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authorStephan Gerhold <stephan@gerhold.net>2020-07-27 12:30:46 +0300
committerViresh Kumar <viresh.kumar@linaro.org>2020-08-25 08:38:54 +0300
commitdd461cd9183fe80bee84fd6cab2a29bfc8f55a76 (patch)
treeb8e96a945b423d60872d6708c95b1cf8284f18b2 /drivers/opp
parent9123e3a74ec7b934a4a099e98af6a61c2f80bbf5 (diff)
downloadlinux-dd461cd9183fe80bee84fd6cab2a29bfc8f55a76.tar.xz
opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE_DEFER
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>
Diffstat (limited to 'drivers/opp')
-rw-r--r--drivers/opp/core.c53
-rw-r--r--drivers/opp/of.c8
2 files changed, 35 insertions, 26 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 9d7fb45b1786..9f1676989483 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1063,7 +1063,7 @@ static struct opp_table *_allocate_opp_table(struct device *dev, int index)
*/
opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
if (!opp_table)
- return NULL;
+ return ERR_PTR(-ENOMEM);
mutex_init(&opp_table->lock);
mutex_init(&opp_table->genpd_virt_dev_lock);
@@ -1074,8 +1074,8 @@ static struct opp_table *_allocate_opp_table(struct device *dev, int index)
opp_dev = _add_opp_dev(dev, opp_table);
if (!opp_dev) {
- kfree(opp_table);
- return NULL;
+ ret = -ENOMEM;
+ goto err;
}
_of_init_opp_table(opp_table, dev, index);
@@ -1084,16 +1084,21 @@ static struct opp_table *_allocate_opp_table(struct device *dev, int index)
opp_table->clk = clk_get(dev, NULL);
if (IS_ERR(opp_table->clk)) {
ret = PTR_ERR(opp_table->clk);
- if (ret != -EPROBE_DEFER)
- dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__,
- ret);
+ if (ret == -EPROBE_DEFER)
+ goto err;
+
+ dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret);
}
/* Find interconnect path(s) for the device */
ret = dev_pm_opp_of_find_icc_paths(dev, opp_table);
- if (ret)
+ if (ret) {
+ if (ret == -EPROBE_DEFER)
+ goto err;
+
dev_warn(dev, "%s: Error finding interconnect paths: %d\n",
__func__, ret);
+ }
BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
INIT_LIST_HEAD(&opp_table->opp_list);
@@ -1102,6 +1107,10 @@ static struct opp_table *_allocate_opp_table(struct device *dev, int index)
/* Secure the device table modification */
list_add(&opp_table->node, &opp_tables);
return opp_table;
+
+err:
+ kfree(opp_table);
+ return ERR_PTR(ret);
}
void _get_opp_table_kref(struct opp_table *opp_table)
@@ -1124,7 +1133,7 @@ static struct opp_table *_opp_get_opp_table(struct device *dev, int index)
if (opp_table) {
if (!_add_opp_dev_unlocked(dev, opp_table)) {
dev_pm_opp_put_opp_table(opp_table);
- opp_table = NULL;
+ opp_table = ERR_PTR(-ENOMEM);
}
goto unlock;
}
@@ -1568,8 +1577,8 @@ struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
struct opp_table *opp_table;
opp_table = dev_pm_opp_get_opp_table(dev);
- if (!opp_table)
- return ERR_PTR(-ENOMEM);
+ if (IS_ERR(opp_table))
+ return opp_table;
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
@@ -1627,8 +1636,8 @@ struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
struct opp_table *opp_table;
opp_table = dev_pm_opp_get_opp_table(dev);
- if (!opp_table)
- return ERR_PTR(-ENOMEM);
+ if (IS_ERR(opp_table))
+ return opp_table;
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
@@ -1720,8 +1729,8 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
int ret, i;
opp_table = dev_pm_opp_get_opp_table(dev);
- if (!opp_table)
- return ERR_PTR(-ENOMEM);
+ if (IS_ERR(opp_table))
+ return opp_table;
/* This should be called before OPPs are initialized */
if (WARN_ON(!list_empty(&opp_table->opp_list))) {
@@ -1830,8 +1839,8 @@ struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
int ret;
opp_table = dev_pm_opp_get_opp_table(dev);
- if (!opp_table)
- return ERR_PTR(-ENOMEM);
+ if (IS_ERR(opp_table))
+ return opp_table;
/* This should be called before OPPs are initialized */
if (WARN_ON(!list_empty(&opp_table->opp_list))) {
@@ -1898,8 +1907,8 @@ struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
return ERR_PTR(-EINVAL);
opp_table = dev_pm_opp_get_opp_table(dev);
- if (!opp_table)
- return ERR_PTR(-ENOMEM);
+ if (!IS_ERR(opp_table))
+ return opp_table;
/* This should be called before OPPs are initialized */
if (WARN_ON(!list_empty(&opp_table->opp_list))) {
@@ -1979,8 +1988,8 @@ struct opp_table *dev_pm_opp_attach_genpd(struct device *dev,
const char **name = names;
opp_table = dev_pm_opp_get_opp_table(dev);
- if (!opp_table)
- return ERR_PTR(-ENOMEM);
+ if (IS_ERR(opp_table))
+ return opp_table;
/*
* If the genpd's OPP table isn't already initialized, parsing of the
@@ -2150,8 +2159,8 @@ int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
int ret;
opp_table = dev_pm_opp_get_opp_table(dev);
- if (!opp_table)
- return -ENOMEM;
+ if (IS_ERR(opp_table))
+ return PTR_ERR(opp_table);
/* Fix regulator count for dynamic OPPs */
opp_table->regulator_count = 1;
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 0430290670ab..d8b623cc015a 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -947,8 +947,8 @@ int dev_pm_opp_of_add_table(struct device *dev)
int ret;
opp_table = dev_pm_opp_get_opp_table_indexed(dev, 0);
- if (!opp_table)
- return -ENOMEM;
+ if (IS_ERR(opp_table))
+ return PTR_ERR(opp_table);
/*
* OPPs have two version of bindings now. Also try the old (v1)
@@ -1002,8 +1002,8 @@ int dev_pm_opp_of_add_table_indexed(struct device *dev, int index)
}
opp_table = dev_pm_opp_get_opp_table_indexed(dev, index);
- if (!opp_table)
- return -ENOMEM;
+ if (IS_ERR(opp_table))
+ return PTR_ERR(opp_table);
ret = _of_add_opp_table_v2(dev, opp_table);
if (ret)