回复: [PATCH v2] drm/amdgpu: Put drm_dev_enter/exit outside hot codepath
Pan, Xinhui
Xinhui.Pan at amd.com
Wed Sep 15 06:42:45 UTC 2021
[AMD Official Use Only]
Andrey
I hit panic with this plug/unplug test without this patch.
But as we add enter/exit in all its callers. maybe it would not impact plug/unplug.
[ 1109.041095] BUG: unable to handle page fault for address: 00000000000010e1
[ 1109.086353] RIP: 0010:vega10_power_gate_vce+0x15/0x40 [amdgpu]
[ 1109.196706] Call Trace:
[ 1109.199374] ? pp_set_powergating_by_smu+0x1f9/0x4a0 [amdgpu]
[ 1109.205843] amdgpu_dpm_set_powergating_by_smu+0xa6/0x150 [amdgpu]
[ 1109.212776] amdgpu_dpm_enable_vce+0x36/0x100 [amdgpu]
[ 1109.218563] vce_v4_0_hw_fini+0xe1/0xf0 [amdgpu]
[ 1109.223747] amdgpu_device_fini_hw+0x333/0x483 [amdgpu]
[ 1109.229650] amdgpu_driver_unload_kms+0x80/0xe0 [amdgpu]
[ 1109.235577] amdgpu_pci_remove+0x37/0x70 [amdgpu]
[ 1109.240853] pci_device_remove+0x3b/0xb0
[ 1109.245127] device_release_driver_internal+0x100/0x1d0
[ 1109.250857] device_release_driver+0x12/0x20
[ 1109.255535] pci_stop_bus_device+0x79/0xa0
[ 1109.260016] pci_stop_and_remove_bus_device_locked+0x1b/0x30
[ 1109.266197] remove_store+0x7b/0x90
[ 1109.269990] dev_attr_store+0x14/0x30
[ 1109.274002] sysfs_kf_write+0x48/0x60
[ 1109.277998] kernfs_fop_write_iter+0x14e/0x1e0
________________________________________
发件人: Pan, Xinhui <Xinhui.Pan at amd.com>
发送时间: 2021年9月15日 14:37
收件人: amd-gfx at lists.freedesktop.org
抄送: Deucher, Alexander; Koenig, Christian; Grodzovsky, Andrey; Pan, Xinhui
主题: [PATCH v2] drm/amdgpu: Put drm_dev_enter/exit outside hot codepath
We hit soft hang while doing memory pressure test on one numa system.
After a qucik look, this is because kfd invalid/valid userptr memory
frequently with process_info lock hold.
Looks like update page table mapping use too much cpu time.
perf top says below,
75.81% [kernel] [k] __srcu_read_unlock
6.19% [amdgpu] [k] amdgpu_gmc_set_pte_pde
3.56% [kernel] [k] __srcu_read_lock
2.20% [amdgpu] [k] amdgpu_vm_cpu_update
2.20% [kernel] [k] __sg_page_iter_dma_next
2.15% [drm] [k] drm_dev_enter
1.70% [drm] [k] drm_prime_sg_to_dma_addr_array
1.18% [kernel] [k] __sg_alloc_table_from_pages
1.09% [drm] [k] drm_dev_exit
So move drm_dev_enter/exit outside gmc code, instead let caller do it.
They are gart_unbind, gart_map, vm_clear_bo, vm_update_pdes and
gmc_init_pdb0. vm_bo_update_mapping already calls it.
Signed-off-by: xinhui pan <xinhui.pan at amd.com>
---
change from v1:
add enter/exit in more gmc_set_pte_pde callers
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c | 11 ++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 11 +++++-----
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 28 +++++++++++++++++-------
3 files changed, 36 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
index 76efd5f8950f..d7e4f4660acf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
@@ -34,6 +34,7 @@
#include <asm/set_memory.h>
#endif
#include "amdgpu.h"
+#include <drm/drm_drv.h>
/*
* GART
@@ -230,12 +231,16 @@ int amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
u64 page_base;
/* Starting from VEGA10, system bit must be 0 to mean invalid. */
uint64_t flags = 0;
+ int idx;
if (!adev->gart.ready) {
WARN(1, "trying to unbind memory from uninitialized GART !\n");
return -EINVAL;
}
+ if (!drm_dev_enter(&adev->ddev, &idx))
+ return 0;
+
t = offset / AMDGPU_GPU_PAGE_SIZE;
p = t / AMDGPU_GPU_PAGES_IN_CPU_PAGE;
for (i = 0; i < pages; i++, p++) {
@@ -254,6 +259,7 @@ int amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
for (i = 0; i < adev->num_vmhubs; i++)
amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 0);
+ drm_dev_exit(idx);
return 0;
}
@@ -276,12 +282,16 @@ int amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
{
uint64_t page_base;
unsigned i, j, t;
+ int idx;
if (!adev->gart.ready) {
WARN(1, "trying to bind memory to uninitialized GART !\n");
return -EINVAL;
}
+ if (!drm_dev_enter(&adev->ddev, &idx))
+ return 0;
+
t = offset / AMDGPU_GPU_PAGE_SIZE;
for (i = 0; i < pages; i++) {
@@ -291,6 +301,7 @@ int amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
page_base += AMDGPU_GPU_PAGE_SIZE;
}
}
+ drm_dev_exit(idx);
return 0;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 54f059501a33..1427fd70310c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -153,10 +153,6 @@ int amdgpu_gmc_set_pte_pde(struct amdgpu_device *adev, void *cpu_pt_addr,
{
void __iomem *ptr = (void *)cpu_pt_addr;
uint64_t value;
- int idx;
-
- if (!drm_dev_enter(&adev->ddev, &idx))
- return 0;
/*
* The following is for PTE only. GART does not have PDEs.
@@ -165,8 +161,6 @@ int amdgpu_gmc_set_pte_pde(struct amdgpu_device *adev, void *cpu_pt_addr,
value |= flags;
writeq(value, ptr + (gpu_page_idx * 8));
- drm_dev_exit(idx);
-
return 0;
}
@@ -752,6 +746,10 @@ void amdgpu_gmc_init_pdb0(struct amdgpu_device *adev)
adev->gmc.xgmi.physical_node_id * adev->gmc.xgmi.node_segment_size;
u64 vram_end = vram_addr + vram_size;
u64 gart_ptb_gpu_pa = amdgpu_gmc_vram_pa(adev, adev->gart.bo);
+ int idx;
+
+ if (!drm_dev_enter(&adev->ddev, &idx))
+ return;
flags |= AMDGPU_PTE_VALID | AMDGPU_PTE_READABLE;
flags |= AMDGPU_PTE_WRITEABLE;
@@ -773,6 +771,7 @@ void amdgpu_gmc_init_pdb0(struct amdgpu_device *adev)
flags |= AMDGPU_PDE_BFS(0) | AMDGPU_PTE_SNOOPED;
/* Requires gart_ptb_gpu_pa to be 4K aligned */
amdgpu_gmc_set_pte_pde(adev, adev->gmc.ptr_pdb0, i, gart_ptb_gpu_pa, flags);
+ drm_dev_exit(idx);
}
/**
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 0126ece898da..daa16d2f89da 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -800,7 +800,7 @@ static int amdgpu_vm_clear_bo(struct amdgpu_device *adev,
struct amdgpu_bo *bo = &vmbo->bo;
unsigned entries, ats_entries;
uint64_t addr;
- int r;
+ int r, idx;
/* Figure out our place in the hierarchy */
if (ancestor->parent) {
@@ -845,9 +845,12 @@ static int amdgpu_vm_clear_bo(struct amdgpu_device *adev,
return r;
}
+ if (!drm_dev_enter(&adev->ddev, &idx))
+ return -ENODEV;
+
r = vm->update_funcs->map_table(vmbo);
if (r)
- return r;
+ goto exit;
memset(¶ms, 0, sizeof(params));
params.adev = adev;
@@ -856,7 +859,7 @@ static int amdgpu_vm_clear_bo(struct amdgpu_device *adev,
r = vm->update_funcs->prepare(¶ms, NULL, AMDGPU_SYNC_EXPLICIT);
if (r)
- return r;
+ goto exit;
addr = 0;
if (ats_entries) {
@@ -872,7 +875,7 @@ static int amdgpu_vm_clear_bo(struct amdgpu_device *adev,
r = vm->update_funcs->update(¶ms, vmbo, addr, 0, ats_entries,
value, flags);
if (r)
- return r;
+ goto exit;
addr += ats_entries * 8;
}
@@ -895,10 +898,13 @@ static int amdgpu_vm_clear_bo(struct amdgpu_device *adev,
r = vm->update_funcs->update(¶ms, vmbo, addr, 0, entries,
value, flags);
if (r)
- return r;
+ goto exit;
}
- return vm->update_funcs->commit(¶ms, NULL);
+ r = vm->update_funcs->commit(¶ms, NULL);
+exit:
+ drm_dev_exit(idx);
+ return r;
}
/**
@@ -1384,11 +1390,14 @@ int amdgpu_vm_update_pdes(struct amdgpu_device *adev,
struct amdgpu_vm *vm, bool immediate)
{
struct amdgpu_vm_update_params params;
- int r;
+ int r, idx;
if (list_empty(&vm->relocated))
return 0;
+ if (!drm_dev_enter(&adev->ddev, &idx))
+ return -ENODEV;
+
memset(¶ms, 0, sizeof(params));
params.adev = adev;
params.vm = vm;
@@ -1396,7 +1405,7 @@ int amdgpu_vm_update_pdes(struct amdgpu_device *adev,
r = vm->update_funcs->prepare(¶ms, NULL, AMDGPU_SYNC_EXPLICIT);
if (r)
- return r;
+ goto exit;
while (!list_empty(&vm->relocated)) {
struct amdgpu_vm_bo_base *entry;
@@ -1414,10 +1423,13 @@ int amdgpu_vm_update_pdes(struct amdgpu_device *adev,
r = vm->update_funcs->commit(¶ms, &vm->last_update);
if (r)
goto error;
+ drm_dev_exit(idx);
return 0;
error:
amdgpu_vm_invalidate_pds(adev, vm);
+exit:
+ drm_dev_exit(idx);
return r;
}
--
2.25.1
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