add ax88772C AX88772C_eeprom_tools

hc

2024-05-10 61598093bbdd283a7edc367d900f223070ead8d2

 kernel/drivers/gpu/drm/i915/i915_mm.c
..
..
@@ -25,7 +25,6 @@
25
25
 #include <linux/mm.h>
26
26
 #include <linux/io-mapping.h>
27
27
 
28
-#include <asm/pgtable.h>
29
28
 
30
29
 #include "i915_drv.h"
31
30
 
..
..
@@ -33,16 +32,47 @@
33
32
 	struct mm_struct *mm;
34
33
 	unsigned long pfn;
35
34
 	pgprot_t prot;
35
+
36
+	struct sgt_iter sgt;
37
+	resource_size_t iobase;
36
38
 };
37
39
 
38
-static int remap_pfn(pte_t *pte, pgtable_t token,
39
-		     unsigned long addr, void *data)
40
+static int remap_pfn(pte_t *pte, unsigned long addr, void *data)
40
41
 {
41
42
 	struct remap_pfn *r = data;
42
43
 
43
44
 	/* Special PTE are not associated with any struct page */
44
45
 	set_pte_at(r->mm, addr, pte, pte_mkspecial(pfn_pte(r->pfn, r->prot)));
45
46
 	r->pfn++;
47
+
48
+	return 0;
49
+}
50
+
51
+#define use_dma(io) ((io) != -1)
52
+
53
+static inline unsigned long sgt_pfn(const struct remap_pfn *r)
54
+{
55
+	if (use_dma(r->iobase))
56
+		return (r->sgt.dma + r->sgt.curr + r->iobase) >> PAGE_SHIFT;
57
+	else
58
+		return r->sgt.pfn + (r->sgt.curr >> PAGE_SHIFT);
59
+}
60
+
61
+static int remap_sg(pte_t *pte, unsigned long addr, void *data)
62
+{
63
+	struct remap_pfn *r = data;
64
+
65
+	if (GEM_WARN_ON(!r->sgt.pfn))
66
+		return -EINVAL;
67
+
68
+	/* Special PTE are not associated with any struct page */
69
+	set_pte_at(r->mm, addr, pte,
70
+		   pte_mkspecial(pfn_pte(sgt_pfn(r), r->prot)));
71
+	r->pfn++; /* track insertions in case we need to unwind later */
72
+
73
+	r->sgt.curr += PAGE_SIZE;
74
+	if (r->sgt.curr >= r->sgt.max)
75
+		r->sgt = __sgt_iter(__sg_next(r->sgt.sgp), use_dma(r->iobase));
46
76
 
47
77
 	return 0;
48
78
 }
..
..
@@ -64,9 +94,8 @@
64
94
 	struct remap_pfn r;
65
95
 	int err;
66
96
 
67
-	GEM_BUG_ON((vma->vm_flags &
68
-		    (VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP)) !=
69
-		   (VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP));
97
+#define EXPECTED_FLAGS (VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP)
98
+	GEM_BUG_ON((vma->vm_flags & EXPECTED_FLAGS) != EXPECTED_FLAGS);
70
99
 
71
100
 	/* We rely on prevalidation of the io-mapping to skip track_pfn(). */
72
101
 	r.mm = vma->vm_mm;
..
..
@@ -82,3 +111,40 @@
82
111
 
83
112
 	return 0;
84
113
 }
114
+
115
+/**
116
+ * remap_io_sg - remap an IO mapping to userspace
117
+ * @vma: user vma to map to
118
+ * @addr: target user address to start at
119
+ * @size: size of map area
120
+ * @sgl: Start sg entry
121
+ * @iobase: Use stored dma address offset by this address or pfn if -1
122
+ *
123
+ *  Note: this is only safe if the mm semaphore is held when called.
124
+ */
125
+int remap_io_sg(struct vm_area_struct *vma,
126
+		unsigned long addr, unsigned long size,
127
+		struct scatterlist *sgl, resource_size_t iobase)
128
+{
129
+	struct remap_pfn r = {
130
+		.mm = vma->vm_mm,
131
+		.prot = vma->vm_page_prot,
132
+		.sgt = __sgt_iter(sgl, use_dma(iobase)),
133
+		.iobase = iobase,
134
+	};
135
+	int err;
136
+
137
+	/* We rely on prevalidation of the io-mapping to skip track_pfn(). */
138
+	GEM_BUG_ON((vma->vm_flags & EXPECTED_FLAGS) != EXPECTED_FLAGS);
139
+
140
+	if (!use_dma(iobase))
141
+		flush_cache_range(vma, addr, size);
142
+
143
+	err = apply_to_page_range(r.mm, addr, size, remap_sg, &r);
144
+	if (unlikely(err)) {
145
+		zap_vma_ptes(vma, addr, r.pfn << PAGE_SHIFT);
146
+		return err;
147
+	}
148
+
149
+	return 0;
150
+}