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zorro: Do not allocate zorro_autocon[] statically

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Currently the array of Zorro devices is allocated statically, wasting
up to 4.5 KiB when running an Amiga or multi-platform kernel on a machine
with no or a handful of Zorro expansion cards. Convert it to conditional
dynamic memory allocation to fix this.

amiga_parse_bootinfo() still needs to store some information about the
detected Zorro devices, at a time even the bootmem allocator is not yet
available.  This is now handled using a much smaller array (typically less
than 0.5 KiB), which is __initdata and thus freed later.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Geert Uytterhoeven 2013-06-29 10:40:20 +02:00
parent 1ea636eb68
commit c293738e6d
4 changed files with 38 additions and 9 deletions
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6
arch/m68k/amiga/config.c
View File

@ -174,12 +174,12 @@ int __init amiga_parse_bootinfo(const struct bi_record *record)
#ifdef CONFIG_ZORRO
if (zorro_num_autocon < ZORRO_NUM_AUTO) {
const struct ConfigDev *cd = (struct ConfigDev *)data;
struct zorro_dev *dev = &zorro_autocon[zorro_num_autocon++];
struct zorro_dev_init *dev = &zorro_autocon_init[zorro_num_autocon++];
dev->rom = cd->cd_Rom;
dev->slotaddr = cd->cd_SlotAddr;
dev->slotsize = cd->cd_SlotSize;
dev->resource.start = (unsigned long)cd->cd_BoardAddr;
dev->resource.end = dev->resource.start + cd->cd_BoardSize - 1;
dev->boardaddr = (u32)cd->cd_BoardAddr;
dev->boardsize = cd->cd_BoardSize;
} else
printk("amiga_parse_bootinfo: too many AutoConfig devices\n");
#endif /* CONFIG_ZORRO */

4
arch/m68k/amiga/platform.c
View File

@ -67,8 +67,8 @@ static int __init z_dev_present(zorro_id id)
unsigned int i;
for (i = 0; i < zorro_num_autocon; i++)
if (zorro_autocon[i].rom.er_Manufacturer == ZORRO_MANUF(id) &&
zorro_autocon[i].rom.er_Product == ZORRO_PROD(id))
if (zorro_autocon_init[i].rom.er_Manufacturer == ZORRO_MANUF(id) &&
zorro_autocon_init[i].rom.er_Product == ZORRO_PROD(id))
return 1;
return 0;

19
drivers/zorro/zorro.c
View File

@ -29,7 +29,8 @@
*/
unsigned int zorro_num_autocon;
struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;
struct zorro_dev *zorro_autocon;
/*
@ -38,6 +39,7 @@ struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
struct zorro_bus {
struct device dev;
struct zorro_dev devices[0];
};
@ -125,16 +127,20 @@ static struct resource __init *zorro_find_parent_resource(
static int __init amiga_zorro_probe(struct platform_device *pdev)
{
struct zorro_bus *bus;
struct zorro_dev_init *zi;
struct zorro_dev *z;
struct resource *r;
unsigned int i;
int error;
/* Initialize the Zorro bus */
bus = kzalloc(sizeof(*bus), GFP_KERNEL);
bus = kzalloc(sizeof(*bus) +
zorro_num_autocon * sizeof(bus->devices[0]),
GFP_KERNEL);
if (!bus)
return -ENOMEM;
zorro_autocon = bus->devices;
bus->dev.parent = &pdev->dev;
dev_set_name(&bus->dev, "zorro");
error = device_register(&bus->dev);
@ -151,15 +157,22 @@ static int __init amiga_zorro_probe(struct platform_device *pdev)
/* First identify all devices ... */
for (i = 0; i < zorro_num_autocon; i++) {
zi = &zorro_autocon_init[i];
z = &zorro_autocon[i];
z->rom = zi->rom;
z->id = (z->rom.er_Manufacturer<<16) | (z->rom.er_Product<<8);
if (z->id == ZORRO_PROD_GVP_EPC_BASE) {
/* GVP quirk */
unsigned long magic = zorro_resource_start(z)+0x8000;
unsigned long magic = zi->boardaddr + 0x8000;
z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
}
z->slotaddr = zi->slotaddr;
z->slotsize = zi->slotsize;
sprintf(z->name, "Zorro device %08x", z->id);
zorro_name_device(z);
z->resource.start = zi->boardaddr;
z->resource.end = zi->boardaddr + zi->boardsize - 1;
z->resource.name = z->name;
r = zorro_find_parent_resource(pdev, z);
error = request_resource(r, &z->resource);

18
include/linux/zorro.h
View File

@ -175,7 +175,23 @@ static inline struct zorro_driver *zorro_dev_driver(const struct zorro_dev *z)
extern unsigned int zorro_num_autocon; /* # of autoconfig devices found */
extern struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
extern struct zorro_dev *zorro_autocon;
/*
* Minimal information about a Zorro device, passed from bootinfo
* Only available temporarily, i.e. until initmem has been freed!
*/
struct zorro_dev_init {
struct ExpansionRom rom;
u16 slotaddr;
u16 slotsize;
u32 boardaddr;
u32 boardsize;
};
extern struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;
/*