dmaengine fixes for v5.14

Bunch of driver fixes, notably:
  - idxd driver fixes for submission race, driver remove sequence, setup
    sequence for MSIXPERM, array index and updating descriptor vector
  - usb-dmac, pm reference leak fix
  - xilinx_dma, read-after-free fix
  - uniphier-xdmac fix for using atomic readl_poll_timeout_atomic()
  - of-dma, router_xlate to return
  - imx-dma, generic dma fix
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Merge tag 'dmaengine-fix-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine

Pull dmaengine fixes from Vinod Koul:
 "A bunch of driver fixes, notably:

   - idxd driver fixes for submission race, driver remove sequence,
     setup sequence for MSIXPERM, array index and updating descriptor
     vector

   - usb-dmac, pm reference leak fix

   - xilinx_dma, read-after-free fix

   - uniphier-xdmac fix for using atomic readl_poll_timeout_atomic()

   - of-dma, router_xlate to return

   - imx-dma, generic dma fix"

* tag 'dmaengine-fix-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine:
  dmaengine: imx-dma: configure the generic DMA type to make it work
  dmaengine: of-dma: router_xlate to return -EPROBE_DEFER if controller is not yet available
  dmaengine: stm32-dmamux: Fix PM usage counter unbalance in stm32 dmamux ops
  dmaengine: stm32-dma: Fix PM usage counter imbalance in stm32 dma ops
  dmaengine: uniphier-xdmac: Use readl_poll_timeout_atomic() in atomic state
  dmaengine: idxd: fix submission race window
  dmaengine: idxd: fix sequence for pci driver remove() and shutdown()
  dmaengine: idxd: fix desc->vector that isn't being updated
  dmaengine: idxd: fix setup sequence for MSIXPERM table
  dmaengine: idxd: fix array index when int_handles are being used
  dmaengine: usb-dmac: Fix PM reference leak in usb_dmac_probe()
  dmaengine: xilinx_dma: Fix read-after-free bug when terminating transfers

drivers/dma/idxd/idxd.h

@@ -294,6 +294,14 @@ struct idxd_desc {
 	struct idxd_wq *wq;
 };
 
+/*
+ * This is software defined error for the completion status. We overload the error code
+ * that will never appear in completion status and only SWERR register.
+ */
+enum idxd_completion_status {
+	IDXD_COMP_DESC_ABORT = 0xff,
+};
+
 #define confdev_to_idxd(dev) container_of(dev, struct idxd_device, conf_dev)
 #define confdev_to_wq(dev) container_of(dev, struct idxd_wq, conf_dev)
 
@@ -482,4 +490,10 @@ static inline void perfmon_init(void) {}
 static inline void perfmon_exit(void) {}
 #endif
 
+static inline void complete_desc(struct idxd_desc *desc, enum idxd_complete_type reason)
+{
+	idxd_dma_complete_txd(desc, reason);
+	idxd_free_desc(desc->wq, desc);
+}
+
 #endif

drivers/dma/idxd/init.c

@@ -102,6 +102,8 @@ static int idxd_setup_interrupts(struct idxd_device *idxd)
 		spin_lock_init(&idxd->irq_entries[i].list_lock);
 	}
 
+	idxd_msix_perm_setup(idxd);
+
 	irq_entry = &idxd->irq_entries[0];
 	rc = request_threaded_irq(irq_entry->vector, NULL, idxd_misc_thread,
 				  0, "idxd-misc", irq_entry);
@@ -148,7 +150,6 @@ static int idxd_setup_interrupts(struct idxd_device *idxd)
 	}
 
 	idxd_unmask_error_interrupts(idxd);
-	idxd_msix_perm_setup(idxd);
 	return 0;
 
  err_wq_irqs:
@@ -162,6 +163,7 @@ static int idxd_setup_interrupts(struct idxd_device *idxd)
  err_misc_irq:
 	/* Disable error interrupt generation */
 	idxd_mask_error_interrupts(idxd);
+	idxd_msix_perm_clear(idxd);
  err_irq_entries:
 	pci_free_irq_vectors(pdev);
 	dev_err(dev, "No usable interrupts\n");
@@ -758,32 +760,40 @@ static void idxd_shutdown(struct pci_dev *pdev)
 	for (i = 0; i < msixcnt; i++) {
 		irq_entry = &idxd->irq_entries[i];
 		synchronize_irq(irq_entry->vector);
-		free_irq(irq_entry->vector, irq_entry);
 		if (i == 0)
 			continue;
 		idxd_flush_pending_llist(irq_entry);
 		idxd_flush_work_list(irq_entry);
 	}
-
-	idxd_msix_perm_clear(idxd);
-	idxd_release_int_handles(idxd);
-	pci_free_irq_vectors(pdev);
-	pci_iounmap(pdev, idxd->reg_base);
-	pci_disable_device(pdev);
-	destroy_workqueue(idxd->wq);
+	flush_workqueue(idxd->wq);
 }
 
 static void idxd_remove(struct pci_dev *pdev)
 {
 	struct idxd_device *idxd = pci_get_drvdata(pdev);
+	struct idxd_irq_entry *irq_entry;
+	int msixcnt = pci_msix_vec_count(pdev);
+	int i;
 
 	dev_dbg(&pdev->dev, "%s called\n", __func__);
 	idxd_shutdown(pdev);
 	if (device_pasid_enabled(idxd))
 		idxd_disable_system_pasid(idxd);
 	idxd_unregister_devices(idxd);
-	perfmon_pmu_remove(idxd);
+
+	for (i = 0; i < msixcnt; i++) {
+		irq_entry = &idxd->irq_entries[i];
+		free_irq(irq_entry->vector, irq_entry);
+	}
+	idxd_msix_perm_clear(idxd);
+	idxd_release_int_handles(idxd);
+	pci_free_irq_vectors(pdev);
+	pci_iounmap(pdev, idxd->reg_base);
 	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
+	pci_disable_device(pdev);
+	destroy_workqueue(idxd->wq);
+	perfmon_pmu_remove(idxd);
+	device_unregister(&idxd->conf_dev);
 }
 
 static struct pci_driver idxd_pci_driver = {

drivers/dma/idxd/irq.c

@@ -245,12 +245,6 @@ static inline bool match_fault(struct idxd_desc *desc, u64 fault_addr)
 	return false;
 }
 
-static inline void complete_desc(struct idxd_desc *desc, enum idxd_complete_type reason)
-{
-	idxd_dma_complete_txd(desc, reason);
-	idxd_free_desc(desc->wq, desc);
-}
-
 static int irq_process_pending_llist(struct idxd_irq_entry *irq_entry,
 				     enum irq_work_type wtype,
 				     int *processed, u64 data)
@@ -272,8 +266,16 @@ static int irq_process_pending_llist(struct idxd_irq_entry *irq_entry,
 		reason = IDXD_COMPLETE_DEV_FAIL;
 
 	llist_for_each_entry_safe(desc, t, head, llnode) {
-		if (desc->completion->status) {
-			if ((desc->completion->status & DSA_COMP_STATUS_MASK) != DSA_COMP_SUCCESS)
+		u8 status = desc->completion->status & DSA_COMP_STATUS_MASK;
+
+		if (status) {
+			if (unlikely(status == IDXD_COMP_DESC_ABORT)) {
+				complete_desc(desc, IDXD_COMPLETE_ABORT);
+				(*processed)++;
+				continue;
+			}
+
+			if (unlikely(status != DSA_COMP_SUCCESS))
 				match_fault(desc, data);
 			complete_desc(desc, reason);
 			(*processed)++;
@@ -329,7 +331,14 @@ static int irq_process_work_list(struct idxd_irq_entry *irq_entry,
 	spin_unlock_irqrestore(&irq_entry->list_lock, flags);
 
 	list_for_each_entry(desc, &flist, list) {
-		if ((desc->completion->status & DSA_COMP_STATUS_MASK) != DSA_COMP_SUCCESS)
+		u8 status = desc->completion->status & DSA_COMP_STATUS_MASK;
+
+		if (unlikely(status == IDXD_COMP_DESC_ABORT)) {
+			complete_desc(desc, IDXD_COMPLETE_ABORT);
+			continue;
+		}
+
+		if (unlikely(status != DSA_COMP_SUCCESS))
 			match_fault(desc, data);
 		complete_desc(desc, reason);
 	}

drivers/dma/idxd/submit.c

@@ -25,11 +25,10 @@ static struct idxd_desc *__get_desc(struct idxd_wq *wq, int idx, int cpu)
 	 * Descriptor completion vectors are 1...N for MSIX. We will round
 	 * robin through the N vectors.
 	 */
-	wq->vec_ptr = (wq->vec_ptr % idxd->num_wq_irqs) + 1;
+	wq->vec_ptr = desc->vector = (wq->vec_ptr % idxd->num_wq_irqs) + 1;
 	if (!idxd->int_handles) {
 		desc->hw->int_handle = wq->vec_ptr;
 	} else {
-		desc->vector = wq->vec_ptr;
 		/*
 		 * int_handles are only for descriptor completion. However for device
 		 * MSIX enumeration, vec 0 is used for misc interrupts. Therefore even
@@ -88,9 +87,64 @@ void idxd_free_desc(struct idxd_wq *wq, struct idxd_desc *desc)
 	sbitmap_queue_clear(&wq->sbq, desc->id, cpu);
 }
 
+static struct idxd_desc *list_abort_desc(struct idxd_wq *wq, struct idxd_irq_entry *ie,
+					 struct idxd_desc *desc)
+{
+	struct idxd_desc *d, *n;
+
+	lockdep_assert_held(&ie->list_lock);
+	list_for_each_entry_safe(d, n, &ie->work_list, list) {
+		if (d == desc) {
+			list_del(&d->list);
+			return d;
+		}
+	}
+
+	/*
+	 * At this point, the desc needs to be aborted is held by the completion
+	 * handler where it has taken it off the pending list but has not added to the
+	 * work list. It will be cleaned up by the interrupt handler when it sees the
+	 * IDXD_COMP_DESC_ABORT for completion status.
+	 */
+	return NULL;
+}
+
+static void llist_abort_desc(struct idxd_wq *wq, struct idxd_irq_entry *ie,
+			     struct idxd_desc *desc)
+{
+	struct idxd_desc *d, *t, *found = NULL;
+	struct llist_node *head;
+	unsigned long flags;
+
+	desc->completion->status = IDXD_COMP_DESC_ABORT;
+	/*
+	 * Grab the list lock so it will block the irq thread handler. This allows the
+	 * abort code to locate the descriptor need to be aborted.
+	 */
+	spin_lock_irqsave(&ie->list_lock, flags);
+	head = llist_del_all(&ie->pending_llist);
+	if (head) {
+		llist_for_each_entry_safe(d, t, head, llnode) {
+			if (d == desc) {
+				found = desc;
+				continue;
+			}
+			list_add_tail(&desc->list, &ie->work_list);
+		}
+	}
+
+	if (!found)
+		found = list_abort_desc(wq, ie, desc);
+	spin_unlock_irqrestore(&ie->list_lock, flags);
+
+	if (found)
+		complete_desc(found, IDXD_COMPLETE_ABORT);
+}
+
 int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc)
 {
 	struct idxd_device *idxd = wq->idxd;
+	struct idxd_irq_entry *ie = NULL;
 	void __iomem *portal;
 	int rc;
 
@@ -108,6 +162,16 @@ int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc)
 	 * even on UP because the recipient is a device.
 	 */
 	wmb();
+
+	/*
+	 * Pending the descriptor to the lockless list for the irq_entry
+	 * that we designated the descriptor to.
+	 */
+	if (desc->hw->flags & IDXD_OP_FLAG_RCI) {
+		ie = &idxd->irq_entries[desc->vector];
+		llist_add(&desc->llnode, &ie->pending_llist);
+	}
+
 	if (wq_dedicated(wq)) {
 		iosubmit_cmds512(portal, desc->hw, 1);
 	} else {
@@ -118,29 +182,13 @@ int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc)
 		 * device is not accepting descriptor at all.
 		 */
 		rc = enqcmds(portal, desc->hw);
-		if (rc < 0)
+		if (rc < 0) {
+			if (ie)
+				llist_abort_desc(wq, ie, desc);
 			return rc;
+		}
 	}
 
 	percpu_ref_put(&wq->wq_active);
-
-	/*
-	 * Pending the descriptor to the lockless list for the irq_entry
-	 * that we designated the descriptor to.
-	 */
-	if (desc->hw->flags & IDXD_OP_FLAG_RCI) {
-		int vec;
-
-		/*
-		 * If the driver is on host kernel, it would be the value
-		 * assigned to interrupt handle, which is index for MSIX
-		 * vector. If it's guest then can't use the int_handle since
-		 * that is the index to IMS for the entire device. The guest
-		 * device local index will be used.
-		 */
-		vec = !idxd->int_handles ? desc->hw->int_handle : desc->vector;
-		llist_add(&desc->llnode, &idxd->irq_entries[vec].pending_llist);
-	}
-
 	return 0;
 }

drivers/dma/idxd/sysfs.c

@@ -1744,8 +1744,6 @@ void idxd_unregister_devices(struct idxd_device *idxd)
 
 		device_unregister(&group->conf_dev);
 	}
-
-	device_unregister(&idxd->conf_dev);
 }
 
 int idxd_register_bus_type(void)

drivers/dma/imx-dma.c

@@ -812,6 +812,8 @@ static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
 		dma_length += sg_dma_len(sg);
 	}
 
+	imxdma_config_write(chan, &imxdmac->config, direction);
+
 	switch (imxdmac->word_size) {
 	case DMA_SLAVE_BUSWIDTH_4_BYTES:
 		if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)

drivers/dma/of-dma.c

@@ -67,8 +67,12 @@ static struct dma_chan *of_dma_router_xlate(struct of_phandle_args *dma_spec,
 		return NULL;
 
 	ofdma_target = of_dma_find_controller(&dma_spec_target);
-	if (!ofdma_target)
-		return NULL;
+	if (!ofdma_target) {
+		ofdma->dma_router->route_free(ofdma->dma_router->dev,
+					      route_data);
+		chan = ERR_PTR(-EPROBE_DEFER);
+		goto err;
+	}
 
 	chan = ofdma_target->of_dma_xlate(&dma_spec_target, ofdma_target);
 	if (IS_ERR_OR_NULL(chan)) {
@@ -89,6 +93,7 @@ static struct dma_chan *of_dma_router_xlate(struct of_phandle_args *dma_spec,
 		}
 	}
 
+err:
 	/*
 	 * Need to put the node back since the ofdma->of_dma_route_allocate
 	 * has taken it for generating the new, translated dma_spec

drivers/dma/sh/usb-dmac.c

@@ -855,8 +855,8 @@ static int usb_dmac_probe(struct platform_device *pdev)
 
 error:
 	of_dma_controller_free(pdev->dev.of_node);
-	pm_runtime_put(&pdev->dev);
 error_pm:
+	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	return ret;
 }

drivers/dma/stm32-dma.c

@@ -1200,7 +1200,7 @@ static int stm32_dma_alloc_chan_resources(struct dma_chan *c)
 
 	chan->config_init = false;
 
-	ret = pm_runtime_get_sync(dmadev->ddev.dev);
+	ret = pm_runtime_resume_and_get(dmadev->ddev.dev);
 	if (ret < 0)
 		return ret;
 
@@ -1470,7 +1470,7 @@ static int stm32_dma_suspend(struct device *dev)
 	struct stm32_dma_device *dmadev = dev_get_drvdata(dev);
 	int id, ret, scr;
 
-	ret = pm_runtime_get_sync(dev);
+	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0)
 		return ret;
 

drivers/dma/stm32-dmamux.c

@@ -137,7 +137,7 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec,
 
 	/* Set dma request */
 	spin_lock_irqsave(&dmamux->lock, flags);
-	ret = pm_runtime_get_sync(&pdev->dev);
+	ret = pm_runtime_resume_and_get(&pdev->dev);
 	if (ret < 0) {
 		spin_unlock_irqrestore(&dmamux->lock, flags);
 		goto error;
@@ -336,7 +336,7 @@ static int stm32_dmamux_suspend(struct device *dev)
 	struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
 	int i, ret;
 
-	ret = pm_runtime_get_sync(dev);
+	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0)
 		return ret;
 
@@ -361,7 +361,7 @@ static int stm32_dmamux_resume(struct device *dev)
 	if (ret < 0)
 		return ret;
 
-	ret = pm_runtime_get_sync(dev);
+	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0)
 		return ret;
 

drivers/dma/uniphier-xdmac.c

@@ -209,8 +209,8 @@ static int uniphier_xdmac_chan_stop(struct uniphier_xdmac_chan *xc)
 	writel(0, xc->reg_ch_base + XDMAC_TSS);
 
 	/* wait until transfer is stopped */
-	return readl_poll_timeout(xc->reg_ch_base + XDMAC_STAT, val,
-				  !(val & XDMAC_STAT_TENF), 100, 1000);
+	return readl_poll_timeout_atomic(xc->reg_ch_base + XDMAC_STAT, val,
+					 !(val & XDMAC_STAT_TENF), 100, 1000);
 }
 
 /* xc->vc.lock must be held by caller */

drivers/dma/xilinx/xilinx_dma.c

@@ -394,6 +394,7 @@ struct xilinx_dma_tx_descriptor {
  * @genlock: Support genlock mode
  * @err: Channel has errors
  * @idle: Check for channel idle
+ * @terminating: Check for channel being synchronized by user
  * @tasklet: Cleanup work after irq
  * @config: Device configuration info
  * @flush_on_fsync: Flush on Frame sync
@@ -431,6 +432,7 @@ struct xilinx_dma_chan {
 	bool genlock;
 	bool err;
 	bool idle;
+	bool terminating;
 	struct tasklet_struct tasklet;
 	struct xilinx_vdma_config config;
 	bool flush_on_fsync;
@@ -1049,6 +1051,13 @@ static void xilinx_dma_chan_desc_cleanup(struct xilinx_dma_chan *chan)
 		/* Run any dependencies, then free the descriptor */
 		dma_run_dependencies(&desc->async_tx);
 		xilinx_dma_free_tx_descriptor(chan, desc);
+
+		/*
+		 * While we ran a callback the user called a terminate function,
+		 * which takes care of cleaning up any remaining descriptors
+		 */
+		if (chan->terminating)
+			break;
 	}
 
 	spin_unlock_irqrestore(&chan->lock, flags);
@@ -1965,6 +1974,8 @@ static dma_cookie_t xilinx_dma_tx_submit(struct dma_async_tx_descriptor *tx)
 	if (desc->cyclic)
 		chan->cyclic = true;
 
+	chan->terminating = false;
+
 	spin_unlock_irqrestore(&chan->lock, flags);
 
 	return cookie;
@@ -2436,6 +2447,7 @@ static int xilinx_dma_terminate_all(struct dma_chan *dchan)
 
 	xilinx_dma_chan_reset(chan);
 	/* Remove and free all of the descriptors in the lists */
+	chan->terminating = true;
 	xilinx_dma_free_descriptors(chan);
 	chan->idle = true;