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From: Kishon Vijay Abraham I <kishon@ti.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	Marc Zyngier <maz@kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>
Cc: <linux-kernel@vger.kernel.org>, <linux-pci@vger.kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Kishon Vijay Abraham I <kishon@ti.com>, <lokeshvutla@ti.com>
Subject: [PATCH 3/3] irqchip/gic-v3-its: Include "msi-map-mask" for calculating nvecs
Date: Mon, 20 Sep 2021 12:11:33 +0530	[thread overview]
Message-ID: <20210920064133.14115-4-kishon@ti.com> (raw)
In-Reply-To: <20210920064133.14115-1-kishon@ti.com>

Using "msi-map-mask" in device tree lets multiple PCIe requestor ID to
use the same GIC ITS device ID. So while creating the Interrupt
Translation Table (ITT) for a specific GIC ITS device ID, the total number
of interrupts required by all the PCIe requestor ID that maps to the
same GIC ITS device ID should be calculated

Add support for gic-v3-its to include "msi-map-mask" property in device
tree for calculating the total number of MSI interrupts in
its_pci_msi_prepare().

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/irqchip/irq-gic-v3-its-pci-msi.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its-pci-msi.c b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
index ad2810c017ed..c79bca1a5787 100644
--- a/drivers/irqchip/irq-gic-v3-its-pci-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
@@ -54,9 +54,13 @@ static int its_get_pci_alias(struct pci_dev *pdev, u16 alias, void *data)
 static int its_pci_msi_prepare(struct irq_domain *domain, struct device *dev,
 			       int nvec, msi_alloc_info_t *info)
 {
+	int alias_count = 0, map_count = 0, minnvec = 1, ret;
 	struct pci_dev *pdev, *alias_dev;
 	struct msi_domain_info *msi_info;
-	int alias_count = 0, minnvec = 1;
+	struct device *parent_dev;
+	struct pci_bus *root_bus;
+	struct device_node *np;
+	u32 map_mask, rid;
 
 	if (!dev_is_pci(dev))
 		return -EINVAL;
@@ -78,6 +82,21 @@ static int its_pci_msi_prepare(struct irq_domain *domain, struct device *dev,
 		info->flags |= MSI_ALLOC_FLAGS_PROXY_DEVICE;
 	}
 
+	for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) {
+		np = parent_dev->of_node;
+		if (!np)
+			continue;
+
+		ret = of_property_read_u32(np, "msi-map-mask", &map_mask);
+		if (!ret && map_mask != 0xffff) {
+			rid = pci_dev_id(pdev) & map_mask;
+			root_bus = find_pci_root_bus(pdev->bus);
+			__pci_walk_bus(root_bus, its_pci_msi_vec_count, &map_count, rid, map_mask);
+			break;
+		}
+	}
+	alias_count = max(map_count, alias_count);
+
 	/* ITS specific DeviceID, as the core ITS ignores dev. */
 	info->scratchpad[0].ul = pci_msi_domain_get_msi_rid(domain, pdev);
 
-- 
2.17.1


  parent reply	other threads:[~2021-09-20  6:42 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-20  6:41 [PATCH 0/3] PCI/gic-v3-its: Add support for same ITS device ID for multiple PCIe devices Kishon Vijay Abraham I
2021-09-20  6:41 ` [PATCH 1/3] PCI: Add support in pci_walk_bus() to invoke callback matching RID Kishon Vijay Abraham I
2021-09-20  8:56   ` Marc Zyngier
2021-09-20 14:28     ` Kishon Vijay Abraham I
2021-09-20 18:01       ` Marc Zyngier
2021-09-22  1:26         ` Kishon Vijay Abraham I
2021-09-27 14:45           ` Marc Zyngier
2021-09-27 14:56             ` Kishon Vijay Abraham I
2021-09-20  6:41 ` [PATCH 2/3] PCI: Export find_pci_root_bus() Kishon Vijay Abraham I
2021-09-20  8:37   ` Marc Zyngier
2021-09-20  6:41 ` Kishon Vijay Abraham I [this message]
2021-09-20  8:36   ` [PATCH 3/3] irqchip/gic-v3-its: Include "msi-map-mask" for calculating nvecs Marc Zyngier
2021-09-20  9:14 ` [PATCH 0/3] PCI/gic-v3-its: Add support for same ITS device ID for multiple PCIe devices Marc Zyngier
2021-09-20 11:22   ` Kishon Vijay Abraham I
2021-09-20 11:36     ` Marc Zyngier

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