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gpu: nvgpu: l2 invalidate/flush for off devices

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When doing l2 invalidate or l2 flush, first check if the hw is powered
on. If it is not, nothing is done, as there are no hardware registers
available. As a side-effect, this may race so that the hardware stays
unrailgated.

Change-Id: I8bdbfcee3545355435d4ae01476188eb1b8b8817
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/594441
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Konsta Holtta
2014-11-05 17:18:28 +02:00
committed by Dan Willemsen
parent e22d0082ec
commit 28f4e53e74
1 changed files with 14 additions and 3 deletions
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17
drivers/gpu/nvgpu/gk20a/mm_gk20a.c
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@@ -2950,9 +2950,13 @@ static void gk20a_mm_l2_invalidate_locked(struct gk20a *g)
void gk20a_mm_l2_invalidate(struct gk20a *g)
{
struct mm_gk20a *mm = &g->mm;
mutex_lock(&mm->l2_op_lock);
gk20a_mm_l2_invalidate_locked(g);
mutex_unlock(&mm->l2_op_lock);
gk20a_busy_noresume(g->dev);
if (g->power_on) {
mutex_lock(&mm->l2_op_lock);
gk20a_mm_l2_invalidate_locked(g);
mutex_unlock(&mm->l2_op_lock);
}
pm_runtime_put_noidle(&g->dev->dev);
}
void gk20a_mm_l2_flush(struct gk20a *g, bool invalidate)
@@ -2963,6 +2967,10 @@ void gk20a_mm_l2_flush(struct gk20a *g, bool invalidate)
gk20a_dbg_fn("");
gk20a_busy_noresume(g->dev);
if (!g->power_on)
goto hw_was_off;
mutex_lock(&mm->l2_op_lock);
/* Flush all dirty lines from the L2 to DRAM. Lines are left in the L2
@@ -2992,6 +3000,9 @@ void gk20a_mm_l2_flush(struct gk20a *g, bool invalidate)
gk20a_mm_l2_invalidate_locked(g);
mutex_unlock(&mm->l2_op_lock);
hw_was_off:
pm_runtime_put_noidle(&g->dev->dev);
}