From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ard Biesheuvel Subject: [PATCH v3 0/2] implement workaround for Socionext Synquacer pre-ITS Date: Thu, 12 Oct 2017 19:32:45 +0100 Message-ID: <20171012183247.23679-1-ard.biesheuvel@linaro.org> Return-path: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: marc.zyngier-5wv7dgnIgG8@public.gmane.org, robin.murphy-5wv7dgnIgG8@public.gmane.org Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, daniel.thompson-vY8bQiOPoHsdnm+yROfE0A@public.gmane.org, leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, graeme.gregory-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, catalin.marinas-5wv7dgnIgG8@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, Ard Biesheuvel List-Id: devicetree@vger.kernel.org >>From patch 2/2: The Socionext Synquacer SoC's implementation of GICv3 has a so-called 'pre-ITS', which maps 32-bit writes targeted at a separate window of size '4 << device_id_bits' onto writes to GITS_TRANSLATER with device ID taken from bits [device_id_bits + 1:2] of the window offset. Writes that target GITS_TRANSLATER directly are reported as originating from device ID #0. So add a workaround for this. Given that this breaks isolation, clear the IRQ_DOMAIN_FLAG_MSI_REMAP flag as well. v3: - add patch to pull device ID space discovery forward, so we can quirk it as well (as we already do for Cavium) - use existing quirks framework as much as possible - get rid of ITS_WORKAROUND_xxx flag: it is no longer needed after the refactoring v2: - use a 32-bit host address/size rather than a PCI address, to factor out the involvement of an SMMU (which the platform does have, but it is unclear atm if it can be exposed to the OS) - add msi_domain_flags member to move the quirk flag checks out of the common code path Ard Biesheuvel (2): drivers/irqchip: gicv3: probe device ID space before quirks handling drivers/irqchip: gicv3: add workaround for Synquacer pre-ITS Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt | 4 + arch/arm64/Kconfig | 8 ++ drivers/irqchip/irq-gic-v3-its.c | 81 ++++++++++++++++---- 3 files changed, 78 insertions(+), 15 deletions(-) -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html