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drm/xe: Add atomic_svm_timeslice_ms debugfs entry

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Add some informal control for atomic SVM fault GPU timeslice to be able
to play around with values and tweak performance.

v2:
 - Reduce timeslice default value to 5ms

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://lore.kernel.org/r/20250512135500.1405019-6-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2025-05-12 06:54:59 -07:00
parent a5d8d3be1d
commit 1b894c2246
4 changed files with 44 additions and 1 deletions
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38
drivers/gpu/drm/xe/xe_debugfs.c
View File

@ -191,6 +191,41 @@ static const struct file_operations wedged_mode_fops = {
.write = wedged_mode_set,
};
static ssize_t atomic_svm_timeslice_ms_show(struct file *f, char __user *ubuf,
size_t size, loff_t *pos)
{
struct xe_device *xe = file_inode(f)->i_private;
char buf[32];
int len = 0;
len = scnprintf(buf, sizeof(buf), "%d\n", xe->atomic_svm_timeslice_ms);
return simple_read_from_buffer(ubuf, size, pos, buf, len);
}
static ssize_t atomic_svm_timeslice_ms_set(struct file *f,
const char __user *ubuf,
size_t size, loff_t *pos)
{
struct xe_device *xe = file_inode(f)->i_private;
u32 atomic_svm_timeslice_ms;
ssize_t ret;
ret = kstrtouint_from_user(ubuf, size, 0, &atomic_svm_timeslice_ms);
if (ret)
return ret;
xe->atomic_svm_timeslice_ms = atomic_svm_timeslice_ms;
return size;
}
static const struct file_operations atomic_svm_timeslice_ms_fops = {
.owner = THIS_MODULE,
.read = atomic_svm_timeslice_ms_show,
.write = atomic_svm_timeslice_ms_set,
};
void xe_debugfs_register(struct xe_device *xe)
{
struct ttm_device *bdev = &xe->ttm;
@ -211,6 +246,9 @@ void xe_debugfs_register(struct xe_device *xe)
debugfs_create_file("wedged_mode", 0600, root, xe,
&wedged_mode_fops);
debugfs_create_file("atomic_svm_timeslice_ms", 0600, root, xe,
&atomic_svm_timeslice_ms_fops);
for (mem_type = XE_PL_VRAM0; mem_type <= XE_PL_VRAM1; ++mem_type) {
man = ttm_manager_type(bdev, mem_type);

1
drivers/gpu/drm/xe/xe_device.c
View File

@ -442,6 +442,7 @@ struct xe_device *xe_device_create(struct pci_dev *pdev,
xe->info.devid = pdev->device;
xe->info.revid = pdev->revision;
xe->info.force_execlist = xe_modparam.force_execlist;
xe->atomic_svm_timeslice_ms = 5;
err = xe_irq_init(xe);
if (err)

3
drivers/gpu/drm/xe/xe_device_types.h
View File

@ -571,6 +571,9 @@ struct xe_device {
/** @pmu: performance monitoring unit */
struct xe_pmu pmu;
/** @atomic_svm_timeslice_ms: Atomic SVM fault timeslice MS */
u32 atomic_svm_timeslice_ms;
#ifdef TEST_VM_OPS_ERROR
/**
* @vm_inject_error_position: inject errors at different places in VM

3
drivers/gpu/drm/xe/xe_svm.c
View File

@ -798,7 +798,8 @@ int xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma,
.devmem_only = atomic && IS_DGFX(vm->xe) &&
IS_ENABLED(CONFIG_DRM_XE_DEVMEM_MIRROR),
.timeslice_ms = atomic && IS_DGFX(vm->xe) &&
IS_ENABLED(CONFIG_DRM_XE_DEVMEM_MIRROR) ? 5 : 0,
IS_ENABLED(CONFIG_DRM_XE_DEVMEM_MIRROR) ?
vm->xe->atomic_svm_timeslice_ms : 0,
};
struct xe_svm_range *range;
struct drm_gpusvm_range *r;