resource
kernel/resource.c
TODO
- plka 内容回顾一下
- https://0xax.gitbooks.io/linux-insides/content/MM/linux-mm-2.html 似乎提供了关键内容啊!
question
- 动态规划的还是实现定义的
- 或者那些内容可以变化，那些需要实现定义一下
- 写入的地址是物理地址吗 ?
- 这些地址又什么特殊之处吗 ?
- 利用 allocate_resource ?
proc
- /proc/ioports 和 /proc/iomem
static int __init ioresources_init(void)
{
proc_create_seq_data("ioports", 0, NULL, &resource_op,
&ioport_resource);
proc_create_seq_data("iomem", 0, NULL, &resource_op, &iomem_resource);
return 0;
}
struct resource ioport_resource = {
.name = "PCI IO",
.start = 0,
.end = IO_SPACE_LIMIT,
.flags = IORESOURCE_IO,
};
EXPORT_SYMBOL(ioport_resource);
struct resource iomem_resource = {
.name = "PCI mem",
.start = 0,
.end = -1,
.flags = IORESOURCE_MEM,
};
EXPORT_SYMBOL(iomem_resource);
// todo 跟踪一下两个位置的初始化位置
static const struct seq_operations resource_op = {
.start = r_start,
.next = r_next,
.stop = r_stop,
.show = r_show,
};
- proc 操作上，并没有什么神奇的地方，构成树形的结构，将树形的结构打印出来即可。
API : request_resource && release_resource
/**
* request_resource - request and reserve an I/O or memory resource
* @root: root resource descriptor
* @new: resource descriptor desired by caller
*
* Returns 0 for success, negative error code on error.
*/
int request_resource(struct resource *root, struct resource *new)
{
struct resource *conflict;
conflict = request_resource_conflict(root, new);
return conflict ? -EBUSY : 0;
}
/**
* release_resource - release a previously reserved resource
* @old: resource pointer
*/
int release_resource(struct resource *old)
{
int retval;
write_lock(&resource_lock);
retval = __release_resource(old, true);
write_unlock(&resource_lock);
return retval;
}
/**
* request_resource_conflict - request and reserve an I/O or memory resource
* @root: root resource descriptor
* @new: resource descriptor desired by caller
*
* Returns 0 for success, conflict resource on error.
*/
struct resource *request_resource_conflict(struct resource *root, struct resource *new)
{
struct resource *conflict;
write_lock(&resource_lock);
conflict = __request_resource(root, new);
write_unlock(&resource_lock);
return conflict;
}
/* Return the conflict entry if you can't request it */
static struct resource * __request_resource(struct resource *root, struct resource *new)
{
resource_size_t start = new->start;
resource_size_t end = new->end;
struct resource *tmp, **p;
if (end < start)
return root;
if (start < root->start)
return root;
if (end > root->end)
return root;
p = &root->child;
for (;;) {
tmp = *p;
if (!tmp || tmp->start > end) {
new->sibling = tmp;
*p = new;
new->parent = root;
return NULL;
}
p = &tmp->sibling;
if (tmp->end < start)
continue;
return tmp;
}
}
devm
需要调用一些 : drivers/base/driver.c
如何准确的获取 kernel 中 RAM 的空间
/proc/iomem demicode
最好是，将 NUMA 的 boundary 找出来
ARM 虚拟机中的内容:
😀 sudo cat /proc/iomem
00000000-03ffffff : LNRO0015:00
04000000-07ffffff : LNRO0015:01
09000000-09000fff : ARMH0011:00
09000000-09000fff : ARMH0011:00 ARMH0011:00
09020000-09020017 : QEMU0002:00
09020000-09020017 : fw_cfg_mem
09030000-09030fff : ARMH0061:00
09030000-09030fff : ARMH0061:00 ARMH0061:00
0a000000-0a0001ff : LNRO0005:00
0a000200-0a0003ff : LNRO0005:01
0a000400-0a0005ff : LNRO0005:02
0a000600-0a0007ff : LNRO0005:03
0a000800-0a0009ff : LNRO0005:04
0a000a00-0a000bff : LNRO0005:05
0a000c00-0a000dff : LNRO0005:06
0a000e00-0a000fff : LNRO0005:07
0a001000-0a0011ff : LNRO0005:08
0a001200-0a0013ff : LNRO0005:09
0a001400-0a0015ff : LNRO0005:0a
0a001600-0a0017ff : LNRO0005:0b
0a001800-0a0019ff : LNRO0005:0c
0a001a00-0a001bff : LNRO0005:0d
0a001c00-0a001dff : LNRO0005:0e
0a001e00-0a001fff : LNRO0005:0f
0a002000-0a0021ff : LNRO0005:10
0a002200-0a0023ff : LNRO0005:11
0a002400-0a0025ff : LNRO0005:12
0a002600-0a0027ff : LNRO0005:13
0a002800-0a0029ff : LNRO0005:14
0a002a00-0a002bff : LNRO0005:15
0a002c00-0a002dff : LNRO0005:16
0a002e00-0a002fff : LNRO0005:17
0a003000-0a0031ff : LNRO0005:18
0a003200-0a0033ff : LNRO0005:19
0a003400-0a0035ff : LNRO0005:1a
0a003600-0a0037ff : LNRO0005:1b
0a003800-0a0039ff : LNRO0005:1c
0a003a00-0a003bff : LNRO0005:1d
0a003c00-0a003dff : LNRO0005:1e
0a003e00-0a003fff : LNRO0005:1f
10000000-3efeffff : PCI Bus 0000:00
10000000-101fffff : PCI Bus 0000:01
10000000-10000fff : 0000:01:00.0
10200000-103fffff : PCI Bus 0000:02
10200000-10200fff : 0000:02:00.0
10400000-105fffff : PCI Bus 0000:03
10400000-10403fff : 0000:03:00.0
10400000-10403fff : xhci-hcd
10600000-107fffff : PCI Bus 0000:04
10600000-10600fff : 0000:04:00.0
10800000-109fffff : PCI Bus 0000:05
10800000-10800fff : 0000:05:00.0
10a00000-10bfffff : PCI Bus 0000:06
10c00000-10dfffff : PCI Bus 0000:07
10c00000-10c00fff : 0000:07:00.0
10e00000-10ffffff : PCI Bus 0000:08
11000000-111fffff : PCI Bus 0000:09
11200000-113fffff : PCI Bus 0000:0a
11400000-115fffff : PCI Bus 0000:0b
11600000-117fffff : PCI Bus 0000:0c
11800000-119fffff : PCI Bus 0000:0d
11a00000-11bfffff : PCI Bus 0000:0e
11c00000-11dfffff : PCI Bus 0000:0f
11e00000-11e00fff : 0000:00:01.0
11e01000-11e01fff : 0000:00:01.1
11e02000-11e02fff : 0000:00:01.2
11e03000-11e03fff : 0000:00:01.3
11e04000-11e04fff : 0000:00:01.4
11e05000-11e05fff : 0000:00:01.5
11e06000-11e06fff : 0000:00:01.6
11e07000-11e07fff : 0000:00:01.7
11e08000-11e08fff : 0000:00:02.0
11e09000-11e09fff : 0000:00:02.1
11e0a000-11e0afff : 0000:00:02.2
11e0b000-11e0bfff : 0000:00:02.3
11e0c000-11e0cfff : 0000:00:02.4
11e0d000-11e0dfff : 0000:00:02.5
11e0e000-11e0efff : 0000:00:02.6
3f000000-3fffffff : PCI ECAM
40000000-83c12ffff : System RAM
fa000000-ffffffff : reserved
100231000-100231fff : reserved
100270000-10027ffff : reserved
100280000-10028ffff : reserved
100290000-10029ffff : reserved
1002a0000-1002affff : reserved
1002b0000-1002bffff : reserved
1002c0000-1002cffff : reserved
1002d0000-1002dffff : reserved
1002e0000-1002effff : reserved
1002f0000-1002fffff : reserved
100300000-10030ffff : reserved
100310000-10031ffff : reserved
100320000-10032ffff : reserved
100330000-10033ffff : reserved
100340000-10034ffff : reserved
100350000-10035ffff : reserved
100360000-10036ffff : reserved
100370000-10037ffff : reserved
100380000-10038ffff : reserved
100390000-10039ffff : reserved
1003a0000-1003affff : reserved
1003b0000-1003bffff : reserved
1003c0000-1003cffff : reserved
1003d0000-1003dffff : reserved
1003e0000-1003effff : reserved
1003f0000-1003fffff : reserved
100400000-10040ffff : reserved
100410000-10041ffff : reserved
100420000-10042ffff : reserved
100430000-10043ffff : reserved
100440000-10044ffff : reserved
100450000-10045ffff : reserved
100460000-10046ffff : reserved
100470000-10047ffff : reserved
7cbc50000-7cbc50fff : reserved
7cbe70000-7cdceffff : Kernel code
7cdcf0000-7ce63ffff : reserved
7ce640000-7cebeffff : Kernel data
7cebf1000-7d4f3efff : reserved
818580000-83b9fffff : reserved
83ba36000-83ba37fff : reserved
83ba38000-83c12ffff : reserved
83c130000-83c44ffff : reserved
83c450000-83f72ffff : System RAM
83c450000-83c450fff : reserved
83c451000-83c451fff : reserved
83c452000-83e740fff : reserved
83e741000-83e741fff : reserved
83e742000-83e742fff : reserved
83e743000-83f72ffff : reserved
83f730000-83f7bffff : reserved
83f7c0000-83f7cffff : System RAM
83f7c0000-83f7cffff : reserved
83f7d0000-83f8effff : reserved
83f8f0000-83fffffff : System RAM
83f8f0000-83fffffff : reserved
8000000000-ffffffffff : PCI Bus 0000:00
8000000000-80001fffff : PCI Bus 0000:01
8000000000-8000003fff : 0000:01:00.0
8000000000-8000003fff : virtio-pci-modern
8000200000-80003fffff : PCI Bus 0000:02
8000200000-8000203fff : 0000:02:00.0
8000200000-8000203fff : virtio-pci-modern
8000400000-80005fffff : PCI Bus 0000:03
8000600000-80007fffff : PCI Bus 0000:04
8000600000-8000603fff : 0000:04:00.0
8000600000-8000603fff : virtio-pci-modern
8000800000-80009fffff : PCI Bus 0000:05
8000800000-8000803fff : 0000:05:00.0
8000800000-8000803fff : virtio-pci-modern
8000a00000-8000bfffff : PCI Bus 0000:06
8000a00000-8000a03fff : 0000:06:00.0
8000a00000-8000a03fff : virtio-pci-modern
8000c00000-8000dfffff : PCI Bus 0000:07
8000c00000-8000c03fff : 0000:07:00.0
8000c00000-8000c03fff : virtio-pci-modern
8000e00000-8000ffffff : PCI Bus 0000:08
8001000000-80011fffff : PCI Bus 0000:09
8001200000-80013fffff : PCI Bus 0000:0a
8001400000-80015fffff : PCI Bus 0000:0b
8001600000-80017fffff : PCI Bus 0000:0c
8001800000-80019fffff : PCI Bus 0000:0d
8001a00000-8001bfffff : PCI Bus 0000:0e
8001c00000-8001dfffff : PCI Bus 0000:0f
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