[PATCH] drm/amdgpu: set vm size and block size by individual gmc by default
Christian König
deathsimple at vodafone.de
Wed Apr 5 13:39:26 UTC 2017
Am 05.04.2017 um 15:32 schrieb Alex Deucher:
> On Wed, Apr 5, 2017 at 5:01 AM, Christian König <deathsimple at vodafone.de> wrote:
>> Am 05.04.2017 um 08:43 schrieb Junwei Zhang:
>>> By default, the value is set by individual gmc.
>>> if a specific value is input, it overrides the global value for all
>>>
>>> Signed-off-by: Junwei Zhang <Jerry.Zhang at amd.com>
>>> ---
>>> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 ++
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 44
>>> ++++++++++++++++++------------
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 +-
>>> drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c | 10 +++++--
>>> drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 10 +++++--
>>> drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 10 +++++--
>>> drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 30 ++++++++++++++------
>>> 7 files changed, 74 insertions(+), 34 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> index 65021df..d7f75ce 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> @@ -1647,6 +1647,8 @@ void amdgpu_mm_wreg(struct amdgpu_device *adev,
>>> uint32_t reg, uint32_t v,
>>> bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type);
>>> bool amdgpu_device_has_dc_support(struct amdgpu_device *adev);
>>> +uint32_t amdgpu_get_block_size(int vm_size);
>>> +
>>> /*
>>> * Registers read & write functions.
>>> */
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> index 1d0c742..2f91c2f 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> @@ -1039,35 +1039,44 @@ static bool amdgpu_check_pot_argument(int arg)
>>> return (arg & (arg - 1)) == 0;
>>> }
>>> -static void amdgpu_get_block_size(struct amdgpu_device *adev)
>>> +uint32_t amdgpu_get_block_size(int vm_size)
>>> +{
>>> + /* Total bits covered by PD + PTs */
>>> + unsigned bits = ilog2(vm_size) + 18;
>>> +
>>> + /* Make sure the PD is 4K in size up to 8GB address space.
>>> + Above that split equal between PD and PTs */
>>> + if (vm_size <= 8)
>>> + return (bits - 9);
>>> + else
>>> + return ((bits + 3) / 2);
>>> +}
>>
>> Please move that helper into amdgpu_vmc.c.
>>
>>
>>> +
>>> +static void amdgpu_check_block_size(struct amdgpu_device *adev)
>>> {
>>> /* defines number of bits in page table versus page directory,
>>> * a page is 4KB so we have 12 bits offset, minimum 9 bits in the
>>> * page table and the remaining bits are in the page directory */
>>> - if (amdgpu_vm_block_size == -1) {
>>> -
>>> - /* Total bits covered by PD + PTs */
>>> - unsigned bits = ilog2(amdgpu_vm_size) + 18;
>>> -
>>> - /* Make sure the PD is 4K in size up to 8GB address space.
>>> - Above that split equal between PD and PTs */
>>> - if (amdgpu_vm_size <= 8)
>>> - amdgpu_vm_block_size = bits - 9;
>>> - else
>>> - amdgpu_vm_block_size = (bits + 3) / 2;
>>> + if (amdgpu_vm_block_size == -1)
>>> + return;
>>> - } else if (amdgpu_vm_block_size < 9) {
>>> + if (amdgpu_vm_block_size < 9) {
>>> dev_warn(adev->dev, "VM page table size (%d) too small\n",
>>> amdgpu_vm_block_size);
>>> - amdgpu_vm_block_size = 9;
>>> + goto def_value;
>>> }
>>> if (amdgpu_vm_block_size > 24 ||
>>> (amdgpu_vm_size * 1024) < (1ull << amdgpu_vm_block_size)) {
>>> dev_warn(adev->dev, "VM page table size (%d) too large\n",
>>> amdgpu_vm_block_size);
>>> - amdgpu_vm_block_size = 9;
>>> + goto def_value;
>>> }
>>> +
>>> + return;
>>> +
>>> +def_value:
>>> + amdgpu_vm_block_size = -1;
>>> }
>>> static void amdgpu_check_vm_size(struct amdgpu_device *adev)
>>> @@ -1096,8 +1105,7 @@ static void amdgpu_check_vm_size(struct
>>> amdgpu_device *adev)
>>> return;
>>> def_value:
>>> - amdgpu_vm_size = 8;
>>> - dev_info(adev->dev, "set default VM size %dGB\n", amdgpu_vm_size);
>>> + amdgpu_vm_size = -1;;
>>> }
>>> /**
>>> @@ -1131,7 +1139,7 @@ static void amdgpu_check_arguments(struct
>>> amdgpu_device *adev)
>>> amdgpu_check_vm_size(adev);
>>> - amdgpu_get_block_size(adev);
>>> + amdgpu_check_block_size(adev);
>>> if (amdgpu_vram_page_split != -1 && (amdgpu_vram_page_split < 16
>>> ||
>>> !amdgpu_check_pot_argument(amdgpu_vram_page_split))) {
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> index bfd945b..6238e2e 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> @@ -86,7 +86,7 @@
>>> unsigned amdgpu_ip_block_mask = 0xffffffff;
>>> int amdgpu_bapm = -1;
>>> int amdgpu_deep_color = 0;
>>> -int amdgpu_vm_size = 64;
>>> +int amdgpu_vm_size = -1;
>>> int amdgpu_vm_block_size = -1;
>>> int amdgpu_vm_fault_stop = 0;
>>> int amdgpu_vm_debug = 0;
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
>>> b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
>>> index 30d5c42..f46c52c 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
>>> @@ -849,8 +849,14 @@ static int gmc_v6_0_sw_init(void *handle)
>>> if (r)
>>> return r;
>>> - adev->vm_manager.vm_size = amdgpu_vm_size;
>>> - adev->vm_manager.block_size = amdgpu_vm_block_size;
>>> + if (amdgpu_vm_size == -1) {
>>> + adev->vm_manager.vm_size = 64;
>>> + adev->vm_manager.block_size =
>>> + amdgpu_get_block_size(adev->vm_manager.vm_size);
>>> + } else {
>>> + adev->vm_manager.vm_size = amdgpu_vm_size;
>>> + adev->vm_manager.block_size = amdgpu_vm_block_size;
>>> + }
>>> adev->vm_manager.max_pfn = adev->vm_manager.vm_size << 18;
>>> DRM_INFO("vm size is %d GB, block size is %d-bit\n",
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
>>> b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
>>> index 7113765..80b31f4 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
>>> @@ -1003,8 +1003,14 @@ static int gmc_v7_0_sw_init(void *handle)
>>> * Currently set to 4GB ((1 << 20) 4k pages).
>>> * Max GPUVM size for cayman and SI is 40 bits.
>>> */
>>> - adev->vm_manager.vm_size = amdgpu_vm_size;
>>> - adev->vm_manager.block_size = amdgpu_vm_block_size;
>>> + if (amdgpu_vm_size == -1) {
>>> + adev->vm_manager.vm_size = 64;
>>> + adev->vm_manager.block_size =
>>> + amdgpu_get_block_size(adev->vm_manager.vm_size);
>>> + } else {
>>> + adev->vm_manager.vm_size = amdgpu_vm_size;
>>> + adev->vm_manager.block_size = amdgpu_vm_block_size;
>>> + }
>>
>> That's a bit to simple. The logic should probably rather be:
>>
>> if (amdgpu_vm_size == -1)
>> adev->vm_manager.vm_size = 64;
>> else
>> adev->vm_manager.vm_size = amdgpu_vm_size;
>>
>> if (amdgpu_vm_block_size == -1)
>> adev->vm_manager.block_size =
>> amdgpu_get_block_size(adev->vm_manager.vm_size);
>> else
>> adev->vm_manager.block_size = amdgpu_vm_block_size;
>>
>>
>> Since the logic is the same for GFX6,7 and 8 we might put that into a helper
>> as well.
>>
>>
>>> adev->vm_manager.max_pfn = adev->vm_manager.vm_size << 18;
>>> DRM_INFO("vm size is %d GB, block size is %d-bit\n",
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
>>> b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
>>> index b3d1f1b..f1f135a 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
>>> @@ -1087,8 +1087,14 @@ static int gmc_v8_0_sw_init(void *handle)
>>> * Currently set to 4GB ((1 << 20) 4k pages).
>>> * Max GPUVM size for cayman and SI is 40 bits.
>>> */
>>> - adev->vm_manager.vm_size = amdgpu_vm_size;
>>> - adev->vm_manager.block_size = amdgpu_vm_block_size;
>>> + if (amdgpu_vm_size == -1) {
>>> + adev->vm_manager.vm_size = 64;
>>> + adev->vm_manager.block_size =
>>> + amdgpu_get_block_size(adev->vm_manager.vm_size);
>>> + } else {
>>> + adev->vm_manager.vm_size = amdgpu_vm_size;
>>> + adev->vm_manager.block_size = amdgpu_vm_block_size;
>>> + }
>>> adev->vm_manager.max_pfn = adev->vm_manager.vm_size << 18;
>>> DRM_INFO("vm size is %d GB, block size is %d-bit\n",
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
>>> b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
>>> index 0cae7f0..8e12ff3 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
>>> @@ -532,18 +532,9 @@ static int gmc_v9_0_sw_init(void *handle)
>>> if (adev->flags & AMD_IS_APU) {
>>> adev->mc.vram_type = AMDGPU_VRAM_TYPE_UNKNOWN;
>>> - adev->vm_manager.vm_size = amdgpu_vm_size;
>>> - adev->vm_manager.block_size = amdgpu_vm_block_size;
>>> } else {
>>> /* XXX Don't know how to get VRAM type yet. */
>>> adev->mc.vram_type = AMDGPU_VRAM_TYPE_HBM;
>>> - /*
>>> - * To fulfill 4-level page support,
>>> - * vm size is 256TB (48bit), maximum size of Vega10,
>>> - * block size 512 (9bit)
>>> - */
>>> - adev->vm_manager.vm_size = 1U << 18;
>>> - adev->vm_manager.block_size = 9;
>>> }
>>> DRM_INFO("vm size is %d GB, block size is %d-bit\n",
>>> @@ -558,6 +549,27 @@ static int gmc_v9_0_sw_init(void *handle)
>>> if (r)
>>> return r;
>>> + if (amdgpu_vm_size == -1) {
>>> + if (adev->flags & AMD_IS_APU) {
>>> + adev->vm_manager.vm_size = 64;
>>> + adev->vm_manager.block_size =
>>> +
>>> amdgpu_get_block_size(adev->vm_manager.vm_size);
>>> + } else {
>>> + /*
>>> + * To fulfill 4-level page support,
>>> + * vm size is 256TB (48bit), maximum size of
>>> Vega10,
>>> + * block size 512 (9bit)
>>> + */
>>> + adev->vm_manager.vm_size = 1U << 18;
>>> + adev->vm_manager.block_size = 9;
>>> + }
>>> + } else {
>>> + adev->vm_manager.vm_size = amdgpu_vm_size;
>>> + adev->vm_manager.block_size = amdgpu_vm_block_size;
>>> + }
>>> +
>>> + adev->vm_manager.vm_size = amdgpu_vm_size;
>>> + adev->vm_manager.block_size = amdgpu_vm_block_size;
>>
>> NAK. On GFX9 vm_size and block_size should be hard coded to 256TB and 9.
> I think there is still value in being able to override for testing/debugging.
The problem is that this won't work. When you want to override the size
you need to work with 1 level page tables again.
We could of course try to determine how many levels we want from the VM
size/block size, but I don't really want to test all those options all
the time.
Christian.
>
> Alex
>
>> Christian.
>>
>>> adev->vm_manager.max_pfn = adev->vm_manager.vm_size << 18;
>>> /* Set the internal MC address mask
>>
>>
>> _______________________________________________
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