because the 64-bit seed value is manipulated and then placed in a u32, causing an implicit cast and truncation. A forced cast to u32 doesn't prevent this warning, which is reasonable because a typecast doesn't prove that truncation was expected.

Logical-AND the value with 0xffffffff to make explicit that truncation to 32-bit is intended.

Reported-by: kernel test robot lkp@intel.com Signed-off-by: Richard Fitzgerald rf@opensource.cirrus.com Reviewed-by: Petr Mladek pmladek@suse.com Signed-off-by: Petr Mladek pmladek@suse.com Link: https://lore.kernel.org/r/20210525122012.6336-3-rf@opensource.cirrus.com Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/prandom.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/prandom.h b/include/linux/prandom.h index cc1e71334e53..e20339c78a84 100644 --- a/include/linux/prandom.h +++ b/include/linux/prandom.h @@ -93,7 +93,7 @@ static inline u32 __seed(u32 x, u32 m) */ static inline void prandom_seed_state(struct rnd_state *state, u64 seed) { - u32 i = (seed >> 32) ^ (seed << 10) ^ seed; + u32 i = ((seed >> 32) ^ (seed << 10) ^ seed) & 0xffffffffUL;

state->s1 = __seed(i, 2U); state->s2 = __seed(i, 8U);

From: Erik Kaneda erik.kaneda@intel.com

[ Upstream commit c27bac0314131b11bccd735f7e8415ac6444b667 ]

ACPICA commit 180cb53963aa876c782a6f52cc155d951b26051a

According to the ACPI spec, _CID returns a package containing hardware ID's. Each element of an ASL package contains a reference count from the parent package as well as the element itself.

Name (TEST, Package() { "String object" // this package element has a reference count of 2 })

A memory leak was caused in the _CID repair function because it did not decrement the reference count created by the package. Fix the memory leak by calling acpi_ut_remove_reference on _CID package elements that represent a hardware ID (_HID).

Link: https://github.com/acpica/acpica/commit/180cb539 Tested-by: Shawn Guo shawn.guo@linaro.org Signed-off-by: Erik Kaneda erik.kaneda@intel.com Signed-off-by: Bob Moore robert.moore@intel.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/acpica/nsrepair2.c | 7 +++++++ 1 file changed, 7 insertions(+)

diff --git a/drivers/acpi/acpica/nsrepair2.c b/drivers/acpi/acpica/nsrepair2.c index 663d85e0adba..b7c408ce340c 100644 --- a/drivers/acpi/acpica/nsrepair2.c +++ b/drivers/acpi/acpica/nsrepair2.c @@ -375,6 +375,13 @@ acpi_ns_repair_CID(struct acpi_evaluate_info *info,

(*element_ptr)->common.reference_count = original_ref_count; + + /* + * The original_element holds a reference from the package object + * that represents _HID. Since a new element was created by _HID, + * remove the reference from the _CID package. + */ + acpi_ut_remove_reference(original_element); }

element_ptr++;

From: Hui Wang hui.wang@canonical.com

[ Upstream commit 0ec4e55e9f571f08970ed115ec0addc691eda613 ]

The laptop keyboard doesn't work on many MEDION notebooks, but the keyboard works well under Windows and Unix.

Through debugging, we found this log in the dmesg:

ACPI: IRQ 1 override to edge, high pnp 00:03: Plug and Play ACPI device, IDs PNP0303 (active)

And we checked the IRQ definition in the DSDT, it is:

IRQ (Level, ActiveLow, Exclusive, ) {1}

So the BIOS defines the keyboard IRQ to Level_Low, but the Linux kernel override it to Edge_High. If the Linux kernel is modified to skip the IRQ override, the keyboard will work normally.

From the existing comment in acpi_dev_get_irqresource(), the override

function only needs to be called when IRQ() or IRQNoFlags() is used to populate the resource descriptor, and according to Section 6.4.2.1 of ACPI 6.4 [1], if IRQ() is empty or IRQNoFlags() is used, the IRQ is High true, edge sensitive and non-shareable. ACPICA also assumes that to be the case (see acpi_rs_set_irq[] in rsirq.c).

In accordance with the above, check 3 additional conditions (EdgeSensitive, ActiveHigh and Exclusive) when deciding whether or not to treat an ACPI_RESOURCE_TYPE_IRQ resource as "legacy", in which case the IRQ override is applicable to it.

Link: https://uefi.org/specs/ACPI/6.4/06_Device_Configuration/Device_Configuration... # [1] BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=213031 BugLink: http://bugs.launchpad.net/bugs/1909814 Suggested-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Reported-by: Manuel Krause manuelkrause@netscape.net Tested-by: Manuel Krause manuelkrause@netscape.net Signed-off-by: Hui Wang hui.wang@canonical.com [ rjw: Subject rewrite, changelog edits ] Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/resource.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c index 48ca9a844f06..55c57b703ea3 100644 --- a/drivers/acpi/resource.c +++ b/drivers/acpi/resource.c @@ -430,6 +430,13 @@ static void acpi_dev_get_irqresource(struct resource *res, u32 gsi, } }

+static bool irq_is_legacy(struct acpi_resource_irq *irq) +{ + return irq->triggering == ACPI_EDGE_SENSITIVE && + irq->polarity == ACPI_ACTIVE_HIGH && + irq->shareable == ACPI_EXCLUSIVE; +} + /** * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information. * @ares: Input ACPI resource object. @@ -468,7 +475,7 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index, } acpi_dev_get_irqresource(res, irq->interrupts[index], irq->triggering, irq->polarity, - irq->shareable, true); + irq->shareable, irq_is_legacy(irq)); break; case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: ext_irq = &ares->data.extended_irq;

From: Jiapeng Chong jiapeng.chong@linux.alibaba.com

[ Upstream commit 28e367127718a9cb85d615a71e152f7acee41bfc ]

The error code is missing in this code scenario, add the error code '-EINVAL' to the return value 'error'.

Eliminate the follow smatch warning:

drivers/platform/x86/toshiba_acpi.c:2834 toshiba_acpi_setup_keyboard() warn: missing error code 'error'.

Reported-by: Abaci Robot abaci@linux.alibaba.com Signed-off-by: Jiapeng Chong jiapeng.chong@linux.alibaba.com Link: https://lore.kernel.org/r/1622628348-87035-1-git-send-email-jiapeng.chong@li... Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/platform/x86/toshiba_acpi.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c index 71a969fc3b20..f202fc0dd1ff 100644 --- a/drivers/platform/x86/toshiba_acpi.c +++ b/drivers/platform/x86/toshiba_acpi.c @@ -2841,6 +2841,7 @@ static int toshiba_acpi_setup_keyboard(struct toshiba_acpi_dev *dev)

if (!dev->info_supported && !dev->system_event_supported) { pr_warn("No hotkey query interface found\n"); + error = -EINVAL; goto err_remove_filter; }

From: "Luck, Tony" tony.luck@intel.com

[ Upstream commit f0a029fff4a50eb01648810a77ba1873e829fdd4 ]

There's little to no point in loading an EDAC driver running in a guest: 1) The CPU model reported by CPUID may not represent actual h/w 2) The hypervisor likely does not pass in access to memory controller devices 3) Hypervisors generally do not pass corrected error details to guests

Add a check in each of the Intel EDAC drivers for X86_FEATURE_HYPERVISOR and simply return -ENODEV in the init routine.

Acked-by: Borislav Petkov bp@suse.de Signed-off-by: Tony Luck tony.luck@intel.com Link: https://lore.kernel.org/r/20210615174419.GA1087688@agluck-desk2.amr.corp.int... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/edac/i10nm_base.c | 3 +++ drivers/edac/pnd2_edac.c | 3 +++ drivers/edac/sb_edac.c | 3 +++ drivers/edac/skx_base.c | 3 +++ 4 files changed, 12 insertions(+)

diff --git a/drivers/edac/i10nm_base.c b/drivers/edac/i10nm_base.c index dfcde7ed9500..f72be5f94e6f 100644 --- a/drivers/edac/i10nm_base.c +++ b/drivers/edac/i10nm_base.c @@ -249,6 +249,9 @@ static int __init i10nm_init(void) if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR))) return -EBUSY;

+ if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) + return -ENODEV; + id = x86_match_cpu(i10nm_cpuids); if (!id) return -ENODEV; diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c index dac45e2071b3..e054eb038903 100644 --- a/drivers/edac/pnd2_edac.c +++ b/drivers/edac/pnd2_edac.c @@ -1555,6 +1555,9 @@ static int __init pnd2_init(void) if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR))) return -EBUSY;

+ if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) + return -ENODEV; + id = x86_match_cpu(pnd2_cpuids); if (!id) return -ENODEV; diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c index b557a53c75c4..d39f5bfb8bd9 100644 --- a/drivers/edac/sb_edac.c +++ b/drivers/edac/sb_edac.c @@ -3512,6 +3512,9 @@ static int __init sbridge_init(void) if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR))) return -EBUSY;

+ if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) + return -ENODEV; + id = x86_match_cpu(sbridge_cpuids); if (!id) return -ENODEV; diff --git a/drivers/edac/skx_base.c b/drivers/edac/skx_base.c index 77cd370bd62f..b1d717cb8df9 100644 --- a/drivers/edac/skx_base.c +++ b/drivers/edac/skx_base.c @@ -605,6 +605,9 @@ static int __init skx_init(void) if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR))) return -EBUSY;

+ if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) + return -ENODEV; + id = x86_match_cpu(skx_cpuids); if (!id) return -ENODEV;

From: "Paul E. McKenney" paulmck@kernel.org

[ Upstream commit db3a34e17433de2390eb80d436970edcebd0ca3e ]

When the clocksource watchdog marks a clock as unstable, this might be due to that clock being unstable or it might be due to delays that happen to occur between the reads of the two clocks. Yes, interrupts are disabled across those two reads, but there are no shortage of things that can delay interrupts-disabled regions of code ranging from SMI handlers to vCPU preemption. It would be good to have some indication as to why the clock was marked unstable.

Therefore, re-read the watchdog clock on either side of the read from the clock under test. If the watchdog clock shows an excessive time delta between its pair of reads, the reads are retried.

The maximum number of retries is specified by a new kernel boot parameter clocksource.max_cswd_read_retries, which defaults to three, that is, up to four reads, one initial and up to three retries. If more than one retry was required, a message is printed on the console (the occasional single retry is expected behavior, especially in guest OSes). If the maximum number of retries is exceeded, the clock under test will be marked unstable. However, the probability of this happening due to various sorts of delays is quite small. In addition, the reason (clock-read delays) for the unstable marking will be apparent.

Reported-by: Chris Mason clm@fb.com Signed-off-by: Paul E. McKenney paulmck@kernel.org Signed-off-by: Thomas Gleixner tglx@linutronix.de Acked-by: Feng Tang feng.tang@intel.com Link: https://lore.kernel.org/r/20210527190124.440372-1-paulmck@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- .../admin-guide/kernel-parameters.txt | 6 +++ kernel/time/clocksource.c | 53 ++++++++++++++++--- 2 files changed, 53 insertions(+), 6 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a19ae163c058..dbb68067ba4e 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -567,6 +567,12 @@ loops can be debugged more effectively on production systems.

+ clocksource.max_cswd_read_retries= [KNL] + Number of clocksource_watchdog() retries due to + external delays before the clock will be marked + unstable. Defaults to three retries, that is, + four attempts to read the clock under test. + clearcpuid=BITNUM[,BITNUM...] [X86] Disable CPUID feature X for the kernel. See arch/x86/include/asm/cpufeatures.h for the valid bit diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index 428beb69426a..6863a054c970 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -124,6 +124,13 @@ static void __clocksource_change_rating(struct clocksource *cs, int rating); #define WATCHDOG_INTERVAL (HZ >> 1) #define WATCHDOG_THRESHOLD (NSEC_PER_SEC >> 4)

+/* + * Maximum permissible delay between two readouts of the watchdog + * clocksource surrounding a read of the clocksource being validated. + * This delay could be due to SMIs, NMIs, or to VCPU preemptions. + */ +#define WATCHDOG_MAX_SKEW (100 * NSEC_PER_USEC) + static void clocksource_watchdog_work(struct work_struct *work) { /* @@ -184,12 +191,45 @@ void clocksource_mark_unstable(struct clocksource *cs) spin_unlock_irqrestore(&watchdog_lock, flags); }

+static ulong max_cswd_read_retries = 3; +module_param(max_cswd_read_retries, ulong, 0644); + +static bool cs_watchdog_read(struct clocksource *cs, u64 *csnow, u64 *wdnow) +{ + unsigned int nretries; + u64 wd_end, wd_delta; + int64_t wd_delay; + + for (nretries = 0; nretries <= max_cswd_read_retries; nretries++) { + local_irq_disable(); + *wdnow = watchdog->read(watchdog); + *csnow = cs->read(cs); + wd_end = watchdog->read(watchdog); + local_irq_enable(); + + wd_delta = clocksource_delta(wd_end, *wdnow, watchdog->mask); + wd_delay = clocksource_cyc2ns(wd_delta, watchdog->mult, + watchdog->shift); + if (wd_delay <= WATCHDOG_MAX_SKEW) { + if (nretries > 1 || nretries >= max_cswd_read_retries) { + pr_warn("timekeeping watchdog on CPU%d: %s retried %d times before success\n", + smp_processor_id(), watchdog->name, nretries); + } + return true; + } + } + + pr_warn("timekeeping watchdog on CPU%d: %s read-back delay of %lldns, attempt %d, marking unstable\n", + smp_processor_id(), watchdog->name, wd_delay, nretries); + return false; +} + static void clocksource_watchdog(struct timer_list *unused) { - struct clocksource *cs; u64 csnow, wdnow, cslast, wdlast, delta; - int64_t wd_nsec, cs_nsec; int next_cpu, reset_pending; + int64_t wd_nsec, cs_nsec; + struct clocksource *cs;

spin_lock(&watchdog_lock); if (!watchdog_running) @@ -206,10 +246,11 @@ static void clocksource_watchdog(struct timer_list *unused) continue; }

- local_irq_disable(); - csnow = cs->read(cs); - wdnow = watchdog->read(watchdog); - local_irq_enable(); + if (!cs_watchdog_read(cs, &csnow, &wdnow)) { + /* Clock readout unreliable, so give it up. */ + __clocksource_unstable(cs); + continue; + }

/* Clocksource initialized ? */ if (!(cs->flags & CLOCK_SOURCE_WATCHDOG) ||

From: Jason Gerecke killertofu@gmail.com

[ Upstream commit 424d8237945c6c448c8b3f23885d464fb5685c97 ]

The capacitive status of ExpressKeys is reported with usages beginning at 0x940, not 0x950. Bring our driver into alignment with reality.

Signed-off-by: Jason Gerecke jason.gerecke@wacom.com Signed-off-by: Jiri Kosina jkosina@suse.cz Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hid/wacom_wac.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/wacom_wac.h b/drivers/hid/wacom_wac.h index 195910dd2154..e3835407e8d2 100644 --- a/drivers/hid/wacom_wac.h +++ b/drivers/hid/wacom_wac.h @@ -122,7 +122,7 @@ #define WACOM_HID_WD_TOUCHONOFF (WACOM_HID_UP_WACOMDIGITIZER | 0x0454) #define WACOM_HID_WD_BATTERY_LEVEL (WACOM_HID_UP_WACOMDIGITIZER | 0x043b) #define WACOM_HID_WD_EXPRESSKEY00 (WACOM_HID_UP_WACOMDIGITIZER | 0x0910) -#define WACOM_HID_WD_EXPRESSKEYCAP00 (WACOM_HID_UP_WACOMDIGITIZER | 0x0950) +#define WACOM_HID_WD_EXPRESSKEYCAP00 (WACOM_HID_UP_WACOMDIGITIZER | 0x0940) #define WACOM_HID_WD_MODE_CHANGE (WACOM_HID_UP_WACOMDIGITIZER | 0x0980) #define WACOM_HID_WD_MUTE_DEVICE (WACOM_HID_UP_WACOMDIGITIZER | 0x0981) #define WACOM_HID_WD_CONTROLPANEL (WACOM_HID_UP_WACOMDIGITIZER | 0x0982)

From: Ming Lei ming.lei@redhat.com

[ Upstream commit 2705dfb2094777e405e065105e307074af8965c1 ]

ll_new_hw_segment() is reached only in case of single range discard merge, and we don't have max discard segment size limit actually, so it is wrong to run the following check:

if (req->nr_phys_segments + nr_phys_segs > blk_rq_get_max_segments(req))

it may be always false since req->nr_phys_segments is initialized as one, and bio's segment count is still 1, blk_rq_get_max_segments(reg) is 1 too.

Fix the issue by not doing the check and bypassing the calculation of discard request's nr_phys_segments.

Based on analysis from Wang Shanker.

Cc: Christoph Hellwig hch@lst.de Reported-by: Wang Shanker shankerwangmiao@gmail.com Signed-off-by: Ming Lei ming.lei@redhat.com Link: https://lore.kernel.org/r/20210628023312.1903255-1-ming.lei@redhat.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- block/blk-merge.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/block/blk-merge.c b/block/blk-merge.c index 03959bfe961c..4b022f0c49d2 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -571,10 +571,14 @@ static inline unsigned int blk_rq_get_max_segments(struct request *rq) static inline int ll_new_hw_segment(struct request *req, struct bio *bio, unsigned int nr_phys_segs) { - if (req->nr_phys_segments + nr_phys_segs > blk_rq_get_max_segments(req)) + if (blk_integrity_merge_bio(req->q, req, bio) == false) goto no_merge;

- if (blk_integrity_merge_bio(req->q, req, bio) == false) + /* discard request merge won't add new segment */ + if (req_op(req) == REQ_OP_DISCARD) + return 1; + + if (req->nr_phys_segments + nr_phys_segs > blk_rq_get_max_segments(req)) goto no_merge;

/*

From: Arnd Bergmann arnd@arndb.de

[ Upstream commit c5f320ff8a79501bb59338278336ec43acb9d7e2 ]

gcc points out a mistake in the mca driver that goes back to before the git history:

arch/ia64/kernel/mca_drv.c: In function 'init_record_index_pools': arch/ia64/kernel/mca_drv.c:346:54: error: expression does not compute the number of elements in this array; element typ e is 'int', not 'size_t' {aka 'long unsigned int'} [-Werror=sizeof-array-div] 346 | for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++) | ^

This is the same as sizeof(size_t), which is two shorter than the actual array. Use the ARRAY_SIZE() macro to get the correct calculation instead.

Link: https://lkml.kernel.org/r/20210514214123.875971-1-arnd@kernel.org Signed-off-by: Arnd Bergmann arnd@arndb.de Cc: Masahiro Yamada masahiroy@kernel.org Cc: Randy Dunlap rdunlap@infradead.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/ia64/kernel/mca_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/ia64/kernel/mca_drv.c b/arch/ia64/kernel/mca_drv.c index 4d0ab323dee8..2a40268c3d49 100644 --- a/arch/ia64/kernel/mca_drv.c +++ b/arch/ia64/kernel/mca_drv.c @@ -343,7 +343,7 @@ init_record_index_pools(void)

/* - 2 - */ sect_min_size = sal_log_sect_min_sizes[0]; - for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++) + for (i = 1; i < ARRAY_SIZE(sal_log_sect_min_sizes); i++) if (sect_min_size > sal_log_sect_min_sizes[i]) sect_min_size = sal_log_sect_min_sizes[i];