[PATCH v3 08/19] drm/xe/svm: Add xe_svm_ranges_zap_ptes_in_range() for PTE zapping
Himal Prasad Ghimiray
himal.prasad.ghimiray at intel.com
Tue May 27 16:39:52 UTC 2025
Introduce xe_svm_ranges_zap_ptes_in_range(), a function to zap page table
entries (PTEs) for all SVM ranges within a user-specified address range.
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
---
drivers/gpu/drm/xe/xe_svm.c | 43 +++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/xe/xe_svm.h | 7 ++++++
2 files changed, 50 insertions(+)
diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index 59e73187114d..a4d53c24fcbc 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -1006,6 +1006,49 @@ int xe_svm_range_get_pages(struct xe_vm *vm, struct xe_svm_range *range,
return err;
}
+/**
+ * xe_svm_ranges_zap_ptes_in_range - clear ptes of svm ranges in input range
+ * @vm: Pointer to the xe_vm structure
+ * @start: Start of the input range
+ * @end: End of the input range
+ *
+ * This function removes the page table entries (PTEs) associated
+ * with the svm ranges within the given input start amnd end
+ *
+ * Return: tile_mask for which gt's need to be tlb invalidated.
+ */
+u8 xe_svm_ranges_zap_ptes_in_range(struct xe_vm *vm, u64 start, u64 end)
+{
+ struct drm_gpusvm_notifier *notifier;
+ struct xe_svm_range *range;
+ u64 adj_start, adj_end;
+ struct xe_tile *tile;
+ u8 tile_mask = 0;
+ u8 id;
+
+ down_write(&vm->svm.gpusvm.notifier_lock);
+
+ drm_gpusvm_for_each_notifier(notifier, &vm->svm.gpusvm, start, end) {
+ struct drm_gpusvm_range *r = NULL;
+
+ adj_start = max(start, notifier->itree.start);
+ adj_end = min(end, notifier->itree.last + 1);
+ drm_gpusvm_for_each_range(r, notifier, adj_start, adj_end) {
+ range = to_xe_range(r);
+ for_each_tile(tile, vm->xe, id) {
+ if (xe_pt_zap_ptes_range(tile, vm, range)) {
+ tile_mask |= BIT(id);
+ range->tile_invalidated |= BIT(id);
+ }
+ }
+ }
+ }
+
+ up_write(&vm->svm.gpusvm.notifier_lock);
+
+ return tile_mask;
+}
+
#if IS_ENABLED(CONFIG_DRM_XE_DEVMEM_MIRROR)
static struct drm_pagemap_device_addr
diff --git a/drivers/gpu/drm/xe/xe_svm.h b/drivers/gpu/drm/xe/xe_svm.h
index 19ce4f2754a7..af8f285b6caa 100644
--- a/drivers/gpu/drm/xe/xe_svm.h
+++ b/drivers/gpu/drm/xe/xe_svm.h
@@ -91,6 +91,7 @@ bool xe_svm_range_validate(struct xe_vm *vm,
u64 xe_svm_find_vma_start(struct xe_vm *vm, u64 addr, u64 end, struct xe_vma *vma);
+u8 xe_svm_ranges_zap_ptes_in_range(struct xe_vm *vm, u64 start, u64 end);
/**
* xe_svm_range_has_dma_mapping() - SVM range has DMA mapping
* @range: SVM range
@@ -305,6 +306,12 @@ u64 xe_svm_find_vma_start(struct xe_vm *vm, u64 addr, u64 end, struct xe_vma *vm
return ULONG_MAX;
}
+static inline
+u8 xe_svm_ranges_zap_ptes_in_range(struct xe_vm *vm, u64 start, u64 end)
+{
+ return 0;
+}
+
#define xe_svm_assert_in_notifier(...) do {} while (0)
#define xe_svm_range_has_dma_mapping(...) false
--
2.34.1
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