| Message ID | 1606310689-7189-1-git-send-email-loic.poulain@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v5] bus: mhi: core: Fix device hierarchy | expand |
On Wed, Nov 25, 2020 at 02:24:49PM +0100, Loic Poulain wrote: > This patch fixes the hierarchical structure of MHI devices. Indeed, > MHI client devices are directly 'enumerated' from the mhi controller > and therefore must be direct descendants/children of their mhi > controller device, in accordance with the Linux Device Model. > > Today both MHI clients and controller devices are at the same level, > this patch ensures that MHI controller is parent of its client devices. > > The hierarchy is especially important for power management (safe > suspend/resume order). It is also useful for userspace to determine > relationship between MHI client devices and controllers. > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Hemant, Bhaumik: Can you please look into this change? Thanks, Mani > --- > v2: fix commit message > v3: reword commit message > v4: fix device destroy > v5: fix debugfs device show > > drivers/bus/mhi/core/debugfs.c | 4 +++- > drivers/bus/mhi/core/init.c | 10 +++++++++- > drivers/bus/mhi/core/pm.c | 4 ++-- > 3 files changed, 14 insertions(+), 4 deletions(-) > > diff --git a/drivers/bus/mhi/core/debugfs.c b/drivers/bus/mhi/core/debugfs.c > index 3a48801..7d43138 100644 > --- a/drivers/bus/mhi/core/debugfs.c > +++ b/drivers/bus/mhi/core/debugfs.c > @@ -159,7 +159,9 @@ static int mhi_debugfs_devices_show(struct seq_file *m, void *d) > return -ENODEV; > } > > - device_for_each_child(mhi_cntrl->cntrl_dev, m, mhi_device_info_show); > + /* Show controller and client(s) info */ > + mhi_device_info_show(&mhi_cntrl->mhi_dev->dev, m); > + device_for_each_child(&mhi_cntrl->mhi_dev->dev, m, mhi_device_info_show); > > return 0; > } > diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c > index 436221c..c7a7354 100644 > --- a/drivers/bus/mhi/core/init.c > +++ b/drivers/bus/mhi/core/init.c > @@ -1137,7 +1137,15 @@ struct mhi_device *mhi_alloc_device(struct mhi_controller *mhi_cntrl) > device_initialize(dev); > dev->bus = &mhi_bus_type; > dev->release = mhi_release_device; > - dev->parent = mhi_cntrl->cntrl_dev; > + > + if (mhi_cntrl->mhi_dev) { > + /* for MHI client devices, parent is the MHI controller device */ > + dev->parent = &mhi_cntrl->mhi_dev->dev; > + } else { > + /* for MHI controller device, parent is the bus device (e.g. pci device) */ > + dev->parent = mhi_cntrl->cntrl_dev; > + } > + > mhi_dev->mhi_cntrl = mhi_cntrl; > mhi_dev->dev_wake = 0; > > diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c > index a671f58..681960c 100644 > --- a/drivers/bus/mhi/core/pm.c > +++ b/drivers/bus/mhi/core/pm.c > @@ -504,7 +504,7 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl) > wake_up_all(&mhi_cntrl->state_event); > > dev_dbg(dev, "Reset all active channels and remove MHI devices\n"); > - device_for_each_child(mhi_cntrl->cntrl_dev, NULL, mhi_destroy_device); > + device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device); > > mutex_lock(&mhi_cntrl->pm_mutex); > > @@ -637,7 +637,7 @@ static void mhi_pm_sys_error_transition(struct mhi_controller *mhi_cntrl) > wake_up_all(&mhi_cntrl->state_event); > > dev_dbg(dev, "Reset all active channels and remove MHI devices\n"); > - device_for_each_child(mhi_cntrl->cntrl_dev, NULL, mhi_destroy_device); > + device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device); > > mutex_lock(&mhi_cntrl->pm_mutex); > > -- > 2.7.4 >
On 11/25/20 5:24 AM, Loic Poulain wrote: > This patch fixes the hierarchical structure of MHI devices. Indeed, > MHI client devices are directly 'enumerated' from the mhi controller > and therefore must be direct descendants/children of their mhi > controller device, in accordance with the Linux Device Model. > > Today both MHI clients and controller devices are at the same level, > this patch ensures that MHI controller is parent of its client devices. > > The hierarchy is especially important for power management (safe > suspend/resume order). It is also useful for userspace to determine > relationship between MHI client devices and controllers. > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Hemant Kumar <hemantk@codeaurora.org> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
On Wed, Nov 25, 2020 at 02:24:49PM +0100, Loic Poulain wrote: > This patch fixes the hierarchical structure of MHI devices. Indeed, > MHI client devices are directly 'enumerated' from the mhi controller > and therefore must be direct descendants/children of their mhi > controller device, in accordance with the Linux Device Model. > > Today both MHI clients and controller devices are at the same level, > this patch ensures that MHI controller is parent of its client devices. > > The hierarchy is especially important for power management (safe > suspend/resume order). It is also useful for userspace to determine > relationship between MHI client devices and controllers. > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Applied to mhi-next! Thanks, Mani > --- > v2: fix commit message > v3: reword commit message > v4: fix device destroy > v5: fix debugfs device show > > drivers/bus/mhi/core/debugfs.c | 4 +++- > drivers/bus/mhi/core/init.c | 10 +++++++++- > drivers/bus/mhi/core/pm.c | 4 ++-- > 3 files changed, 14 insertions(+), 4 deletions(-) > > diff --git a/drivers/bus/mhi/core/debugfs.c b/drivers/bus/mhi/core/debugfs.c > index 3a48801..7d43138 100644 > --- a/drivers/bus/mhi/core/debugfs.c > +++ b/drivers/bus/mhi/core/debugfs.c > @@ -159,7 +159,9 @@ static int mhi_debugfs_devices_show(struct seq_file *m, void *d) > return -ENODEV; > } > > - device_for_each_child(mhi_cntrl->cntrl_dev, m, mhi_device_info_show); > + /* Show controller and client(s) info */ > + mhi_device_info_show(&mhi_cntrl->mhi_dev->dev, m); > + device_for_each_child(&mhi_cntrl->mhi_dev->dev, m, mhi_device_info_show); > > return 0; > } > diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c > index 436221c..c7a7354 100644 > --- a/drivers/bus/mhi/core/init.c > +++ b/drivers/bus/mhi/core/init.c > @@ -1137,7 +1137,15 @@ struct mhi_device *mhi_alloc_device(struct mhi_controller *mhi_cntrl) > device_initialize(dev); > dev->bus = &mhi_bus_type; > dev->release = mhi_release_device; > - dev->parent = mhi_cntrl->cntrl_dev; > + > + if (mhi_cntrl->mhi_dev) { > + /* for MHI client devices, parent is the MHI controller device */ > + dev->parent = &mhi_cntrl->mhi_dev->dev; > + } else { > + /* for MHI controller device, parent is the bus device (e.g. pci device) */ > + dev->parent = mhi_cntrl->cntrl_dev; > + } > + > mhi_dev->mhi_cntrl = mhi_cntrl; > mhi_dev->dev_wake = 0; > > diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c > index a671f58..681960c 100644 > --- a/drivers/bus/mhi/core/pm.c > +++ b/drivers/bus/mhi/core/pm.c > @@ -504,7 +504,7 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl) > wake_up_all(&mhi_cntrl->state_event); > > dev_dbg(dev, "Reset all active channels and remove MHI devices\n"); > - device_for_each_child(mhi_cntrl->cntrl_dev, NULL, mhi_destroy_device); > + device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device); > > mutex_lock(&mhi_cntrl->pm_mutex); > > @@ -637,7 +637,7 @@ static void mhi_pm_sys_error_transition(struct mhi_controller *mhi_cntrl) > wake_up_all(&mhi_cntrl->state_event); > > dev_dbg(dev, "Reset all active channels and remove MHI devices\n"); > - device_for_each_child(mhi_cntrl->cntrl_dev, NULL, mhi_destroy_device); > + device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device); > > mutex_lock(&mhi_cntrl->pm_mutex); > > -- > 2.7.4 >
Hello: This patch was applied to qcom/linux.git (refs/heads/for-next): On Wed, 25 Nov 2020 14:24:49 +0100 you wrote: > This patch fixes the hierarchical structure of MHI devices. Indeed, > MHI client devices are directly 'enumerated' from the mhi controller > and therefore must be direct descendants/children of their mhi > controller device, in accordance with the Linux Device Model. > > Today both MHI clients and controller devices are at the same level, > this patch ensures that MHI controller is parent of its client devices. > > [...] Here is the summary with links: - [v5] bus: mhi: core: Fix device hierarchy https://git.kernel.org/qcom/c/10ea8bcda5ae You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
diff --git a/drivers/bus/mhi/core/debugfs.c b/drivers/bus/mhi/core/debugfs.c index 3a48801..7d43138 100644 --- a/drivers/bus/mhi/core/debugfs.c +++ b/drivers/bus/mhi/core/debugfs.c @@ -159,7 +159,9 @@ static int mhi_debugfs_devices_show(struct seq_file *m, void *d) return -ENODEV; } - device_for_each_child(mhi_cntrl->cntrl_dev, m, mhi_device_info_show); + /* Show controller and client(s) info */ + mhi_device_info_show(&mhi_cntrl->mhi_dev->dev, m); + device_for_each_child(&mhi_cntrl->mhi_dev->dev, m, mhi_device_info_show); return 0; } diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index 436221c..c7a7354 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -1137,7 +1137,15 @@ struct mhi_device *mhi_alloc_device(struct mhi_controller *mhi_cntrl) device_initialize(dev); dev->bus = &mhi_bus_type; dev->release = mhi_release_device; - dev->parent = mhi_cntrl->cntrl_dev; + + if (mhi_cntrl->mhi_dev) { + /* for MHI client devices, parent is the MHI controller device */ + dev->parent = &mhi_cntrl->mhi_dev->dev; + } else { + /* for MHI controller device, parent is the bus device (e.g. pci device) */ + dev->parent = mhi_cntrl->cntrl_dev; + } + mhi_dev->mhi_cntrl = mhi_cntrl; mhi_dev->dev_wake = 0; diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index a671f58..681960c 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -504,7 +504,7 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl) wake_up_all(&mhi_cntrl->state_event); dev_dbg(dev, "Reset all active channels and remove MHI devices\n"); - device_for_each_child(mhi_cntrl->cntrl_dev, NULL, mhi_destroy_device); + device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device); mutex_lock(&mhi_cntrl->pm_mutex); @@ -637,7 +637,7 @@ static void mhi_pm_sys_error_transition(struct mhi_controller *mhi_cntrl) wake_up_all(&mhi_cntrl->state_event); dev_dbg(dev, "Reset all active channels and remove MHI devices\n"); - device_for_each_child(mhi_cntrl->cntrl_dev, NULL, mhi_destroy_device); + device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device); mutex_lock(&mhi_cntrl->pm_mutex);