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powerpc/pseries: Make the acquire/release of the drc for memory a seperate step 

When adding and removing LMBs we should make the acquire/release of
the DRC a separate step to allow for a few improvements. First
this will ensure that LMBs removed during a remove by count operation
are all available if a error occurs and we need to add them back. By
first removeing all the LMBs from the kernel before releasing their
DRCs the LMBs are available to add back should an error occur.

Also, this will allow for faster re-add operations of memory for
PRRN event handling since we can skip the unneeded step of having
to release the DRC and the acquire it back.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: John Allen <jallen@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
John Allen 2017-01-06 13:25:53 -06:00 committed by Michael Ellerman
parent e71ff89c71
commit c21f515c74
1 changed files with 22 additions and 12 deletions
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34
arch/powerpc/platforms/pseries/hotplug-memory.c
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@ -446,9 +446,7 @@ static int dlpar_remove_lmb(struct of_drconf_cell *lmb)
/* Update memory regions for memory remove */
memblock_remove(lmb->base_addr, block_sz);
dlpar_release_drc(lmb->drc_index);
dlpar_remove_device_tree_lmb(lmb);
return 0;
}
@ -516,6 +514,7 @@ static int dlpar_memory_remove_by_count(u32 lmbs_to_remove,
if (!lmbs[i].reserved)
continue;
dlpar_release_drc(lmbs[i].drc_index);
pr_info("Memory at %llx was hot-removed\n",
lmbs[i].base_addr);
@ -545,6 +544,9 @@ static int dlpar_memory_remove_by_index(u32 drc_index, struct property *prop)
if (lmbs[i].drc_index == drc_index) {
lmb_found = 1;
rc = dlpar_remove_lmb(&lmbs[i]);
if (!rc)
dlpar_release_drc(lmbs[i].drc_index);
break;
}
}
@ -599,10 +601,6 @@ static int dlpar_add_lmb(struct of_drconf_cell *lmb)
if (lmb->flags & DRCONF_MEM_ASSIGNED)
return -EINVAL;
rc = dlpar_acquire_drc(lmb->drc_index);
if (rc)
return rc;
rc = dlpar_add_device_tree_lmb(lmb);
if (rc) {
pr_err("Couldn't update device tree for drc index %x\n",
@ -618,12 +616,10 @@ static int dlpar_add_lmb(struct of_drconf_cell *lmb)
/* Add the memory */
rc = add_memory(nid, lmb->base_addr, block_sz);
if (rc) {
if (rc)
dlpar_remove_device_tree_lmb(lmb);
dlpar_release_drc(lmb->drc_index);
} else {
else
lmb->flags |= DRCONF_MEM_ASSIGNED;
}
return rc;
}
@ -655,10 +651,16 @@ static int dlpar_memory_add_by_count(u32 lmbs_to_add, struct property *prop)
return -EINVAL;
for (i = 0; i < num_lmbs && lmbs_to_add != lmbs_added; i++) {
rc = dlpar_add_lmb(&lmbs[i]);
rc = dlpar_acquire_drc(lmbs[i].drc_index);
if (rc)
continue;
rc = dlpar_add_lmb(&lmbs[i]);
if (rc) {
dlpar_release_drc(lmbs[i].drc_index);
continue;
}
lmbs_added++;
/* Mark this lmb so we can remove it later if all of the
@ -678,6 +680,8 @@ static int dlpar_memory_add_by_count(u32 lmbs_to_add, struct property *prop)
if (rc)
pr_err("Failed to remove LMB, drc index %x\n",
be32_to_cpu(lmbs[i].drc_index));
else
dlpar_release_drc(lmbs[i].drc_index);
}
rc = -EINVAL;
} else {
@ -711,7 +715,13 @@ static int dlpar_memory_add_by_index(u32 drc_index, struct property *prop)
for (i = 0; i < num_lmbs; i++) {
if (lmbs[i].drc_index == drc_index) {
lmb_found = 1;
rc = dlpar_add_lmb(&lmbs[i]);
rc = dlpar_acquire_drc(lmbs[i].drc_index);
if (!rc) {
rc = dlpar_add_lmb(&lmbs[i]);
if (rc)
dlpar_release_drc(lmbs[i].drc_index);
}
break;
}
}