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Subject[PATCH 2/3] drm/vc4: Allocate/liberate the binner BO at firstopen/lastclose
Date
Since the binner buffer is only required for GPU rendering, it's a waste
to allocate it when the driver probes since internal users of the driver
(such as fbcon) won't try to use the GPU.

Move the allocation/liberation to the firstopen/lastclose to only
allocate it when userspace has opened the device.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
drivers/gpu/drm/vc4/vc4_drv.c | 26 ++++++++++++++++++++++++++
drivers/gpu/drm/vc4/vc4_drv.h | 1 +
drivers/gpu/drm/vc4/vc4_irq.c | 3 +++
drivers/gpu/drm/vc4/vc4_v3d.c | 8 +-------
4 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 3227706700f9..605dc50613e3 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -134,6 +134,30 @@ static void vc4_close(struct drm_device *dev, struct drm_file *file)
kfree(vc4file);
}

+static int vc4_firstopen(struct drm_device *drm)
+{
+ struct vc4_dev *vc4 = to_vc4_dev(drm);
+ int ret;
+
+ if (!vc4->bin_bo) {
+ ret = vc4_allocate_bin_bo(drm);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void vc4_lastclose(struct drm_device *drm)
+{
+ struct vc4_dev *vc4 = to_vc4_dev(drm);
+
+ if (vc4->bin_bo) {
+ drm_gem_object_put_unlocked(&vc4->bin_bo->base.base);
+ vc4->bin_bo = NULL;
+ }
+}
+
static const struct vm_operations_struct vc4_vm_ops = {
.fault = vc4_fault,
.open = drm_gem_vm_open,
@@ -180,6 +204,8 @@ static struct drm_driver vc4_drm_driver = {
DRIVER_SYNCOBJ),
.open = vc4_open,
.postclose = vc4_close,
+ .firstopen = vc4_firstopen,
+ .lastclose = vc4_lastclose,
.irq_handler = vc4_irq,
.irq_preinstall = vc4_irq_preinstall,
.irq_postinstall = vc4_irq_postinstall,
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 7a3c093e7443..f52bb21e9885 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -808,6 +808,7 @@ extern struct platform_driver vc4_v3d_driver;
int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused);
int vc4_v3d_debugfs_regs(struct seq_file *m, void *unused);
int vc4_v3d_get_bin_slot(struct vc4_dev *vc4);
+int vc4_allocate_bin_bo(struct drm_device *drm);

/* vc4_validate.c */
int
diff --git a/drivers/gpu/drm/vc4/vc4_irq.c b/drivers/gpu/drm/vc4/vc4_irq.c
index 4cd2ccfe15f4..efaba2b02f6c 100644
--- a/drivers/gpu/drm/vc4/vc4_irq.c
+++ b/drivers/gpu/drm/vc4/vc4_irq.c
@@ -64,6 +64,9 @@ vc4_overflow_mem_work(struct work_struct *work)
struct vc4_exec_info *exec;
unsigned long irqflags;

+ if (!bo)
+ return;
+
bin_bo_slot = vc4_v3d_get_bin_slot(vc4);
if (bin_bo_slot < 0) {
DRM_ERROR("Couldn't allocate binner overflow mem\n");
diff --git a/drivers/gpu/drm/vc4/vc4_v3d.c b/drivers/gpu/drm/vc4/vc4_v3d.c
index e47e29426078..ab15e71df001 100644
--- a/drivers/gpu/drm/vc4/vc4_v3d.c
+++ b/drivers/gpu/drm/vc4/vc4_v3d.c
@@ -218,7 +218,7 @@ int vc4_v3d_get_bin_slot(struct vc4_dev *vc4)
* overall CMA pool before they make scenes complicated enough to run
* out of bin space.
*/
-static int vc4_allocate_bin_bo(struct drm_device *drm)
+int vc4_allocate_bin_bo(struct drm_device *drm)
{
struct vc4_dev *vc4 = to_vc4_dev(drm);
struct vc4_v3d *v3d = vc4->v3d;
@@ -384,12 +384,6 @@ static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
if (ret != 0)
return ret;

- ret = vc4_allocate_bin_bo(drm);
- if (ret) {
- clk_disable_unprepare(v3d->clk);
- return ret;
- }
-
/* Reset the binner overflow address/size at setup, to be sure
* we don't reuse an old one.
*/
--
2.21.0
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