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From: Eric Auger <eric.auger@redhat.com>
To: eric.auger.pro@gmail.com, eric.auger@redhat.com, maz@kernel.org,
	kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
	qemu-devel@nongnu.org, qemu-arm@nongnu.org
Cc: andre.przywara@arm.com, thuth@redhat.com
Subject: [kvm-unit-tests PATCH v2 02/16] arm: gic: Provide per-IRQ helper functions
Date: Fri, 10 Jan 2020 15:53:58 +0100
Message-ID: <20200110145412.14937-3-eric.auger@redhat.com> (raw)
In-Reply-To: <20200110145412.14937-1-eric.auger@redhat.com>

From: Andre Przywara <andre.przywara@arm.com>

A common theme when accessing per-IRQ parameters in the GIC distributor
is to set fields of a certain bit width in a range of MMIO registers.
Examples are the enabled status (one bit per IRQ), the level/edge
configuration (2 bits per IRQ) or the priority (8 bits per IRQ).

Add a generic helper function which is able to mask and set the
respective number of bits, given the IRQ number and the MMIO offset.
Provide wrappers using this function to easily allow configuring an IRQ.

For now assume that private IRQ numbers always refer to the current CPU.
In a GICv2 accessing the "other" private IRQs is not easily doable (the
registers are banked per CPU on the same MMIO address), so we impose the
same limitation on GICv3, even though those registers are not banked
there anymore.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>

---

initialize reg
---
 lib/arm/asm/gic-v3.h |  2 +
 lib/arm/asm/gic.h    |  8 ++++
 lib/arm/gic.c        | 90 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 100 insertions(+)

diff --git a/lib/arm/asm/gic-v3.h b/lib/arm/asm/gic-v3.h
index 0dc838b..6beeab6 100644
--- a/lib/arm/asm/gic-v3.h
+++ b/lib/arm/asm/gic-v3.h
@@ -23,6 +23,8 @@
 #define GICD_CTLR_ENABLE_G1A		(1U << 1)
 #define GICD_CTLR_ENABLE_G1		(1U << 0)
 
+#define GICD_IROUTER			0x6000
+
 /* Re-Distributor registers, offsets from RD_base */
 #define GICR_TYPER			0x0008
 
diff --git a/lib/arm/asm/gic.h b/lib/arm/asm/gic.h
index 09826fd..21cdb58 100644
--- a/lib/arm/asm/gic.h
+++ b/lib/arm/asm/gic.h
@@ -74,5 +74,13 @@ extern void gic_write_eoir(u32 irqstat);
 extern void gic_ipi_send_single(int irq, int cpu);
 extern void gic_ipi_send_mask(int irq, const cpumask_t *dest);
 
+void gic_set_irq_bit(int irq, int offset);
+void gic_enable_irq(int irq);
+void gic_disable_irq(int irq);
+void gic_set_irq_priority(int irq, u8 prio);
+void gic_set_irq_target(int irq, int cpu);
+void gic_set_irq_group(int irq, int group);
+int gic_get_irq_group(int irq);
+
 #endif /* !__ASSEMBLY__ */
 #endif /* _ASMARM_GIC_H_ */
diff --git a/lib/arm/gic.c b/lib/arm/gic.c
index 9430116..aa9cb86 100644
--- a/lib/arm/gic.c
+++ b/lib/arm/gic.c
@@ -146,3 +146,93 @@ void gic_ipi_send_mask(int irq, const cpumask_t *dest)
 	assert(gic_common_ops && gic_common_ops->ipi_send_mask);
 	gic_common_ops->ipi_send_mask(irq, dest);
 }
+
+enum gic_bit_access {
+	ACCESS_READ,
+	ACCESS_SET,
+	ACCESS_RMW
+};
+
+static u8 gic_masked_irq_bits(int irq, int offset, int bits, u8 value,
+			      enum gic_bit_access access)
+{
+	void *base;
+	int split = 32 / bits;
+	int shift = (irq % split) * bits;
+	u32 reg = 0, mask = ((1U << bits) - 1) << shift;
+
+	switch (gic_version()) {
+	case 2:
+		base = gicv2_dist_base();
+		break;
+	case 3:
+		if (irq < 32)
+			base = gicv3_sgi_base();
+		else
+			base = gicv3_dist_base();
+		break;
+	default:
+		return 0;
+	}
+	base += offset + (irq / split) * 4;
+
+	switch (access) {
+	case ACCESS_READ:
+		return (readl(base) & mask) >> shift;
+	case ACCESS_SET:
+		reg = 0;
+		break;
+	case ACCESS_RMW:
+		reg = readl(base) & ~mask;
+		break;
+	}
+
+	writel(reg | ((u32)value << shift), base);
+
+	return 0;
+}
+
+void gic_set_irq_bit(int irq, int offset)
+{
+	gic_masked_irq_bits(irq, offset, 1, 1, ACCESS_SET);
+}
+
+void gic_enable_irq(int irq)
+{
+	gic_set_irq_bit(irq, GICD_ISENABLER);
+}
+
+void gic_disable_irq(int irq)
+{
+	gic_set_irq_bit(irq, GICD_ICENABLER);
+}
+
+void gic_set_irq_priority(int irq, u8 prio)
+{
+	gic_masked_irq_bits(irq, GICD_IPRIORITYR, 8, prio, ACCESS_RMW);
+}
+
+void gic_set_irq_target(int irq, int cpu)
+{
+	if (irq < 32)
+		return;
+
+	if (gic_version() == 2) {
+		gic_masked_irq_bits(irq, GICD_ITARGETSR, 8, 1U << cpu,
+				    ACCESS_RMW);
+
+		return;
+	}
+
+	writeq(cpus[cpu], gicv3_dist_base() + GICD_IROUTER + irq * 8);
+}
+
+void gic_set_irq_group(int irq, int group)
+{
+	gic_masked_irq_bits(irq, GICD_IGROUPR, 1, group, ACCESS_RMW);
+}
+
+int gic_get_irq_group(int irq)
+{
+	return gic_masked_irq_bits(irq, GICD_IGROUPR, 1, 0, ACCESS_READ);
+}
-- 
2.20.1

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  parent reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 14:53 [kvm-unit-tests PATCH v2 00/16] arm/arm64: Add ITS tests Eric Auger
2020-01-10 14:53 ` [kvm-unit-tests PATCH v2 01/16] libcflat: Add other size defines Eric Auger
2020-01-10 14:53 ` Eric Auger [this message]
2020-01-10 14:53 ` [kvm-unit-tests PATCH v2 03/16] arm/arm64: gic: Introduce setup_irq() helper Eric Auger
2020-01-13 16:53   ` Andrew Jones
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 04/16] arm/arm64: gicv3: Add some re-distributor defines Eric Auger
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 05/16] arm/arm64: ITS: Introspection tests Eric Auger
2020-01-13 17:11   ` Andrew Jones
2020-01-13 17:33   ` Andrew Jones
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 06/16] arm/arm64: ITS: Test BASER Eric Auger
2020-01-13 17:21   ` Andrew Jones
2020-01-15 17:16     ` Auger Eric
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 07/16] arm/arm64: ITS: Set the LPI config and pending tables Eric Auger
2020-01-13 17:31   ` Andrew Jones
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 08/16] arm/arm64: ITS: Init the command queue Eric Auger
2020-01-13 17:37   ` Andrew Jones
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 09/16] arm/arm64: ITS: Enable/Disable LPIs at re-distributor level Eric Auger
2020-01-13 17:44   ` Andrew Jones
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 10/16] arm/arm64: ITS: its_enable_defaults Eric Auger
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 11/16] arm/arm64: ITS: Device and collection Initialization Eric Auger
2020-01-13 17:48   ` Andrew Jones
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 12/16] arm/arm64: ITS: commands Eric Auger
2020-01-13 18:00   ` Andrew Jones
2020-01-15 17:13     ` Auger Eric
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 13/16] arm/arm64: ITS: INT functional tests Eric Auger
2020-01-13 18:17   ` Andrew Jones
2020-01-15 17:11     ` Auger Eric
2020-01-16  8:06       ` Andrew Jones
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 14/16] arm/run: Allow Migration tests Eric Auger
2020-01-13 18:40   ` Andrew Jones
2020-01-15 17:04     ` Auger Eric
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 15/16] arm/arm64: ITS: migration tests Eric Auger
2020-01-10 14:54 ` [kvm-unit-tests PATCH v2 16/16] arm/arm64: ITS: pending table migration test Eric Auger
2020-01-13 18:45   ` Andrew Jones
2020-01-15 17:06     ` Auger Eric

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