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Message-ID: <20221121140049.237988384@linutronix.de>
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>,
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        Ammar Faizi <ammarfaizi2@gnuweeb.org>,
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        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>,
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        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
References: <20221121135653.208611233@linutronix.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Date:   Mon, 21 Nov 2022 15:39:47 +0100 (CET)
Precedence: bulk

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);