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Here are the already implemented approaches: 1. Fixed zero id. The vast majority of the drivers expect to have a single memory controller in the system. 2. Calculate based on a platform-specific way (Pre-defined devices order, PCIe-bus address, Numa node ID + PCIe-function number, etc). 3. Use platform_device->id. 4. Use custom ACPI/OF property value. 5. Use locally maintained static MC counter. Create a generic method of the MC index allocation which could be utilized for the case 5 (it doesn't imply any strict memory controller order) and which would prevent the new MC EDAC drivers re-implementing the approaches 3 and 4. Moreover it will be useful for the cases when a platform is equipped with memory-controllers of different types [1] and which are probed by different drivers [2]. [1] Link: https://lore.kernel.org/all/9dc2a947-d2ab-4f00-8ed3-d2499cb6fdfd@BN1BFFO11FD002.protection.gbl/ [2] Link: https://lore.kernel.org/linux-edac/BY5PR12MB4258CB67B70D71F107EC1E9DDB3E9@BY5PR12MB4258.namprd12.prod.outlook.com The suggested implementation is based on the IDA kernel API and implies the next semantics: 1. If a particular MC index is specified it will be registered in the IDR pool unless the specified ID has already been reserved. 2. If a special MC index is specified (EDAC_AUTO_MC_NUM) the EDAC core will check whether there is a "mcID" alias is defined in the device tree and use the ID from there if it's found. 3. Otherwise a next free index will be allocated and assigned to the registered memory controller. Signed-off-by: Serge Semin --- Note the approach implemented here has been partly ported from the SPI core driver using IDA to track/allocate SPI bus numbers. Link: https://elixir.bootlin.com/linux/latest/source/drivers/spi/spi.c#L2957 --- drivers/edac/edac_mc.c | 89 +++++++++++++++++++++++++++++++++++++++--- drivers/edac/edac_mc.h | 4 ++ 2 files changed, 87 insertions(+), 6 deletions(-) diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c index c0b36349999f..2144e0615679 100644 --- a/drivers/edac/edac_mc.c +++ b/drivers/edac/edac_mc.c @@ -29,6 +29,9 @@ #include #include #include +#include +#include + #include #include "edac_mc.h" #include "edac_module.h" @@ -46,6 +49,7 @@ EXPORT_SYMBOL_GPL(edac_op_state); /* lock to memory controller's control array */ static DEFINE_MUTEX(mem_ctls_mutex); static LIST_HEAD(mc_devices); +static DEFINE_IDR(mc_idr); /* * Used to lock EDAC MC to just one module, avoiding two drivers e. g. @@ -494,7 +498,64 @@ void edac_mc_reset_delay_period(unsigned long value) mutex_unlock(&mem_ctls_mutex); } +/** + * edac_mc_alloc_id() - Allocate unique Memory Controller identifier + * + * @mci: pointer to the mci structure to allocate ID for + * + * Use edac_mc_free_id() to coherently free the MC identifier. + * + * .. note:: + * locking model: must be called with the mem_ctls_mutex lock held + * + * Returns: + * 0 on Success, or an error code on failure + */ +static int edac_mc_alloc_id(struct mem_ctl_info *mci) +{ + struct device_node *np = dev_of_node(mci->pdev); + int ret, min, max; + + if (mci->mc_idx == EDAC_AUTO_MC_NUM) { + ret = of_alias_get_id(np, "mc"); + if (ret >= 0) { + min = ret; + max = ret + 1; + } else { + min = of_alias_get_highest_id("mc"); + if (min >= 0) + min++; + else + min = 0; + + max = 0; + } + } else { + min = mci->mc_idx; + max = mci->mc_idx + 1; + } + + ret = idr_alloc(&mc_idr, mci, min, max, GFP_KERNEL); + if (ret < 0) + return ret == -ENOSPC ? -EBUSY : ret; + + mci->mc_idx = ret; + + return 0; +} +/** + * edac_mc_free_id() - Free Memory Controller identifier + * + * @mci: pointer to the mci structure to free ID from + * + * .. note:: + * locking model: must be called with the mem_ctls_mutex lock held + */ +static void edac_mc_free_id(struct mem_ctl_info *mci) +{ + idr_remove(&mc_idr, mci->mc_idx); +} /** * edac_mc_init_labels() - Initialize DIMM labels @@ -613,7 +674,8 @@ EXPORT_SYMBOL_GPL(edac_get_owner); int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci, const struct attribute_group **groups) { - int ret = -EINVAL; + int ret; + edac_dbg(0, "\n"); #ifdef CONFIG_EDAC_DEBUG @@ -650,20 +712,30 @@ int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci, goto fail0; } + ret = edac_mc_alloc_id(mci); + if (ret) { + edac_printk(KERN_ERR, EDAC_MC, "failed to allocate MC idx %u\n", + mci->mc_idx); + goto fail0; + } + edac_mc_init_labels(mci); - if (add_mc_to_global_list(mci)) - goto fail0; + if (add_mc_to_global_list(mci)) { + ret = -EINVAL; + goto fail1; + } /* set load time so that error rate can be tracked */ mci->start_time = jiffies; mci->bus = edac_get_sysfs_subsys(); - if (edac_create_sysfs_mci_device(mci, groups)) { + ret = edac_create_sysfs_mci_device(mci, groups); + if (ret) { edac_mc_printk(mci, KERN_WARNING, "failed to create sysfs device\n"); - goto fail1; + goto fail2; } if (mci->edac_check) { @@ -687,9 +759,12 @@ int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci, mutex_unlock(&mem_ctls_mutex); return 0; -fail1: +fail2: del_mc_from_global_list(mci); +fail1: + edac_mc_free_id(mci); + fail0: mutex_unlock(&mem_ctls_mutex); return ret; @@ -717,6 +792,8 @@ struct mem_ctl_info *edac_mc_del_mc(struct device *dev) if (del_mc_from_global_list(mci)) edac_mc_owner = NULL; + edac_mc_free_id(mci); + mutex_unlock(&mem_ctls_mutex); if (mci->edac_check) diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h index 881b00eadf7a..4b6676235b1b 100644 --- a/drivers/edac/edac_mc.h +++ b/drivers/edac/edac_mc.h @@ -23,6 +23,7 @@ #define _EDAC_MC_H_ #include +#include #include #include #include @@ -37,6 +38,9 @@ #include #include +/* Generate MC identifier automatically */ +#define EDAC_AUTO_MC_NUM UINT_MAX + #if PAGE_SHIFT < 20 #define PAGES_TO_MiB(pages) ((pages) >> (20 - PAGE_SHIFT)) #define MiB_TO_PAGES(mb) ((mb) << (20 - PAGE_SHIFT))