Revision 5fc6b075e165f641fbc366b58b578055762d5f8c authored by Linus Torvalds on 30 October 2020, 22:02:49 UTC, committed by Linus Torvalds on 30 October 2020, 22:02:49 UTC
Pull block fixes from Jens Axboe: - null_blk zone fixes (Damien, Kanchan) - NVMe pull request from Christoph: - improve zone revalidation (Keith Busch) - gracefully handle zero length messages in nvme-rdma (zhenwei pi) - nvme-fc error handling fixes (James Smart) - nvmet tracing NULL pointer dereference fix (Chaitanya Kulkarni)" - xsysace platform fixes (Andy) - scatterlist type cleanup (David) - blk-cgroup memory fixes (Gabriel) - nbd block size update fix (Ming) - Flush completion state fix (Ming) - bio_add_hw_page() iteration fix (Naohiro) * tag 'block-5.10-2020-10-30' of git://git.kernel.dk/linux-block: blk-mq: mark flush request as IDLE in flush_end_io() lib/scatterlist: use consistent sg_copy_buffer() return type xsysace: use platform_get_resource() and platform_get_irq_optional() null_blk: Fix locking in zoned mode null_blk: Fix zone reset all tracing nbd: don't update block size after device is started block: advance iov_iter on bio_add_hw_page failure null_blk: synchronization fix for zoned device nvmet: fix a NULL pointer dereference when tracing the flush command nvme-fc: remove nvme_fc_terminate_io() nvme-fc: eliminate terminate_io use by nvme_fc_error_recovery nvme-fc: remove err_work work item nvme-fc: track error_recovery while connecting nvme-rdma: handle unexpected nvme completion data length nvme: ignore zone validate errors on subsequent scans blk-cgroup: Pre-allocate tree node on blkg_conf_prep blk-cgroup: Fix memleak on error path
virt-dma.h
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Virtual DMA channel support for DMAengine
*
* Copyright (C) 2012 Russell King
*/
#ifndef VIRT_DMA_H
#define VIRT_DMA_H
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include "dmaengine.h"
struct virt_dma_desc {
struct dma_async_tx_descriptor tx;
struct dmaengine_result tx_result;
/* protected by vc.lock */
struct list_head node;
};
struct virt_dma_chan {
struct dma_chan chan;
struct tasklet_struct task;
void (*desc_free)(struct virt_dma_desc *);
spinlock_t lock;
/* protected by vc.lock */
struct list_head desc_allocated;
struct list_head desc_submitted;
struct list_head desc_issued;
struct list_head desc_completed;
struct list_head desc_terminated;
struct virt_dma_desc *cyclic;
};
static inline struct virt_dma_chan *to_virt_chan(struct dma_chan *chan)
{
return container_of(chan, struct virt_dma_chan, chan);
}
void vchan_dma_desc_free_list(struct virt_dma_chan *vc, struct list_head *head);
void vchan_init(struct virt_dma_chan *vc, struct dma_device *dmadev);
struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *, dma_cookie_t);
extern dma_cookie_t vchan_tx_submit(struct dma_async_tx_descriptor *);
extern int vchan_tx_desc_free(struct dma_async_tx_descriptor *);
/**
* vchan_tx_prep - prepare a descriptor
* @vc: virtual channel allocating this descriptor
* @vd: virtual descriptor to prepare
* @tx_flags: flags argument passed in to prepare function
*/
static inline struct dma_async_tx_descriptor *vchan_tx_prep(struct virt_dma_chan *vc,
struct virt_dma_desc *vd, unsigned long tx_flags)
{
unsigned long flags;
dma_async_tx_descriptor_init(&vd->tx, &vc->chan);
vd->tx.flags = tx_flags;
vd->tx.tx_submit = vchan_tx_submit;
vd->tx.desc_free = vchan_tx_desc_free;
vd->tx_result.result = DMA_TRANS_NOERROR;
vd->tx_result.residue = 0;
spin_lock_irqsave(&vc->lock, flags);
list_add_tail(&vd->node, &vc->desc_allocated);
spin_unlock_irqrestore(&vc->lock, flags);
return &vd->tx;
}
/**
* vchan_issue_pending - move submitted descriptors to issued list
* @vc: virtual channel to update
*
* vc.lock must be held by caller
*/
static inline bool vchan_issue_pending(struct virt_dma_chan *vc)
{
list_splice_tail_init(&vc->desc_submitted, &vc->desc_issued);
return !list_empty(&vc->desc_issued);
}
/**
* vchan_cookie_complete - report completion of a descriptor
* @vd: virtual descriptor to update
*
* vc.lock must be held by caller
*/
static inline void vchan_cookie_complete(struct virt_dma_desc *vd)
{
struct virt_dma_chan *vc = to_virt_chan(vd->tx.chan);
dma_cookie_t cookie;
cookie = vd->tx.cookie;
dma_cookie_complete(&vd->tx);
dev_vdbg(vc->chan.device->dev, "txd %p[%x]: marked complete\n",
vd, cookie);
list_add_tail(&vd->node, &vc->desc_completed);
tasklet_schedule(&vc->task);
}
/**
* vchan_vdesc_fini - Free or reuse a descriptor
* @vd: virtual descriptor to free/reuse
*/
static inline void vchan_vdesc_fini(struct virt_dma_desc *vd)
{
struct virt_dma_chan *vc = to_virt_chan(vd->tx.chan);
if (dmaengine_desc_test_reuse(&vd->tx)) {
unsigned long flags;
spin_lock_irqsave(&vc->lock, flags);
list_add(&vd->node, &vc->desc_allocated);
spin_unlock_irqrestore(&vc->lock, flags);
} else {
vc->desc_free(vd);
}
}
/**
* vchan_cyclic_callback - report the completion of a period
* @vd: virtual descriptor
*/
static inline void vchan_cyclic_callback(struct virt_dma_desc *vd)
{
struct virt_dma_chan *vc = to_virt_chan(vd->tx.chan);
vc->cyclic = vd;
tasklet_schedule(&vc->task);
}
/**
* vchan_terminate_vdesc - Disable pending cyclic callback
* @vd: virtual descriptor to be terminated
*
* vc.lock must be held by caller
*/
static inline void vchan_terminate_vdesc(struct virt_dma_desc *vd)
{
struct virt_dma_chan *vc = to_virt_chan(vd->tx.chan);
list_add_tail(&vd->node, &vc->desc_terminated);
if (vc->cyclic == vd)
vc->cyclic = NULL;
}
/**
* vchan_next_desc - peek at the next descriptor to be processed
* @vc: virtual channel to obtain descriptor from
*
* vc.lock must be held by caller
*/
static inline struct virt_dma_desc *vchan_next_desc(struct virt_dma_chan *vc)
{
return list_first_entry_or_null(&vc->desc_issued,
struct virt_dma_desc, node);
}
/**
* vchan_get_all_descriptors - obtain all submitted and issued descriptors
* @vc: virtual channel to get descriptors from
* @head: list of descriptors found
*
* vc.lock must be held by caller
*
* Removes all submitted and issued descriptors from internal lists, and
* provides a list of all descriptors found
*/
static inline void vchan_get_all_descriptors(struct virt_dma_chan *vc,
struct list_head *head)
{
list_splice_tail_init(&vc->desc_allocated, head);
list_splice_tail_init(&vc->desc_submitted, head);
list_splice_tail_init(&vc->desc_issued, head);
list_splice_tail_init(&vc->desc_completed, head);
list_splice_tail_init(&vc->desc_terminated, head);
}
static inline void vchan_free_chan_resources(struct virt_dma_chan *vc)
{
struct virt_dma_desc *vd;
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&vc->lock, flags);
vchan_get_all_descriptors(vc, &head);
list_for_each_entry(vd, &head, node)
dmaengine_desc_clear_reuse(&vd->tx);
spin_unlock_irqrestore(&vc->lock, flags);
vchan_dma_desc_free_list(vc, &head);
}
/**
* vchan_synchronize() - synchronize callback execution to the current context
* @vc: virtual channel to synchronize
*
* Makes sure that all scheduled or active callbacks have finished running. For
* proper operation the caller has to ensure that no new callbacks are scheduled
* after the invocation of this function started.
* Free up the terminated cyclic descriptor to prevent memory leakage.
*/
static inline void vchan_synchronize(struct virt_dma_chan *vc)
{
LIST_HEAD(head);
unsigned long flags;
tasklet_kill(&vc->task);
spin_lock_irqsave(&vc->lock, flags);
list_splice_tail_init(&vc->desc_terminated, &head);
spin_unlock_irqrestore(&vc->lock, flags);
vchan_dma_desc_free_list(vc, &head);
}
#endif
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