Merge branch 'pci/controller/endpoint'

- Change "PCI Endpoint Virtual NTB driver" Kconfig prompt to be different
  from "PCI Endpoint NTB driver" (Shunsuke Mie)

- Automatically create a function specific attributes group for endpoint
  drivers to avoid reference counting issues (Damien Le Moal)

- Move and unexport pci_epf_type_add_cfs() (Damien Le Moal)

- Reinitialize EPF test DMA transfer completion before submitting it to
  avoid losing the completion notification (Damien Le Moal)

- Fix EPF test DMA transfer completion detection (Damien Le Moal)

- Submit EPF test DMA transfers with dmaengine_submit(), not tx_submit()
  (Damien Le Moal)

- Simplify EPF test read/write/copy functions (Damien Le Moal)

- Simplify EPF test "raise IRQ" interface (Damien Le Moal)

- Simplify EPF test IRQ command execution (Damien Le Moal)

- Improve EPF test command/status register handling (Damien Le Moal)

- Free IRQs before removing device (Damien Le Moal)

- Reinitialize IRQ completions for every test (Damien Le Moal)

- Don't write status in IRQ handler to avoid race (Damien Le Moal)

- Fix dma_chan direction in data transfer test (Yoshihiro Shimoda)

- Return pci_epf_type_add_cfs() error if EPF has no driver (Damien Le Moal)

- Add kernel-doc for pci_epc_raise_irq() and pci_epc_map_msi_irq() MSI
  vector parameters (Manivannan Sadhasivam)

- Pass EPF device ID to driver probe functions (Manivannan Sadhasivam)

- Return -EALREADY if EPC has already been started/stopped (Manivannan
  Sadhasivam)

- Add linkdown notifier support and use it in qcom-ep (Manivannan
  Sadhasivam)

- Add Bus Master Enable event support and use it in qcom-ep (Manivannan
  Sadhasivam)

- Add Qualcomm Modem Host Interface (MHI) endpoint driver (Manivannan
  Sadhasivam)

- Add Layerscape PME interrupt handling to manage link-up notification
  (Frank Li)

* pci/controller/endpoint:
  PCI: layerscape: Add the endpoint linkup notifier support
  PCI: endpoint: pci-epf-vntb: Fix typo in comments
  MAINTAINERS: Add PCI MHI endpoint function driver under MHI bus
  PCI: endpoint: Add PCI Endpoint function driver for MHI bus
  PCI: qcom-ep: Add support for BME notification
  PCI: qcom-ep: Add support for Link down notification
  PCI: endpoint: Add BME notifier support
  PCI: endpoint: Add linkdown notifier support
  PCI: endpoint: Return error if EPC is started/stopped multiple times
  PCI: endpoint: Pass EPF device ID to the probe function
  PCI: endpoint: Add missing documentation about the MSI/MSI-X range
  PCI: endpoint: Improve pci_epf_type_add_cfs()
  PCI: endpoint: functions/pci-epf-test: Fix dma_chan direction
  misc: pci_endpoint_test: Simplify pci_endpoint_test_msi_irq()
  misc: pci_endpoint_test: Do not write status in IRQ handler
  misc: pci_endpoint_test: Re-init completion for every test
  misc: pci_endpoint_test: Free IRQs before removing the device
  PCI: epf-test: Simplify transfers result print
  PCI: epf-test: Simplify DMA support checks
  PCI: epf-test: Cleanup request result handling
  PCI: epf-test: Cleanup pci_epf_test_cmd_handler()
  PCI: epf-test: Improve handling of command and status registers
  PCI: epf-test: Simplify IRQ test commands execution
  PCI: epf-test: Simplify pci_epf_test_raise_irq()
  PCI: epf-test: Simplify read/write/copy test functions
  PCI: epf-test: Use dmaengine_submit() to initiate DMA transfer
  PCI: epf-test: Fix DMA transfer completion detection
  PCI: epf-test: Fix DMA transfer completion initialization
  PCI: endpoint: Move pci_epf_type_add_cfs() code
  PCI: endpoint: Automatically create a function specific attributes group
  PCI: endpoint: Fix a Kconfig prompt of vNTB driver

Author: bjorn-helgaas

Documentation/PCI/endpoint/pci-ntb-howto.rst

@@ -88,13 +88,10 @@ commands can be used::
 	# echo 0x104c > functions/pci_epf_ntb/func1/vendorid
 	# echo 0xb00d > functions/pci_epf_ntb/func1/deviceid
 
-In order to configure NTB specific attributes, a new sub-directory to func1
-should be created::
-
-	# mkdir functions/pci_epf_ntb/func1/pci_epf_ntb.0/
-
-The NTB function driver will populate this directory with various attributes
-that can be configured by the user::
+The PCI endpoint framework also automatically creates a sub-directory in the
+function attribute directory. This sub-directory has the same name as the name
+of the function device and is populated with the following NTB specific
+attributes that can be configured by the user::
 
 	# ls functions/pci_epf_ntb/func1/pci_epf_ntb.0/
 	db_count    mw1         mw2         mw3         mw4         num_mws

Documentation/PCI/endpoint/pci-vntb-howto.rst

@@ -84,13 +84,10 @@ commands can be used::
 	# echo 0x1957 > functions/pci_epf_vntb/func1/vendorid
 	# echo 0x0809 > functions/pci_epf_vntb/func1/deviceid
 
-In order to configure NTB specific attributes, a new sub-directory to func1
-should be created::
-
-	# mkdir functions/pci_epf_vntb/func1/pci_epf_vntb.0/
-
-The NTB function driver will populate this directory with various attributes
-that can be configured by the user::
+The PCI endpoint framework also automatically creates a sub-directory in the
+function attribute directory. This sub-directory has the same name as the name
+of the function device and is populated with the following NTB specific
+attributes that can be configured by the user::
 
 	# ls functions/pci_epf_vntb/func1/pci_epf_vntb.0/
 	db_count    mw1         mw2         mw3         mw4         num_mws

MAINTAINERS

@@ -13629,6 +13629,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mani/mhi.git
 F:	Documentation/ABI/stable/sysfs-bus-mhi
 F:	Documentation/mhi/
 F:	drivers/bus/mhi/
+F:	drivers/pci/endpoint/functions/pci-epf-mhi.c
 F:	include/linux/mhi.h
 
 MICROBLAZE ARCHITECTURE

drivers/misc/pci_endpoint_test.c

@@ -159,10 +159,7 @@ static irqreturn_t pci_endpoint_test_irqhandler(int irq, void *dev_id)
 	if (reg & STATUS_IRQ_RAISED) {
 		test->last_irq = irq;
 		complete(&test->irq_raised);
-		reg &= ~STATUS_IRQ_RAISED;
 	}
-	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_STATUS,
-				 reg);
 
 	return IRQ_HANDLED;
 }
@@ -316,21 +313,17 @@ static bool pci_endpoint_test_msi_irq(struct pci_endpoint_test *test,
 	struct pci_dev *pdev = test->pdev;
 
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
-				 msix == false ? IRQ_TYPE_MSI :
-				 IRQ_TYPE_MSIX);
+				 msix ? IRQ_TYPE_MSIX : IRQ_TYPE_MSI);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, msi_num);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
-				 msix == false ? COMMAND_RAISE_MSI_IRQ :
-				 COMMAND_RAISE_MSIX_IRQ);
+				 msix ? COMMAND_RAISE_MSIX_IRQ :
+				 COMMAND_RAISE_MSI_IRQ);
 	val = wait_for_completion_timeout(&test->irq_raised,
 					  msecs_to_jiffies(1000));
 	if (!val)
 		return false;
 
-	if (pci_irq_vector(pdev, msi_num - 1) == test->last_irq)
-		return true;
-
-	return false;
+	return pci_irq_vector(pdev, msi_num - 1) == test->last_irq;
 }
 
 static int pci_endpoint_test_validate_xfer_params(struct device *dev,
@@ -729,6 +722,10 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
 	struct pci_dev *pdev = test->pdev;
 
 	mutex_lock(&test->mutex);
+
+	reinit_completion(&test->irq_raised);
+	test->last_irq = -ENODATA;
+
 	switch (cmd) {
 	case PCITEST_BAR:
 		bar = arg;
@@ -938,6 +935,9 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
 	if (id < 0)
 		return;
 
+	pci_endpoint_test_release_irq(test);
+	pci_endpoint_test_free_irq_vectors(test);
+
 	misc_deregister(&test->miscdev);
 	kfree(misc_device->name);
 	kfree(test->name);
@@ -947,9 +947,6 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
 			pci_iounmap(pdev, test->bar[bar]);
 	}
 
-	pci_endpoint_test_release_irq(test);
-	pci_endpoint_test_free_irq_vectors(test);
-
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 }

drivers/pci/controller/dwc/pci-layerscape-ep.c

@@ -18,6 +18,20 @@
 
 #include "pcie-designware.h"
 
+#define PEX_PF0_CONFIG			0xC0014
+#define PEX_PF0_CFG_READY		BIT(0)
+
+/* PEX PFa PCIE PME and message interrupt registers*/
+#define PEX_PF0_PME_MES_DR		0xC0020
+#define PEX_PF0_PME_MES_DR_LUD		BIT(7)
+#define PEX_PF0_PME_MES_DR_LDD		BIT(9)
+#define PEX_PF0_PME_MES_DR_HRD		BIT(10)
+
+#define PEX_PF0_PME_MES_IER		0xC0028
+#define PEX_PF0_PME_MES_IER_LUDIE	BIT(7)
+#define PEX_PF0_PME_MES_IER_LDDIE	BIT(9)
+#define PEX_PF0_PME_MES_IER_HRDIE	BIT(10)
+
 #define to_ls_pcie_ep(x)	dev_get_drvdata((x)->dev)
 
 struct ls_pcie_ep_drvdata {
@@ -30,8 +44,84 @@ struct ls_pcie_ep {
 	struct dw_pcie			*pci;
 	struct pci_epc_features		*ls_epc;
 	const struct ls_pcie_ep_drvdata *drvdata;
+	int				irq;
+	bool				big_endian;
 };
 
+static u32 ls_lut_readl(struct ls_pcie_ep *pcie, u32 offset)
+{
+	struct dw_pcie *pci = pcie->pci;
+
+	if (pcie->big_endian)
+		return ioread32be(pci->dbi_base + offset);
+	else
+		return ioread32(pci->dbi_base + offset);
+}
+
+static void ls_lut_writel(struct ls_pcie_ep *pcie, u32 offset, u32 value)
+{
+	struct dw_pcie *pci = pcie->pci;
+
+	if (pcie->big_endian)
+		iowrite32be(value, pci->dbi_base + offset);
+	else
+		iowrite32(value, pci->dbi_base + offset);
+}
+
+static irqreturn_t ls_pcie_ep_event_handler(int irq, void *dev_id)
+{
+	struct ls_pcie_ep *pcie = dev_id;
+	struct dw_pcie *pci = pcie->pci;
+	u32 val, cfg;
+
+	val = ls_lut_readl(pcie, PEX_PF0_PME_MES_DR);
+	ls_lut_writel(pcie, PEX_PF0_PME_MES_DR, val);
+
+	if (!val)
+		return IRQ_NONE;
+
+	if (val & PEX_PF0_PME_MES_DR_LUD) {
+		cfg = ls_lut_readl(pcie, PEX_PF0_CONFIG);
+		cfg |= PEX_PF0_CFG_READY;
+		ls_lut_writel(pcie, PEX_PF0_CONFIG, cfg);
+		dw_pcie_ep_linkup(&pci->ep);
+
+		dev_dbg(pci->dev, "Link up\n");
+	} else if (val & PEX_PF0_PME_MES_DR_LDD) {
+		dev_dbg(pci->dev, "Link down\n");
+	} else if (val & PEX_PF0_PME_MES_DR_HRD) {
+		dev_dbg(pci->dev, "Hot reset\n");
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int ls_pcie_ep_interrupt_init(struct ls_pcie_ep *pcie,
+				     struct platform_device *pdev)
+{
+	u32 val;
+	int ret;
+
+	pcie->irq = platform_get_irq_byname(pdev, "pme");
+	if (pcie->irq < 0)
+		return pcie->irq;
+
+	ret = devm_request_irq(&pdev->dev, pcie->irq, ls_pcie_ep_event_handler,
+			       IRQF_SHARED, pdev->name, pcie);
+	if (ret) {
+		dev_err(&pdev->dev, "Can't register PCIe IRQ\n");
+		return ret;
+	}
+
+	/* Enable interrupts */
+	val = ls_lut_readl(pcie, PEX_PF0_PME_MES_IER);
+	val |=  PEX_PF0_PME_MES_IER_LDDIE | PEX_PF0_PME_MES_IER_HRDIE |
+		PEX_PF0_PME_MES_IER_LUDIE;
+	ls_lut_writel(pcie, PEX_PF0_PME_MES_IER, val);
+
+	return 0;
+}
+
 static const struct pci_epc_features*
 ls_pcie_ep_get_features(struct dw_pcie_ep *ep)
 {
@@ -125,6 +215,7 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
 	struct ls_pcie_ep *pcie;
 	struct pci_epc_features *ls_epc;
 	struct resource *dbi_base;
+	int ret;
 
 	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
 	if (!pcie)
@@ -144,6 +235,7 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
 	pci->ops = pcie->drvdata->dw_pcie_ops;
 
 	ls_epc->bar_fixed_64bit = (1 << BAR_2) | (1 << BAR_4);
+	ls_epc->linkup_notifier = true;
 
 	pcie->pci = pci;
 	pcie->ls_epc = ls_epc;
@@ -155,9 +247,15 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
 
 	pci->ep.ops = &ls_pcie_ep_ops;
 
+	pcie->big_endian = of_property_read_bool(dev->of_node, "big-endian");
+
 	platform_set_drvdata(pdev, pcie);
 
-	return dw_pcie_ep_init(&pci->ep);
+	ret = dw_pcie_ep_init(&pci->ep);
+	if (ret)
+		return ret;
+
+	return ls_pcie_ep_interrupt_init(pcie, pdev);
 }
 
 static struct platform_driver ls_pcie_ep_driver = {

drivers/pci/controller/dwc/pcie-qcom-ep.c

@@ -569,9 +569,11 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
 	if (FIELD_GET(PARF_INT_ALL_LINK_DOWN, status)) {
 		dev_dbg(dev, "Received Linkdown event\n");
 		pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN;
+		pci_epc_linkdown(pci->ep.epc);
 	} else if (FIELD_GET(PARF_INT_ALL_BME, status)) {
 		dev_dbg(dev, "Received BME event. Link is enabled!\n");
 		pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED;
+		pci_epc_bme_notify(pci->ep.epc);
 	} else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) {
 		dev_dbg(dev, "Received PM Turn-off event! Entering L23\n");
 		val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);

drivers/pci/endpoint/functions/Kconfig

@@ -27,7 +27,7 @@ config PCI_EPF_NTB
 	  If in doubt, say "N" to disable Endpoint NTB driver.
 
 config PCI_EPF_VNTB
-	tristate "PCI Endpoint NTB driver"
+	tristate "PCI Endpoint Virtual NTB driver"
 	depends on PCI_ENDPOINT
 	depends on NTB
 	select CONFIGFS_FS
@@ -37,3 +37,13 @@ config PCI_EPF_VNTB
 	  between PCI Root Port and PCIe Endpoint.
 
 	  If in doubt, say "N" to disable Endpoint NTB driver.
+
+config PCI_EPF_MHI
+	tristate "PCI Endpoint driver for MHI bus"
+	depends on PCI_ENDPOINT && MHI_BUS_EP
+	help
+	   Enable this configuration option to enable the PCI Endpoint
+	   driver for Modem Host Interface (MHI) bus in Qualcomm Endpoint
+	   devices such as SDX55.
+
+	   If in doubt, say "N" to disable Endpoint driver for MHI bus.

drivers/pci/endpoint/functions/Makefile

@@ -6,3 +6,4 @@
 obj-$(CONFIG_PCI_EPF_TEST)		+= pci-epf-test.o
 obj-$(CONFIG_PCI_EPF_NTB)		+= pci-epf-ntb.o
 obj-$(CONFIG_PCI_EPF_VNTB) 		+= pci-epf-vntb.o
+obj-$(CONFIG_PCI_EPF_MHI)		+= pci-epf-mhi.o