[PATCH libdrm] amdgpu: add a faster BO list API
Christian König
ckoenig.leichtzumerken at gmail.com
Wed Jan 16 14:43:15 UTC 2019
Am 16.01.19 um 15:39 schrieb Marek Olšák:
>
>
> On Wed, Jan 16, 2019, 9:34 AM Koenig, Christian
> <Christian.Koenig at amd.com <mailto:Christian.Koenig at amd.com> wrote:
>
> Am 16.01.19 um 15:31 schrieb Marek Olšák:
>>
>>
>> On Wed, Jan 16, 2019, 7:55 AM Christian König
>> <ckoenig.leichtzumerken at gmail.com
>> <mailto:ckoenig.leichtzumerken at gmail.com> wrote:
>>
>> Well if you ask me we should have the following interface for
>> negotiating memory management with the kernel:
>>
>> 1. We have per process BOs which can't be shared between
>> processes.
>>
>> Those are always valid and don't need to be mentioned in any
>> BO list
>> whatsoever.
>>
>> If we knew that a per process BO is currently not in use we can
>> optionally tell that to the kernel to make memory management
>> more efficient.
>>
>> In other words instead of a list of stuff which is used we
>> send down to
>> the kernel a list of stuff which is not used any more and
>> that only when
>> we know that it is necessary, e.g. when a game or application
>> overcommits.
>>
>>
>> Radeonsi doesn't use this because this approach caused
>> performance degradation and also drops BO priorities.
>
> The performance degradation where mostly shortcomings with the LRU
> which by now have been fixed.
>
> BO priorities are a different topic, but could be added to per VM
> BOs as well.
>
>
> What's the minimum drm version that contains the fixes?
I've pushed the last optimization this morning. No idea when it really
became useful, but the numbers from the closed source clients now look
much better.
We should probably test and bump the drm version when we are sure that
this now works as expected.
Christian.
>
> Marek
>
>
> Christian.
>
>>
>> Marek
>>
>>
>> 2. We have shared BOs which are used by more than one process.
>>
>> Those are rare and should be added to the per CS list of BOs
>> in use.
>>
>>
>> The whole BO list interface Marek tries to optimize here
>> should be
>> deprecated and not used any more.
>>
>> Regards,
>> Christian.
>>
>> Am 16.01.19 um 13:46 schrieb Bas Nieuwenhuizen:
>> > So random questions:
>> >
>> > 1) In this discussion it was mentioned that some Vulkan
>> drivers still
>> > use the bo_list interface. I think that implies radv as I
>> think we're
>> > still using bo_list. Is there any other API we should be
>> using? (Also,
>> > with VK_EXT_descriptor_indexing I suspect we'll be moving
>> more towards
>> > a global bo list instead of a cmd buffer one, as we cannot
>> know all
>> > the BOs referenced anymore, but not sure what end state
>> here will be).
>> >
>> > 2) The other alternative mentioned was adding the buffers
>> directly
>> > into the submit ioctl. Is this the desired end state
>> (though as above
>> > I'm not sure how that works for vulkan)? If yes, what is
>> the timeline
>> > for this that we need something in the interim?
>> >
>> > 3) Did we measure any performance benefit?
>> >
>> > In general I'd like to to ack the raw bo list creation
>> function as
>> > this interface seems easier to use. The two arrays thing
>> has always
>> > been kind of a pain when we want to use e.g. builtin sort
>> functions to
>> > make sure we have no duplicate BOs, but have some comments
>> below.
>> >
>> > On Mon, Jan 7, 2019 at 8:31 PM Marek Olšák
>> <maraeo at gmail.com <mailto:maraeo at gmail.com>> wrote:
>> >> From: Marek Olšák <marek.olsak at amd.com
>> <mailto:marek.olsak at amd.com>>
>> >>
>> >> ---
>> >> amdgpu/amdgpu-symbol-check | 3 ++
>> >> amdgpu/amdgpu.h | 56
>> +++++++++++++++++++++++++++++++++++++-
>> >> amdgpu/amdgpu_bo.c | 36 ++++++++++++++++++++++++
>> >> amdgpu/amdgpu_cs.c | 25 +++++++++++++++++
>> >> 4 files changed, 119 insertions(+), 1 deletion(-)
>> >>
>> >> diff --git a/amdgpu/amdgpu-symbol-check
>> b/amdgpu/amdgpu-symbol-check
>> >> index 6f5e0f95..96a44b40 100755
>> >> --- a/amdgpu/amdgpu-symbol-check
>> >> +++ b/amdgpu/amdgpu-symbol-check
>> >> @@ -12,20 +12,22 @@ _edata
>> >> _end
>> >> _fini
>> >> _init
>> >> amdgpu_bo_alloc
>> >> amdgpu_bo_cpu_map
>> >> amdgpu_bo_cpu_unmap
>> >> amdgpu_bo_export
>> >> amdgpu_bo_free
>> >> amdgpu_bo_import
>> >> amdgpu_bo_inc_ref
>> >> +amdgpu_bo_list_create_raw
>> >> +amdgpu_bo_list_destroy_raw
>> >> amdgpu_bo_list_create
>> >> amdgpu_bo_list_destroy
>> >> amdgpu_bo_list_update
>> >> amdgpu_bo_query_info
>> >> amdgpu_bo_set_metadata
>> >> amdgpu_bo_va_op
>> >> amdgpu_bo_va_op_raw
>> >> amdgpu_bo_wait_for_idle
>> >> amdgpu_create_bo_from_user_mem
>> >> amdgpu_cs_chunk_fence_info_to_data
>> >> @@ -40,20 +42,21 @@ amdgpu_cs_destroy_semaphore
>> >> amdgpu_cs_destroy_syncobj
>> >> amdgpu_cs_export_syncobj
>> >> amdgpu_cs_fence_to_handle
>> >> amdgpu_cs_import_syncobj
>> >> amdgpu_cs_query_fence_status
>> >> amdgpu_cs_query_reset_state
>> >> amdgpu_query_sw_info
>> >> amdgpu_cs_signal_semaphore
>> >> amdgpu_cs_submit
>> >> amdgpu_cs_submit_raw
>> >> +amdgpu_cs_submit_raw2
>> >> amdgpu_cs_syncobj_export_sync_file
>> >> amdgpu_cs_syncobj_import_sync_file
>> >> amdgpu_cs_syncobj_reset
>> >> amdgpu_cs_syncobj_signal
>> >> amdgpu_cs_syncobj_wait
>> >> amdgpu_cs_wait_fences
>> >> amdgpu_cs_wait_semaphore
>> >> amdgpu_device_deinitialize
>> >> amdgpu_device_initialize
>> >> amdgpu_find_bo_by_cpu_mapping
>> >> diff --git a/amdgpu/amdgpu.h b/amdgpu/amdgpu.h
>> >> index dc51659a..5b800033 100644
>> >> --- a/amdgpu/amdgpu.h
>> >> +++ b/amdgpu/amdgpu.h
>> >> @@ -35,20 +35,21 @@
>> >> #define _AMDGPU_H_
>> >>
>> >> #include <stdint.h>
>> >> #include <stdbool.h>
>> >>
>> >> #ifdef __cplusplus
>> >> extern "C" {
>> >> #endif
>> >>
>> >> struct drm_amdgpu_info_hw_ip;
>> >> +struct drm_amdgpu_bo_list_entry;
>> >>
>> >>
>> /*--------------------------------------------------------------------------*/
>> >> /* --------------------------- Defines
>> ------------------------------------ */
>> >>
>> /*--------------------------------------------------------------------------*/
>> >>
>> >> /**
>> >> * Define max. number of Command Buffers (IB) which
>> could be sent to the single
>> >> * hardware IP to accommodate CE/DE requirements
>> >> *
>> >> * \sa amdgpu_cs_ib_info
>> >> @@ -767,34 +768,65 @@ int
>> amdgpu_bo_cpu_unmap(amdgpu_bo_handle buf_handle);
>> >> * and no GPU access is
>> scheduled.
>> >> * 1 GPU access is in fly or
>> scheduled
>> >> *
>> >> * \return 0 - on success
>> >> * <0 - Negative POSIX Error code
>> >> */
>> >> int amdgpu_bo_wait_for_idle(amdgpu_bo_handle buf_handle,
>> >> uint64_t timeout_ns,
>> >> bool *buffer_busy);
>> >>
>> >> +/**
>> >> + * Creates a BO list handle for command submission.
>> >> + *
>> >> + * \param dev - \c [in] Device handle.
>> >> + * See #amdgpu_device_initialize()
>> >> + * \param number_of_buffers - \c [in] Number of BOs in
>> the list
>> >> + * \param buffers - \c [in] List of BO handles
>> >> + * \param result - \c [out] Created BO list
>> handle
>> >> + *
>> >> + * \return 0 on success\n
>> >> + * <0 - Negative POSIX Error code
>> >> + *
>> >> + * \sa amdgpu_bo_list_destroy_raw()
>> >> +*/
>> >> +int amdgpu_bo_list_create_raw(amdgpu_device_handle dev,
>> >> + uint32_t number_of_buffers,
>> >> + struct
>> drm_amdgpu_bo_list_entry *buffers,
>> >> + uint32_t *result);
>> > So AFAIU drm_amdgpu_bo_list_entry takes a raw bo handle
>> while we
>> > never get a raw bo handle from libdrm_amdgpu. How are we
>> supposed to
>> > fill it in?
>> >
>> > What do we win by having the raw handle for the bo_list? If
>> we would
>> > not return the raw handle we would not need the submit_raw2.
>> >
>> >> +
>> >> +/**
>> >> + * Destroys a BO list handle.
>> >> + *
>> >> + * \param bo_list - \c [in] BO list handle.
>> >> + *
>> >> + * \return 0 on success\n
>> >> + * <0 - Negative POSIX Error code
>> >> + *
>> >> + * \sa amdgpu_bo_list_create_raw(), amdgpu_cs_submit_raw2()
>> >> +*/
>> >> +int amdgpu_bo_list_destroy_raw(amdgpu_device_handle dev,
>> uint32_t bo_list);
>> >> +
>> >> /**
>> >> * Creates a BO list handle for command submission.
>> >> *
>> >> * \param dev - \c [in] Device handle.
>> >> * See #amdgpu_device_initialize()
>> >> * \param number_of_resources - \c [in] Number of
>> BOs in the list
>> >> * \param resources - \c [in] List of BO handles
>> >> * \param resource_prios - \c [in] Optional
>> priority for each handle
>> >> * \param result - \c [out] Created BO
>> list handle
>> >> *
>> >> * \return 0 on success\n
>> >> * <0 - Negative POSIX Error code
>> >> *
>> >> - * \sa amdgpu_bo_list_destroy()
>> >> + * \sa amdgpu_bo_list_destroy(), amdgpu_cs_submit_raw2()
>> >> */
>> >> int amdgpu_bo_list_create(amdgpu_device_handle dev,
>> >> uint32_t number_of_resources,
>> >> amdgpu_bo_handle *resources,
>> >> uint8_t *resource_prios,
>> >> amdgpu_bo_list_handle *result);
>> >>
>> >> /**
>> >> * Destroys a BO list handle.
>> >> *
>> >> @@ -1580,20 +1612,42 @@ struct drm_amdgpu_cs_chunk;
>> >> struct drm_amdgpu_cs_chunk_dep;
>> >> struct drm_amdgpu_cs_chunk_data;
>> >>
>> >> int amdgpu_cs_submit_raw(amdgpu_device_handle dev,
>> >> amdgpu_context_handle context,
>> >> amdgpu_bo_list_handle bo_list_handle,
>> >> int num_chunks,
>> >> struct drm_amdgpu_cs_chunk *chunks,
>> >> uint64_t *seq_no);
>> >>
>> >> +/**
>> >> + * Submit raw command submission to the kernel with a raw
>> BO list handle.
>> >> + *
>> >> + * \param dev - \c [in] device handle
>> >> + * \param context - \c [in] context handle for
>> context id
>> >> + * \param bo_list_handle - \c [in] raw bo list handle
>> (0 for none)
>> >> + * \param num_chunks - \c [in] number of CS chunks to
>> submit
>> >> + * \param chunks - \c [in] array of CS chunks
>> >> + * \param seq_no - \c [out] output sequence number
>> for submission.
>> >> + *
>> >> + * \return 0 on success\n
>> >> + * <0 - Negative POSIX Error code
>> >> + *
>> >> + * \sa amdgpu_bo_list_create_raw(),
>> amdgpu_bo_list_destroy_raw()
>> >> + */
>> >> +int amdgpu_cs_submit_raw2(amdgpu_device_handle dev,
>> >> + amdgpu_context_handle context,
>> >> + uint32_t bo_list_handle,
>> >> + int num_chunks,
>> >> + struct drm_amdgpu_cs_chunk *chunks,
>> >> + uint64_t *seq_no);
>> >> +
>> >> void amdgpu_cs_chunk_fence_to_dep(struct amdgpu_cs_fence
>> *fence,
>> >> struct drm_amdgpu_cs_chunk_dep *dep);
>> >> void amdgpu_cs_chunk_fence_info_to_data(struct
>> amdgpu_cs_fence_info *fence_info,
>> >> struct drm_amdgpu_cs_chunk_data *data);
>> >>
>> >> /**
>> >> * Reserve VMID
>> >> * \param context - \c [in] GPU Context
>> >> * \param flags - \c [in] TBD
>> >> *
>> >> diff --git a/amdgpu/amdgpu_bo.c b/amdgpu/amdgpu_bo.c
>> >> index c0f42e81..21bc73aa 100644
>> >> --- a/amdgpu/amdgpu_bo.c
>> >> +++ b/amdgpu/amdgpu_bo.c
>> >> @@ -611,20 +611,56 @@ drm_public int
>> amdgpu_create_bo_from_user_mem(amdgpu_device_handle dev,
>> >> pthread_mutex_lock(&dev->bo_table_mutex);
>> >> r = handle_table_insert(&dev->bo_handles,
>> (*buf_handle)->handle,
>> >> *buf_handle);
>> >> pthread_mutex_unlock(&dev->bo_table_mutex);
>> >> if (r)
>> >> amdgpu_bo_free(*buf_handle);
>> >> out:
>> >> return r;
>> >> }
>> >>
>> >> +drm_public int
>> amdgpu_bo_list_create_raw(amdgpu_device_handle dev,
>> >> + uint32_t number_of_buffers,
>> >> + struct drm_amdgpu_bo_list_entry *buffers,
>> >> + uint32_t *result)
>> >> +{
>> >> + union drm_amdgpu_bo_list args;
>> >> + int r;
>> >> +
>> >> + memset(&args, 0, sizeof(args));
>> >> + args.in.operation = AMDGPU_BO_LIST_OP_CREATE;
>> >> + args.in.bo_number = number_of_buffers;
>> >> + args.in.bo_info_size = sizeof(struct
>> drm_amdgpu_bo_list_entry);
>> >> + args.in.bo_info_ptr = (uint64_t)(uintptr_t)buffers;
>> >> +
>> >> + r = drmCommandWriteRead(dev->fd, DRM_AMDGPU_BO_LIST,
>> >> + &args, sizeof(args));
>> >> + if (r)
>> >> + return r;
>> >> +
>> >> + *result = args.out.list_handle;
>> >> + return 0;
>> >> +}
>> >> +
>> >> +drm_public int
>> amdgpu_bo_list_destroy_raw(amdgpu_device_handle dev,
>> >> + uint32_t bo_list)
>> >> +{
>> >> + union drm_amdgpu_bo_list args;
>> >> +
>> >> + memset(&args, 0, sizeof(args));
>> >> + args.in.operation = AMDGPU_BO_LIST_OP_DESTROY;
>> >> + args.in.list_handle = bo_list;
>> >> +
>> >> + return drmCommandWriteRead(dev->fd,
>> DRM_AMDGPU_BO_LIST,
>> >> + &args, sizeof(args));
>> >> +}
>> >> +
>> >> drm_public int
>> amdgpu_bo_list_create(amdgpu_device_handle dev,
>> >> uint32_t number_of_resources,
>> >> amdgpu_bo_handle *resources,
>> >> uint8_t *resource_prios,
>> >> amdgpu_bo_list_handle *result)
>> >> {
>> >> struct drm_amdgpu_bo_list_entry *list;
>> >> union drm_amdgpu_bo_list args;
>> >> unsigned i;
>> >> int r;
>> >> diff --git a/amdgpu/amdgpu_cs.c b/amdgpu/amdgpu_cs.c
>> >> index 3b8231aa..5bedf748 100644
>> >> --- a/amdgpu/amdgpu_cs.c
>> >> +++ b/amdgpu/amdgpu_cs.c
>> >> @@ -724,20 +724,45 @@ drm_public int
>> amdgpu_cs_submit_raw(amdgpu_device_handle dev,
>> >> r = drmCommandWriteRead(dev->fd, DRM_AMDGPU_CS,
>> >> &cs, sizeof(cs));
>> >> if (r)
>> >> return r;
>> >>
>> >> if (seq_no)
>> >> *seq_no = cs.out.handle;
>> >> return 0;
>> >> }
>> >>
>> >> +drm_public int amdgpu_cs_submit_raw2(amdgpu_device_handle
>> dev,
>> >> + amdgpu_context_handle context,
>> >> + uint32_t bo_list_handle,
>> >> + int num_chunks,
>> >> + struct drm_amdgpu_cs_chunk *chunks,
>> >> + uint64_t *seq_no)
>> >> +{
>> >> + union drm_amdgpu_cs cs = {0};
>> >> + uint64_t *chunk_array;
>> >> + int i, r;
>> >> +
>> >> + chunk_array = alloca(sizeof(uint64_t) * num_chunks);
>> >> + for (i = 0; i < num_chunks; i++)
>> >> + chunk_array[i] =
>> (uint64_t)(uintptr_t)&chunks[i];
>> >> + cs.in.chunks = (uint64_t)(uintptr_t)chunk_array;
>> >> + cs.in.ctx_id = context->id;
>> >> + cs.in.bo_list_handle = bo_list_handle;
>> >> + cs.in.num_chunks = num_chunks;
>> >> + r = drmCommandWriteRead(dev->fd, DRM_AMDGPU_CS,
>> >> + &cs, sizeof(cs));
>> >> + if (!r && seq_no)
>> >> + *seq_no = cs.out.handle;
>> >> + return r;
>> >> +}
>> >> +
>> >> drm_public void
>> amdgpu_cs_chunk_fence_info_to_data(struct
>> amdgpu_cs_fence_info *fence_info,
>> >> struct drm_amdgpu_cs_chunk_data *data)
>> >> {
>> >> data->fence_data.handle = fence_info->handle->handle;
>> >> data->fence_data.offset = fence_info->offset *
>> sizeof(uint64_t);
>> >> }
>> >>
>> >> drm_public void amdgpu_cs_chunk_fence_to_dep(struct
>> amdgpu_cs_fence *fence,
>> >> struct drm_amdgpu_cs_chunk_dep *dep)
>> >> {
>> >> --
>> >> 2.17.1
>> >>
>> >> _______________________________________________
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>> >> amd-gfx at lists.freedesktop.org
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>>
>
>
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