[PATCH 1/4] drm/amdgpu: Adding new kgd/kfd interface functions to support scratch memory
Marek Olšák
maraeo at gmail.com
Tue Aug 15 10:07:29 UTC 2017
Mesa doesn't use flat scratch.
Marek
On Tue, Aug 15, 2017 at 3:12 AM, Felix Kuehling <felix.kuehling at amd.com> wrote:
> [+Marek, Alex for comment, see below]
>
> On 2017-08-13 04:56 AM, Oded Gabbay wrote:
>> On Sat, Aug 12, 2017 at 7:47 AM, Felix Kuehling <Felix.Kuehling at amd.com> wrote:
>>> From: Moses Reuben <moses.reuben at amd.com>
>>>
>>> Signed-off-by: Moses Reuben <moses.reuben at amd.com>
>>> Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
>>> ---
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c | 34 +++++++++++++++++++++-
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c | 35 ++++++++++++++++++++++-
>>> drivers/gpu/drm/amd/include/kgd_kfd_interface.h | 4 +++
>>> 3 files changed, 71 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c
>>> index 994d262..11d515a 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c
>>> @@ -135,6 +135,10 @@ static uint16_t get_atc_vmid_pasid_mapping_pasid(struct kgd_dev *kgd,
>>> static void write_vmid_invalidate_request(struct kgd_dev *kgd, uint8_t vmid);
>>>
>>> static uint16_t get_fw_version(struct kgd_dev *kgd, enum kgd_engine_type type);
>>> +static int alloc_memory_of_scratch(struct kgd_dev *kgd,
>>> + uint64_t va, uint32_t vmid);
>>> +static int write_config_static_mem(struct kgd_dev *kgd, bool swizzle_enable,
>>> + uint8_t element_size, uint8_t index_stride, uint8_t mtype);
>>>
>>> static const struct kfd2kgd_calls kfd2kgd = {
>>> .init_gtt_mem_allocation = alloc_gtt_mem,
>>> @@ -159,7 +163,9 @@ static const struct kfd2kgd_calls kfd2kgd = {
>>> .get_atc_vmid_pasid_mapping_pasid = get_atc_vmid_pasid_mapping_pasid,
>>> .get_atc_vmid_pasid_mapping_valid = get_atc_vmid_pasid_mapping_valid,
>>> .write_vmid_invalidate_request = write_vmid_invalidate_request,
>>> - .get_fw_version = get_fw_version
>>> + .get_fw_version = get_fw_version,
>>> + .alloc_memory_of_scratch = alloc_memory_of_scratch,
>>> + .write_config_static_mem = write_config_static_mem
>>> };
>>>
>>> struct kfd2kgd_calls *amdgpu_amdkfd_gfx_7_get_functions(void)
>>> @@ -652,6 +658,32 @@ static void write_vmid_invalidate_request(struct kgd_dev *kgd, uint8_t vmid)
>>> WREG32(mmVM_INVALIDATE_REQUEST, 1 << vmid);
>>> }
>>>
>>> +static int write_config_static_mem(struct kgd_dev *kgd, bool swizzle_enable,
>>> + uint8_t element_size, uint8_t index_stride, uint8_t mtype)
>>> +{
>>> + uint32_t reg;
>>> + struct amdgpu_device *adev = (struct amdgpu_device *) kgd;
>>> +
>>> + reg = swizzle_enable << SH_STATIC_MEM_CONFIG__SWIZZLE_ENABLE__SHIFT |
>>> + element_size << SH_STATIC_MEM_CONFIG__ELEMENT_SIZE__SHIFT |
>>> + index_stride << SH_STATIC_MEM_CONFIG__INDEX_STRIDE__SHIFT |
>>> + mtype << SH_STATIC_MEM_CONFIG__PRIVATE_MTYPE__SHIFT;
>>> +
>>> + WREG32(mmSH_STATIC_MEM_CONFIG, reg);
>> Don't you need to select and lock srbm before you write to this register ?
>
> No, this register seems to be global. SRBM_GFX_CNTL had no effect on it
> when I experimented with it.
>
> Since this is global initialization, I'm wondering if this should be
> moved into part of the amdgpu initialization. Having amdkfd call back
> into amdgpu like this during its initialization always seemed like a bit
> roundabout.
>
> Marek, do you know if this register affects Mesa performance or
> behaviour with respect to scratch memory. According to the register spec
> it only affects flat scratch memory addressing. Not sure if you're using
> that addressing scheme in Mesa.
>
> Alex, I see that SH_STATIC_MEM_CONFIG gets initialized in
> gfx_v[78]_0_gpu_init identically to what we do in KFD. You're doing it
> per-VMID (under cik_srbm_select). But my experiments show that this
> register is global. So I think your initialization already works for KFD
> and we can probably just drop this from the KFD initialization. Do you
> have access to hardware docs that confirm that it's global?
>
> Regards,
> Felix
>
>>
>>> + return 0;
>>> +}
>>> +static int alloc_memory_of_scratch(struct kgd_dev *kgd,
>>> + uint64_t va, uint32_t vmid)
>>> +{
>>> + struct amdgpu_device *adev = (struct amdgpu_device *) kgd;
>>> +
>>> + lock_srbm(kgd, 0, 0, 0, vmid);
>>> + WREG32(mmSH_HIDDEN_PRIVATE_BASE_VMID, va);
>>> + unlock_srbm(kgd);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> static uint16_t get_fw_version(struct kgd_dev *kgd, enum kgd_engine_type type)
>>> {
>>> struct amdgpu_device *adev = (struct amdgpu_device *) kgd;
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c
>>> index 29a6f5d..ef677e5 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c
>>> @@ -94,6 +94,10 @@ static uint16_t get_atc_vmid_pasid_mapping_pasid(struct kgd_dev *kgd,
>>> uint8_t vmid);
>>> static void write_vmid_invalidate_request(struct kgd_dev *kgd, uint8_t vmid);
>>> static uint16_t get_fw_version(struct kgd_dev *kgd, enum kgd_engine_type type);
>>> +static int alloc_memory_of_scratch(struct kgd_dev *kgd,
>>> + uint64_t va, uint32_t vmid);
>>> +static int write_config_static_mem(struct kgd_dev *kgd, bool swizzle_enable,
>>> + uint8_t element_size, uint8_t index_stride, uint8_t mtype);
>>>
>>> static const struct kfd2kgd_calls kfd2kgd = {
>>> .init_gtt_mem_allocation = alloc_gtt_mem,
>>> @@ -120,12 +124,15 @@ static const struct kfd2kgd_calls kfd2kgd = {
>>> .get_atc_vmid_pasid_mapping_valid =
>>> get_atc_vmid_pasid_mapping_valid,
>>> .write_vmid_invalidate_request = write_vmid_invalidate_request,
>>> - .get_fw_version = get_fw_version
>>> + .get_fw_version = get_fw_version,
>>> + .alloc_memory_of_scratch = alloc_memory_of_scratch,
>>> + .write_config_static_mem = write_config_static_mem
>>> };
>>>
>>> struct kfd2kgd_calls *amdgpu_amdkfd_gfx_8_0_get_functions(void)
>>> {
>>> return (struct kfd2kgd_calls *)&kfd2kgd;
>>> + return (struct kfd2kgd_calls *)&kfd2kgd;
>>> }
>>>
>>> static inline struct amdgpu_device *get_amdgpu_device(struct kgd_dev *kgd)
>>> @@ -573,6 +580,32 @@ static uint32_t kgd_address_watch_get_offset(struct kgd_dev *kgd,
>>> return 0;
>>> }
>>>
>>> +static int write_config_static_mem(struct kgd_dev *kgd, bool swizzle_enable,
>>> + uint8_t element_size, uint8_t index_stride, uint8_t mtype)
>>> +{
>>> + uint32_t reg;
>>> + struct amdgpu_device *adev = (struct amdgpu_device *) kgd;
>>> +
>>> + reg = swizzle_enable << SH_STATIC_MEM_CONFIG__SWIZZLE_ENABLE__SHIFT |
>>> + element_size << SH_STATIC_MEM_CONFIG__ELEMENT_SIZE__SHIFT |
>>> + index_stride << SH_STATIC_MEM_CONFIG__INDEX_STRIDE__SHIFT |
>>> + mtype << SH_STATIC_MEM_CONFIG__PRIVATE_MTYPE__SHIFT;
>>> +
>>> + WREG32(mmSH_STATIC_MEM_CONFIG, reg);
>> Same comment as above.
>>
>>> + return 0;
>>> +}
>>> +static int alloc_memory_of_scratch(struct kgd_dev *kgd,
>>> + uint64_t va, uint32_t vmid)
>>> +{
>>> + struct amdgpu_device *adev = (struct amdgpu_device *) kgd;
>>> +
>>> + lock_srbm(kgd, 0, 0, 0, vmid);
>>> + WREG32(mmSH_HIDDEN_PRIVATE_BASE_VMID, va);
>>> + unlock_srbm(kgd);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> static uint16_t get_fw_version(struct kgd_dev *kgd, enum kgd_engine_type type)
>>> {
>>> struct amdgpu_device *adev = (struct amdgpu_device *) kgd;
>>> diff --git a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
>>> index ffafda0..1dd90b2 100644
>>> --- a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
>>> +++ b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
>>> @@ -199,6 +199,10 @@ struct kfd2kgd_calls {
>>>
>>> uint16_t (*get_fw_version)(struct kgd_dev *kgd,
>>> enum kgd_engine_type type);
>>> + int (*alloc_memory_of_scratch)(struct kgd_dev *kgd,
>>> + uint64_t va, uint32_t vmid);
>>> + int (*write_config_static_mem)(struct kgd_dev *kgd, bool swizzle_enable,
>>> + uint8_t element_size, uint8_t index_stride, uint8_t mtype);
>>> };
>>>
>>> /**
>>> --
>>> 2.7.4
>>>
>
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