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From: Kishon Vijay Abraham I <kishon@ti.com>
To: Tom Joseph <tjoseph@cadence.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: devicetree@vger.kernel.org, Jingoo Han <jingoohan1@gmail.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	Kishon Vijay Abraham I <kishon@ti.com>,
	linux-rockchip@lists.infradead.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-omap@vger.kernel.org, Frank Rowand <frowand.list@gmail.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 15/30] PCI: endpoint: Replace spinlock with mutex
Date: Tue, 4 Jun 2019 18:45:01 +0530	[thread overview]
Message-ID: <20190604131516.13596-16-kishon@ti.com> (raw)
In-Reply-To: <20190604131516.13596-1-kishon@ti.com>

The pci_epc_ops is not intended to be invoked from interrupt context.
Hence replace spin_lock_irqsave and spin_unlock_irqrestore with
mutex_lock and mutex_unlock respectively.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/endpoint/pci-epc-core.c | 82 +++++++++++------------------
 include/linux/pci-epc.h             |  6 +--
 2 files changed, 34 insertions(+), 54 deletions(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 80831a874dbd..eea07f9ec5ff 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -120,7 +120,6 @@ const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
 						    u8 func_no)
 {
 	const struct pci_epc_features *epc_features;
-	unsigned long flags;
 
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return NULL;
@@ -128,9 +127,9 @@ const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
 	if (!epc->ops->get_features)
 		return NULL;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	epc_features = epc->ops->get_features(epc, func_no);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 
 	return epc_features;
 }
@@ -144,14 +143,12 @@ EXPORT_SYMBOL_GPL(pci_epc_get_features);
  */
 void pci_epc_stop(struct pci_epc *epc)
 {
-	unsigned long flags;
-
 	if (IS_ERR(epc) || !epc->ops->stop)
 		return;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	epc->ops->stop(epc);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_stop);
 
@@ -164,7 +161,6 @@ EXPORT_SYMBOL_GPL(pci_epc_stop);
 int pci_epc_start(struct pci_epc *epc)
 {
 	int ret;
-	unsigned long flags;
 
 	if (IS_ERR(epc))
 		return -EINVAL;
@@ -172,9 +168,9 @@ int pci_epc_start(struct pci_epc *epc)
 	if (!epc->ops->start)
 		return 0;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	ret = epc->ops->start(epc);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 
 	return ret;
 }
@@ -193,7 +189,6 @@ int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
 		      enum pci_epc_irq_type type, u16 interrupt_num)
 {
 	int ret;
-	unsigned long flags;
 
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return -EINVAL;
@@ -201,9 +196,9 @@ int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
 	if (!epc->ops->raise_irq)
 		return 0;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	ret = epc->ops->raise_irq(epc, func_no, type, interrupt_num);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 
 	return ret;
 }
@@ -219,7 +214,6 @@ EXPORT_SYMBOL_GPL(pci_epc_raise_irq);
 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no)
 {
 	int interrupt;
-	unsigned long flags;
 
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return 0;
@@ -227,9 +221,9 @@ int pci_epc_get_msi(struct pci_epc *epc, u8 func_no)
 	if (!epc->ops->get_msi)
 		return 0;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	interrupt = epc->ops->get_msi(epc, func_no);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 
 	if (interrupt < 0)
 		return 0;
@@ -252,7 +246,6 @@ int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts)
 {
 	int ret;
 	u8 encode_int;
-	unsigned long flags;
 
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
 	    interrupts > 32)
@@ -263,9 +256,9 @@ int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts)
 
 	encode_int = order_base_2(interrupts);
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	ret = epc->ops->set_msi(epc, func_no, encode_int);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 
 	return ret;
 }
@@ -281,7 +274,6 @@ EXPORT_SYMBOL_GPL(pci_epc_set_msi);
 int pci_epc_get_msix(struct pci_epc *epc, u8 func_no)
 {
 	int interrupt;
-	unsigned long flags;
 
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return 0;
@@ -289,9 +281,9 @@ int pci_epc_get_msix(struct pci_epc *epc, u8 func_no)
 	if (!epc->ops->get_msix)
 		return 0;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	interrupt = epc->ops->get_msix(epc, func_no);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 
 	if (interrupt < 0)
 		return 0;
@@ -311,7 +303,6 @@ EXPORT_SYMBOL_GPL(pci_epc_get_msix);
 int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts)
 {
 	int ret;
-	unsigned long flags;
 
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
 	    interrupts < 1 || interrupts > 2048)
@@ -320,9 +311,9 @@ int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts)
 	if (!epc->ops->set_msix)
 		return 0;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	ret = epc->ops->set_msix(epc, func_no, interrupts - 1);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 
 	return ret;
 }
@@ -339,17 +330,15 @@ EXPORT_SYMBOL_GPL(pci_epc_set_msix);
 void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
 			phys_addr_t phys_addr)
 {
-	unsigned long flags;
-
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return;
 
 	if (!epc->ops->unmap_addr)
 		return;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	epc->ops->unmap_addr(epc, func_no, phys_addr);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_unmap_addr);
 
@@ -367,7 +356,6 @@ int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
 		     phys_addr_t phys_addr, u64 pci_addr, size_t size)
 {
 	int ret;
-	unsigned long flags;
 
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return -EINVAL;
@@ -375,9 +363,9 @@ int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
 	if (!epc->ops->map_addr)
 		return 0;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	ret = epc->ops->map_addr(epc, func_no, phys_addr, pci_addr, size);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 
 	return ret;
 }
@@ -394,8 +382,6 @@ EXPORT_SYMBOL_GPL(pci_epc_map_addr);
 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
 		       struct pci_epf_bar *epf_bar)
 {
-	unsigned long flags;
-
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
 	    (epf_bar->barno == BAR_5 &&
 	     epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64))
@@ -404,9 +390,9 @@ void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
 	if (!epc->ops->clear_bar)
 		return;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	epc->ops->clear_bar(epc, func_no, epf_bar);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_clear_bar);
 
@@ -422,7 +408,6 @@ int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
 		    struct pci_epf_bar *epf_bar)
 {
 	int ret;
-	unsigned long irq_flags;
 	int flags = epf_bar->flags;
 
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
@@ -437,9 +422,9 @@ int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
 	if (!epc->ops->set_bar)
 		return 0;
 
-	spin_lock_irqsave(&epc->lock, irq_flags);
+	mutex_lock(&epc->lock);
 	ret = epc->ops->set_bar(epc, func_no, epf_bar);
-	spin_unlock_irqrestore(&epc->lock, irq_flags);
+	mutex_unlock(&epc->lock);
 
 	return ret;
 }
@@ -460,7 +445,6 @@ int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
 			 struct pci_epf_header *header)
 {
 	int ret;
-	unsigned long flags;
 
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 		return -EINVAL;
@@ -468,9 +452,9 @@ int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
 	if (!epc->ops->write_header)
 		return 0;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	ret = epc->ops->write_header(epc, func_no, header);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 
 	return ret;
 }
@@ -487,8 +471,6 @@ EXPORT_SYMBOL_GPL(pci_epc_write_header);
  */
 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf)
 {
-	unsigned long flags;
-
 	if (epf->epc)
 		return -EBUSY;
 
@@ -500,9 +482,9 @@ int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf)
 
 	epf->epc = epc;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	list_add_tail(&epf->list, &epc->pci_epf);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 
 	return 0;
 }
@@ -517,14 +499,12 @@ EXPORT_SYMBOL_GPL(pci_epc_add_epf);
  */
 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf)
 {
-	unsigned long flags;
-
 	if (!epc || IS_ERR(epc))
 		return;
 
-	spin_lock_irqsave(&epc->lock, flags);
+	mutex_lock(&epc->lock);
 	list_del(&epf->list);
-	spin_unlock_irqrestore(&epc->lock, flags);
+	mutex_unlock(&epc->lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_remove_epf);
 
@@ -603,7 +583,7 @@ __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 		goto err_ret;
 	}
 
-	spin_lock_init(&epc->lock);
+	mutex_init(&epc->lock);
 	INIT_LIST_HEAD(&epc->pci_epf);
 	ATOMIC_INIT_NOTIFIER_HEAD(&epc->notifier);
 
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 834dfc00aa00..a430d02aa1ff 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -88,7 +88,7 @@ struct pci_epc_mem {
  * @mem: address space of the endpoint controller
  * @max_functions: max number of functions that can be configured in this EPC
  * @group: configfs group representing the PCI EPC device
- * @lock: spinlock to protect pci_epc ops
+ * @lock: mutex to protect pci_epc ops
  * @notifier: used to notify EPF of any EPC events (like linkup)
  */
 struct pci_epc {
@@ -98,8 +98,8 @@ struct pci_epc {
 	struct pci_epc_mem		*mem;
 	u8				max_functions;
 	struct config_group		*group;
-	/* spinlock to protect against concurrent access of EP controller */
-	spinlock_t			lock;
+	/* mutex to protect against concurrent access of EP controller */
+	struct mutex			lock;
 	struct atomic_notifier_head	notifier;
 };
 
-- 
2.17.1


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  parent reply	other threads:[~2019-06-04 14:48 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-04 13:14 [RFC PATCH 00/30] Add PCIe support to TI's J721E SoC Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 01/30] dt-bindings: PCI: cadence: Add DT binding to use PCIe with IOMMU Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 02/30] dt-bindings: PCI: cadence: Add binding to reset PERST# Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 03/30] dt-bindings: PCI: cadence: Update host DT bindings with TI specific compatible Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 04/30] dt-bindings: PCI: cadence: Update EP " Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 05/30] linux/kernel.h: Add PTR_ALIGN_DOWN macro Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 06/30] PCI: cadence: Add support to use custom read and write accessors Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 07/30] PCI: cadence: Add read and write accessors to perform only 32-bit accesses Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 08/30] PCI: cadence: Add support to use PCIe in J721E SoC Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 09/30] PCI: cadence: Add platform_data to start link and check link status Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 10/30] PCI: cadence: Use *_start_link() and *_wait_for_link() to establish link Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 11/30] PCI: cadence: Add support to drive PERST# line using GPIO Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 12/30] PCI: cadence: Make "mem" an optional memory resource Kishon Vijay Abraham I
2019-06-04 13:14 ` [RFC PATCH 13/30] PCI: cadence: Use local management register to configure Vendor ID Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 14/30] PCI: endpoint: Use notification chain mechanism to notify EPC events to EPF Kishon Vijay Abraham I
2019-06-04 13:15 ` Kishon Vijay Abraham I [this message]
2019-06-04 13:15 ` [RFC PATCH 16/30] PCI: endpoint: Assign function number of each PF in EPC core Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 17/30] PCI: endpoint: Protect concurrent access to pci_epf_ops with mutex Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 18/30] PCI: endpoint: Add support to add virtual function in endpoint core Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 19/30] PCI: endpoint: Add support to link a physical function to a virtual function Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 20/30] PCI: endpoint: Add virtual function number in pci_epc ops Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 21/30] PCI: cadence: Add support to configure virtual functions Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 22/30] PCI: cadence: Configure pci_epc_features to align BAR addresses to 256 Bytes Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 23/30] of/platform: Export of_platform_device_create_pdata() Kishon Vijay Abraham I
2019-06-10 17:43   ` Rob Herring
2019-06-11  4:38     ` Kishon Vijay Abraham I
2019-07-19 10:55       ` Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 24/30] dt-bindings: PCI: J721E: Add DT bindings for PCIe controller in J721E Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 25/30] PCI: j721e: Add TI J721E PCIe driver Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 26/30] MAINTAINERS: Add MAINTAINER entry for PCIe on TI's J721E SoC Kishon Vijay Abraham I
2019-06-04 19:45   ` Bjorn Helgaas
2019-06-04 13:15 ` [RFC PATCH 27/30] misc: pci_endpoint_test: Add J721E in pci_device_id table Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 28/30] misc: pci_endpoint_test: Avoid using module parameter to determine irqtype Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 29/30] misc: pci_endpoint_test: Populate sriov_configure ops to configure SRIOV device Kishon Vijay Abraham I
2019-06-04 13:15 ` [RFC PATCH 30/30] misc: pci_endpoint_test: Enable legacy interrupt Kishon Vijay Abraham I

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