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powerpc/pseries: Flush lazy kernel mappings after unplug operations

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This ensures that the translations for unmapped IO mappings or
unmapped memory are properly removed from the MMU hash table
before such an unplug. Without this, the hypervisor refuses the
unplug operations due to those resources still being mapped by
the partition.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2010-04-06 15:03:40 +00:00
parent 4b83c330b4
commit b4a26be9f6
3 changed files with 13 additions and 0 deletions
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7
arch/powerpc/platforms/pseries/hotplug-memory.c
View File

@ -11,6 +11,7 @@
#include <linux/of.h>
#include <linux/lmb.h>
#include <linux/vmalloc.h>
#include <asm/firmware.h>
#include <asm/machdep.h>
#include <asm/pSeries_reconfig.h>
@ -54,6 +55,12 @@ static int pseries_remove_lmb(unsigned long base, unsigned int lmb_size)
*/
start = (unsigned long)__va(base);
ret = remove_section_mapping(start, start + lmb_size);
/* Ensure all vmalloc mappings are flushed in case they also
* hit that section of memory
*/
vm_unmap_aliases();
return ret;
}

3
drivers/pci/hotplug/rpadlpar_core.c
View File

@ -20,6 +20,7 @@
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <asm/pci-bridge.h>
#include <linux/mutex.h>
@ -430,6 +431,8 @@ int dlpar_remove_slot(char *drc_name)
rc = dlpar_remove_pci_slot(drc_name, dn);
break;
}
vm_unmap_aliases();
printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
exit:
mutex_unlock(&rpadlpar_mutex);

3
drivers/pci/hotplug/rpaphp_core.c
View File

@ -29,6 +29,7 @@
#include <linux/pci_hotplug.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <asm/eeh.h> /* for eeh_add_device() */
#include <asm/rtas.h> /* rtas_call */
#include <asm/pci-bridge.h> /* for pci_controller */
@ -418,6 +419,8 @@ static int disable_slot(struct hotplug_slot *hotplug_slot)
return -EINVAL;
pcibios_remove_pci_devices(slot->bus);
vm_unmap_aliases();
slot->state = NOT_CONFIGURED;
return 0;
}