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drm/amdkfd: report pcie bandwidth to the kfd

Browse source 
Similar to xGMI reporting the min/max bandwidth between direct peers, PCIe
will report the min/max bandwidth to the KFD.

Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jonathan Kim 2021-06-02 09:46:16 -04:00 committed by Alex Deucher
parent 3f46c4e9ce
commit 9330481038
3 changed files with 64 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

59
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
View file

@ -21,6 +21,7 @@
*/
#include "amdgpu_amdkfd.h"
#include "amd_pcie.h"
#include "amd_shared.h"
#include "amdgpu.h"
@ -577,6 +578,64 @@ int amdgpu_amdkfd_get_xgmi_bandwidth_mbytes(struct kgd_dev *dst, struct kgd_dev
return (num_links * 16 * 25000)/BITS_PER_BYTE;
}
int amdgpu_amdkfd_get_pcie_bandwidth_mbytes(struct kgd_dev *dev, bool is_min)
{
struct amdgpu_device *adev = (struct amdgpu_device *)dev;
int num_lanes_shift = (is_min ? ffs(adev->pm.pcie_mlw_mask) :
fls(adev->pm.pcie_mlw_mask)) - 1;
int gen_speed_shift = (is_min ? ffs(adev->pm.pcie_gen_mask &
CAIL_PCIE_LINK_SPEED_SUPPORT_MASK) :
fls(adev->pm.pcie_gen_mask &
CAIL_PCIE_LINK_SPEED_SUPPORT_MASK)) - 1;
uint32_t num_lanes_mask = 1 << num_lanes_shift;
uint32_t gen_speed_mask = 1 << gen_speed_shift;
int num_lanes_factor = 0, gen_speed_mbits_factor = 0;
switch (num_lanes_mask) {
case CAIL_PCIE_LINK_WIDTH_SUPPORT_X1:
num_lanes_factor = 1;
break;
case CAIL_PCIE_LINK_WIDTH_SUPPORT_X2:
num_lanes_factor = 2;
break;
case CAIL_PCIE_LINK_WIDTH_SUPPORT_X4:
num_lanes_factor = 4;
break;
case CAIL_PCIE_LINK_WIDTH_SUPPORT_X8:
num_lanes_factor = 8;
break;
case CAIL_PCIE_LINK_WIDTH_SUPPORT_X12:
num_lanes_factor = 12;
break;
case CAIL_PCIE_LINK_WIDTH_SUPPORT_X16:
num_lanes_factor = 16;
break;
case CAIL_PCIE_LINK_WIDTH_SUPPORT_X32:
num_lanes_factor = 32;
break;
}
switch (gen_speed_mask) {
case CAIL_PCIE_LINK_SPEED_SUPPORT_GEN1:
gen_speed_mbits_factor = 2500;
break;
case CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2:
gen_speed_mbits_factor = 5000;
break;
case CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3:
gen_speed_mbits_factor = 8000;
break;
case CAIL_PCIE_LINK_SPEED_SUPPORT_GEN4:
gen_speed_mbits_factor = 16000;
break;
case CAIL_PCIE_LINK_SPEED_SUPPORT_GEN5:
gen_speed_mbits_factor = 32000;
break;
}
return (num_lanes_factor * gen_speed_mbits_factor)/BITS_PER_BYTE;
}
uint64_t amdgpu_amdkfd_get_mmio_remap_phys_addr(struct kgd_dev *kgd)
{
struct amdgpu_device *adev = (struct amdgpu_device *)kgd;

1
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
View file

@ -227,6 +227,7 @@ uint32_t amdgpu_amdkfd_get_asic_rev_id(struct kgd_dev *kgd);
int amdgpu_amdkfd_get_noretry(struct kgd_dev *kgd);
uint8_t amdgpu_amdkfd_get_xgmi_hops_count(struct kgd_dev *dst, struct kgd_dev *src);
int amdgpu_amdkfd_get_xgmi_bandwidth_mbytes(struct kgd_dev *dst, struct kgd_dev *src, bool is_min);
int amdgpu_amdkfd_get_pcie_bandwidth_mbytes(struct kgd_dev *dev, bool is_min);
/* Read user wptr from a specified user address space with page fault
* disabled. The memory must be pinned and mapped to the hardware when

4
drivers/gpu/drm/amd/amdkfd/kfd_crat.c
View file

@ -1998,6 +1998,10 @@ static int kfd_fill_gpu_direct_io_link_to_cpu(int *avail_size,
}
} else {
sub_type_hdr->io_interface_type = CRAT_IOLINK_TYPE_PCIEXPRESS;
sub_type_hdr->minimum_bandwidth_mbs =
amdgpu_amdkfd_get_pcie_bandwidth_mbytes(kdev->kgd, true);
sub_type_hdr->maximum_bandwidth_mbs =
amdgpu_amdkfd_get_pcie_bandwidth_mbytes(kdev->kgd, false);
}
sub_type_hdr->proximity_domain_from = proximity_domain;