[PATCH] drm/amdgpu: Add sysfs files for returning VRAM/GTT info
Kuehling, Felix
Felix.Kuehling at amd.com
Thu Feb 28 16:09:16 UTC 2019
On 2/28/2019 9:56 AM, Christian König wrote:
> Am 28.02.19 um 16:32 schrieb Russell, Kent:
>> Add 3 files that return:
>> The total amount of VRAM and the current total used VRAM
>> The total amount of VRAM and the current total used visible VRAM
>> The total GTT size and the current total of used GTT
>>
>> Each returns 2 integers, total and used, in bytes
>
> Well that is a good start, but unfortunately violates the rules for
> sysfs. You need to return one value per file.
Is this rule written down anywhere. I see that space-separated lists of
things are common. E.g. scaling_available_governors in the cpufreq
directories.
In Documentation/admin-guide/sysfs-rules.rst I don't see any rule about
single value per file. Maybe that's because these rules are more from
user mode usage of sysfs rather than for kernel implementations.
Regards,
Felix
>
> So you should create 6 files in total.
>
> Regards,
> Christian.
>
>>
>> Change-Id: I0bd702b166b4253887ef76fb1bba8b9aadc7e2c5
>> Signed-off-by: Kent Russell <kent.russell at amd.com>
>> ---
>> drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 36 +++++++++++
>> drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 67 ++++++++++++++++++++
>> 2 files changed, 103 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
>> index da7b1b92d9cf..adfa211c5152 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
>> @@ -36,6 +36,30 @@ struct amdgpu_gtt_node {
>> struct ttm_buffer_object *tbo;
>> };
>> +/**
>> + * DOC: mem_info_gtt
>> + *
>> + * The amdgpu driver provides a sysfs API for reporting current GTT
>> information
>> + * The file mem_info_gtt is used for this.
>> + * The file returns the total size of the GTT block and the current
>> amount of
>> + * used GTT as 2 separate integers, in bytes
>> + */
>> +static ssize_t amdgpu_mem_info_gtt_show(struct device *dev,
>> + struct device_attribute *attr, char *buf)
>> +{
>> + struct drm_device *ddev = dev_get_drvdata(dev);
>> + struct amdgpu_device *adev = ddev->dev_private;
>> + uint64_t used_gtt, total_gtt;
>> +
>> + used_gtt = amdgpu_gtt_mgr_usage(&adev->mman.bdev.man[TTM_PL_TT]);
>> + total_gtt = (adev->mman.bdev.man[TTM_PL_TT].size) * PAGE_SIZE;
>> +
>> + return snprintf(buf, PAGE_SIZE, "%llu %llu\n",
>> + total_gtt, used_gtt);
>> +}
>> +
>> +static DEVICE_ATTR(mem_info_gtt, S_IRUGO, amdgpu_mem_info_gtt_show,
>> NULL);
>> +
>> /**
>> * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
>> *
>> @@ -50,6 +74,7 @@ static int amdgpu_gtt_mgr_init(struct
>> ttm_mem_type_manager *man,
>> struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
>> struct amdgpu_gtt_mgr *mgr;
>> uint64_t start, size;
>> + int ret;
>> mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
>> if (!mgr)
>> @@ -61,6 +86,13 @@ static int amdgpu_gtt_mgr_init(struct
>> ttm_mem_type_manager *man,
>> spin_lock_init(&mgr->lock);
>> atomic64_set(&mgr->available, p_size);
>> man->priv = mgr;
>> +
>> + ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt);
>> + if (ret) {
>> + DRM_ERROR("Failed to create device file mem_info_gtt\n");
>> + return ret;
>> + }
>> +
>> return 0;
>> }
>> @@ -74,12 +106,16 @@ static int amdgpu_gtt_mgr_init(struct
>> ttm_mem_type_manager *man,
>> */
>> static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
>> {
>> + struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
>> struct amdgpu_gtt_mgr *mgr = man->priv;
>> spin_lock(&mgr->lock);
>> drm_mm_takedown(&mgr->mm);
>> spin_unlock(&mgr->lock);
>> kfree(mgr);
>> man->priv = NULL;
>> +
>> + device_remove_file(adev->dev, &dev_attr_mem_info_gtt);
>> +
>> return 0;
>> }
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>> index 3f9d5d00c9b3..d0bada997cba 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>> @@ -32,6 +32,55 @@ struct amdgpu_vram_mgr {
>> atomic64_t vis_usage;
>> };
>> +/**
>> + * DOC: mem_info_vram
>> + *
>> + * The amdgpu driver provides a sysfs API for reporting current VRAM
>> information
>> + * The file mem_info_vram is used for this.
>> + * The file returns the total amount of VRAM and the current total
>> amount of
>> + * used VRAM as 2 separate integers, in bytes
>> + */
>> +static ssize_t amdgpu_mem_info_vram_show(struct device *dev,
>> + struct device_attribute *attr, char *buf)
>> +{
>> + struct drm_device *ddev = dev_get_drvdata(dev);
>> + struct amdgpu_device *adev = ddev->dev_private;
>> + uint64_t used_vram, total_vram;
>> +
>> + used_vram =
>> amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM]);
>> + total_vram = adev->gmc.real_vram_size;
>> +
>> + return snprintf(buf, PAGE_SIZE, "%llu %llu\n", total_vram,
>> used_vram);
>> +}
>> +
>> +/**
>> + * DOC: mem_info_vis_vram
>> + *
>> + * The amdgpu driver provides a sysfs API for reporting current
>> visible VRAM
>> + * information
>> + * The file mem_info_vis_vram is used for this.
>> + * The file returns the total amount of VRAM and the current total
>> amount of
>> + * used visible VRAM as 2 separate integers, in bytes
>> + */
>> +static ssize_t amdgpu_mem_info_vis_vram_show(struct device *dev,
>> + struct device_attribute *attr, char *buf)
>> +{
>> + struct drm_device *ddev = dev_get_drvdata(dev);
>> + struct amdgpu_device *adev = ddev->dev_private;
>> + uint64_t used_vis_vram, total_vram;
>> +
>> + used_vis_vram =
>> + amdgpu_vram_mgr_vis_usage(&adev->mman.bdev.man[TTM_PL_VRAM]);
>> + total_vram = adev->gmc.real_vram_size;
>> +
>> + return snprintf(buf, PAGE_SIZE, "%llu %llu\n",
>> + total_vram, used_vis_vram);
>> +}
>> +
>> +static DEVICE_ATTR(mem_info_vram, S_IRUGO,
>> amdgpu_mem_info_vram_show, NULL);
>> +static DEVICE_ATTR(mem_info_vis_vram, S_IRUGO,
>> amdgpu_mem_info_vis_vram_show,
>> + NULL);
>> +
>> /**
>> * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
>> *
>> @@ -43,7 +92,9 @@ struct amdgpu_vram_mgr {
>> static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
>> unsigned long p_size)
>> {
>> + struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
>> struct amdgpu_vram_mgr *mgr;
>> + int ret;
>> mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
>> if (!mgr)
>> @@ -52,6 +103,19 @@ static int amdgpu_vram_mgr_init(struct
>> ttm_mem_type_manager *man,
>> drm_mm_init(&mgr->mm, 0, p_size);
>> spin_lock_init(&mgr->lock);
>> man->priv = mgr;
>> +
>> + /* Add the two VRAM-related sysfs files */
>> + ret = device_create_file(adev->dev, &dev_attr_mem_info_vram);
>> + if (ret) {
>> + DRM_ERROR("Failed to create device file mem_info_vram\n");
>> + return ret;
>> + }
>> + ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram);
>> + if (ret) {
>> + DRM_ERROR("Failed to create device file mem_info_vis_vram\n");
>> + return ret;
>> + }
>> +
>> return 0;
>> }
>> @@ -65,6 +129,7 @@ static int amdgpu_vram_mgr_init(struct
>> ttm_mem_type_manager *man,
>> */
>> static int amdgpu_vram_mgr_fini(struct ttm_mem_type_manager *man)
>> {
>> + struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
>> struct amdgpu_vram_mgr *mgr = man->priv;
>> spin_lock(&mgr->lock);
>> @@ -72,6 +137,8 @@ static int amdgpu_vram_mgr_fini(struct
>> ttm_mem_type_manager *man)
>> spin_unlock(&mgr->lock);
>> kfree(mgr);
>> man->priv = NULL;
>> + device_remove_file(adev->dev, &dev_attr_mem_info_vram);
>> + device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram);
>> return 0;
>> }
>
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