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1299 lines
34 KiB
1299 lines
34 KiB
// 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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#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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}; |
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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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/* |
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* Issue hcall to retrieve dimm health info and populate papr_scm_priv with the |
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* health information. |
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*/ |
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static int __drc_pmem_query_health(struct papr_scm_priv *p) |
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{ |
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unsigned long ret[PLPAR_HCALL_BUFSIZE]; |
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long rc; |
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/* issue the hcall */ |
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rc = plpar_hcall(H_SCM_HEALTH, ret, p->drc_index); |
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if (rc != H_SUCCESS) { |
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dev_err(&p->pdev->dev, |
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"Failed to query health information, Err:%ld\n", rc); |
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return -ENXIO; |
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} |
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p->lasthealth_jiffies = jiffies; |
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p->health_bitmap = ret[0] & ret[1]; |
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dev_dbg(&p->pdev->dev, |
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"Queried dimm health info. Bitmap:0x%016lx Mask:0x%016lx\n", |
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ret[0], ret[1]); |
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return 0; |
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} |
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/* Min interval in seconds for assuming stable dimm health */ |
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#define MIN_HEALTH_QUERY_INTERVAL 60 |
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/* Query cached health info and if needed call drc_pmem_query_health */ |
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static int drc_pmem_query_health(struct papr_scm_priv *p) |
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{ |
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unsigned long cache_timeout; |
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int rc; |
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/* Protect concurrent modifications to papr_scm_priv */ |
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rc = mutex_lock_interruptible(&p->health_mutex); |
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if (rc) |
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return rc; |
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/* Jiffies offset for which the health data is assumed to be same */ |
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cache_timeout = p->lasthealth_jiffies + |
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msecs_to_jiffies(MIN_HEALTH_QUERY_INTERVAL * 1000); |
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/* Fetch new health info is its older than MIN_HEALTH_QUERY_INTERVAL */ |
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if (time_after(jiffies, cache_timeout)) |
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rc = __drc_pmem_query_health(p); |
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else |
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/* Assume cached health data is valid */ |
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rc = 0; |
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mutex_unlock(&p->health_mutex); |
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return rc; |
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} |
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static int papr_scm_meta_get(struct papr_scm_priv *p, |
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struct nd_cmd_get_config_data_hdr *hdr) |
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{ |
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unsigned long data[PLPAR_HCALL_BUFSIZE]; |
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unsigned long offset, data_offset; |
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int len, read; |
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int64_t ret; |
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if ((hdr->in_offset + hdr->in_length) > p->metadata_size) |
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return -EINVAL; |
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for (len = hdr->in_length; len; len -= read) { |
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data_offset = hdr->in_length - len; |
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offset = hdr->in_offset + data_offset; |
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if (len >= 8) |
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read = 8; |
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else if (len >= 4) |
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read = 4; |
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else if (len >= 2) |
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read = 2; |
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else |
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read = 1; |
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ret = plpar_hcall(H_SCM_READ_METADATA, data, p->drc_index, |
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offset, read); |
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if (ret == H_PARAMETER) /* bad DRC index */ |
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return -ENODEV; |
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if (ret) |
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return -EINVAL; /* other invalid parameter */ |
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switch (read) { |
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case 8: |
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*(uint64_t *)(hdr->out_buf + data_offset) = be64_to_cpu(data[0]); |
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break; |
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case 4: |
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*(uint32_t *)(hdr->out_buf + data_offset) = be32_to_cpu(data[0] & 0xffffffff); |
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break; |
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case 2: |
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*(uint16_t *)(hdr->out_buf + data_offset) = be16_to_cpu(data[0] & 0xffff); |
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break; |
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case 1: |
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*(uint8_t *)(hdr->out_buf + data_offset) = (data[0] & 0xff); |
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break; |
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} |
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} |
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return 0; |
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} |
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|
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static int papr_scm_meta_set(struct papr_scm_priv *p, |
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struct nd_cmd_set_config_hdr *hdr) |
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{ |
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unsigned long offset, data_offset; |
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int len, wrote; |
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unsigned long data; |
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__be64 data_be; |
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int64_t ret; |
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|
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if ((hdr->in_offset + hdr->in_length) > p->metadata_size) |
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return -EINVAL; |
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for (len = hdr->in_length; len; len -= wrote) { |
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|
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data_offset = hdr->in_length - len; |
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offset = hdr->in_offset + data_offset; |
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|
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if (len >= 8) { |
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data = *(uint64_t *)(hdr->in_buf + data_offset); |
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data_be = cpu_to_be64(data); |
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wrote = 8; |
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} else if (len >= 4) { |
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data = *(uint32_t *)(hdr->in_buf + data_offset); |
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data &= 0xffffffff; |
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data_be = cpu_to_be32(data); |
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wrote = 4; |
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} else if (len >= 2) { |
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data = *(uint16_t *)(hdr->in_buf + data_offset); |
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data &= 0xffff; |
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data_be = cpu_to_be16(data); |
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wrote = 2; |
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} else { |
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data_be = *(uint8_t *)(hdr->in_buf + data_offset); |
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data_be &= 0xff; |
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wrote = 1; |
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} |
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|
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ret = plpar_hcall_norets(H_SCM_WRITE_METADATA, p->drc_index, |
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offset, data_be, wrote); |
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if (ret == H_PARAMETER) /* bad DRC index */ |
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return -ENODEV; |
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if (ret) |
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return -EINVAL; /* other invalid parameter */ |
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} |
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|
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return 0; |
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} |
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|
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/* |
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* Do a sanity checks on the inputs args to dimm-control function and return |
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* '0' if valid. Validation of PDSM payloads happens later in |
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* papr_scm_service_pdsm. |
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*/ |
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static int is_cmd_valid(struct nvdimm *nvdimm, unsigned int cmd, void *buf, |
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unsigned int buf_len) |
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{ |
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unsigned long cmd_mask = PAPR_SCM_DIMM_CMD_MASK; |
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struct nd_cmd_pkg *nd_cmd; |
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struct papr_scm_priv *p; |
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enum papr_pdsm pdsm; |
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|
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/* Only dimm-specific calls are supported atm */ |
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if (!nvdimm) |
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return -EINVAL; |
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|
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/* get the provider data from struct nvdimm */ |
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p = nvdimm_provider_data(nvdimm); |
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|
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if (!test_bit(cmd, &cmd_mask)) { |
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dev_dbg(&p->pdev->dev, "Unsupported cmd=%u\n", cmd); |
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return -EINVAL; |
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} |
|
|
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/* For CMD_CALL verify pdsm request */ |
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if (cmd == ND_CMD_CALL) { |
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/* Verify the envelope and envelop size */ |
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if (!buf || |
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buf_len < (sizeof(struct nd_cmd_pkg) + ND_PDSM_HDR_SIZE)) { |
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dev_dbg(&p->pdev->dev, "Invalid pkg size=%u\n", |
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buf_len); |
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return -EINVAL; |
|
} |
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|
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/* Verify that the nd_cmd_pkg.nd_family is correct */ |
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nd_cmd = (struct nd_cmd_pkg *)buf; |
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|
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if (nd_cmd->nd_family != NVDIMM_FAMILY_PAPR) { |
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dev_dbg(&p->pdev->dev, "Invalid pkg family=0x%llx\n", |
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nd_cmd->nd_family); |
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return -EINVAL; |
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} |
|
|
|
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; |
|
} |
|
|
|
/* |
|
* '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, |
|
}, |
|
/* 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 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, |
|
NULL, |
|
}; |
|
|
|
static 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); |
|
|
|
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); |
|
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");
|
|
|