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Subject[PATCH 4.14 65/95] drm/amdgpu: Properly allocate VM invalidate eng v2
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: ozeng <oak.zeng@amd.com>

commit c5066129af4436ab0da8eefe4289774a5409706d upstream.

v1: Properly allocate TLB invalidation engine to avoid conflict.
v2: Added comments to codes

Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Christian Konig <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -395,7 +395,16 @@ static int gmc_v9_0_early_init(void *han
static int gmc_v9_0_late_init(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
- unsigned vm_inv_eng[AMDGPU_MAX_VMHUBS] = { 3, 3 };
+ /*
+ * The latest engine allocation on gfx9 is:
+ * Engine 0, 1: idle
+ * Engine 2, 3: firmware
+ * Engine 4~13: amdgpu ring, subject to change when ring number changes
+ * Engine 14~15: idle
+ * Engine 16: kfd tlb invalidation
+ * Engine 17: Gart flushes
+ */
+ unsigned vm_inv_eng[AMDGPU_MAX_VMHUBS] = { 4, 4 };
unsigned i;

for(i = 0; i < adev->num_rings; ++i) {
@@ -408,9 +417,9 @@ static int gmc_v9_0_late_init(void *hand
ring->funcs->vmhub);
}

- /* Engine 17 is used for GART flushes */
+ /* Engine 16 is used for KFD and 17 for GART flushes */
for(i = 0; i < AMDGPU_MAX_VMHUBS; ++i)
- BUG_ON(vm_inv_eng[i] > 17);
+ BUG_ON(vm_inv_eng[i] > 16);

return amdgpu_irq_get(adev, &adev->mc.vm_fault, 0);
}

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