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Date: Mon, 26 Nov 2012 15:19:08 +0200
From: Terje Bergstrom <tbergstrom@...dia.com>
To: <thierry.reding@...onic-design.de>, <linux-tegra@...r.kernel.org>,
<dri-devel@...ts.freedesktop.org>
CC: <linux-kernel@...r.kernel.org>,
Terje Bergstrom <tbergstrom@...dia.com>
Subject: [RFC v2 2/8] video: tegra: Add syncpoint wait and interrupts
Add support for sync point interrupts, and sync point wait. Sync point
wait uses interrupts for unblocking wait.
Signed-off-by: Terje Bergstrom <tbergstrom@...dia.com>
---
drivers/video/tegra/host/Makefile | 1 +
drivers/video/tegra/host/chip_support.h | 17 ++
drivers/video/tegra/host/dev.c | 7 +
drivers/video/tegra/host/host1x/host1x.c | 33 +++
drivers/video/tegra/host/host1x/host1x.h | 2 +
drivers/video/tegra/host/host1x/host1x01.c | 2 +
drivers/video/tegra/host/host1x/host1x_intr.c | 263 ++++++++++++++++++
drivers/video/tegra/host/nvhost_intr.c | 363 +++++++++++++++++++++++++
drivers/video/tegra/host/nvhost_intr.h | 102 +++++++
drivers/video/tegra/host/nvhost_syncpt.c | 111 ++++++++
drivers/video/tegra/host/nvhost_syncpt.h | 10 +
include/linux/nvhost.h | 2 +
12 files changed, 913 insertions(+)
create mode 100644 drivers/video/tegra/host/host1x/host1x_intr.c
create mode 100644 drivers/video/tegra/host/nvhost_intr.c
create mode 100644 drivers/video/tegra/host/nvhost_intr.h
diff --git a/drivers/video/tegra/host/Makefile b/drivers/video/tegra/host/Makefile
index 3edab4a..24acccc 100644
--- a/drivers/video/tegra/host/Makefile
+++ b/drivers/video/tegra/host/Makefile
@@ -3,6 +3,7 @@ ccflags-y = -Idrivers/video/tegra/host
nvhost-objs = \
nvhost_acm.o \
nvhost_syncpt.o \
+ nvhost_intr.o \
dev.o \
chip_support.o
diff --git a/drivers/video/tegra/host/chip_support.h b/drivers/video/tegra/host/chip_support.h
index acfa2f1..5c8f49f 100644
--- a/drivers/video/tegra/host/chip_support.h
+++ b/drivers/video/tegra/host/chip_support.h
@@ -25,6 +25,7 @@
struct output;
struct nvhost_master;
+struct nvhost_intr;
struct nvhost_syncpt;
struct platform_device;
@@ -38,14 +39,30 @@ struct nvhost_syncpt_ops {
const char * (*name)(struct nvhost_syncpt *, u32 id);
};
+struct nvhost_intr_ops {
+ void (*init_host_sync)(struct nvhost_intr *);
+ void (*set_host_clocks_per_usec)(
+ struct nvhost_intr *, u32 clocks);
+ void (*set_syncpt_threshold)(
+ struct nvhost_intr *, u32 id, u32 thresh);
+ void (*enable_syncpt_intr)(struct nvhost_intr *, u32 id);
+ void (*disable_syncpt_intr)(struct nvhost_intr *, u32 id);
+ void (*disable_all_syncpt_intrs)(struct nvhost_intr *);
+ int (*request_host_general_irq)(struct nvhost_intr *);
+ void (*free_host_general_irq)(struct nvhost_intr *);
+ int (*free_syncpt_irq)(struct nvhost_intr *);
+};
+
struct nvhost_chip_support {
const char *soc_name;
struct nvhost_syncpt_ops syncpt;
+ struct nvhost_intr_ops intr;
};
struct nvhost_chip_support *nvhost_get_chip_ops(void);
#define syncpt_op() (nvhost_get_chip_ops()->syncpt)
+#define intr_op() (nvhost_get_chip_ops()->intr)
int nvhost_init_chip_support(struct nvhost_master *host);
diff --git a/drivers/video/tegra/host/dev.c b/drivers/video/tegra/host/dev.c
index 98c9c9f..025a820 100644
--- a/drivers/video/tegra/host/dev.c
+++ b/drivers/video/tegra/host/dev.c
@@ -43,6 +43,13 @@ u32 host1x_syncpt_read(u32 id)
}
EXPORT_SYMBOL(host1x_syncpt_read);
+int host1x_syncpt_wait(u32 id, u32 thresh, u32 timeout, u32 *value)
+{
+ struct nvhost_syncpt *sp = &nvhost->syncpt;
+ return nvhost_syncpt_wait_timeout(sp, id, thresh, timeout, value);
+}
+EXPORT_SYMBOL(host1x_syncpt_wait);
+
bool host1x_powered(struct platform_device *dev)
{
bool ret = 0;
diff --git a/drivers/video/tegra/host/host1x/host1x.c b/drivers/video/tegra/host/host1x/host1x.c
index 77ff00b..766931b 100644
--- a/drivers/video/tegra/host/host1x/host1x.c
+++ b/drivers/video/tegra/host/host1x/host1x.c
@@ -52,8 +52,24 @@ static int power_off_host(struct platform_device *dev)
return 0;
}
+static void clock_on_host(struct platform_device *dev)
+{
+ struct nvhost_device_data *pdata = platform_get_drvdata(dev);
+ struct nvhost_master *host = nvhost_get_private_data(dev);
+ nvhost_intr_start(&host->intr, clk_get_rate(pdata->clk[0]));
+}
+
+static int clock_off_host(struct platform_device *dev)
+{
+ struct nvhost_master *host = nvhost_get_private_data(dev);
+ nvhost_intr_stop(&host->intr);
+ return 0;
+}
+
static void nvhost_free_resources(struct nvhost_master *host)
{
+ kfree(host->intr.syncpt);
+ host->intr.syncpt = 0;
}
static int __devinit nvhost_alloc_resources(struct nvhost_master *host)
@@ -64,6 +80,16 @@ static int __devinit nvhost_alloc_resources(struct nvhost_master *host)
if (err)
return err;
+ host->intr.syncpt = devm_kzalloc(&host->dev->dev,
+ sizeof(struct nvhost_intr_syncpt) *
+ nvhost_syncpt_nb_pts(&host->syncpt),
+ GFP_KERNEL);
+
+ if (!host->intr.syncpt) {
+ /* frees happen in the support removal phase */
+ return -ENOMEM;
+ }
+
return 0;
}
@@ -99,6 +125,8 @@ static int __devinit nvhost_probe(struct platform_device *dev)
pdata->finalize_poweron = power_on_host;
pdata->prepare_poweroff = power_off_host;
+ pdata->prepare_clockoff = clock_off_host;
+ pdata->finalize_clockon = clock_on_host;
pdata->pdev = dev;
@@ -125,6 +153,10 @@ static int __devinit nvhost_probe(struct platform_device *dev)
if (err)
goto fail;
+ err = nvhost_intr_init(&host->intr, intr1->start, intr0->start);
+ if (err)
+ goto fail;
+
err = nvhost_module_init(dev);
if (err)
goto fail;
@@ -148,6 +180,7 @@ fail:
static int __exit nvhost_remove(struct platform_device *dev)
{
struct nvhost_master *host = nvhost_get_private_data(dev);
+ nvhost_intr_deinit(&host->intr);
nvhost_syncpt_deinit(&host->syncpt);
nvhost_module_deinit(dev);
nvhost_free_resources(host);
diff --git a/drivers/video/tegra/host/host1x/host1x.h b/drivers/video/tegra/host/host1x/host1x.h
index 76748ac..af9bfef 100644
--- a/drivers/video/tegra/host/host1x/host1x.h
+++ b/drivers/video/tegra/host/host1x/host1x.h
@@ -25,6 +25,7 @@
#include <linux/nvhost.h>
#include "nvhost_syncpt.h"
+#include "nvhost_intr.h"
#define TRACE_MAX_LENGTH 128U
#define IFACE_NAME "nvhost"
@@ -33,6 +34,7 @@ struct nvhost_master {
void __iomem *aperture;
void __iomem *sync_aperture;
struct nvhost_syncpt syncpt;
+ struct nvhost_intr intr;
struct platform_device *dev;
struct host1x_device_info info;
};
diff --git a/drivers/video/tegra/host/host1x/host1x01.c b/drivers/video/tegra/host/host1x/host1x01.c
index d53302d..5bf0e6e 100644
--- a/drivers/video/tegra/host/host1x/host1x01.c
+++ b/drivers/video/tegra/host/host1x/host1x01.c
@@ -26,12 +26,14 @@
#include "chip_support.h"
#include "host1x/host1x_syncpt.c"
+#include "host1x/host1x_intr.c"
int nvhost_init_host1x01_support(struct nvhost_master *host,
struct nvhost_chip_support *op)
{
host->sync_aperture = host->aperture + HOST1X_CHANNEL_SYNC_REG_BASE;
op->syncpt = host1x_syncpt_ops;
+ op->intr = host1x_intr_ops;
return 0;
}
diff --git a/drivers/video/tegra/host/host1x/host1x_intr.c b/drivers/video/tegra/host/host1x/host1x_intr.c
new file mode 100644
index 0000000..94f08cb
--- /dev/null
+++ b/drivers/video/tegra/host/host1x/host1x_intr.c
@@ -0,0 +1,263 @@
+/*
+ * drivers/video/tegra/host/host1x/host1x_intr.c
+ *
+ * Tegra host1x Interrupt Management
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Copyright (c) 2010-2012, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <asm/mach/irq.h>
+
+#include "nvhost_intr.h"
+#include "host1x/host1x.h"
+
+/* Spacing between sync registers */
+#define REGISTER_STRIDE 4
+
+static void host1x_intr_syncpt_thresh_isr(struct nvhost_intr_syncpt *syncpt);
+
+static void syncpt_thresh_cascade_fn(struct work_struct *work)
+{
+ struct nvhost_intr_syncpt *sp =
+ container_of(work, struct nvhost_intr_syncpt, work);
+ nvhost_syncpt_thresh_fn(sp->irq, sp);
+}
+
+static irqreturn_t syncpt_thresh_cascade_isr(int irq, void *dev_id)
+{
+ struct nvhost_master *dev = dev_id;
+ void __iomem *sync_regs = dev->sync_aperture;
+ struct nvhost_intr *intr = &dev->intr;
+ unsigned long reg;
+ int i, id;
+
+ for (i = 0; i < dev->info.nb_pts / BITS_PER_LONG; i++) {
+ reg = readl(sync_regs +
+ host1x_sync_syncpt_thresh_cpu0_int_status_r() +
+ i * REGISTER_STRIDE);
+ for_each_set_bit(id, ®, BITS_PER_LONG) {
+ struct nvhost_intr_syncpt *sp =
+ intr->syncpt + (i * BITS_PER_LONG + id);
+ host1x_intr_syncpt_thresh_isr(sp);
+ queue_work(intr->wq, &sp->work);
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void host1x_intr_init_host_sync(struct nvhost_intr *intr)
+{
+ struct nvhost_master *dev = intr_to_dev(intr);
+ void __iomem *sync_regs = dev->sync_aperture;
+ int i, err, irq;
+
+ writel(0xffffffffUL,
+ sync_regs + host1x_sync_syncpt_thresh_int_disable_r());
+ writel(0xffffffffUL,
+ sync_regs + host1x_sync_syncpt_thresh_cpu0_int_status_r());
+
+ for (i = 0; i < dev->info.nb_pts; i++)
+ INIT_WORK(&intr->syncpt[i].work, syncpt_thresh_cascade_fn);
+
+ irq = platform_get_irq(dev->dev, 0);
+ WARN_ON(IS_ERR_VALUE(irq));
+ err = devm_request_irq(&dev->dev->dev, irq,
+ syncpt_thresh_cascade_isr,
+ IRQF_SHARED, "host_syncpt", dev);
+ WARN_ON(IS_ERR_VALUE(err));
+
+ /* disable the ip_busy_timeout. this prevents write drops, etc.
+ * there's no real way to recover from a hung client anyway.
+ */
+ writel(0, sync_regs + host1x_sync_ip_busy_timeout_r());
+
+ /* increase the auto-ack timout to the maximum value. 2d will hang
+ * otherwise on Tegra2.
+ */
+ writel(0xff, sync_regs + host1x_sync_ctxsw_timeout_cfg_r());
+}
+
+static void host1x_intr_set_host_clocks_per_usec(struct nvhost_intr *intr,
+ u32 cpm)
+{
+ struct nvhost_master *dev = intr_to_dev(intr);
+ void __iomem *sync_regs = dev->sync_aperture;
+ /* write microsecond clock register */
+ writel(cpm, sync_regs + host1x_sync_usec_clk_r());
+}
+
+static void host1x_intr_set_syncpt_threshold(struct nvhost_intr *intr,
+ u32 id, u32 thresh)
+{
+ struct nvhost_master *dev = intr_to_dev(intr);
+ void __iomem *sync_regs = dev->sync_aperture;
+ writel(thresh, sync_regs +
+ (host1x_sync_syncpt_int_thresh_0_r() + id * REGISTER_STRIDE));
+}
+
+static void host1x_intr_enable_syncpt_intr(struct nvhost_intr *intr, u32 id)
+{
+ struct nvhost_master *dev = intr_to_dev(intr);
+ void __iomem *sync_regs = dev->sync_aperture;
+
+ writel(BIT_MASK(id), sync_regs +
+ host1x_sync_syncpt_thresh_int_enable_cpu0_r() +
+ BIT_WORD(id) * REGISTER_STRIDE);
+}
+
+static void host1x_intr_disable_syncpt_intr(struct nvhost_intr *intr, u32 id)
+{
+ struct nvhost_master *dev = intr_to_dev(intr);
+ void __iomem *sync_regs = dev->sync_aperture;
+
+ writel(BIT_MASK(id), sync_regs +
+ host1x_sync_syncpt_thresh_int_disable_r() +
+ BIT_WORD(id) * REGISTER_STRIDE);
+
+ writel(BIT_MASK(id), sync_regs +
+ host1x_sync_syncpt_thresh_cpu0_int_status_r() +
+ BIT_WORD(id) * REGISTER_STRIDE);
+}
+
+static void host1x_intr_disable_all_syncpt_intrs(struct nvhost_intr *intr)
+{
+ struct nvhost_master *dev = intr_to_dev(intr);
+ void __iomem *sync_regs = dev->sync_aperture;
+ u32 reg;
+
+ for (reg = 0; reg <= BIT_WORD(dev->info.nb_pts) * REGISTER_STRIDE;
+ reg += REGISTER_STRIDE) {
+ writel(0xffffffffu, sync_regs +
+ host1x_sync_syncpt_thresh_int_disable_r() +
+ reg);
+
+ writel(0xffffffffu, sync_regs +
+ host1x_sync_syncpt_thresh_cpu0_int_status_r() + reg);
+ }
+}
+
+/**
+ * Sync point threshold interrupt service function
+ * Handles sync point threshold triggers, in interrupt context
+ */
+static void host1x_intr_syncpt_thresh_isr(struct nvhost_intr_syncpt *syncpt)
+{
+ unsigned int id = syncpt->id;
+ struct nvhost_intr *intr = intr_syncpt_to_intr(syncpt);
+
+ void __iomem *sync_regs = intr_to_dev(intr)->sync_aperture;
+
+ u32 reg = BIT_WORD(id) * REGISTER_STRIDE;
+
+ writel(BIT_MASK(id), sync_regs +
+ host1x_sync_syncpt_thresh_int_disable_r() + reg);
+ writel(BIT_MASK(id), sync_regs +
+ host1x_sync_syncpt_thresh_cpu0_int_status_r() + reg);
+}
+
+/**
+ * Host general interrupt service function
+ * Handles read / write failures
+ */
+static irqreturn_t host1x_intr_host1x_isr(int irq, void *dev_id)
+{
+ struct nvhost_intr *intr = dev_id;
+ void __iomem *sync_regs = intr_to_dev(intr)->sync_aperture;
+ u32 stat;
+ u32 ext_stat;
+ u32 addr;
+
+ stat = readl(sync_regs + host1x_sync_hintstatus_r());
+ ext_stat = readl(sync_regs + host1x_sync_hintstatus_ext_r());
+
+ if (host1x_sync_hintstatus_ext_ip_read_int_v(ext_stat)) {
+ addr = readl(sync_regs + host1x_sync_ip_read_timeout_addr_r());
+ pr_err("Host read timeout at address %x\n", addr);
+ }
+
+ if (host1x_sync_hintstatus_ext_ip_write_int_v(ext_stat)) {
+ addr = readl(sync_regs + host1x_sync_ip_write_timeout_addr_r());
+ pr_err("Host write timeout at address %x\n", addr);
+ }
+
+ writel(ext_stat, sync_regs + host1x_sync_hintstatus_ext_r());
+ writel(stat, sync_regs + host1x_sync_hintstatus_r());
+
+ return IRQ_HANDLED;
+}
+static int host1x_intr_request_host_general_irq(struct nvhost_intr *intr)
+{
+ void __iomem *sync_regs = intr_to_dev(intr)->sync_aperture;
+ int err;
+
+ /* master disable for general (not syncpt) host interrupts */
+ writel(0, sync_regs + host1x_sync_intmask_r());
+
+ /* clear status & extstatus */
+ writel(0xfffffffful, sync_regs + host1x_sync_hintstatus_ext_r());
+ writel(0xfffffffful, sync_regs + host1x_sync_hintstatus_r());
+
+ err = request_irq(intr->host_general_irq, host1x_intr_host1x_isr, 0,
+ "host_status", intr);
+ if (err)
+ return err;
+
+ /* enable extra interrupt sources IP_READ_INT and IP_WRITE_INT */
+ writel(BIT(30) | BIT(31), sync_regs + host1x_sync_hintmask_ext_r());
+
+ /* enable extra interrupt sources */
+ writel(BIT(12) | BIT(31), sync_regs + host1x_sync_hintmask_r());
+
+ /* enable host module interrupt to CPU0 */
+ writel(BIT(0), sync_regs + host1x_sync_intc0mask_r());
+
+ /* master enable for general (not syncpt) host interrupts */
+ writel(BIT(0), sync_regs + host1x_sync_intmask_r());
+
+ return err;
+}
+
+static void host1x_intr_free_host_general_irq(struct nvhost_intr *intr)
+{
+ void __iomem *sync_regs = intr_to_dev(intr)->sync_aperture;
+
+ /* master disable for general (not syncpt) host interrupts */
+ writel(0, sync_regs + host1x_sync_intmask_r());
+
+ free_irq(intr->host_general_irq, intr);
+}
+
+static int host1x_free_syncpt_irq(struct nvhost_intr *intr)
+{
+ flush_workqueue(intr->wq);
+ return 0;
+}
+
+static const struct nvhost_intr_ops host1x_intr_ops = {
+ .init_host_sync = host1x_intr_init_host_sync,
+ .set_host_clocks_per_usec = host1x_intr_set_host_clocks_per_usec,
+ .set_syncpt_threshold = host1x_intr_set_syncpt_threshold,
+ .enable_syncpt_intr = host1x_intr_enable_syncpt_intr,
+ .disable_syncpt_intr = host1x_intr_disable_syncpt_intr,
+ .disable_all_syncpt_intrs = host1x_intr_disable_all_syncpt_intrs,
+ .request_host_general_irq = host1x_intr_request_host_general_irq,
+ .free_host_general_irq = host1x_intr_free_host_general_irq,
+ .free_syncpt_irq = host1x_free_syncpt_irq,
+};
diff --git a/drivers/video/tegra/host/nvhost_intr.c b/drivers/video/tegra/host/nvhost_intr.c
new file mode 100644
index 0000000..35dd7bb
--- /dev/null
+++ b/drivers/video/tegra/host/nvhost_intr.c
@@ -0,0 +1,363 @@
+/*
+ * drivers/video/tegra/host/nvhost_intr.c
+ *
+ * Tegra host1x Interrupt Management
+ *
+ * Copyright (c) 2010-2012, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "nvhost_intr.h"
+#include "nvhost_acm.h"
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+#include "chip_support.h"
+#include "host1x/host1x.h"
+
+/*** Wait list management ***/
+
+struct nvhost_waitlist {
+ struct list_head list;
+ struct kref refcount;
+ u32 thresh;
+ enum nvhost_intr_action action;
+ atomic_t state;
+ void *data;
+ int count;
+};
+
+enum waitlist_state {
+ WLS_PENDING,
+ WLS_REMOVED,
+ WLS_CANCELLED,
+ WLS_HANDLED
+};
+
+static void waiter_release(struct kref *kref)
+{
+ kfree(container_of(kref, struct nvhost_waitlist, refcount));
+}
+
+/**
+ * add a waiter to a waiter queue, sorted by threshold
+ * returns true if it was added at the head of the queue
+ */
+static bool add_waiter_to_queue(struct nvhost_waitlist *waiter,
+ struct list_head *queue)
+{
+ struct nvhost_waitlist *pos;
+ u32 thresh = waiter->thresh;
+
+ list_for_each_entry_reverse(pos, queue, list)
+ if ((s32)(pos->thresh - thresh) <= 0) {
+ list_add(&waiter->list, &pos->list);
+ return false;
+ }
+
+ list_add(&waiter->list, queue);
+ return true;
+}
+
+/**
+ * run through a waiter queue for a single sync point ID
+ * and gather all completed waiters into lists by actions
+ */
+static void remove_completed_waiters(struct list_head *head, u32 sync,
+ struct list_head completed[NVHOST_INTR_ACTION_COUNT])
+{
+ struct list_head *dest;
+ struct nvhost_waitlist *waiter, *next;
+
+ list_for_each_entry_safe(waiter, next, head, list) {
+ if ((s32)(waiter->thresh - sync) > 0)
+ break;
+
+ dest = completed + waiter->action;
+
+ /* PENDING->REMOVED or CANCELLED->HANDLED */
+ if (atomic_inc_return(&waiter->state) == WLS_HANDLED || !dest) {
+ list_del(&waiter->list);
+ kref_put(&waiter->refcount, waiter_release);
+ } else {
+ list_move_tail(&waiter->list, dest);
+ }
+ }
+}
+
+void reset_threshold_interrupt(struct nvhost_intr *intr,
+ struct list_head *head,
+ unsigned int id)
+{
+ u32 thresh = list_first_entry(head,
+ struct nvhost_waitlist, list)->thresh;
+
+ intr_op().set_syncpt_threshold(intr, id, thresh);
+ intr_op().enable_syncpt_intr(intr, id);
+}
+
+
+static void action_wakeup(struct nvhost_waitlist *waiter)
+{
+ wait_queue_head_t *wq = waiter->data;
+
+ wake_up(wq);
+}
+
+static void action_wakeup_interruptible(struct nvhost_waitlist *waiter)
+{
+ wait_queue_head_t *wq = waiter->data;
+
+ wake_up_interruptible(wq);
+}
+
+typedef void (*action_handler)(struct nvhost_waitlist *waiter);
+
+static action_handler action_handlers[NVHOST_INTR_ACTION_COUNT] = {
+ action_wakeup,
+ action_wakeup_interruptible,
+};
+
+static void run_handlers(struct list_head completed[NVHOST_INTR_ACTION_COUNT])
+{
+ struct list_head *head = completed;
+ int i;
+
+ for (i = 0; i < NVHOST_INTR_ACTION_COUNT; ++i, ++head) {
+ action_handler handler = action_handlers[i];
+ struct nvhost_waitlist *waiter, *next;
+
+ list_for_each_entry_safe(waiter, next, head, list) {
+ list_del(&waiter->list);
+ handler(waiter);
+ WARN_ON(atomic_xchg(&waiter->state, WLS_HANDLED)
+ != WLS_REMOVED);
+ kref_put(&waiter->refcount, waiter_release);
+ }
+ }
+}
+
+/**
+ * Remove & handle all waiters that have completed for the given syncpt
+ */
+static int process_wait_list(struct nvhost_intr *intr,
+ struct nvhost_intr_syncpt *syncpt,
+ u32 threshold)
+{
+ struct list_head completed[NVHOST_INTR_ACTION_COUNT];
+ unsigned int i;
+ int empty;
+
+ for (i = 0; i < NVHOST_INTR_ACTION_COUNT; ++i)
+ INIT_LIST_HEAD(completed + i);
+
+ spin_lock(&syncpt->lock);
+
+ remove_completed_waiters(&syncpt->wait_head, threshold, completed);
+
+ empty = list_empty(&syncpt->wait_head);
+ if (empty)
+ intr_op().disable_syncpt_intr(intr, syncpt->id);
+ else
+ reset_threshold_interrupt(intr, &syncpt->wait_head,
+ syncpt->id);
+
+ spin_unlock(&syncpt->lock);
+
+ run_handlers(completed);
+
+ return empty;
+}
+
+/*** host syncpt interrupt service functions ***/
+/**
+ * Sync point threshold interrupt service thread function
+ * Handles sync point threshold triggers, in thread context
+ */
+irqreturn_t nvhost_syncpt_thresh_fn(int irq, void *dev_id)
+{
+ struct nvhost_intr_syncpt *syncpt = dev_id;
+ unsigned int id = syncpt->id;
+ struct nvhost_intr *intr = intr_syncpt_to_intr(syncpt);
+ struct nvhost_master *dev = intr_to_dev(intr);
+
+ (void)process_wait_list(intr, syncpt,
+ nvhost_syncpt_update_min(&dev->syncpt, id));
+
+ return IRQ_HANDLED;
+}
+
+/*** host general interrupt service functions ***/
+
+
+/*** Main API ***/
+
+int nvhost_intr_add_action(struct nvhost_intr *intr, u32 id, u32 thresh,
+ enum nvhost_intr_action action, void *data,
+ void *_waiter,
+ void **ref)
+{
+ struct nvhost_waitlist *waiter = _waiter;
+ struct nvhost_intr_syncpt *syncpt;
+ int queue_was_empty;
+
+ if (waiter == NULL) {
+ pr_warn("%s: NULL waiter\n", __func__);
+ return -EINVAL;
+ }
+
+ /* initialize a new waiter */
+ INIT_LIST_HEAD(&waiter->list);
+ kref_init(&waiter->refcount);
+ if (ref)
+ kref_get(&waiter->refcount);
+ waiter->thresh = thresh;
+ waiter->action = action;
+ atomic_set(&waiter->state, WLS_PENDING);
+ waiter->data = data;
+ waiter->count = 1;
+
+ syncpt = intr->syncpt + id;
+
+ spin_lock(&syncpt->lock);
+
+ queue_was_empty = list_empty(&syncpt->wait_head);
+
+ if (add_waiter_to_queue(waiter, &syncpt->wait_head)) {
+ /* added at head of list - new threshold value */
+ intr_op().set_syncpt_threshold(intr, id, thresh);
+
+ /* added as first waiter - enable interrupt */
+ if (queue_was_empty)
+ intr_op().enable_syncpt_intr(intr, id);
+ }
+
+ spin_unlock(&syncpt->lock);
+
+ if (ref)
+ *ref = waiter;
+ return 0;
+}
+
+void *nvhost_intr_alloc_waiter()
+{
+ return kzalloc(sizeof(struct nvhost_waitlist),
+ GFP_KERNEL|__GFP_REPEAT);
+}
+
+void nvhost_intr_put_ref(struct nvhost_intr *intr, u32 id, void *ref)
+{
+ struct nvhost_waitlist *waiter = ref;
+ struct nvhost_intr_syncpt *syncpt;
+ struct nvhost_master *host = intr_to_dev(intr);
+
+ while (atomic_cmpxchg(&waiter->state,
+ WLS_PENDING, WLS_CANCELLED) == WLS_REMOVED)
+ schedule();
+
+ syncpt = intr->syncpt + id;
+ (void)process_wait_list(intr, syncpt,
+ nvhost_syncpt_update_min(&host->syncpt, id));
+
+ kref_put(&waiter->refcount, waiter_release);
+}
+
+
+/*** Init & shutdown ***/
+
+int nvhost_intr_init(struct nvhost_intr *intr, u32 irq_gen, u32 irq_sync)
+{
+ unsigned int id;
+ struct nvhost_intr_syncpt *syncpt;
+ struct nvhost_master *host = intr_to_dev(intr);
+ u32 nb_pts = nvhost_syncpt_nb_pts(&host->syncpt);
+
+ mutex_init(&intr->mutex);
+ intr->host_syncpt_irq_base = irq_sync;
+ intr->wq = create_workqueue("host_syncpt");
+ intr_op().init_host_sync(intr);
+ intr->host_general_irq = irq_gen;
+ intr_op().request_host_general_irq(intr);
+
+ for (id = 0, syncpt = intr->syncpt;
+ id < nb_pts;
+ ++id, ++syncpt) {
+ syncpt->intr = &host->intr;
+ syncpt->id = id;
+ syncpt->irq = irq_sync + id;
+ spin_lock_init(&syncpt->lock);
+ INIT_LIST_HEAD(&syncpt->wait_head);
+ snprintf(syncpt->thresh_irq_name,
+ sizeof(syncpt->thresh_irq_name),
+ "host_sp_%02d", id);
+ }
+
+ return 0;
+}
+
+void nvhost_intr_deinit(struct nvhost_intr *intr)
+{
+ nvhost_intr_stop(intr);
+ destroy_workqueue(intr->wq);
+}
+
+void nvhost_intr_start(struct nvhost_intr *intr, u32 hz)
+{
+ mutex_lock(&intr->mutex);
+
+ intr_op().init_host_sync(intr);
+ intr_op().set_host_clocks_per_usec(intr,
+ (hz + 1000000 - 1)/1000000);
+
+ intr_op().request_host_general_irq(intr);
+
+ mutex_unlock(&intr->mutex);
+}
+
+void nvhost_intr_stop(struct nvhost_intr *intr)
+{
+ unsigned int id;
+ struct nvhost_intr_syncpt *syncpt;
+ u32 nb_pts = nvhost_syncpt_nb_pts(&intr_to_dev(intr)->syncpt);
+
+ mutex_lock(&intr->mutex);
+
+ intr_op().disable_all_syncpt_intrs(intr);
+
+ for (id = 0, syncpt = intr->syncpt;
+ id < nb_pts;
+ ++id, ++syncpt) {
+ struct nvhost_waitlist *waiter, *next;
+ list_for_each_entry_safe(waiter, next,
+ &syncpt->wait_head, list) {
+ if (atomic_cmpxchg(&waiter->state,
+ WLS_CANCELLED, WLS_HANDLED)
+ == WLS_CANCELLED) {
+ list_del(&waiter->list);
+ kref_put(&waiter->refcount, waiter_release);
+ }
+ }
+
+ if (!list_empty(&syncpt->wait_head)) { /* output diagnostics */
+ pr_warn("%s cannot stop syncpt intr id=%d\n",
+ __func__, id);
+ return;
+ }
+ }
+
+ intr_op().free_host_general_irq(intr);
+ intr_op().free_syncpt_irq(intr);
+
+ mutex_unlock(&intr->mutex);
+}
diff --git a/drivers/video/tegra/host/nvhost_intr.h b/drivers/video/tegra/host/nvhost_intr.h
new file mode 100644
index 0000000..31b0a38
--- /dev/null
+++ b/drivers/video/tegra/host/nvhost_intr.h
@@ -0,0 +1,102 @@
+/*
+ * drivers/video/tegra/host/nvhost_intr.h
+ *
+ * Tegra host1x Interrupt Management
+ *
+ * Copyright (c) 2010-2012, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __NVHOST_INTR_H
+#define __NVHOST_INTR_H
+
+#include <linux/kthread.h>
+#include <linux/semaphore.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+
+enum nvhost_intr_action {
+ /**
+ * Wake up a task.
+ * 'data' points to a wait_queue_head_t
+ */
+ NVHOST_INTR_ACTION_WAKEUP,
+
+ /**
+ * Wake up a interruptible task.
+ * 'data' points to a wait_queue_head_t
+ */
+ NVHOST_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
+
+ NVHOST_INTR_ACTION_COUNT
+};
+
+struct nvhost_intr;
+
+struct nvhost_intr_syncpt {
+ struct nvhost_intr *intr;
+ u8 id;
+ u16 irq;
+ spinlock_t lock;
+ struct list_head wait_head;
+ char thresh_irq_name[12];
+ struct work_struct work;
+};
+
+struct nvhost_intr {
+ struct nvhost_intr_syncpt *syncpt;
+ struct mutex mutex;
+ int host_general_irq;
+ int host_syncpt_irq_base;
+ struct workqueue_struct *wq;
+};
+#define intr_to_dev(x) container_of(x, struct nvhost_master, intr)
+#define intr_syncpt_to_intr(is) (is->intr)
+
+/**
+ * Schedule an action to be taken when a sync point reaches the given threshold.
+ *
+ * @id the sync point
+ * @thresh the threshold
+ * @action the action to take
+ * @data a pointer to extra data depending on action, see above
+ * @waiter waiter allocated with nvhost_intr_alloc_waiter - assumes ownership
+ * @ref must be passed if cancellation is possible, else NULL
+ *
+ * This is a non-blocking api.
+ */
+int nvhost_intr_add_action(struct nvhost_intr *intr, u32 id, u32 thresh,
+ enum nvhost_intr_action action, void *data,
+ void *waiter,
+ void **ref);
+
+/**
+ * Allocate a waiter.
+ */
+void *nvhost_intr_alloc_waiter(void);
+
+/**
+ * Unreference an action submitted to nvhost_intr_add_action().
+ * You must call this if you passed non-NULL as ref.
+ * @ref the ref returned from nvhost_intr_add_action()
+ */
+void nvhost_intr_put_ref(struct nvhost_intr *intr, u32 id, void *ref);
+
+int nvhost_intr_init(struct nvhost_intr *intr, u32 irq_gen, u32 irq_sync);
+void nvhost_intr_deinit(struct nvhost_intr *intr);
+void nvhost_intr_start(struct nvhost_intr *intr, u32 hz);
+void nvhost_intr_stop(struct nvhost_intr *intr);
+
+irqreturn_t nvhost_syncpt_thresh_fn(int irq, void *dev_id);
+#endif
diff --git a/drivers/video/tegra/host/nvhost_syncpt.c b/drivers/video/tegra/host/nvhost_syncpt.c
index d7c8230..6ef0ba4 100644
--- a/drivers/video/tegra/host/nvhost_syncpt.c
+++ b/drivers/video/tegra/host/nvhost_syncpt.c
@@ -123,6 +123,117 @@ void nvhost_syncpt_incr(struct nvhost_syncpt *sp, u32 id)
}
/**
+ * Updated sync point form hardware, and returns true if syncpoint is expired,
+ * false if we may need to wait
+ */
+static bool syncpt_update_min_is_expired(
+ struct nvhost_syncpt *sp,
+ u32 id,
+ u32 thresh)
+{
+ syncpt_op().update_min(sp, id);
+ return nvhost_syncpt_is_expired(sp, id, thresh);
+}
+
+/**
+ * Main entrypoint for syncpoint value waits.
+ */
+int nvhost_syncpt_wait_timeout(struct nvhost_syncpt *sp, u32 id,
+ u32 thresh, u32 timeout, u32 *value)
+{
+ DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
+ void *ref;
+ void *waiter;
+ int err = 0, check_count = 0, low_timeout = 0;
+ u32 val;
+
+ if (value)
+ *value = 0;
+
+ /* first check cache */
+ if (nvhost_syncpt_is_expired(sp, id, thresh)) {
+ if (value)
+ *value = nvhost_syncpt_read_min(sp, id);
+ return 0;
+ }
+
+ /* keep host alive */
+ nvhost_module_busy(syncpt_to_dev(sp)->dev);
+
+ /* try to read from register */
+ val = syncpt_op().update_min(sp, id);
+ if (nvhost_syncpt_is_expired(sp, id, thresh)) {
+ if (value)
+ *value = val;
+ goto done;
+ }
+
+ if (!timeout) {
+ err = -EAGAIN;
+ goto done;
+ }
+
+ /* schedule a wakeup when the syncpoint value is reached */
+ waiter = nvhost_intr_alloc_waiter();
+ if (!waiter) {
+ err = -ENOMEM;
+ goto done;
+ }
+
+ err = nvhost_intr_add_action(&(syncpt_to_dev(sp)->intr), id, thresh,
+ NVHOST_INTR_ACTION_WAKEUP_INTERRUPTIBLE, &wq,
+ waiter,
+ &ref);
+ if (err)
+ goto done;
+
+ err = -EAGAIN;
+ /* Caller-specified timeout may be impractically low */
+ if (timeout < SYNCPT_CHECK_PERIOD)
+ low_timeout = timeout;
+
+ /* wait for the syncpoint, or timeout, or signal */
+ while (timeout) {
+ u32 check = min_t(u32, SYNCPT_CHECK_PERIOD, timeout);
+ int remain = wait_event_interruptible_timeout(wq,
+ syncpt_update_min_is_expired(sp, id, thresh),
+ check);
+ if (remain > 0 || nvhost_syncpt_is_expired(sp, id, thresh)) {
+ if (value)
+ *value = nvhost_syncpt_read_min(sp, id);
+ err = 0;
+ break;
+ }
+ if (remain < 0) {
+ err = remain;
+ break;
+ }
+ if (timeout != NVHOST_NO_TIMEOUT)
+ timeout -= check;
+ if (timeout && check_count <= MAX_STUCK_CHECK_COUNT) {
+ dev_warn(&syncpt_to_dev(sp)->dev->dev,
+ "%s: syncpoint id %d (%s) stuck waiting %d, timeout=%d\n",
+ current->comm, id, syncpt_op().name(sp, id),
+ thresh, timeout);
+ syncpt_op().debug(sp);
+ if (check_count == MAX_STUCK_CHECK_COUNT) {
+ if (low_timeout) {
+ dev_warn(&syncpt_to_dev(sp)->dev->dev,
+ "is timeout %d too low?\n",
+ low_timeout);
+ }
+ }
+ check_count++;
+ }
+ }
+ nvhost_intr_put_ref(&(syncpt_to_dev(sp)->intr), id, ref);
+
+done:
+ nvhost_module_idle(syncpt_to_dev(sp)->dev);
+ return err;
+}
+
+/**
* Returns true if syncpoint is expired, false if we may need to wait
*/
bool nvhost_syncpt_is_expired(
diff --git a/drivers/video/tegra/host/nvhost_syncpt.h b/drivers/video/tegra/host/nvhost_syncpt.h
index b883442..dbd3890 100644
--- a/drivers/video/tegra/host/nvhost_syncpt.h
+++ b/drivers/video/tegra/host/nvhost_syncpt.h
@@ -126,6 +126,16 @@ u32 nvhost_syncpt_read_wait_base(struct nvhost_syncpt *sp, u32 id);
void nvhost_syncpt_incr(struct nvhost_syncpt *sp, u32 id);
+int nvhost_syncpt_wait_timeout(struct nvhost_syncpt *sp, u32 id, u32 thresh,
+ u32 timeout, u32 *value);
+
+static inline int nvhost_syncpt_wait(struct nvhost_syncpt *sp,
+ u32 id, u32 thresh)
+{
+ return nvhost_syncpt_wait_timeout(sp, id, thresh,
+ MAX_SCHEDULE_TIMEOUT, NULL);
+}
+
void nvhost_syncpt_debug(struct nvhost_syncpt *sp);
static inline int nvhost_syncpt_is_valid(struct nvhost_syncpt *sp, u32 id)
diff --git a/include/linux/nvhost.h b/include/linux/nvhost.h
index 20ba2a5..745f31c 100644
--- a/include/linux/nvhost.h
+++ b/include/linux/nvhost.h
@@ -35,6 +35,7 @@ struct nvhost_device_power_attr;
#define NVHOST_DEFAULT_CLOCKGATE_DELAY .clockgate_delay = 25
#define NVHOST_NAME_SIZE 24
#define NVSYNCPT_INVALID (-1)
+#define NVHOST_NO_TIMEOUT (-1)
enum nvhost_power_sysfs_attributes {
NVHOST_POWER_SYSFS_ATTRIB_CLOCKGATE_DELAY = 0,
@@ -139,5 +140,6 @@ void host1x_idle(struct platform_device *dev);
u32 host1x_syncpt_incr_max(u32 id, u32 incrs);
void host1x_syncpt_incr(u32 id);
u32 host1x_syncpt_read(u32 id);
+int host1x_syncpt_wait(u32 id, u32 thresh, u32 timeout, u32 *value);
#endif
--
1.7.9.5
--
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