linux-kernel - [PATCH 07/16] thunderbolt: Configure interrupt throttling for all interrupts

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Message-Id: <20170918153049.44185-8-mika.westerberg@linux.intel.com>
Date:   Mon, 18 Sep 2017 18:30:40 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        Amir Levy <amir.jer.levy@...el.com>,
        Mario.Limonciello@...l.com, Lukas Wunner <lukas@...ner.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 07/16] thunderbolt: Configure interrupt throttling for all interrupts

This will keep the interrupt delivery rate reasonable. The value used
here (128 us) is a recommendation from the hardware people.

This code is based on the work done by Amir Levy and Michael Jamet.

Signed-off-by: Michael Jamet <michael.jamet@...el.com>
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@...el.com>
---
 drivers/thunderbolt/nhi.c      | 22 +++++++++++++++++++---
 drivers/thunderbolt/nhi_regs.h |  2 ++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index 05af126a2435..bc44cbaaf05a 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -651,6 +651,21 @@ static int nhi_suspend_noirq(struct device *dev)
 	return tb_domain_suspend_noirq(tb);
 }
 
+static void nhi_enable_int_throttling(struct tb_nhi *nhi)
+{
+	u32 throttle = DIV_ROUND_UP(128 * NSEC_PER_USEC, 256);
+	unsigned int i;
+
+	/*
+	 * Configure interrupt throttling for all vectors even if we
+	 * only use few.
+	 */
+	for (i = 0; i < MSIX_MAX_VECS; i++) {
+		u32 reg = REG_INT_THROTTLING_RATE + i * 4;
+		iowrite32(throttle, nhi->iobase + reg);
+	}
+}
+
 static int nhi_resume_noirq(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
@@ -663,6 +678,8 @@ static int nhi_resume_noirq(struct device *dev)
 	 */
 	if (!pci_device_is_present(pdev))
 		tb->nhi->going_away = true;
+	else
+		nhi_enable_int_throttling(tb->nhi);
 
 	return tb_domain_resume_noirq(tb);
 }
@@ -717,6 +734,8 @@ static int nhi_init_msi(struct tb_nhi *nhi)
 	/* In case someone left them on. */
 	nhi_disable_interrupts(nhi);
 
+	nhi_enable_int_throttling(nhi);
+
 	ida_init(&nhi->msix_ida);
 
 	/*
@@ -796,9 +815,6 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	pci_set_master(pdev);
 
-	/* magic value - clock related? */
-	iowrite32(3906250 / 10000, nhi->iobase + 0x38c00);
-
 	tb = icm_probe(nhi);
 	if (!tb)
 		tb = tb_probe(nhi);
diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h
index 09ed574e92ff..46eff69b19ad 100644
--- a/drivers/thunderbolt/nhi_regs.h
+++ b/drivers/thunderbolt/nhi_regs.h
@@ -95,6 +95,8 @@ struct ring_desc {
 #define REG_RING_INTERRUPT_BASE	0x38200
 #define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
 
+#define REG_INT_THROTTLING_RATE	0x38c00
+
 /* Interrupt Vector Allocation */
 #define REG_INT_VEC_ALLOC_BASE	0x38c40
 #define REG_INT_VEC_ALLOC_BITS	4
-- 
2.13.5