linux-kernel - [PATCH RFC 05/15] ims-msi: Add mask/unmask routines

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Date:   Tue, 21 Apr 2020 16:34:17 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     vkoul@...nel.org, megha.dey@...ux.intel.com, maz@...nel.org,
        bhelgaas@...gle.com, rafael@...nel.org, gregkh@...uxfoundation.org,
        tglx@...utronix.de, hpa@...or.com, alex.williamson@...hat.com,
        jacob.jun.pan@...el.com, ashok.raj@...el.com, jgg@...lanox.com,
        yi.l.liu@...el.com, baolu.lu@...el.com, kevin.tian@...el.com,
        sanjay.k.kumar@...el.com, tony.luck@...el.com, jing.lin@...el.com,
        dan.j.williams@...el.com, kwankhede@...dia.com,
        eric.auger@...hat.com, parav@...lanox.com
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-pci@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH RFC 05/15] ims-msi: Add mask/unmask routines

From: Megha Dey <megha.dey@...ux.intel.com>

Introduce the mask/unmask functions which would be used as callbacks
to the IRQ chip associated with the IMS domain.

Signed-off-by: Megha Dey <megha.dey@...ux.intel.com>
---
 drivers/base/ims-msi.c      |   47 +++++++++++++++++++++++++++++++++++++++++++
 drivers/base/platform-msi.c |   12 -----------
 include/linux/msi.h         |   14 +++++++++++++
 3 files changed, 61 insertions(+), 12 deletions(-)

diff --git a/drivers/base/ims-msi.c b/drivers/base/ims-msi.c
index 738f6d153155..896a5a1b2252 100644
--- a/drivers/base/ims-msi.c
+++ b/drivers/base/ims-msi.c
@@ -7,11 +7,56 @@
  * Author: Megha Dey <megha.dey@...el.com>
  */
 
+#include <linux/device.h>
 #include <linux/dmar.h>
+#include <linux/export.h>
 #include <linux/irq.h>
 #include <linux/mdev.h>
+#include <linux/msi.h>
 #include <linux/pci.h>
 
+static u32 __dev_ims_desc_mask_irq(struct msi_desc *desc, u32 flag)
+{
+	u32 mask_bits = desc->platform.masked;
+	const struct platform_msi_ops *ops;
+
+	ops = desc->platform.msi_priv_data->ops;
+	if (!ops)
+		return 0;
+
+	if (flag) {
+		if (ops->irq_mask)
+			mask_bits = ops->irq_mask(desc);
+	} else {
+		if (ops->irq_unmask)
+			mask_bits = ops->irq_unmask(desc);
+	}
+
+	return mask_bits;
+}
+
+/**
+ * dev_ims_mask_irq - Generic irq chip callback to mask IMS interrupts
+ * @data: pointer to irqdata associated to that interrupt
+ */
+static void dev_ims_mask_irq(struct irq_data *data)
+{
+	struct msi_desc *desc = irq_data_get_msi_desc(data);
+
+	desc->platform.masked = __dev_ims_desc_mask_irq(desc, 1);
+}
+
+/**
+ * dev_msi_unmask_irq - Generic irq chip callback to unmask IMS interrupts
+ * @data: pointer to irqdata associated to that interrupt
+ */
+void dev_ims_unmask_irq(struct irq_data *data)
+{
+	struct msi_desc *desc = irq_data_get_msi_desc(data);
+
+	desc->platform.masked = __dev_ims_desc_mask_irq(desc, 0);
+}
+
 /*
  * Determine if a dev is mdev or not. Return NULL if not mdev device.
  * Return mdev's parent dev if success.
@@ -69,6 +114,8 @@ static struct irq_chip dev_ims_ir_controller = {
 	.irq_set_vcpu_affinity	= irq_chip_set_vcpu_affinity_parent,
 	.flags			= IRQCHIP_SKIP_SET_WAKE,
 	.irq_write_msi_msg	= platform_msi_write_msg,
+	.irq_unmask             = dev_ims_unmask_irq,
+	.irq_mask               = dev_ims_mask_irq,
 };
 
 static struct msi_domain_info ims_ir_domain_info = {
diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c
index 59160e8cbfb1..6d8840db4a85 100644
--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -16,18 +16,6 @@
 #define DEV_ID_SHIFT	21
 #define MAX_DEV_MSIS	(1 << (32 - DEV_ID_SHIFT))
 
-/*
- * Internal data structure containing a (made up, but unique) devid
- * and the callback to write the MSI message.
- */
-struct platform_msi_priv_data {
-	struct device			*dev;
-	void				*host_data;
-	msi_alloc_info_t		arg;
-	const struct platform_msi_ops	*ops;
-	int				devid;
-};
-
 /* The devid allocator */
 static DEFINE_IDA(platform_msi_devid_ida);
 
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 80386468a7bc..8b5f24bf3c47 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -33,10 +33,12 @@ typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
  * platform_msi_desc - Platform device specific msi descriptor data
  * @msi_priv_data:	Pointer to platform private data
  * @msi_index:		The index of the MSI descriptor for multi MSI
+ * @masked:		mask bits
  */
 struct platform_msi_desc {
 	struct platform_msi_priv_data	*msi_priv_data;
 	u16				msi_index;
+	u32				masked;
 };
 
 /**
@@ -370,6 +372,18 @@ struct platform_msi_ops {
 	irq_write_msi_msg_t	write_msg;
 };
 
+/*
+ * Internal data structure containing a (made up, but unique) devid
+ * and the callback to write the MSI message.
+ */
+struct platform_msi_priv_data {
+	struct device			*dev;
+	void				*host_data;
+	msi_alloc_info_t		arg;
+	const struct platform_msi_ops	*ops;
+	int				devid;
+};
+
 int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
 			    bool force);