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dmaengine: ioatdma: adding shutdown support
The ioatdma needs to be queisced and block all additional op submission during reboots. When NET_DMA was used, this caused issue as ops were still being sent to ioatdma during reboots even though PCI BME has been turned off. Even though NET_DMA has been deprecated, we need to prevent similar situations. The shutdown handler should address that. Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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6ff33f3902
commit
ad4a7b5065
4 changed files with 66 additions and 3 deletions
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@ -197,7 +197,8 @@ static void __ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
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void ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
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{
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spin_lock_bh(&ioat_chan->prep_lock);
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__ioat_start_null_desc(ioat_chan);
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if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
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__ioat_start_null_desc(ioat_chan);
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spin_unlock_bh(&ioat_chan->prep_lock);
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}
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@ -82,8 +82,9 @@ struct ioatdma_device {
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struct dma_pool *sed_hw_pool[MAX_SED_POOLS];
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struct dma_device dma_dev;
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u8 version;
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struct msix_entry msix_entries[4];
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struct ioatdma_chan *idx[4];
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#define IOAT_MAX_CHANS 4
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struct msix_entry msix_entries[IOAT_MAX_CHANS];
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struct ioatdma_chan *idx[IOAT_MAX_CHANS];
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struct dca_provider *dca;
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enum ioat_irq_mode irq_mode;
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u32 cap;
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@ -95,6 +96,7 @@ struct ioatdma_chan {
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dma_addr_t last_completion;
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spinlock_t cleanup_lock;
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unsigned long state;
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#define IOAT_CHAN_DOWN 0
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#define IOAT_COMPLETION_ACK 1
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#define IOAT_RESET_PENDING 2
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#define IOAT_KOBJ_INIT_FAIL 3
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@ -1186,6 +1186,31 @@ static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
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return 0;
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}
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static void ioat_shutdown(struct pci_dev *pdev)
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{
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struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
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struct ioatdma_chan *ioat_chan;
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int i;
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if (!ioat_dma)
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return;
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for (i = 0; i < IOAT_MAX_CHANS; i++) {
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ioat_chan = ioat_dma->idx[i];
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if (!ioat_chan)
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continue;
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spin_lock_bh(&ioat_chan->prep_lock);
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set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
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del_timer_sync(&ioat_chan->timer);
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spin_unlock_bh(&ioat_chan->prep_lock);
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/* this should quiesce then reset */
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ioat_reset_hw(ioat_chan);
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}
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ioat_disable_interrupts(ioat_dma);
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}
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#define DRV_NAME "ioatdma"
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static struct pci_driver ioat_pci_driver = {
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@ -1193,6 +1218,7 @@ static struct pci_driver ioat_pci_driver = {
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.id_table = ioat_pci_tbl,
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.probe = ioat_pci_probe,
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.remove = ioat_remove,
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.shutdown = ioat_shutdown,
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};
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static struct ioatdma_device *
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@ -121,6 +121,9 @@ ioat_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest,
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size_t total_len = len;
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int num_descs, idx, i;
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if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
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return NULL;
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num_descs = ioat_xferlen_to_descs(ioat_chan, len);
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if (likely(num_descs) &&
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ioat_check_space_lock(ioat_chan, num_descs) == 0)
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@ -254,6 +257,11 @@ struct dma_async_tx_descriptor *
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ioat_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
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unsigned int src_cnt, size_t len, unsigned long flags)
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{
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struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
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if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
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return NULL;
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return __ioat_prep_xor_lock(chan, NULL, dest, src, src_cnt, len, flags);
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}
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@ -262,6 +270,11 @@ ioat_prep_xor_val(struct dma_chan *chan, dma_addr_t *src,
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unsigned int src_cnt, size_t len,
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enum sum_check_flags *result, unsigned long flags)
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{
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struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
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if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
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return NULL;
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/* the cleanup routine only sets bits on validate failure, it
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* does not clear bits on validate success... so clear it here
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*/
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@ -574,6 +587,11 @@ ioat_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
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unsigned int src_cnt, const unsigned char *scf, size_t len,
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unsigned long flags)
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{
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struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
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if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
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return NULL;
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/* specify valid address for disabled result */
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if (flags & DMA_PREP_PQ_DISABLE_P)
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dst[0] = dst[1];
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@ -614,6 +632,11 @@ ioat_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
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unsigned int src_cnt, const unsigned char *scf, size_t len,
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enum sum_check_flags *pqres, unsigned long flags)
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{
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struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
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if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
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return NULL;
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/* specify valid address for disabled result */
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if (flags & DMA_PREP_PQ_DISABLE_P)
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pq[0] = pq[1];
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@ -638,6 +661,10 @@ ioat_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
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{
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unsigned char scf[MAX_SCF];
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dma_addr_t pq[2];
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struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
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if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
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return NULL;
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if (src_cnt > MAX_SCF)
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return NULL;
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@ -661,6 +688,10 @@ ioat_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,
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{
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unsigned char scf[MAX_SCF];
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dma_addr_t pq[2];
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struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
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if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
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return NULL;
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if (src_cnt > MAX_SCF)
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return NULL;
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@ -689,6 +720,9 @@ ioat_prep_interrupt_lock(struct dma_chan *c, unsigned long flags)
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struct ioat_ring_ent *desc;
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struct ioat_dma_descriptor *hw;
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if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
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return NULL;
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if (ioat_check_space_lock(ioat_chan, 1) == 0)
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desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head);
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else
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