On 05/21/2018 12:52 PM, Michael Bringmann wrote:
> migration/memory: This patch adds more recognition for changes to
> the associativity of memory blocks described by the device-tree
> properties and updates local and general kernel data structures to
> reflect those changes. These differences may include:
>
> * Evaluating 'ibm,dynamic-memory' properties when processing the
> topology of LPARS in Post Migration events. Previous efforts
> only recognized whether a memory block's assignment had changed
> in the property. Changes here include checking the aa_index
> values for each drc_index of the old/new LMBs and to 'readd'
> any block for which the setting has changed.
>
> * In an LPAR migration scenario, the "ibm,associativity-lookup-arrays"
> property may change. In the event that a row of the array differs,
> locate all assigned memory blocks with that 'aa_index' and 're-add'
> them to the system memory block data structures. In the process of
> the 're-add', the system routines will update the corresponding entry
> for the memory in the LMB structures and any other relevant kernel
> data structures.
>
> * Extend the previous work for the 'ibm,associativity-lookup-array'
> and 'ibm,dynamic-memory' properties to support the property
> 'ibm,dynamic-memory-v2' by means of the DRMEM LMB interpretation
> code.
>
> Signed-off-by: Michael Bringmann <m...@linux.vnet.ibm.com>
> ---
> Changes in RFC:
> -- Simplify code to update memory nodes during mobility checks.
> -- Reuse code from DRMEM changes to scan for LMBs when updating
> aa_index
> -- Combine common code for properties 'ibm,dynamic-memory' and
> 'ibm,dynamic-memory-v2' after integrating DRMEM features.
> -- Rearrange patches to co-locate memory property-related changes.
> -- Use new paired list iterator for the drmem info arrays.
> -- Use direct calls to add/remove memory from the update drconf
> function as those operations are only intended for user DLPAR
> ops, and should not occur during Migration reconfig notifier
> changes.
> -- Correct processing bug in processing of ibm,associativity-lookup-arrays
> -- Rebase to 4.17-rc5 kernel
> -- Apply minor code cleanups
> ---
> arch/powerpc/platforms/pseries/hotplug-memory.c | 153
> ++++++++++++++++++-----
> 1 file changed, 121 insertions(+), 32 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c
> b/arch/powerpc/platforms/pseries/hotplug-memory.c
> index c1578f5..ac329aa 100644
> --- a/arch/powerpc/platforms/pseries/hotplug-memory.c
> +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
> @@ -994,13 +994,11 @@ static int pseries_add_mem_node(struct device_node *np)
> return (ret < 0) ? -EINVAL : 0;
> }
>
> -static int pseries_update_drconf_memory(struct of_reconfig_data *pr)
> +static int pseries_update_drconf_memory(struct drmem_lmb_info *new_dinfo)
> {
> - struct of_drconf_cell_v1 *new_drmem, *old_drmem;
> + struct drmem_lmb *old_lmb, *new_lmb;
> unsigned long memblock_size;
> - u32 entries;
> - __be32 *p;
> - int i, rc = -EINVAL;
> + int rc = 0;
>
> if (rtas_hp_event)
> return 0;
> @@ -1009,42 +1007,124 @@ static int pseries_update_drconf_memory(struct
> of_reconfig_data *pr)
> if (!memblock_size)
> return -EINVAL;
>
> - p = (__be32 *) pr->old_prop->value;
> - if (!p)
> - return -EINVAL;
> + /* Arrays should have the same size and DRC indexes */
> + for_each_pair_drmem_lmb(drmem_info, old_lmb, new_dinfo, new_lmb) {
>
> - /* The first int of the property is the number of lmb's described
> - * by the property. This is followed by an array of of_drconf_cell
> - * entries. Get the number of entries and skip to the array of
> - * of_drconf_cell's.
> - */
> - entries = be32_to_cpu(*p++);
> - old_drmem = (struct of_drconf_cell_v1 *)p;
> -
> - p = (__be32 *)pr->prop->value;
> - p++;
> - new_drmem = (struct of_drconf_cell_v1 *)p;
> + if (new_lmb->drc_index != old_lmb->drc_index)
> + continue;
>
> - for (i = 0; i < entries; i++) {
> - if ((be32_to_cpu(old_drmem[i].flags) & DRCONF_MEM_ASSIGNED) &&
> - (!(be32_to_cpu(new_drmem[i].flags) & DRCONF_MEM_ASSIGNED)))
> {
> + if ((old_lmb->flags & DRCONF_MEM_ASSIGNED) &&
> + (!(new_lmb->flags & DRCONF_MEM_ASSIGNED))) {
> rc = pseries_remove_memblock(
> - be64_to_cpu(old_drmem[i].base_addr),
> - memblock_size);
> + old_lmb->base_addr, memblock_size);
> break;
> - } else if ((!(be32_to_cpu(old_drmem[i].flags) &
> - DRCONF_MEM_ASSIGNED)) &&
> - (be32_to_cpu(new_drmem[i].flags) &
> - DRCONF_MEM_ASSIGNED)) {
> - rc = memblock_add(be64_to_cpu(old_drmem[i].base_addr),
> - memblock_size);
> + } else if ((!(old_lmb->flags & DRCONF_MEM_ASSIGNED)) &&
> + (new_lmb->flags & DRCONF_MEM_ASSIGNED)) {
> + rc = memblock_add(old_lmb->base_addr,
> + memblock_size);
> rc = (rc < 0) ? -EINVAL : 0;
> break;
> + } else if ((old_lmb->aa_index != new_lmb->aa_index) &&
> + (new_lmb->flags & DRCONF_MEM_ASSIGNED)) {
> + dlpar_queue_action(PSERIES_HP_ELOG_RESOURCE_MEM,
> + PSERIES_HP_ELOG_ACTION_READD,
> + new_lmb->drc_index);
> }
> }
> return rc;
> }
>
> +static void pseries_update_ala_memory_aai(int aa_index)
> +{
> + struct drmem_lmb *lmb;
> +
> + /* Readd all LMBs which were previously using the
> + * specified aa_index value.
> + */
> + for_each_drmem_lmb(lmb) {
> + if ((lmb->aa_index == aa_index) &&
> + (lmb->flags & DRCONF_MEM_ASSIGNED)) {
> + dlpar_queue_action(PSERIES_HP_ELOG_RESOURCE_MEM,
> + PSERIES_HP_ELOG_ACTION_READD,
> + lmb->drc_index);
> + }
> + }
> +}
> +
> +struct assoc_arrays {
> + u32 n_arrays;
> + u32 array_sz;
> + const __be32 *arrays;
> +};
> +
> +static int pseries_update_ala_memory(struct of_reconfig_data *pr)
> +{
> + struct assoc_arrays new_ala, old_ala;
> + __be32 *p;
> + int i, lim;
> +
> + if (rtas_hp_event)
> + return 0;
> +
> + /*
> + * The layout of the ibm,associativity-lookup-arrays
> + * property is a number N indicating the number of
> + * associativity arrays, followed by a number M
> + * indicating the size of each associativity array,
> + * followed by a list of N associativity arrays.
> + */
> +
> + p = (__be32 *) pr->old_prop->value;
> + if (!p)
> + return -EINVAL;
> + old_ala.n_arrays = of_read_number(p++, 1);
> + old_ala.array_sz = of_read_number(p++, 1);
> + old_ala.arrays = p;
> +
> + p = (__be32 *) pr->prop->value;
> + if (!p)
> + return -EINVAL;
> + new_ala.n_arrays = of_read_number(p++, 1);
> + new_ala.array_sz = of_read_number(p++, 1);
> + new_ala.arrays = p;
> +
I don't know how often associativity lookup arrays needs to be parsed, but
maybe it would be helpful to create a helper function to parse those here.
> + lim = (new_ala.n_arrays > old_ala.n_arrays) ? old_ala.n_arrays :
> + new_ala.n_arrays;
> +
> + if (old_ala.array_sz == new_ala.array_sz) {
> +
> + /* Reset any entries where the old and new rows
> + * the array have changed.
> + */
> + for (i = 0; i < lim; i++) {
> + int index = (i * new_ala.array_sz);
> +
> + if (!memcmp(&old_ala.arrays[index],
> + &new_ala.arrays[index],
> + new_ala.array_sz))
> + continue;
> +
> + pseries_update_ala_memory_aai(i);
> + }
> +
> + /* Reset any entries representing the extra rows.
> + * There shouldn't be any, but just in case ...
> + */
> + for (i = lim; i < new_ala.n_arrays; i++)
> + pseries_update_ala_memory_aai(i);
> +
> + } else {
> + /* Update all entries representing these rows;
> + * as all rows have different sizes, none can
> + * have equivalent values.
> + */
> + for (i = 0; i < lim; i++)
> + pseries_update_ala_memory_aai(i);
> + }
> +
> + return 0;
> +}
> +
> static int pseries_memory_notifier(struct notifier_block *nb,
> unsigned long action, void *data)
> {
> @@ -1059,8 +1139,17 @@ static int pseries_memory_notifier(struct
> notifier_block *nb,
> err = pseries_remove_mem_node(rd->dn);
> break;
> case OF_RECONFIG_UPDATE_PROPERTY:
> - if (!strcmp(rd->prop->name, "ibm,dynamic-memory"))
> - err = pseries_update_drconf_memory(rd);
> + if (!strcmp(rd->prop->name, "ibm,dynamic-memory") ||
> + !strcmp(rd->prop->name, "ibm,dynamic-memory-v2")) {
> + struct drmem_lmb_info *dinfo =
> + drmem_lmbs_init(rd->prop);
> + if (!dinfo)
> + return -EINVAL;
> + err = pseries_update_drconf_memory(dinfo);
> + drmem_lmbs_free(dinfo);
Is this block above related to the other associativity changes? It seems to be
an update for dynamic-memory-v2, so should probably be in a separate patch.
Thanks,
Tom
> + } else if (!strcmp(rd->prop->name,
> + "ibm,associativity-lookup-arrays"))
> + err = pseries_update_ala_memory(rd);
> break;
> }
> return notifier_from_errno(err);
