1607 lines
42 KiB
C
1607 lines
42 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define pr_fmt(fmt) "papr-scm: " fmt
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#include <linux/of.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/ndctl.h>
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#include <linux/sched.h>
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#include <linux/libnvdimm.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/seq_buf.h>
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#include <linux/nd.h>
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#include <asm/plpar_wrappers.h>
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#include <asm/papr_pdsm.h>
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#include <asm/mce.h>
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#include <asm/unaligned.h>
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#include <linux/perf_event.h>
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#define BIND_ANY_ADDR (~0ul)
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#define PAPR_SCM_DIMM_CMD_MASK \
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((1ul << ND_CMD_GET_CONFIG_SIZE) | \
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(1ul << ND_CMD_GET_CONFIG_DATA) | \
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(1ul << ND_CMD_SET_CONFIG_DATA) | \
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(1ul << ND_CMD_CALL))
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/* DIMM health bitmap bitmap indicators */
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/* SCM device is unable to persist memory contents */
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#define PAPR_PMEM_UNARMED (1ULL << (63 - 0))
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/* SCM device failed to persist memory contents */
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#define PAPR_PMEM_SHUTDOWN_DIRTY (1ULL << (63 - 1))
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/* SCM device contents are persisted from previous IPL */
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#define PAPR_PMEM_SHUTDOWN_CLEAN (1ULL << (63 - 2))
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/* SCM device contents are not persisted from previous IPL */
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#define PAPR_PMEM_EMPTY (1ULL << (63 - 3))
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/* SCM device memory life remaining is critically low */
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#define PAPR_PMEM_HEALTH_CRITICAL (1ULL << (63 - 4))
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/* SCM device will be garded off next IPL due to failure */
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#define PAPR_PMEM_HEALTH_FATAL (1ULL << (63 - 5))
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/* SCM contents cannot persist due to current platform health status */
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#define PAPR_PMEM_HEALTH_UNHEALTHY (1ULL << (63 - 6))
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/* SCM device is unable to persist memory contents in certain conditions */
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#define PAPR_PMEM_HEALTH_NON_CRITICAL (1ULL << (63 - 7))
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/* SCM device is encrypted */
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#define PAPR_PMEM_ENCRYPTED (1ULL << (63 - 8))
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/* SCM device has been scrubbed and locked */
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#define PAPR_PMEM_SCRUBBED_AND_LOCKED (1ULL << (63 - 9))
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/* Bits status indicators for health bitmap indicating unarmed dimm */
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#define PAPR_PMEM_UNARMED_MASK (PAPR_PMEM_UNARMED | \
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PAPR_PMEM_HEALTH_UNHEALTHY)
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/* Bits status indicators for health bitmap indicating unflushed dimm */
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#define PAPR_PMEM_BAD_SHUTDOWN_MASK (PAPR_PMEM_SHUTDOWN_DIRTY)
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/* Bits status indicators for health bitmap indicating unrestored dimm */
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#define PAPR_PMEM_BAD_RESTORE_MASK (PAPR_PMEM_EMPTY)
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/* Bit status indicators for smart event notification */
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#define PAPR_PMEM_SMART_EVENT_MASK (PAPR_PMEM_HEALTH_CRITICAL | \
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PAPR_PMEM_HEALTH_FATAL | \
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PAPR_PMEM_HEALTH_UNHEALTHY)
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#define PAPR_SCM_PERF_STATS_EYECATCHER __stringify(SCMSTATS)
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#define PAPR_SCM_PERF_STATS_VERSION 0x1
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/* Struct holding a single performance metric */
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struct papr_scm_perf_stat {
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u8 stat_id[8];
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__be64 stat_val;
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} __packed;
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/* Struct exchanged between kernel and PHYP for fetching drc perf stats */
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struct papr_scm_perf_stats {
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u8 eye_catcher[8];
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/* Should be PAPR_SCM_PERF_STATS_VERSION */
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__be32 stats_version;
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/* Number of stats following */
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__be32 num_statistics;
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/* zero or more performance matrics */
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struct papr_scm_perf_stat scm_statistic[];
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} __packed;
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/* private struct associated with each region */
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struct papr_scm_priv {
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struct platform_device *pdev;
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struct device_node *dn;
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uint32_t drc_index;
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uint64_t blocks;
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uint64_t block_size;
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int metadata_size;
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bool is_volatile;
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bool hcall_flush_required;
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uint64_t bound_addr;
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struct nvdimm_bus_descriptor bus_desc;
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struct nvdimm_bus *bus;
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struct nvdimm *nvdimm;
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struct resource res;
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struct nd_region *region;
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struct nd_interleave_set nd_set;
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struct list_head region_list;
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/* Protect dimm health data from concurrent read/writes */
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struct mutex health_mutex;
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/* Last time the health information of the dimm was updated */
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unsigned long lasthealth_jiffies;
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/* Health information for the dimm */
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u64 health_bitmap;
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/* Holds the last known dirty shutdown counter value */
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u64 dirty_shutdown_counter;
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/* length of the stat buffer as expected by phyp */
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size_t stat_buffer_len;
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/* The bits which needs to be overridden */
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u64 health_bitmap_inject_mask;
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/* array to have event_code and stat_id mappings */
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u8 *nvdimm_events_map;
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};
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static int papr_scm_pmem_flush(struct nd_region *nd_region,
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struct bio *bio __maybe_unused)
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{
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struct papr_scm_priv *p = nd_region_provider_data(nd_region);
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unsigned long ret_buf[PLPAR_HCALL_BUFSIZE], token = 0;
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long rc;
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dev_dbg(&p->pdev->dev, "flush drc 0x%x", p->drc_index);
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do {
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rc = plpar_hcall(H_SCM_FLUSH, ret_buf, p->drc_index, token);
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token = ret_buf[0];
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/* Check if we are stalled for some time */
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if (H_IS_LONG_BUSY(rc)) {
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msleep(get_longbusy_msecs(rc));
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rc = H_BUSY;
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} else if (rc == H_BUSY) {
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cond_resched();
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}
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} while (rc == H_BUSY);
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if (rc) {
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dev_err(&p->pdev->dev, "flush error: %ld", rc);
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rc = -EIO;
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} else {
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dev_dbg(&p->pdev->dev, "flush drc 0x%x complete", p->drc_index);
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}
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return rc;
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}
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static LIST_HEAD(papr_nd_regions);
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static DEFINE_MUTEX(papr_ndr_lock);
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static int drc_pmem_bind(struct papr_scm_priv *p)
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{
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unsigned long ret[PLPAR_HCALL_BUFSIZE];
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uint64_t saved = 0;
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uint64_t token;
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int64_t rc;
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/*
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* When the hypervisor cannot map all the requested memory in a single
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* hcall it returns H_BUSY and we call again with the token until
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* we get H_SUCCESS. Aborting the retry loop before getting H_SUCCESS
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* leave the system in an undefined state, so we wait.
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*/
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token = 0;
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do {
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rc = plpar_hcall(H_SCM_BIND_MEM, ret, p->drc_index, 0,
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p->blocks, BIND_ANY_ADDR, token);
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token = ret[0];
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if (!saved)
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saved = ret[1];
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cond_resched();
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} while (rc == H_BUSY);
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if (rc)
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return rc;
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p->bound_addr = saved;
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dev_dbg(&p->pdev->dev, "bound drc 0x%x to 0x%lx\n",
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p->drc_index, (unsigned long)saved);
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return rc;
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}
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static void drc_pmem_unbind(struct papr_scm_priv *p)
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{
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unsigned long ret[PLPAR_HCALL_BUFSIZE];
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uint64_t token = 0;
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int64_t rc;
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dev_dbg(&p->pdev->dev, "unbind drc 0x%x\n", p->drc_index);
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/* NB: unbind has the same retry requirements as drc_pmem_bind() */
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do {
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/* Unbind of all SCM resources associated with drcIndex */
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rc = plpar_hcall(H_SCM_UNBIND_ALL, ret, H_UNBIND_SCOPE_DRC,
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p->drc_index, token);
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token = ret[0];
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/* Check if we are stalled for some time */
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if (H_IS_LONG_BUSY(rc)) {
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msleep(get_longbusy_msecs(rc));
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rc = H_BUSY;
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} else if (rc == H_BUSY) {
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cond_resched();
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}
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} while (rc == H_BUSY);
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if (rc)
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dev_err(&p->pdev->dev, "unbind error: %lld\n", rc);
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else
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dev_dbg(&p->pdev->dev, "unbind drc 0x%x complete\n",
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p->drc_index);
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return;
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}
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static int drc_pmem_query_n_bind(struct papr_scm_priv *p)
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{
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unsigned long start_addr;
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unsigned long end_addr;
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unsigned long ret[PLPAR_HCALL_BUFSIZE];
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int64_t rc;
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rc = plpar_hcall(H_SCM_QUERY_BLOCK_MEM_BINDING, ret,
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p->drc_index, 0);
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if (rc)
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goto err_out;
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start_addr = ret[0];
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/* Make sure the full region is bound. */
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rc = plpar_hcall(H_SCM_QUERY_BLOCK_MEM_BINDING, ret,
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p->drc_index, p->blocks - 1);
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if (rc)
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goto err_out;
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end_addr = ret[0];
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if ((end_addr - start_addr) != ((p->blocks - 1) * p->block_size))
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goto err_out;
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p->bound_addr = start_addr;
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dev_dbg(&p->pdev->dev, "bound drc 0x%x to 0x%lx\n", p->drc_index, start_addr);
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return rc;
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err_out:
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dev_info(&p->pdev->dev,
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"Failed to query, trying an unbind followed by bind");
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drc_pmem_unbind(p);
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return drc_pmem_bind(p);
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}
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/*
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* Query the Dimm performance stats from PHYP and copy them (if returned) to
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* provided struct papr_scm_perf_stats instance 'stats' that can hold atleast
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* (num_stats + header) bytes.
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* - If buff_stats == NULL the return value is the size in bytes of the buffer
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* needed to hold all supported performance-statistics.
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* - If buff_stats != NULL and num_stats == 0 then we copy all known
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* performance-statistics to 'buff_stat' and expect to be large enough to
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* hold them.
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* - if buff_stats != NULL and num_stats > 0 then copy the requested
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* performance-statistics to buff_stats.
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*/
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static ssize_t drc_pmem_query_stats(struct papr_scm_priv *p,
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struct papr_scm_perf_stats *buff_stats,
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unsigned int num_stats)
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{
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unsigned long ret[PLPAR_HCALL_BUFSIZE];
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size_t size;
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s64 rc;
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/* Setup the out buffer */
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if (buff_stats) {
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memcpy(buff_stats->eye_catcher,
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PAPR_SCM_PERF_STATS_EYECATCHER, 8);
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buff_stats->stats_version =
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cpu_to_be32(PAPR_SCM_PERF_STATS_VERSION);
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buff_stats->num_statistics =
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cpu_to_be32(num_stats);
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/*
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* Calculate the buffer size based on num-stats provided
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* or use the prefetched max buffer length
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*/
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if (num_stats)
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/* Calculate size from the num_stats */
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size = sizeof(struct papr_scm_perf_stats) +
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num_stats * sizeof(struct papr_scm_perf_stat);
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else
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size = p->stat_buffer_len;
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} else {
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/* In case of no out buffer ignore the size */
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size = 0;
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}
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/* Do the HCALL asking PHYP for info */
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rc = plpar_hcall(H_SCM_PERFORMANCE_STATS, ret, p->drc_index,
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buff_stats ? virt_to_phys(buff_stats) : 0,
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size);
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/* Check if the error was due to an unknown stat-id */
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if (rc == H_PARTIAL) {
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dev_err(&p->pdev->dev,
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"Unknown performance stats, Err:0x%016lX\n", ret[0]);
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return -ENOENT;
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} else if (rc == H_AUTHORITY) {
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dev_info(&p->pdev->dev,
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"Permission denied while accessing performance stats");
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return -EPERM;
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} else if (rc == H_UNSUPPORTED) {
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dev_dbg(&p->pdev->dev, "Performance stats unsupported\n");
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return -EOPNOTSUPP;
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} else if (rc != H_SUCCESS) {
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dev_err(&p->pdev->dev,
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"Failed to query performance stats, Err:%lld\n", rc);
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return -EIO;
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} else if (!size) {
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/* Handle case where stat buffer size was requested */
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dev_dbg(&p->pdev->dev,
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"Performance stats size %ld\n", ret[0]);
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return ret[0];
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}
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/* Successfully fetched the requested stats from phyp */
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dev_dbg(&p->pdev->dev,
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"Performance stats returned %d stats\n",
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be32_to_cpu(buff_stats->num_statistics));
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return 0;
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}
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#ifdef CONFIG_PERF_EVENTS
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#define to_nvdimm_pmu(_pmu) container_of(_pmu, struct nvdimm_pmu, pmu)
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static int papr_scm_pmu_get_value(struct perf_event *event, struct device *dev, u64 *count)
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{
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struct papr_scm_perf_stat *stat;
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struct papr_scm_perf_stats *stats;
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struct papr_scm_priv *p = (struct papr_scm_priv *)dev->driver_data;
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int rc, size;
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/* Allocate request buffer enough to hold single performance stat */
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size = sizeof(struct papr_scm_perf_stats) +
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sizeof(struct papr_scm_perf_stat);
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if (!p || !p->nvdimm_events_map)
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return -EINVAL;
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stats = kzalloc(size, GFP_KERNEL);
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if (!stats)
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return -ENOMEM;
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stat = &stats->scm_statistic[0];
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memcpy(&stat->stat_id,
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&p->nvdimm_events_map[event->attr.config * sizeof(stat->stat_id)],
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sizeof(stat->stat_id));
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stat->stat_val = 0;
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rc = drc_pmem_query_stats(p, stats, 1);
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if (rc < 0) {
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kfree(stats);
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return rc;
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}
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*count = be64_to_cpu(stat->stat_val);
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kfree(stats);
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return 0;
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}
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static int papr_scm_pmu_event_init(struct perf_event *event)
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{
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struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
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struct papr_scm_priv *p;
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if (!nd_pmu)
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return -EINVAL;
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/* test the event attr type for PMU enumeration */
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if (event->attr.type != event->pmu->type)
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return -ENOENT;
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/* it does not support event sampling mode */
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if (is_sampling_event(event))
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return -EOPNOTSUPP;
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/* no branch sampling */
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if (has_branch_stack(event))
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return -EOPNOTSUPP;
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p = (struct papr_scm_priv *)nd_pmu->dev->driver_data;
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if (!p)
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return -EINVAL;
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/* Invalid eventcode */
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if (event->attr.config == 0 || event->attr.config > 16)
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return -EINVAL;
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return 0;
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}
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static int papr_scm_pmu_add(struct perf_event *event, int flags)
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{
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u64 count;
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int rc;
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struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
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if (!nd_pmu)
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return -EINVAL;
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if (flags & PERF_EF_START) {
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rc = papr_scm_pmu_get_value(event, nd_pmu->dev, &count);
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if (rc)
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return rc;
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local64_set(&event->hw.prev_count, count);
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}
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return 0;
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}
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static void papr_scm_pmu_read(struct perf_event *event)
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{
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u64 prev, now;
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int rc;
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struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
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if (!nd_pmu)
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return;
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rc = papr_scm_pmu_get_value(event, nd_pmu->dev, &now);
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if (rc)
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return;
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prev = local64_xchg(&event->hw.prev_count, now);
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local64_add(now - prev, &event->count);
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}
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static void papr_scm_pmu_del(struct perf_event *event, int flags)
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{
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papr_scm_pmu_read(event);
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}
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static int papr_scm_pmu_check_events(struct papr_scm_priv *p, struct nvdimm_pmu *nd_pmu)
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{
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struct papr_scm_perf_stat *stat;
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struct papr_scm_perf_stats *stats;
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u32 available_events;
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int index, rc = 0;
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if (!p->stat_buffer_len)
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return -ENOENT;
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available_events = (p->stat_buffer_len - sizeof(struct papr_scm_perf_stats))
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/ sizeof(struct papr_scm_perf_stat);
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if (available_events == 0)
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return -EOPNOTSUPP;
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/* Allocate the buffer for phyp where stats are written */
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stats = kzalloc(p->stat_buffer_len, GFP_KERNEL);
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if (!stats) {
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rc = -ENOMEM;
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return rc;
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}
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/* Called to get list of events supported */
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rc = drc_pmem_query_stats(p, stats, 0);
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if (rc)
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goto out;
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/*
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* Allocate memory and populate nvdimm_event_map.
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* Allocate an extra element for NULL entry
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*/
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p->nvdimm_events_map = kcalloc(available_events + 1,
|
|
sizeof(stat->stat_id),
|
|
GFP_KERNEL);
|
|
if (!p->nvdimm_events_map) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Copy all stat_ids to event map */
|
|
for (index = 0, stat = stats->scm_statistic;
|
|
index < available_events; index++, ++stat) {
|
|
memcpy(&p->nvdimm_events_map[index * sizeof(stat->stat_id)],
|
|
&stat->stat_id, sizeof(stat->stat_id));
|
|
}
|
|
out:
|
|
kfree(stats);
|
|
return rc;
|
|
}
|
|
|
|
static void papr_scm_pmu_register(struct papr_scm_priv *p)
|
|
{
|
|
struct nvdimm_pmu *nd_pmu;
|
|
int rc, nodeid;
|
|
|
|
nd_pmu = kzalloc(sizeof(*nd_pmu), GFP_KERNEL);
|
|
if (!nd_pmu) {
|
|
rc = -ENOMEM;
|
|
goto pmu_err_print;
|
|
}
|
|
|
|
rc = papr_scm_pmu_check_events(p, nd_pmu);
|
|
if (rc)
|
|
goto pmu_check_events_err;
|
|
|
|
nd_pmu->pmu.task_ctx_nr = perf_invalid_context;
|
|
nd_pmu->pmu.name = nvdimm_name(p->nvdimm);
|
|
nd_pmu->pmu.event_init = papr_scm_pmu_event_init;
|
|
nd_pmu->pmu.read = papr_scm_pmu_read;
|
|
nd_pmu->pmu.add = papr_scm_pmu_add;
|
|
nd_pmu->pmu.del = papr_scm_pmu_del;
|
|
|
|
nd_pmu->pmu.capabilities = PERF_PMU_CAP_NO_INTERRUPT |
|
|
PERF_PMU_CAP_NO_EXCLUDE;
|
|
|
|
/*updating the cpumask variable */
|
|
nodeid = numa_map_to_online_node(dev_to_node(&p->pdev->dev));
|
|
nd_pmu->arch_cpumask = *cpumask_of_node(nodeid);
|
|
|
|
rc = register_nvdimm_pmu(nd_pmu, p->pdev);
|
|
if (rc)
|
|
goto pmu_register_err;
|
|
|
|
/*
|
|
* Set archdata.priv value to nvdimm_pmu structure, to handle the
|
|
* unregistering of pmu device.
|
|
*/
|
|
p->pdev->archdata.priv = nd_pmu;
|
|
return;
|
|
|
|
pmu_register_err:
|
|
kfree(p->nvdimm_events_map);
|
|
pmu_check_events_err:
|
|
kfree(nd_pmu);
|
|
pmu_err_print:
|
|
dev_info(&p->pdev->dev, "nvdimm pmu didn't register rc=%d\n", rc);
|
|
}
|
|
|
|
#else
|
|
static void papr_scm_pmu_register(struct papr_scm_priv *p) { }
|
|
#endif
|
|
|
|
/*
|
|
* Issue hcall to retrieve dimm health info and populate papr_scm_priv with the
|
|
* health information.
|
|
*/
|
|
static int __drc_pmem_query_health(struct papr_scm_priv *p)
|
|
{
|
|
unsigned long ret[PLPAR_HCALL_BUFSIZE];
|
|
u64 bitmap = 0;
|
|
long rc;
|
|
|
|
/* issue the hcall */
|
|
rc = plpar_hcall(H_SCM_HEALTH, ret, p->drc_index);
|
|
if (rc == H_SUCCESS)
|
|
bitmap = ret[0] & ret[1];
|
|
else if (rc == H_FUNCTION)
|
|
dev_info_once(&p->pdev->dev,
|
|
"Hcall H_SCM_HEALTH not implemented, assuming empty health bitmap");
|
|
else {
|
|
|
|
dev_err(&p->pdev->dev,
|
|
"Failed to query health information, Err:%ld\n", rc);
|
|
return -ENXIO;
|
|
}
|
|
|
|
p->lasthealth_jiffies = jiffies;
|
|
/* Allow injecting specific health bits via inject mask. */
|
|
if (p->health_bitmap_inject_mask)
|
|
bitmap = (bitmap & ~p->health_bitmap_inject_mask) |
|
|
p->health_bitmap_inject_mask;
|
|
WRITE_ONCE(p->health_bitmap, bitmap);
|
|
dev_dbg(&p->pdev->dev,
|
|
"Queried dimm health info. Bitmap:0x%016lx Mask:0x%016lx\n",
|
|
ret[0], ret[1]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Min interval in seconds for assuming stable dimm health */
|
|
#define MIN_HEALTH_QUERY_INTERVAL 60
|
|
|
|
/* Query cached health info and if needed call drc_pmem_query_health */
|
|
static int drc_pmem_query_health(struct papr_scm_priv *p)
|
|
{
|
|
unsigned long cache_timeout;
|
|
int rc;
|
|
|
|
/* Protect concurrent modifications to papr_scm_priv */
|
|
rc = mutex_lock_interruptible(&p->health_mutex);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* Jiffies offset for which the health data is assumed to be same */
|
|
cache_timeout = p->lasthealth_jiffies +
|
|
msecs_to_jiffies(MIN_HEALTH_QUERY_INTERVAL * 1000);
|
|
|
|
/* Fetch new health info is its older than MIN_HEALTH_QUERY_INTERVAL */
|
|
if (time_after(jiffies, cache_timeout))
|
|
rc = __drc_pmem_query_health(p);
|
|
else
|
|
/* Assume cached health data is valid */
|
|
rc = 0;
|
|
|
|
mutex_unlock(&p->health_mutex);
|
|
return rc;
|
|
}
|
|
|
|
static int papr_scm_meta_get(struct papr_scm_priv *p,
|
|
struct nd_cmd_get_config_data_hdr *hdr)
|
|
{
|
|
unsigned long data[PLPAR_HCALL_BUFSIZE];
|
|
unsigned long offset, data_offset;
|
|
int len, read;
|
|
int64_t ret;
|
|
|
|
if ((hdr->in_offset + hdr->in_length) > p->metadata_size)
|
|
return -EINVAL;
|
|
|
|
for (len = hdr->in_length; len; len -= read) {
|
|
|
|
data_offset = hdr->in_length - len;
|
|
offset = hdr->in_offset + data_offset;
|
|
|
|
if (len >= 8)
|
|
read = 8;
|
|
else if (len >= 4)
|
|
read = 4;
|
|
else if (len >= 2)
|
|
read = 2;
|
|
else
|
|
read = 1;
|
|
|
|
ret = plpar_hcall(H_SCM_READ_METADATA, data, p->drc_index,
|
|
offset, read);
|
|
|
|
if (ret == H_PARAMETER) /* bad DRC index */
|
|
return -ENODEV;
|
|
if (ret)
|
|
return -EINVAL; /* other invalid parameter */
|
|
|
|
switch (read) {
|
|
case 8:
|
|
*(uint64_t *)(hdr->out_buf + data_offset) = be64_to_cpu(data[0]);
|
|
break;
|
|
case 4:
|
|
*(uint32_t *)(hdr->out_buf + data_offset) = be32_to_cpu(data[0] & 0xffffffff);
|
|
break;
|
|
|
|
case 2:
|
|
*(uint16_t *)(hdr->out_buf + data_offset) = be16_to_cpu(data[0] & 0xffff);
|
|
break;
|
|
|
|
case 1:
|
|
*(uint8_t *)(hdr->out_buf + data_offset) = (data[0] & 0xff);
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int papr_scm_meta_set(struct papr_scm_priv *p,
|
|
struct nd_cmd_set_config_hdr *hdr)
|
|
{
|
|
unsigned long offset, data_offset;
|
|
int len, wrote;
|
|
unsigned long data;
|
|
__be64 data_be;
|
|
int64_t ret;
|
|
|
|
if ((hdr->in_offset + hdr->in_length) > p->metadata_size)
|
|
return -EINVAL;
|
|
|
|
for (len = hdr->in_length; len; len -= wrote) {
|
|
|
|
data_offset = hdr->in_length - len;
|
|
offset = hdr->in_offset + data_offset;
|
|
|
|
if (len >= 8) {
|
|
data = *(uint64_t *)(hdr->in_buf + data_offset);
|
|
data_be = cpu_to_be64(data);
|
|
wrote = 8;
|
|
} else if (len >= 4) {
|
|
data = *(uint32_t *)(hdr->in_buf + data_offset);
|
|
data &= 0xffffffff;
|
|
data_be = cpu_to_be32(data);
|
|
wrote = 4;
|
|
} else if (len >= 2) {
|
|
data = *(uint16_t *)(hdr->in_buf + data_offset);
|
|
data &= 0xffff;
|
|
data_be = cpu_to_be16(data);
|
|
wrote = 2;
|
|
} else {
|
|
data_be = *(uint8_t *)(hdr->in_buf + data_offset);
|
|
data_be &= 0xff;
|
|
wrote = 1;
|
|
}
|
|
|
|
ret = plpar_hcall_norets(H_SCM_WRITE_METADATA, p->drc_index,
|
|
offset, data_be, wrote);
|
|
if (ret == H_PARAMETER) /* bad DRC index */
|
|
return -ENODEV;
|
|
if (ret)
|
|
return -EINVAL; /* other invalid parameter */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Do a sanity checks on the inputs args to dimm-control function and return
|
|
* '0' if valid. Validation of PDSM payloads happens later in
|
|
* papr_scm_service_pdsm.
|
|
*/
|
|
static int is_cmd_valid(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
|
|
unsigned int buf_len)
|
|
{
|
|
unsigned long cmd_mask = PAPR_SCM_DIMM_CMD_MASK;
|
|
struct nd_cmd_pkg *nd_cmd;
|
|
struct papr_scm_priv *p;
|
|
enum papr_pdsm pdsm;
|
|
|
|
/* Only dimm-specific calls are supported atm */
|
|
if (!nvdimm)
|
|
return -EINVAL;
|
|
|
|
/* get the provider data from struct nvdimm */
|
|
p = nvdimm_provider_data(nvdimm);
|
|
|
|
if (!test_bit(cmd, &cmd_mask)) {
|
|
dev_dbg(&p->pdev->dev, "Unsupported cmd=%u\n", cmd);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* For CMD_CALL verify pdsm request */
|
|
if (cmd == ND_CMD_CALL) {
|
|
/* Verify the envelope and envelop size */
|
|
if (!buf ||
|
|
buf_len < (sizeof(struct nd_cmd_pkg) + ND_PDSM_HDR_SIZE)) {
|
|
dev_dbg(&p->pdev->dev, "Invalid pkg size=%u\n",
|
|
buf_len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Verify that the nd_cmd_pkg.nd_family is correct */
|
|
nd_cmd = (struct nd_cmd_pkg *)buf;
|
|
|
|
if (nd_cmd->nd_family != NVDIMM_FAMILY_PAPR) {
|
|
dev_dbg(&p->pdev->dev, "Invalid pkg family=0x%llx\n",
|
|
nd_cmd->nd_family);
|
|
return -EINVAL;
|
|
}
|
|
|
|
pdsm = (enum papr_pdsm)nd_cmd->nd_command;
|
|
|
|
/* Verify if the pdsm command is valid */
|
|
if (pdsm <= PAPR_PDSM_MIN || pdsm >= PAPR_PDSM_MAX) {
|
|
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Invalid PDSM\n",
|
|
pdsm);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Have enough space to hold returned 'nd_pkg_pdsm' header */
|
|
if (nd_cmd->nd_size_out < ND_PDSM_HDR_SIZE) {
|
|
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Invalid payload\n",
|
|
pdsm);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/* Let the command be further processed */
|
|
return 0;
|
|
}
|
|
|
|
static int papr_pdsm_fuel_gauge(struct papr_scm_priv *p,
|
|
union nd_pdsm_payload *payload)
|
|
{
|
|
int rc, size;
|
|
u64 statval;
|
|
struct papr_scm_perf_stat *stat;
|
|
struct papr_scm_perf_stats *stats;
|
|
|
|
/* Silently fail if fetching performance metrics isn't supported */
|
|
if (!p->stat_buffer_len)
|
|
return 0;
|
|
|
|
/* Allocate request buffer enough to hold single performance stat */
|
|
size = sizeof(struct papr_scm_perf_stats) +
|
|
sizeof(struct papr_scm_perf_stat);
|
|
|
|
stats = kzalloc(size, GFP_KERNEL);
|
|
if (!stats)
|
|
return -ENOMEM;
|
|
|
|
stat = &stats->scm_statistic[0];
|
|
memcpy(&stat->stat_id, "MemLife ", sizeof(stat->stat_id));
|
|
stat->stat_val = 0;
|
|
|
|
/* Fetch the fuel gauge and populate it in payload */
|
|
rc = drc_pmem_query_stats(p, stats, 1);
|
|
if (rc < 0) {
|
|
dev_dbg(&p->pdev->dev, "Err(%d) fetching fuel gauge\n", rc);
|
|
goto free_stats;
|
|
}
|
|
|
|
statval = be64_to_cpu(stat->stat_val);
|
|
dev_dbg(&p->pdev->dev,
|
|
"Fetched fuel-gauge %llu", statval);
|
|
payload->health.extension_flags |=
|
|
PDSM_DIMM_HEALTH_RUN_GAUGE_VALID;
|
|
payload->health.dimm_fuel_gauge = statval;
|
|
|
|
rc = sizeof(struct nd_papr_pdsm_health);
|
|
|
|
free_stats:
|
|
kfree(stats);
|
|
return rc;
|
|
}
|
|
|
|
/* Add the dirty-shutdown-counter value to the pdsm */
|
|
static int papr_pdsm_dsc(struct papr_scm_priv *p,
|
|
union nd_pdsm_payload *payload)
|
|
{
|
|
payload->health.extension_flags |= PDSM_DIMM_DSC_VALID;
|
|
payload->health.dimm_dsc = p->dirty_shutdown_counter;
|
|
|
|
return sizeof(struct nd_papr_pdsm_health);
|
|
}
|
|
|
|
/* Fetch the DIMM health info and populate it in provided package. */
|
|
static int papr_pdsm_health(struct papr_scm_priv *p,
|
|
union nd_pdsm_payload *payload)
|
|
{
|
|
int rc;
|
|
|
|
/* Ensure dimm health mutex is taken preventing concurrent access */
|
|
rc = mutex_lock_interruptible(&p->health_mutex);
|
|
if (rc)
|
|
goto out;
|
|
|
|
/* Always fetch upto date dimm health data ignoring cached values */
|
|
rc = __drc_pmem_query_health(p);
|
|
if (rc) {
|
|
mutex_unlock(&p->health_mutex);
|
|
goto out;
|
|
}
|
|
|
|
/* update health struct with various flags derived from health bitmap */
|
|
payload->health = (struct nd_papr_pdsm_health) {
|
|
.extension_flags = 0,
|
|
.dimm_unarmed = !!(p->health_bitmap & PAPR_PMEM_UNARMED_MASK),
|
|
.dimm_bad_shutdown = !!(p->health_bitmap & PAPR_PMEM_BAD_SHUTDOWN_MASK),
|
|
.dimm_bad_restore = !!(p->health_bitmap & PAPR_PMEM_BAD_RESTORE_MASK),
|
|
.dimm_scrubbed = !!(p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED),
|
|
.dimm_locked = !!(p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED),
|
|
.dimm_encrypted = !!(p->health_bitmap & PAPR_PMEM_ENCRYPTED),
|
|
.dimm_health = PAPR_PDSM_DIMM_HEALTHY,
|
|
};
|
|
|
|
/* Update field dimm_health based on health_bitmap flags */
|
|
if (p->health_bitmap & PAPR_PMEM_HEALTH_FATAL)
|
|
payload->health.dimm_health = PAPR_PDSM_DIMM_FATAL;
|
|
else if (p->health_bitmap & PAPR_PMEM_HEALTH_CRITICAL)
|
|
payload->health.dimm_health = PAPR_PDSM_DIMM_CRITICAL;
|
|
else if (p->health_bitmap & PAPR_PMEM_HEALTH_UNHEALTHY)
|
|
payload->health.dimm_health = PAPR_PDSM_DIMM_UNHEALTHY;
|
|
|
|
/* struct populated hence can release the mutex now */
|
|
mutex_unlock(&p->health_mutex);
|
|
|
|
/* Populate the fuel gauge meter in the payload */
|
|
papr_pdsm_fuel_gauge(p, payload);
|
|
/* Populate the dirty-shutdown-counter field */
|
|
papr_pdsm_dsc(p, payload);
|
|
|
|
rc = sizeof(struct nd_papr_pdsm_health);
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/* Inject a smart error Add the dirty-shutdown-counter value to the pdsm */
|
|
static int papr_pdsm_smart_inject(struct papr_scm_priv *p,
|
|
union nd_pdsm_payload *payload)
|
|
{
|
|
int rc;
|
|
u32 supported_flags = 0;
|
|
u64 inject_mask = 0, clear_mask = 0;
|
|
u64 mask;
|
|
|
|
/* Check for individual smart error flags and update inject/clear masks */
|
|
if (payload->smart_inject.flags & PDSM_SMART_INJECT_HEALTH_FATAL) {
|
|
supported_flags |= PDSM_SMART_INJECT_HEALTH_FATAL;
|
|
if (payload->smart_inject.fatal_enable)
|
|
inject_mask |= PAPR_PMEM_HEALTH_FATAL;
|
|
else
|
|
clear_mask |= PAPR_PMEM_HEALTH_FATAL;
|
|
}
|
|
|
|
if (payload->smart_inject.flags & PDSM_SMART_INJECT_BAD_SHUTDOWN) {
|
|
supported_flags |= PDSM_SMART_INJECT_BAD_SHUTDOWN;
|
|
if (payload->smart_inject.unsafe_shutdown_enable)
|
|
inject_mask |= PAPR_PMEM_SHUTDOWN_DIRTY;
|
|
else
|
|
clear_mask |= PAPR_PMEM_SHUTDOWN_DIRTY;
|
|
}
|
|
|
|
dev_dbg(&p->pdev->dev, "[Smart-inject] inject_mask=%#llx clear_mask=%#llx\n",
|
|
inject_mask, clear_mask);
|
|
|
|
/* Prevent concurrent access to dimm health bitmap related members */
|
|
rc = mutex_lock_interruptible(&p->health_mutex);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* Use inject/clear masks to set health_bitmap_inject_mask */
|
|
mask = READ_ONCE(p->health_bitmap_inject_mask);
|
|
mask = (mask & ~clear_mask) | inject_mask;
|
|
WRITE_ONCE(p->health_bitmap_inject_mask, mask);
|
|
|
|
/* Invalidate cached health bitmap */
|
|
p->lasthealth_jiffies = 0;
|
|
|
|
mutex_unlock(&p->health_mutex);
|
|
|
|
/* Return the supported flags back to userspace */
|
|
payload->smart_inject.flags = supported_flags;
|
|
|
|
return sizeof(struct nd_papr_pdsm_health);
|
|
}
|
|
|
|
/*
|
|
* 'struct pdsm_cmd_desc'
|
|
* Identifies supported PDSMs' expected length of in/out payloads
|
|
* and pdsm service function.
|
|
*
|
|
* size_in : Size of input payload if any in the PDSM request.
|
|
* size_out : Size of output payload if any in the PDSM request.
|
|
* service : Service function for the PDSM request. Return semantics:
|
|
* rc < 0 : Error servicing PDSM and rc indicates the error.
|
|
* rc >=0 : Serviced successfully and 'rc' indicate number of
|
|
* bytes written to payload.
|
|
*/
|
|
struct pdsm_cmd_desc {
|
|
u32 size_in;
|
|
u32 size_out;
|
|
int (*service)(struct papr_scm_priv *dimm,
|
|
union nd_pdsm_payload *payload);
|
|
};
|
|
|
|
/* Holds all supported PDSMs' command descriptors */
|
|
static const struct pdsm_cmd_desc __pdsm_cmd_descriptors[] = {
|
|
[PAPR_PDSM_MIN] = {
|
|
.size_in = 0,
|
|
.size_out = 0,
|
|
.service = NULL,
|
|
},
|
|
/* New PDSM command descriptors to be added below */
|
|
|
|
[PAPR_PDSM_HEALTH] = {
|
|
.size_in = 0,
|
|
.size_out = sizeof(struct nd_papr_pdsm_health),
|
|
.service = papr_pdsm_health,
|
|
},
|
|
|
|
[PAPR_PDSM_SMART_INJECT] = {
|
|
.size_in = sizeof(struct nd_papr_pdsm_smart_inject),
|
|
.size_out = sizeof(struct nd_papr_pdsm_smart_inject),
|
|
.service = papr_pdsm_smart_inject,
|
|
},
|
|
/* Empty */
|
|
[PAPR_PDSM_MAX] = {
|
|
.size_in = 0,
|
|
.size_out = 0,
|
|
.service = NULL,
|
|
},
|
|
};
|
|
|
|
/* Given a valid pdsm cmd return its command descriptor else return NULL */
|
|
static inline const struct pdsm_cmd_desc *pdsm_cmd_desc(enum papr_pdsm cmd)
|
|
{
|
|
if (cmd >= 0 || cmd < ARRAY_SIZE(__pdsm_cmd_descriptors))
|
|
return &__pdsm_cmd_descriptors[cmd];
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* For a given pdsm request call an appropriate service function.
|
|
* Returns errors if any while handling the pdsm command package.
|
|
*/
|
|
static int papr_scm_service_pdsm(struct papr_scm_priv *p,
|
|
struct nd_cmd_pkg *pkg)
|
|
{
|
|
/* Get the PDSM header and PDSM command */
|
|
struct nd_pkg_pdsm *pdsm_pkg = (struct nd_pkg_pdsm *)pkg->nd_payload;
|
|
enum papr_pdsm pdsm = (enum papr_pdsm)pkg->nd_command;
|
|
const struct pdsm_cmd_desc *pdsc;
|
|
int rc;
|
|
|
|
/* Fetch corresponding pdsm descriptor for validation and servicing */
|
|
pdsc = pdsm_cmd_desc(pdsm);
|
|
|
|
/* Validate pdsm descriptor */
|
|
/* Ensure that reserved fields are 0 */
|
|
if (pdsm_pkg->reserved[0] || pdsm_pkg->reserved[1]) {
|
|
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Invalid reserved field\n",
|
|
pdsm);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* If pdsm expects some input, then ensure that the size_in matches */
|
|
if (pdsc->size_in &&
|
|
pkg->nd_size_in != (pdsc->size_in + ND_PDSM_HDR_SIZE)) {
|
|
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Mismatched size_in=%d\n",
|
|
pdsm, pkg->nd_size_in);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* If pdsm wants to return data, then ensure that size_out matches */
|
|
if (pdsc->size_out &&
|
|
pkg->nd_size_out != (pdsc->size_out + ND_PDSM_HDR_SIZE)) {
|
|
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Mismatched size_out=%d\n",
|
|
pdsm, pkg->nd_size_out);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Service the pdsm */
|
|
if (pdsc->service) {
|
|
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Servicing..\n", pdsm);
|
|
|
|
rc = pdsc->service(p, &pdsm_pkg->payload);
|
|
|
|
if (rc < 0) {
|
|
/* error encountered while servicing pdsm */
|
|
pdsm_pkg->cmd_status = rc;
|
|
pkg->nd_fw_size = ND_PDSM_HDR_SIZE;
|
|
} else {
|
|
/* pdsm serviced and 'rc' bytes written to payload */
|
|
pdsm_pkg->cmd_status = 0;
|
|
pkg->nd_fw_size = ND_PDSM_HDR_SIZE + rc;
|
|
}
|
|
} else {
|
|
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Unsupported PDSM request\n",
|
|
pdsm);
|
|
pdsm_pkg->cmd_status = -ENOENT;
|
|
pkg->nd_fw_size = ND_PDSM_HDR_SIZE;
|
|
}
|
|
|
|
return pdsm_pkg->cmd_status;
|
|
}
|
|
|
|
static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc,
|
|
struct nvdimm *nvdimm, unsigned int cmd, void *buf,
|
|
unsigned int buf_len, int *cmd_rc)
|
|
{
|
|
struct nd_cmd_get_config_size *get_size_hdr;
|
|
struct nd_cmd_pkg *call_pkg = NULL;
|
|
struct papr_scm_priv *p;
|
|
int rc;
|
|
|
|
rc = is_cmd_valid(nvdimm, cmd, buf, buf_len);
|
|
if (rc) {
|
|
pr_debug("Invalid cmd=0x%x. Err=%d\n", cmd, rc);
|
|
return rc;
|
|
}
|
|
|
|
/* Use a local variable in case cmd_rc pointer is NULL */
|
|
if (!cmd_rc)
|
|
cmd_rc = &rc;
|
|
|
|
p = nvdimm_provider_data(nvdimm);
|
|
|
|
switch (cmd) {
|
|
case ND_CMD_GET_CONFIG_SIZE:
|
|
get_size_hdr = buf;
|
|
|
|
get_size_hdr->status = 0;
|
|
get_size_hdr->max_xfer = 8;
|
|
get_size_hdr->config_size = p->metadata_size;
|
|
*cmd_rc = 0;
|
|
break;
|
|
|
|
case ND_CMD_GET_CONFIG_DATA:
|
|
*cmd_rc = papr_scm_meta_get(p, buf);
|
|
break;
|
|
|
|
case ND_CMD_SET_CONFIG_DATA:
|
|
*cmd_rc = papr_scm_meta_set(p, buf);
|
|
break;
|
|
|
|
case ND_CMD_CALL:
|
|
call_pkg = (struct nd_cmd_pkg *)buf;
|
|
*cmd_rc = papr_scm_service_pdsm(p, call_pkg);
|
|
break;
|
|
|
|
default:
|
|
dev_dbg(&p->pdev->dev, "Unknown command = %d\n", cmd);
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev_dbg(&p->pdev->dev, "returned with cmd_rc = %d\n", *cmd_rc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t health_bitmap_inject_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct nvdimm *dimm = to_nvdimm(dev);
|
|
struct papr_scm_priv *p = nvdimm_provider_data(dimm);
|
|
|
|
return sprintf(buf, "%#llx\n",
|
|
READ_ONCE(p->health_bitmap_inject_mask));
|
|
}
|
|
|
|
static DEVICE_ATTR_ADMIN_RO(health_bitmap_inject);
|
|
|
|
static ssize_t perf_stats_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
int index;
|
|
ssize_t rc;
|
|
struct seq_buf s;
|
|
struct papr_scm_perf_stat *stat;
|
|
struct papr_scm_perf_stats *stats;
|
|
struct nvdimm *dimm = to_nvdimm(dev);
|
|
struct papr_scm_priv *p = nvdimm_provider_data(dimm);
|
|
|
|
if (!p->stat_buffer_len)
|
|
return -ENOENT;
|
|
|
|
/* Allocate the buffer for phyp where stats are written */
|
|
stats = kzalloc(p->stat_buffer_len, GFP_KERNEL);
|
|
if (!stats)
|
|
return -ENOMEM;
|
|
|
|
/* Ask phyp to return all dimm perf stats */
|
|
rc = drc_pmem_query_stats(p, stats, 0);
|
|
if (rc)
|
|
goto free_stats;
|
|
/*
|
|
* Go through the returned output buffer and print stats and
|
|
* values. Since stat_id is essentially a char string of
|
|
* 8 bytes, simply use the string format specifier to print it.
|
|
*/
|
|
seq_buf_init(&s, buf, PAGE_SIZE);
|
|
for (index = 0, stat = stats->scm_statistic;
|
|
index < be32_to_cpu(stats->num_statistics);
|
|
++index, ++stat) {
|
|
seq_buf_printf(&s, "%.8s = 0x%016llX\n",
|
|
stat->stat_id,
|
|
be64_to_cpu(stat->stat_val));
|
|
}
|
|
|
|
free_stats:
|
|
kfree(stats);
|
|
return rc ? rc : (ssize_t)seq_buf_used(&s);
|
|
}
|
|
static DEVICE_ATTR_ADMIN_RO(perf_stats);
|
|
|
|
static ssize_t flags_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct nvdimm *dimm = to_nvdimm(dev);
|
|
struct papr_scm_priv *p = nvdimm_provider_data(dimm);
|
|
struct seq_buf s;
|
|
u64 health;
|
|
int rc;
|
|
|
|
rc = drc_pmem_query_health(p);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* Copy health_bitmap locally, check masks & update out buffer */
|
|
health = READ_ONCE(p->health_bitmap);
|
|
|
|
seq_buf_init(&s, buf, PAGE_SIZE);
|
|
if (health & PAPR_PMEM_UNARMED_MASK)
|
|
seq_buf_printf(&s, "not_armed ");
|
|
|
|
if (health & PAPR_PMEM_BAD_SHUTDOWN_MASK)
|
|
seq_buf_printf(&s, "flush_fail ");
|
|
|
|
if (health & PAPR_PMEM_BAD_RESTORE_MASK)
|
|
seq_buf_printf(&s, "restore_fail ");
|
|
|
|
if (health & PAPR_PMEM_ENCRYPTED)
|
|
seq_buf_printf(&s, "encrypted ");
|
|
|
|
if (health & PAPR_PMEM_SMART_EVENT_MASK)
|
|
seq_buf_printf(&s, "smart_notify ");
|
|
|
|
if (health & PAPR_PMEM_SCRUBBED_AND_LOCKED)
|
|
seq_buf_printf(&s, "scrubbed locked ");
|
|
|
|
if (seq_buf_used(&s))
|
|
seq_buf_printf(&s, "\n");
|
|
|
|
return seq_buf_used(&s);
|
|
}
|
|
DEVICE_ATTR_RO(flags);
|
|
|
|
static ssize_t dirty_shutdown_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct nvdimm *dimm = to_nvdimm(dev);
|
|
struct papr_scm_priv *p = nvdimm_provider_data(dimm);
|
|
|
|
return sysfs_emit(buf, "%llu\n", p->dirty_shutdown_counter);
|
|
}
|
|
DEVICE_ATTR_RO(dirty_shutdown);
|
|
|
|
static umode_t papr_nd_attribute_visible(struct kobject *kobj,
|
|
struct attribute *attr, int n)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
struct nvdimm *nvdimm = to_nvdimm(dev);
|
|
struct papr_scm_priv *p = nvdimm_provider_data(nvdimm);
|
|
|
|
/* For if perf-stats not available remove perf_stats sysfs */
|
|
if (attr == &dev_attr_perf_stats.attr && p->stat_buffer_len == 0)
|
|
return 0;
|
|
|
|
return attr->mode;
|
|
}
|
|
|
|
/* papr_scm specific dimm attributes */
|
|
static struct attribute *papr_nd_attributes[] = {
|
|
&dev_attr_flags.attr,
|
|
&dev_attr_perf_stats.attr,
|
|
&dev_attr_dirty_shutdown.attr,
|
|
&dev_attr_health_bitmap_inject.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group papr_nd_attribute_group = {
|
|
.name = "papr",
|
|
.is_visible = papr_nd_attribute_visible,
|
|
.attrs = papr_nd_attributes,
|
|
};
|
|
|
|
static const struct attribute_group *papr_nd_attr_groups[] = {
|
|
&papr_nd_attribute_group,
|
|
NULL,
|
|
};
|
|
|
|
static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
|
|
{
|
|
struct device *dev = &p->pdev->dev;
|
|
struct nd_mapping_desc mapping;
|
|
struct nd_region_desc ndr_desc;
|
|
unsigned long dimm_flags;
|
|
int target_nid, online_nid;
|
|
|
|
p->bus_desc.ndctl = papr_scm_ndctl;
|
|
p->bus_desc.module = THIS_MODULE;
|
|
p->bus_desc.of_node = p->pdev->dev.of_node;
|
|
p->bus_desc.provider_name = kstrdup(p->pdev->name, GFP_KERNEL);
|
|
|
|
/* Set the dimm command family mask to accept PDSMs */
|
|
set_bit(NVDIMM_FAMILY_PAPR, &p->bus_desc.dimm_family_mask);
|
|
|
|
if (!p->bus_desc.provider_name)
|
|
return -ENOMEM;
|
|
|
|
p->bus = nvdimm_bus_register(NULL, &p->bus_desc);
|
|
if (!p->bus) {
|
|
dev_err(dev, "Error creating nvdimm bus %pOF\n", p->dn);
|
|
kfree(p->bus_desc.provider_name);
|
|
return -ENXIO;
|
|
}
|
|
|
|
dimm_flags = 0;
|
|
set_bit(NDD_LABELING, &dimm_flags);
|
|
|
|
/*
|
|
* Check if the nvdimm is unarmed. No locking needed as we are still
|
|
* initializing. Ignore error encountered if any.
|
|
*/
|
|
__drc_pmem_query_health(p);
|
|
|
|
if (p->health_bitmap & PAPR_PMEM_UNARMED_MASK)
|
|
set_bit(NDD_UNARMED, &dimm_flags);
|
|
|
|
p->nvdimm = nvdimm_create(p->bus, p, papr_nd_attr_groups,
|
|
dimm_flags, PAPR_SCM_DIMM_CMD_MASK, 0, NULL);
|
|
if (!p->nvdimm) {
|
|
dev_err(dev, "Error creating DIMM object for %pOF\n", p->dn);
|
|
goto err;
|
|
}
|
|
|
|
if (nvdimm_bus_check_dimm_count(p->bus, 1))
|
|
goto err;
|
|
|
|
/* now add the region */
|
|
|
|
memset(&mapping, 0, sizeof(mapping));
|
|
mapping.nvdimm = p->nvdimm;
|
|
mapping.start = 0;
|
|
mapping.size = p->blocks * p->block_size; // XXX: potential overflow?
|
|
|
|
memset(&ndr_desc, 0, sizeof(ndr_desc));
|
|
target_nid = dev_to_node(&p->pdev->dev);
|
|
online_nid = numa_map_to_online_node(target_nid);
|
|
ndr_desc.numa_node = online_nid;
|
|
ndr_desc.target_node = target_nid;
|
|
ndr_desc.res = &p->res;
|
|
ndr_desc.of_node = p->dn;
|
|
ndr_desc.provider_data = p;
|
|
ndr_desc.mapping = &mapping;
|
|
ndr_desc.num_mappings = 1;
|
|
ndr_desc.nd_set = &p->nd_set;
|
|
|
|
if (p->hcall_flush_required) {
|
|
set_bit(ND_REGION_ASYNC, &ndr_desc.flags);
|
|
ndr_desc.flush = papr_scm_pmem_flush;
|
|
}
|
|
|
|
if (p->is_volatile)
|
|
p->region = nvdimm_volatile_region_create(p->bus, &ndr_desc);
|
|
else {
|
|
set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags);
|
|
p->region = nvdimm_pmem_region_create(p->bus, &ndr_desc);
|
|
}
|
|
if (!p->region) {
|
|
dev_err(dev, "Error registering region %pR from %pOF\n",
|
|
ndr_desc.res, p->dn);
|
|
goto err;
|
|
}
|
|
if (target_nid != online_nid)
|
|
dev_info(dev, "Region registered with target node %d and online node %d",
|
|
target_nid, online_nid);
|
|
|
|
mutex_lock(&papr_ndr_lock);
|
|
list_add_tail(&p->region_list, &papr_nd_regions);
|
|
mutex_unlock(&papr_ndr_lock);
|
|
|
|
return 0;
|
|
|
|
err: nvdimm_bus_unregister(p->bus);
|
|
kfree(p->bus_desc.provider_name);
|
|
return -ENXIO;
|
|
}
|
|
|
|
static void papr_scm_add_badblock(struct nd_region *region,
|
|
struct nvdimm_bus *bus, u64 phys_addr)
|
|
{
|
|
u64 aligned_addr = ALIGN_DOWN(phys_addr, L1_CACHE_BYTES);
|
|
|
|
if (nvdimm_bus_add_badrange(bus, aligned_addr, L1_CACHE_BYTES)) {
|
|
pr_err("Bad block registration for 0x%llx failed\n", phys_addr);
|
|
return;
|
|
}
|
|
|
|
pr_debug("Add memory range (0x%llx - 0x%llx) as bad range\n",
|
|
aligned_addr, aligned_addr + L1_CACHE_BYTES);
|
|
|
|
nvdimm_region_notify(region, NVDIMM_REVALIDATE_POISON);
|
|
}
|
|
|
|
static int handle_mce_ue(struct notifier_block *nb, unsigned long val,
|
|
void *data)
|
|
{
|
|
struct machine_check_event *evt = data;
|
|
struct papr_scm_priv *p;
|
|
u64 phys_addr;
|
|
bool found = false;
|
|
|
|
if (evt->error_type != MCE_ERROR_TYPE_UE)
|
|
return NOTIFY_DONE;
|
|
|
|
if (list_empty(&papr_nd_regions))
|
|
return NOTIFY_DONE;
|
|
|
|
/*
|
|
* The physical address obtained here is PAGE_SIZE aligned, so get the
|
|
* exact address from the effective address
|
|
*/
|
|
phys_addr = evt->u.ue_error.physical_address +
|
|
(evt->u.ue_error.effective_address & ~PAGE_MASK);
|
|
|
|
if (!evt->u.ue_error.physical_address_provided ||
|
|
!is_zone_device_page(pfn_to_page(phys_addr >> PAGE_SHIFT)))
|
|
return NOTIFY_DONE;
|
|
|
|
/* mce notifier is called from a process context, so mutex is safe */
|
|
mutex_lock(&papr_ndr_lock);
|
|
list_for_each_entry(p, &papr_nd_regions, region_list) {
|
|
if (phys_addr >= p->res.start && phys_addr <= p->res.end) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found)
|
|
papr_scm_add_badblock(p->region, p->bus, phys_addr);
|
|
|
|
mutex_unlock(&papr_ndr_lock);
|
|
|
|
return found ? NOTIFY_OK : NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block mce_ue_nb = {
|
|
.notifier_call = handle_mce_ue
|
|
};
|
|
|
|
static int papr_scm_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *dn = pdev->dev.of_node;
|
|
u32 drc_index, metadata_size;
|
|
u64 blocks, block_size;
|
|
struct papr_scm_priv *p;
|
|
u8 uuid_raw[UUID_SIZE];
|
|
const char *uuid_str;
|
|
ssize_t stat_size;
|
|
uuid_t uuid;
|
|
int rc;
|
|
|
|
/* check we have all the required DT properties */
|
|
if (of_property_read_u32(dn, "ibm,my-drc-index", &drc_index)) {
|
|
dev_err(&pdev->dev, "%pOF: missing drc-index!\n", dn);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (of_property_read_u64(dn, "ibm,block-size", &block_size)) {
|
|
dev_err(&pdev->dev, "%pOF: missing block-size!\n", dn);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (of_property_read_u64(dn, "ibm,number-of-blocks", &blocks)) {
|
|
dev_err(&pdev->dev, "%pOF: missing number-of-blocks!\n", dn);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (of_property_read_string(dn, "ibm,unit-guid", &uuid_str)) {
|
|
dev_err(&pdev->dev, "%pOF: missing unit-guid!\n", dn);
|
|
return -ENODEV;
|
|
}
|
|
|
|
|
|
p = kzalloc(sizeof(*p), GFP_KERNEL);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
/* Initialize the dimm mutex */
|
|
mutex_init(&p->health_mutex);
|
|
|
|
/* optional DT properties */
|
|
of_property_read_u32(dn, "ibm,metadata-size", &metadata_size);
|
|
|
|
p->dn = dn;
|
|
p->drc_index = drc_index;
|
|
p->block_size = block_size;
|
|
p->blocks = blocks;
|
|
p->is_volatile = !of_property_read_bool(dn, "ibm,cache-flush-required");
|
|
p->hcall_flush_required = of_property_read_bool(dn, "ibm,hcall-flush-required");
|
|
|
|
if (of_property_read_u64(dn, "ibm,persistence-failed-count",
|
|
&p->dirty_shutdown_counter))
|
|
p->dirty_shutdown_counter = 0;
|
|
|
|
/* We just need to ensure that set cookies are unique across */
|
|
uuid_parse(uuid_str, &uuid);
|
|
|
|
/*
|
|
* The cookie1 and cookie2 are not really little endian.
|
|
* We store a raw buffer representation of the
|
|
* uuid string so that we can compare this with the label
|
|
* area cookie irrespective of the endian configuration
|
|
* with which the kernel is built.
|
|
*
|
|
* Historically we stored the cookie in the below format.
|
|
* for a uuid string 72511b67-0b3b-42fd-8d1d-5be3cae8bcaa
|
|
* cookie1 was 0xfd423b0b671b5172
|
|
* cookie2 was 0xaabce8cae35b1d8d
|
|
*/
|
|
export_uuid(uuid_raw, &uuid);
|
|
p->nd_set.cookie1 = get_unaligned_le64(&uuid_raw[0]);
|
|
p->nd_set.cookie2 = get_unaligned_le64(&uuid_raw[8]);
|
|
|
|
/* might be zero */
|
|
p->metadata_size = metadata_size;
|
|
p->pdev = pdev;
|
|
|
|
/* request the hypervisor to bind this region to somewhere in memory */
|
|
rc = drc_pmem_bind(p);
|
|
|
|
/* If phyp says drc memory still bound then force unbound and retry */
|
|
if (rc == H_OVERLAP)
|
|
rc = drc_pmem_query_n_bind(p);
|
|
|
|
if (rc != H_SUCCESS) {
|
|
dev_err(&p->pdev->dev, "bind err: %d\n", rc);
|
|
rc = -ENXIO;
|
|
goto err;
|
|
}
|
|
|
|
/* setup the resource for the newly bound range */
|
|
p->res.start = p->bound_addr;
|
|
p->res.end = p->bound_addr + p->blocks * p->block_size - 1;
|
|
p->res.name = pdev->name;
|
|
p->res.flags = IORESOURCE_MEM;
|
|
|
|
/* Try retrieving the stat buffer and see if its supported */
|
|
stat_size = drc_pmem_query_stats(p, NULL, 0);
|
|
if (stat_size > 0) {
|
|
p->stat_buffer_len = stat_size;
|
|
dev_dbg(&p->pdev->dev, "Max perf-stat size %lu-bytes\n",
|
|
p->stat_buffer_len);
|
|
}
|
|
|
|
rc = papr_scm_nvdimm_init(p);
|
|
if (rc)
|
|
goto err2;
|
|
|
|
platform_set_drvdata(pdev, p);
|
|
papr_scm_pmu_register(p);
|
|
|
|
return 0;
|
|
|
|
err2: drc_pmem_unbind(p);
|
|
err: kfree(p);
|
|
return rc;
|
|
}
|
|
|
|
static int papr_scm_remove(struct platform_device *pdev)
|
|
{
|
|
struct papr_scm_priv *p = platform_get_drvdata(pdev);
|
|
|
|
mutex_lock(&papr_ndr_lock);
|
|
list_del(&p->region_list);
|
|
mutex_unlock(&papr_ndr_lock);
|
|
|
|
nvdimm_bus_unregister(p->bus);
|
|
drc_pmem_unbind(p);
|
|
|
|
if (pdev->archdata.priv)
|
|
unregister_nvdimm_pmu(pdev->archdata.priv);
|
|
|
|
pdev->archdata.priv = NULL;
|
|
kfree(p->nvdimm_events_map);
|
|
kfree(p->bus_desc.provider_name);
|
|
kfree(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id papr_scm_match[] = {
|
|
{ .compatible = "ibm,pmemory" },
|
|
{ .compatible = "ibm,pmemory-v2" },
|
|
{ },
|
|
};
|
|
|
|
static struct platform_driver papr_scm_driver = {
|
|
.probe = papr_scm_probe,
|
|
.remove = papr_scm_remove,
|
|
.driver = {
|
|
.name = "papr_scm",
|
|
.of_match_table = papr_scm_match,
|
|
},
|
|
};
|
|
|
|
static int __init papr_scm_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = platform_driver_register(&papr_scm_driver);
|
|
if (!ret)
|
|
mce_register_notifier(&mce_ue_nb);
|
|
|
|
return ret;
|
|
}
|
|
module_init(papr_scm_init);
|
|
|
|
static void __exit papr_scm_exit(void)
|
|
{
|
|
mce_unregister_notifier(&mce_ue_nb);
|
|
platform_driver_unregister(&papr_scm_driver);
|
|
}
|
|
module_exit(papr_scm_exit);
|
|
|
|
MODULE_DEVICE_TABLE(of, papr_scm_match);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("IBM Corporation");
|