add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/xen/gntdev-common.h
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@@ -15,21 +15,16 @@
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 #include <linux/mman.h>
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 #include <linux/mmu_notifier.h>
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 #include <linux/types.h>
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+#include <xen/interface/event_channel.h>
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+#include <xen/grant_table.h>
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 struct gntdev_dmabuf_priv;
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 struct gntdev_priv {
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 	/* Maps with visible offsets in the file descriptor. */
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 	struct list_head maps;
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-	/*
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-	 * Maps that are not visible; will be freed on munmap.
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-	 * Only populated if populate_freeable_maps == 1
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-	 */
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-	struct list_head freeable_maps;
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 	/* lock protects maps and freeable_maps. */
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 	struct mutex lock;
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-	struct mm_struct *mm;
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-	struct mmu_notifier mn;
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 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
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 	/* Device for which DMA memory is allocated. */
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@@ -45,12 +40,14 @@
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 	int flags;
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 	/* Address relative to the start of the gntdev_grant_map. */
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 	int addr;
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-	int event;
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+	evtchn_port_t event;
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 };
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 struct gntdev_grant_map {
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+	atomic_t in_use;
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+	struct mmu_interval_notifier notifier;
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+	bool notifier_init;
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 	struct list_head next;
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-	struct vm_area_struct *vma;
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 	int index;
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 	int count;
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 	int flags;
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@@ -61,6 +58,7 @@
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 	struct gnttab_unmap_grant_ref *unmap_ops;
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 	struct gnttab_map_grant_ref   *kmap_ops;
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 	struct gnttab_unmap_grant_ref *kunmap_ops;
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+	bool *being_removed;
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 	struct page **pages;
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 	unsigned long pages_vm_start;
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@@ -78,6 +76,11 @@
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 	/* Needed to avoid allocation in gnttab_dma_free_pages(). */
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 	xen_pfn_t *frames;
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 #endif
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+
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+	/* Number of live grants */
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+	atomic_t live_grants;
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+	/* Needed to avoid allocation in __unmap_grant_pages */
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+	struct gntab_unmap_queue_data unmap_data;
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 };
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 struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
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@@ -87,7 +90,7 @@
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 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
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-bool gntdev_account_mapped_pages(int count);
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+bool gntdev_test_page_count(unsigned int count);
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 int gntdev_map_grant_pages(struct gntdev_grant_map *map);
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