kernel/linux.git/drivers/base/platform-msi.c, branch v6.1.168

platform-msi: Export symbol platform_msi_create_irq_domain()

2022-09-28T13:21:05+00:00

Allow irqchip drivers using platform MSI to be built as modules. Signed-off-by: Frank Li [maz: rewrote commit message] Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20220922161246.20586-2-Frank.Li@nxp.com

platform-msi: Simplify platform device MSI code

2021-12-16T21:22:19+00:00

The allocation code is overly complex. It tries to have the MSI index space packed, which is not working when an interrupt is freed. There is no requirement for this. The only requirement is that the MSI index is unique. Move the MSI descriptor allocation into msi_domain_populate_irqs() and use the Linux interrupt number as MSI index which fulfils the unique requirement. This requires to lock the MSI descriptors which makes the lock order reverse to the regular MSI alloc/free functions vs. the domain mutex. Assign a seperate lockdep class for these MSI device domains. Signed-off-by: Thomas Gleixner Tested-by: Nishanth Menon Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/20211206210748.956731741@linutronix.de

platform-msi: Let core code handle MSI descriptors

2021-12-16T21:22:19+00:00

Use the core functionality for platform MSI interrupt domains. The platform device MSI interrupt domains will be converted in a later step. Signed-off-by: Thomas Gleixner Tested-by: Nishanth Menon Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/20211206210748.903173257@linutronix.de

platform-msi: Use msi_desc::msi_index

2021-12-16T21:16:40+00:00

Use the common msi_index member and get rid of the pointless wrapper struct. Signed-off-by: Thomas Gleixner Tested-by: Nishanth Menon Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/20211210221814.413638645@linutronix.de

platform-msi: Store platform private data pointer in msi_device_data

2021-12-16T21:16:39+00:00

Storing the platform private data in a MSI descriptor is sloppy at best. The data belongs to the device and not to the descriptor. Add a pointer to struct msi_device_data and store the pointer there. Signed-off-by: Thomas Gleixner Tested-by: Nishanth Menon Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/20211210221814.287680528@linutronix.de

platform-msi: Rename functions and clarify comments

2021-12-16T21:16:39+00:00

It's hard to distinguish what platform_msi_domain_alloc() and platform_msi_domain_alloc_irqs() are about. Make the distinction more explicit and add comments which explain the use cases properly. Signed-off-by: Thomas Gleixner Tested-by: Nishanth Menon Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/20211210221814.228706214@linutronix.de

platform-msi: Let the core code handle sysfs groups

2021-12-16T21:16:39+00:00

Set the domain info flag and remove the local sysfs code. Signed-off-by: Thomas Gleixner Tested-by: Nishanth Menon Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/20211210221814.109408832@linutronix.de

platform-msi: Allocate MSI device data on first use

2021-12-16T21:16:38+00:00

Allocate the MSI device data on first invocation of the allocation function for platform MSI private data. Signed-off-by: Thomas Gleixner Tested-by: Nishanth Menon Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/20211210221813.805529729@linutronix.de

device: Move MSI related data into a struct

2021-12-16T21:16:38+00:00

The only unconditional part of MSI data in struct device is the irqdomain pointer. Everything else can be allocated on demand. Create a data structure and move the irqdomain pointer into it. The other MSI specific parts are going to be removed from struct device in later steps. Signed-off-by: Thomas Gleixner Tested-by: Michael Kelley Tested-by: Nishanth Menon Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jason Gunthorpe Acked-by: Arnd Bergmann Link: https://lore.kernel.org/r/20211210221813.617178827@linutronix.de

platform-msi: Add ABI to show msi_irqs of platform devices

2021-08-24T07:16:20+00:00

PCI devices expose the associated MSI interrupts via sysfs, but platform devices which utilize MSI interrupts do not. This information is important for user space tools to optimize affinity settings. Utilize the generic MSI sysfs facility to expose this information for platform MSI. Signed-off-by: Barry Song Signed-off-by: Thomas Gleixner Acked-by: Greg Kroah-Hartman Acked-by: Bjorn Helgaas Acked-by: Marc Zyngier Link: https://lore.kernel.org/r/20210813035628.6844-3-21cnbao@gmail.com