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Subject[PATCHv2 2/4] gpu: host1x: Add syncpoint base support
Date
This patch adds support for hardware syncpoint bases. This creates
a simple mechanism to stall the command FIFO until an operation is
completed.

Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
---
drivers/gpu/host1x/dev.h | 2 ++
drivers/gpu/host1x/hw/channel_hw.c | 19 +++++++++++++
drivers/gpu/host1x/hw/hw_host1x01_uclass.h | 6 ++++
drivers/gpu/host1x/syncpt.c | 44 ++++++++++++++++++++++++++++--
drivers/gpu/host1x/syncpt.h | 7 +++++
5 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
index bed90a8..516ce0a 100644
--- a/drivers/gpu/host1x/dev.h
+++ b/drivers/gpu/host1x/dev.h
@@ -27,6 +27,7 @@
#include "job.h"

struct host1x_syncpt;
+struct host1x_syncpt_base;
struct host1x_channel;
struct host1x_cdma;
struct host1x_job;
@@ -102,6 +103,7 @@ struct host1x {

void __iomem *regs;
struct host1x_syncpt *syncpt;
+ struct host1x_syncpt_base *bases;
struct device *dev;
struct clk *clk;

diff --git a/drivers/gpu/host1x/hw/channel_hw.c b/drivers/gpu/host1x/hw/channel_hw.c
index ee19962..06f44bf 100644
--- a/drivers/gpu/host1x/hw/channel_hw.c
+++ b/drivers/gpu/host1x/hw/channel_hw.c
@@ -67,6 +67,21 @@ static void submit_gathers(struct host1x_job *job)
}
}

+static inline void synchronize_syncpt_base(struct host1x_job *job)
+{
+ struct host1x_channel *ch = job->channel;
+ struct host1x *host = dev_get_drvdata(ch->dev->parent);
+ struct host1x_syncpt *sp = host->syncpt + job->syncpt_id;
+ u32 base_id = sp->base->id;
+ u32 base_val = host1x_syncpt_read_max(sp);
+
+ host1x_cdma_push(&ch->cdma,
+ host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
+ HOST1X_UCLASS_LOAD_SYNCPT_BASE, 1),
+ HOST1X_UCLASS_LOAD_SYNCPT_BASE_BASE_INDX_F(base_id) |
+ HOST1X_UCLASS_LOAD_SYNCPT_BASE_VALUE_F(base_val));
+}
+
static int channel_submit(struct host1x_job *job)
{
struct host1x_channel *ch = job->channel;
@@ -118,6 +133,10 @@ static int channel_submit(struct host1x_job *job)
host1x_syncpt_read_max(sp)));
}

+ /* Synchronize base register to allow using it for relative waiting */
+ if (sp->base)
+ synchronize_syncpt_base(job);
+
syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);

job->syncpt_end = syncval;
diff --git a/drivers/gpu/host1x/hw/hw_host1x01_uclass.h b/drivers/gpu/host1x/hw/hw_host1x01_uclass.h
index 42f3ce1..f755359 100644
--- a/drivers/gpu/host1x/hw/hw_host1x01_uclass.h
+++ b/drivers/gpu/host1x/hw/hw_host1x01_uclass.h
@@ -111,6 +111,12 @@ static inline u32 host1x_uclass_wait_syncpt_base_offset_f(u32 v)
}
#define HOST1X_UCLASS_WAIT_SYNCPT_BASE_OFFSET_F(v) \
host1x_uclass_wait_syncpt_base_offset_f(v)
+static inline u32 host1x_uclass_load_syncpt_base_r(void)
+{
+ return 0xb;
+}
+#define HOST1X_UCLASS_LOAD_SYNCPT_BASE \
+ host1x_uclass_load_syncpt_base_r()
static inline u32 host1x_uclass_load_syncpt_base_base_indx_f(u32 v)
{
return (v & 0xff) << 24;
diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c
index d376cd4..b5cb97c 100644
--- a/drivers/gpu/host1x/syncpt.c
+++ b/drivers/gpu/host1x/syncpt.c
@@ -30,6 +30,28 @@
#define SYNCPT_CHECK_PERIOD (2 * HZ)
#define MAX_STUCK_CHECK_COUNT 15

+static struct host1x_syncpt_base *host1x_base_alloc(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;
+}
+
static struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,
struct device *dev,
unsigned long flags)
@@ -44,6 +66,12 @@ static struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,
if (i >= host->info->nb_pts)
return NULL;

+ if (flags & HOST1X_SYNCPT_HAS_BASE) {
+ sp->base = host1x_base_alloc(host);
+ if (!sp->base)
+ return NULL;
+ }
+
name = kasprintf(GFP_KERNEL, "%02d-%s", sp->id,
dev ? dev_name(dev) : NULL);
if (!name)
@@ -304,19 +332,29 @@ int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr)
int host1x_syncpt_init(struct host1x *host)
{
struct host1x_syncpt *syncpt;
+ struct host1x_syncpt_base *bases;
int i;

syncpt = devm_kzalloc(host->dev, sizeof(*syncpt) * host->info->nb_pts,
- GFP_KERNEL);
+ GFP_KERNEL);
if (!syncpt)
return -ENOMEM;

- for (i = 0; i < host->info->nb_pts; ++i) {
+ bases = devm_kzalloc(host->dev, sizeof(*bases) * host->info->nb_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;
+
host->syncpt = syncpt;
+ host->bases = bases;

host1x_syncpt_restore(host);

@@ -340,7 +378,9 @@ void host1x_syncpt_free(struct host1x_syncpt *sp)
if (!sp)
return;

+ host1x_syncpt_base_free(sp->base);
kfree(sp->name);
+ sp->base = NULL;
sp->dev = NULL;
sp->name = NULL;
sp->client_managed = false;
diff --git a/drivers/gpu/host1x/syncpt.h b/drivers/gpu/host1x/syncpt.h
index 1de7b58..28ec886 100644
--- a/drivers/gpu/host1x/syncpt.h
+++ b/drivers/gpu/host1x/syncpt.h
@@ -30,6 +30,11 @@ struct host1x;
/* Reserved for replacing an expired wait with a NOP */
#define HOST1X_SYNCPT_RESERVED 0

+struct host1x_syncpt_base {
+ unsigned int id;
+ bool requested;
+};
+
struct host1x_syncpt {
int id;
atomic_t min_val;
@@ -39,6 +44,7 @@ struct host1x_syncpt {
bool client_managed;
struct host1x *host;
struct device *dev;
+ struct host1x_syncpt_base *base;

/* interrupt data */
struct host1x_syncpt_intr intr;
@@ -154,6 +160,7 @@ u32 host1x_syncpt_id(struct host1x_syncpt *sp);

/* Allocate a sync point for a device. */
#define HOST1X_SYNCPT_CLIENT_MANAGED (1 << 0)
+#define HOST1X_SYNCPT_HAS_BASE (1 << 1)
struct host1x_syncpt *host1x_syncpt_request(struct device *dev,
unsigned long flags);

--
1.8.1.5


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