Some nit-picks inline.
On 2018-12-12 11:09 p.m., Evan Quan wrote:
> We need new invalidation engine layout due to new SDMA page
> queues added.
>
> Change-Id: I2f3861689bffb9828c9eae744a7a0de4963ac2b6
> Signed-off-by: Evan Quan <evan.q...@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 47 ++++++++++++++-------------
> drivers/gpu/drm/amd/amdgpu/gmc_v9_0.h | 10 ++++++
> 2 files changed, 35 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> index dc4dadc3575c..092a4d111557 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> @@ -719,37 +719,40 @@ static bool gmc_v9_0_keep_stolen_memory(struct
> amdgpu_device *adev)
> }
> }
>
> -static int gmc_v9_0_late_init(void *handle)
> +static int gmc_v9_0_allocate_vm_inv_eng(struct amdgpu_device *adev)
The function returns int. But only ever returns 0 and the caller ignores
the return value.
> {
> - struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> - /*
> - * 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 };
> + struct amdgpu_ring *ring;
> + unsigned vm_inv_engs[AMDGPU_MAX_VMHUBS] =
> + {GFXHUB_FREE_VM_INV_ENGS_BITMAP, MMHUB_FREE_VM_INV_ENGS_BITMAP};
> unsigned i;
> - int r;
> + unsigned vmhub, inv_eng;
>
> - if (!gmc_v9_0_keep_stolen_memory(adev))
> - amdgpu_bo_late_init(adev);
> + for (i = 0; i < adev->num_rings; ++i) {
> + ring = adev->rings[i];
> + vmhub = ring->funcs->vmhub;
> +
> + inv_eng = ffs(vm_inv_engs[vmhub]);
> + BUG_ON(!inv_eng);
Adding new BUG_ONs is discouraged. checkpatch.pl always warns about
these. Errors that can be handled more gracefully shouldn't use a
BUG_ON. E.g. use a WARN_ON and return an error code.
>
> - for(i = 0; i < adev->num_rings; ++i) {
> - struct amdgpu_ring *ring = adev->rings[i];
> - unsigned vmhub = ring->funcs->vmhub;
> + ring->vm_inv_eng = inv_eng - 1;
> + change_bit(inv_eng - 1, (unsigned long *)(&vm_inv_engs[vmhub]));
>
> - ring->vm_inv_eng = vm_inv_eng[vmhub]++;
> dev_info(adev->dev, "ring %s uses VM inv eng %u on hub %u\n",
> ring->name, ring->vm_inv_eng, ring->funcs->vmhub);
> }
>
> - /* 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] > 16);
> + return 0;
This is the only return statement. Maybe this could be a void function.
Unless you decide to turn the BUG_ON into a WARN with an error return.
> +}
> +
> +static int gmc_v9_0_late_init(void *handle)
> +{
> + struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> + int r;
> +
> + if (!gmc_v9_0_keep_stolen_memory(adev))
> + amdgpu_bo_late_init(adev);
> +
> + gmc_v9_0_allocate_vm_inv_eng(adev);
You're ignoring the return value. Either, make the function void, or
handle potential error returns.
Regards,
Felix
>
> if (adev->asic_type == CHIP_VEGA10 && !amdgpu_sriov_vf(adev)) {
> r = gmc_v9_0_ecc_available(adev);
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.h
> b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.h
> index b030ca5ea107..5c8deac65580 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.h
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.h
> @@ -24,6 +24,16 @@
> #ifndef __GMC_V9_0_H__
> #define __GMC_V9_0_H__
>
> + /*
> + * The latest engine allocation on gfx9 is:
> + * Engine 2, 3: firmware
> + * Engine 0, 1, 4~16: amdgpu ring,
> + * subject to change when ring number changes
> + * Engine 17: Gart flushes
> + */
> +#define GFXHUB_FREE_VM_INV_ENGS_BITMAP 0x1FFF3
> +#define MMHUB_FREE_VM_INV_ENGS_BITMAP 0x1FFF3
> +
> extern const struct amd_ip_funcs gmc_v9_0_ip_funcs;
> extern const struct amdgpu_ip_block_version gmc_v9_0_ip_block;
>
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