On Fri, 26 Feb 2021 20:11:16 +0000,
Megha Dey <megha....@intel.com> wrote:
>
> Generic IMS(Interrupt Message Store) irq chips and irq domain
> implementations for IMS based devices which store the interrupt messages
> in an array in device memory.
>
> Allocation and freeing of interrupts happens via the generic
> msi_domain_alloc/free_irqs() interface. No special purpose IMS magic
> required as long as the interrupt domain is stored in the underlying
> device struct. The irq_set_auxdata() is used to program the pasid into
> the IMS entry.
>
> [Megha: Fixed compile time errors
> Added necessary dependencies to IMS_MSI_ARRAY config
> Fixed polarity of IMS_VECTOR_CTRL
> Added reads after writes to flush writes to device
> Added set_desc ops to IMS msi domain ops
> Tested the IMS infrastructure with the IDXD driver]
>
> Reviewed-by: Tony Luck <tony.l...@intel.com>
> Signed-off-by: Thomas Gleixner <t...@linutronix.de>
> Signed-off-by: Megha Dey <megha....@intel.com>
> ---
> drivers/irqchip/Kconfig | 14 +++
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-ims-msi.c | 211
> ++++++++++++++++++++++++++++++++++++
> include/linux/irqchip/irq-ims-msi.h | 68 ++++++++++++
> 4 files changed, 294 insertions(+)
> create mode 100644 drivers/irqchip/irq-ims-msi.c
> create mode 100644 include/linux/irqchip/irq-ims-msi.h
>
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index e74fa20..2fb0c24 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -586,4 +586,18 @@ config MST_IRQ
> help
> Support MStar Interrupt Controller.
>
> +config IMS_MSI
> + depends on PCI
> + select DEVICE_MSI
> + bool
> +
> +config IMS_MSI_ARRAY
> + bool "IMS Interrupt Message Store MSI controller for device memory
> storage arrays"
> + depends on PCI
> + select IMS_MSI
> + select GENERIC_MSI_IRQ_DOMAIN
> + help
> + Support for IMS Interrupt Message Store MSI controller
> + with IMS slot storage in a slot array in device memory
> +
> endmenu
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index c59b95a..e903201 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -113,3 +113,4 @@ obj-$(CONFIG_LOONGSON_PCH_MSI) +=
> irq-loongson-pch-msi.o
> obj-$(CONFIG_MST_IRQ) += irq-mst-intc.o
> obj-$(CONFIG_SL28CPLD_INTC) += irq-sl28cpld.o
> obj-$(CONFIG_MACH_REALTEK_RTL) += irq-realtek-rtl.o
> +obj-$(CONFIG_IMS_MSI) += irq-ims-msi.o
> diff --git a/drivers/irqchip/irq-ims-msi.c b/drivers/irqchip/irq-ims-msi.c
> new file mode 100644
> index 0000000..fa23207
> --- /dev/null
> +++ b/drivers/irqchip/irq-ims-msi.c
> @@ -0,0 +1,211 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// (C) Copyright 2021 Thomas Gleixner <t...@linutronix.de>
> +/*
> + * Shared interrupt chips and irq domains for IMS devices
> + */
> +#include <linux/device.h>
> +#include <linux/slab.h>
> +#include <linux/msi.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +
> +#include <linux/irqchip/irq-ims-msi.h>
> +
> +#ifdef CONFIG_IMS_MSI_ARRAY
Given that this covers the whole driver, what is this #defined used
for? You might as well make the driver depend on this config option.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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