powerpc/pseries: Move lparcfg.c to platforms/pseries

This file is entirely pseries specific nowadays, so move it out
of arch/powerpc/kernel where it doesn't belong anymore.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 711 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index 8ae010381316..6c61ec5ee914 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_CMM)		+= cmm.o
 obj-$(CONFIG_DTL)               += dtl.o
 obj-$(CONFIG_IO_EVENT_IRQ)      += io_event_irq.o
 obj-$(CONFIG_PSERIES_IDLE)      += processor_idle.o
+obj-$(CONFIG_LPARCFG)           += lparcfg.o
 
 ifeq ($(CONFIG_PPC_PSERIES),y)
 obj-$(CONFIG_SUSPEND)           += suspend.o
diff --git a/arch/powerpc/platforms/pseries/lparcfg.c b/arch/powerpc/platforms/pseries/lparcfg.c
new file mode 100644
index 000000000000..e738007eae64
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/lparcfg.c
@@ -0,0 +1,710 @@
+/*
+ * PowerPC64 LPAR Configuration Information Driver
+ *
+ * Dave Engebretsen engebret@us.ibm.com
+ *    Copyright (c) 2003 Dave Engebretsen
+ * Will Schmidt willschm@us.ibm.com
+ *    SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
+ *    seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
+ * Nathan Lynch nathanl@austin.ibm.com
+ *    Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ *
+ * This driver creates a proc file at /proc/ppc64/lparcfg which contains
+ * keyword - value pairs that specify the configuration of the partition.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <asm/uaccess.h>
+#include <asm/lppaca.h>
+#include <asm/hvcall.h>
+#include <asm/firmware.h>
+#include <asm/rtas.h>
+#include <asm/time.h>
+#include <asm/prom.h>
+#include <asm/vdso_datapage.h>
+#include <asm/vio.h>
+#include <asm/mmu.h>
+#include <asm/machdep.h>
+
+
+/*
+ * This isn't a module but we expose that to userspace
+ * via /proc so leave the definitions here
+ */
+#define MODULE_VERS "1.9"
+#define MODULE_NAME "lparcfg"
+
+/* #define LPARCFG_DEBUG */
+
+/*
+ * Track sum of all purrs across all processors. This is used to further
+ * calculate usage values by different applications
+ */
+static unsigned long get_purr(void)
+{
+        unsigned long sum_purr = 0;
+        int cpu;
+
+        for_each_possible_cpu(cpu) {
+                struct cpu_usage *cu;
+
+                cu = &per_cpu(cpu_usage_array, cpu);
+                sum_purr += cu->current_tb;
+        }
+        return sum_purr;
+}
+
+/*
+ * Methods used to fetch LPAR data when running on a pSeries platform.
+ */
+
+struct hvcall_ppp_data {
+        u64     entitlement;
+        u64     unallocated_entitlement;
+        u16     group_num;
+        u16     pool_num;
+        u8      capped;
+        u8      weight;
+        u8      unallocated_weight;
+        u16     active_procs_in_pool;
+        u16     active_system_procs;
+        u16     phys_platform_procs;
+        u32     max_proc_cap_avail;
+        u32     entitled_proc_cap_avail;
+};
+
+/*
+ * H_GET_PPP hcall returns info in 4 parms.
+ *  entitled_capacity,unallocated_capacity,
+ *  aggregation, resource_capability).
+ *
+ *  R4 = Entitled Processor Capacity Percentage.
+ *  R5 = Unallocated Processor Capacity Percentage.
+ *  R6 (AABBCCDDEEFFGGHH).
+ *      XXXX - reserved (0)
+ *          XXXX - reserved (0)
+ *              XXXX - Group Number
+ *                  XXXX - Pool Number.
+ *  R7 (IIJJKKLLMMNNOOPP).
+ *      XX - reserved. (0)
+ *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
+ *          XX - variable processor Capacity Weight
+ *            XX - Unallocated Variable Processor Capacity Weight.
+ *              XXXX - Active processors in Physical Processor Pool.
+ *                  XXXX  - Processors active on platform.
+ *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
+ *      XXXX - Physical platform procs allocated to virtualization.
+ *          XXXXXX - Max procs capacity % available to the partitions pool.
+ *                XXXXXX - Entitled procs capacity % available to the
+ *                         partitions pool.
+ */
+static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
+{
+        unsigned long rc;
+        unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
+
+        rc = plpar_hcall9(H_GET_PPP, retbuf);
+
+        ppp_data->entitlement = retbuf[0];
+        ppp_data->unallocated_entitlement = retbuf[1];
+
+        ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
+        ppp_data->pool_num = retbuf[2] & 0xffff;
+
+        ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
+        ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
+        ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
+        ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
+        ppp_data->active_system_procs = retbuf[3] & 0xffff;
+
+        ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
+        ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
+        ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
+
+        return rc;
+}
+
+static unsigned h_pic(unsigned long *pool_idle_time,
+                      unsigned long *num_procs)
+{
+        unsigned long rc;
+        unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+
+        rc = plpar_hcall(H_PIC, retbuf);
+
+        *pool_idle_time = retbuf[0];
+        *num_procs = retbuf[1];
+
+        return rc;
+}
+
+/*
+ * parse_ppp_data
+ * Parse out the data returned from h_get_ppp and h_pic
+ */
+static void parse_ppp_data(struct seq_file *m)
+{
+        struct hvcall_ppp_data ppp_data;
+        struct device_node *root;
+        const int *perf_level;
+        int rc;
+
+        rc = h_get_ppp(&ppp_data);
+        if (rc)
+                return;
+
+        seq_printf(m, "partition_entitled_capacity=%lld\n",
+                   ppp_data.entitlement);
+        seq_printf(m, "group=%d\n", ppp_data.group_num);
+        seq_printf(m, "system_active_processors=%d\n",
+                   ppp_data.active_system_procs);
+
+        /* pool related entries are appropriate for shared configs */
+        if (lppaca_shared_proc(get_lppaca())) {
+                unsigned long pool_idle_time, pool_procs;
+
+                seq_printf(m, "pool=%d\n", ppp_data.pool_num);
+
+                /* report pool_capacity in percentage */
+                seq_printf(m, "pool_capacity=%d\n",
+                           ppp_data.active_procs_in_pool * 100);
+
+                h_pic(&pool_idle_time, &pool_procs);
+                seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
+                seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
+        }
+
+        seq_printf(m, "unallocated_capacity_weight=%d\n",
+                   ppp_data.unallocated_weight);
+        seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
+        seq_printf(m, "capped=%d\n", ppp_data.capped);
+        seq_printf(m, "unallocated_capacity=%lld\n",
+                   ppp_data.unallocated_entitlement);
+
+        /* The last bits of information returned from h_get_ppp are only
+         * valid if the ibm,partition-performance-parameters-level
+         * property is >= 1.
+         */
+        root = of_find_node_by_path("/");
+        if (root) {
+                perf_level = of_get_property(root,
+                                "ibm,partition-performance-parameters-level",
+                                             NULL);
+                if (perf_level && (*perf_level >= 1)) {
+                        seq_printf(m,
+                            "physical_procs_allocated_to_virtualization=%d\n",
+                                   ppp_data.phys_platform_procs);
+                        seq_printf(m, "max_proc_capacity_available=%d\n",
+                                   ppp_data.max_proc_cap_avail);
+                        seq_printf(m, "entitled_proc_capacity_available=%d\n",
+                                   ppp_data.entitled_proc_cap_avail);
+                }
+
+                of_node_put(root);
+        }
+}
+
+/**
+ * parse_mpp_data
+ * Parse out data returned from h_get_mpp
+ */
+static void parse_mpp_data(struct seq_file *m)
+{
+        struct hvcall_mpp_data mpp_data;
+        int rc;
+
+        rc = h_get_mpp(&mpp_data);
+        if (rc)
+                return;
+
+        seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
+
+        if (mpp_data.mapped_mem != -1)
+                seq_printf(m, "mapped_entitled_memory=%ld\n",
+                           mpp_data.mapped_mem);
+
+        seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
+        seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
+
+        seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
+        seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
+                   mpp_data.unallocated_mem_weight);
+        seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
+                   mpp_data.unallocated_entitlement);
+
+        if (mpp_data.pool_size != -1)
+                seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
+                           mpp_data.pool_size);
+
+        seq_printf(m, "entitled_memory_loan_request=%ld\n",
+                   mpp_data.loan_request);
+
+        seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
+}
+
+/**
+ * parse_mpp_x_data
+ * Parse out data returned from h_get_mpp_x
+ */
+static void parse_mpp_x_data(struct seq_file *m)
+{
+        struct hvcall_mpp_x_data mpp_x_data;
+
+        if (!firmware_has_feature(FW_FEATURE_XCMO))
+                return;
+        if (h_get_mpp_x(&mpp_x_data))
+                return;
+
+        seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
+
+        if (mpp_x_data.pool_coalesced_bytes)
+                seq_printf(m, "pool_coalesced_bytes=%ld\n",
+                           mpp_x_data.pool_coalesced_bytes);
+        if (mpp_x_data.pool_purr_cycles)
+                seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
+        if (mpp_x_data.pool_spurr_cycles)
+                seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
+}
+
+#define SPLPAR_CHARACTERISTICS_TOKEN 20
+#define SPLPAR_MAXLENGTH 1026*(sizeof(char))
+
+/*
+ * parse_system_parameter_string()
+ * Retrieve the potential_processors, max_entitled_capacity and friends
+ * through the get-system-parameter rtas call.  Replace keyword strings as
+ * necessary.
+ */
+static void parse_system_parameter_string(struct seq_file *m)
+{
+        int call_status;
+
+        unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
+        if (!local_buffer) {
+                printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
+                       __FILE__, __func__, __LINE__);
+                return;
+        }
+
+        spin_lock(&rtas_data_buf_lock);
+        memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
+        call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
+                                NULL,
+                                SPLPAR_CHARACTERISTICS_TOKEN,
+                                __pa(rtas_data_buf),
+                                RTAS_DATA_BUF_SIZE);
+        memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
+        local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
+        spin_unlock(&rtas_data_buf_lock);
+
+        if (call_status != 0) {
+                printk(KERN_INFO
+                       "%s %s Error calling get-system-parameter (0x%x)\n",
+                       __FILE__, __func__, call_status);
+        } else {
+                int splpar_strlen;
+                int idx, w_idx;
+                char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
+                if (!workbuffer) {
+                        printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
+                               __FILE__, __func__, __LINE__);
+                        kfree(local_buffer);
+                        return;
+                }
+#ifdef LPARCFG_DEBUG
+                printk(KERN_INFO "success calling get-system-parameter\n");
+#endif
+                splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
+                local_buffer += 2;      /* step over strlen value */
+
+                w_idx = 0;
+                idx = 0;
+                while ((*local_buffer) && (idx < splpar_strlen)) {
+                        workbuffer[w_idx++] = local_buffer[idx++];
+                        if ((local_buffer[idx] == ',')
+                            || (local_buffer[idx] == '\0')) {
+                                workbuffer[w_idx] = '\0';
+                                if (w_idx) {
+                                        /* avoid the empty string */
+                                        seq_printf(m, "%s\n", workbuffer);
+                                }
+                                memset(workbuffer, 0, SPLPAR_MAXLENGTH);
+                                idx++;  /* skip the comma */
+                                w_idx = 0;
+                        } else if (local_buffer[idx] == '=') {
+                                /* code here to replace workbuffer contents
+                                   with different keyword strings */
+                                if (0 == strcmp(workbuffer, "MaxEntCap")) {
+                                        strcpy(workbuffer,
+                                               "partition_max_entitled_capacity");
+                                        w_idx = strlen(workbuffer);
+                                }
+                                if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
+                                        strcpy(workbuffer,
+                                               "system_potential_processors");
+                                        w_idx = strlen(workbuffer);
+                                }
+                        }
+                }
+                kfree(workbuffer);
+                local_buffer -= 2;      /* back up over strlen value */
+        }
+        kfree(local_buffer);
+}
+
+/* Return the number of processors in the system.
+ * This function reads through the device tree and counts
+ * the virtual processors, this does not include threads.
+ */
+static int lparcfg_count_active_processors(void)
+{
+        struct device_node *cpus_dn = NULL;
+        int count = 0;
+
+        while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
+#ifdef LPARCFG_DEBUG
+                printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
+#endif
+                count++;
+        }
+        return count;
+}
+
+static void pseries_cmo_data(struct seq_file *m)
+{
+        int cpu;
+        unsigned long cmo_faults = 0;
+        unsigned long cmo_fault_time = 0;
+
+        seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
+
+        if (!firmware_has_feature(FW_FEATURE_CMO))
+                return;
+
+        for_each_possible_cpu(cpu) {
+                cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
+                cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
+        }
+
+        seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
+        seq_printf(m, "cmo_fault_time_usec=%lu\n",
+                   cmo_fault_time / tb_ticks_per_usec);
+        seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
+        seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
+        seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
+}
+
+static void splpar_dispatch_data(struct seq_file *m)
+{
+        int cpu;
+        unsigned long dispatches = 0;
+        unsigned long dispatch_dispersions = 0;
+
+        for_each_possible_cpu(cpu) {
+                dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
+                dispatch_dispersions +=
+                        be32_to_cpu(lppaca_of(cpu).dispersion_count);
+        }
+
+        seq_printf(m, "dispatches=%lu\n", dispatches);
+        seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
+}
+
+static void parse_em_data(struct seq_file *m)
+{
+        unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+
+        if (firmware_has_feature(FW_FEATURE_LPAR) &&
+            plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
+                seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
+}
+
+static int pseries_lparcfg_data(struct seq_file *m, void *v)
+{
+        int partition_potential_processors;
+        int partition_active_processors;
+        struct device_node *rtas_node;
+        const int *lrdrp = NULL;
+
+        rtas_node = of_find_node_by_path("/rtas");
+        if (rtas_node)
+                lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
+
+        if (lrdrp == NULL) {
+                partition_potential_processors = vdso_data->processorCount;
+        } else {
+                partition_potential_processors = *(lrdrp + 4);
+        }
+        of_node_put(rtas_node);
+
+        partition_active_processors = lparcfg_count_active_processors();
+
+        if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
+                /* this call handles the ibm,get-system-parameter contents */
+                parse_system_parameter_string(m);
+                parse_ppp_data(m);
+                parse_mpp_data(m);
+                parse_mpp_x_data(m);
+                pseries_cmo_data(m);
+                splpar_dispatch_data(m);
+
+                seq_printf(m, "purr=%ld\n", get_purr());
+        } else {                /* non SPLPAR case */
+
+                seq_printf(m, "system_active_processors=%d\n",
+                           partition_potential_processors);
+
+                seq_printf(m, "system_potential_processors=%d\n",
+                           partition_potential_processors);
+
+                seq_printf(m, "partition_max_entitled_capacity=%d\n",
+                           partition_potential_processors * 100);
+
+                seq_printf(m, "partition_entitled_capacity=%d\n",
+                           partition_active_processors * 100);
+        }
+
+        seq_printf(m, "partition_active_processors=%d\n",
+                   partition_active_processors);
+
+        seq_printf(m, "partition_potential_processors=%d\n",
+                   partition_potential_processors);
+
+        seq_printf(m, "shared_processor_mode=%d\n",
+                   lppaca_shared_proc(get_lppaca()));
+
+        seq_printf(m, "slb_size=%d\n", mmu_slb_size);
+
+        parse_em_data(m);
+
+        return 0;
+}
+
+static ssize_t update_ppp(u64 *entitlement, u8 *weight)
+{
+        struct hvcall_ppp_data ppp_data;
+        u8 new_weight;
+        u64 new_entitled;
+        ssize_t retval;
+
+        /* Get our current parameters */
+        retval = h_get_ppp(&ppp_data);
+        if (retval)
+                return retval;
+
+        if (entitlement) {
+                new_weight = ppp_data.weight;
+                new_entitled = *entitlement;
+        } else if (weight) {
+                new_weight = *weight;
+                new_entitled = ppp_data.entitlement;
+        } else
+                return -EINVAL;
+
+        pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
+                 __func__, ppp_data.entitlement, ppp_data.weight);
+
+        pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
+                 __func__, new_entitled, new_weight);
+
+        retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
+        return retval;
+}
+
+/**
+ * update_mpp
+ *
+ * Update the memory entitlement and weight for the partition.  Caller must
+ * specify either a new entitlement or weight, not both, to be updated
+ * since the h_set_mpp call takes both entitlement and weight as parameters.
+ */
+static ssize_t update_mpp(u64 *entitlement, u8 *weight)
+{
+        struct hvcall_mpp_data mpp_data;
+        u64 new_entitled;
+        u8 new_weight;
+        ssize_t rc;
+
+        if (entitlement) {
+                /* Check with vio to ensure the new memory entitlement
+                 * can be handled.
+                 */
+                rc = vio_cmo_entitlement_update(*entitlement);
+                if (rc)
+                        return rc;
+        }
+
+        rc = h_get_mpp(&mpp_data);
+        if (rc)
+                return rc;
+
+        if (entitlement) {
+                new_weight = mpp_data.mem_weight;
+                new_entitled = *entitlement;
+        } else if (weight) {
+                new_weight = *weight;
+                new_entitled = mpp_data.entitled_mem;
+        } else
+                return -EINVAL;
+
+        pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
+                 __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
+
+        pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
+                 __func__, new_entitled, new_weight);
+
+        rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
+        return rc;
+}
+
+/*
+ * Interface for changing system parameters (variable capacity weight
+ * and entitled capacity).  Format of input is "param_name=value";
+ * anything after value is ignored.  Valid parameters at this time are
+ * "partition_entitled_capacity" and "capacity_weight".  We use
+ * H_SET_PPP to alter parameters.
+ *
+ * This function should be invoked only on systems with
+ * FW_FEATURE_SPLPAR.
+ */
+static ssize_t lparcfg_write(struct file *file, const char __user * buf,
+                             size_t count, loff_t * off)
+{
+        int kbuf_sz = 64;
+        char kbuf[kbuf_sz];
+        char *tmp;
+        u64 new_entitled, *new_entitled_ptr = &new_entitled;
+        u8 new_weight, *new_weight_ptr = &new_weight;
+        ssize_t retval;
+
+        if (!firmware_has_feature(FW_FEATURE_SPLPAR))
+                return -EINVAL;
+
+        if (count > kbuf_sz)
+                return -EINVAL;
+
+        if (copy_from_user(kbuf, buf, count))
+                return -EFAULT;
+
+        kbuf[count - 1] = '\0';
+        tmp = strchr(kbuf, '=');
+        if (!tmp)
+                return -EINVAL;
+
+        *tmp++ = '\0';
+
+        if (!strcmp(kbuf, "partition_entitled_capacity")) {
+                char *endp;
+                *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
+                if (endp == tmp)
+                        return -EINVAL;
+
+                retval = update_ppp(new_entitled_ptr, NULL);
+        } else if (!strcmp(kbuf, "capacity_weight")) {
+                char *endp;
+                *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
+                if (endp == tmp)
+                        return -EINVAL;
+
+                retval = update_ppp(NULL, new_weight_ptr);
+        } else if (!strcmp(kbuf, "entitled_memory")) {
+                char *endp;
+                *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
+                if (endp == tmp)
+                        return -EINVAL;
+
+                retval = update_mpp(new_entitled_ptr, NULL);
+        } else if (!strcmp(kbuf, "entitled_memory_weight")) {
+                char *endp;
+                *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
+                if (endp == tmp)
+                        return -EINVAL;
+
+                retval = update_mpp(NULL, new_weight_ptr);
+        } else
+                return -EINVAL;
+
+        if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
+                retval = count;
+        } else if (retval == H_BUSY) {
+                retval = -EBUSY;
+        } else if (retval == H_HARDWARE) {
+                retval = -EIO;
+        } else if (retval == H_PARAMETER) {
+                retval = -EINVAL;
+        }
+
+        return retval;
+}
+
+static int lparcfg_data(struct seq_file *m, void *v)
+{
+        struct device_node *rootdn;
+        const char *model = "";
+        const char *system_id = "";
+        const char *tmp;
+        const unsigned int *lp_index_ptr;
+        unsigned int lp_index = 0;
+
+        seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
+
+        rootdn = of_find_node_by_path("/");
+        if (rootdn) {
+                tmp = of_get_property(rootdn, "model", NULL);
+                if (tmp)
+                        model = tmp;
+                tmp = of_get_property(rootdn, "system-id", NULL);
+                if (tmp)
+                        system_id = tmp;
+                lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
+                                        NULL);
+                if (lp_index_ptr)
+                        lp_index = *lp_index_ptr;
+                of_node_put(rootdn);
+        }
+        seq_printf(m, "serial_number=%s\n", system_id);
+        seq_printf(m, "system_type=%s\n", model);
+        seq_printf(m, "partition_id=%d\n", (int)lp_index);
+
+        return pseries_lparcfg_data(m, v);
+}
+
+static int lparcfg_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, lparcfg_data, NULL);
+}
+
+static const struct file_operations lparcfg_fops = {
+        .read           = seq_read,
+        .write          = lparcfg_write,
+        .open           = lparcfg_open,
+        .release        = single_release,
+        .llseek         = seq_lseek,
+};
+
+static int __init lparcfg_init(void)
+{
+        umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
+
+        /* Allow writing if we have FW_FEATURE_SPLPAR */
+        if (firmware_has_feature(FW_FEATURE_SPLPAR))
+                mode |= S_IWUSR;
+
+        if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops)) {
+                printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
+                return -EIO;
+        }
+        return 0;
+}
+machine_device_initcall(pseries, lparcfg_init);