[PATCH 28/37] drm/amdkfd: Add support for displaying VRAM usage
Russell, Kent
Kent.Russell at amd.com
Tue Dec 12 11:11:09 UTC 2017
That's alright. I admit that it was a bit self-serving in that I was asked to get something somewhere to get the information out, and it was the simplest solution. I can see if I can come up with a more acceptable option in a future patch set, but for now I think Felix is right in that we can just drop this one for now, it's definitely not worth holding up the rest of the patches over.
Kent
-----Original Message-----
From: Kuehling, Felix
Sent: Monday, December 11, 2017 2:52 PM
To: Koenig, Christian; Oded Gabbay
Cc: Russell, Kent; amd-gfx list
Subject: Re: [PATCH 28/37] drm/amdkfd: Add support for displaying VRAM usage
On 2017-12-11 12:28 PM, Christian König wrote:
> Am 11.12.2017 um 17:40 schrieb Oded Gabbay:
>> On Mon, Dec 11, 2017 at 5:32 PM, Oded Gabbay <oded.gabbay at gmail.com>
>> wrote:
>>> On Sat, Dec 9, 2017 at 6:09 AM, Felix Kuehling
>>> <Felix.Kuehling at amd.com> wrote:
>>>> From: Kent Russell <kent.russell at amd.com>
>>>>
>>>> Add a sysfs file in topology (node/x/memory_banks/X/used_memory)
>>>> that reports the current VRAM usage for that node. Only works for
>>>> GPU nodes at this time.
>>>>
>>> As with patch 22 (perf counters), I would not expect this
>>> information to be included in the topology. It doesn't describe the
>>> properties of the device, but a current state.
>>> Oded
>> For example, in amdgpu, the VRAM usage is reported in the INFO IOCTL
>> (AMDGPU_INFO_VRAM_USAGE). See function amdgpu_info_ioctl()
>
> Yep, completely agree.
>
> That stuff is runtime properties and not static attribute nor
> configuration or setup.
>
> So either debugfs or IOCTL are the two best options as far as I can see.
Right. I admit, this feature was a bit of a hack to quickly enable the HIP team without having to change a bunch of interfaces (ioctls, Thunk, and Runtime).
This patch isn't critical for enabling dGPU support. I'll drop it for now and we can reimplement it properly later.
Regards,
Felix
>
> Christian.
>
>>
>> Thanks,
>>
>> Oded
>>
>>
>>>> Signed-off-by: Kent Russell <kent.russell at amd.com>
>>>> Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
>>>> ---
>>>> drivers/gpu/drm/amd/amdkfd/kfd_topology.c | 49
>>>> +++++++++++++++++++++++++++----
>>>> drivers/gpu/drm/amd/amdkfd/kfd_topology.h | 4 ++-
>>>> 2 files changed, 46 insertions(+), 7 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
>>>> b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
>>>> index 7f0d41e..7f04038 100644
>>>> --- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
>>>> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
>>>> @@ -186,6 +186,8 @@ struct kfd_topology_device
>>>> *kfd_create_topology_device(
>>>> sysfs_show_gen_prop(buffer, "%s %llu\n", name,
>>>> value)
>>>> #define sysfs_show_32bit_val(buffer, value) \
>>>> sysfs_show_gen_prop(buffer, "%u\n", value)
>>>> +#define sysfs_show_64bit_val(buffer, value) \
>>>> + sysfs_show_gen_prop(buffer, "%llu\n", value)
>>>> #define sysfs_show_str_val(buffer, value) \
>>>> sysfs_show_gen_prop(buffer, "%s\n", value)
>>>>
>>>> @@ -268,11 +270,23 @@ static ssize_t mem_show(struct kobject *kobj,
>>>> struct attribute *attr,
>>>> {
>>>> ssize_t ret;
>>>> struct kfd_mem_properties *mem;
>>>> + uint64_t used_mem;
>>>>
>>>> /* Making sure that the buffer is an empty string */
>>>> buffer[0] = 0;
>>>>
>>>> - mem = container_of(attr, struct kfd_mem_properties, attr);
>>>> + if (strcmp(attr->name, "used_memory") == 0) {
>>>> + mem = container_of(attr, struct kfd_mem_properties,
>>>> attr_used);
>>>> + if (mem->gpu) {
>>>> + used_mem =
>>>> +mem->gpu->kfd2kgd->get_vram_usage(
>>>> +
>>>> mem->gpu->kgd);
>>>> + return sysfs_show_64bit_val(buffer,
>>>> +used_mem);
>>>> + }
>>>> + /* TODO: Report APU/CPU-allocated memory; For now
>>>> return 0 */
>>>> + return 0;
>>>> + }
>>>> +
>>>> + mem = container_of(attr, struct kfd_mem_properties,
>>>> attr_props);
>>>> sysfs_show_32bit_prop(buffer, "heap_type",
>>>> mem->heap_type);
>>>> sysfs_show_64bit_prop(buffer, "size_in_bytes",
>>>> mem->size_in_bytes);
>>>> sysfs_show_32bit_prop(buffer, "flags", mem->flags); @@
>>>> -527,7 +541,12 @@ static void kfd_remove_sysfs_node_entry(struct
>>>> kfd_topology_device *dev)
>>>> if (dev->kobj_mem) {
>>>> list_for_each_entry(mem, &dev->mem_props, list)
>>>> if (mem->kobj) {
>>>> - kfd_remove_sysfs_file(mem->kobj,
>>>> &mem->attr);
>>>> + /* TODO: Remove when CPU/APU
>>>> supported */
>>>> + if (dev->node_props.cpu_cores_count
>>>> == 0)
>>>> +
>>>> +sysfs_remove_file(mem->kobj,
>>>> +
>>>> &mem->attr_used);
>>>> + kfd_remove_sysfs_file(mem->kobj,
>>>> + &mem->attr_props);
>>>> mem->kobj = NULL;
>>>> }
>>>> kobject_del(dev->kobj_mem); @@ -629,12 +648,23 @@
>>>> static int kfd_build_sysfs_node_entry(struct kfd_topology_device
>>>> *dev,
>>>> if (ret < 0)
>>>> return ret;
>>>>
>>>> - mem->attr.name = "properties";
>>>> - mem->attr.mode = KFD_SYSFS_FILE_MODE;
>>>> - sysfs_attr_init(&mem->attr);
>>>> - ret = sysfs_create_file(mem->kobj, &mem->attr);
>>>> + mem->attr_props.name = "properties";
>>>> + mem->attr_props.mode = KFD_SYSFS_FILE_MODE;
>>>> + sysfs_attr_init(&mem->attr_props);
>>>> + ret = sysfs_create_file(mem->kobj,
>>>> +&mem->attr_props);
>>>> if (ret < 0)
>>>> return ret;
>>>> +
>>>> + /* TODO: Support APU/CPU memory usage */
>>>> + if (dev->node_props.cpu_cores_count == 0) {
>>>> + mem->attr_used.name = "used_memory";
>>>> + mem->attr_used.mode = KFD_SYSFS_FILE_MODE;
>>>> + sysfs_attr_init(&mem->attr_used);
>>>> + ret = sysfs_create_file(mem->kobj,
>>>> &mem->attr_used);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + }
>>>> +
>>>> i++;
>>>> }
>>>>
>>>> @@ -1075,15 +1105,22 @@ static struct kfd_topology_device
>>>> *kfd_assign_gpu(struct kfd_dev *gpu)
>>>> {
>>>> struct kfd_topology_device *dev;
>>>> struct kfd_topology_device *out_dev = NULL;
>>>> + struct kfd_mem_properties *mem;
>>>>
>>>> down_write(&topology_lock);
>>>> list_for_each_entry(dev, &topology_device_list, list)
>>>> if (!dev->gpu && (dev->node_props.simd_count > 0))
>>>> {
>>>> dev->gpu = gpu;
>>>> out_dev = dev;
>>>> +
>>>> + /* Assign mem->gpu */
>>>> + list_for_each_entry(mem, &dev->mem_props,
>>>> list)
>>>> + mem->gpu = dev->gpu;
>>>> +
>>>> break;
>>>> }
>>>> up_write(&topology_lock);
>>>> +
>>>> return out_dev;
>>>> }
>>>>
>>>> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.h
>>>> b/drivers/gpu/drm/amd/amdkfd/kfd_topology.h
>>>> index 53fca1f..0f698d8 100644
>>>> --- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.h
>>>> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.h
>>>> @@ -93,7 +93,9 @@ struct kfd_mem_properties {
>>>> uint32_t width;
>>>> uint32_t mem_clk_max;
>>>> struct kobject *kobj;
>>>> - struct attribute attr;
>>>> + struct kfd_dev *gpu;
>>>> + struct attribute attr_props;
>>>> + struct attribute attr_used;
>>>> };
>>>>
>>>> #define HSA_CACHE_TYPE_DATA 0x00000001
>>>> --
>>>> 2.7.4
>>>>
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