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This replaces the previous standalone debugfs approach > with the standard kernel fault-inject infrastructure. > > Two debugfs entries are created under the xe debugfs root for > CRI platforms: > - inject_mempage_offline/: Standard fault-inject knobs (probability, > times, interval, etc.) created by fault_create_debugfs_attr(). > Without CONFIG_FAULT_INJECTION_DEBUG_FS, the stub returns > ERR_PTR(-ENODEV) and no knobs are created, making the trigger > effectively a no-op. > - inject_mempage_offline_trigger: Write a PFN value to inject a > specific page, or write "0" to auto-pick the last unallocated > VRAM page > > The trigger accepts: > - "0" : auto-pick last unallocated page > - "0xPFN" : inject fault at a specific PFN address > > Usage: > echo 100 > inject_mempage_offline/probability > echo 1 > inject_mempage_offline/times > echo 0 > inject_mempage_offline_trigger > > probability: likelihood of should_fail() returning true (0-100) > times: number of times injection is allowed (-1 for unlimited) > > v5(Sashiko): > - exclude SRIOV and remove dpa_base addition, already absolute dpa > v4(Himal): > - Use xe_fault_mempage_offline() instead of IS_ENABLED() + > direct should_fail(). CONFIG_FAULT_INJECTION_DEBUG_FS is now > an implicit requirement for the trigger to function. > v3(Himal): > - Use FAULT_ACTION > v2(sashiko): > - use cond_resched() > - validate input first and fix addr < 0 case > - validate vr, move block, found var as local to scope_guard Seems reclaiming the page at addr is left to unbind/bind of driver. Need doc for that? Multiple fault injection at random offset might make contigous vram allocation problematic. > > Signed-off-by: Tejas Upadhyay > --- > drivers/gpu/drm/xe/xe_debugfs.c | 47 +++++++++++++++++++++++++ > drivers/gpu/drm/xe/xe_debugfs.h | 2 ++ > drivers/gpu/drm/xe/xe_ttm_vram_mgr.c | 52 ++++++++++++++++++++++++++++ > drivers/gpu/drm/xe/xe_ttm_vram_mgr.h | 1 + > 4 files changed, 102 insertions(+) > > diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c > index e19eafffbb08..003abf4af2e3 100644 > --- a/drivers/gpu/drm/xe/xe_debugfs.c > +++ b/drivers/gpu/drm/xe/xe_debugfs.c > @@ -45,12 +45,18 @@ > DECLARE_FAULT_ATTR(gt_reset_failure); > DECLARE_FAULT_ATTR(inject_csc_hw_error); > DECLARE_FAULT_ATTR(wedge_cold_reset); > +DECLARE_FAULT_ATTR(inject_mempage_offline); > > static bool csc_hw_error_available(struct xe_device *xe) > { > return !IS_SRIOV_VF(xe) && xe->info.platform == XE_BATTLEMAGE; > } > > +static bool is_crescent_island_pf(struct xe_device *xe) > +{ > + return !IS_SRIOV_VF(xe) && xe->info.platform == XE_CRESCENTISLAND; > +} > + > /* > * Fault injection table. Each entry registers a debugfs attribute; add a > * matching FAULT_ACTION() below for every entry added here. > @@ -67,6 +73,9 @@ static struct { > .is_visible = csc_hw_error_available }, > { .name = "wedge_cold_reset", > .attr = &wedge_cold_reset }, > + { .name = "inject_mempage_offline", > + .attr = &inject_mempage_offline, > + .is_visible = is_crescent_island_pf }, > }; > > /* > @@ -82,6 +91,39 @@ bool xe_fault_##name(void) \ > FAULT_ACTION(gt_reset, gt_reset_failure) > FAULT_ACTION(csc_hw_error, inject_csc_hw_error) > FAULT_ACTION(wedge_cold_reset, wedge_cold_reset) > +FAULT_ACTION(mempage_offline, inject_mempage_offline) > + > +static ssize_t inject_mempage_offline_trigger(struct file *f, > + const char __user *ubuf, > + size_t size, loff_t *pos) > +{ > + struct xe_device *xe = file_inode(f)->i_private; > + struct xe_tile *tile = xe_device_get_root_tile(xe); > + struct xe_vram_region *vr = tile->mem.vram; > + u64 pfn; > + int ret; > + > + if (!vr) > + return -ENODEV; > + > + ret = kstrtou64_from_user(ubuf, size, 0, &pfn); > + if (ret) > + return ret; > + > + if (!xe_fault_mempage_offline()) > + return size; > + > + if (pfn == 0) > + return xe_ttm_vram_inject_fault(xe) ?: size; > + > + /* User provided PFN - convert to DPA and inject */ > + return xe_ttm_vram_handle_addr_fault(xe, pfn << PAGE_SHIFT) ?: size; > +} > + > +static const struct file_operations inject_mempage_offline_fops = { > + .owner = THIS_MODULE, > + .write = inject_mempage_offline_trigger, > +}; > > static void xe_fault_inject_debugfs_register(struct xe_device *xe, > struct dentry *root) > @@ -96,6 +138,11 @@ static void xe_fault_inject_debugfs_register(struct xe_device *xe, > fault_create_debugfs_attr(xe_fault_inject_entry[i].name, root, > xe_fault_inject_entry[i].attr); > } > + > + if (is_crescent_island_pf(xe)) { > + debugfs_create_file("inject_mempage_offline_trigger", 0200, > + root, xe, &inject_mempage_offline_fops); > + } > } > > static void read_residency_counter(struct xe_device *xe, struct xe_mmio *mmio, > diff --git a/drivers/gpu/drm/xe/xe_debugfs.h b/drivers/gpu/drm/xe/xe_debugfs.h > index 0dcd28fd7dc0..88d91c78036b 100644 > --- a/drivers/gpu/drm/xe/xe_debugfs.h > +++ b/drivers/gpu/drm/xe/xe_debugfs.h > @@ -14,11 +14,13 @@ struct xe_device; > bool xe_fault_gt_reset(void); > bool xe_fault_csc_hw_error(void); > bool xe_fault_wedge_cold_reset(void); > +bool xe_fault_mempage_offline(void); > void xe_debugfs_register(struct xe_device *xe); > #else > static inline bool xe_fault_gt_reset(void) { return false; } > static inline bool xe_fault_csc_hw_error(void) { return false; } > static inline bool xe_fault_wedge_cold_reset(void) { return false; } > +static inline bool xe_fault_mempage_offline(void) { return false; } > static inline void xe_debugfs_register(struct xe_device *xe) { } > #endif > > diff --git a/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c b/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c > index 8f583f1631bf..c54ad017725f 100644 > --- a/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c > +++ b/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c > @@ -895,6 +895,58 @@ int xe_ttm_vram_handle_addr_fault(struct xe_device *xe, u64 addr) > } > EXPORT_SYMBOL(xe_ttm_vram_handle_addr_fault); > > +/** > + * xe_ttm_vram_inject_fault - Inject a VRAM page fault for testing > + * @xe: xe device instance > + * > + * Picks the last unallocated VRAM page and reports it as faulted > + * via xe_ttm_vram_handle_addr_fault(). Used by the fault-inject > + * debugfs interface for testing page offlining. > + * > + * Return: 0 on success, negative error code on failure. > + */ > +int xe_ttm_vram_inject_fault(struct xe_device *xe) > +{ > + struct xe_tile *tile = xe_device_get_root_tile(xe); > + struct xe_vram_region *vr = tile->mem.vram; > + struct xe_ttm_vram_mgr *vram_mgr = &vr->ttm; > + struct gpu_buddy *mm = &vram_mgr->mm; > + u64 addr; > + > + if (vr->actual_physical_size < SZ_4K) > + return -ENOSPC; > + > + addr = vr->actual_physical_size - SZ_4K; > + while (addr < vr->actual_physical_size) { > + struct gpu_buddy_block *block; > + bool found = false; > + > + scoped_guard(mutex, &vram_mgr->lock) { > + block = gpu_buddy_allocated_addr_to_block(mm, addr); > + if (!block) > + found = true; > + } > + > + /* > + * Intentional race window: xe_ttm_vram_handle_addr_fault() > + * re-acquires vram_mgr->lock internally, so we cannot hold > + * it here. A concurrent allocation claiming this page between > + * the two calls is an acceptable false negative for this > + * test-only path. > + */ > + if (found) > + return xe_ttm_vram_handle_addr_fault(xe, addr + vr->dpa_base); > + > + cond_resched(); > + if (addr == 0) > + break; > + addr -= SZ_4K; > + } > + > + return -ENOSPC; > +} > +EXPORT_SYMBOL(xe_ttm_vram_inject_fault); > + > static int vram_bad_pages_show(struct seq_file *m, void *unused) > { > struct xe_device *xe = m->private; > diff --git a/drivers/gpu/drm/xe/xe_ttm_vram_mgr.h b/drivers/gpu/drm/xe/xe_ttm_vram_mgr.h > index f354c26c4257..8878e36292b2 100644 > --- a/drivers/gpu/drm/xe/xe_ttm_vram_mgr.h > +++ b/drivers/gpu/drm/xe/xe_ttm_vram_mgr.h > @@ -33,6 +33,7 @@ void xe_ttm_vram_get_used(struct ttm_resource_manager *man, > u64 *used, u64 *used_visible); > > int xe_ttm_vram_handle_addr_fault(struct xe_device *xe, u64 addr); > +int xe_ttm_vram_inject_fault(struct xe_device *xe); > void xe_ttm_vram_debugfs_init(struct xe_device *xe, struct dentry *root); > static inline struct xe_ttm_vram_mgr_resource * > to_xe_ttm_vram_mgr_resource(struct ttm_resource *res)