1 files changed, 0 insertions, 325 deletions
diff --git a/drivers/gpu/drm/xe/xe_hmm.c b/drivers/gpu/drm/xe/xe_hmm.c
deleted file mode 100644
index 57b71956ddf4..000000000000
--- a/drivers/gpu/drm/xe/xe_hmm.c
+++ /dev/null
@@ -1,325 +0,0 @@
-// SPDX-License-Identifier: MIT
-/*
- * Copyright © 2024 Intel Corporation
- */
-
-#include <linux/scatterlist.h>
-#include <linux/mmu_notifier.h>
-#include <linux/dma-mapping.h>
-#include <linux/memremap.h>
-#include <linux/swap.h>
-#include <linux/hmm.h>
-#include <linux/mm.h>
-#include "xe_hmm.h"
-#include "xe_vm.h"
-#include "xe_bo.h"
-
-static u64 xe_npages_in_range(unsigned long start, unsigned long end)
-{
-	return (end - start) >> PAGE_SHIFT;
-}
-
-static int xe_alloc_sg(struct xe_device *xe, struct sg_table *st,
-		       struct hmm_range *range, struct rw_semaphore *notifier_sem)
-{
-	unsigned long i, npages, hmm_pfn;
-	unsigned long num_chunks = 0;
-	int ret;
-
-	/* HMM docs says this is needed. */
-	ret = down_read_interruptible(notifier_sem);
-	if (ret)
-		return ret;
-
-	if (mmu_interval_read_retry(range->notifier, range->notifier_seq)) {
-		up_read(notifier_sem);
-		return -EAGAIN;
-	}
-
-	npages = xe_npages_in_range(range->start, range->end);
-	for (i = 0; i < npages;) {
-		unsigned long len;
-
-		hmm_pfn = range->hmm_pfns[i];
-		xe_assert(xe, hmm_pfn & HMM_PFN_VALID);
-
-		len = 1UL << hmm_pfn_to_map_order(hmm_pfn);
-
-		/* If order > 0 the page may extend beyond range->start */
-		len -= (hmm_pfn & ~HMM_PFN_FLAGS) & (len - 1);
-		i += len;
-		num_chunks++;
-	}
-	up_read(notifier_sem);
-
-	return sg_alloc_table(st, num_chunks, GFP_KERNEL);
-}
-
-/**
- * xe_build_sg() - build a scatter gather table for all the physical pages/pfn
- * in a hmm_range. dma-map pages if necessary. dma-address is save in sg table
- * and will be used to program GPU page table later.
- * @xe: the xe device who will access the dma-address in sg table
- * @range: the hmm range that we build the sg table from. range->hmm_pfns[]
- * has the pfn numbers of pages that back up this hmm address range.
- * @st: pointer to the sg table.
- * @notifier_sem: The xe notifier lock.
- * @write: whether we write to this range. This decides dma map direction
- * for system pages. If write we map it bi-diretional; otherwise
- * DMA_TO_DEVICE
- *
- * All the contiguous pfns will be collapsed into one entry in
- * the scatter gather table. This is for the purpose of efficiently
- * programming GPU page table.
- *
- * The dma_address in the sg table will later be used by GPU to
- * access memory. So if the memory is system memory, we need to
- * do a dma-mapping so it can be accessed by GPU/DMA.
- *
- * FIXME: This function currently only support pages in system
- * memory. If the memory is GPU local memory (of the GPU who
- * is going to access memory), we need gpu dpa (device physical
- * address), and there is no need of dma-mapping. This is TBD.
- *
- * FIXME: dma-mapping for peer gpu device to access remote gpu's
- * memory. Add this when you support p2p
- *
- * This function allocates the storage of the sg table. It is
- * caller's responsibility to free it calling sg_free_table.
- *
- * Returns 0 if successful; -ENOMEM if fails to allocate memory
- */
-static int xe_build_sg(struct xe_device *xe, struct hmm_range *range,
-		       struct sg_table *st,
-		       struct rw_semaphore *notifier_sem,
-		       bool write)
-{
-	unsigned long npages = xe_npages_in_range(range->start, range->end);
-	struct device *dev = xe->drm.dev;
-	struct scatterlist *sgl;
-	struct page *page;
-	unsigned long i, j;
-
-	lockdep_assert_held(notifier_sem);
-
-	i = 0;
-	for_each_sg(st->sgl, sgl, st->nents, j) {
-		unsigned long hmm_pfn, size;
-
-		hmm_pfn = range->hmm_pfns[i];
-		page = hmm_pfn_to_page(hmm_pfn);
-		xe_assert(xe, !is_device_private_page(page));
-
-		size = 1UL << hmm_pfn_to_map_order(hmm_pfn);
-		size -= page_to_pfn(page) & (size - 1);
-		i += size;
-
-		if (unlikely(j == st->nents - 1)) {
-			xe_assert(xe, i >= npages);
-			if (i > npages)
-				size -= (i - npages);
-
-			sg_mark_end(sgl);
-		} else {
-			xe_assert(xe, i < npages);
-		}
-
-		sg_set_page(sgl, page, size << PAGE_SHIFT, 0);
-	}
-
-	return dma_map_sgtable(dev, st, write ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE,
-			       DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_NO_KERNEL_MAPPING);
-}
-
-static void xe_hmm_userptr_set_mapped(struct xe_userptr_vma *uvma)
-{
-	struct xe_userptr *userptr = &uvma->userptr;
-	struct xe_vm *vm = xe_vma_vm(&uvma->vma);
-
-	lockdep_assert_held_write(&vm->lock);
-	lockdep_assert_held(&vm->userptr.notifier_lock);
-
-	mutex_lock(&userptr->unmap_mutex);
-	xe_assert(vm->xe, !userptr->mapped);
-	userptr->mapped = true;
-	mutex_unlock(&userptr->unmap_mutex);
-}
-
-void xe_hmm_userptr_unmap(struct xe_userptr_vma *uvma)
-{
-	struct xe_userptr *userptr = &uvma->userptr;
-	struct xe_vma *vma = &uvma->vma;
-	bool write = !xe_vma_read_only(vma);
-	struct xe_vm *vm = xe_vma_vm(vma);
-	struct xe_device *xe = vm->xe;
-
-	if (!lockdep_is_held_type(&vm->userptr.notifier_lock, 0) &&
-	    !lockdep_is_held_type(&vm->lock, 0) &&
-	    !(vma->gpuva.flags & XE_VMA_DESTROYED)) {
-		/* Don't unmap in exec critical section. */
-		xe_vm_assert_held(vm);
-		/* Don't unmap while mapping the sg. */
-		lockdep_assert_held(&vm->lock);
-	}
-
-	mutex_lock(&userptr->unmap_mutex);
-	if (userptr->sg && userptr->mapped)
-		dma_unmap_sgtable(xe->drm.dev, userptr->sg,
-				  write ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE, 0);
-	userptr->mapped = false;
-	mutex_unlock(&userptr->unmap_mutex);
-}
-
-/**
- * xe_hmm_userptr_free_sg() - Free the scatter gather table of userptr
- * @uvma: the userptr vma which hold the scatter gather table
- *
- * With function xe_userptr_populate_range, we allocate storage of
- * the userptr sg table. This is a helper function to free this
- * sg table, and dma unmap the address in the table.
- */
-void xe_hmm_userptr_free_sg(struct xe_userptr_vma *uvma)
-{
-	struct xe_userptr *userptr = &uvma->userptr;
-
-	xe_assert(xe_vma_vm(&uvma->vma)->xe, userptr->sg);
-	xe_hmm_userptr_unmap(uvma);
-	sg_free_table(userptr->sg);
-	userptr->sg = NULL;
-}
-
-/**
- * xe_hmm_userptr_populate_range() - Populate physical pages of a virtual
- * address range
- *
- * @uvma: userptr vma which has information of the range to populate.
- * @is_mm_mmap_locked: True if mmap_read_lock is already acquired by caller.
- *
- * This function populate the physical pages of a virtual
- * address range. The populated physical pages is saved in
- * userptr's sg table. It is similar to get_user_pages but call
- * hmm_range_fault.
- *
- * This function also read mmu notifier sequence # (
- * mmu_interval_read_begin), for the purpose of later
- * comparison (through mmu_interval_read_retry).
- *
- * This must be called with mmap read or write lock held.
- *
- * This function allocates the storage of the userptr sg table.
- * It is caller's responsibility to free it calling sg_free_table.
- *
- * returns: 0 for success; negative error no on failure
- */
-int xe_hmm_userptr_populate_range(struct xe_userptr_vma *uvma,
-				  bool is_mm_mmap_locked)
-{
-	unsigned long timeout =
-		jiffies + msecs_to_jiffies(HMM_RANGE_DEFAULT_TIMEOUT);
-	unsigned long *pfns;
-	struct xe_userptr *userptr;
-	struct xe_vma *vma = &uvma->vma;
-	u64 userptr_start = xe_vma_userptr(vma);
-	u64 userptr_end = userptr_start + xe_vma_size(vma);
-	struct xe_vm *vm = xe_vma_vm(vma);
-	struct hmm_range hmm_range = {
-		.pfn_flags_mask = 0, /* ignore pfns */
-		.default_flags = HMM_PFN_REQ_FAULT,
-		.start = userptr_start,
-		.end = userptr_end,
-		.notifier = &uvma->userptr.notifier,
-		.dev_private_owner = vm->xe,
-	};
-	bool write = !xe_vma_read_only(vma);
-	unsigned long notifier_seq;
-	u64 npages;
-	int ret;
-
-	userptr = &uvma->userptr;
-
-	if (is_mm_mmap_locked)
-		mmap_assert_locked(userptr->notifier.mm);
-
-	if (vma->gpuva.flags & XE_VMA_DESTROYED)
-		return 0;
-
-	notifier_seq = mmu_interval_read_begin(&userptr->notifier);
-	if (notifier_seq == userptr->notifier_seq)
-		return 0;
-
-	if (userptr->sg)
-		xe_hmm_userptr_free_sg(uvma);
-
-	npages = xe_npages_in_range(userptr_start, userptr_end);
-	pfns = kvmalloc_array(npages, sizeof(*pfns), GFP_KERNEL);
-	if (unlikely(!pfns))
-		return -ENOMEM;
-
-	if (write)
-		hmm_range.default_flags |= HMM_PFN_REQ_WRITE;
-
-	if (!mmget_not_zero(userptr->notifier.mm)) {
-		ret = -EFAULT;
-		goto free_pfns;
-	}
-
-	hmm_range.hmm_pfns = pfns;
-
-	while (true) {
-		hmm_range.notifier_seq = mmu_interval_read_begin(&userptr->notifier);
-
-		if (!is_mm_mmap_locked)
-			mmap_read_lock(userptr->notifier.mm);
-
-		ret = hmm_range_fault(&hmm_range);
-
-		if (!is_mm_mmap_locked)
-			mmap_read_unlock(userptr->notifier.mm);
-
-		if (ret == -EBUSY) {
-			if (time_after(jiffies, timeout))
-				break;
-
-			continue;
-		}
-		break;
-	}
-
-	mmput(userptr->notifier.mm);
-
-	if (ret)
-		goto free_pfns;
-
-	ret = xe_alloc_sg(vm->xe, &userptr->sgt, &hmm_range, &vm->userptr.notifier_lock);
-	if (ret)
-		goto free_pfns;
-
-	ret = down_read_interruptible(&vm->userptr.notifier_lock);
-	if (ret)
-		goto free_st;
-
-	if (mmu_interval_read_retry(hmm_range.notifier, hmm_range.notifier_seq)) {
-		ret = -EAGAIN;
-		goto out_unlock;
-	}
-
-	ret = xe_build_sg(vm->xe, &hmm_range, &userptr->sgt,
-			  &vm->userptr.notifier_lock, write);
-	if (ret)
-		goto out_unlock;
-
-	userptr->sg = &userptr->sgt;
-	xe_hmm_userptr_set_mapped(uvma);
-	userptr->notifier_seq = hmm_range.notifier_seq;
-	up_read(&vm->userptr.notifier_lock);
-	kvfree(pfns);
-	return 0;
-
-out_unlock:
-	up_read(&vm->userptr.notifier_lock);
-free_st:
-	sg_free_table(&userptr->sgt);
-free_pfns:
-	kvfree(pfns);
-	return ret;
-}