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[PPC64] Fix ofw_initrd

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Before this change, OFW initrd (as md) handling code was simulating an ofwbus
device. But as there isn't really a Device Tree (DT) node representing OFW
initrd (it is specified in 2 properties under /chosen), its driver was in fact
stealing other driver's DT node.  This was noticed after MD_ROOT_MEM became
default and QEMU's USB keyboard stopped working under VNC.

This change consists in simplifying the process of detection and mapping of
initrd memory, turning it into a simple startup step, instead of trying to
simulate a device.

Reviewed by:	jhibbits
Differential Revision:	https://reviews.freebsd.org/D20553
This commit is contained in:
Leandro Lupori 2019-06-11 11:16:41 +00:00
parent 8a250c7568
commit 5d8c3a0657
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=348899
1 changed files with 20 additions and 79 deletions
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99
sys/powerpc/ofw/ofw_initrd.c
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@ -43,62 +43,32 @@ __FBSDID("$FreeBSD$");
#include "opt_md.h"
#ifdef MD_ROOT_MEM
extern u_char *mfs_root;
extern uint32_t mfs_root_size;
#else
#warning "MD_ROOT_MEM should be set to use ofw initrd as a md device"
#endif
extern int mfs_root_size;
/* bus entry points */
static int ofw_initrd_probe(device_t dev);
static int ofw_initrd_attach(device_t dev);
static void ofw_initrd_identify(driver_t *driver, device_t parent);
static void ofw_initrd_probe_and_attach(void *junk);
struct ofw_initrd_softc {
device_t sc_dev;
vm_paddr_t start;
vm_paddr_t end;
};
SYSINIT(ofw_initrd_probe_and_attach, SI_SUB_KMEM, SI_ORDER_ANY,
ofw_initrd_probe_and_attach, NULL);
static int
ofw_initrd_probe(device_t dev)
static void
ofw_initrd_probe_and_attach(void *junk)
{
phandle_t chosen;
/* limit this device to one unit */
if (device_get_unit(dev) != 0)
return (ENXIO);
chosen = OF_finddevice("/chosen");
if (chosen <= 0) {
return (ENXIO);
}
if (!OF_hasprop(chosen, "linux,initrd-start") ||
!OF_hasprop(chosen, "linux,initrd-end"))
return (ENXIO);
device_set_desc(dev, "OFW initrd memregion loader");
return (BUS_PROBE_DEFAULT);
}
static int
ofw_initrd_attach(device_t dev)
{
struct ofw_initrd_softc *sc;
vm_paddr_t start, end;
phandle_t chosen;
pcell_t cell[2];
ssize_t size;
sc = device_get_softc(dev);
if (!hw_direct_map)
return;
chosen = OF_finddevice("/chosen");
if (chosen <= 0) {
device_printf(dev, "/chosen not found\n");
return (ENXIO);
}
if (chosen <= 0)
return;
if (!OF_hasprop(chosen, "linux,initrd-start") ||
!OF_hasprop(chosen, "linux,initrd-end"))
return;
size = OF_getencprop(chosen, "linux,initrd-start", cell, sizeof(cell));
if (size == 4)
@ -106,8 +76,8 @@ ofw_initrd_attach(device_t dev)
else if (size == 8)
start = (uint64_t)cell[0] << 32 | cell[1];
else {
device_printf(dev, "Wrong linux,initrd-start size\n");
return (ENXIO);
printf("ofw_initrd: Wrong linux,initrd-start size\n");
return;
}
size = OF_getencprop(chosen, "linux,initrd-end", cell, sizeof(cell));
@ -116,44 +86,15 @@ ofw_initrd_attach(device_t dev)
else if (size == 8)
end = (uint64_t)cell[0] << 32 | cell[1];
else{
device_printf(dev, "Wrong linux,initrd-end size\n");
return (ENXIO);
printf("ofw_initrd: Wrong linux,initrd-end size\n");
return;
}
if (end - start > 0) {
mfs_root = (u_char *) PHYS_TO_DMAP(start);
mfs_root_size = end - start;
return (0);
printf("ofw_initrd: initrd loaded at 0x%08lx-0x%08lx\n",
start, end);
}
return (ENXIO);
}
static void
ofw_initrd_identify(driver_t *driver, device_t parent)
{
if (device_find_child(parent, "initrd", -1) != NULL)
return;
if (BUS_ADD_CHILD(parent, 10, "initrd", -1) == NULL)
device_printf(parent, "add ofw_initrd child failed\n");
}
static device_method_t ofw_initrd_methods[] = {
DEVMETHOD(device_identify, ofw_initrd_identify),
DEVMETHOD(device_probe, ofw_initrd_probe),
DEVMETHOD(device_attach, ofw_initrd_attach),
DEVMETHOD_END
};
static driver_t ofw_initrd_driver = {
"ofw_initrd",
ofw_initrd_methods,
sizeof(struct ofw_initrd_softc)
};
static devclass_t ofw_initrd_devclass;
DRIVER_MODULE(ofw_initrd, ofwbus, ofw_initrd_driver, ofw_initrd_devclass,
NULL, NULL);