[PATCH 4/7] drm/gpusvm: pull out drm_gpusvm_pages substructure
Matthew Auld
matthew.auld at intel.com
Thu Mar 20 17:30:01 UTC 2025
Pull the pages stuff from the svm range into its own substructure, with
the idea of having the main pages related routines, like get_pages(),
unmap_pages() and free_pages() all operating on some lower level
structures, which can then be re-used for stuff like userptr which wants
to use basic stuff like get_pages(), but not all the other more complex
svm stuff.
Suggested-by: Matthew Brost <matthew.brost at intel.com>
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
---
drivers/gpu/drm/drm_gpusvm.c | 95 +++++++++++++++++++-----------------
drivers/gpu/drm/xe/xe_pt.c | 2 +-
drivers/gpu/drm/xe/xe_svm.c | 6 +--
drivers/gpu/drm/xe/xe_svm.h | 2 +-
include/drm/drm_gpusvm.h | 43 +++++++++-------
5 files changed, 82 insertions(+), 66 deletions(-)
diff --git a/drivers/gpu/drm/drm_gpusvm.c b/drivers/gpu/drm/drm_gpusvm.c
index 5b4ecd36dff1..f27731a51f34 100644
--- a/drivers/gpu/drm/drm_gpusvm.c
+++ b/drivers/gpu/drm/drm_gpusvm.c
@@ -812,7 +812,7 @@ drm_gpusvm_range_alloc(struct drm_gpusvm *gpusvm,
range->itree.last = ALIGN(fault_addr + 1, chunk_size) - 1;
INIT_LIST_HEAD(&range->entry);
range->notifier_seq = LONG_MAX;
- range->flags.migrate_devmem = migrate_devmem ? 1 : 0;
+ range->pages.flags.migrate_devmem = migrate_devmem ? 1 : 0;
return range;
}
@@ -1120,27 +1120,27 @@ drm_gpusvm_range_find_or_insert(struct drm_gpusvm *gpusvm,
EXPORT_SYMBOL_GPL(drm_gpusvm_range_find_or_insert);
/**
- * __drm_gpusvm_range_unmap_pages() - Unmap pages associated with a GPU SVM range (internal)
+ * __drm_gpusvm_unmap_pages() - Unmap pages associated with a GPU SVM range (internal)
* @gpusvm: Pointer to the GPU SVM structure
- * @range: Pointer to the GPU SVM range structure
+ * @svm_pages: Pointer to the GPU SVM pages structure
* @npages: Number of pages to unmap
*
* This function unmap pages associated with a GPU SVM range. Assumes and
* asserts correct locking is in place when called.
*/
-static void __drm_gpusvm_range_unmap_pages(struct drm_gpusvm *gpusvm,
- struct drm_gpusvm_range *range,
- unsigned long npages)
+static void __drm_gpusvm_unmap_pages(struct drm_gpusvm *gpusvm,
+ struct drm_gpusvm_pages *svm_pages,
+ unsigned long npages)
{
unsigned long i, j;
- struct drm_pagemap *dpagemap = range->dpagemap;
+ struct drm_pagemap *dpagemap = svm_pages->dpagemap;
struct device *dev = gpusvm->drm->dev;
lockdep_assert_held(&gpusvm->notifier_lock);
- if (range->flags.has_dma_mapping) {
+ if (svm_pages->flags.has_dma_mapping) {
for (i = 0, j = 0; i < npages; j++) {
- struct drm_pagemap_device_addr *addr = &range->dma_addr[j];
+ struct drm_pagemap_device_addr *addr = &svm_pages->dma_addr[j];
if (addr->proto == DRM_INTERCONNECT_SYSTEM)
dma_unmap_page(dev,
@@ -1152,9 +1152,9 @@ static void __drm_gpusvm_range_unmap_pages(struct drm_gpusvm *gpusvm,
dev, *addr);
i += 1 << addr->order;
}
- range->flags.has_devmem_pages = false;
- range->flags.has_dma_mapping = false;
- range->dpagemap = NULL;
+ svm_pages->flags.has_devmem_pages = false;
+ svm_pages->flags.has_dma_mapping = false;
+ svm_pages->dpagemap = NULL;
}
}
@@ -1165,14 +1165,14 @@ static void __drm_gpusvm_range_unmap_pages(struct drm_gpusvm *gpusvm,
*
* This function frees the dma address array associated with a GPU SVM range.
*/
-static void drm_gpusvm_range_free_pages(struct drm_gpusvm *gpusvm,
- struct drm_gpusvm_range *range)
+static void drm_gpusvm_free_pages(struct drm_gpusvm *gpusvm,
+ struct drm_gpusvm_pages *svm_pages)
{
lockdep_assert_held(&gpusvm->notifier_lock);
- if (range->dma_addr) {
- kvfree(range->dma_addr);
- range->dma_addr = NULL;
+ if (svm_pages->dma_addr) {
+ kvfree(svm_pages->dma_addr);
+ svm_pages->dma_addr = NULL;
}
}
@@ -1200,8 +1200,8 @@ void drm_gpusvm_range_remove(struct drm_gpusvm *gpusvm,
return;
drm_gpusvm_notifier_lock(gpusvm);
- __drm_gpusvm_range_unmap_pages(gpusvm, range, npages);
- drm_gpusvm_range_free_pages(gpusvm, range);
+ __drm_gpusvm_unmap_pages(gpusvm, &range->pages, npages);
+ drm_gpusvm_free_pages(gpusvm, &range->pages);
__drm_gpusvm_range_remove(notifier, range);
drm_gpusvm_notifier_unlock(gpusvm);
@@ -1266,6 +1266,14 @@ void drm_gpusvm_range_put(struct drm_gpusvm_range *range)
}
EXPORT_SYMBOL_GPL(drm_gpusvm_range_put);
+static bool drm_gpusvm_pages_valid(struct drm_gpusvm *gpusvm,
+ struct drm_gpusvm_pages *svm_pages)
+{
+ lockdep_assert_held(&gpusvm->notifier_lock);
+
+ return svm_pages->flags.has_devmem_pages || svm_pages->flags.has_dma_mapping;
+}
+
/**
* drm_gpusvm_range_pages_valid() - GPU SVM range pages valid
* @gpusvm: Pointer to the GPU SVM structure
@@ -1283,9 +1291,7 @@ EXPORT_SYMBOL_GPL(drm_gpusvm_range_put);
bool drm_gpusvm_range_pages_valid(struct drm_gpusvm *gpusvm,
struct drm_gpusvm_range *range)
{
- lockdep_assert_held(&gpusvm->notifier_lock);
-
- return range->flags.has_devmem_pages || range->flags.has_dma_mapping;
+ return drm_gpusvm_pages_valid(gpusvm, &range->pages);
}
EXPORT_SYMBOL_GPL(drm_gpusvm_range_pages_valid);
@@ -1301,17 +1307,17 @@ EXPORT_SYMBOL_GPL(drm_gpusvm_range_pages_valid);
*/
static bool
drm_gpusvm_range_pages_valid_unlocked(struct drm_gpusvm *gpusvm,
- struct drm_gpusvm_range *range)
+ struct drm_gpusvm_pages *svm_pages)
{
bool pages_valid;
- if (!range->dma_addr)
+ if (!svm_pages->dma_addr)
return false;
drm_gpusvm_notifier_lock(gpusvm);
- pages_valid = drm_gpusvm_range_pages_valid(gpusvm, range);
+ pages_valid = drm_gpusvm_pages_valid(gpusvm, svm_pages);
if (!pages_valid)
- drm_gpusvm_range_free_pages(gpusvm, range);
+ drm_gpusvm_free_pages(gpusvm, svm_pages);
drm_gpusvm_notifier_unlock(gpusvm);
return pages_valid;
@@ -1332,6 +1338,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
struct drm_gpusvm_range *range,
const struct drm_gpusvm_ctx *ctx)
{
+ struct drm_gpusvm_pages *svm_pages = &range->pages;
struct mmu_interval_notifier *notifier = &range->notifier->notifier;
struct hmm_range hmm_range = {
.default_flags = HMM_PFN_REQ_FAULT | (ctx->read_only ? 0 :
@@ -1360,7 +1367,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
retry:
hmm_range.notifier_seq = mmu_interval_read_begin(notifier);
- if (drm_gpusvm_range_pages_valid_unlocked(gpusvm, range))
+ if (drm_gpusvm_range_pages_valid_unlocked(gpusvm, svm_pages))
goto set_seqno;
pfns = kvmalloc_array(npages, sizeof(*pfns), GFP_KERNEL);
@@ -1401,7 +1408,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
*/
drm_gpusvm_notifier_lock(gpusvm);
- if (range->flags.unmapped) {
+ if (svm_pages->flags.unmapped) {
drm_gpusvm_notifier_unlock(gpusvm);
err = -EFAULT;
goto err_free;
@@ -1413,13 +1420,12 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
goto retry;
}
- if (!range->dma_addr) {
+ if (!svm_pages->dma_addr) {
/* Unlock and restart mapping to allocate memory. */
drm_gpusvm_notifier_unlock(gpusvm);
- range->dma_addr = kvmalloc_array(npages,
- sizeof(*range->dma_addr),
- GFP_KERNEL);
- if (!range->dma_addr) {
+ svm_pages->dma_addr =
+ kvmalloc_array(npages, sizeof(*svm_pages->dma_addr), GFP_KERNEL);
+ if (!svm_pages->dma_addr) {
err = -ENOMEM;
goto err_free;
}
@@ -1457,13 +1463,13 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
goto err_unmap;
}
}
- range->dma_addr[j] =
+ svm_pages->dma_addr[j] =
dpagemap->ops->device_map(dpagemap,
gpusvm->drm->dev,
page, order,
dma_dir);
if (dma_mapping_error(gpusvm->drm->dev,
- range->dma_addr[j].addr)) {
+ svm_pages->dma_addr[j].addr)) {
err = -EFAULT;
goto err_unmap;
}
@@ -1487,7 +1493,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
goto err_unmap;
}
- range->dma_addr[j] = drm_pagemap_device_addr_encode
+ svm_pages->dma_addr[j] = drm_pagemap_device_addr_encode
(addr, DRM_INTERCONNECT_SYSTEM, order,
dma_dir);
@@ -1503,10 +1509,10 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
num_dma_mapped = i;
}
- range->flags.has_dma_mapping = true;
+ svm_pages->flags.has_dma_mapping = true;
if (zdd) {
- range->flags.has_devmem_pages = true;
- range->dpagemap = dpagemap;
+ svm_pages->flags.has_devmem_pages = true;
+ svm_pages->dpagemap = dpagemap;
}
drm_gpusvm_notifier_unlock(gpusvm);
@@ -1517,7 +1523,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
return 0;
err_unmap:
- __drm_gpusvm_range_unmap_pages(gpusvm, range, num_dma_mapped);
+ __drm_gpusvm_unmap_pages(gpusvm, svm_pages, num_dma_mapped);
drm_gpusvm_notifier_unlock(gpusvm);
err_free:
kvfree(pfns);
@@ -1543,6 +1549,7 @@ void drm_gpusvm_range_unmap_pages(struct drm_gpusvm *gpusvm,
struct drm_gpusvm_range *range,
const struct drm_gpusvm_ctx *ctx)
{
+ struct drm_gpusvm_pages *svm_pages = &range->pages;
unsigned long npages = npages_in_range(drm_gpusvm_range_start(range),
drm_gpusvm_range_end(range));
@@ -1551,7 +1558,7 @@ void drm_gpusvm_range_unmap_pages(struct drm_gpusvm *gpusvm,
else
drm_gpusvm_notifier_lock(gpusvm);
- __drm_gpusvm_range_unmap_pages(gpusvm, range, npages);
+ __drm_gpusvm_unmap_pages(gpusvm, svm_pages, npages);
if (!ctx->in_notifier)
drm_gpusvm_notifier_unlock(gpusvm);
@@ -1719,7 +1726,7 @@ int drm_gpusvm_migrate_to_devmem(struct drm_gpusvm *gpusvm,
mmap_assert_locked(gpusvm->mm);
- if (!range->flags.migrate_devmem)
+ if (!range->pages.flags.migrate_devmem)
return -EINVAL;
if (!ops->populate_devmem_pfn || !ops->copy_to_devmem ||
@@ -2248,10 +2255,10 @@ void drm_gpusvm_range_set_unmapped(struct drm_gpusvm_range *range,
{
lockdep_assert_held_write(&range->gpusvm->notifier_lock);
- range->flags.unmapped = true;
+ range->pages.flags.unmapped = true;
if (drm_gpusvm_range_start(range) < mmu_range->start ||
drm_gpusvm_range_end(range) > mmu_range->end)
- range->flags.partial_unmap = true;
+ range->pages.flags.partial_unmap = true;
}
EXPORT_SYMBOL_GPL(drm_gpusvm_range_set_unmapped);
diff --git a/drivers/gpu/drm/xe/xe_pt.c b/drivers/gpu/drm/xe/xe_pt.c
index ffaf0d02dc7d..c43e7619cb80 100644
--- a/drivers/gpu/drm/xe/xe_pt.c
+++ b/drivers/gpu/drm/xe/xe_pt.c
@@ -659,7 +659,7 @@ xe_pt_stage_bind(struct xe_tile *tile, struct xe_vma *vma,
return -EAGAIN;
}
if (xe_svm_range_has_dma_mapping(range)) {
- xe_res_first_dma(range->base.dma_addr, 0,
+ xe_res_first_dma(range->base.pages.dma_addr, 0,
range->base.itree.last + 1 - range->base.itree.start,
&curs);
is_devmem = xe_res_is_vram(&curs);
diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index 08617a62ab07..4e7f2e77b38d 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -17,7 +17,7 @@
static bool xe_svm_range_in_vram(struct xe_svm_range *range)
{
/* Not reliable without notifier lock */
- return range->base.flags.has_devmem_pages;
+ return range->base.pages.flags.has_devmem_pages;
}
static bool xe_svm_range_has_vram_binding(struct xe_svm_range *range)
@@ -135,7 +135,7 @@ xe_svm_range_notifier_event_begin(struct xe_vm *vm, struct drm_gpusvm_range *r,
range_debug(range, "NOTIFIER");
/* Skip if already unmapped or if no binding exist */
- if (range->base.flags.unmapped || !range->tile_present)
+ if (range->base.pages.flags.unmapped || !range->tile_present)
return 0;
range_debug(range, "NOTIFIER - EXECUTE");
@@ -766,7 +766,7 @@ int xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma,
range_debug(range, "PAGE FAULT");
/* XXX: Add migration policy, for now migrate range once */
- if (!range->skip_migrate && range->base.flags.migrate_devmem &&
+ if (!range->skip_migrate && range->base.pages.flags.migrate_devmem &&
xe_svm_range_size(range) >= SZ_64K) {
range->skip_migrate = true;
diff --git a/drivers/gpu/drm/xe/xe_svm.h b/drivers/gpu/drm/xe/xe_svm.h
index 93442738666e..79fbd4fec1fb 100644
--- a/drivers/gpu/drm/xe/xe_svm.h
+++ b/drivers/gpu/drm/xe/xe_svm.h
@@ -136,7 +136,7 @@ void xe_svm_range_debug(struct xe_svm_range *range, const char *operation)
static inline bool xe_svm_range_has_dma_mapping(struct xe_svm_range *range)
{
lockdep_assert_held(&range->base.gpusvm->notifier_lock);
- return range->base.flags.has_dma_mapping;
+ return range->base.pages.flags.has_dma_mapping;
}
#define xe_svm_assert_in_notifier(vm__) \
diff --git a/include/drm/drm_gpusvm.h b/include/drm/drm_gpusvm.h
index df120b4d1f83..c15c733ef0ad 100644
--- a/include/drm/drm_gpusvm.h
+++ b/include/drm/drm_gpusvm.h
@@ -186,14 +186,8 @@ struct drm_gpusvm_notifier {
};
/**
- * struct drm_gpusvm_range - Structure representing a GPU SVM range
+ * struct drm_gpusvm_pages - Structure representing a GPU SVM mapped pages
*
- * @gpusvm: Pointer to the GPU SVM structure
- * @notifier: Pointer to the GPU SVM notifier
- * @refcount: Reference count for the range
- * @itree: Interval tree node for the range (inserted in GPU SVM notifier)
- * @entry: List entry to fast interval tree traversal
- * @notifier_seq: Notifier sequence number of the range's pages
* @dma_addr: Device address array
* @dpagemap: The struct drm_pagemap of the device pages we're dma-mapping.
* Note this is assuming only one drm_pagemap per range is allowed.
@@ -203,17 +197,8 @@ struct drm_gpusvm_notifier {
* @flags.partial_unmap: Flag indicating if the range has been partially unmapped
* @flags.has_devmem_pages: Flag indicating if the range has devmem pages
* @flags.has_dma_mapping: Flag indicating if the range has a DMA mapping
- *
- * This structure represents a GPU SVM range used for tracking memory ranges
- * mapped in a DRM device.
*/
-struct drm_gpusvm_range {
- struct drm_gpusvm *gpusvm;
- struct drm_gpusvm_notifier *notifier;
- struct kref refcount;
- struct interval_tree_node itree;
- struct list_head entry;
- unsigned long notifier_seq;
+struct drm_gpusvm_pages {
struct drm_pagemap_device_addr *dma_addr;
struct drm_pagemap *dpagemap;
struct {
@@ -227,6 +212,30 @@ struct drm_gpusvm_range {
} flags;
};
+/**
+ * struct drm_gpusvm_range - Structure representing a GPU SVM range
+ *
+ * @gpusvm: Pointer to the GPU SVM structure
+ * @notifier: Pointer to the GPU SVM notifier
+ * @refcount: Reference count for the range
+ * @itree: Interval tree node for the range (inserted in GPU SVM notifier)
+ * @entry: List entry to fast interval tree traversal
+ * @notifier_seq: Notifier sequence number of the range's pages
+ * @pages: The pages for this range.
+ *
+ * This structure represents a GPU SVM range used for tracking memory ranges
+ * mapped in a DRM device.
+ */
+struct drm_gpusvm_range {
+ struct drm_gpusvm *gpusvm;
+ struct drm_gpusvm_notifier *notifier;
+ struct kref refcount;
+ struct interval_tree_node itree;
+ struct list_head entry;
+ unsigned long notifier_seq;
+ struct drm_gpusvm_pages pages;
+};
+
/**
* struct drm_gpusvm - GPU SVM structure
*
--
2.48.1
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