gpu: nvgpu: add channel enable/disable ioctls

Add below ioctls for channels

1. NVHOST_IOCTL_CHANNEL_ENABLE
   To enable the channel

2. NVHOST_IOCTL_CHANNEL_DISABLE
   To disable the channel

3. NVHOST_IOCTL_CHANNEL_PREEMPT
   To preempt the channel
   (Not supported for a channel in TSG)

Bug 1514064

Change-Id: Ie9315f9742bb27efb22f993799c51a1ecda91756
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/449229
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 5bb62dd3..f7cafc52 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -2264,6 +2264,48 @@ long gk20a_channel_ioctl(struct file *filp,
                         ((struct nvhost_set_priority_args *)buf)->priority);
                 gk20a_idle(dev);
                 break;
+        case NVHOST_IOCTL_CHANNEL_ENABLE:
+                err = gk20a_busy(dev);
+                if (err) {
+                        dev_err(&dev->dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        return err;
+                }
+                /* enable channel */
+                gk20a_writel(ch->g, ccsr_channel_r(ch->hw_chid),
+                        gk20a_readl(ch->g, ccsr_channel_r(ch->hw_chid)) |
+                        ccsr_channel_enable_set_true_f());
+                gk20a_idle(dev);
+                break;
+        case NVHOST_IOCTL_CHANNEL_DISABLE:
+                err = gk20a_busy(dev);
+                if (err) {
+                        dev_err(&dev->dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        return err;
+                }
+                /* disable channel */
+                gk20a_writel(ch->g, ccsr_channel_r(ch->hw_chid),
+                        gk20a_readl(ch->g, ccsr_channel_r(ch->hw_chid)) |
+                        ccsr_channel_enable_clr_true_f());
+                gk20a_idle(dev);
+                break;
+        case NVHOST_IOCTL_CHANNEL_PREEMPT:
+                if (gk20a_is_channel_marked_as_tsg(ch))
+                        return -EINVAL;
+                err = gk20a_busy(dev);
+                if (err) {
+                        dev_err(&dev->dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        return err;
+                }
+                /* preempt channel */
+                err = gk20a_fifo_preempt_channel(ch->g, ch->hw_chid);
+                gk20a_idle(dev);
+                break;
         default:
                 dev_err(&dev->dev, "unrecognized ioctl cmd: 0x%x", cmd);
                 err = -ENOTTY;