* [PATCH] drm/amdgpu: Fix VM clean check method
@ 2019-04-30 14:18 Trigger Huang
[not found] ` <1556633912-27698-1-git-send-email-Trigger.Huang-5C7GfCeVMHo@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Trigger Huang @ 2019-04-30 14:18 UTC (permalink / raw)
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW; +Cc: Trigger.Huang-5C7GfCeVMHo
amdgpu_vm_make_compute is used to turn a GFX VM into a compute VM,
the prerequisite is this VM is clean. Let's check if some page tables
are already filled , while not check if some mapping is already made.
Signed-off-by: Trigger Huang <Trigger.Huang@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 36 +++++++++++++++++++++++++++++++++-
1 file changed, 35 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 56d838f..6752d4c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2755,6 +2755,40 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
}
/**
+ * amdgpu_vm_check_clean_reserved - check if a VM is clean
+ *
+ * @adev: amdgpu_device pointer
+ * @vm: the VM to check
+ *
+ * check all entries of the root PD, if any subsequent PDs are allocated,
+ * it means there are page table creating and filling, and is no a clean
+ * VM
+ *
+ * Returns:
+ * 0 if this VM is clean
+ */
+static int amdgpu_vm_check_clean_reserved(struct amdgpu_device *adev,
+ struct amdgpu_vm *vm)
+{
+ int ret = 0;
+
+ if (vm->root.entries) {
+ unsigned int i = 0;
+ enum amdgpu_vm_level l = adev->vm_manager.root_level;
+ unsigned int entries = amdgpu_vm_num_entries(adev, l);
+
+ for (i = 0; i < entries; i++) {
+ if (vm->root.entries[i].base.bo) {
+ ret = -EINVAL;
+ break;
+ }
+ }
+ }
+
+ return ret;
+}
+
+/**
* amdgpu_vm_make_compute - Turn a GFX VM into a compute VM
*
* @adev: amdgpu_device pointer
@@ -2784,7 +2818,7 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm, uns
return r;
/* Sanity checks */
- if (!RB_EMPTY_ROOT(&vm->va.rb_root) || vm->root.entries) {
+ if (amdgpu_vm_check_clean_reserved(adev, vm)) {
r = -EINVAL;
goto unreserve_bo;
}
--
2.7.4
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] drm/amdgpu: Fix VM clean check method
[not found] ` <1556633912-27698-1-git-send-email-Trigger.Huang-5C7GfCeVMHo@public.gmane.org>
@ 2019-04-30 14:29 ` Christian König
0 siblings, 0 replies; 2+ messages in thread
From: Christian König @ 2019-04-30 14:29 UTC (permalink / raw)
To: Trigger Huang, amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW
Am 30.04.19 um 16:18 schrieb Trigger Huang:
> amdgpu_vm_make_compute is used to turn a GFX VM into a compute VM,
> the prerequisite is this VM is clean. Let's check if some page tables
> are already filled , while not check if some mapping is already made.
>
> Signed-off-by: Trigger Huang <Trigger.Huang@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 36 +++++++++++++++++++++++++++++++++-
> 1 file changed, 35 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 56d838f..6752d4c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -2755,6 +2755,40 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
> }
>
> /**
> + * amdgpu_vm_check_clean_reserved - check if a VM is clean
> + *
> + * @adev: amdgpu_device pointer
> + * @vm: the VM to check
> + *
> + * check all entries of the root PD, if any subsequent PDs are allocated,
> + * it means there are page table creating and filling, and is no a clean
> + * VM
> + *
> + * Returns:
> + * 0 if this VM is clean
> + */
> +static int amdgpu_vm_check_clean_reserved(struct amdgpu_device *adev,
> + struct amdgpu_vm *vm)
> +{
> + int ret = 0;
> +
> + if (vm->root.entries) {
Use an early return here.
> + unsigned int i = 0;
> + enum amdgpu_vm_level l = adev->vm_manager.root_level;
> + unsigned int entries = amdgpu_vm_num_entries(adev, l);
And coding style usually uses reverse x-mas tree, e.g. stuff like "i" or
"ret" last.
Christian.
> +
> + for (i = 0; i < entries; i++) {
> + if (vm->root.entries[i].base.bo) {
> + ret = -EINVAL;
> + break;
> + }
> + }
> + }
> +
> + return ret;
> +}
> +
> +/**
> * amdgpu_vm_make_compute - Turn a GFX VM into a compute VM
> *
> * @adev: amdgpu_device pointer
> @@ -2784,7 +2818,7 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm, uns
> return r;
>
> /* Sanity checks */
> - if (!RB_EMPTY_ROOT(&vm->va.rb_root) || vm->root.entries) {
> + if (amdgpu_vm_check_clean_reserved(adev, vm)) {
> r = -EINVAL;
> goto unreserve_bo;
> }
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2019-04-30 14:18 [PATCH] drm/amdgpu: Fix VM clean check method Trigger Huang
[not found] ` <1556633912-27698-1-git-send-email-Trigger.Huang-5C7GfCeVMHo@public.gmane.org>
2019-04-30 14:29 ` Christian König
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