[patch V2 15/40] irqchip/gic-msi-lib: Prepare for DEVICE MSI to replace platform MSI

From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Will Deacon <will@kernel.org>,
	linux-pci@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jason Gunthorpe <jgg@mellanox.com>, Andrew Lunn <andrew@lunn.ch>,
	Gregory Clement <gregory.clement@bootlin.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
	Ammar Faizi <ammarfaizi2@gnuweeb.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Lorenzo Pieralisi <lpieralisi@kernel.org>,
	Nishanth Menon <nm@ti.com>, Tero Kristo <kristo@kernel.org>,
	Santosh Shilimkar <ssantosh@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	Vinod Koul <vkoul@kernel.org>, Sinan Kaya <okaya@kernel.org>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>
Subject: [patch V2 15/40] irqchip/gic-msi-lib: Prepare for DEVICE MSI to replace platform MSI
Date: Mon, 21 Nov 2022 15:39:47 +0100 (CET)	[thread overview]
Message-ID: <20221121140049.237988384@linutronix.de> (raw)
In-Reply-To: 20221121135653.208611233@linutronix.de

Add the prerequisites for DEVICE MSI into the shared select() and child
domain init function. These domains are really trivial and just provide a
custom irq chip callback to write the MSI message.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 drivers/irqchip/irq-gic-msi-lib.c |   13 +++++++++++++
 drivers/irqchip/irq-gic-msi-lib.h |    2 ++
 2 files changed, 15 insertions(+)

--- a/drivers/irqchip/irq-gic-msi-lib.c
+++ b/drivers/irqchip/irq-gic-msi-lib.c
@@ -55,6 +55,19 @@ bool gic_msi_lib_init_dev_msi_info(struc
 
 		pci_device_msi_mask_unmask_parent_enable();
 		break;
+	case DOMAIN_BUS_DEVICE_IMS:
+		/*
+		 * Per device IMS should never have any MSI feature bits
+		 * set. It's sole purpose is to create a dumb interrupt
+		 * chip which has a device specific irq_write_msi_msg()
+		 * callback.
+		 */
+		if (WARN_ON_ONCE(info->flags))
+			return false;
+
+		/* Core managed MSI descriptors */
+		info->flags = MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;
+		break;
 	default:
 		/*
 		 * This should never be reached. See
--- a/drivers/irqchip/irq-gic-msi-lib.h
+++ b/drivers/irqchip/irq-gic-msi-lib.h
@@ -15,6 +15,8 @@
 #define MATCH_PCI_MSI		(0)
 #endif
 
+#define MATCH_PLATFORM_MSI	BIT(DOMAIN_BUS_PLATFORM_MSI)
+
 int gic_msi_lib_irq_domain_select(struct irq_domain *d, struct irq_fwspec *fwspec,
 				  enum irq_domain_bus_token bus_token);
 


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