From 00d93ad485dad82f59ae2671841827f35760b50c Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 6 Feb 2026 15:48:16 +0000 Subject: irqchip/gic-v3-its: Limit number of per-device MSIs to the range the ITS supports commit ce9e40a9a5e5cff0b1b0d2fa582b3d71a8ce68e8 upstream. The ITS driver blindly assumes that EventIDs are in abundant supply, to the point where it never checks how many the hardware actually supports. It turns out that some pretty esoteric integrations make it so that only a few bits are available, all the way down to a single bit. Enforce the advertised limitation at the point of allocating the device structure, and hope that the endpoint driver can deal with such limitation. Fixes: 84a6a2e7fc18d ("irqchip: GICv3: ITS: device allocation and configuration") Signed-off-by: Marc Zyngier Signed-off-by: Thomas Gleixner Reviewed-by: Robin Murphy Reviewed-by: Zenghui Yu Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260206154816.3582887-1-maz@kernel.org Signed-off-by: Greg Kroah-Hartman --- include/linux/irqchip/arm-gic-v3.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/irqchip/arm-gic-v3.h') diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h index 70c0948f978e..0225121f3013 100644 --- a/include/linux/irqchip/arm-gic-v3.h +++ b/include/linux/irqchip/arm-gic-v3.h @@ -394,6 +394,7 @@ #define GITS_TYPER_VLPIS (1UL << 1) #define GITS_TYPER_ITT_ENTRY_SIZE_SHIFT 4 #define GITS_TYPER_ITT_ENTRY_SIZE GENMASK_ULL(7, 4) +#define GITS_TYPER_IDBITS GENMASK_ULL(12, 8) #define GITS_TYPER_IDBITS_SHIFT 8 #define GITS_TYPER_DEVBITS_SHIFT 13 #define GITS_TYPER_DEVBITS GENMASK_ULL(17, 13) -- cgit v1.2.3