On Mon, May 04, 2026 at 08:57:34PM +0200, Casey Connolly wrote: > Import the SMEM driver from Linux.
Linux v6.11-rc2 seems quite old, can we rather just sync from v7.1-rc2 directly? -Sumit > > Signed-off-by: Casey Connolly <[email protected]> > --- > drivers/soc/qcom/smem.c | 1279 > ++++++++++++++++++++++++++++++++++++++++++++ > include/soc/qcom/smem.h | 20 + > include/soc/qcom/socinfo.h | 111 ++++ > 3 files changed, 1410 insertions(+) > > diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c > new file mode 100644 > index 000000000000..8515b8ae7777 > --- /dev/null > +++ b/drivers/soc/qcom/smem.c > @@ -0,0 +1,1279 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (c) 2015, Sony Mobile Communications AB. > + * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. > + */ > + > +#include <linux/hwspinlock.h> > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_address.h> > +#include <linux/of_reserved_mem.h> > +#include <linux/platform_device.h> > +#include <linux/sizes.h> > +#include <linux/slab.h> > +#include <linux/soc/qcom/smem.h> > +#include <linux/soc/qcom/socinfo.h> > + > +/* > + * The Qualcomm shared memory system is a allocate only heap structure that > + * consists of one of more memory areas that can be accessed by the > processors > + * in the SoC. > + * > + * All systems contains a global heap, accessible by all processors in the > SoC, > + * with a table of contents data structure (@smem_header) at the beginning of > + * the main shared memory block. > + * > + * The global header contains meta data for allocations as well as a fixed > list > + * of 512 entries (@smem_global_entry) that can be initialized to reference > + * parts of the shared memory space. > + * > + * > + * In addition to this global heap a set of "private" heaps can be set up at > + * boot time with access restrictions so that only certain processor pairs > can > + * access the data. > + * > + * These partitions are referenced from an optional partition table > + * (@smem_ptable), that is found 4kB from the end of the main smem region. > The > + * partition table entries (@smem_ptable_entry) lists the involved processors > + * (or hosts) and their location in the main shared memory region. > + * > + * Each partition starts with a header (@smem_partition_header) that > identifies > + * the partition and holds properties for the two internal memory regions. > The > + * two regions are cached and non-cached memory respectively. Each region > + * contain a link list of allocation headers (@smem_private_entry) followed > by > + * their data. > + * > + * Items in the non-cached region are allocated from the start of the > partition > + * while items in the cached region are allocated from the end. The free area > + * is hence the region between the cached and non-cached offsets. The header > of > + * cached items comes after the data. > + * > + * Version 12 (SMEM_GLOBAL_PART_VERSION) changes the item alloc/get procedure > + * for the global heap. A new global partition is created from the global > heap > + * region with partition type (SMEM_GLOBAL_HOST) and the max smem item count > is > + * set by the bootloader. > + * > + * To synchronize allocations in the shared memory heaps a remote spinlock > must > + * be held - currently lock number 3 of the sfpb or tcsr is used for this on > all > + * platforms. > + * > + */ > + > +/* > + * The version member of the smem header contains an array of versions for > the > + * various software components in the SoC. We verify that the boot loader > + * version is a valid version as a sanity check. > + */ > +#define SMEM_MASTER_SBL_VERSION_INDEX 7 > +#define SMEM_GLOBAL_HEAP_VERSION 11 > +#define SMEM_GLOBAL_PART_VERSION 12 > + > +/* > + * The first 8 items are only to be allocated by the boot loader while > + * initializing the heap. > + */ > +#define SMEM_ITEM_LAST_FIXED 8 > + > +/* Highest accepted item number, for both global and private heaps */ > +#define SMEM_ITEM_COUNT 512 > + > +/* Processor/host identifier for the application processor */ > +#define SMEM_HOST_APPS 0 > + > +/* Processor/host identifier for the global partition */ > +#define SMEM_GLOBAL_HOST 0xfffe > + > +/* Max number of processors/hosts in a system */ > +#define SMEM_HOST_COUNT 20 > + > +/** > + * struct smem_proc_comm - proc_comm communication struct (legacy) > + * @command: current command to be executed > + * @status: status of the currently requested command > + * @params: parameters to the command > + */ > +struct smem_proc_comm { > + __le32 command; > + __le32 status; > + __le32 params[2]; > +}; > + > +/** > + * struct smem_global_entry - entry to reference smem items on the heap > + * @allocated: boolean to indicate if this entry is used > + * @offset: offset to the allocated space > + * @size: size of the allocated space, 8 byte aligned > + * @aux_base: base address for the memory region used by this unit, > or 0 for > + * the default region. bits 0,1 are reserved > + */ > +struct smem_global_entry { > + __le32 allocated; > + __le32 offset; > + __le32 size; > + __le32 aux_base; /* bits 1:0 reserved */ > +}; > +#define AUX_BASE_MASK 0xfffffffc > + > +/** > + * struct smem_header - header found in beginning of primary smem region > + * @proc_comm: proc_comm communication interface (legacy) > + * @version: array of versions for the various subsystems > + * @initialized: boolean to indicate that smem is initialized > + * @free_offset: index of the first unallocated byte in smem > + * @available: number of bytes available for allocation > + * @reserved: reserved field, must be 0 > + * @toc: array of references to items > + */ > +struct smem_header { > + struct smem_proc_comm proc_comm[4]; > + __le32 version[32]; > + __le32 initialized; > + __le32 free_offset; > + __le32 available; > + __le32 reserved; > + struct smem_global_entry toc[SMEM_ITEM_COUNT]; > +}; > + > +/** > + * struct smem_ptable_entry - one entry in the @smem_ptable list > + * @offset: offset, within the main shared memory region, of the partition > + * @size: size of the partition > + * @flags: flags for the partition (currently unused) > + * @host0: first processor/host with access to this partition > + * @host1: second processor/host with access to this partition > + * @cacheline: alignment for "cached" entries > + * @reserved: reserved entries for later use > + */ > +struct smem_ptable_entry { > + __le32 offset; > + __le32 size; > + __le32 flags; > + __le16 host0; > + __le16 host1; > + __le32 cacheline; > + __le32 reserved[7]; > +}; > + > +/** > + * struct smem_ptable - partition table for the private partitions > + * @magic: magic number, must be SMEM_PTABLE_MAGIC > + * @version: version of the partition table > + * @num_entries: number of partitions in the table > + * @reserved: for now reserved entries > + * @entry: list of @smem_ptable_entry for the @num_entries partitions > + */ > +struct smem_ptable { > + u8 magic[4]; > + __le32 version; > + __le32 num_entries; > + __le32 reserved[5]; > + struct smem_ptable_entry entry[]; > +}; > + > +static const u8 SMEM_PTABLE_MAGIC[] = { 0x24, 0x54, 0x4f, 0x43 }; /* "$TOC" > */ > + > +/** > + * struct smem_partition_header - header of the partitions > + * @magic: magic number, must be SMEM_PART_MAGIC > + * @host0: first processor/host with access to this partition > + * @host1: second processor/host with access to this partition > + * @size: size of the partition > + * @offset_free_uncached: offset to the first free byte of uncached memory in > + * this partition > + * @offset_free_cached: offset to the first free byte of cached memory in > this > + * partition > + * @reserved: for now reserved entries > + */ > +struct smem_partition_header { > + u8 magic[4]; > + __le16 host0; > + __le16 host1; > + __le32 size; > + __le32 offset_free_uncached; > + __le32 offset_free_cached; > + __le32 reserved[3]; > +}; > + > +/** > + * struct smem_partition - describes smem partition > + * @virt_base: starting virtual address of partition > + * @phys_base: starting physical address of partition > + * @cacheline: alignment for "cached" entries > + * @size: size of partition > + */ > +struct smem_partition { > + void __iomem *virt_base; > + phys_addr_t phys_base; > + size_t cacheline; > + size_t size; > +}; > + > +static const u8 SMEM_PART_MAGIC[] = { 0x24, 0x50, 0x52, 0x54 }; > + > +/** > + * struct smem_private_entry - header of each item in the private partition > + * @canary: magic number, must be SMEM_PRIVATE_CANARY > + * @item: identifying number of the smem item > + * @size: size of the data, including padding bytes > + * @padding_data: number of bytes of padding of data > + * @padding_hdr: number of bytes of padding between the header and the data > + * @reserved: for now reserved entry > + */ > +struct smem_private_entry { > + u16 canary; /* bytes are the same so no swapping needed */ > + __le16 item; > + __le32 size; /* includes padding bytes */ > + __le16 padding_data; > + __le16 padding_hdr; > + __le32 reserved; > +}; > +#define SMEM_PRIVATE_CANARY 0xa5a5 > + > +/** > + * struct smem_info - smem region info located after the table of contents > + * @magic: magic number, must be SMEM_INFO_MAGIC > + * @size: size of the smem region > + * @base_addr: base address of the smem region > + * @reserved: for now reserved entry > + * @num_items: highest accepted item number > + */ > +struct smem_info { > + u8 magic[4]; > + __le32 size; > + __le32 base_addr; > + __le32 reserved; > + __le16 num_items; > +}; > + > +static const u8 SMEM_INFO_MAGIC[] = { 0x53, 0x49, 0x49, 0x49 }; /* SIII */ > + > +/** > + * struct smem_region - representation of a chunk of memory used for smem > + * @aux_base: identifier of aux_mem base > + * @virt_base: virtual base address of memory with this aux_mem > identifier > + * @size: size of the memory region > + */ > +struct smem_region { > + phys_addr_t aux_base; > + void __iomem *virt_base; > + size_t size; > +}; > + > +/** > + * struct qcom_smem - device data for the smem device > + * @dev: device pointer > + * @hwlock: reference to a hwspinlock > + * @ptable: virtual base of partition table > + * @global_partition: describes for global partition when in use > + * @partitions: list of partitions of current processor/host > + * @item_count: max accepted item number > + * @socinfo: platform device pointer > + * @num_regions: number of @regions > + * @regions: list of the memory regions defining the shared memory > + */ > +struct qcom_smem { > + struct device *dev; > + > + struct hwspinlock *hwlock; > + > + u32 item_count; > + struct platform_device *socinfo; > + struct smem_ptable *ptable; > + struct smem_partition global_partition; > + struct smem_partition partitions[SMEM_HOST_COUNT]; > + > + unsigned num_regions; > + struct smem_region regions[] __counted_by(num_regions); > +}; > + > +static void * > +phdr_to_last_uncached_entry(struct smem_partition_header *phdr) > +{ > + void *p = phdr; > + > + return p + le32_to_cpu(phdr->offset_free_uncached); > +} > + > +static struct smem_private_entry * > +phdr_to_first_cached_entry(struct smem_partition_header *phdr, > + size_t cacheline) > +{ > + void *p = phdr; > + struct smem_private_entry *e; > + > + return p + le32_to_cpu(phdr->size) - ALIGN(sizeof(*e), cacheline); > +} > + > +static void * > +phdr_to_last_cached_entry(struct smem_partition_header *phdr) > +{ > + void *p = phdr; > + > + return p + le32_to_cpu(phdr->offset_free_cached); > +} > + > +static struct smem_private_entry * > +phdr_to_first_uncached_entry(struct smem_partition_header *phdr) > +{ > + void *p = phdr; > + > + return p + sizeof(*phdr); > +} > + > +static struct smem_private_entry * > +uncached_entry_next(struct smem_private_entry *e) > +{ > + void *p = e; > + > + return p + sizeof(*e) + le16_to_cpu(e->padding_hdr) + > + le32_to_cpu(e->size); > +} > + > +static struct smem_private_entry * > +cached_entry_next(struct smem_private_entry *e, size_t cacheline) > +{ > + void *p = e; > + > + return p - le32_to_cpu(e->size) - ALIGN(sizeof(*e), cacheline); > +} > + > +static void *uncached_entry_to_item(struct smem_private_entry *e) > +{ > + void *p = e; > + > + return p + sizeof(*e) + le16_to_cpu(e->padding_hdr); > +} > + > +static void *cached_entry_to_item(struct smem_private_entry *e) > +{ > + void *p = e; > + > + return p - le32_to_cpu(e->size); > +} > + > +/* Pointer to the one and only smem handle */ > +static struct qcom_smem *__smem; > + > +/* Timeout (ms) for the trylock of remote spinlocks */ > +#define HWSPINLOCK_TIMEOUT 1000 > + > +/* The qcom hwspinlock id is always plus one from the smem host id */ > +#define SMEM_HOST_ID_TO_HWSPINLOCK_ID(__x) ((__x) + 1) > + > +/** > + * qcom_smem_bust_hwspin_lock_by_host() - bust the smem hwspinlock for a host > + * @host: remote processor id > + * > + * Busts the hwspin_lock for the given smem host id. This helper is intended > + * for remoteproc drivers that manage remoteprocs with an equivalent smem > + * driver instance in the remote firmware. Drivers can force a release of the > + * smem hwspin_lock if the rproc unexpectedly goes into a bad state. > + * > + * Context: Process context. > + * > + * Returns: 0 on success, otherwise negative errno. > + */ > +int qcom_smem_bust_hwspin_lock_by_host(unsigned int host) > +{ > + /* This function is for remote procs, so ignore SMEM_HOST_APPS */ > + if (host == SMEM_HOST_APPS || host >= SMEM_HOST_COUNT) > + return -EINVAL; > + > + return hwspin_lock_bust(__smem->hwlock, > SMEM_HOST_ID_TO_HWSPINLOCK_ID(host)); > +} > +EXPORT_SYMBOL_GPL(qcom_smem_bust_hwspin_lock_by_host); > + > +/** > + * qcom_smem_is_available() - Check if SMEM is available > + * > + * Return: true if SMEM is available, false otherwise. > + */ > +bool qcom_smem_is_available(void) > +{ > + return !!__smem; > +} > +EXPORT_SYMBOL_GPL(qcom_smem_is_available); > + > +static int qcom_smem_alloc_private(struct qcom_smem *smem, > + struct smem_partition *part, > + unsigned item, > + size_t size) > +{ > + struct smem_private_entry *hdr, *end; > + struct smem_partition_header *phdr; > + size_t alloc_size; > + void *cached; > + void *p_end; > + > + phdr = (struct smem_partition_header __force *)part->virt_base; > + p_end = (void *)phdr + part->size; > + > + hdr = phdr_to_first_uncached_entry(phdr); > + end = phdr_to_last_uncached_entry(phdr); > + cached = phdr_to_last_cached_entry(phdr); > + > + if (WARN_ON((void *)end > p_end || cached > p_end)) > + return -EINVAL; > + > + while (hdr < end) { > + if (hdr->canary != SMEM_PRIVATE_CANARY) > + goto bad_canary; > + if (le16_to_cpu(hdr->item) == item) > + return -EEXIST; > + > + hdr = uncached_entry_next(hdr); > + } > + > + if (WARN_ON((void *)hdr > p_end)) > + return -EINVAL; > + > + /* Check that we don't grow into the cached region */ > + alloc_size = sizeof(*hdr) + ALIGN(size, 8); > + if ((void *)hdr + alloc_size > cached) { > + dev_err(smem->dev, "Out of memory\n"); > + return -ENOSPC; > + } > + > + hdr->canary = SMEM_PRIVATE_CANARY; > + hdr->item = cpu_to_le16(item); > + hdr->size = cpu_to_le32(ALIGN(size, 8)); > + hdr->padding_data = cpu_to_le16(le32_to_cpu(hdr->size) - size); > + hdr->padding_hdr = 0; > + > + /* > + * Ensure the header is written before we advance the free offset, so > + * that remote processors that does not take the remote spinlock still > + * gets a consistent view of the linked list. > + */ > + wmb(); > + le32_add_cpu(&phdr->offset_free_uncached, alloc_size); > + > + return 0; > +bad_canary: > + dev_err(smem->dev, "Found invalid canary in hosts %hu:%hu partition\n", > + le16_to_cpu(phdr->host0), le16_to_cpu(phdr->host1)); > + > + return -EINVAL; > +} > + > +static int qcom_smem_alloc_global(struct qcom_smem *smem, > + unsigned item, > + size_t size) > +{ > + struct smem_global_entry *entry; > + struct smem_header *header; > + > + header = smem->regions[0].virt_base; > + entry = &header->toc[item]; > + if (entry->allocated) > + return -EEXIST; > + > + size = ALIGN(size, 8); > + if (WARN_ON(size > le32_to_cpu(header->available))) > + return -ENOMEM; > + > + entry->offset = header->free_offset; > + entry->size = cpu_to_le32(size); > + > + /* > + * Ensure the header is consistent before we mark the item allocated, > + * so that remote processors will get a consistent view of the item > + * even though they do not take the spinlock on read. > + */ > + wmb(); > + entry->allocated = cpu_to_le32(1); > + > + le32_add_cpu(&header->free_offset, size); > + le32_add_cpu(&header->available, -size); > + > + return 0; > +} > + > +/** > + * qcom_smem_alloc() - allocate space for a smem item > + * @host: remote processor id, or -1 > + * @item: smem item handle > + * @size: number of bytes to be allocated > + * > + * Allocate space for a given smem item of size @size, given that the item is > + * not yet allocated. > + */ > +int qcom_smem_alloc(unsigned host, unsigned item, size_t size) > +{ > + struct smem_partition *part; > + unsigned long flags; > + int ret; > + > + if (!__smem) > + return -EPROBE_DEFER; > + > + if (item < SMEM_ITEM_LAST_FIXED) { > + dev_err(__smem->dev, > + "Rejecting allocation of static entry %d\n", item); > + return -EINVAL; > + } > + > + if (WARN_ON(item >= __smem->item_count)) > + return -EINVAL; > + > + ret = hwspin_lock_timeout_irqsave(__smem->hwlock, > + HWSPINLOCK_TIMEOUT, > + &flags); > + if (ret) > + return ret; > + > + if (host < SMEM_HOST_COUNT && __smem->partitions[host].virt_base) { > + part = &__smem->partitions[host]; > + ret = qcom_smem_alloc_private(__smem, part, item, size); > + } else if (__smem->global_partition.virt_base) { > + part = &__smem->global_partition; > + ret = qcom_smem_alloc_private(__smem, part, item, size); > + } else { > + ret = qcom_smem_alloc_global(__smem, item, size); > + } > + > + hwspin_unlock_irqrestore(__smem->hwlock, &flags); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(qcom_smem_alloc); > + > +static void *qcom_smem_get_global(struct qcom_smem *smem, > + unsigned item, > + size_t *size) > +{ > + struct smem_header *header; > + struct smem_region *region; > + struct smem_global_entry *entry; > + u64 entry_offset; > + u32 e_size; > + u32 aux_base; > + unsigned i; > + > + header = smem->regions[0].virt_base; > + entry = &header->toc[item]; > + if (!entry->allocated) > + return ERR_PTR(-ENXIO); > + > + aux_base = le32_to_cpu(entry->aux_base) & AUX_BASE_MASK; > + > + for (i = 0; i < smem->num_regions; i++) { > + region = &smem->regions[i]; > + > + if ((u32)region->aux_base == aux_base || !aux_base) { > + e_size = le32_to_cpu(entry->size); > + entry_offset = le32_to_cpu(entry->offset); > + > + if (WARN_ON(e_size + entry_offset > region->size)) > + return ERR_PTR(-EINVAL); > + > + if (size != NULL) > + *size = e_size; > + > + return region->virt_base + entry_offset; > + } > + } > + > + return ERR_PTR(-ENOENT); > +} > + > +static void *qcom_smem_get_private(struct qcom_smem *smem, > + struct smem_partition *part, > + unsigned item, > + size_t *size) > +{ > + struct smem_private_entry *e, *end; > + struct smem_partition_header *phdr; > + void *item_ptr, *p_end; > + u32 padding_data; > + u32 e_size; > + > + phdr = (struct smem_partition_header __force *)part->virt_base; > + p_end = (void *)phdr + part->size; > + > + e = phdr_to_first_uncached_entry(phdr); > + end = phdr_to_last_uncached_entry(phdr); > + > + while (e < end) { > + if (e->canary != SMEM_PRIVATE_CANARY) > + goto invalid_canary; > + > + if (le16_to_cpu(e->item) == item) { > + if (size != NULL) { > + e_size = le32_to_cpu(e->size); > + padding_data = le16_to_cpu(e->padding_data); > + > + if (WARN_ON(e_size > part->size || padding_data > > e_size)) > + return ERR_PTR(-EINVAL); > + > + *size = e_size - padding_data; > + } > + > + item_ptr = uncached_entry_to_item(e); > + if (WARN_ON(item_ptr > p_end)) > + return ERR_PTR(-EINVAL); > + > + return item_ptr; > + } > + > + e = uncached_entry_next(e); > + } > + > + if (WARN_ON((void *)e > p_end)) > + return ERR_PTR(-EINVAL); > + > + /* Item was not found in the uncached list, search the cached list */ > + > + e = phdr_to_first_cached_entry(phdr, part->cacheline); > + end = phdr_to_last_cached_entry(phdr); > + > + if (WARN_ON((void *)e < (void *)phdr || (void *)end > p_end)) > + return ERR_PTR(-EINVAL); > + > + while (e > end) { > + if (e->canary != SMEM_PRIVATE_CANARY) > + goto invalid_canary; > + > + if (le16_to_cpu(e->item) == item) { > + if (size != NULL) { > + e_size = le32_to_cpu(e->size); > + padding_data = le16_to_cpu(e->padding_data); > + > + if (WARN_ON(e_size > part->size || padding_data > > e_size)) > + return ERR_PTR(-EINVAL); > + > + *size = e_size - padding_data; > + } > + > + item_ptr = cached_entry_to_item(e); > + if (WARN_ON(item_ptr < (void *)phdr)) > + return ERR_PTR(-EINVAL); > + > + return item_ptr; > + } > + > + e = cached_entry_next(e, part->cacheline); > + } > + > + if (WARN_ON((void *)e < (void *)phdr)) > + return ERR_PTR(-EINVAL); > + > + return ERR_PTR(-ENOENT); > + > +invalid_canary: > + dev_err(smem->dev, "Found invalid canary in hosts %hu:%hu partition\n", > + le16_to_cpu(phdr->host0), le16_to_cpu(phdr->host1)); > + > + return ERR_PTR(-EINVAL); > +} > + > +/** > + * qcom_smem_get() - resolve ptr of size of a smem item > + * @host: the remote processor, or -1 > + * @item: smem item handle > + * @size: pointer to be filled out with size of the item > + * > + * Looks up smem item and returns pointer to it. Size of smem > + * item is returned in @size. > + */ > +void *qcom_smem_get(unsigned host, unsigned item, size_t *size) > +{ > + struct smem_partition *part; > + void *ptr = ERR_PTR(-EPROBE_DEFER); > + > + if (!__smem) > + return ptr; > + > + if (WARN_ON(item >= __smem->item_count)) > + return ERR_PTR(-EINVAL); > + > + if (host < SMEM_HOST_COUNT && __smem->partitions[host].virt_base) { > + part = &__smem->partitions[host]; > + ptr = qcom_smem_get_private(__smem, part, item, size); > + } else if (__smem->global_partition.virt_base) { > + part = &__smem->global_partition; > + ptr = qcom_smem_get_private(__smem, part, item, size); > + } else { > + ptr = qcom_smem_get_global(__smem, item, size); > + } > + > + return ptr; > +} > +EXPORT_SYMBOL_GPL(qcom_smem_get); > + > +/** > + * qcom_smem_get_free_space() - retrieve amount of free space in a partition > + * @host: the remote processor identifying a partition, or -1 > + * > + * To be used by smem clients as a quick way to determine if any new > + * allocations has been made. > + */ > +int qcom_smem_get_free_space(unsigned host) > +{ > + struct smem_partition *part; > + struct smem_partition_header *phdr; > + struct smem_header *header; > + unsigned ret; > + > + if (!__smem) > + return -EPROBE_DEFER; > + > + if (host < SMEM_HOST_COUNT && __smem->partitions[host].virt_base) { > + part = &__smem->partitions[host]; > + phdr = part->virt_base; > + ret = le32_to_cpu(phdr->offset_free_cached) - > + le32_to_cpu(phdr->offset_free_uncached); > + > + if (ret > le32_to_cpu(part->size)) > + return -EINVAL; > + } else if (__smem->global_partition.virt_base) { > + part = &__smem->global_partition; > + phdr = part->virt_base; > + ret = le32_to_cpu(phdr->offset_free_cached) - > + le32_to_cpu(phdr->offset_free_uncached); > + > + if (ret > le32_to_cpu(part->size)) > + return -EINVAL; > + } else { > + header = __smem->regions[0].virt_base; > + ret = le32_to_cpu(header->available); > + > + if (ret > __smem->regions[0].size) > + return -EINVAL; > + } > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(qcom_smem_get_free_space); > + > +static bool addr_in_range(void __iomem *base, size_t size, void *addr) > +{ > + return base && ((void __iomem *)addr >= base && (void __iomem *)addr < > base + size); > +} > + > +/** > + * qcom_smem_virt_to_phys() - return the physical address associated > + * with an smem item pointer (previously returned by qcom_smem_get() > + * @p: the virtual address to convert > + * > + * Returns 0 if the pointer provided is not within any smem region. > + */ > +phys_addr_t qcom_smem_virt_to_phys(void *p) > +{ > + struct smem_partition *part; > + struct smem_region *area; > + u64 offset; > + u32 i; > + > + for (i = 0; i < SMEM_HOST_COUNT; i++) { > + part = &__smem->partitions[i]; > + > + if (addr_in_range(part->virt_base, part->size, p)) { > + offset = p - part->virt_base; > + > + return (phys_addr_t)part->phys_base + offset; > + } > + } > + > + part = &__smem->global_partition; > + > + if (addr_in_range(part->virt_base, part->size, p)) { > + offset = p - part->virt_base; > + > + return (phys_addr_t)part->phys_base + offset; > + } > + > + for (i = 0; i < __smem->num_regions; i++) { > + area = &__smem->regions[i]; > + > + if (addr_in_range(area->virt_base, area->size, p)) { > + offset = p - area->virt_base; > + > + return (phys_addr_t)area->aux_base + offset; > + } > + } > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(qcom_smem_virt_to_phys); > + > +/** > + * qcom_smem_get_soc_id() - return the SoC ID > + * @id: On success, we return the SoC ID here. > + * > + * Look up SoC ID from HW/SW build ID and return it. > + * > + * Return: 0 on success, negative errno on failure. > + */ > +int qcom_smem_get_soc_id(u32 *id) > +{ > + struct socinfo *info; > + > + info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID, NULL); > + if (IS_ERR(info)) > + return PTR_ERR(info); > + > + *id = __le32_to_cpu(info->id); > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(qcom_smem_get_soc_id); > + > +/** > + * qcom_smem_get_feature_code() - return the feature code > + * @code: On success, return the feature code here. > + * > + * Look up the feature code identifier from SMEM and return it. > + * > + * Return: 0 on success, negative errno on failure. > + */ > +int qcom_smem_get_feature_code(u32 *code) > +{ > + struct socinfo *info; > + u32 raw_code; > + > + info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID, NULL); > + if (IS_ERR(info)) > + return PTR_ERR(info); > + > + /* This only makes sense for socinfo >= 16 */ > + if (__le32_to_cpu(info->fmt) < SOCINFO_VERSION(0, 16)) > + return -EOPNOTSUPP; > + > + raw_code = __le32_to_cpu(info->feature_code); > + > + /* Ensure the value makes sense */ > + if (raw_code > SOCINFO_FC_INT_MAX) > + raw_code = SOCINFO_FC_UNKNOWN; > + > + *code = raw_code; > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(qcom_smem_get_feature_code); > + > +static int qcom_smem_get_sbl_version(struct qcom_smem *smem) > +{ > + struct smem_header *header; > + __le32 *versions; > + > + header = smem->regions[0].virt_base; > + versions = header->version; > + > + return le32_to_cpu(versions[SMEM_MASTER_SBL_VERSION_INDEX]); > +} > + > +static struct smem_ptable *qcom_smem_get_ptable(struct qcom_smem *smem) > +{ > + struct smem_ptable *ptable; > + u32 version; > + > + ptable = smem->ptable; > + if (memcmp(ptable->magic, SMEM_PTABLE_MAGIC, sizeof(ptable->magic))) > + return ERR_PTR(-ENOENT); > + > + version = le32_to_cpu(ptable->version); > + if (version != 1) { > + dev_err(smem->dev, > + "Unsupported partition header version %d\n", version); > + return ERR_PTR(-EINVAL); > + } > + return ptable; > +} > + > +static u32 qcom_smem_get_item_count(struct qcom_smem *smem) > +{ > + struct smem_ptable *ptable; > + struct smem_info *info; > + > + ptable = qcom_smem_get_ptable(smem); > + if (IS_ERR_OR_NULL(ptable)) > + return SMEM_ITEM_COUNT; > + > + info = (struct smem_info *)&ptable->entry[ptable->num_entries]; > + if (memcmp(info->magic, SMEM_INFO_MAGIC, sizeof(info->magic))) > + return SMEM_ITEM_COUNT; > + > + return le16_to_cpu(info->num_items); > +} > + > +/* > + * Validate the partition header for a partition whose partition > + * table entry is supplied. Returns a pointer to its header if > + * valid, or a null pointer otherwise. > + */ > +static struct smem_partition_header * > +qcom_smem_partition_header(struct qcom_smem *smem, > + struct smem_ptable_entry *entry, u16 host0, u16 host1) > +{ > + struct smem_partition_header *header; > + u32 phys_addr; > + u32 size; > + > + phys_addr = smem->regions[0].aux_base + le32_to_cpu(entry->offset); > + header = devm_ioremap_wc(smem->dev, phys_addr, > le32_to_cpu(entry->size)); > + > + if (!header) > + return NULL; > + > + if (memcmp(header->magic, SMEM_PART_MAGIC, sizeof(header->magic))) { > + dev_err(smem->dev, "bad partition magic %4ph\n", header->magic); > + return NULL; > + } > + > + if (host0 != le16_to_cpu(header->host0)) { > + dev_err(smem->dev, "bad host0 (%hu != %hu)\n", > + host0, le16_to_cpu(header->host0)); > + return NULL; > + } > + if (host1 != le16_to_cpu(header->host1)) { > + dev_err(smem->dev, "bad host1 (%hu != %hu)\n", > + host1, le16_to_cpu(header->host1)); > + return NULL; > + } > + > + size = le32_to_cpu(header->size); > + if (size != le32_to_cpu(entry->size)) { > + dev_err(smem->dev, "bad partition size (%u != %u)\n", > + size, le32_to_cpu(entry->size)); > + return NULL; > + } > + > + if (le32_to_cpu(header->offset_free_uncached) > size) { > + dev_err(smem->dev, "bad partition free uncached (%u > %u)\n", > + le32_to_cpu(header->offset_free_uncached), size); > + return NULL; > + } > + > + return header; > +} > + > +static int qcom_smem_set_global_partition(struct qcom_smem *smem) > +{ > + struct smem_partition_header *header; > + struct smem_ptable_entry *entry; > + struct smem_ptable *ptable; > + bool found = false; > + int i; > + > + if (smem->global_partition.virt_base) { > + dev_err(smem->dev, "Already found the global partition\n"); > + return -EINVAL; > + } > + > + ptable = qcom_smem_get_ptable(smem); > + if (IS_ERR(ptable)) > + return PTR_ERR(ptable); > + > + for (i = 0; i < le32_to_cpu(ptable->num_entries); i++) { > + entry = &ptable->entry[i]; > + if (!le32_to_cpu(entry->offset)) > + continue; > + if (!le32_to_cpu(entry->size)) > + continue; > + > + if (le16_to_cpu(entry->host0) != SMEM_GLOBAL_HOST) > + continue; > + > + if (le16_to_cpu(entry->host1) == SMEM_GLOBAL_HOST) { > + found = true; > + break; > + } > + } > + > + if (!found) { > + dev_err(smem->dev, "Missing entry for global partition\n"); > + return -EINVAL; > + } > + > + header = qcom_smem_partition_header(smem, entry, > + SMEM_GLOBAL_HOST, SMEM_GLOBAL_HOST); > + if (!header) > + return -EINVAL; > + > + smem->global_partition.virt_base = (void __iomem *)header; > + smem->global_partition.phys_base = smem->regions[0].aux_base + > + le32_to_cpu(entry->offset); > + smem->global_partition.size = le32_to_cpu(entry->size); > + smem->global_partition.cacheline = le32_to_cpu(entry->cacheline); > + > + return 0; > +} > + > +static int > +qcom_smem_enumerate_partitions(struct qcom_smem *smem, u16 local_host) > +{ > + struct smem_partition_header *header; > + struct smem_ptable_entry *entry; > + struct smem_ptable *ptable; > + u16 remote_host; > + u16 host0, host1; > + int i; > + > + ptable = qcom_smem_get_ptable(smem); > + if (IS_ERR(ptable)) > + return PTR_ERR(ptable); > + > + for (i = 0; i < le32_to_cpu(ptable->num_entries); i++) { > + entry = &ptable->entry[i]; > + if (!le32_to_cpu(entry->offset)) > + continue; > + if (!le32_to_cpu(entry->size)) > + continue; > + > + host0 = le16_to_cpu(entry->host0); > + host1 = le16_to_cpu(entry->host1); > + if (host0 == local_host) > + remote_host = host1; > + else if (host1 == local_host) > + remote_host = host0; > + else > + continue; > + > + if (remote_host >= SMEM_HOST_COUNT) { > + dev_err(smem->dev, "bad host %u\n", remote_host); > + return -EINVAL; > + } > + > + if (smem->partitions[remote_host].virt_base) { > + dev_err(smem->dev, "duplicate host %u\n", remote_host); > + return -EINVAL; > + } > + > + header = qcom_smem_partition_header(smem, entry, host0, host1); > + if (!header) > + return -EINVAL; > + > + smem->partitions[remote_host].virt_base = (void __iomem > *)header; > + smem->partitions[remote_host].phys_base = > smem->regions[0].aux_base + > + > le32_to_cpu(entry->offset); > + smem->partitions[remote_host].size = le32_to_cpu(entry->size); > + smem->partitions[remote_host].cacheline = > le32_to_cpu(entry->cacheline); > + } > + > + return 0; > +} > + > +static int qcom_smem_map_toc(struct qcom_smem *smem, struct smem_region > *region) > +{ > + u32 ptable_start; > + > + /* map starting 4K for smem header */ > + region->virt_base = devm_ioremap_wc(smem->dev, region->aux_base, SZ_4K); > + ptable_start = region->aux_base + region->size - SZ_4K; > + /* map last 4k for toc */ > + smem->ptable = devm_ioremap_wc(smem->dev, ptable_start, SZ_4K); > + > + if (!region->virt_base || !smem->ptable) > + return -ENOMEM; > + > + return 0; > +} > + > +static int qcom_smem_map_global(struct qcom_smem *smem, u32 size) > +{ > + u32 phys_addr; > + > + phys_addr = smem->regions[0].aux_base; > + > + smem->regions[0].size = size; > + smem->regions[0].virt_base = devm_ioremap_wc(smem->dev, phys_addr, > size); > + > + if (!smem->regions[0].virt_base) > + return -ENOMEM; > + > + return 0; > +} > + > +static int qcom_smem_resolve_mem(struct qcom_smem *smem, const char *name, > + struct smem_region *region) > +{ > + struct device *dev = smem->dev; > + struct device_node *np; > + struct resource r; > + int ret; > + > + np = of_parse_phandle(dev->of_node, name, 0); > + if (!np) { > + dev_err(dev, "No %s specified\n", name); > + return -EINVAL; > + } > + > + ret = of_address_to_resource(np, 0, &r); > + of_node_put(np); > + if (ret) > + return ret; > + > + region->aux_base = r.start; > + region->size = resource_size(&r); > + > + return 0; > +} > + > +static int qcom_smem_probe(struct platform_device *pdev) > +{ > + struct smem_header *header; > + struct reserved_mem *rmem; > + struct qcom_smem *smem; > + unsigned long flags; > + int num_regions; > + int hwlock_id; > + u32 version; > + u32 size; > + int ret; > + int i; > + > + if (__smem) > + return 0; > + > + num_regions = 1; > + if (of_property_present(pdev->dev.of_node, "qcom,rpm-msg-ram")) > + num_regions++; > + > + smem = devm_kzalloc(&pdev->dev, struct_size(smem, regions, num_regions), > + GFP_KERNEL); > + if (!smem) > + return -ENOMEM; > + > + smem->dev = &pdev->dev; > + smem->num_regions = num_regions; > + > + rmem = of_reserved_mem_lookup(pdev->dev.of_node); > + if (rmem) { > + smem->regions[0].aux_base = rmem->base; > + smem->regions[0].size = rmem->size; > + } else { > + /* > + * Fall back to the memory-region reference, if we're not a > + * reserved-memory node. > + */ > + ret = qcom_smem_resolve_mem(smem, "memory-region", > &smem->regions[0]); > + if (ret) > + return ret; > + } > + > + if (num_regions > 1) { > + ret = qcom_smem_resolve_mem(smem, "qcom,rpm-msg-ram", > &smem->regions[1]); > + if (ret) > + return ret; > + } > + > + > + ret = qcom_smem_map_toc(smem, &smem->regions[0]); > + if (ret) > + return ret; > + > + for (i = 1; i < num_regions; i++) { > + smem->regions[i].virt_base = devm_ioremap_wc(&pdev->dev, > + > smem->regions[i].aux_base, > + > smem->regions[i].size); > + if (!smem->regions[i].virt_base) { > + dev_err(&pdev->dev, "failed to remap %pa\n", > &smem->regions[i].aux_base); > + return -ENOMEM; > + } > + } > + > + header = smem->regions[0].virt_base; > + if (le32_to_cpu(header->initialized) != 1 || > + le32_to_cpu(header->reserved)) { > + dev_err(&pdev->dev, "SMEM is not initialized by SBL\n"); > + return -EINVAL; > + } > + > + hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0); > + if (hwlock_id < 0) { > + if (hwlock_id != -EPROBE_DEFER) > + dev_err(&pdev->dev, "failed to retrieve hwlock\n"); > + return hwlock_id; > + } > + > + smem->hwlock = hwspin_lock_request_specific(hwlock_id); > + if (!smem->hwlock) > + return -ENXIO; > + > + ret = hwspin_lock_timeout_irqsave(smem->hwlock, HWSPINLOCK_TIMEOUT, > &flags); > + if (ret) > + return ret; > + size = readl_relaxed(&header->available) + > readl_relaxed(&header->free_offset); > + hwspin_unlock_irqrestore(smem->hwlock, &flags); > + > + version = qcom_smem_get_sbl_version(smem); > + /* > + * smem header mapping is required only in heap version scheme, so unmap > + * it here. It will be remapped in qcom_smem_map_global() when whole > + * partition is mapped again. > + */ > + devm_iounmap(smem->dev, smem->regions[0].virt_base); > + switch (version >> 16) { > + case SMEM_GLOBAL_PART_VERSION: > + ret = qcom_smem_set_global_partition(smem); > + if (ret < 0) > + return ret; > + smem->item_count = qcom_smem_get_item_count(smem); > + break; > + case SMEM_GLOBAL_HEAP_VERSION: > + qcom_smem_map_global(smem, size); > + smem->item_count = SMEM_ITEM_COUNT; > + break; > + default: > + dev_err(&pdev->dev, "Unsupported SMEM version 0x%x\n", version); > + return -EINVAL; > + } > + > + BUILD_BUG_ON(SMEM_HOST_APPS >= SMEM_HOST_COUNT); > + ret = qcom_smem_enumerate_partitions(smem, SMEM_HOST_APPS); > + if (ret < 0 && ret != -ENOENT) > + return ret; > + > + __smem = smem; > + > + smem->socinfo = platform_device_register_data(&pdev->dev, > "qcom-socinfo", > + PLATFORM_DEVID_NONE, NULL, > + 0); > + if (IS_ERR(smem->socinfo)) > + dev_dbg(&pdev->dev, "failed to register socinfo device\n"); > + > + return 0; > +} > + > +static void qcom_smem_remove(struct platform_device *pdev) > +{ > + platform_device_unregister(__smem->socinfo); > + > + hwspin_lock_free(__smem->hwlock); > + __smem = NULL; > +} > + > +static const struct of_device_id qcom_smem_of_match[] = { > + { .compatible = "qcom,smem" }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, qcom_smem_of_match); > + > +static struct platform_driver qcom_smem_driver = { > + .probe = qcom_smem_probe, > + .remove_new = qcom_smem_remove, > + .driver = { > + .name = "qcom-smem", > + .of_match_table = qcom_smem_of_match, > + .suppress_bind_attrs = true, > + }, > +}; > + > +static int __init qcom_smem_init(void) > +{ > + return platform_driver_register(&qcom_smem_driver); > +} > +arch_initcall(qcom_smem_init); > + > +static void __exit qcom_smem_exit(void) > +{ > + platform_driver_unregister(&qcom_smem_driver); > +} > +module_exit(qcom_smem_exit) > + > +MODULE_AUTHOR("Bjorn Andersson <[email protected]>"); > +MODULE_DESCRIPTION("Qualcomm Shared Memory Manager"); > +MODULE_LICENSE("GPL v2"); > diff --git a/include/soc/qcom/smem.h b/include/soc/qcom/smem.h > new file mode 100644 > index 000000000000..f946e3beca21 > --- /dev/null > +++ b/include/soc/qcom/smem.h > @@ -0,0 +1,20 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +#ifndef __QCOM_SMEM_H__ > +#define __QCOM_SMEM_H__ > + > +#define QCOM_SMEM_HOST_ANY -1 > + > +bool qcom_smem_is_available(void); > +int qcom_smem_alloc(unsigned host, unsigned item, size_t size); > +void *qcom_smem_get(unsigned host, unsigned item, size_t *size); > + > +int qcom_smem_get_free_space(unsigned host); > + > +phys_addr_t qcom_smem_virt_to_phys(void *p); > + > +int qcom_smem_get_soc_id(u32 *id); > +int qcom_smem_get_feature_code(u32 *code); > + > +int qcom_smem_bust_hwspin_lock_by_host(unsigned int host); > + > +#endif > diff --git a/include/soc/qcom/socinfo.h b/include/soc/qcom/socinfo.h > new file mode 100644 > index 000000000000..608950443eee > --- /dev/null > +++ b/include/soc/qcom/socinfo.h > @@ -0,0 +1,111 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > + > +#ifndef __QCOM_SOCINFO_H__ > +#define __QCOM_SOCINFO_H__ > + > +#include <linux/types.h> > + > +/* > + * SMEM item id, used to acquire handles to respective > + * SMEM region. > + */ > +#define SMEM_HW_SW_BUILD_ID 137 > + > +#define SMEM_SOCINFO_BUILD_ID_LENGTH 32 > +#define SMEM_SOCINFO_CHIP_ID_LENGTH 32 > + > +/* > + * SoC version type with major number in the upper 16 bits and minor > + * number in the lower 16 bits. > + */ > +#define SOCINFO_MAJOR(ver) (((ver) >> 16) & 0xffff) > +#define SOCINFO_MINOR(ver) ((ver) & 0xffff) > +#define SOCINFO_VERSION(maj, min) ((((maj) & 0xffff) << 16)|((min) & > 0xffff)) > + > +/* Socinfo SMEM item structure */ > +struct socinfo { > + __le32 fmt; > + __le32 id; > + __le32 ver; > + char build_id[SMEM_SOCINFO_BUILD_ID_LENGTH]; > + /* Version 2 */ > + __le32 raw_id; > + __le32 raw_ver; > + /* Version 3 */ > + __le32 hw_plat; > + /* Version 4 */ > + __le32 plat_ver; > + /* Version 5 */ > + __le32 accessory_chip; > + /* Version 6 */ > + __le32 hw_plat_subtype; > + /* Version 7 */ > + __le32 pmic_model; > + __le32 pmic_die_rev; > + /* Version 8 */ > + __le32 pmic_model_1; > + __le32 pmic_die_rev_1; > + __le32 pmic_model_2; > + __le32 pmic_die_rev_2; > + /* Version 9 */ > + __le32 foundry_id; > + /* Version 10 */ > + __le32 serial_num; > + /* Version 11 */ > + __le32 num_pmics; > + __le32 pmic_array_offset; > + /* Version 12 */ > + __le32 chip_family; > + __le32 raw_device_family; > + __le32 raw_device_num; > + /* Version 13 */ > + __le32 nproduct_id; > + char chip_id[SMEM_SOCINFO_CHIP_ID_LENGTH]; > + /* Version 14 */ > + __le32 num_clusters; > + __le32 ncluster_array_offset; > + __le32 num_subset_parts; > + __le32 nsubset_parts_array_offset; > + /* Version 15 */ > + __le32 nmodem_supported; > + /* Version 16 */ > + __le32 feature_code; > + __le32 pcode; > + __le32 npartnamemap_offset; > + __le32 nnum_partname_mapping; > + /* Version 17 */ > + __le32 oem_variant; > + /* Version 18 */ > + __le32 num_kvps; > + __le32 kvps_offset; > + /* Version 19 */ > + __le32 num_func_clusters; > + __le32 boot_cluster; > + __le32 boot_core; > +}; > + > +/* Internal feature codes */ > +enum qcom_socinfo_feature_code { > + /* External feature codes */ > + SOCINFO_FC_UNKNOWN = 0x0, > + SOCINFO_FC_AA, > + SOCINFO_FC_AB, > + SOCINFO_FC_AC, > + SOCINFO_FC_AD, > + SOCINFO_FC_AE, > + SOCINFO_FC_AF, > + SOCINFO_FC_AG, > + SOCINFO_FC_AH, > +}; > + > +/* Internal feature codes */ > +/* Valid values: 0 <= n <= 0xf */ > +#define SOCINFO_FC_Yn(n) (0xf1 + (n)) > +#define SOCINFO_FC_INT_MAX SOCINFO_FC_Yn(0xf) > + > +/* Product codes */ > +#define SOCINFO_PC_UNKNOWN 0 > +#define SOCINFO_PCn(n) ((n) + 1) > +#define SOCINFO_PC_RESERVE (BIT(31) - 1) > + > +#endif > > -- > 2.53.0 >
