Messages in this thread Patch in this message | | | From | Daniel Walker <> | Subject | [PATCH] genirq: allow selection of number of sparse irqs | Date | Wed, 27 Jul 2022 20:04:20 -0700 |
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Currently the maximum number of interrupters is capped at 8260 (64 + 8196) in most of the architectures were CONFIG_SPARSE_IRQ is selected. This upper limit is not sufficient for couple of existing SoC's from Marvell. For eg: Octeon TX2 series of processors support a maximum of 32K interrupters.
Allow configuration of the upper limit of the number of interrupts.
Cc: George Cherian <george.cherian@marvell.com> Cc: sgoutham@marvell.com Cc: "BOBBY Liu (bobbliu)" <bobbliu@cisco.com> Cc: xe-linux-external@cisco.com Signed-off-by: Daniel Walker <danielwa@cisco.com> --- kernel/irq/Kconfig | 23 +++++++++++++++++++++++ kernel/irq/internals.h | 10 +++++++++- 2 files changed, 32 insertions(+), 1 deletion(-)
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index db3d174c53d4..b356217abcfe 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -125,6 +125,29 @@ config SPARSE_IRQ If you don't know what to do here, say N. +choice + prompt "Select number of sparse irqs" + depends on SPARSE_IRQ + default SPARSE_IRQ_EXTEND_8K + help + Allows choosing the number of sparse irq's available on the + system. For each 8k of additional irqs added there is approximatly + 1kb of kernel size increase. + +config SPARSE_IRQ_EXTEND_8K + bool "8k" + +config SPARSE_IRQ_EXTEND_16K + bool "16K" + +config SPARSE_IRQ_EXTEND_32K + bool "32K" + +config SPARSE_IRQ_EXTEND_64K + bool "64K" + +endchoice + config GENERIC_IRQ_DEBUGFS bool "Expose irq internals in debugfs" depends on DEBUG_FS diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index f09c60393e55..25fe5abf6c16 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -12,7 +12,15 @@ #include <linux/sched/clock.h> #ifdef CONFIG_SPARSE_IRQ -# define IRQ_BITMAP_BITS (NR_IRQS + 8196) +# if defined(CONFIG_SPARSE_IRQ_EXTEND_8K) +# define IRQ_BITMAP_BITS (NR_IRQS + 8192 + 4) +# elif defined(CONFIG_SPARSE_IRQ_EXTEND_16K) +# define IRQ_BITMAP_BITS (NR_IRQS + 16384 + 4) +# elif defined(CONFIG_SPARSE_IRQ_EXTEND_32K) +# define IRQ_BITMAP_BITS (NR_IRQS + 32768 + 4) +# elif defined(CONFIG_SPARSE_IRQ_EXTEND_64K) +# define IRQ_BITMAP_BITS (NR_IRQS + 65536 + 4) +# endif #else # define IRQ_BITMAP_BITS NR_IRQS #endif -- 2.25.1
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