| Age | Commit message (Collapse) | Author |
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Fix the clock reference counting by calling the missing clk_put() in the
error path.
Cc: v5.10 <stable@vger.kernel.org> # v5.10
Fixes: dd461cd9183f ("opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE_DEFER")
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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In function _allocate_opp_table, opp_dev is allocated and referenced
by opp_table via _add_opp_dev. But in the case that the subsequent calls
return -EPROBE_DEFER, it will jump to err label and opp_table will be
freed. Then opp_dev becomes an unreferenced object to cause memory leak.
So let's call _remove_opp_dev to do the cleanup.
This fixes the following kmemleak report:
unreferenced object 0xffff000801524a00 (size 128):
comm "swapper/0", pid 1, jiffies 4294892465 (age 84.616s)
hex dump (first 32 bytes):
40 00 56 01 08 00 ff ff 40 00 56 01 08 00 ff ff @.V.....@.V.....
b8 52 77 7f 08 00 ff ff 00 3c 4c 00 08 00 ff ff .Rw......<L.....
backtrace:
[<00000000b1289fb1>] kmemleak_alloc+0x30/0x40
[<0000000056da48f0>] kmem_cache_alloc+0x3d4/0x588
[<00000000a84b3b0e>] _add_opp_dev+0x2c/0x88
[<0000000062a380cd>] _add_opp_table_indexed+0x124/0x268
[<000000008b4c8f1f>] dev_pm_opp_of_add_table+0x20/0x1d8
[<00000000e5316798>] dev_pm_opp_of_cpumask_add_table+0x48/0xf0
[<00000000db0a8ec2>] dt_cpufreq_probe+0x20c/0x448
[<0000000030a3a26c>] platform_probe+0x68/0xd8
[<00000000c618e78d>] really_probe+0xd0/0x3a0
[<00000000642e856f>] driver_probe_device+0x58/0xb8
[<00000000f10f5307>] device_driver_attach+0x74/0x80
[<0000000004f254b8>] __driver_attach+0x58/0xe0
[<0000000009d5d19e>] bus_for_each_dev+0x70/0xc8
[<0000000000d22e1c>] driver_attach+0x24/0x30
[<0000000001d4e952>] bus_add_driver+0x14c/0x1f0
[<0000000089928aaa>] driver_register+0x64/0x120
Cc: v5.10 <stable@vger.kernel.org> # v5.10
Fixes: dd461cd9183f ("opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE_DEFER")
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
[ Viresh: Added the stable tag ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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This allows the callers to drop the unnecessary checks.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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It has been found that some users (like cpufreq-dt and others on LKML)
have abused the helper dev_pm_opp_get_opp_table() to create the OPP
table instead of just finding it, which is the wrong thing to do. This
routine was meant for OPP core's internal working and exposed the whole
functionality by mistake.
Change the scope of dev_pm_opp_get_opp_table() to only finding the
table. The internal helpers _opp_get_opp_table*() are thus renamed to
_add_opp_table*(), dev_pm_opp_get_opp_table_indexed() is removed (as we
don't need the index field for finding the OPP table) and so the only
user, genpd, is updated.
Note that the prototype of _add_opp_table() was already left in opp.h by
mistake when it was removed earlier and so we weren't required to add it
now.
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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There is a lot of stuff here which can be done outside of the
opp_table->lock, do that. This helps avoiding a circular dependency
lockdeps around debugfs.
Reported-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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The caller of _find_opp_dev() only needs to know if the opp_dev is there
in the list or not.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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There is no critical section which needs protection with locks while
allocating an OPP table, except while adding it to the opp_tables list.
And taking the opp_table_lock for the entire duration causes circular
dependency issues like the one mentioned below. This patch takes
another approach to reduce the size of the critical section to avoid
such issues, the details of that are present within the patch.
======================================================
WARNING: possible circular locking dependency detected
5.4.72 #14 Not tainted
------------------------------------------------------
chrome/1865 is trying to acquire lock:
ffffffdd34921750 (opp_table_lock){+.+.}, at: _find_opp_table+0x34/0x74
but task is already holding lock:
ffffff81f0fc71a8 (reservation_ww_class_mutex){+.+.}, at: submit_lock_objects+0x70/0x1ec
fscrypt: AES-256-CTS-CBC using implementation "cts-cbc-aes-ce"
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (reservation_ww_class_mutex){+.+.}:
__mutex_lock_common+0xec/0xc0c
ww_mutex_lock_interruptible+0x5c/0xc4
msm_gem_fault+0x2c/0x124
__do_fault+0x40/0x16c
handle_mm_fault+0x7cc/0xd98
do_page_fault+0x230/0x3b4
do_translation_fault+0x5c/0x78
do_mem_abort+0x4c/0xb4
el0_da+0x1c/0x20
-> #3 (&mm->mmap_sem){++++}:
__might_fault+0x70/0x98
compat_filldir+0xf8/0x48c
dcache_readdir+0x70/0x1dc
iterate_dir+0xd4/0x180
__arm64_compat_sys_getdents+0xa0/0x19c
el0_svc_common+0xa8/0x178
el0_svc_compat_handler+0x2c/0x40
el0_svc_compat+0x8/0x10
-> #2 (&sb->s_type->i_mutex_key#3){++++}:
down_write+0x54/0x16c
start_creating+0x68/0x128
debugfs_create_dir+0x28/0x114
opp_debug_register+0x8c/0xc0
_add_opp_dev_unlocked+0x5c/0x70
_add_opp_dev+0x38/0x58
_opp_get_opp_table+0xdc/0x1ac
dev_pm_opp_get_opp_table_indexed+0x24/0x30
dev_pm_opp_of_add_table_indexed+0x48/0x84
of_genpd_add_provider_onecell+0xc0/0x1b8
rpmhpd_probe+0x240/0x268
platform_drv_probe+0x90/0xb0
really_probe+0x134/0x2ec
driver_probe_device+0x64/0xfc
__device_attach_driver+0x8c/0xa4
bus_for_each_drv+0x90/0xd8
__device_attach+0xc0/0x148
device_initial_probe+0x20/0x2c
bus_probe_device+0x34/0x94
device_add+0x1fc/0x3b0
of_device_add+0x3c/0x4c
of_platform_device_create_pdata+0xb8/0xfc
of_platform_bus_create+0x1e4/0x368
of_platform_populate+0x70/0xbc
devm_of_platform_populate+0x58/0xa0
rpmh_rsc_probe+0x36c/0x3cc
platform_drv_probe+0x90/0xb0
really_probe+0x134/0x2ec
driver_probe_device+0x64/0xfc
__device_attach_driver+0x8c/0xa4
bus_for_each_drv+0x90/0xd8
__device_attach+0xc0/0x148
device_initial_probe+0x20/0x2c
bus_probe_device+0x34/0x94
device_add+0x1fc/0x3b0
of_device_add+0x3c/0x4c
of_platform_device_create_pdata+0xb8/0xfc
of_platform_bus_create+0x1e4/0x368
of_platform_bus_create+0x230/0x368
of_platform_populate+0x70/0xbc
of_platform_default_populate_init+0xa8/0xc0
do_one_initcall+0x1c8/0x3fc
do_initcall_level+0xb4/0x10c
do_basic_setup+0x30/0x48
kernel_init_freeable+0x124/0x1a4
kernel_init+0x14/0x104
ret_from_fork+0x10/0x18
-> #1 (&opp_table->lock){+.+.}:
__mutex_lock_common+0xec/0xc0c
mutex_lock_nested+0x40/0x50
_add_opp_dev+0x2c/0x58
_opp_get_opp_table+0xdc/0x1ac
dev_pm_opp_get_opp_table_indexed+0x24/0x30
dev_pm_opp_of_add_table_indexed+0x48/0x84
of_genpd_add_provider_onecell+0xc0/0x1b8
rpmhpd_probe+0x240/0x268
platform_drv_probe+0x90/0xb0
really_probe+0x134/0x2ec
driver_probe_device+0x64/0xfc
__device_attach_driver+0x8c/0xa4
bus_for_each_drv+0x90/0xd8
__device_attach+0xc0/0x148
device_initial_probe+0x20/0x2c
bus_probe_device+0x34/0x94
device_add+0x1fc/0x3b0
of_device_add+0x3c/0x4c
of_platform_device_create_pdata+0xb8/0xfc
of_platform_bus_create+0x1e4/0x368
of_platform_populate+0x70/0xbc
devm_of_platform_populate+0x58/0xa0
rpmh_rsc_probe+0x36c/0x3cc
platform_drv_probe+0x90/0xb0
really_probe+0x134/0x2ec
driver_probe_device+0x64/0xfc
__device_attach_driver+0x8c/0xa4
bus_for_each_drv+0x90/0xd8
__device_attach+0xc0/0x148
device_initial_probe+0x20/0x2c
bus_probe_device+0x34/0x94
device_add+0x1fc/0x3b0
of_device_add+0x3c/0x4c
of_platform_device_create_pdata+0xb8/0xfc
of_platform_bus_create+0x1e4/0x368
of_platform_populate+0x70/0xbc
devm_of_platform_populate+0x58/0xa0
rpmh_rsc_probe+0x36c/0x3cc
platform_drv_probe+0x90/0xb0
really_probe+0x134/0x2ec
driver_probe_device+0x64/0xfc
__device_attach_driver+0x8c/0xa4
bus_for_each_drv+0x90/0xd8
__device_attach+0xc0/0x148
device_initial_probe+0x20/0x2c
bus_probe_device+0x34/0x94
device_add+0x1fc/0x3b0
of_device_add+0x3c/0x4c
of_platform_device_create_pdata+0xb8/0xfc
of_platform_bus_create+0x1e4/0x368
of_platform_bus_create+0x230/0x368
of_platform_populate+0x70/0xbc
of_platform_default_populate_init+0xa8/0xc0
do_one_initcall+0x1c8/0x3fc
do_initcall_level+0xb4/0x10c
do_basic_setup+0x30/0x48
kernel_init_freeable+0x124/0x1a4
kernel_init+0x14/0x104
ret_from_fork+0x10/0x18
-> #0 (opp_table_lock){+.+.}:
__lock_acquire+0xee4/0x2450
lock_acquire+0x1cc/0x210
__mutex_lock_common+0xec/0xc0c
mutex_lock_nested+0x40/0x50
_find_opp_table+0x34/0x74
dev_pm_opp_find_freq_exact+0x2c/0xdc
a6xx_gmu_resume+0xc8/0xecc
a6xx_pm_resume+0x148/0x200
adreno_resume+0x28/0x34
pm_generic_runtime_resume+0x34/0x48
__rpm_callback+0x70/0x10c
rpm_callback+0x34/0x8c
rpm_resume+0x414/0x550
__pm_runtime_resume+0x7c/0xa0
msm_gpu_submit+0x60/0x1c0
msm_ioctl_gem_submit+0xadc/0xb60
drm_ioctl_kernel+0x9c/0x118
drm_ioctl+0x27c/0x408
drm_compat_ioctl+0xcc/0xdc
__se_compat_sys_ioctl+0x100/0x206c
__arm64_compat_sys_ioctl+0x20/0x2c
el0_svc_common+0xa8/0x178
el0_svc_compat_handler+0x2c/0x40
el0_svc_compat+0x8/0x10
other info that might help us debug this:
Chain exists of: opp_table_lock --> &mm->mmap_sem --> reservation_ww_class_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(reservation_ww_class_mutex);
lock(&mm->mmap_sem);
lock(reservation_ww_class_mutex);
lock(opp_table_lock);
*** DEADLOCK ***
3 locks held by chrome/1865:
#0: ffffff81edecc0d8 (&dev->struct_mutex){+.+.}, at: msm_ioctl_gem_submit+0x264/0xb60
#1: ffffff81d0000870 (reservation_ww_class_acquire){+.+.}, at: msm_ioctl_gem_submit+0x8e8/0xb60
#2: ffffff81f0fc71a8 (reservation_ww_class_mutex){+.+.}, at: submit_lock_objects+0x70/0x1ec
stack backtrace:
CPU: 0 PID: 1865 Comm: chrome Not tainted 5.4.72 #14
Hardware name: Google Lazor (rev1+) with LTE (DT)
Call trace:
dump_backtrace+0x0/0x158
show_stack+0x20/0x2c
dump_stack+0xc8/0x160
print_circular_bug+0x2c4/0x2c8
check_noncircular+0x1a8/0x1b0
__lock_acquire+0xee4/0x2450
lock_acquire+0x1cc/0x210
__mutex_lock_common+0xec/0xc0c
mutex_lock_nested+0x40/0x50
_find_opp_table+0x34/0x74
dev_pm_opp_find_freq_exact+0x2c/0xdc
a6xx_gmu_resume+0xc8/0xecc
a6xx_pm_resume+0x148/0x200
adreno_resume+0x28/0x34
pm_generic_runtime_resume+0x34/0x48
__rpm_callback+0x70/0x10c
rpm_callback+0x34/0x8c
rpm_resume+0x414/0x550
__pm_runtime_resume+0x7c/0xa0
msm_gpu_submit+0x60/0x1c0
msm_ioctl_gem_submit+0xadc/0xb60
drm_ioctl_kernel+0x9c/0x118
drm_ioctl+0x27c/0x408
drm_compat_ioctl+0xcc/0xdc
__se_compat_sys_ioctl+0x100/0x206c
__arm64_compat_sys_ioctl+0x20/0x2c
el0_svc_common+0xa8/0x178
el0_svc_compat_handler+0x2c/0x40
el0_svc_compat+0x8/0x10
Reported-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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The readers of dev_list expect the updates to it to take place from
within the opp_table->lock and this is missing in the case where the
dev_list is updated for already managed OPPs.
Fix that by calling _add_opp_dev() from there and remove the now unused
_add_opp_dev_unlocked() callback. While at it, also reduce the length of
the critical section in _add_opp_dev().
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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There is a lot of stuff here which can be done outside of the big
opp_table_lock, do that. This helps avoiding few circular dependency
lockdeps around debugfs and interconnects.
Reported-by: Rob Clark <robdclark@gmail.com>
Reported-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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We returned earlier by mistake even when there were no failures. Fix it.
Fixes: dd461cd9183f ("opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE_DEFER")
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm
Pull opertaing performance points (OPP) framework fixes for 5.10-rc1
from Viresh Kumar:
"- Return -EPROBE_DEFER properly from dev_pm_opp_get_opp_table()
(Stephan Gerhold).
- Minor cleanups around required-opps (Stephan Gerhold).
- Extends opp-supported-hw property to contain multiple versions
(Viresh Kumar).
- Multiple cleanups around dev_pm_opp_attach_genpd() (Viresh Kumar).
- Multiple fixes, cleanups in the OPP core for overall better design
(Viresh Kumar)."
* 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
opp: Allow opp-level to be set to 0
opp: Prevent memory leak in dev_pm_opp_attach_genpd()
ARM: tegra: Pass multiple versions in opp-supported-hw property
opp: Allow opp-supported-hw to contain multiple versions
dt-bindings: opp: Allow opp-supported-hw to contain multiple versions
opp: Set required OPPs in reverse order when scaling down
opp: Reduce code duplication in _set_required_opps()
opp: Drop unnecessary check from dev_pm_opp_attach_genpd()
opp: Handle multiple calls for same OPP table in _of_add_opp_table_v1()
opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE_DEFER
opp: Remove _dev_pm_opp_find_and_remove_table() wrapper
opp: Split out _opp_set_rate_zero()
opp: Reuse the enabled flag in !target_freq path
opp: Rename regulator_enabled and use it as status of all resources
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The DT bindings don't put such a constraint, nor should the kernel. It
is perfectly fine for opp-level to be set to 0, if we need to put the
performance state votes for a domain for a particular OPP.
Reported-by: Stephan Gerhold <stephan@gerhold.net>
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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If dev_pm_opp_attach_genpd() is called multiple times (once for each CPU
sharing the table), then it would result in unwanted behavior like
memory leak, attaching the domain multiple times, etc.
Handle that by checking and returning earlier if the domains are already
attached. Now that dev_pm_opp_detach_genpd() can get called multiple
times as well, we need to protect that too.
Note that the virtual device pointers aren't returned in this case, as
they may become unavailable to some callers during the middle of the
operation.
Reported-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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The OPP core already has well-defined semantics to ensure required
OPPs/regulators are set before/after the frequency change, depending
on if we scale up or down.
Similar requirements might exist for the order of required OPPs
when multiple power domains need to be scaled for a frequency change.
For example, on Qualcomm platforms using CPR (Core Power Reduction),
we need to scale the VDDMX and CPR power domain. When scaling up,
MX should be scaled up before CPR. When scaling down, CPR should be
scaled down before MX.
In general, if there are multiple "required-opps" in the device tree
I would expect that the order is either irrelevant, or there is some
dependency between the power domains. In that case, the power domains
should be scaled down in reverse order.
This commit updates _set_required_opps() to set required OPPs in
reverse order when scaling down.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
[ Viresh: Fix rebase conflict and minor rearrangement of the code ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Move call to dev_pm_genpd_set_performance_state() to a separate
function so we can avoid duplicating the code for the single and
multiple genpd case.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
[ Viresh: Validate virtual device before use ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Since commit c0ab9e0812da ("opp: Allocate genpd_virt_devs from
dev_pm_opp_attach_genpd()"), the allocation of the virtual devices is
moved to dev_pm_opp_attach_genpd() and this check isn't required anymore
as it will always fail. Drop it.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm
Pull operating performance points (OPP) framework fixes for 5.9-rc4 from
Viresh Kumar:
"This fixes reference counting for OPP tables. Few patches are getting
queued (for various subsystems) for 5.10 which depend on this to be
fixed first."
* 'opp/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
opp: Don't drop reference for an OPP table that was never parsed
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dev_pm_opp_remove_table() should drop a reference to the OPP table only
if the DT OPP table was parsed earlier with a call to
dev_pm_opp_of_add_table() earlier. Else it may end up dropping the
reference to the OPP table, which was added as a result of other calls
like dev_pm_opp_set_clkname(). And would hence result in undesirable
behavior later on when caller would try to free the resource again.
Fixes: 03758d60265c ("opp: Replace list_kref with a local counter")
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Reported-by: Anders Roxell <anders.roxell@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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The OPP core manages various resources, e.g. clocks or interconnect paths.
These resources are looked up when the OPP table is allocated once
dev_pm_opp_get_opp_table() is called the first time (either directly
or indirectly through one of the many helper functions).
At this point, the resources may not be available yet, i.e. looking them
up will result in -EPROBE_DEFER. Unfortunately, dev_pm_opp_get_opp_table()
is currently unable to propagate this error code since it only returns
the allocated OPP table or NULL.
This means that all consumers of the OPP core are required to make sure
that all necessary resources are available. Usually this happens by
requesting them, checking the result and releasing them immediately after.
For example, we have added "dev_pm_opp_of_find_icc_paths(dev, NULL)" to
several drivers now just to make sure the interconnect providers are
ready before the OPP table is allocated. If this call is missing,
the OPP core will only warn about this and then attempt to continue
without interconnect. This will eventually fail horribly, e.g.:
cpu cpu0: _allocate_opp_table: Error finding interconnect paths: -517
... later ...
of: _read_bw: Mismatch between opp-peak-kBps and paths (1 0)
cpu cpu0: _opp_add_static_v2: opp key field not found
cpu cpu0: _of_add_opp_table_v2: Failed to add OPP, -22
This example happens when trying to use interconnects for a CPU OPP
table together with qcom-cpufreq-nvmem.c. qcom-cpufreq-nvmem calls
dev_pm_opp_set_supported_hw(), which ends up allocating the OPP table
early. To fix the problem with the current approach we would need to add
yet another call to dev_pm_opp_of_find_icc_paths(dev, NULL).
But actually qcom-cpufreq-nvmem.c has nothing to do with interconnects...
This commit attempts to make this more robust by allowing
dev_pm_opp_get_opp_table() to return an error pointer. Fixing all
the usages is trivial because the function is usually used indirectly
through another helper (e.g. dev_pm_opp_set_supported_hw() above).
These other helpers already return an error pointer.
The example above then works correctly because set_supported_hw() will
return -EPROBE_DEFER, and qcom-cpufreq-nvmem.c already propagates that
error. It should also be possible to remove the remaining usages of
"dev_pm_opp_of_find_icc_paths(dev, NULL)" from other drivers as well.
Note that this commit currently only handles -EPROBE_DEFER for the
clock/interconnects within _allocate_opp_table(). Other errors are just
ignored as before. Eventually those should be propagated as well.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
[ Viresh: skip checking return value of dev_pm_opp_get_opp_table() for
EPROBE_DEFER in domain.c, fix NULL return value and reorder
code a bit in core.c, and update exynos-asv.c ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Remove the unnecessary wrapper and merge
_dev_pm_opp_find_and_remove_table() with dev_pm_opp_remove_table().
Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Create separate routine _opp_set_rate_zero() to handle !target_freq
case.
Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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The OPP core needs to track if the resources of devices are
enabled/configured or not, as it disables the resources when target_freq
is set to 0.
Handle that with the new enabled flag and remove otherwise complex
conditional statements.
Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Expand the scope of the regulator_enabled flag and use it to track
status of all the resources. This will be used for other stuff in the
next patch.
Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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dev_pm_opp_set_rate() can now be called with freq = 0 in order
to either drop performance or bandwidth votes or to disable
regulators on platforms which support them.
In such cases, a subsequent call to dev_pm_opp_set_rate() with
the same frequency ends up returning early because 'old_freq == freq'
Instead make it fall through and put back the dropped performance
and bandwidth votes and/or enable back the regulators.
Cc: v5.3+ <stable@vger.kernel.org> # v5.3+
Fixes: cd7ea582866f ("opp: Make dev_pm_opp_set_rate() handle freq = 0 to drop performance votes")
Reported-by: Sajida Bhanu <sbhanu@codeaurora.org>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
Reported-by: Matthias Kaehlcke <mka@chromium.org>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
[ Viresh: Don't skip clk_set_rate() and massaged changelog ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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We get the opp_table pointer at the top of the function and so we should
put the pointer at the end of the function like all other exit paths
from this function do.
Cc: v5.8+ <stable@vger.kernel.org> # v5.8+
Fixes: b00e667a6d8b ("opp: Remove bandwidth votes when target_freq is zero")
Reviewed-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
[ Viresh: Split the patch into two ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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We get the opp_table pointer at the top of the function and so we should
put the pointer at the end of the function like all other exit paths
from this function do.
Cc: v5.7+ <stable@vger.kernel.org> # v5.7+
Fixes: aca48b61f963 ("opp: Manage empty OPP tables with clk handle")
Reviewed-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
[ Viresh: Split the patch into two ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm
Pull ARM cpufreq driver changes for v5.9-rc1 from Viresh Kumar:
"Here are the details:
- Adaptive voltage scaling (AVS) support and minor cleanups for
brcmstb driver (Florian Fainelli and Markus Mayer).
- A new tegra driver and cleanup for the existing one (Sumit Gupta and
Jon Hunter).
- Bandwidth level support for Qcom driver along with OPP changes (Sibi
Sankar).
- Cleanups to sti, cpufreq-dt, ap806, CPPC drivers (Viresh Kumar, Lee
Jones, Ivan Kokshaysky, Sven Auhagen, and Xin Hao).
- Make schedutil default governor for ARM (Valentin Schneider).
- Fix dependency issues for imx (Walter Lozano).
- Cleanup around cached_resolved_idx in cpufreq core (Viresh Kumar)."
* 'cpufreq/arm/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
cpufreq: make schedutil the default for arm and arm64
cpufreq: cached_resolved_idx can not be negative
cpufreq: Add Tegra194 cpufreq driver
dt-bindings: arm: Add NVIDIA Tegra194 CPU Complex binding
cpufreq: imx: Select NVMEM_IMX_OCOTP
cpufreq: sti-cpufreq: Fix some formatting and misspelling issues
cpufreq: tegra186: Simplify probe return path
cpufreq: CPPC: Reuse caps variable in few routines
cpufreq: ap806: fix cpufreq driver needs ap cpu clk
cpufreq: cppc: Reorder code and remove apply_hisi_workaround variable
cpufreq: dt: fix oops on armada37xx
cpufreq: brcmstb-avs-cpufreq: send S2_ENTER / S2_EXIT commands to AVS
cpufreq: brcmstb-avs-cpufreq: Support polling AVS firmware
cpufreq: brcmstb-avs-cpufreq: more flexible interface for __issue_avs_command()
cpufreq: qcom: Disable fast switch when scaling DDR/L3
cpufreq: qcom: Update the bandwidth levels on frequency change
OPP: Add and export helper to set bandwidth
cpufreq: blacklist SC7180 in cpufreq-dt-platdev
cpufreq: blacklist SDM845 in cpufreq-dt-platdev
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Add and export 'dev_pm_opp_set_bw' to set the bandwidth
levels associated with an OPP.
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Allow dev_pm_opp_get_freq() to work for disabled OPPs.
Signed-off-by: Andrew-sh.Cheng <andrew-sh.cheng@mediatek.com>
[ Viresh: Massaged commit log ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Export dev_pm_opp_adjust_voltage() as it may be used by modules later
on.
Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
[ Viresh: Rewrote commit log ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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We already drop several votes when target_freq is set to zero, drop
bandwidth votes as well.
Reported-by: Sibi Sankar <sibis@codeaurora.org>
Reviewed-by: Georgi Djakov <georgi.djakov@linaro.org>
Tested-by: Georgi Djakov <georgi.djakov@linaro.org>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
Tested-by: Sibi Sankar <sibis@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Add enable regulators to dev_pm_opp_set_regulators() and disable
regulators to dev_pm_opp_put_regulators(). Even if bootloader
leaves regulators enabled, they should be enabled in kernel in
order to increase the reference count.
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Clément Péron <peron.clem@gmail.com>
Tested-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Kamil Konieczny <k.konieczny@samsung.com>
[ Viresh: Enable the regulator only after it is programmed and add a
flag to track its status. ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Reorder the code a bit to make it more readable. Add additional comment
as well.
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Clément Péron <peron.clem@gmail.com>
Tested-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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If the OPP bandwidth values are populated, we want to switch also the
interconnect bandwidth in addition to frequency and voltage.
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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The OPP bindings now support bandwidth values, so add support to parse it
from device tree and store it into the new dev_pm_opp_icc_bw struct, which
is part of the dev_pm_opp.
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
[ Viresh: Create _read_bw() and use it, renamed _of_find_icc_paths() to
dev_pm_opp_of_find_icc_paths(), exported it and made opp_table
argument optional. Also drop the depends on from Kconfig. ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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The opp-hz DT property is not mandatory and we may use another property
as a key in the OPP table. Add helper functions to simplify the reading
and comparing the keys.
Signed-off-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
[ Viresh: Removed an unnecessary comment ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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With OPP core now supporting DVFS for IO devices, we have instances of
IO devices (same IP block) which require an OPP on some platforms/SoCs
while just needing to scale the clock on some others.
In order to avoid conditional code in every driver which supports such
devices (to check for availability of OPPs and then deciding to do
either dev_pm_opp_set_rate() or clk_set_rate()) add support to manage
empty OPP tables with a clk handle.
This makes dev_pm_opp_set_rate() equivalent of a clk_set_rate() for
devices with just a clk and no OPPs specified, and makes
dev_pm_opp_set_rate(0) bail out without throwing an error.
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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A kref or refcount isn't the right tool to be used here for counting
number of devices that are sharing the static OPPs created for the OPP
table. For example, we are reinitializing the kref again, after it
reaches a value of 0 and frees the resources, if the static OPPs get
added for the same OPP table structure (as the OPP table structure was
never freed). That is messy and very unclear.
This patch makes parsed_static_opps an unsigned integer and uses it to
count the number of users of the static OPPs. The increment and
decrement to parsed_static_opps is done under opp_table->lock now to
make sure no races are possible if the OPP table is getting added and
removed in parallel (which doesn't happen in practice, but can in
theory).
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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On some SoCs the Adaptive Voltage Scaling (AVS) technique is
employed to optimize the operating voltage of a device. At a
given frequency, the hardware monitors dynamic factors and either
makes a suggestion for how much to adjust a voltage for the
current frequency, or it automatically adjusts the voltage
without software intervention. Add an API to the OPP library for
the former case, so that AVS type devices can update the voltages
for an OPP when the hardware determines the voltage should
change. The assumption is that drivers like CPUfreq or devfreq
will register for the OPP notifiers and adjust the voltage
according to suggestions that AVS makes.
This patch is derived from [1] submitted by Stephen.
[1] https://lore.kernel.org/patchwork/patch/599279/
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
[Roger Lu: Changed to rcu less implementation]
Signed-off-by: Roger Lu <roger.lu@mediatek.com>
[s.nawrocki@samsung.com: added handling of OPP min/max voltage]
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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All the drivers, which use the OPP framework control regulators, which
are already enabled. Typically those regulators are also system critical,
due to providing power to CPU core or system buses. It turned out that
there are cases, where calling regulator_enable() on such boot-enabled
regulator has side-effects and might change its initial voltage due to
performing initial voltage balancing without all restrictions from the
consumers. Until this issue becomes finally solved in regulator core,
avoid calling regulator_enable()/disable() from the OPP framework.
This reverts commit 7f93ff73f7c8c8bfa6be33bcc16470b0b44682aa.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Add enable regulators to dev_pm_opp_set_regulators() and disable
regulators to dev_pm_opp_put_regulators(). Even if bootloader
leaves regulators enabled, they should be enabled in kernel in
order to increase the reference count.
Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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The list_kref was added for static OPPs and to track their users. The
kref is initialized while the static OPPs are added, but removed
unconditionally even if the static OPPs were never added. This causes
refcount mismatch warnings currently.
Fix that by always initializing the kref when the OPP table is first
initialized. The refcount is later incremented only for the second user
onwards.
Fixes: d0e8ae6c26da ("OPP: Create separate kref for static OPPs list")
Reported-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Since the performance states in the OPP table are unique, implement a
dev_pm_opp_find_level_exact() in order to be able to fetch a specific OPP.
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
[ Viresh: Updated commit log ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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The cpufreq drivers don't need to do runtime PM operations on the
virtual devices returned by dev_pm_domain_attach_by_name() and so the
virtual devices weren't shared with the callers of
dev_pm_opp_attach_genpd() earlier.
But the IO device drivers would want to do that. This patch updates the
prototype of dev_pm_opp_attach_genpd() to accept another argument to
return the pointer to the array of genpd virtual devices.
Reported-by: Rajendra Nayak <rnayak@codeaurora.org>
Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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A device may have multiple power-domains and not all of them may be
scalable (i.e. support performance states). But
dev_pm_opp_attach_genpd() doesn't take that into account currently.
Fix that by not verifying the names argument with "power-domain-names"
DT property and finding the index into the required-opps array. The
names argument will anyway get verified later on when we call
dev_pm_domain_attach_by_name().
Fixes: 6319aee10e53 ("opp: Attach genpds to devices from within OPP core")
Reported-by: Rajendra Nayak <rnayak@codeaurora.org>
Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm
Pull operating performance points (OPP) framework changes for v5.3
from Viresh Kumar:
"This pull request contains:
- OPP core changes to support a wider range of devices, like IO
devices (Rajendra Nayak and Stehpen Boyd).
- Fixes around genpd_virt_devs (Viresh Kumar).
- Fix for platform with set_opp() callback (Dmitry Osipenko)."
* 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
opp: Don't use IS_ERR on invalid supplies
opp: Make dev_pm_opp_set_rate() handle freq = 0 to drop performance votes
opp: Don't overwrite rounded clk rate
opp: Allocate genpd_virt_devs from dev_pm_opp_attach_genpd()
opp: Attach genpds to devices from within OPP core
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_set_opp_custom() receives a set of OPP supplies as its arguments and
the caller of it passes NULL when the supplies are not valid. But
_set_opp_custom(), by mistake, checks for error by performing
IS_ERR(old_supply) on it which will always evaluate to false.
The problem was spotted during of testing of upcoming update for the
NVIDIA Tegra CPUFreq driver.
Cc: stable <stable@vger.kernel.org>
Fixes: 7e535993fa4f ("OPP: Separate out custom OPP handler specific code")
Reported-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[ Viresh: Massaged changelog ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Based on 2 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation #
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-only
has been chosen to replace the boilerplate/reference in 4122 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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For devices with performance state, we use dev_pm_opp_set_rate() to set
the appropriate clk rate and the performance state.
We do need a way to remove the performance state vote when we idle the
device and turn the clocks off. Use dev_pm_opp_set_rate() with freq = 0
to achieve this.
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
[ Viresh: Updated _set_required_opps() to handle the !opp case ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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