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path: root/drivers/gpu/host1x/syncpt.c
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Diffstat (limited to 'drivers/gpu/host1x/syncpt.c')
-rw-r--r--drivers/gpu/host1x/syncpt.c532
1 files changed, 532 insertions, 0 deletions
diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c
new file mode 100644
index 0000000000..f63d14a57a
--- /dev/null
+++ b/drivers/gpu/host1x/syncpt.c
@@ -0,0 +1,532 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Tegra host1x Syncpoints
+ *
+ * Copyright (c) 2010-2015, NVIDIA Corporation.
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/dma-fence.h>
+#include <linux/slab.h>
+
+#include <trace/events/host1x.h>
+
+#include "syncpt.h"
+#include "dev.h"
+#include "intr.h"
+#include "debug.h"
+
+#define SYNCPT_CHECK_PERIOD (2 * HZ)
+#define MAX_STUCK_CHECK_COUNT 15
+
+static struct host1x_syncpt_base *
+host1x_syncpt_base_request(struct host1x *host)
+{
+ struct host1x_syncpt_base *bases = host->bases;
+ unsigned int i;
+
+ for (i = 0; i < host->info->nb_bases; i++)
+ if (!bases[i].requested)
+ break;
+
+ if (i >= host->info->nb_bases)
+ return NULL;
+
+ bases[i].requested = true;
+ return &bases[i];
+}
+
+static void host1x_syncpt_base_free(struct host1x_syncpt_base *base)
+{
+ if (base)
+ base->requested = false;
+}
+
+/**
+ * host1x_syncpt_alloc() - allocate a syncpoint
+ * @host: host1x device data
+ * @flags: bitfield of HOST1X_SYNCPT_* flags
+ * @name: name for the syncpoint for use in debug prints
+ *
+ * Allocates a hardware syncpoint for the caller's use. The caller then has
+ * the sole authority to mutate the syncpoint's value until it is freed again.
+ *
+ * If no free syncpoints are available, or a NULL name was specified, returns
+ * NULL.
+ */
+struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,
+ unsigned long flags,
+ const char *name)
+{
+ struct host1x_syncpt *sp = host->syncpt;
+ char *full_name;
+ unsigned int i;
+
+ if (!name)
+ return NULL;
+
+ mutex_lock(&host->syncpt_mutex);
+
+ for (i = 0; i < host->info->nb_pts && kref_read(&sp->ref); i++, sp++)
+ ;
+
+ if (i >= host->info->nb_pts)
+ goto unlock;
+
+ if (flags & HOST1X_SYNCPT_HAS_BASE) {
+ sp->base = host1x_syncpt_base_request(host);
+ if (!sp->base)
+ goto unlock;
+ }
+
+ full_name = kasprintf(GFP_KERNEL, "%u-%s", sp->id, name);
+ if (!full_name)
+ goto free_base;
+
+ sp->name = full_name;
+
+ if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)
+ sp->client_managed = true;
+ else
+ sp->client_managed = false;
+
+ kref_init(&sp->ref);
+
+ mutex_unlock(&host->syncpt_mutex);
+ return sp;
+
+free_base:
+ host1x_syncpt_base_free(sp->base);
+ sp->base = NULL;
+unlock:
+ mutex_unlock(&host->syncpt_mutex);
+ return NULL;
+}
+EXPORT_SYMBOL(host1x_syncpt_alloc);
+
+/**
+ * host1x_syncpt_id() - retrieve syncpoint ID
+ * @sp: host1x syncpoint
+ *
+ * Given a pointer to a struct host1x_syncpt, retrieves its ID. This ID is
+ * often used as a value to program into registers that control how hardware
+ * blocks interact with syncpoints.
+ */
+u32 host1x_syncpt_id(struct host1x_syncpt *sp)
+{
+ return sp->id;
+}
+EXPORT_SYMBOL(host1x_syncpt_id);
+
+/**
+ * host1x_syncpt_incr_max() - update the value sent to hardware
+ * @sp: host1x syncpoint
+ * @incrs: number of increments
+ */
+u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
+{
+ return (u32)atomic_add_return(incrs, &sp->max_val);
+}
+EXPORT_SYMBOL(host1x_syncpt_incr_max);
+
+ /*
+ * Write cached syncpoint and waitbase values to hardware.
+ */
+void host1x_syncpt_restore(struct host1x *host)
+{
+ struct host1x_syncpt *sp_base = host->syncpt;
+ unsigned int i;
+
+ for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
+ /*
+ * Unassign syncpt from channels for purposes of Tegra186
+ * syncpoint protection. This prevents any channel from
+ * accessing it until it is reassigned.
+ */
+ host1x_hw_syncpt_assign_to_channel(host, sp_base + i, NULL);
+ host1x_hw_syncpt_restore(host, sp_base + i);
+ }
+
+ for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
+ host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
+
+ host1x_hw_syncpt_enable_protection(host);
+
+ wmb();
+}
+
+/*
+ * Update the cached syncpoint and waitbase values by reading them
+ * from the registers.
+ */
+void host1x_syncpt_save(struct host1x *host)
+{
+ struct host1x_syncpt *sp_base = host->syncpt;
+ unsigned int i;
+
+ for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
+ if (host1x_syncpt_client_managed(sp_base + i))
+ host1x_hw_syncpt_load(host, sp_base + i);
+ else
+ WARN_ON(!host1x_syncpt_idle(sp_base + i));
+ }
+
+ for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
+ host1x_hw_syncpt_load_wait_base(host, sp_base + i);
+}
+
+/*
+ * Updates the cached syncpoint value by reading a new value from the hardware
+ * register
+ */
+u32 host1x_syncpt_load(struct host1x_syncpt *sp)
+{
+ u32 val;
+
+ val = host1x_hw_syncpt_load(sp->host, sp);
+ trace_host1x_syncpt_load_min(sp->id, val);
+
+ return val;
+}
+
+/*
+ * Get the current syncpoint base
+ */
+u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
+{
+ host1x_hw_syncpt_load_wait_base(sp->host, sp);
+
+ return sp->base_val;
+}
+
+/**
+ * host1x_syncpt_incr() - increment syncpoint value from CPU, updating cache
+ * @sp: host1x syncpoint
+ */
+int host1x_syncpt_incr(struct host1x_syncpt *sp)
+{
+ return host1x_hw_syncpt_cpu_incr(sp->host, sp);
+}
+EXPORT_SYMBOL(host1x_syncpt_incr);
+
+/**
+ * host1x_syncpt_wait() - wait for a syncpoint to reach a given value
+ * @sp: host1x syncpoint
+ * @thresh: threshold
+ * @timeout: maximum time to wait for the syncpoint to reach the given value
+ * @value: return location for the syncpoint value
+ */
+int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
+ u32 *value)
+{
+ struct dma_fence *fence;
+ long wait_err;
+
+ host1x_hw_syncpt_load(sp->host, sp);
+
+ if (value)
+ *value = host1x_syncpt_load(sp);
+
+ if (host1x_syncpt_is_expired(sp, thresh))
+ return 0;
+
+ if (timeout < 0)
+ timeout = LONG_MAX;
+ else if (timeout == 0)
+ return -EAGAIN;
+
+ fence = host1x_fence_create(sp, thresh, false);
+ if (IS_ERR(fence))
+ return PTR_ERR(fence);
+
+ wait_err = dma_fence_wait_timeout(fence, true, timeout);
+ if (wait_err == 0)
+ host1x_fence_cancel(fence);
+ dma_fence_put(fence);
+
+ if (value)
+ *value = host1x_syncpt_load(sp);
+
+ /*
+ * Don't rely on dma_fence_wait_timeout return value,
+ * since it returns zero both on timeout and if the
+ * wait completed with 0 jiffies left.
+ */
+ host1x_hw_syncpt_load(sp->host, sp);
+ if (wait_err == 0 && !host1x_syncpt_is_expired(sp, thresh))
+ return -EAGAIN;
+ else if (wait_err < 0)
+ return wait_err;
+ else
+ return 0;
+}
+EXPORT_SYMBOL(host1x_syncpt_wait);
+
+/*
+ * Returns true if syncpoint is expired, false if we may need to wait
+ */
+bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
+{
+ u32 current_val;
+
+ smp_rmb();
+
+ current_val = (u32)atomic_read(&sp->min_val);
+
+ return ((current_val - thresh) & 0x80000000U) == 0U;
+}
+
+int host1x_syncpt_init(struct host1x *host)
+{
+ struct host1x_syncpt_base *bases;
+ struct host1x_syncpt *syncpt;
+ unsigned int i;
+
+ syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt),
+ GFP_KERNEL);
+ if (!syncpt)
+ return -ENOMEM;
+
+ bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),
+ GFP_KERNEL);
+ if (!bases)
+ return -ENOMEM;
+
+ for (i = 0; i < host->info->nb_pts; i++) {
+ syncpt[i].id = i;
+ syncpt[i].host = host;
+ }
+
+ for (i = 0; i < host->info->nb_bases; i++)
+ bases[i].id = i;
+
+ mutex_init(&host->syncpt_mutex);
+ host->syncpt = syncpt;
+ host->bases = bases;
+
+ /* Allocate sync point to use for clearing waits for expired fences */
+ host->nop_sp = host1x_syncpt_alloc(host, 0, "reserved-nop");
+ if (!host->nop_sp)
+ return -ENOMEM;
+
+ if (host->info->reserve_vblank_syncpts) {
+ kref_init(&host->syncpt[26].ref);
+ kref_init(&host->syncpt[27].ref);
+ }
+
+ return 0;
+}
+
+/**
+ * host1x_syncpt_request() - request a syncpoint
+ * @client: client requesting the syncpoint
+ * @flags: flags
+ *
+ * host1x client drivers can use this function to allocate a syncpoint for
+ * subsequent use. A syncpoint returned by this function will be reserved for
+ * use by the client exclusively. When no longer using a syncpoint, a host1x
+ * client driver needs to release it using host1x_syncpt_put().
+ */
+struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client,
+ unsigned long flags)
+{
+ struct host1x *host = dev_get_drvdata(client->host->parent);
+
+ return host1x_syncpt_alloc(host, flags, dev_name(client->dev));
+}
+EXPORT_SYMBOL(host1x_syncpt_request);
+
+static void syncpt_release(struct kref *ref)
+{
+ struct host1x_syncpt *sp = container_of(ref, struct host1x_syncpt, ref);
+
+ atomic_set(&sp->max_val, host1x_syncpt_read(sp));
+
+ sp->locked = false;
+
+ mutex_lock(&sp->host->syncpt_mutex);
+
+ host1x_syncpt_base_free(sp->base);
+ kfree(sp->name);
+ sp->base = NULL;
+ sp->name = NULL;
+ sp->client_managed = false;
+
+ mutex_unlock(&sp->host->syncpt_mutex);
+}
+
+/**
+ * host1x_syncpt_put() - free a requested syncpoint
+ * @sp: host1x syncpoint
+ *
+ * Release a syncpoint previously allocated using host1x_syncpt_request(). A
+ * host1x client driver should call this when the syncpoint is no longer in
+ * use.
+ */
+void host1x_syncpt_put(struct host1x_syncpt *sp)
+{
+ if (!sp)
+ return;
+
+ kref_put(&sp->ref, syncpt_release);
+}
+EXPORT_SYMBOL(host1x_syncpt_put);
+
+void host1x_syncpt_deinit(struct host1x *host)
+{
+ struct host1x_syncpt *sp = host->syncpt;
+ unsigned int i;
+
+ for (i = 0; i < host->info->nb_pts; i++, sp++)
+ kfree(sp->name);
+}
+
+/**
+ * host1x_syncpt_read_max() - read maximum syncpoint value
+ * @sp: host1x syncpoint
+ *
+ * The maximum syncpoint value indicates how many operations there are in
+ * queue, either in channel or in a software thread.
+ */
+u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
+{
+ smp_rmb();
+
+ return (u32)atomic_read(&sp->max_val);
+}
+EXPORT_SYMBOL(host1x_syncpt_read_max);
+
+/**
+ * host1x_syncpt_read_min() - read minimum syncpoint value
+ * @sp: host1x syncpoint
+ *
+ * The minimum syncpoint value is a shadow of the current sync point value in
+ * hardware.
+ */
+u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
+{
+ smp_rmb();
+
+ return (u32)atomic_read(&sp->min_val);
+}
+EXPORT_SYMBOL(host1x_syncpt_read_min);
+
+/**
+ * host1x_syncpt_read() - read the current syncpoint value
+ * @sp: host1x syncpoint
+ */
+u32 host1x_syncpt_read(struct host1x_syncpt *sp)
+{
+ return host1x_syncpt_load(sp);
+}
+EXPORT_SYMBOL(host1x_syncpt_read);
+
+unsigned int host1x_syncpt_nb_pts(struct host1x *host)
+{
+ return host->info->nb_pts;
+}
+
+unsigned int host1x_syncpt_nb_bases(struct host1x *host)
+{
+ return host->info->nb_bases;
+}
+
+unsigned int host1x_syncpt_nb_mlocks(struct host1x *host)
+{
+ return host->info->nb_mlocks;
+}
+
+/**
+ * host1x_syncpt_get_by_id() - obtain a syncpoint by ID
+ * @host: host1x controller
+ * @id: syncpoint ID
+ */
+struct host1x_syncpt *host1x_syncpt_get_by_id(struct host1x *host,
+ unsigned int id)
+{
+ if (id >= host->info->nb_pts)
+ return NULL;
+
+ if (kref_get_unless_zero(&host->syncpt[id].ref))
+ return &host->syncpt[id];
+ else
+ return NULL;
+}
+EXPORT_SYMBOL(host1x_syncpt_get_by_id);
+
+/**
+ * host1x_syncpt_get_by_id_noref() - obtain a syncpoint by ID but don't
+ * increase the refcount.
+ * @host: host1x controller
+ * @id: syncpoint ID
+ */
+struct host1x_syncpt *host1x_syncpt_get_by_id_noref(struct host1x *host,
+ unsigned int id)
+{
+ if (id >= host->info->nb_pts)
+ return NULL;
+
+ return &host->syncpt[id];
+}
+EXPORT_SYMBOL(host1x_syncpt_get_by_id_noref);
+
+/**
+ * host1x_syncpt_get() - increment syncpoint refcount
+ * @sp: syncpoint
+ */
+struct host1x_syncpt *host1x_syncpt_get(struct host1x_syncpt *sp)
+{
+ kref_get(&sp->ref);
+
+ return sp;
+}
+EXPORT_SYMBOL(host1x_syncpt_get);
+
+/**
+ * host1x_syncpt_get_base() - obtain the wait base associated with a syncpoint
+ * @sp: host1x syncpoint
+ */
+struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp)
+{
+ return sp ? sp->base : NULL;
+}
+EXPORT_SYMBOL(host1x_syncpt_get_base);
+
+/**
+ * host1x_syncpt_base_id() - retrieve the ID of a syncpoint wait base
+ * @base: host1x syncpoint wait base
+ */
+u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
+{
+ return base->id;
+}
+EXPORT_SYMBOL(host1x_syncpt_base_id);
+
+static void do_nothing(struct kref *ref)
+{
+}
+
+/**
+ * host1x_syncpt_release_vblank_reservation() - Make VBLANK syncpoint
+ * available for allocation
+ *
+ * @client: host1x bus client
+ * @syncpt_id: syncpoint ID to make available
+ *
+ * Makes VBLANK<i> syncpoint available for allocatation if it was
+ * reserved at initialization time. This should be called by the display
+ * driver after it has ensured that any VBLANK increment programming configured
+ * by the boot chain has been disabled.
+ */
+void host1x_syncpt_release_vblank_reservation(struct host1x_client *client,
+ u32 syncpt_id)
+{
+ struct host1x *host = dev_get_drvdata(client->host->parent);
+
+ if (!host->info->reserve_vblank_syncpts)
+ return;
+
+ kref_put(&host->syncpt[syncpt_id].ref, do_nothing);
+}
+EXPORT_SYMBOL(host1x_syncpt_release_vblank_reservation);