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Violators will be prosecuted for from ; Tue, 22 May 2018 14:17:47 -0600 Subject: Re: [RFC v5 2/6] powerpc/cpu: Conditionally acquire/release DRC index To: Michael Bringmann , linuxppc-dev@lists.ozlabs.org Cc: John Allen , Tyrel Datwyler , Thomas Falcon References: <70c6aae1-6f91-45d5-361b-0d066101d3d0@linux.vnet.ibm.com> From: Nathan Fontenot Date: Tue, 22 May 2018 15:17:38 -0500 MIME-Version: 1.0 In-Reply-To: <70c6aae1-6f91-45d5-361b-0d066101d3d0@linux.vnet.ibm.com> Content-Type: text/plain; charset=utf-8 Message-Id: List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 05/21/2018 12:52 PM, Michael Bringmann wrote: > powerpc/cpu: Modify dlpar_cpu_add and dlpar_cpu_remove to allow the > skipping of DRC index acquire or release operations during the CPU > add or remove operations. This is intended to support subsequent > changes to provide a 'CPU readd' operation. > > Signed-off-by: Michael Bringmann > --- > arch/powerpc/platforms/pseries/hotplug-cpu.c | 71 +++++++++++++++----------- > 1 file changed, 42 insertions(+), 29 deletions(-) > > diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c > index a408217..ec78cc6 100644 > --- a/arch/powerpc/platforms/pseries/hotplug-cpu.c > +++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c > @@ -474,7 +474,7 @@ static bool valid_cpu_drc_index(struct device_node *parent, u32 drc_index) > &cdata); > } > > -static ssize_t dlpar_cpu_add(u32 drc_index) > +static ssize_t dlpar_cpu_add(u32 drc_index, bool acquire_drc) > { > struct device_node *dn, *parent; > int rc, saved_rc; > @@ -499,19 +499,22 @@ static ssize_t dlpar_cpu_add(u32 drc_index) > return -EINVAL; > } > > - rc = dlpar_acquire_drc(drc_index); > - if (rc) { > - pr_warn("Failed to acquire DRC, rc: %d, drc index: %x\n", > - rc, drc_index); > - of_node_put(parent); > - return -EINVAL; > + if (acquire_drc) { > + rc = dlpar_acquire_drc(drc_index); > + if (rc) { > + pr_warn("Failed to acquire DRC, rc: %d, drc index: %x\n", > + rc, drc_index); > + of_node_put(parent); > + return -EINVAL; > + } > } > > dn = dlpar_configure_connector(cpu_to_be32(drc_index), parent); > if (!dn) { > pr_warn("Failed call to configure-connector, drc index: %x\n", > drc_index); > - dlpar_release_drc(drc_index); > + if (acquire_drc) > + dlpar_release_drc(drc_index); > of_node_put(parent); > return -EINVAL; > } > @@ -526,8 +529,9 @@ static ssize_t dlpar_cpu_add(u32 drc_index) > pr_warn("Failed to attach node %s, rc: %d, drc index: %x\n", > dn->name, rc, drc_index); > > - rc = dlpar_release_drc(drc_index); > - if (!rc) > + if (acquire_drc) > + rc = dlpar_release_drc(drc_index); > + if (!rc || acquire_drc) > dlpar_free_cc_nodes(dn); > > return saved_rc; > @@ -540,7 +544,7 @@ static ssize_t dlpar_cpu_add(u32 drc_index) > dn->name, rc, drc_index); > > rc = dlpar_detach_node(dn); > - if (!rc) > + if (!rc && acquire_drc) > dlpar_release_drc(drc_index); > > return saved_rc; > @@ -608,7 +612,8 @@ static int dlpar_offline_cpu(struct device_node *dn) > > } > > -static ssize_t dlpar_cpu_remove(struct device_node *dn, u32 drc_index) > +static ssize_t dlpar_cpu_remove(struct device_node *dn, u32 drc_index, > + bool release_drc) > { > int rc; > > @@ -621,12 +626,14 @@ static ssize_t dlpar_cpu_remove(struct device_node *dn, u32 drc_index) > return -EINVAL; > } > > - rc = dlpar_release_drc(drc_index); > - if (rc) { > - pr_warn("Failed to release drc (%x) for CPU %s, rc: %d\n", > - drc_index, dn->name, rc); > - dlpar_online_cpu(dn); > - return rc; > + if (release_drc) { > + rc = dlpar_release_drc(drc_index); > + if (rc) { > + pr_warn("Failed to release drc (%x) for CPU %s, rc: %d\n", > + drc_index, dn->name, rc); > + dlpar_online_cpu(dn); > + return rc; > + } > } > > rc = dlpar_detach_node(dn); > @@ -635,7 +642,10 @@ static ssize_t dlpar_cpu_remove(struct device_node *dn, u32 drc_index) > > pr_warn("Failed to detach CPU %s, rc: %d", dn->name, rc); > > - rc = dlpar_acquire_drc(drc_index); > + if (release_drc) > + rc = dlpar_acquire_drc(drc_index); > + else > + rc = 0; > if (!rc) > dlpar_online_cpu(dn); > > @@ -664,7 +674,7 @@ static struct device_node *cpu_drc_index_to_dn(u32 drc_index) > return dn; > } > > -static int dlpar_cpu_remove_by_index(u32 drc_index) > +static int dlpar_cpu_remove_by_index(u32 drc_index, bool release_drc) > { > struct device_node *dn; > int rc; > @@ -676,7 +686,7 @@ static int dlpar_cpu_remove_by_index(u32 drc_index) > return -ENODEV; > } > > - rc = dlpar_cpu_remove(dn, drc_index); > + rc = dlpar_cpu_remove(dn, drc_index, release_drc); > of_node_put(dn); > return rc; > } > @@ -741,7 +751,7 @@ static int dlpar_cpu_remove_by_count(u32 cpus_to_remove) > } > > for (i = 0; i < cpus_to_remove; i++) { > - rc = dlpar_cpu_remove_by_index(cpu_drcs[i]); > + rc = dlpar_cpu_remove_by_index(cpu_drcs[i], true); > if (rc) > break; > > @@ -752,7 +762,7 @@ static int dlpar_cpu_remove_by_count(u32 cpus_to_remove) > pr_warn("CPU hot-remove failed, adding back removed CPUs\n"); > > for (i = 0; i < cpus_removed; i++) > - dlpar_cpu_add(cpu_drcs[i]); > + dlpar_cpu_add(cpu_drcs[i], true); > > rc = -EINVAL; > } else { > @@ -843,7 +853,7 @@ static int dlpar_cpu_add_by_count(u32 cpus_to_add) > } > > for (i = 0; i < cpus_to_add; i++) { > - rc = dlpar_cpu_add(cpu_drcs[i]); > + rc = dlpar_cpu_add(cpu_drcs[i], true); > if (rc) > break; > > @@ -854,7 +864,7 @@ static int dlpar_cpu_add_by_count(u32 cpus_to_add) > pr_warn("CPU hot-add failed, removing any added CPUs\n"); > > for (i = 0; i < cpus_added; i++) > - dlpar_cpu_remove_by_index(cpu_drcs[i]); > + dlpar_cpu_remove_by_index(cpu_drcs[i], true); > > rc = -EINVAL; > } else { > @@ -880,7 +890,7 @@ int dlpar_cpu(struct pseries_hp_errorlog *hp_elog) > if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_COUNT) > rc = dlpar_cpu_remove_by_count(count); > else if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX) > - rc = dlpar_cpu_remove_by_index(drc_index); > + rc = dlpar_cpu_remove_by_index(drc_index, true); > else > rc = -EINVAL; > break; > @@ -888,7 +898,7 @@ int dlpar_cpu(struct pseries_hp_errorlog *hp_elog) > if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_COUNT) > rc = dlpar_cpu_add_by_count(count); > else if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX) > - rc = dlpar_cpu_add(drc_index); > + rc = dlpar_cpu_add(drc_index, true); > else > rc = -EINVAL; > break; > @@ -913,7 +923,7 @@ static ssize_t dlpar_cpu_probe(const char *buf, size_t count) > if (rc) > return -EINVAL; > > - rc = dlpar_cpu_add(drc_index); > + rc = dlpar_cpu_add(drc_index, true); > > return rc ? rc : count; > } > @@ -934,7 +944,7 @@ static ssize_t dlpar_cpu_release(const char *buf, size_t count) > return -EINVAL; > } > > - rc = dlpar_cpu_remove(dn, drc_index); > + rc = dlpar_cpu_remove(dn, drc_index, true); > of_node_put(dn); > > return rc ? rc : count; > @@ -948,6 +958,9 @@ static int pseries_smp_notifier(struct notifier_block *nb, > struct of_reconfig_data *rd = data; > int err = 0; > > + if (strcmp(rd->dn->type, "cpu")) > + return notifier_from_errno(err);> + This last change doesn't seem to fit in this patch, should this be a part of a different patch? -Nathan > switch (action) { > case OF_RECONFIG_ATTACH_NODE: > err = pseries_add_processor(rd->dn); >