Am 2021-07-16 um 12:43 p.m. schrieb Jonathan Kim:
> Similar to xGMI reporting the min/max bandwidth between direct peers, PCIe
> will report the min/max bandwidth to the KFD.
>
> v2: change to bandwidth
>
> Signed-off-by: Jonathan Kim
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c | 61 ++
Am 2021-07-16 um 12:43 p.m. schrieb Jonathan Kim:
> Report the min/max bandwidth in megabytes to the kfd for direct
> xgmi connections only.
By "direct XGMI connections", you mean this doesn't work for links with
more than one hop? Will that spew out DRM_ERROR messages for such links?
Then it's pr
Device generic type case added for migrate_vma_pages and
migrate_vma_check_page helpers.
Both, generic and private device types have the same
conditions to decide to migrate pages from/to device
memory.
Signed-off-by: Alex Sierra
---
mm/migrate.c | 20 +---
1 file changed, 9 inse
Generic device type memory on VRAM to RAM migration,
has similar access as System RAM from the CPU. This flag sets
the source from the sender. Which in Generic type case,
should be set as SYSTEM.
Signed-off-by: Alex Sierra
Reviewed-by: Felix Kuehling
---
drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
The AMD architecture for the Frontier supercomputer will
have device memory which can be coherently accessed by
the CPU. The system BIOS advertises this memory as SPM
(special purpose memory) in the UEFI system address map.
The AMDGPU driver needs to be able to lookup this resource
in order to cla
v1:
AMD is building a system architecture for the Frontier supercomputer with a
coherent interconnect between CPUs and GPUs. This hardware architecture allows
the CPUs to coherently access GPU device memory. We have hardware in our labs
and we are working with our partner HPE on the BIOS, firmware
Add MEMORY_DEVICE_GENERIC case to free_zone_device_page
callback.
Device generic type memory case is now able to free its
pages properly.
Signed-off-by: Alex Sierra
---
mm/memremap.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/memremap.c b/mm/memremap.c
index 614b
When CPU is connected throug XGMI, it has coherent
access to VRAM resource. In this case that resource
is taken from a table in the device gmc aperture base.
This resource is used along with the device type, which could
be DEVICE_PRIVATE or DEVICE_GENERIC to create the device
page map region.
Sign
new ioctl cmd added to query zone device type. This will be
used once the test_hmm adds zone device generic type.
Signed-off-by: Alex Sierra
---
lib/test_hmm.c | 15 ++-
lib/test_hmm_uapi.h | 7 +++
2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/lib/test_hmm
From: Ralph Campbell
There are several places where ZONE_DEVICE struct pages assume a reference
count == 1 means the page is idle and free. Instead of open coding this,
add a helper function to hide this detail.
v3:
[AS]: rename dax_layout_is_idle_page func to dax_page_unused
v4:
[AS]: This ref
Add two more parameters to set spm_addr_dev0 & spm_addr_dev1
addresses. These two parameters configure the start SP
addresses for each device in test_hmm driver.
Consequently, this configures zone device type as generic.
Signed-off-by: Alex Sierra
---
tools/testing/selftests/vm/test_hmm.sh | 20
Device Generic type uses device memory that is coherently
accesible by the CPU. Usually, this is shown as SP
(special purpose) memory range at the BIOS-e820 memory
enumeration. If no SP memory is supported in system,
this could be faked by setting CONFIG_EFI_FAKE_MEMMAP.
Currently, test_hmm only s
From: Ralph Campbell
ZONE_DEVICE struct pages have an extra reference count that complicates the
code for put_page() and several places in the kernel that need to check the
reference count to see that a page is not being used (gup, compaction,
migration, etc.). Clean up the code so the reference
Test cases such as migrate_fault and migrate_multiple,
were modified to explicit migrate from device to sys memory
without the need of page faults, when using device generic
type.
Snapshot test case updated to read memory device type
first and based on that, get the proper returned results
migrate
Two helpers added. One checks if zone device page is generic
type. The other if page is either private or generic type.
Signed-off-by: Alex Sierra
---
include/linux/mm.h | 8
1 file changed, 8 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index d8d79bb94be8..f5b247
In order to configure device generic in test_hmm, two
module parameters should be passed, which correspon to the
SP start address of each device (2) spm_addr_dev0 &
spm_addr_dev1. If no parameters are passed, private device
type is configured.
Signed-off-by: Alex Sierra
---
lib/test_hmm.c |
On 7/16/2021 5:14 PM, Felix Kuehling wrote:
Am 2021-07-16 um 11:07 a.m. schrieb Theodore Y. Ts'o:
On Wed, Jun 23, 2021 at 05:49:55PM -0400, Felix Kuehling wrote:
I can think of two ways to test the changes for MEMORY_DEVICE_GENERIC in
this patch series in a way that is reproducible without spe
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