diff options
Diffstat (limited to 'snd-alpx/snd-alpx/core/generic/6.2/dmaengine.c')
| -rw-r--r-- | snd-alpx/snd-alpx/core/generic/6.2/dmaengine.c | 1652 |
1 files changed, 0 insertions, 1652 deletions
diff --git a/snd-alpx/snd-alpx/core/generic/6.2/dmaengine.c b/snd-alpx/snd-alpx/core/generic/6.2/dmaengine.c deleted file mode 100644 index 8a6e6b6..0000000 --- a/snd-alpx/snd-alpx/core/generic/6.2/dmaengine.c +++ /dev/null @@ -1,1652 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved. - */ - -/* - * This code implements the DMA subsystem. It provides a HW-neutral interface - * for other kernel code to use asynchronous memory copy capabilities, - * if present, and allows different HW DMA drivers to register as providing - * this capability. - * - * Due to the fact we are accelerating what is already a relatively fast - * operation, the code goes to great lengths to avoid additional overhead, - * such as locking. - * - * LOCKING: - * - * The subsystem keeps a global list of dma_device structs it is protected by a - * mutex, dma_list_mutex. - * - * A subsystem can get access to a channel by calling dmaengine_get() followed - * by dma_find_channel(), or if it has need for an exclusive channel it can call - * dma_request_channel(). Once a channel is allocated a reference is taken - * against its corresponding driver to disable removal. - * - * Each device has a channels list, which runs unlocked but is never modified - * once the device is registered, it's just setup by the driver. - * - * See Documentation/driver-api/dmaengine for more details - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/platform_device.h> -#include <linux/dma-mapping.h> -#include <linux/init.h> -#include <linux/module.h> -#include <linux/mm.h> -#include <linux/device.h> -#include <linux/dmaengine.h> -#include <linux/hardirq.h> -#include <linux/spinlock.h> -#include <linux/percpu.h> -#include <linux/rcupdate.h> -#include <linux/mutex.h> -#include <linux/jiffies.h> -#include <linux/rculist.h> -#include <linux/idr.h> -#include <linux/slab.h> -#include <linux/acpi.h> -#include <linux/acpi_dma.h> -#include <linux/of_dma.h> -#include <linux/mempool.h> -#include <linux/numa.h> - -#include "dmaengine.h" - -static DEFINE_MUTEX(dma_list_mutex); -static DEFINE_IDA(dma_ida); -static LIST_HEAD(dma_device_list); -static long dmaengine_ref_count; - -/* --- debugfs implementation --- */ -#ifdef CONFIG_DEBUG_FS -#include <linux/debugfs.h> - -static struct dentry *rootdir; - -static void dmaengine_debug_register(struct dma_device *dma_dev) -{ - dma_dev->dbg_dev_root = debugfs_create_dir(dev_name(dma_dev->dev), - rootdir); - if (IS_ERR(dma_dev->dbg_dev_root)) - dma_dev->dbg_dev_root = NULL; -} - -static void dmaengine_debug_unregister(struct dma_device *dma_dev) -{ - debugfs_remove_recursive(dma_dev->dbg_dev_root); - dma_dev->dbg_dev_root = NULL; -} - -static void dmaengine_dbg_summary_show(struct seq_file *s, - struct dma_device *dma_dev) -{ - struct dma_chan *chan; - - list_for_each_entry(chan, &dma_dev->channels, device_node) { - if (chan->client_count) { - seq_printf(s, " %-13s| %s", dma_chan_name(chan), - chan->dbg_client_name ?: "in-use"); - - if (chan->router) - seq_printf(s, " (via router: %s)\n", - dev_name(chan->router->dev)); - else - seq_puts(s, "\n"); - } - } -} - -static int dmaengine_summary_show(struct seq_file *s, void *data) -{ - struct dma_device *dma_dev = NULL; - - mutex_lock(&dma_list_mutex); - list_for_each_entry(dma_dev, &dma_device_list, global_node) { - seq_printf(s, "dma%d (%s): number of channels: %u\n", - dma_dev->dev_id, dev_name(dma_dev->dev), - dma_dev->chancnt); - - if (dma_dev->dbg_summary_show) - dma_dev->dbg_summary_show(s, dma_dev); - else - dmaengine_dbg_summary_show(s, dma_dev); - - if (!list_is_last(&dma_dev->global_node, &dma_device_list)) - seq_puts(s, "\n"); - } - mutex_unlock(&dma_list_mutex); - - return 0; -} -DEFINE_SHOW_ATTRIBUTE(dmaengine_summary); - -static void __init dmaengine_debugfs_init(void) -{ - rootdir = debugfs_create_dir("dmaengine", NULL); - - /* /sys/kernel/debug/dmaengine/summary */ - debugfs_create_file("summary", 0444, rootdir, NULL, - &dmaengine_summary_fops); -} -#else -static inline void dmaengine_debugfs_init(void) { } -static inline int dmaengine_debug_register(struct dma_device *dma_dev) -{ - return 0; -} - -static inline void dmaengine_debug_unregister(struct dma_device *dma_dev) { } -#endif /* DEBUG_FS */ - -/* --- sysfs implementation --- */ - -#define DMA_SLAVE_NAME "slave" - -/** - * dev_to_dma_chan - convert a device pointer to its sysfs container object - * @dev: device node - * - * Must be called under dma_list_mutex. - */ -static struct dma_chan *dev_to_dma_chan(struct device *dev) -{ - struct dma_chan_dev *chan_dev; - - chan_dev = container_of(dev, typeof(*chan_dev), device); - return chan_dev->chan; -} - -static ssize_t memcpy_count_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct dma_chan *chan; - unsigned long count = 0; - int i; - int err; - - mutex_lock(&dma_list_mutex); - chan = dev_to_dma_chan(dev); - if (chan) { - for_each_possible_cpu(i) - count += per_cpu_ptr(chan->local, i)->memcpy_count; - err = sprintf(buf, "%lu\n", count); - } else - err = -ENODEV; - mutex_unlock(&dma_list_mutex); - - return err; -} -static DEVICE_ATTR_RO(memcpy_count); - -static ssize_t bytes_transferred_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct dma_chan *chan; - unsigned long count = 0; - int i; - int err; - - mutex_lock(&dma_list_mutex); - chan = dev_to_dma_chan(dev); - if (chan) { - for_each_possible_cpu(i) - count += per_cpu_ptr(chan->local, i)->bytes_transferred; - err = sprintf(buf, "%lu\n", count); - } else - err = -ENODEV; - mutex_unlock(&dma_list_mutex); - - return err; -} -static DEVICE_ATTR_RO(bytes_transferred); - -static ssize_t in_use_show(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct dma_chan *chan; - int err; - - mutex_lock(&dma_list_mutex); - chan = dev_to_dma_chan(dev); - if (chan) - err = sprintf(buf, "%d\n", chan->client_count); - else - err = -ENODEV; - mutex_unlock(&dma_list_mutex); - - return err; -} -static DEVICE_ATTR_RO(in_use); - -static struct attribute *dma_dev_attrs[] = { - &dev_attr_memcpy_count.attr, - &dev_attr_bytes_transferred.attr, - &dev_attr_in_use.attr, - NULL, -}; -ATTRIBUTE_GROUPS(dma_dev); - -static void chan_dev_release(struct device *dev) -{ - struct dma_chan_dev *chan_dev; - - chan_dev = container_of(dev, typeof(*chan_dev), device); - kfree(chan_dev); -} - -static struct class dma_devclass = { - .name = "dma", - .dev_groups = dma_dev_groups, - .dev_release = chan_dev_release, -}; - -/* --- client and device registration --- */ - -/* enable iteration over all operation types */ -static dma_cap_mask_t dma_cap_mask_all; - -/** - * struct dma_chan_tbl_ent - tracks channel allocations per core/operation - * @chan: associated channel for this entry - */ -struct dma_chan_tbl_ent { - struct dma_chan *chan; -}; - -/* percpu lookup table for memory-to-memory offload providers */ -static struct dma_chan_tbl_ent __percpu *channel_table[DMA_TX_TYPE_END]; - -static int __init dma_channel_table_init(void) -{ - enum dma_transaction_type cap; - int err = 0; - - bitmap_fill(dma_cap_mask_all.bits, DMA_TX_TYPE_END); - - /* 'interrupt', 'private', and 'slave' are channel capabilities, - * but are not associated with an operation so they do not need - * an entry in the channel_table - */ - clear_bit(DMA_INTERRUPT, dma_cap_mask_all.bits); - clear_bit(DMA_PRIVATE, dma_cap_mask_all.bits); - clear_bit(DMA_SLAVE, dma_cap_mask_all.bits); - - for_each_dma_cap_mask(cap, dma_cap_mask_all) { - channel_table[cap] = alloc_percpu(struct dma_chan_tbl_ent); - if (!channel_table[cap]) { - err = -ENOMEM; - break; - } - } - - if (err) { - pr_err("dmaengine dma_channel_table_init failure: %d\n", err); - for_each_dma_cap_mask(cap, dma_cap_mask_all) - free_percpu(channel_table[cap]); - } - - return err; -} -arch_initcall(dma_channel_table_init); - -/** - * dma_chan_is_local - checks if the channel is in the same NUMA-node as the CPU - * @chan: DMA channel to test - * @cpu: CPU index which the channel should be close to - * - * Returns true if the channel is in the same NUMA-node as the CPU. - */ -static bool dma_chan_is_local(struct dma_chan *chan, int cpu) -{ - int node = dev_to_node(chan->device->dev); - return node == NUMA_NO_NODE || - cpumask_test_cpu(cpu, cpumask_of_node(node)); -} - -/** - * min_chan - finds the channel with min count and in the same NUMA-node as the CPU - * @cap: capability to match - * @cpu: CPU index which the channel should be close to - * - * If some channels are close to the given CPU, the one with the lowest - * reference count is returned. Otherwise, CPU is ignored and only the - * reference count is taken into account. - * - * Must be called under dma_list_mutex. - */ -static struct dma_chan *min_chan(enum dma_transaction_type cap, int cpu) -{ - struct dma_device *device; - struct dma_chan *chan; - struct dma_chan *min = NULL; - struct dma_chan *localmin = NULL; - - list_for_each_entry(device, &dma_device_list, global_node) { - if (!dma_has_cap(cap, device->cap_mask) || - dma_has_cap(DMA_PRIVATE, device->cap_mask)) - continue; - list_for_each_entry(chan, &device->channels, device_node) { - if (!chan->client_count) - continue; - if (!min || chan->table_count < min->table_count) - min = chan; - - if (dma_chan_is_local(chan, cpu)) - if (!localmin || - chan->table_count < localmin->table_count) - localmin = chan; - } - } - - chan = localmin ? localmin : min; - - if (chan) - chan->table_count++; - - return chan; -} - -/** - * dma_channel_rebalance - redistribute the available channels - * - * Optimize for CPU isolation (each CPU gets a dedicated channel for an - * operation type) in the SMP case, and operation isolation (avoid - * multi-tasking channels) in the non-SMP case. - * - * Must be called under dma_list_mutex. - */ -static void dma_channel_rebalance(void) -{ - struct dma_chan *chan; - struct dma_device *device; - int cpu; - int cap; - - /* undo the last distribution */ - for_each_dma_cap_mask(cap, dma_cap_mask_all) - for_each_possible_cpu(cpu) - per_cpu_ptr(channel_table[cap], cpu)->chan = NULL; - - list_for_each_entry(device, &dma_device_list, global_node) { - if (dma_has_cap(DMA_PRIVATE, device->cap_mask)) - continue; - list_for_each_entry(chan, &device->channels, device_node) - chan->table_count = 0; - } - - /* don't populate the channel_table if no clients are available */ - if (!dmaengine_ref_count) - return; - - /* redistribute available channels */ - for_each_dma_cap_mask(cap, dma_cap_mask_all) - for_each_online_cpu(cpu) { - chan = min_chan(cap, cpu); - per_cpu_ptr(channel_table[cap], cpu)->chan = chan; - } -} - -static int dma_device_satisfies_mask(struct dma_device *device, - const dma_cap_mask_t *want) -{ - dma_cap_mask_t has; - - bitmap_and(has.bits, want->bits, device->cap_mask.bits, - DMA_TX_TYPE_END); - return bitmap_equal(want->bits, has.bits, DMA_TX_TYPE_END); -} - -static struct module *dma_chan_to_owner(struct dma_chan *chan) -{ - return chan->device->owner; -} - -/** - * balance_ref_count - catch up the channel reference count - * @chan: channel to balance ->client_count versus dmaengine_ref_count - * - * Must be called under dma_list_mutex. - */ -static void balance_ref_count(struct dma_chan *chan) -{ - struct module *owner = dma_chan_to_owner(chan); - - while (chan->client_count < dmaengine_ref_count) { - __module_get(owner); - chan->client_count++; - } -} - -static void dma_device_release(struct kref *ref) -{ - struct dma_device *device = container_of(ref, struct dma_device, ref); - - list_del_rcu(&device->global_node); - dma_channel_rebalance(); - - if (device->device_release) - device->device_release(device); -} - -static void dma_device_put(struct dma_device *device) -{ - lockdep_assert_held(&dma_list_mutex); - kref_put(&device->ref, dma_device_release); -} - -/** - * dma_chan_get - try to grab a DMA channel's parent driver module - * @chan: channel to grab - * - * Must be called under dma_list_mutex. - */ -static int dma_chan_get(struct dma_chan *chan) -{ - struct module *owner = dma_chan_to_owner(chan); - int ret; - - /* The channel is already in use, update client count */ - if (chan->client_count) { - __module_get(owner); - chan->client_count++; - return 0; - } - - if (!try_module_get(owner)) - return -ENODEV; - - ret = kref_get_unless_zero(&chan->device->ref); - if (!ret) { - ret = -ENODEV; - goto module_put_out; - } - - /* allocate upon first client reference */ - if (chan->device->device_alloc_chan_resources) { - ret = chan->device->device_alloc_chan_resources(chan); - if (ret < 0) - goto err_out; - } - - chan->client_count++; - - if (!dma_has_cap(DMA_PRIVATE, chan->device->cap_mask)) - balance_ref_count(chan); - - return 0; - -err_out: - dma_device_put(chan->device); -module_put_out: - module_put(owner); - return ret; -} - -/** - * dma_chan_put - drop a reference to a DMA channel's parent driver module - * @chan: channel to release - * - * Must be called under dma_list_mutex. - */ -static void dma_chan_put(struct dma_chan *chan) -{ - /* This channel is not in use, bail out */ - if (!chan->client_count) - return; - - chan->client_count--; - - /* This channel is not in use anymore, free it */ - if (!chan->client_count && chan->device->device_free_chan_resources) { - /* Make sure all operations have completed */ - dmaengine_synchronize(chan); - chan->device->device_free_chan_resources(chan); - } - - /* If the channel is used via a DMA request router, free the mapping */ - if (chan->router && chan->router->route_free) { - chan->router->route_free(chan->router->dev, chan->route_data); - chan->router = NULL; - chan->route_data = NULL; - } - - dma_device_put(chan->device); - module_put(dma_chan_to_owner(chan)); -} - -enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie) -{ - enum dma_status status; - unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000); - - dma_async_issue_pending(chan); - do { - status = dma_async_is_tx_complete(chan, cookie, NULL, NULL); - if (time_after_eq(jiffies, dma_sync_wait_timeout)) { - dev_err(chan->device->dev, "%s: timeout!\n", __func__); - return DMA_ERROR; - } - if (status != DMA_IN_PROGRESS) - break; - cpu_relax(); - } while (1); - - return status; -} -EXPORT_SYMBOL(dma_sync_wait); - -/** - * dma_find_channel - find a channel to carry out the operation - * @tx_type: transaction type - */ -struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type) -{ - return this_cpu_read(channel_table[tx_type]->chan); -} -EXPORT_SYMBOL(dma_find_channel); - -/** - * dma_issue_pending_all - flush all pending operations across all channels - */ -void dma_issue_pending_all(void) -{ - struct dma_device *device; - struct dma_chan *chan; - - rcu_read_lock(); - list_for_each_entry_rcu(device, &dma_device_list, global_node) { - if (dma_has_cap(DMA_PRIVATE, device->cap_mask)) - continue; - list_for_each_entry(chan, &device->channels, device_node) - if (chan->client_count) - device->device_issue_pending(chan); - } - rcu_read_unlock(); -} -EXPORT_SYMBOL(dma_issue_pending_all); - -int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps) -{ - struct dma_device *device; - - if (!chan || !caps) - return -EINVAL; - - device = chan->device; - - /* check if the channel supports slave transactions */ - if (!(test_bit(DMA_SLAVE, device->cap_mask.bits) || - test_bit(DMA_CYCLIC, device->cap_mask.bits))) - return -ENXIO; - - /* - * Check whether it reports it uses the generic slave - * capabilities, if not, that means it doesn't support any - * kind of slave capabilities reporting. - */ - if (!device->directions) - return -ENXIO; - - caps->src_addr_widths = device->src_addr_widths; - caps->dst_addr_widths = device->dst_addr_widths; - caps->directions = device->directions; - caps->min_burst = device->min_burst; - caps->max_burst = device->max_burst; - caps->max_sg_burst = device->max_sg_burst; - caps->residue_granularity = device->residue_granularity; - caps->descriptor_reuse = device->descriptor_reuse; - caps->cmd_pause = !!device->device_pause; - caps->cmd_resume = !!device->device_resume; - caps->cmd_terminate = !!device->device_terminate_all; - - /* - * DMA engine device might be configured with non-uniformly - * distributed slave capabilities per device channels. In this - * case the corresponding driver may provide the device_caps - * callback to override the generic capabilities with - * channel-specific ones. - */ - if (device->device_caps) - device->device_caps(chan, caps); - - return 0; -} -EXPORT_SYMBOL_GPL(dma_get_slave_caps); - -static struct dma_chan *private_candidate(const dma_cap_mask_t *mask, - struct dma_device *dev, - dma_filter_fn fn, void *fn_param) -{ - struct dma_chan *chan; - - if (mask && !dma_device_satisfies_mask(dev, mask)) { - dev_dbg(dev->dev, "%s: wrong capabilities\n", __func__); - return NULL; - } - /* devices with multiple channels need special handling as we need to - * ensure that all channels are either private or public. - */ - if (dev->chancnt > 1 && !dma_has_cap(DMA_PRIVATE, dev->cap_mask)) - list_for_each_entry(chan, &dev->channels, device_node) { - /* some channels are already publicly allocated */ - if (chan->client_count) - return NULL; - } - - list_for_each_entry(chan, &dev->channels, device_node) { - if (chan->client_count) { - dev_dbg(dev->dev, "%s: %s busy\n", - __func__, dma_chan_name(chan)); - continue; - } - if (fn && !fn(chan, fn_param)) { - dev_dbg(dev->dev, "%s: %s filter said false\n", - __func__, dma_chan_name(chan)); - continue; - } - return chan; - } - - return NULL; -} - -static struct dma_chan *find_candidate(struct dma_device *device, - const dma_cap_mask_t *mask, - dma_filter_fn fn, void *fn_param) -{ - struct dma_chan *chan = private_candidate(mask, device, fn, fn_param); - int err; - - if (chan) { - /* Found a suitable channel, try to grab, prep, and return it. - * We first set DMA_PRIVATE to disable balance_ref_count as this - * channel will not be published in the general-purpose - * allocator - */ - dma_cap_set(DMA_PRIVATE, device->cap_mask); - device->privatecnt++; - err = dma_chan_get(chan); - - if (err) { - if (err == -ENODEV) { - dev_dbg(device->dev, "%s: %s module removed\n", - __func__, dma_chan_name(chan)); - list_del_rcu(&device->global_node); - } else - dev_dbg(device->dev, - "%s: failed to get %s: (%d)\n", - __func__, dma_chan_name(chan), err); - - if (--device->privatecnt == 0) - dma_cap_clear(DMA_PRIVATE, device->cap_mask); - - chan = ERR_PTR(err); - } - } - - return chan ? chan : ERR_PTR(-EPROBE_DEFER); -} - -/** - * dma_get_slave_channel - try to get specific channel exclusively - * @chan: target channel - */ -struct dma_chan *dma_get_slave_channel(struct dma_chan *chan) -{ - /* lock against __dma_request_channel */ - mutex_lock(&dma_list_mutex); - - if (chan->client_count == 0) { - struct dma_device *device = chan->device; - int err; - - dma_cap_set(DMA_PRIVATE, device->cap_mask); - device->privatecnt++; - err = dma_chan_get(chan); - if (err) { - dev_dbg(chan->device->dev, - "%s: failed to get %s: (%d)\n", - __func__, dma_chan_name(chan), err); - chan = NULL; - if (--device->privatecnt == 0) - dma_cap_clear(DMA_PRIVATE, device->cap_mask); - } - } else - chan = NULL; - - mutex_unlock(&dma_list_mutex); - - - return chan; -} -EXPORT_SYMBOL_GPL(dma_get_slave_channel); - -struct dma_chan *dma_get_any_slave_channel(struct dma_device *device) -{ - dma_cap_mask_t mask; - struct dma_chan *chan; - - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - - /* lock against __dma_request_channel */ - mutex_lock(&dma_list_mutex); - - chan = find_candidate(device, &mask, NULL, NULL); - - mutex_unlock(&dma_list_mutex); - - return IS_ERR(chan) ? NULL : chan; -} -EXPORT_SYMBOL_GPL(dma_get_any_slave_channel); - -/** - * __dma_request_channel - try to allocate an exclusive channel - * @mask: capabilities that the channel must satisfy - * @fn: optional callback to disposition available channels - * @fn_param: opaque parameter to pass to dma_filter_fn() - * @np: device node to look for DMA channels - * - * Returns pointer to appropriate DMA channel on success or NULL. - */ -struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask, - dma_filter_fn fn, void *fn_param, - struct device_node *np) -{ - struct dma_device *device, *_d; - struct dma_chan *chan = NULL; - - /* Find a channel */ - mutex_lock(&dma_list_mutex); - list_for_each_entry_safe(device, _d, &dma_device_list, global_node) { - /* Finds a DMA controller with matching device node */ - if (np && device->dev->of_node && np != device->dev->of_node) - continue; - - chan = find_candidate(device, mask, fn, fn_param); - if (!IS_ERR(chan)) - break; - - chan = NULL; - } - mutex_unlock(&dma_list_mutex); - - pr_debug("%s: %s (%s)\n", - __func__, - chan ? "success" : "fail", - chan ? dma_chan_name(chan) : NULL); - - return chan; -} -EXPORT_SYMBOL_GPL(__dma_request_channel); - -static const struct dma_slave_map *dma_filter_match(struct dma_device *device, - const char *name, - struct device *dev) -{ - int i; - - if (!device->filter.mapcnt) - return NULL; - - for (i = 0; i < device->filter.mapcnt; i++) { - const struct dma_slave_map *map = &device->filter.map[i]; - - if (!strcmp(map->devname, dev_name(dev)) && - !strcmp(map->slave, name)) - return map; - } - - return NULL; -} - -/** - * dma_request_chan - try to allocate an exclusive slave channel - * @dev: pointer to client device structure - * @name: slave channel name - * - * Returns pointer to appropriate DMA channel on success or an error pointer. - */ -struct dma_chan *dma_request_chan(struct device *dev, const char *name) -{ - struct dma_device *d, *_d; - struct dma_chan *chan = NULL; - - /* If device-tree is present get slave info from here */ - if (dev->of_node) - chan = of_dma_request_slave_channel(dev->of_node, name); - - /* If device was enumerated by ACPI get slave info from here */ - if (has_acpi_companion(dev) && !chan) - chan = acpi_dma_request_slave_chan_by_name(dev, name); - - if (PTR_ERR(chan) == -EPROBE_DEFER) - return chan; - - if (!IS_ERR_OR_NULL(chan)) - goto found; - - /* Try to find the channel via the DMA filter map(s) */ - mutex_lock(&dma_list_mutex); - list_for_each_entry_safe(d, _d, &dma_device_list, global_node) { - dma_cap_mask_t mask; - const struct dma_slave_map *map = dma_filter_match(d, name, dev); - - if (!map) - continue; - - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - - chan = find_candidate(d, &mask, d->filter.fn, map->param); - if (!IS_ERR(chan)) - break; - } - mutex_unlock(&dma_list_mutex); - - if (IS_ERR(chan)) - return chan; - if (!chan) - return ERR_PTR(-EPROBE_DEFER); - -found: -#ifdef CONFIG_DEBUG_FS - chan->dbg_client_name = kasprintf(GFP_KERNEL, "%s:%s", dev_name(dev), - name); -#endif - - chan->name = kasprintf(GFP_KERNEL, "dma:%s", name); - if (!chan->name) - return chan; - chan->slave = dev; - - if (sysfs_create_link(&chan->dev->device.kobj, &dev->kobj, - DMA_SLAVE_NAME)) - dev_warn(dev, "Cannot create DMA %s symlink\n", DMA_SLAVE_NAME); - if (sysfs_create_link(&dev->kobj, &chan->dev->device.kobj, chan->name)) - dev_warn(dev, "Cannot create DMA %s symlink\n", chan->name); - - return chan; -} -EXPORT_SYMBOL_GPL(dma_request_chan); - -/** - * dma_request_chan_by_mask - allocate a channel satisfying certain capabilities - * @mask: capabilities that the channel must satisfy - * - * Returns pointer to appropriate DMA channel on success or an error pointer. - */ -struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask) -{ - struct dma_chan *chan; - - if (!mask) - return ERR_PTR(-ENODEV); - - chan = __dma_request_channel(mask, NULL, NULL, NULL); - if (!chan) { - mutex_lock(&dma_list_mutex); - if (list_empty(&dma_device_list)) - chan = ERR_PTR(-EPROBE_DEFER); - else - chan = ERR_PTR(-ENODEV); - mutex_unlock(&dma_list_mutex); - } - - return chan; -} -EXPORT_SYMBOL_GPL(dma_request_chan_by_mask); - -void dma_release_channel(struct dma_chan *chan) -{ - mutex_lock(&dma_list_mutex); - WARN_ONCE(chan->client_count != 1, - "chan reference count %d != 1\n", chan->client_count); - dma_chan_put(chan); - /* drop PRIVATE cap enabled by __dma_request_channel() */ - if (--chan->device->privatecnt == 0) - dma_cap_clear(DMA_PRIVATE, chan->device->cap_mask); - - if (chan->slave) { - sysfs_remove_link(&chan->dev->device.kobj, DMA_SLAVE_NAME); - sysfs_remove_link(&chan->slave->kobj, chan->name); - kfree(chan->name); - chan->name = NULL; - chan->slave = NULL; - } - -#ifdef CONFIG_DEBUG_FS - kfree(chan->dbg_client_name); - chan->dbg_client_name = NULL; -#endif - mutex_unlock(&dma_list_mutex); -} -EXPORT_SYMBOL_GPL(dma_release_channel); - -/** - * dmaengine_get - register interest in dma_channels - */ -void dmaengine_get(void) -{ - struct dma_device *device, *_d; - struct dma_chan *chan; - int err; - - mutex_lock(&dma_list_mutex); - dmaengine_ref_count++; - - /* try to grab channels */ - list_for_each_entry_safe(device, _d, &dma_device_list, global_node) { - if (dma_has_cap(DMA_PRIVATE, device->cap_mask)) - continue; - list_for_each_entry(chan, &device->channels, device_node) { - err = dma_chan_get(chan); - if (err == -ENODEV) { - /* module removed before we could use it */ - list_del_rcu(&device->global_node); - break; - } else if (err) - dev_dbg(chan->device->dev, - "%s: failed to get %s: (%d)\n", - __func__, dma_chan_name(chan), err); - } - } - - /* if this is the first reference and there were channels - * waiting we need to rebalance to get those channels - * incorporated into the channel table - */ - if (dmaengine_ref_count == 1) - dma_channel_rebalance(); - mutex_unlock(&dma_list_mutex); -} -EXPORT_SYMBOL(dmaengine_get); - -/** - * dmaengine_put - let DMA drivers be removed when ref_count == 0 - */ -void dmaengine_put(void) -{ - struct dma_device *device, *_d; - struct dma_chan *chan; - - mutex_lock(&dma_list_mutex); - dmaengine_ref_count--; - BUG_ON(dmaengine_ref_count < 0); - /* drop channel references */ - list_for_each_entry_safe(device, _d, &dma_device_list, global_node) { - if (dma_has_cap(DMA_PRIVATE, device->cap_mask)) - continue; - list_for_each_entry(chan, &device->channels, device_node) - dma_chan_put(chan); - } - mutex_unlock(&dma_list_mutex); -} -EXPORT_SYMBOL(dmaengine_put); - -static bool device_has_all_tx_types(struct dma_device *device) -{ - /* A device that satisfies this test has channels that will never cause - * an async_tx channel switch event as all possible operation types can - * be handled. - */ - #ifdef CONFIG_ASYNC_TX_DMA - if (!dma_has_cap(DMA_INTERRUPT, device->cap_mask)) - return false; - #endif - - #if IS_ENABLED(CONFIG_ASYNC_MEMCPY) - if (!dma_has_cap(DMA_MEMCPY, device->cap_mask)) - return false; - #endif - - #if IS_ENABLED(CONFIG_ASYNC_XOR) - if (!dma_has_cap(DMA_XOR, device->cap_mask)) - return false; - - #ifndef CONFIG_ASYNC_TX_DISABLE_XOR_VAL_DMA - if (!dma_has_cap(DMA_XOR_VAL, device->cap_mask)) - return false; - #endif - #endif - - #if IS_ENABLED(CONFIG_ASYNC_PQ) - if (!dma_has_cap(DMA_PQ, device->cap_mask)) - return false; - - #ifndef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA - if (!dma_has_cap(DMA_PQ_VAL, device->cap_mask)) - return false; - #endif - #endif - - return true; -} - -static int get_dma_id(struct dma_device *device) -{ - int rc = ida_alloc(&dma_ida, GFP_KERNEL); - - if (rc < 0) - return rc; - device->dev_id = rc; - return 0; -} - -static int __dma_async_device_channel_register(struct dma_device *device, - struct dma_chan *chan) -{ - int rc; - - chan->local = alloc_percpu(typeof(*chan->local)); - if (!chan->local) - return -ENOMEM; - chan->dev = kzalloc(sizeof(*chan->dev), GFP_KERNEL); - if (!chan->dev) { - rc = -ENOMEM; - goto err_free_local; - } - - /* - * When the chan_id is a negative value, we are dynamically adding - * the channel. Otherwise we are static enumerating. - */ - chan->chan_id = ida_alloc(&device->chan_ida, GFP_KERNEL); - if (chan->chan_id < 0) { - pr_err("%s: unable to alloc ida for chan: %d\n", - __func__, chan->chan_id); - rc = chan->chan_id; - goto err_free_dev; - } - - chan->dev->device.class = &dma_devclass; - chan->dev->device.parent = device->dev; - chan->dev->chan = chan; - chan->dev->dev_id = device->dev_id; - dev_set_name(&chan->dev->device, "dma%dchan%d", - device->dev_id, chan->chan_id); - rc = device_register(&chan->dev->device); - if (rc) - goto err_out_ida; - chan->client_count = 0; - device->chancnt++; - - return 0; - - err_out_ida: - ida_free(&device->chan_ida, chan->chan_id); - err_free_dev: - kfree(chan->dev); - err_free_local: - free_percpu(chan->local); - chan->local = NULL; - return rc; -} - -int dma_async_device_channel_register(struct dma_device *device, - struct dma_chan *chan) -{ - int rc; - - rc = __dma_async_device_channel_register(device, chan); - if (rc < 0) - return rc; - - dma_channel_rebalance(); - return 0; -} -EXPORT_SYMBOL_GPL(dma_async_device_channel_register); - -static void __dma_async_device_channel_unregister(struct dma_device *device, - struct dma_chan *chan) -{ - WARN_ONCE(!device->device_release && chan->client_count, - "%s called while %d clients hold a reference\n", - __func__, chan->client_count); - mutex_lock(&dma_list_mutex); - device->chancnt--; - chan->dev->chan = NULL; - mutex_unlock(&dma_list_mutex); - ida_free(&device->chan_ida, chan->chan_id); - device_unregister(&chan->dev->device); - free_percpu(chan->local); -} - -void dma_async_device_channel_unregister(struct dma_device *device, - struct dma_chan *chan) -{ - __dma_async_device_channel_unregister(device, chan); - dma_channel_rebalance(); -} -EXPORT_SYMBOL_GPL(dma_async_device_channel_unregister); - -/** - * dma_async_device_register - registers DMA devices found - * @device: pointer to &struct dma_device - * - * After calling this routine the structure should not be freed except in the - * device_release() callback which will be called after - * dma_async_device_unregister() is called and no further references are taken. - */ -int dma_async_device_register(struct dma_device *device) -{ - int rc; - struct dma_chan* chan; - - if (!device) - return -ENODEV; - - /* validate device routines */ - if (!device->dev) { - pr_err("DMAdevice must have dev\n"); - return -EIO; - } - - device->owner = device->dev->driver->owner; - - if (dma_has_cap(DMA_MEMCPY, device->cap_mask) && !device->device_prep_dma_memcpy) { - dev_err(device->dev, - "Device claims capability %s, but op is not defined\n", - "DMA_MEMCPY"); - return -EIO; - } - - if (dma_has_cap(DMA_XOR, device->cap_mask) && !device->device_prep_dma_xor) { - dev_err(device->dev, - "Device claims capability %s, but op is not defined\n", - "DMA_XOR"); - return -EIO; - } - - if (dma_has_cap(DMA_XOR_VAL, device->cap_mask) && !device->device_prep_dma_xor_val) { - dev_err(device->dev, - "Device claims capability %s, but op is not defined\n", - "DMA_XOR_VAL"); - return -EIO; - } - - if (dma_has_cap(DMA_PQ, device->cap_mask) && !device->device_prep_dma_pq) { - dev_err(device->dev, - "Device claims capability %s, but op is not defined\n", - "DMA_PQ"); - return -EIO; - } - - if (dma_has_cap(DMA_PQ_VAL, device->cap_mask) && !device->device_prep_dma_pq_val) { - dev_err(device->dev, - "Device claims capability %s, but op is not defined\n", - "DMA_PQ_VAL"); - return -EIO; - } - - if (dma_has_cap(DMA_MEMSET, device->cap_mask) && !device->device_prep_dma_memset) { - dev_err(device->dev, - "Device claims capability %s, but op is not defined\n", - "DMA_MEMSET"); - return -EIO; - } - - if (dma_has_cap(DMA_INTERRUPT, device->cap_mask) && !device->device_prep_dma_interrupt) { - dev_err(device->dev, - "Device claims capability %s, but op is not defined\n", - "DMA_INTERRUPT"); - return -EIO; - } - - if (dma_has_cap(DMA_CYCLIC, device->cap_mask) && !device->device_prep_dma_cyclic) { - dev_err(device->dev, - "Device claims capability %s, but op is not defined\n", - "DMA_CYCLIC"); - return -EIO; - } - - if (dma_has_cap(DMA_INTERLEAVE, device->cap_mask) && !device->device_prep_interleaved_dma) { - dev_err(device->dev, - "Device claims capability %s, but op is not defined\n", - "DMA_INTERLEAVE"); - return -EIO; - } - - - if (!device->device_tx_status) { - dev_err(device->dev, "Device tx_status is not defined\n"); - return -EIO; - } - - - if (!device->device_issue_pending) { - dev_err(device->dev, "Device issue_pending is not defined\n"); - return -EIO; - } - - if (!device->device_release) - dev_dbg(device->dev, - "WARN: Device release is not defined so it is not safe to unbind this driver while in use\n"); - - kref_init(&device->ref); - - /* note: this only matters in the - * CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH=n case - */ - if (device_has_all_tx_types(device)) - dma_cap_set(DMA_ASYNC_TX, device->cap_mask); - - rc = get_dma_id(device); - if (rc != 0) - return rc; - - ida_init(&device->chan_ida); - - /* represent channels in sysfs. Probably want devs too */ - list_for_each_entry(chan, &device->channels, device_node) { - rc = __dma_async_device_channel_register(device, chan); - if (rc < 0) - goto err_out; - } - - mutex_lock(&dma_list_mutex); - /* take references on public channels */ - if (dmaengine_ref_count && !dma_has_cap(DMA_PRIVATE, device->cap_mask)) - list_for_each_entry(chan, &device->channels, device_node) { - /* if clients are already waiting for channels we need - * to take references on their behalf - */ - if (dma_chan_get(chan) == -ENODEV) { - /* note we can only get here for the first - * channel as the remaining channels are - * guaranteed to get a reference - */ - rc = -ENODEV; - mutex_unlock(&dma_list_mutex); - goto err_out; - } - } - list_add_tail_rcu(&device->global_node, &dma_device_list); - if (dma_has_cap(DMA_PRIVATE, device->cap_mask)) - device->privatecnt++; /* Always private */ - dma_channel_rebalance(); - mutex_unlock(&dma_list_mutex); - - dmaengine_debug_register(device); - - return 0; - -err_out: - /* if we never registered a channel just release the idr */ - if (!device->chancnt) { - ida_free(&dma_ida, device->dev_id); - return rc; - } - - list_for_each_entry(chan, &device->channels, device_node) { - if (chan->local == NULL) - continue; - mutex_lock(&dma_list_mutex); - chan->dev->chan = NULL; - mutex_unlock(&dma_list_mutex); - device_unregister(&chan->dev->device); - free_percpu(chan->local); - } - return rc; -} -EXPORT_SYMBOL(dma_async_device_register); - -/** - * dma_async_device_unregister - unregister a DMA device - * @device: pointer to &struct dma_device - * - * This routine is called by dma driver exit routines, dmaengine holds module - * references to prevent it being called while channels are in use. - */ -void dma_async_device_unregister(struct dma_device *device) -{ - struct dma_chan *chan, *n; - - dmaengine_debug_unregister(device); - - list_for_each_entry_safe(chan, n, &device->channels, device_node) - __dma_async_device_channel_unregister(device, chan); - - mutex_lock(&dma_list_mutex); - /* - * setting DMA_PRIVATE ensures the device being torn down will not - * be used in the channel_table - */ - dma_cap_set(DMA_PRIVATE, device->cap_mask); - dma_channel_rebalance(); - ida_free(&dma_ida, device->dev_id); - dma_device_put(device); - mutex_unlock(&dma_list_mutex); -} -EXPORT_SYMBOL(dma_async_device_unregister); - -static void dmam_device_release(struct device *dev, void *res) -{ - struct dma_device *device; - - device = *(struct dma_device **)res; - dma_async_device_unregister(device); -} - -/** - * dmaenginem_async_device_register - registers DMA devices found - * @device: pointer to &struct dma_device - * - * The operation is managed and will be undone on driver detach. - */ -int dmaenginem_async_device_register(struct dma_device *device) -{ - void *p; - int ret; - - p = devres_alloc(dmam_device_release, sizeof(void *), GFP_KERNEL); - if (!p) - return -ENOMEM; - - ret = dma_async_device_register(device); - if (!ret) { - *(struct dma_device **)p = device; - devres_add(device->dev, p); - } else { - devres_free(p); - } - - return ret; -} -EXPORT_SYMBOL(dmaenginem_async_device_register); - -struct dmaengine_unmap_pool { - struct kmem_cache *cache; - const char *name; - mempool_t *pool; - size_t size; -}; - -#define __UNMAP_POOL(x) { .size = x, .name = "dmaengine-unmap-" __stringify(x) } -static struct dmaengine_unmap_pool unmap_pool[] = { - __UNMAP_POOL(2), - #if IS_ENABLED(CONFIG_DMA_ENGINE_RAID) - __UNMAP_POOL(16), - __UNMAP_POOL(128), - __UNMAP_POOL(256), - #endif -}; - -static struct dmaengine_unmap_pool *__get_unmap_pool(int nr) -{ - int order = get_count_order(nr); - - switch (order) { - case 0 ... 1: - return &unmap_pool[0]; -#if IS_ENABLED(CONFIG_DMA_ENGINE_RAID) - case 2 ... 4: - return &unmap_pool[1]; - case 5 ... 7: - return &unmap_pool[2]; - case 8: - return &unmap_pool[3]; -#endif - default: - BUG(); - return NULL; - } -} - -static void dmaengine_unmap(struct kref *kref) -{ - struct dmaengine_unmap_data *unmap = container_of(kref, typeof(*unmap), kref); - struct device *dev = unmap->dev; - int cnt, i; - - cnt = unmap->to_cnt; - for (i = 0; i < cnt; i++) - dma_unmap_page(dev, unmap->addr[i], unmap->len, - DMA_TO_DEVICE); - cnt += unmap->from_cnt; - for (; i < cnt; i++) - dma_unmap_page(dev, unmap->addr[i], unmap->len, - DMA_FROM_DEVICE); - cnt += unmap->bidi_cnt; - for (; i < cnt; i++) { - if (unmap->addr[i] == 0) - continue; - dma_unmap_page(dev, unmap->addr[i], unmap->len, - DMA_BIDIRECTIONAL); - } - cnt = unmap->map_cnt; - mempool_free(unmap, __get_unmap_pool(cnt)->pool); -} - -void dmaengine_unmap_put(struct dmaengine_unmap_data *unmap) -{ - if (unmap) - kref_put(&unmap->kref, dmaengine_unmap); -} -EXPORT_SYMBOL_GPL(dmaengine_unmap_put); - -static void dmaengine_destroy_unmap_pool(void) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(unmap_pool); i++) { - struct dmaengine_unmap_pool *p = &unmap_pool[i]; - - mempool_destroy(p->pool); - p->pool = NULL; - kmem_cache_destroy(p->cache); - p->cache = NULL; - } -} - -static int __init dmaengine_init_unmap_pool(void) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(unmap_pool); i++) { - struct dmaengine_unmap_pool *p = &unmap_pool[i]; - size_t size; - - size = sizeof(struct dmaengine_unmap_data) + - sizeof(dma_addr_t) * p->size; - - p->cache = kmem_cache_create(p->name, size, 0, - SLAB_HWCACHE_ALIGN, NULL); - if (!p->cache) - break; - p->pool = mempool_create_slab_pool(1, p->cache); - if (!p->pool) - break; - } - - if (i == ARRAY_SIZE(unmap_pool)) - return 0; - - dmaengine_destroy_unmap_pool(); - return -ENOMEM; -} - -struct dmaengine_unmap_data * -dmaengine_get_unmap_data(struct device *dev, int nr, gfp_t flags) -{ - struct dmaengine_unmap_data *unmap; - - unmap = mempool_alloc(__get_unmap_pool(nr)->pool, flags); - if (!unmap) - return NULL; - - memset(unmap, 0, sizeof(*unmap)); - kref_init(&unmap->kref); - unmap->dev = dev; - unmap->map_cnt = nr; - - return unmap; -} -EXPORT_SYMBOL(dmaengine_get_unmap_data); - -void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx, - struct dma_chan *chan) -{ - tx->chan = chan; - #ifdef CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH - spin_lock_init(&tx->lock); - #endif -} -EXPORT_SYMBOL(dma_async_tx_descriptor_init); - -static inline int desc_check_and_set_metadata_mode( - struct dma_async_tx_descriptor *desc, enum dma_desc_metadata_mode mode) -{ - /* Make sure that the metadata mode is not mixed */ - if (!desc->desc_metadata_mode) { - if (dmaengine_is_metadata_mode_supported(desc->chan, mode)) - desc->desc_metadata_mode = mode; - else - return -ENOTSUPP; - } else if (desc->desc_metadata_mode != mode) { - return -EINVAL; - } - - return 0; -} - -int dmaengine_desc_attach_metadata(struct dma_async_tx_descriptor *desc, - void *data, size_t len) -{ - int ret; - - if (!desc) - return -EINVAL; - - ret = desc_check_and_set_metadata_mode(desc, DESC_METADATA_CLIENT); - if (ret) - return ret; - - if (!desc->metadata_ops || !desc->metadata_ops->attach) - return -ENOTSUPP; - - return desc->metadata_ops->attach(desc, data, len); -} -EXPORT_SYMBOL_GPL(dmaengine_desc_attach_metadata); - -void *dmaengine_desc_get_metadata_ptr(struct dma_async_tx_descriptor *desc, - size_t *payload_len, size_t *max_len) -{ - int ret; - - if (!desc) - return ERR_PTR(-EINVAL); - - ret = desc_check_and_set_metadata_mode(desc, DESC_METADATA_ENGINE); - if (ret) - return ERR_PTR(ret); - - if (!desc->metadata_ops || !desc->metadata_ops->get_ptr) - return ERR_PTR(-ENOTSUPP); - - return desc->metadata_ops->get_ptr(desc, payload_len, max_len); -} -EXPORT_SYMBOL_GPL(dmaengine_desc_get_metadata_ptr); - -int dmaengine_desc_set_metadata_len(struct dma_async_tx_descriptor *desc, - size_t payload_len) -{ - int ret; - - if (!desc) - return -EINVAL; - - ret = desc_check_and_set_metadata_mode(desc, DESC_METADATA_ENGINE); - if (ret) - return ret; - - if (!desc->metadata_ops || !desc->metadata_ops->set_len) - return -ENOTSUPP; - - return desc->metadata_ops->set_len(desc, payload_len); -} -EXPORT_SYMBOL_GPL(dmaengine_desc_set_metadata_len); - -/** - * dma_wait_for_async_tx - spin wait for a transaction to complete - * @tx: in-flight transaction to wait on - */ -enum dma_status -dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx) -{ - unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000); - - if (!tx) - return DMA_COMPLETE; - - while (tx->cookie == -EBUSY) { - if (time_after_eq(jiffies, dma_sync_wait_timeout)) { - dev_err(tx->chan->device->dev, - "%s timeout waiting for descriptor submission\n", - __func__); - return DMA_ERROR; - } - cpu_relax(); - } - return dma_sync_wait(tx->chan, tx->cookie); -} -EXPORT_SYMBOL_GPL(dma_wait_for_async_tx); - -/** - * dma_run_dependencies - process dependent operations on the target channel - * @tx: transaction with dependencies - * - * Helper routine for DMA drivers to process (start) dependent operations - * on their target channel. - */ -void dma_run_dependencies(struct dma_async_tx_descriptor *tx) -{ - struct dma_async_tx_descriptor *dep = txd_next(tx); - struct dma_async_tx_descriptor *dep_next; - struct dma_chan *chan; - - if (!dep) - return; - - /* we'll submit tx->next now, so clear the link */ - txd_clear_next(tx); - chan = dep->chan; - - /* keep submitting up until a channel switch is detected - * in that case we will be called again as a result of - * processing the interrupt from async_tx_channel_switch - */ - for (; dep; dep = dep_next) { - txd_lock(dep); - txd_clear_parent(dep); - dep_next = txd_next(dep); - if (dep_next && dep_next->chan == chan) - txd_clear_next(dep); /* ->next will be submitted */ - else - dep_next = NULL; /* submit current dep and terminate */ - txd_unlock(dep); - - dep->tx_submit(dep); - } - - chan->device->device_issue_pending(chan); -} -EXPORT_SYMBOL_GPL(dma_run_dependencies); - -static int __init dma_bus_init(void) -{ - int err = dmaengine_init_unmap_pool(); - - if (err) - return err; - - err = class_register(&dma_devclass); - if (!err) - dmaengine_debugfs_init(); - - return err; -} -arch_initcall(dma_bus_init); |