[PATCH v10 00/12] Add MSI-X support on pcitest tool

[PATCH v10 00/12] Add MSI-X support on pcitest tool

[Gustavo Pimentel]

Patch series made against Lorenzo's master branch.

Fix EP link notification implementation.

Add MSI-X support on pcitest tool.

Add new callbacks methods and handlers to trigger the MSI-X interrupts
on the EP DesignWare IP driver.

Allow to set/get MSI-X EP maximum capability number.

Rework on set/get and triggering MSI methods on EP DesignWare IP driver.

Add a new input parameter (msix) to pcitest tool to test MSI-X feature.

Update the pcitest.sh script to support MSI-X feature tests.

Gustavo Pimentel (12):
  PCI: dwc: Fix EP link notification implementation
  PCI: endpoint: Add MSI-X interfaces
  PCI: Update xxx_pcie_ep_raise_irq() and pci_epc_raise_irq() signatures
  PCI: dwc: Add MSI-X callbacks handler
  PCI: dwc: Rework MSI callbacks handler
  PCI: dwc: Add legacy interrupt callback handler
  pci-epf-test/pci_endpoint_test: Cleanup PCI_ENDPOINT_TEST memspace
  pci-epf-test/pci_endpoint_test: Use irq_type module parameter
  pci-epf-test/pci_endpoint_test: Add MSI-X support
  pci_endpoint_test: Add 2 ioctl commands
  tools: PCI: Add MSI-X support
  PCI: endpoint: Add MSI set maximum restriction

 .../PCI/endpoint/function/binding/pci-test.txt     |   2 +
 Documentation/PCI/endpoint/pci-endpoint.txt        |   4 +-
 Documentation/PCI/endpoint/pci-test-function.txt   |  29 ++-
 Documentation/PCI/endpoint/pci-test-howto.txt      |  30 ++-
 Documentation/ioctl/ioctl-number.txt               |   1 +
 Documentation/misc-devices/pci-endpoint-test.txt   |   6 +
 drivers/misc/pci_endpoint_test.c                   | 260 +++++++++++++++------
 drivers/pci/controller/dwc/pci-dra7xx.c            |   2 +-
 drivers/pci/controller/dwc/pcie-artpec6.c          |   2 +-
 drivers/pci/controller/dwc/pcie-designware-ep.c    | 210 +++++++++++++++--
 drivers/pci/controller/dwc/pcie-designware-plat.c  |  11 +-
 drivers/pci/controller/dwc/pcie-designware.h       |  29 ++-
 drivers/pci/controller/pcie-cadence-ep.c           |   3 +-
 drivers/pci/controller/pcie-rockchip-ep.c          |   2 +-
 drivers/pci/endpoint/functions/pci-epf-test.c      |  86 +++++--
 drivers/pci/endpoint/pci-ep-cfs.c                  |  24 ++
 drivers/pci/endpoint/pci-epc-core.c                |  68 +++++-
 include/linux/pci-epc.h                            |  16 +-
 include/linux/pci-epf.h                            |   1 +
 include/uapi/linux/pcitest.h                       |   3 +
 tools/pci/pcitest.c                                |  51 +++-
 tools/pci/pcitest.sh                               |  15 ++
 22 files changed, 706 insertions(+), 149 deletions(-)

-- 
2.7.4

[PATCH v10 01/12] PCI: dwc: Fix EP link notification implementation

[Gustavo Pimentel]

Move specific features settings from EP shared code
(pcie-designware-ep.c) to the driver (pcie-designware-plat.c).

Previous implementation disables the EP link notification
by default for all SoCs that uses EP DesignWare IP, which affects
directly the dra7xx and artpec6 SoCs.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
Change v8->v9:
 - Created patch file.
Change v9->v10:
 - Nothing changed, just to follow the patch set version.

 drivers/pci/controller/dwc/pcie-designware-ep.c   | 14 ++++++--------
 drivers/pci/controller/dwc/pcie-designware-plat.c |  3 +++
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 8650416..04092a7 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -386,15 +386,18 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 		return -ENOMEM;
 	ep->outbound_addr = addr;
 
-	if (ep->ops->ep_init)
-		ep->ops->ep_init(ep);
-
 	epc = devm_pci_epc_create(dev, &epc_ops);
 	if (IS_ERR(epc)) {
 		dev_err(dev, "Failed to create epc device\n");
 		return PTR_ERR(epc);
 	}
 
+	ep->epc = epc;
+	epc_set_drvdata(epc, ep);
+
+	if (ep->ops->ep_init)
+		ep->ops->ep_init(ep);
+
 	ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
 	if (ret < 0)
 		epc->max_functions = 1;
@@ -413,11 +416,6 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 		return -ENOMEM;
 	}
 
-	epc->features = EPC_FEATURE_NO_LINKUP_NOTIFIER;
-	EPC_FEATURE_SET_BAR(epc->features, BAR_0);
-
-	ep->epc = epc;
-	epc_set_drvdata(epc, ep);
 	dw_pcie_setup(pci);
 
 	return 0;
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 5937fed..0ce3440 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -70,10 +70,13 @@ static const struct dw_pcie_ops dw_pcie_ops = {
 static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct pci_epc *epc = ep->epc;
 	enum pci_barno bar;
 
 	for (bar = BAR_0; bar <= BAR_5; bar++)
 		dw_pcie_ep_reset_bar(pci, bar);
+
+	epc->features |= EPC_FEATURE_NO_LINKUP_NOTIFIER;
 }
 
 static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
-- 
2.7.4

[PATCH v10 02/12] PCI: endpoint: Add MSI-X interfaces

[Gustavo Pimentel]

Add PCI_EPC_IRQ_MSIX type.

Add MSI-X callbacks signatures to the ops structure.

Add sysfs interface for set/get MSI-X capability maximum number.

Update documentation accordingly.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v1->v2:
 - Nothing changed, just to follow the patch set version.
Change v2->v3:
 - Moved pci_epc_raise_irq() signature changes to patch file #3.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
Change v4->v5:
 - Nothing changed, just to follow the patch set version.
Change v5->v6:
 - Nothing changed, just to follow the patch set version.
Change v6->v7:
 - Nothing changed, just to follow the patch set version.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Nothing changed, just to follow the patch set version.
Change v9->v10:
 - Updated documentation.

 .../PCI/endpoint/function/binding/pci-test.txt     |  2 +
 drivers/pci/endpoint/pci-ep-cfs.c                  | 24 +++++++++
 drivers/pci/endpoint/pci-epc-core.c                | 57 ++++++++++++++++++++++
 include/linux/pci-epc.h                            |  9 ++++
 include/linux/pci-epf.h                            |  1 +
 5 files changed, 93 insertions(+)

diff --git a/Documentation/PCI/endpoint/function/binding/pci-test.txt b/Documentation/PCI/endpoint/function/binding/pci-test.txt
index 3b68b95..cd76ba4 100644
--- a/Documentation/PCI/endpoint/function/binding/pci-test.txt
+++ b/Documentation/PCI/endpoint/function/binding/pci-test.txt
@@ -15,3 +15,5 @@ subsys_id	 : don't care
 interrupt_pin	 : Should be 1 - INTA, 2 - INTB, 3 - INTC, 4 -INTD
 msi_interrupts	 : Should be 1 to 32 depending on the number of MSI interrupts
 		   to test
+msix_interrupts	 : Should be 1 to 2048 depending on the number of MSI-X
+		   interrupts to test
diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
index 018ea34..d1288a0 100644
--- a/drivers/pci/endpoint/pci-ep-cfs.c
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -286,6 +286,28 @@ static ssize_t pci_epf_msi_interrupts_show(struct config_item *item,
 		       to_pci_epf_group(item)->epf->msi_interrupts);
 }
 
+static ssize_t pci_epf_msix_interrupts_store(struct config_item *item,
+					     const char *page, size_t len)
+{
+	u16 val;
+	int ret;
+
+	ret = kstrtou16(page, 0, &val);
+	if (ret)
+		return ret;
+
+	to_pci_epf_group(item)->epf->msix_interrupts = val;
+
+	return len;
+}
+
+static ssize_t pci_epf_msix_interrupts_show(struct config_item *item,
+					    char *page)
+{
+	return sprintf(page, "%d\n",
+		       to_pci_epf_group(item)->epf->msix_interrupts);
+}
+
 PCI_EPF_HEADER_R(vendorid)
 PCI_EPF_HEADER_W_u16(vendorid)
 
@@ -327,6 +349,7 @@ CONFIGFS_ATTR(pci_epf_, subsys_vendor_id);
 CONFIGFS_ATTR(pci_epf_, subsys_id);
 CONFIGFS_ATTR(pci_epf_, interrupt_pin);
 CONFIGFS_ATTR(pci_epf_, msi_interrupts);
+CONFIGFS_ATTR(pci_epf_, msix_interrupts);
 
 static struct configfs_attribute *pci_epf_attrs[] = {
 	&pci_epf_attr_vendorid,
@@ -340,6 +363,7 @@ static struct configfs_attribute *pci_epf_attrs[] = {
 	&pci_epf_attr_subsys_id,
 	&pci_epf_attr_interrupt_pin,
 	&pci_epf_attr_msi_interrupts,
+	&pci_epf_attr_msix_interrupts,
 	NULL,
 };
 
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index b0ee427..7d77bd0 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -218,6 +218,63 @@ int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts)
 EXPORT_SYMBOL_GPL(pci_epc_set_msi);
 
 /**
+ * pci_epc_get_msix() - get the number of MSI-X interrupt numbers allocated
+ * @epc: the EPC device to which MSI-X interrupts was requested
+ * @func_no: the endpoint function number in the EPC device
+ *
+ * Invoke to get the number of MSI-X interrupts allocated by the RC
+ */
+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;
+
+	if (!epc->ops->get_msix)
+		return 0;
+
+	spin_lock_irqsave(&epc->lock, flags);
+	interrupt = epc->ops->get_msix(epc, func_no);
+	spin_unlock_irqrestore(&epc->lock, flags);
+
+	if (interrupt < 0)
+		return 0;
+
+	return interrupt + 1;
+}
+EXPORT_SYMBOL_GPL(pci_epc_get_msix);
+
+/**
+ * pci_epc_set_msix() - set the number of MSI-X interrupt numbers required
+ * @epc: the EPC device on which MSI-X has to be configured
+ * @func_no: the endpoint function number in the EPC device
+ * @interrupts: number of MSI-X interrupts required by the EPF
+ *
+ * Invoke to set the required number of MSI-X interrupts.
+ */
+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)
+		return -EINVAL;
+
+	if (!epc->ops->set_msix)
+		return 0;
+
+	spin_lock_irqsave(&epc->lock, flags);
+	ret = epc->ops->set_msix(epc, func_no, interrupts - 1);
+	spin_unlock_irqrestore(&epc->lock, flags);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pci_epc_set_msix);
+
+/**
  * pci_epc_unmap_addr() - unmap CPU address from PCI address
  * @epc: the EPC device on which address is allocated
  * @func_no: the endpoint function number in the EPC device
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 243eaa5..89f079f 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -17,6 +17,7 @@ enum pci_epc_irq_type {
 	PCI_EPC_IRQ_UNKNOWN,
 	PCI_EPC_IRQ_LEGACY,
 	PCI_EPC_IRQ_MSI,
+	PCI_EPC_IRQ_MSIX,
 };
 
 /**
@@ -30,6 +31,10 @@ enum pci_epc_irq_type {
  *	     capability register
  * @get_msi: ops to get the number of MSI interrupts allocated by the RC from
  *	     the MSI capability register
+ * @set_msix: ops to set the requested number of MSI-X interrupts in the
+ *	     MSI-X capability register
+ * @get_msix: ops to get the number of MSI-X interrupts allocated by the RC
+ *	     from the MSI-X capability register
  * @raise_irq: ops to raise a legacy or MSI interrupt
  * @start: ops to start the PCI link
  * @stop: ops to stop the PCI link
@@ -48,6 +53,8 @@ struct pci_epc_ops {
 			      phys_addr_t addr);
 	int	(*set_msi)(struct pci_epc *epc, u8 func_no, u8 interrupts);
 	int	(*get_msi)(struct pci_epc *epc, u8 func_no);
+	int	(*set_msix)(struct pci_epc *epc, u8 func_no, u16 interrupts);
+	int	(*get_msix)(struct pci_epc *epc, u8 func_no);
 	int	(*raise_irq)(struct pci_epc *epc, u8 func_no,
 			     enum pci_epc_irq_type type, u8 interrupt_num);
 	int	(*start)(struct pci_epc *epc);
@@ -144,6 +151,8 @@ void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
 			phys_addr_t phys_addr);
 int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts);
 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no);
+int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts);
+int pci_epc_get_msix(struct pci_epc *epc, u8 func_no);
 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
 		      enum pci_epc_irq_type type, u8 interrupt_num);
 int pci_epc_start(struct pci_epc *epc);
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 4e77649..ec02f587 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -119,6 +119,7 @@ struct pci_epf {
 	struct pci_epf_header	*header;
 	struct pci_epf_bar	bar[6];
 	u8			msi_interrupts;
+	u16			msix_interrupts;
 	u8			func_no;
 
 	struct pci_epc		*epc;
-- 
2.7.4

[PATCH v10 03/12] PCI: Update xxx_pcie_ep_raise_irq() and pci_epc_raise_irq() signatures

[Gustavo Pimentel]

Change {cdns, dra7xx, artpec6, dw, rockchip}_pcie_ep_raise_irq() and
pci_epc_raise_irq() signature, namely the interrupt_num variable type
from u8 to u16 to accommodate 2048 maximum MSI-X interrupts.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Alan Douglas <adouglas@cadence.com>
Acked-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v1->v2:
 - Nothing changed, just to follow the patch set version.
Change v2->v3:
 - Move into here the pci_epc_raise_irq() signature change from patch
file #1.
 - Move into here the {dra7xx, artpec6}_pcie_ep_raise_irq() signature
changes from patch file #2.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
Change v4->v5:
 - Swap patch files position (#3 -> #2).
 - Moved dw_pcie_ep_raise_irq and dw_plat_pcie_ep_raise_irq functions
signatures changes from patch file #3.
 - Changed rockchip_pcie_ep_raise_irq function signature.
Change v5->v6:
 - Nothing changed, just to follow the patch set version.
Change v6->v7:
 - Nothing changed, just to follow the patch set version.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Nothing changed, just to follow the patch set version.
Change v9->v10:
 - Nothing changed, just to follow the patch set version.

 drivers/pci/controller/dwc/pci-dra7xx.c           | 2 +-
 drivers/pci/controller/dwc/pcie-artpec6.c         | 2 +-
 drivers/pci/controller/dwc/pcie-designware-ep.c   | 2 +-
 drivers/pci/controller/dwc/pcie-designware-plat.c | 2 +-
 drivers/pci/controller/dwc/pcie-designware.h      | 2 +-
 drivers/pci/controller/pcie-cadence-ep.c          | 3 ++-
 drivers/pci/controller/pcie-rockchip-ep.c         | 2 +-
 drivers/pci/endpoint/pci-epc-core.c               | 8 ++++----
 include/linux/pci-epc.h                           | 6 +++---
 9 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 345aab5..ce9224a 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -370,7 +370,7 @@ static void dra7xx_pcie_raise_msi_irq(struct dra7xx_pcie *dra7xx,
 }
 
 static int dra7xx_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
-				 enum pci_epc_irq_type type, u8 interrupt_num)
+				 enum pci_epc_irq_type type, u16 interrupt_num)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c
index 321b56c..9a2474b 100644
--- a/drivers/pci/controller/dwc/pcie-artpec6.c
+++ b/drivers/pci/controller/dwc/pcie-artpec6.c
@@ -428,7 +428,7 @@ static void artpec6_pcie_ep_init(struct dw_pcie_ep *ep)
 }
 
 static int artpec6_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
-				  enum pci_epc_irq_type type, u8 interrupt_num)
+				  enum pci_epc_irq_type type, u16 interrupt_num)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 04092a7..69d039d 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -242,7 +242,7 @@ static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 func_no, u8 encode_int)
 }
 
 static int dw_pcie_ep_raise_irq(struct pci_epc *epc, u8 func_no,
-				enum pci_epc_irq_type type, u8 interrupt_num)
+				enum pci_epc_irq_type type, u16 interrupt_num)
 {
 	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
 
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 0ce3440..0efb318 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -81,7 +81,7 @@ static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep)
 
 static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 				     enum pci_epc_irq_type type,
-				     u8 interrupt_num)
+				     u16 interrupt_num)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index bee4e25..9d581c0 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -191,7 +191,7 @@ enum dw_pcie_as_type {
 struct dw_pcie_ep_ops {
 	void	(*ep_init)(struct dw_pcie_ep *ep);
 	int	(*raise_irq)(struct dw_pcie_ep *ep, u8 func_no,
-			     enum pci_epc_irq_type type, u8 interrupt_num);
+			     enum pci_epc_irq_type type, u16 interrupt_num);
 };
 
 struct dw_pcie_ep {
diff --git a/drivers/pci/controller/pcie-cadence-ep.c b/drivers/pci/controller/pcie-cadence-ep.c
index e3fe412..208d11f 100644
--- a/drivers/pci/controller/pcie-cadence-ep.c
+++ b/drivers/pci/controller/pcie-cadence-ep.c
@@ -363,7 +363,8 @@ static int cdns_pcie_ep_send_msi_irq(struct cdns_pcie_ep *ep, u8 fn,
 }
 
 static int cdns_pcie_ep_raise_irq(struct pci_epc *epc, u8 fn,
-				  enum pci_epc_irq_type type, u8 interrupt_num)
+				  enum pci_epc_irq_type type,
+				  u16 interrupt_num)
 {
 	struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
 
diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
index 6beba8e..b8163c5 100644
--- a/drivers/pci/controller/pcie-rockchip-ep.c
+++ b/drivers/pci/controller/pcie-rockchip-ep.c
@@ -472,7 +472,7 @@ static int rockchip_pcie_ep_send_msi_irq(struct rockchip_pcie_ep *ep, u8 fn,
 
 static int rockchip_pcie_ep_raise_irq(struct pci_epc *epc, u8 fn,
 				      enum pci_epc_irq_type type,
-				      u8 interrupt_num)
+				      u16 interrupt_num)
 {
 	struct rockchip_pcie_ep *ep = epc_get_drvdata(epc);
 
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 7d77bd0..c72e656 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -131,13 +131,13 @@ EXPORT_SYMBOL_GPL(pci_epc_start);
  * pci_epc_raise_irq() - interrupt the host system
  * @epc: the EPC device which has to interrupt the host
  * @func_no: the endpoint function number in the EPC device
- * @type: specify the type of interrupt; legacy or MSI
- * @interrupt_num: the MSI interrupt number
+ * @type: specify the type of interrupt; legacy, MSI or MSI-X
+ * @interrupt_num: the MSI or MSI-X interrupt number
  *
- * Invoke to raise an MSI or legacy interrupt
+ * Invoke to raise an legacy, MSI or MSI-X interrupt
  */
 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
-		      enum pci_epc_irq_type type, u8 interrupt_num)
+		      enum pci_epc_irq_type type, u16 interrupt_num)
 {
 	int ret;
 	unsigned long flags;
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 89f079f..bb2395b 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -35,7 +35,7 @@ enum pci_epc_irq_type {
  *	     MSI-X capability register
  * @get_msix: ops to get the number of MSI-X interrupts allocated by the RC
  *	     from the MSI-X capability register
- * @raise_irq: ops to raise a legacy or MSI interrupt
+ * @raise_irq: ops to raise a legacy, MSI or MSI-X interrupt
  * @start: ops to start the PCI link
  * @stop: ops to stop the PCI link
  * @owner: the module owner containing the ops
@@ -56,7 +56,7 @@ struct pci_epc_ops {
 	int	(*set_msix)(struct pci_epc *epc, u8 func_no, u16 interrupts);
 	int	(*get_msix)(struct pci_epc *epc, u8 func_no);
 	int	(*raise_irq)(struct pci_epc *epc, u8 func_no,
-			     enum pci_epc_irq_type type, u8 interrupt_num);
+			     enum pci_epc_irq_type type, u16 interrupt_num);
 	int	(*start)(struct pci_epc *epc);
 	void	(*stop)(struct pci_epc *epc);
 	struct module *owner;
@@ -154,7 +154,7 @@ int pci_epc_get_msi(struct pci_epc *epc, u8 func_no);
 int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts);
 int pci_epc_get_msix(struct pci_epc *epc, u8 func_no);
 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
-		      enum pci_epc_irq_type type, u8 interrupt_num);
+		      enum pci_epc_irq_type type, u16 interrupt_num);
 int pci_epc_start(struct pci_epc *epc);
 void pci_epc_stop(struct pci_epc *epc);
 struct pci_epc *pci_epc_get(const char *epc_name);
-- 
2.7.4

[PATCH v10 04/12] PCI: dwc: Add MSI-X callbacks handler

[Gustavo Pimentel]

Add PCIe config space capability search function.

Add sysfs set/get interface to allow the change of EP MSI-X maximum number.

Add EP MSI-X callback for triggering interruptions.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
Change v1->v2:
 - Nothing changed, just to follow the patch set version.
Change v2->v3:
 - Moved dra7xx_pcie_raise_irq() signature change to patch file #3.
 - Moved artpec6_pcie_raise_irq() signature change to patch file #3.
 - Replaced wrong return value 0 to -EINVAL.
 - Removed an else if by code refactoring.
 - Reduced the size of ioremap_nocache mapping from ep->addr_size to
PCI_MSIX_ENTRY_SIZE.
 - Fixed a small bug. If the MSI-X vector bit has been set, the function
would return without executing the proper unmap.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
 - Added static prefix to __dw_pcie_ep_find_next_cap function.
Change v4->v5:
 - Added static prefix to dw_pcie_ep_find_capability function.
 - Swap patch files position (#2 <-> #3).
 - Moved dw_pcie_ep_raise_irq and dw_plat_pcie_ep_raise_irq functions
signatures change to patch file #2.
Change v5->v6:
 - Nothing changed, just to follow the patch set version.
Change v6->v7:
 - Nothing changed, just to follow the patch set version.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Nothing changed, just to follow the patch set version.
Change v9->v10:
 - Reuse of msix_mem and msi_mem_phys variables.

 drivers/pci/controller/dwc/pcie-designware-ep.c   | 137 +++++++++++++++++++++-
 drivers/pci/controller/dwc/pcie-designware-plat.c |   2 +
 drivers/pci/controller/dwc/pcie-designware.h      |  10 ++
 3 files changed, 148 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 69d039d..23be2c0 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -40,6 +40,39 @@ void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
 	__dw_pcie_ep_reset_bar(pci, bar, 0);
 }
 
+static u8 __dw_pcie_ep_find_next_cap(struct dw_pcie *pci, u8 cap_ptr,
+			      u8 cap)
+{
+	u8 cap_id, next_cap_ptr;
+	u16 reg;
+
+	reg = dw_pcie_readw_dbi(pci, cap_ptr);
+	next_cap_ptr = (reg & 0xff00) >> 8;
+	cap_id = (reg & 0x00ff);
+
+	if (!next_cap_ptr || cap_id > PCI_CAP_ID_MAX)
+		return 0;
+
+	if (cap_id == cap)
+		return cap_ptr;
+
+	return __dw_pcie_ep_find_next_cap(pci, next_cap_ptr, cap);
+}
+
+static u8 dw_pcie_ep_find_capability(struct dw_pcie *pci, u8 cap)
+{
+	u8 next_cap_ptr;
+	u16 reg;
+
+	reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST);
+	next_cap_ptr = (reg & 0x00ff);
+
+	if (!next_cap_ptr)
+		return 0;
+
+	return __dw_pcie_ep_find_next_cap(pci, next_cap_ptr, cap);
+}
+
 static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no,
 				   struct pci_epf_header *hdr)
 {
@@ -241,6 +274,45 @@ static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 func_no, u8 encode_int)
 	return 0;
 }
 
+static int dw_pcie_ep_get_msix(struct pci_epc *epc, u8 func_no)
+{
+	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	u32 val, reg;
+
+	if (!ep->msix_cap)
+		return -EINVAL;
+
+	reg = ep->msix_cap + PCI_MSIX_FLAGS;
+	val = dw_pcie_readw_dbi(pci, reg);
+	if (!(val & PCI_MSIX_FLAGS_ENABLE))
+		return -EINVAL;
+
+	val &= PCI_MSIX_FLAGS_QSIZE;
+
+	return val;
+}
+
+static int dw_pcie_ep_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts)
+{
+	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	u32 val, reg;
+
+	if (!ep->msix_cap)
+		return -EINVAL;
+
+	reg = ep->msix_cap + PCI_MSIX_FLAGS;
+	val = dw_pcie_readw_dbi(pci, reg);
+	val &= ~PCI_MSIX_FLAGS_QSIZE;
+	val |= interrupts;
+	dw_pcie_dbi_ro_wr_en(pci);
+	dw_pcie_writew_dbi(pci, reg, val);
+	dw_pcie_dbi_ro_wr_dis(pci);
+
+	return 0;
+}
+
 static int dw_pcie_ep_raise_irq(struct pci_epc *epc, u8 func_no,
 				enum pci_epc_irq_type type, u16 interrupt_num)
 {
@@ -282,6 +354,8 @@ static const struct pci_epc_ops epc_ops = {
 	.unmap_addr		= dw_pcie_ep_unmap_addr,
 	.set_msi		= dw_pcie_ep_set_msi,
 	.get_msi		= dw_pcie_ep_get_msi,
+	.set_msix		= dw_pcie_ep_set_msix,
+	.get_msix		= dw_pcie_ep_get_msix,
 	.raise_irq		= dw_pcie_ep_raise_irq,
 	.start			= dw_pcie_ep_start,
 	.stop			= dw_pcie_ep_stop,
@@ -322,6 +396,64 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
+int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
+			     u16 interrupt_num)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct pci_epc *epc = ep->epc;
+	u16 tbl_offset, bir;
+	u32 bar_addr_upper, bar_addr_lower;
+	u32 msg_addr_upper, msg_addr_lower;
+	u32 reg, msg_data, vec_ctrl;
+	u64 tbl_addr, msg_addr, reg_u64;
+	void __iomem *msix_tbl;
+	int ret;
+
+	reg = ep->msix_cap + PCI_MSIX_TABLE;
+	tbl_offset = dw_pcie_readl_dbi(pci, reg);
+	bir = (tbl_offset & PCI_MSIX_TABLE_BIR);
+	tbl_offset &= PCI_MSIX_TABLE_OFFSET;
+	tbl_offset >>= 3;
+
+	reg = PCI_BASE_ADDRESS_0 + (4 * bir);
+	bar_addr_upper = 0;
+	bar_addr_lower = dw_pcie_readl_dbi(pci, reg);
+	reg_u64 = (bar_addr_lower & PCI_BASE_ADDRESS_MEM_TYPE_MASK);
+	if (reg_u64 == PCI_BASE_ADDRESS_MEM_TYPE_64)
+		bar_addr_upper = dw_pcie_readl_dbi(pci, reg + 4);
+
+	tbl_addr = ((u64) bar_addr_upper) << 32 | bar_addr_lower;
+	tbl_addr += (tbl_offset + ((interrupt_num - 1) * PCI_MSIX_ENTRY_SIZE));
+	tbl_addr &= PCI_BASE_ADDRESS_MEM_MASK;
+
+	msix_tbl = ioremap_nocache(ep->phys_base + tbl_addr,
+				   PCI_MSIX_ENTRY_SIZE);
+	if (!msix_tbl)
+		return -EINVAL;
+
+	msg_addr_lower = readl(msix_tbl + PCI_MSIX_ENTRY_LOWER_ADDR);
+	msg_addr_upper = readl(msix_tbl + PCI_MSIX_ENTRY_UPPER_ADDR);
+	msg_addr = ((u64) msg_addr_upper) << 32 | msg_addr_lower;
+	msg_data = readl(msix_tbl + PCI_MSIX_ENTRY_DATA);
+	vec_ctrl = readl(msix_tbl + PCI_MSIX_ENTRY_VECTOR_CTRL);
+
+	iounmap(msix_tbl);
+
+	if (vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT)
+		return -EPERM;
+
+	ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr,
+				  epc->mem->page_size);
+	if (ret)
+		return ret;
+
+	writel(msg_data, ep->msi_mem);
+
+	dw_pcie_ep_unmap_addr(epc, func_no, ep->msi_mem_phys);
+
+	return 0;
+}
+
 void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
 {
 	struct pci_epc *epc = ep->epc;
@@ -412,9 +544,12 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 	ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys,
 					     epc->mem->page_size);
 	if (!ep->msi_mem) {
-		dev_err(dev, "Failed to reserve memory for MSI\n");
+		dev_err(dev, "Failed to reserve memory for MSI/MSI-X\n");
 		return -ENOMEM;
 	}
+	ep->msi_cap = dw_pcie_ep_find_capability(pci, PCI_CAP_ID_MSI);
+
+	ep->msix_cap = dw_pcie_ep_find_capability(pci, PCI_CAP_ID_MSIX);
 
 	dw_pcie_setup(pci);
 
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 0efb318..8bb2ecb 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -91,6 +91,8 @@ static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 		return -EINVAL;
 	case PCI_EPC_IRQ_MSI:
 		return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
+	case PCI_EPC_IRQ_MSIX:
+		return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
 	default:
 		dev_err(pci->dev, "UNKNOWN IRQ type\n");
 	}
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 9d581c0..00ac419 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -208,6 +208,8 @@ struct dw_pcie_ep {
 	u32			num_ob_windows;
 	void __iomem		*msi_mem;
 	phys_addr_t		msi_mem_phys;
+	u8			msi_cap;	/* MSI capability offset */
+	u8			msix_cap;	/* MSI-X capability offset */
 };
 
 struct dw_pcie_ops {
@@ -359,6 +361,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep);
 void dw_pcie_ep_exit(struct dw_pcie_ep *ep);
 int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 			     u8 interrupt_num);
+int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
+			     u16 interrupt_num);
 void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar);
 #else
 static inline void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
@@ -380,6 +384,12 @@ static inline int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
+static inline int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
+					   u16 interrupt_num)
+{
+	return 0;
+}
+
 static inline void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
 {
 }
-- 
2.7.4

[PATCH v10 05/12] PCI: dwc: Rework MSI callbacks handler

[Gustavo Pimentel]

Remove duplicate defines located on pcie-designware.h file already
available on /include/uapi/linux/pci-regs.h file.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v1->v2:
 - Nothing changed, just to follow the patch set version.
Change v2->v3:
 - Replaced wrong return value 0 to -EINVAL.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
Change v4->v5:
 - Moved pci_epc_set_msi maximum interrupts validation into a new patch
file #11.
Change v5->v6:
 - Nothing changed, just to follow the patch set version.
Change v6->v7:
 - Nothing changed, just to follow the patch set version.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Nothing changed, just to follow the patch set version.
Change v9->v10:
 - Nothing changed, just to follow the patch set version.

 drivers/pci/controller/dwc/pcie-designware-ep.c | 49 +++++++++++++++++--------
 drivers/pci/controller/dwc/pcie-designware.h    | 11 ------
 2 files changed, 33 insertions(+), 27 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 23be2c0..dd9c366 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -246,29 +246,38 @@ static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no,
 
 static int dw_pcie_ep_get_msi(struct pci_epc *epc, u8 func_no)
 {
-	int val;
 	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	u32 val, reg;
+
+	if (!ep->msi_cap)
+		return -EINVAL;
 
-	val = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL);
-	if (!(val & MSI_CAP_MSI_EN_MASK))
+	reg = ep->msi_cap + PCI_MSI_FLAGS;
+	val = dw_pcie_readw_dbi(pci, reg);
+	if (!(val & PCI_MSI_FLAGS_ENABLE))
 		return -EINVAL;
 
-	val = (val & MSI_CAP_MME_MASK) >> MSI_CAP_MME_SHIFT;
+	val = (val & PCI_MSI_FLAGS_QSIZE) >> 4;
+
 	return val;
 }
 
-static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 func_no, u8 encode_int)
+static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts)
 {
-	int val;
 	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	u32 val, reg;
 
-	val = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL);
-	val &= ~MSI_CAP_MMC_MASK;
-	val |= (encode_int << MSI_CAP_MMC_SHIFT) & MSI_CAP_MMC_MASK;
+	if (!ep->msi_cap)
+		return -EINVAL;
+
+	reg = ep->msi_cap + PCI_MSI_FLAGS;
+	val = dw_pcie_readw_dbi(pci, reg);
+	val &= ~PCI_MSI_FLAGS_QMASK;
+	val |= (interrupts << 1) & PCI_MSI_FLAGS_QMASK;
 	dw_pcie_dbi_ro_wr_en(pci);
-	dw_pcie_writew_dbi(pci, MSI_MESSAGE_CONTROL, val);
+	dw_pcie_writew_dbi(pci, reg, val);
 	dw_pcie_dbi_ro_wr_dis(pci);
 
 	return 0;
@@ -367,21 +376,29 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 	struct pci_epc *epc = ep->epc;
 	u16 msg_ctrl, msg_data;
-	u32 msg_addr_lower, msg_addr_upper;
+	u32 msg_addr_lower, msg_addr_upper, reg;
 	u64 msg_addr;
 	bool has_upper;
 	int ret;
 
+	if (!ep->msi_cap)
+		return -EINVAL;
+
 	/* Raise MSI per the PCI Local Bus Specification Revision 3.0, 6.8.1. */
-	msg_ctrl = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL);
+	reg = ep->msi_cap + PCI_MSI_FLAGS;
+	msg_ctrl = dw_pcie_readw_dbi(pci, reg);
 	has_upper = !!(msg_ctrl & PCI_MSI_FLAGS_64BIT);
-	msg_addr_lower = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_L32);
+	reg = ep->msi_cap + PCI_MSI_ADDRESS_LO;
+	msg_addr_lower = dw_pcie_readl_dbi(pci, reg);
 	if (has_upper) {
-		msg_addr_upper = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_U32);
-		msg_data = dw_pcie_readw_dbi(pci, MSI_MESSAGE_DATA_64);
+		reg = ep->msi_cap + PCI_MSI_ADDRESS_HI;
+		msg_addr_upper = dw_pcie_readl_dbi(pci, reg);
+		reg = ep->msi_cap + PCI_MSI_DATA_64;
+		msg_data = dw_pcie_readw_dbi(pci, reg);
 	} else {
 		msg_addr_upper = 0;
-		msg_data = dw_pcie_readw_dbi(pci, MSI_MESSAGE_DATA_32);
+		reg = ep->msi_cap + PCI_MSI_DATA_32;
+		msg_data = dw_pcie_readw_dbi(pci, reg);
 	}
 	msg_addr = ((u64) msg_addr_upper) << 32 | msg_addr_lower;
 	ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr,
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 00ac419..e8b97f5 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -96,17 +96,6 @@
 #define PCIE_GET_ATU_INB_UNR_REG_OFFSET(region)				\
 			((0x3 << 20) | ((region) << 9) | (0x1 << 8))
 
-#define MSI_MESSAGE_CONTROL		0x52
-#define MSI_CAP_MMC_SHIFT		1
-#define MSI_CAP_MMC_MASK		(7 << MSI_CAP_MMC_SHIFT)
-#define MSI_CAP_MME_SHIFT		4
-#define MSI_CAP_MSI_EN_MASK		0x1
-#define MSI_CAP_MME_MASK		(7 << MSI_CAP_MME_SHIFT)
-#define MSI_MESSAGE_ADDR_L32		0x54
-#define MSI_MESSAGE_ADDR_U32		0x58
-#define MSI_MESSAGE_DATA_32		0x58
-#define MSI_MESSAGE_DATA_64		0x5C
-
 #define MAX_MSI_IRQS			256
 #define MAX_MSI_IRQS_PER_CTRL		32
 #define MAX_MSI_CTRLS			(MAX_MSI_IRQS / MAX_MSI_IRQS_PER_CTRL)
-- 
2.7.4

[PATCH v10 06/12] PCI: dwc: Add legacy interrupt callback handler

[Gustavo Pimentel]

Add a legacy interrupt callback handler. Currently DesignWare IP don't
allow trigger legacy interrupts.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v1->v2:
 - Nothing changed, just to follow the patch set version.
Change v2->v3:
 - Nothing changed, just to follow the patch set version.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
Change v4->v5:
 - Nothing changed, just to follow the patch set version.
Change v5->v6:
 - Nothing changed, just to follow the patch set version.
Change v6->v7:
 - Nothing changed, just to follow the patch set version.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Nothing changed, just to follow the patch set version.
Change v9->v10:
 - Nothing changed, just to follow the patch set version.

 drivers/pci/controller/dwc/pcie-designware-ep.c   | 10 ++++++++++
 drivers/pci/controller/dwc/pcie-designware-plat.c |  3 +--
 drivers/pci/controller/dwc/pcie-designware.h      |  6 ++++++
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index dd9c366..1e7b022 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -370,6 +370,16 @@ static const struct pci_epc_ops epc_ops = {
 	.stop			= dw_pcie_ep_stop,
 };
 
+int dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 func_no)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct device *dev = pci->dev;
+
+	dev_err(dev, "EP cannot trigger legacy IRQs\n");
+
+	return -EINVAL;
+}
+
 int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 			     u8 interrupt_num)
 {
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 8bb2ecb..160714d 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -87,8 +87,7 @@ static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 
 	switch (type) {
 	case PCI_EPC_IRQ_LEGACY:
-		dev_err(pci->dev, "EP cannot trigger legacy IRQs\n");
-		return -EINVAL;
+		return dw_pcie_ep_raise_legacy_irq(ep, func_no);
 	case PCI_EPC_IRQ_MSI:
 		return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
 	case PCI_EPC_IRQ_MSIX:
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index e8b97f5..96126fd 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -348,6 +348,7 @@ static inline int dw_pcie_allocate_domains(struct pcie_port *pp)
 void dw_pcie_ep_linkup(struct dw_pcie_ep *ep);
 int dw_pcie_ep_init(struct dw_pcie_ep *ep);
 void dw_pcie_ep_exit(struct dw_pcie_ep *ep);
+int dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 func_no);
 int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 			     u8 interrupt_num);
 int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
@@ -367,6 +368,11 @@ static inline void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
 {
 }
 
+static inline int dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 func_no)
+{
+	return 0;
+}
+
 static inline int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 					   u8 interrupt_num)
 {
-- 
2.7.4

[PATCH v10 07/12] pci-epf-test/pci_endpoint_test: Cleanup PCI_ENDPOINT_TEST memspace

[Gustavo Pimentel]

Cleanup PCI_ENDPOINT_TEST memspace (by moving the interrupt number away
from command section).

Add IRQ_TYPE register to identify the triggered ID interrupt required
for the READ/WRITE/COPY tests and raise IRQ test commands.

Update documentation accordingly.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
Change v2->v3:
 - New patch file created base on the previous patch
"misc: pci_endpoint_test: Add MSI-X support" patch file following
Kishon's suggestion.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
Change v4->v5:
 - Reverted irq_num rename to msi_num.
 - Added comment about the MSI-X bit reservation for future implementation.
Change v5->v6:
 - Nothing changed, just to follow the patch set version.
Change v6->v7:
 - Updated documentation.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Nothing changed, just to follow the patch set version.
Change v9->v10:
 - Update documentation and patch description.

 Documentation/PCI/endpoint/pci-test-function.txt |  8 +--
 Documentation/PCI/endpoint/pci-test-function.txt | 27 ++++++--
 drivers/misc/pci_endpoint_test.c                 | 81 +++++++++++++++---------
 drivers/pci/endpoint/functions/pci-epf-test.c    | 61 ++++++++++++------
 3 files changed, 114 insertions(+), 55 deletions(-)

diff --git a/Documentation/PCI/endpoint/pci-test-function.txt b/Documentation/PCI/endpoint/pci-test-function.txt
index 0c519c9..bf4b5cf 100644
--- a/Documentation/PCI/endpoint/pci-test-function.txt
+++ b/Documentation/PCI/endpoint/pci-test-function.txt
@@ -20,6 +20,8 @@ The PCI endpoint test device has the following registers:
 	5) PCI_ENDPOINT_TEST_DST_ADDR
 	6) PCI_ENDPOINT_TEST_SIZE
 	7) PCI_ENDPOINT_TEST_CHECKSUM
+	8) PCI_ENDPOINT_TEST_IRQ_TYPE
+	9) PCI_ENDPOINT_TEST_IRQ_NUMBER
 
 *) PCI_ENDPOINT_TEST_MAGIC
 
@@ -34,10 +36,10 @@ that the endpoint device must perform.
 Bitfield Description:
   Bit 0		: raise legacy IRQ
   Bit 1		: raise MSI IRQ
-  Bit 2 - 7	: MSI interrupt number
-  Bit 8		: read command (read data from RC buffer)
-  Bit 9		: write command (write data to RC buffer)
-  Bit 10	: copy command (copy data from one RC buffer to another
+  Bit 2		: raise MSI-X IRQ (reserved for future implementation)
+  Bit 3		: read command (read data from RC buffer)
+  Bit 4		: write command (write data to RC buffer)
+  Bit 5		: copy command (copy data from one RC buffer to another
 		  RC buffer)
 
 *) PCI_ENDPOINT_TEST_STATUS
@@ -64,3 +66,20 @@ COPY/READ command.
 
 This register contains the destination address (RC buffer address) for
 the COPY/WRITE command.
+
+*) PCI_ENDPOINT_TEST_IRQ_TYPE
+
+This register contains the interrupt type (Legacy/MSI) triggered
+for the READ/WRITE/COPY and raise IRQ (Legacy/MSI) commands.
+
+Possible types:
+ - Legacy	: 0
+ - MSI		: 1
+
+*) PCI_ENDPOINT_TEST_IRQ_NUMBER
+
+This register contains the triggered ID interrupt.
+
+Admissible values:
+ - Legacy	: 0
+ - MSI		: [1 .. 32]
diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 7b37046..35fbfbd 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -35,38 +35,43 @@
 
 #include <uapi/linux/pcitest.h>
 
-#define DRV_MODULE_NAME			"pci-endpoint-test"
-
-#define PCI_ENDPOINT_TEST_MAGIC		0x0
-
-#define PCI_ENDPOINT_TEST_COMMAND	0x4
-#define COMMAND_RAISE_LEGACY_IRQ	BIT(0)
-#define COMMAND_RAISE_MSI_IRQ		BIT(1)
-#define MSI_NUMBER_SHIFT		2
-/* 6 bits for MSI number */
-#define COMMAND_READ                    BIT(8)
-#define COMMAND_WRITE                   BIT(9)
-#define COMMAND_COPY                    BIT(10)
-
-#define PCI_ENDPOINT_TEST_STATUS	0x8
-#define STATUS_READ_SUCCESS             BIT(0)
-#define STATUS_READ_FAIL                BIT(1)
-#define STATUS_WRITE_SUCCESS            BIT(2)
-#define STATUS_WRITE_FAIL               BIT(3)
-#define STATUS_COPY_SUCCESS             BIT(4)
-#define STATUS_COPY_FAIL                BIT(5)
-#define STATUS_IRQ_RAISED               BIT(6)
-#define STATUS_SRC_ADDR_INVALID         BIT(7)
-#define STATUS_DST_ADDR_INVALID         BIT(8)
-
-#define PCI_ENDPOINT_TEST_LOWER_SRC_ADDR	0xc
+#define DRV_MODULE_NAME				"pci-endpoint-test"
+
+#define IRQ_TYPE_LEGACY				0
+#define IRQ_TYPE_MSI				1
+
+#define PCI_ENDPOINT_TEST_MAGIC			0x0
+
+#define PCI_ENDPOINT_TEST_COMMAND		0x4
+#define COMMAND_RAISE_LEGACY_IRQ		BIT(0)
+#define COMMAND_RAISE_MSI_IRQ			BIT(1)
+/* BIT(2) is reserved for raising MSI-X IRQ command */
+#define COMMAND_READ				BIT(3)
+#define COMMAND_WRITE				BIT(4)
+#define COMMAND_COPY				BIT(5)
+
+#define PCI_ENDPOINT_TEST_STATUS		0x8
+#define STATUS_READ_SUCCESS			BIT(0)
+#define STATUS_READ_FAIL			BIT(1)
+#define STATUS_WRITE_SUCCESS			BIT(2)
+#define STATUS_WRITE_FAIL			BIT(3)
+#define STATUS_COPY_SUCCESS			BIT(4)
+#define STATUS_COPY_FAIL			BIT(5)
+#define STATUS_IRQ_RAISED			BIT(6)
+#define STATUS_SRC_ADDR_INVALID			BIT(7)
+#define STATUS_DST_ADDR_INVALID			BIT(8)
+
+#define PCI_ENDPOINT_TEST_LOWER_SRC_ADDR	0x0c
 #define PCI_ENDPOINT_TEST_UPPER_SRC_ADDR	0x10
 
 #define PCI_ENDPOINT_TEST_LOWER_DST_ADDR	0x14
 #define PCI_ENDPOINT_TEST_UPPER_DST_ADDR	0x18
 
-#define PCI_ENDPOINT_TEST_SIZE		0x1c
-#define PCI_ENDPOINT_TEST_CHECKSUM	0x20
+#define PCI_ENDPOINT_TEST_SIZE			0x1c
+#define PCI_ENDPOINT_TEST_CHECKSUM		0x20
+
+#define PCI_ENDPOINT_TEST_IRQ_TYPE		0x24
+#define PCI_ENDPOINT_TEST_IRQ_NUMBER		0x28
 
 static DEFINE_IDA(pci_endpoint_test_ida);
 
@@ -179,6 +184,9 @@ static bool pci_endpoint_test_legacy_irq(struct pci_endpoint_test *test)
 {
 	u32 val;
 
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
+				 IRQ_TYPE_LEGACY);
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 0);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
 				 COMMAND_RAISE_LEGACY_IRQ);
 	val = wait_for_completion_timeout(&test->irq_raised,
@@ -195,8 +203,10 @@ static bool pci_endpoint_test_msi_irq(struct pci_endpoint_test *test,
 	u32 val;
 	struct pci_dev *pdev = test->pdev;
 
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
+				 IRQ_TYPE_MSI);
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, msi_num);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
-				 msi_num << MSI_NUMBER_SHIFT |
 				 COMMAND_RAISE_MSI_IRQ);
 	val = wait_for_completion_timeout(&test->irq_raised,
 					  msecs_to_jiffies(1000));
@@ -281,8 +291,11 @@ static bool pci_endpoint_test_copy(struct pci_endpoint_test *test, size_t size)
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE,
 				 size);
 
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
+				 no_msi ? IRQ_TYPE_LEGACY : IRQ_TYPE_MSI);
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
-				 1 << MSI_NUMBER_SHIFT | COMMAND_COPY);
+				 COMMAND_COPY);
 
 	wait_for_completion(&test->irq_raised);
 
@@ -348,8 +361,11 @@ static bool pci_endpoint_test_write(struct pci_endpoint_test *test, size_t size)
 
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE, size);
 
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
+				 no_msi ? IRQ_TYPE_LEGACY : IRQ_TYPE_MSI);
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
-				 1 << MSI_NUMBER_SHIFT | COMMAND_READ);
+				 COMMAND_READ);
 
 	wait_for_completion(&test->irq_raised);
 
@@ -403,8 +419,11 @@ static bool pci_endpoint_test_read(struct pci_endpoint_test *test, size_t size)
 
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE, size);
 
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
+				 no_msi ? IRQ_TYPE_LEGACY : IRQ_TYPE_MSI);
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
-				 1 << MSI_NUMBER_SHIFT | COMMAND_WRITE);
+				 COMMAND_WRITE);
 
 	wait_for_completion(&test->irq_raised);
 
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 63ed706..eb9cd00 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -18,13 +18,15 @@
 #include <linux/pci-epf.h>
 #include <linux/pci_regs.h>
 
+#define IRQ_TYPE_LEGACY			0
+#define IRQ_TYPE_MSI			1
+
 #define COMMAND_RAISE_LEGACY_IRQ	BIT(0)
 #define COMMAND_RAISE_MSI_IRQ		BIT(1)
-#define MSI_NUMBER_SHIFT		2
-#define MSI_NUMBER_MASK			(0x3f << MSI_NUMBER_SHIFT)
-#define COMMAND_READ			BIT(8)
-#define COMMAND_WRITE			BIT(9)
-#define COMMAND_COPY			BIT(10)
+/* BIT(2) is reserved for raising MSI-X IRQ command */
+#define COMMAND_READ			BIT(3)
+#define COMMAND_WRITE			BIT(4)
+#define COMMAND_COPY			BIT(5)
 
 #define STATUS_READ_SUCCESS		BIT(0)
 #define STATUS_READ_FAIL		BIT(1)
@@ -56,6 +58,8 @@ struct pci_epf_test_reg {
 	u64	dst_addr;
 	u32	size;
 	u32	checksum;
+	u32	irq_type;
+	u32	irq_number;
 } __packed;
 
 static struct pci_epf_header test_header = {
@@ -244,31 +248,39 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
 	return ret;
 }
 
-static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test, u8 irq)
+static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test, u8 irq_type,
+				   u16 irq)
 {
-	u8 msi_count;
 	struct pci_epf *epf = epf_test->epf;
+	struct device *dev = &epf->dev;
 	struct pci_epc *epc = epf->epc;
 	enum pci_barno test_reg_bar = epf_test->test_reg_bar;
 	struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
 
 	reg->status |= STATUS_IRQ_RAISED;
-	msi_count = pci_epc_get_msi(epc, epf->func_no);
-	if (irq > msi_count || msi_count <= 0)
+
+	switch (irq_type) {
+	case IRQ_TYPE_LEGACY:
 		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_LEGACY, 0);
-	else
+		break;
+	case IRQ_TYPE_MSI:
 		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, irq);
+		break;
+	default:
+		dev_err(dev, "Failed to raise IRQ, unknown type\n");
+		break;
+	}
 }
 
 static void pci_epf_test_cmd_handler(struct work_struct *work)
 {
 	int ret;
-	u8 irq;
-	u8 msi_count;
+	u16 count;
 	u32 command;
 	struct pci_epf_test *epf_test = container_of(work, struct pci_epf_test,
 						     cmd_handler.work);
 	struct pci_epf *epf = epf_test->epf;
+	struct device *dev = &epf->dev;
 	struct pci_epc *epc = epf->epc;
 	enum pci_barno test_reg_bar = epf_test->test_reg_bar;
 	struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
@@ -280,7 +292,10 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
 	reg->command = 0;
 	reg->status = 0;
 
-	irq = (command & MSI_NUMBER_MASK) >> MSI_NUMBER_SHIFT;
+	if (reg->irq_type > IRQ_TYPE_MSI) {
+		dev_err(dev, "Failed to detect IRQ type\n");
+		goto reset_handler;
+	}
 
 	if (command & COMMAND_RAISE_LEGACY_IRQ) {
 		reg->status = STATUS_IRQ_RAISED;
@@ -294,7 +309,8 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
 			reg->status |= STATUS_WRITE_FAIL;
 		else
 			reg->status |= STATUS_WRITE_SUCCESS;
-		pci_epf_test_raise_irq(epf_test, irq);
+		pci_epf_test_raise_irq(epf_test, reg->irq_type,
+				       reg->irq_number);
 		goto reset_handler;
 	}
 
@@ -304,7 +320,8 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
 			reg->status |= STATUS_READ_SUCCESS;
 		else
 			reg->status |= STATUS_READ_FAIL;
-		pci_epf_test_raise_irq(epf_test, irq);
+		pci_epf_test_raise_irq(epf_test, reg->irq_type,
+				       reg->irq_number);
 		goto reset_handler;
 	}
 
@@ -314,16 +331,18 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
 			reg->status |= STATUS_COPY_SUCCESS;
 		else
 			reg->status |= STATUS_COPY_FAIL;
-		pci_epf_test_raise_irq(epf_test, irq);
+		pci_epf_test_raise_irq(epf_test, reg->irq_type,
+				       reg->irq_number);
 		goto reset_handler;
 	}
 
 	if (command & COMMAND_RAISE_MSI_IRQ) {
-		msi_count = pci_epc_get_msi(epc, epf->func_no);
-		if (irq > msi_count || msi_count <= 0)
+		count = pci_epc_get_msi(epc, epf->func_no);
+		if (reg->irq_number > count || count <= 0)
 			goto reset_handler;
 		reg->status = STATUS_IRQ_RAISED;
-		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, irq);
+		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI,
+				  reg->irq_number);
 		goto reset_handler;
 	}
 
@@ -457,8 +476,10 @@ static int pci_epf_test_bind(struct pci_epf *epf)
 		return ret;
 
 	ret = pci_epc_set_msi(epc, epf->func_no, epf->msi_interrupts);
-	if (ret)
+	if (ret) {
+		dev_err(dev, "MSI configuration failed\n");
 		return ret;
+	}
 
 	if (!epf_test->linkup_notifier)
 		queue_work(kpcitest_workqueue, &epf_test->cmd_handler.work);
-- 
2.7.4

[PATCH v10 08/12] pci-epf-test/pci_endpoint_test: Use irq_type module parameter

[Gustavo Pimentel]

Add new driver parameter to allow interruption type selection.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v2->v3:
 - New patch file created base on the previous patch
"misc: pci_endpoint_test: Add MSI-X support" patch file following
Kishon's suggestion.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
Change v4->v5:
 - Nothing changed, just to follow the patch set version.
Change v5->v6:
 - Nothing changed, just to follow the patch set version.
Change v6->v7:
 - Removed unnecessary set to zero variable.
 - Removed empty line.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Nothing changed, just to follow the patch set version.
Change v9->v10:
 - Nothing changed, just to follow the patch set version.

 drivers/misc/pci_endpoint_test.c | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 35fbfbd..349794c 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -82,6 +82,10 @@ static bool no_msi;
 module_param(no_msi, bool, 0444);
 MODULE_PARM_DESC(no_msi, "Disable MSI interrupt in pci_endpoint_test");
 
+static int irq_type = IRQ_TYPE_MSI;
+module_param(irq_type, int, 0444);
+MODULE_PARM_DESC(irq_type, "IRQ mode selection in pci_endpoint_test (0 - Legacy, 1 - MSI)");
+
 enum pci_barno {
 	BAR_0,
 	BAR_1,
@@ -108,7 +112,7 @@ struct pci_endpoint_test {
 struct pci_endpoint_test_data {
 	enum pci_barno test_reg_bar;
 	size_t alignment;
-	bool no_msi;
+	int irq_type;
 };
 
 static inline u32 pci_endpoint_test_readl(struct pci_endpoint_test *test,
@@ -291,8 +295,7 @@ static bool pci_endpoint_test_copy(struct pci_endpoint_test *test, size_t size)
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE,
 				 size);
 
-	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
-				 no_msi ? IRQ_TYPE_LEGACY : IRQ_TYPE_MSI);
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE, irq_type);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
 				 COMMAND_COPY);
@@ -361,8 +364,7 @@ static bool pci_endpoint_test_write(struct pci_endpoint_test *test, size_t size)
 
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE, size);
 
-	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
-				 no_msi ? IRQ_TYPE_LEGACY : IRQ_TYPE_MSI);
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE, irq_type);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
 				 COMMAND_READ);
@@ -419,8 +421,7 @@ static bool pci_endpoint_test_read(struct pci_endpoint_test *test, size_t size)
 
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE, size);
 
-	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
-				 no_msi ? IRQ_TYPE_LEGACY : IRQ_TYPE_MSI);
+	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE, irq_type);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
 				 COMMAND_WRITE);
@@ -505,11 +506,14 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 	test->alignment = 0;
 	test->pdev = pdev;
 
+	if (no_msi)
+		irq_type = IRQ_TYPE_LEGACY;
+
 	data = (struct pci_endpoint_test_data *)ent->driver_data;
 	if (data) {
 		test_reg_bar = data->test_reg_bar;
 		test->alignment = data->alignment;
-		no_msi = data->no_msi;
+		irq_type = data->irq_type;
 	}
 
 	init_completion(&test->irq_raised);
@@ -529,11 +533,17 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 
 	pci_set_master(pdev);
 
-	if (!no_msi) {
+	switch (irq_type) {
+	case IRQ_TYPE_LEGACY:
+		break;
+	case IRQ_TYPE_MSI:
 		irq = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI);
 		if (irq < 0)
 			dev_err(dev, "Failed to get MSI interrupts\n");
 		test->num_irqs = irq;
+		break;
+	default:
+		dev_err(dev, "Invalid IRQ type selected\n");
 	}
 
 	err = devm_request_irq(dev, pdev->irq, pci_endpoint_test_irqhandler,
-- 
2.7.4

[PATCH v10 09/12] pci-epf-test/pci_endpoint_test: Add MSI-X support

[Gustavo Pimentel]

Add MSI-X support and update driver documentation accordingly.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v2->v3:
 - New patch file created base on the previous patch
"misc: pci_endpoint_test: Add MSI-X support" patch file following
Kishon's suggestion.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
Change v4->v5:
 - Nothing changed, just to follow the patch set version.
Change v5->v6:
 - Moved PCITEST_MSIX ioctl entry from patch #10 to here.
 - Documented ioctl parameter type associated to
drivers/misc/pci_endpoint_test.c driver.
Change v6->v7:
 - Updated documentation.
 - Added flag that enables or not the MSI-X on the EP features. 
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Moving the EPC_FEATURE_MSIX_AVAILABLE feature set from the
dw_pcie_ep_init() to dw_plat_pcie_ep_init().
Change v9->v10:
 - Update documentation.

 Documentation/PCI/endpoint/pci-test-function.txt  |  2 +-
 Documentation/PCI/endpoint/pci-endpoint.txt       |  4 ++--
 Documentation/PCI/endpoint/pci-test-function.txt  |  4 +++-
 Documentation/PCI/endpoint/pci-test-howto.txt     | 22 ++++++++++++++---
 Documentation/ioctl/ioctl-number.txt              |  1 +
 Documentation/misc-devices/pci-endpoint-test.txt  |  3 +++
 drivers/misc/pci_endpoint_test.c                  | 29 ++++++++++++++++-------
 drivers/pci/controller/dwc/pcie-designware-plat.c |  1 +
 drivers/pci/endpoint/functions/pci-epf-test.c     | 29 +++++++++++++++++++++--
 include/linux/pci-epc.h                           |  1 +
 include/uapi/linux/pcitest.h                      |  1 +
 10 files changed, 79 insertions(+), 16 deletions(-)

diff --git a/Documentation/PCI/endpoint/pci-endpoint.txt b/Documentation/PCI/endpoint/pci-endpoint.txt
index 9b1d668..e86a96b 100644
--- a/Documentation/PCI/endpoint/pci-endpoint.txt
+++ b/Documentation/PCI/endpoint/pci-endpoint.txt
@@ -44,7 +44,7 @@ by the PCI controller driver.
 	 * clear_bar: ops to reset the BAR
 	 * alloc_addr_space: ops to allocate in PCI controller address space
 	 * free_addr_space: ops to free the allocated address space
-	 * raise_irq: ops to raise a legacy or MSI interrupt
+	 * raise_irq: ops to raise a legacy, MSI or MSI-X interrupt
 	 * start: ops to start the PCI link
 	 * stop: ops to stop the PCI link
 
@@ -96,7 +96,7 @@ by the PCI endpoint function driver.
 *) pci_epc_raise_irq()
 
    The PCI endpoint function driver should use pci_epc_raise_irq() to raise
-   Legacy Interrupt or MSI Interrupt.
+   Legacy Interrupt, MSI or MSI-X Interrupt.
 
 *) pci_epc_mem_alloc_addr()
 
diff --git a/Documentation/PCI/endpoint/pci-test-function.txt b/Documentation/PCI/endpoint/pci-test-function.txt
index bf4b5cf..5916f1f 100644
--- a/Documentation/PCI/endpoint/pci-test-function.txt
+++ b/Documentation/PCI/endpoint/pci-test-function.txt
@@ -36,7 +36,7 @@ that the endpoint device must perform.
 Bitfield Description:
   Bit 0		: raise legacy IRQ
   Bit 1		: raise MSI IRQ
-  Bit 2		: raise MSI-X IRQ (reserved for future implementation)
+  Bit 2		: raise MSI-X IRQ
   Bit 3		: read command (read data from RC buffer)
   Bit 4		: write command (write data to RC buffer)
   Bit 5		: copy command (copy data from one RC buffer to another
@@ -75,6 +75,7 @@ for the READ/WRITE/COPY and raise IRQ (Legacy/MSI) commands.
 Possible types:
  - Legacy	: 0
  - MSI		: 1
+ - MSI-X	: 2
 
 *) PCI_ENDPOINT_TEST_IRQ_NUMBER
 
@@ -83,3 +84,4 @@ This register contains the triggered ID interrupt.
 Admissible values:
  - Legacy	: 0
  - MSI		: [1 .. 32]
+ - MSI-X	: [1 .. 2048]
diff --git a/Documentation/PCI/endpoint/pci-test-howto.txt b/Documentation/PCI/endpoint/pci-test-howto.txt
index 75f48c3..65f1a13 100644
--- a/Documentation/PCI/endpoint/pci-test-howto.txt
+++ b/Documentation/PCI/endpoint/pci-test-howto.txt
@@ -45,9 +45,9 @@ The PCI endpoint framework populates the directory with the following
 configurable fields.
 
 	# ls functions/pci_epf_test/func1
-	  baseclass_code	interrupt_pin	revid		subsys_vendor_id
-	  cache_line_size	msi_interrupts	subclass_code	vendorid
-	  deviceid          	progif_code	subsys_id
+	  baseclass_code	interrupt_pin	progif_code	subsys_id
+	  cache_line_size	msi_interrupts	revid		subsys_vendorid
+	  deviceid          	msix_interrupts	subclass_code	vendorid
 
 The PCI endpoint function driver populates these entries with default values
 when the device is bound to the driver. The pci-epf-test driver populates
@@ -67,6 +67,7 @@ device, the following commands can be used.
 	# echo 0x104c > functions/pci_epf_test/func1/vendorid
 	# echo 0xb500 > functions/pci_epf_test/func1/deviceid
 	# echo 16 > functions/pci_epf_test/func1/msi_interrupts
+	# echo 8 > functions/pci_epf_test/func1/msix_interrupts
 
 1.5 Binding pci-epf-test Device to EP Controller
 
@@ -153,6 +154,21 @@ following commands.
 	MSI30:          NOT OKAY
 	MSI31:          NOT OKAY
 	MSI32:          NOT OKAY
+	MSIX1:          OKAY
+	MSIX2:          OKAY
+	MSIX3:          OKAY
+	MSIX4:          OKAY
+	MSIX5:          OKAY
+	MSIX6:          OKAY
+	MSIX7:          OKAY
+	MSIX8:          OKAY
+	MSIX9:          NOT OKAY
+	MSIX10:         NOT OKAY
+	MSIX11:         NOT OKAY
+	MSIX12:         NOT OKAY
+	MSIX13:         NOT OKAY
+	[...]
+	MSIX2048:       NOT OKAY
 
 	Read Tests
 
diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index 480c860..65259d4 100644
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt
@@ -166,6 +166,7 @@ Code  Seq#(hex)	Include File		Comments
 'P'	all	linux/soundcard.h	conflict!
 'P'	60-6F	sound/sscape_ioctl.h	conflict!
 'P'	00-0F	drivers/usb/class/usblp.c	conflict!
+'P'	01-07	drivers/misc/pci_endpoint_test.c	conflict!
 'Q'	all	linux/soundcard.h
 'R'	00-1F	linux/random.h		conflict!
 'R'	01	linux/rfkill.h		conflict!
diff --git a/Documentation/misc-devices/pci-endpoint-test.txt b/Documentation/misc-devices/pci-endpoint-test.txt
index 4ebc359..fdfa0f6 100644
--- a/Documentation/misc-devices/pci-endpoint-test.txt
+++ b/Documentation/misc-devices/pci-endpoint-test.txt
@@ -10,6 +10,7 @@ The PCI driver for the test device performs the following tests
 	*) verifying addresses programmed in BAR
 	*) raise legacy IRQ
 	*) raise MSI IRQ
+	*) raise MSI-X IRQ
 	*) read data
 	*) write data
 	*) copy data
@@ -25,6 +26,8 @@ ioctl
  PCITEST_LEGACY_IRQ: Tests legacy IRQ
  PCITEST_MSI: Tests message signalled interrupts. The MSI number
 	      to be tested should be passed as argument.
+ PCITEST_MSIX: Tests message signalled interrupts. The MSI-X number
+	      to be tested should be passed as argument.
  PCITEST_WRITE: Perform write tests. The size of the buffer should be passed
 		as argument.
  PCITEST_READ: Perform read tests. The size of the buffer should be passed
diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 349794c..f4fef10 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -39,13 +39,14 @@
 
 #define IRQ_TYPE_LEGACY				0
 #define IRQ_TYPE_MSI				1
+#define IRQ_TYPE_MSIX				2
 
 #define PCI_ENDPOINT_TEST_MAGIC			0x0
 
 #define PCI_ENDPOINT_TEST_COMMAND		0x4
 #define COMMAND_RAISE_LEGACY_IRQ		BIT(0)
 #define COMMAND_RAISE_MSI_IRQ			BIT(1)
-/* BIT(2) is reserved for raising MSI-X IRQ command */
+#define COMMAND_RAISE_MSIX_IRQ			BIT(2)
 #define COMMAND_READ				BIT(3)
 #define COMMAND_WRITE				BIT(4)
 #define COMMAND_COPY				BIT(5)
@@ -84,7 +85,7 @@ MODULE_PARM_DESC(no_msi, "Disable MSI interrupt in pci_endpoint_test");
 
 static int irq_type = IRQ_TYPE_MSI;
 module_param(irq_type, int, 0444);
-MODULE_PARM_DESC(irq_type, "IRQ mode selection in pci_endpoint_test (0 - Legacy, 1 - MSI)");
+MODULE_PARM_DESC(irq_type, "IRQ mode selection in pci_endpoint_test (0 - Legacy, 1 - MSI, 2 - MSI-X)");
 
 enum pci_barno {
 	BAR_0,
@@ -202,16 +203,18 @@ static bool pci_endpoint_test_legacy_irq(struct pci_endpoint_test *test)
 }
 
 static bool pci_endpoint_test_msi_irq(struct pci_endpoint_test *test,
-				      u8 msi_num)
+				       u16 msi_num, bool msix)
 {
 	u32 val;
 	struct pci_dev *pdev = test->pdev;
 
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
-				 IRQ_TYPE_MSI);
+				 msix == false ? IRQ_TYPE_MSI :
+				 IRQ_TYPE_MSIX);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, msi_num);
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
-				 COMMAND_RAISE_MSI_IRQ);
+				 msix == false ? COMMAND_RAISE_MSI_IRQ :
+				 COMMAND_RAISE_MSIX_IRQ);
 	val = wait_for_completion_timeout(&test->irq_raised,
 					  msecs_to_jiffies(1000));
 	if (!val)
@@ -456,7 +459,8 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
 		ret = pci_endpoint_test_legacy_irq(test);
 		break;
 	case PCITEST_MSI:
-		ret = pci_endpoint_test_msi_irq(test, arg);
+	case PCITEST_MSIX:
+		ret = pci_endpoint_test_msi_irq(test, arg, cmd == PCITEST_MSIX);
 		break;
 	case PCITEST_WRITE:
 		ret = pci_endpoint_test_write(test, arg);
@@ -542,6 +546,12 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 			dev_err(dev, "Failed to get MSI interrupts\n");
 		test->num_irqs = irq;
 		break;
+	case IRQ_TYPE_MSIX:
+		irq = pci_alloc_irq_vectors(pdev, 1, 2048, PCI_IRQ_MSIX);
+		if (irq < 0)
+			dev_err(dev, "Failed to get MSI-X interrupts\n");
+		test->num_irqs = irq;
+		break;
 	default:
 		dev_err(dev, "Invalid IRQ type selected\n");
 	}
@@ -558,8 +568,9 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 				       pci_endpoint_test_irqhandler,
 				       IRQF_SHARED, DRV_MODULE_NAME, test);
 		if (err)
-			dev_err(dev, "failed to request IRQ %d for MSI %d\n",
-				pci_irq_vector(pdev, i), i + 1);
+			dev_err(dev, "Failed to request IRQ %d for MSI%s %d\n",
+				pci_irq_vector(pdev, i),
+				irq_type == IRQ_TYPE_MSIX ? "-X" : "", i + 1);
 	}
 
 	for (bar = BAR_0; bar <= BAR_5; bar++) {
@@ -625,6 +636,7 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 
 err_disable_msi:
 	pci_disable_msi(pdev);
+	pci_disable_msix(pdev);
 	pci_release_regions(pdev);
 
 err_disable_pdev:
@@ -656,6 +668,7 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
 	for (i = 0; i < test->num_irqs; i++)
 		devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), test);
 	pci_disable_msi(pdev);
+	pci_disable_msix(pdev);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 }
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 160714d..d2dd0c7 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -77,6 +77,7 @@ static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep)
 		dw_pcie_ep_reset_bar(pci, bar);
 
 	epc->features |= EPC_FEATURE_NO_LINKUP_NOTIFIER;
+	epc->features |= EPC_FEATURE_MSIX_AVAILABLE;
 }
 
 static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index eb9cd00..123f58c 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -20,10 +20,11 @@
 
 #define IRQ_TYPE_LEGACY			0
 #define IRQ_TYPE_MSI			1
+#define IRQ_TYPE_MSIX			2
 
 #define COMMAND_RAISE_LEGACY_IRQ	BIT(0)
 #define COMMAND_RAISE_MSI_IRQ		BIT(1)
-/* BIT(2) is reserved for raising MSI-X IRQ command */
+#define COMMAND_RAISE_MSIX_IRQ		BIT(2)
 #define COMMAND_READ			BIT(3)
 #define COMMAND_WRITE			BIT(4)
 #define COMMAND_COPY			BIT(5)
@@ -47,6 +48,7 @@ struct pci_epf_test {
 	struct pci_epf		*epf;
 	enum pci_barno		test_reg_bar;
 	bool			linkup_notifier;
+	bool			msix_available;
 	struct delayed_work	cmd_handler;
 };
 
@@ -266,6 +268,9 @@ static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test, u8 irq_type,
 	case IRQ_TYPE_MSI:
 		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, irq);
 		break;
+	case IRQ_TYPE_MSIX:
+		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSIX, irq);
+		break;
 	default:
 		dev_err(dev, "Failed to raise IRQ, unknown type\n");
 		break;
@@ -292,7 +297,7 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
 	reg->command = 0;
 	reg->status = 0;
 
-	if (reg->irq_type > IRQ_TYPE_MSI) {
+	if (reg->irq_type > IRQ_TYPE_MSIX) {
 		dev_err(dev, "Failed to detect IRQ type\n");
 		goto reset_handler;
 	}
@@ -346,6 +351,16 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
 		goto reset_handler;
 	}
 
+	if (command & COMMAND_RAISE_MSIX_IRQ) {
+		count = pci_epc_get_msix(epc, epf->func_no);
+		if (reg->irq_number > count || count <= 0)
+			goto reset_handler;
+		reg->status = STATUS_IRQ_RAISED;
+		pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSIX,
+				  reg->irq_number);
+		goto reset_handler;
+	}
+
 reset_handler:
 	queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler,
 			   msecs_to_jiffies(1));
@@ -459,6 +474,8 @@ static int pci_epf_test_bind(struct pci_epf *epf)
 	else
 		epf_test->linkup_notifier = true;
 
+	epf_test->msix_available = epc->features & EPC_FEATURE_MSIX_AVAILABLE;
+
 	epf_test->test_reg_bar = EPC_FEATURE_GET_BAR(epc->features);
 
 	ret = pci_epc_write_header(epc, epf->func_no, header);
@@ -481,6 +498,14 @@ static int pci_epf_test_bind(struct pci_epf *epf)
 		return ret;
 	}
 
+	if (epf_test->msix_available) {
+		ret = pci_epc_set_msix(epc, epf->func_no, epf->msix_interrupts);
+		if (ret) {
+			dev_err(dev, "MSI-X configuration failed\n");
+			return ret;
+		}
+	}
+
 	if (!epf_test->linkup_notifier)
 		queue_work(kpcitest_workqueue, &epf_test->cmd_handler.work);
 
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index bb2395b..37dab81 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -102,6 +102,7 @@ struct pci_epc {
 
 #define EPC_FEATURE_NO_LINKUP_NOTIFIER		BIT(0)
 #define EPC_FEATURE_BAR_MASK			(BIT(1) | BIT(2) | BIT(3))
+#define EPC_FEATURE_MSIX_AVAILABLE		BIT(4)
 #define EPC_FEATURE_SET_BAR(features, bar)	\
 		(features |= (EPC_FEATURE_BAR_MASK & (bar << 1)))
 #define EPC_FEATURE_GET_BAR(features)		\
diff --git a/include/uapi/linux/pcitest.h b/include/uapi/linux/pcitest.h
index 953cf03..d746fb1 100644
--- a/include/uapi/linux/pcitest.h
+++ b/include/uapi/linux/pcitest.h
@@ -16,5 +16,6 @@
 #define PCITEST_WRITE		_IOW('P', 0x4, unsigned long)
 #define PCITEST_READ		_IOW('P', 0x5, unsigned long)
 #define PCITEST_COPY		_IOW('P', 0x6, unsigned long)
+#define PCITEST_MSIX		_IOW('P', 0x7, int)
 
 #endif /* __UAPI_LINUX_PCITEST_H */
-- 
2.7.4

[PATCH v10 10/12] pci_endpoint_test: Add 2 ioctl commands

[Gustavo Pimentel]

Add MSI-X support and update driver documentation accordingly.

Add 2 new IOCTL commands:
 - Allow to reconfigure driver IRQ type in runtime.
 - Allow to retrieve current driver IRQ type configured.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
Change v2->v3:
 - New patch file created base on the previous patch
"misc: pci_endpoint_test: Add MSI-X support" patch file following
Kishon's suggestion.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
Change v4->v5:
 - Nothing changed, just to follow the patch set version.
Change v5->v6:
 - Moved PCITEST_SET_IRQTYPE and PCITEST_GET_IRQTYPE ioctl entries
from patch #10 to here.
 - Increased ioctl parameters range associated to
drivers/misc/pci_endpoint_test.c driver.
Change v6->v7:
 - irq_type variable update just before returning the function.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Added a extra parameter to pci_endpoint_test_alloc_irq_vectors,
that specifies which irq type should be allocated.
Change v9->v10:
 - Nothing changed, just to follow the patch set version.

 Documentation/ioctl/ioctl-number.txt             |   2 +-
 Documentation/misc-devices/pci-endpoint-test.txt |   3 +
 drivers/misc/pci_endpoint_test.c                 | 176 +++++++++++++++++------
 include/uapi/linux/pcitest.h                     |   2 +
 4 files changed, 136 insertions(+), 47 deletions(-)

diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index 65259d4..c15c4f3 100644
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt
@@ -166,7 +166,7 @@ Code  Seq#(hex)	Include File		Comments
 'P'	all	linux/soundcard.h	conflict!
 'P'	60-6F	sound/sscape_ioctl.h	conflict!
 'P'	00-0F	drivers/usb/class/usblp.c	conflict!
-'P'	01-07	drivers/misc/pci_endpoint_test.c	conflict!
+'P'	01-09	drivers/misc/pci_endpoint_test.c	conflict!
 'Q'	all	linux/soundcard.h
 'R'	00-1F	linux/random.h		conflict!
 'R'	01	linux/rfkill.h		conflict!
diff --git a/Documentation/misc-devices/pci-endpoint-test.txt b/Documentation/misc-devices/pci-endpoint-test.txt
index fdfa0f6..58ccca4 100644
--- a/Documentation/misc-devices/pci-endpoint-test.txt
+++ b/Documentation/misc-devices/pci-endpoint-test.txt
@@ -28,6 +28,9 @@ ioctl
 	      to be tested should be passed as argument.
  PCITEST_MSIX: Tests message signalled interrupts. The MSI-X number
 	      to be tested should be passed as argument.
+ PCITEST_SET_IRQTYPE: Changes driver IRQ type configuration. The IRQ type
+	      should be passed as argument (0: Legacy, 1:MSI, 2:MSI-X).
+ PCITEST_GET_IRQTYPE: Gets driver IRQ type configuration.
  PCITEST_WRITE: Perform write tests. The size of the buffer should be passed
 		as argument.
  PCITEST_READ: Perform read tests. The size of the buffer should be passed
diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index f4fef10..ce4b79a 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -157,6 +157,88 @@ static irqreturn_t pci_endpoint_test_irqhandler(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static void pci_endpoint_test_free_irq_vectors(struct pci_endpoint_test *test)
+{
+	int i;
+	struct pci_dev *pdev = test->pdev;
+	struct device *dev = &pdev->dev;
+
+	for (i = 0; i < test->num_irqs; i++)
+		devm_free_irq(dev, pci_irq_vector(pdev, i), test);
+
+	test->num_irqs = 0;
+}
+
+static bool pci_endpoint_test_alloc_irq_vectors(struct pci_endpoint_test *test,
+						int type)
+{
+	int irq = -1;
+	struct pci_dev *pdev = test->pdev;
+	struct device *dev = &pdev->dev;
+	bool res = true;
+
+	switch (type) {
+	case IRQ_TYPE_LEGACY:
+		irq = 0;
+		break;
+	case IRQ_TYPE_MSI:
+		irq = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI);
+		if (irq < 0)
+			dev_err(dev, "Failed to get MSI interrupts\n");
+		break;
+	case IRQ_TYPE_MSIX:
+		irq = pci_alloc_irq_vectors(pdev, 1, 2048, PCI_IRQ_MSIX);
+		if (irq < 0)
+			dev_err(dev, "Failed to get MSI-X interrupts\n");
+		break;
+	default:
+		dev_err(dev, "Invalid IRQ type selected\n");
+	}
+
+	if (irq < 0) {
+		irq = 0;
+		res = false;
+	}
+	test->num_irqs = irq;
+
+	return res;
+}
+
+static void pci_endpoint_test_release_irq(struct pci_endpoint_test *test)
+{
+	struct pci_dev *pdev = test->pdev;
+
+	pci_disable_msi(pdev);
+	pci_disable_msix(pdev);
+}
+
+static bool pci_endpoint_test_request_irq(struct pci_endpoint_test *test)
+{
+	int i;
+	int err;
+	struct pci_dev *pdev = test->pdev;
+	struct device *dev = &pdev->dev;
+
+	err = devm_request_irq(dev, pdev->irq, pci_endpoint_test_irqhandler,
+			       IRQF_SHARED, DRV_MODULE_NAME, test);
+	if (err) {
+		dev_err(dev, "Failed to request IRQ %d\n", pdev->irq);
+		return false;
+	}
+
+	for (i = 1; i < test->num_irqs; i++) {
+		err = devm_request_irq(dev, pci_irq_vector(pdev, i),
+				       pci_endpoint_test_irqhandler,
+				       IRQF_SHARED, DRV_MODULE_NAME, test);
+		if (err)
+			dev_err(dev, "Failed to request IRQ %d for MSI%s %d\n",
+				pci_irq_vector(pdev, i),
+				irq_type == IRQ_TYPE_MSIX ? "-X" : "", i + 1);
+	}
+
+	return true;
+}
+
 static bool pci_endpoint_test_bar(struct pci_endpoint_test *test,
 				  enum pci_barno barno)
 {
@@ -440,6 +522,38 @@ static bool pci_endpoint_test_read(struct pci_endpoint_test *test, size_t size)
 	return ret;
 }
 
+static bool pci_endpoint_test_set_irq(struct pci_endpoint_test *test,
+				      int req_irq_type)
+{
+	struct pci_dev *pdev = test->pdev;
+	struct device *dev = &pdev->dev;
+
+	if (req_irq_type < IRQ_TYPE_LEGACY || req_irq_type > IRQ_TYPE_MSIX) {
+		dev_err(dev, "Invalid IRQ type option\n");
+		return false;
+	}
+
+	if (irq_type == req_irq_type)
+		return true;
+
+	pci_endpoint_test_free_irq_vectors(test);
+	pci_endpoint_test_release_irq(test);
+
+	if (!pci_endpoint_test_alloc_irq_vectors(test, req_irq_type)) {
+		pci_endpoint_test_release_irq(test);
+		return false;
+	}
+
+	if (!pci_endpoint_test_request_irq(test)) {
+		pci_endpoint_test_release_irq(test);
+		return false;
+	}
+
+	irq_type = req_irq_type;
+
+	return true;
+}
+
 static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
 				    unsigned long arg)
 {
@@ -471,6 +585,12 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
 	case PCITEST_COPY:
 		ret = pci_endpoint_test_copy(test, arg);
 		break;
+	case PCITEST_SET_IRQTYPE:
+		ret = pci_endpoint_test_set_irq(test, arg);
+		break;
+	case PCITEST_GET_IRQTYPE:
+		ret = irq_type;
+		break;
 	}
 
 ret:
@@ -486,9 +606,7 @@ static const struct file_operations pci_endpoint_test_fops = {
 static int pci_endpoint_test_probe(struct pci_dev *pdev,
 				   const struct pci_device_id *ent)
 {
-	int i;
 	int err;
-	int irq = 0;
 	int id;
 	char name[20];
 	enum pci_barno bar;
@@ -537,41 +655,11 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 
 	pci_set_master(pdev);
 
-	switch (irq_type) {
-	case IRQ_TYPE_LEGACY:
-		break;
-	case IRQ_TYPE_MSI:
-		irq = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI);
-		if (irq < 0)
-			dev_err(dev, "Failed to get MSI interrupts\n");
-		test->num_irqs = irq;
-		break;
-	case IRQ_TYPE_MSIX:
-		irq = pci_alloc_irq_vectors(pdev, 1, 2048, PCI_IRQ_MSIX);
-		if (irq < 0)
-			dev_err(dev, "Failed to get MSI-X interrupts\n");
-		test->num_irqs = irq;
-		break;
-	default:
-		dev_err(dev, "Invalid IRQ type selected\n");
-	}
-
-	err = devm_request_irq(dev, pdev->irq, pci_endpoint_test_irqhandler,
-			       IRQF_SHARED, DRV_MODULE_NAME, test);
-	if (err) {
-		dev_err(dev, "Failed to request IRQ %d\n", pdev->irq);
-		goto err_disable_msi;
-	}
+	if (!pci_endpoint_test_alloc_irq_vectors(test, irq_type))
+		goto err_disable_irq;
 
-	for (i = 1; i < irq; i++) {
-		err = devm_request_irq(dev, pci_irq_vector(pdev, i),
-				       pci_endpoint_test_irqhandler,
-				       IRQF_SHARED, DRV_MODULE_NAME, test);
-		if (err)
-			dev_err(dev, "Failed to request IRQ %d for MSI%s %d\n",
-				pci_irq_vector(pdev, i),
-				irq_type == IRQ_TYPE_MSIX ? "-X" : "", i + 1);
-	}
+	if (!pci_endpoint_test_request_irq(test))
+		goto err_disable_irq;
 
 	for (bar = BAR_0; bar <= BAR_5; bar++) {
 		if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
@@ -631,12 +719,10 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 			pci_iounmap(pdev, test->bar[bar]);
 	}
 
-	for (i = 0; i < irq; i++)
-		devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), test);
+	pci_endpoint_test_free_irq_vectors(test);
 
-err_disable_msi:
-	pci_disable_msi(pdev);
-	pci_disable_msix(pdev);
+err_disable_irq:
+	pci_endpoint_test_release_irq(test);
 	pci_release_regions(pdev);
 
 err_disable_pdev:
@@ -648,7 +734,6 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 static void pci_endpoint_test_remove(struct pci_dev *pdev)
 {
 	int id;
-	int i;
 	enum pci_barno bar;
 	struct pci_endpoint_test *test = pci_get_drvdata(pdev);
 	struct miscdevice *misc_device = &test->miscdev;
@@ -665,10 +750,9 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
 		if (test->bar[bar])
 			pci_iounmap(pdev, test->bar[bar]);
 	}
-	for (i = 0; i < test->num_irqs; i++)
-		devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), test);
-	pci_disable_msi(pdev);
-	pci_disable_msix(pdev);
+	pci_endpoint_test_free_irq_vectors(test);
+
+	pci_endpoint_test_release_irq(test);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 }
diff --git a/include/uapi/linux/pcitest.h b/include/uapi/linux/pcitest.h
index d746fb1..cbf422e 100644
--- a/include/uapi/linux/pcitest.h
+++ b/include/uapi/linux/pcitest.h
@@ -17,5 +17,7 @@
 #define PCITEST_READ		_IOW('P', 0x5, unsigned long)
 #define PCITEST_COPY		_IOW('P', 0x6, unsigned long)
 #define PCITEST_MSIX		_IOW('P', 0x7, int)
+#define PCITEST_SET_IRQTYPE	_IOW('P', 0x8, int)
+#define PCITEST_GET_IRQTYPE	_IO('P', 0x9)
 
 #endif /* __UAPI_LINUX_PCITEST_H */
-- 
2.7.4

[PATCH v10 11/12] tools: PCI: Add MSI-X support

[Gustavo Pimentel]

Add MSI-X support to pcitest tool.

Modify pcitest.sh script to accommodate MSI-X interrupt tests.

Update documentation accordingly.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v1->v2:
 - Allow IRQ type driver reconfiguring in runtime, follwing Kishon's
suggestion.
Change v2->v3:
 - Nothing changed, just to follow the patch set version.
Change v3->v4:
 - Rebased to Lorenzo's master branch v4.18-rc1.
Change v4->v5:
 - Nothing changed, just to follow the patch set version.
Change v5->v6:
 - Moved PCITEST_MSIX ioctl entry to patch #8.
 - Moved PCITEST_SET_IRQTYPE and PCITEST_GET_IRQTYPE ioctl entries
to patch #9.
Change v6->v7:
 - Nothing changed, just to follow the patch set version.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Nothing changed, just to follow the patch set version.
Change v9->v10:
 - Updated documentation.

 Documentation/PCI/endpoint/pci-test-howto.txt | 36 +++++++++++--------
 tools/pci/pcitest.c                           | 51 ++++++++++++++++++++++++++-
 tools/pci/pcitest.sh                          | 15 ++++++++
 3 files changed, 87 insertions(+), 15 deletions(-)

diff --git a/Documentation/PCI/endpoint/pci-test-howto.txt b/Documentation/PCI/endpoint/pci-test-howto.txt
index 65f1a13..e40cf0f 100644
--- a/Documentation/PCI/endpoint/pci-test-howto.txt
+++ b/Documentation/PCI/endpoint/pci-test-howto.txt
@@ -121,7 +121,9 @@ following commands.
 
 	Interrupt tests
 
+	SET IRQ TYPE TO LEGACY:         OKAY
 	LEGACY IRQ:     NOT OKAY
+	SET IRQ TYPE TO MSI:            OKAY
 	MSI1:           OKAY
 	MSI2:           OKAY
 	MSI3:           OKAY
@@ -154,24 +156,30 @@ following commands.
 	MSI30:          NOT OKAY
 	MSI31:          NOT OKAY
 	MSI32:          NOT OKAY
-	MSIX1:          OKAY
-	MSIX2:          OKAY
-	MSIX3:          OKAY
-	MSIX4:          OKAY
-	MSIX5:          OKAY
-	MSIX6:          OKAY
-	MSIX7:          OKAY
-	MSIX8:          OKAY
-	MSIX9:          NOT OKAY
-	MSIX10:         NOT OKAY
-	MSIX11:         NOT OKAY
-	MSIX12:         NOT OKAY
-	MSIX13:         NOT OKAY
+	SET IRQ TYPE TO MSI-X:          OKAY
+	MSI-X1:         OKAY
+	MSI-X2:         OKAY
+	MSI-X3:         OKAY
+	MSI-X4:         OKAY
+	MSI-X5:         OKAY
+	MSI-X6:         OKAY
+	MSI-X7:         OKAY
+	MSI-X8:         OKAY
+	MSI-X9:         NOT OKAY
+	MSI-X10:        NOT OKAY
+	MSI-X11:        NOT OKAY
+	MSI-X12:        NOT OKAY
+	MSI-X13:        NOT OKAY
+	MSI-X14:        NOT OKAY
+	MSI-X15:        NOT OKAY
+	MSI-X16:        NOT OKAY
 	[...]
-	MSIX2048:       NOT OKAY
+	MSI-X2047:      NOT OKAY
+	MSI-X2048:      NOT OKAY
 
 	Read Tests
 
+	SET IRQ TYPE TO MSI:            OKAY
 	READ (      1 bytes):           OKAY
 	READ (   1024 bytes):           OKAY
 	READ (   1025 bytes):           OKAY
diff --git a/tools/pci/pcitest.c b/tools/pci/pcitest.c
index 9074b47..af146bb 100644
--- a/tools/pci/pcitest.c
+++ b/tools/pci/pcitest.c
@@ -31,12 +31,17 @@
 #define BILLION 1E9
 
 static char *result[] = { "NOT OKAY", "OKAY" };
+static char *irq[] = { "LEGACY", "MSI", "MSI-X" };
 
 struct pci_test {
 	char		*device;
 	char		barnum;
 	bool		legacyirq;
 	unsigned int	msinum;
+	unsigned int	msixnum;
+	int		irqtype;
+	bool		set_irqtype;
+	bool		get_irqtype;
 	bool		read;
 	bool		write;
 	bool		copy;
@@ -65,6 +70,24 @@ static int run_test(struct pci_test *test)
 			fprintf(stdout, "%s\n", result[ret]);
 	}
 
+	if (test->set_irqtype) {
+		ret = ioctl(fd, PCITEST_SET_IRQTYPE, test->irqtype);
+		fprintf(stdout, "SET IRQ TYPE TO %s:\t\t", irq[test->irqtype]);
+		if (ret < 0)
+			fprintf(stdout, "FAILED\n");
+		else
+			fprintf(stdout, "%s\n", result[ret]);
+	}
+
+	if (test->get_irqtype) {
+		ret = ioctl(fd, PCITEST_GET_IRQTYPE);
+		fprintf(stdout, "GET IRQ TYPE:\t\t");
+		if (ret < 0)
+			fprintf(stdout, "FAILED\n");
+		else
+			fprintf(stdout, "%s\n", irq[ret]);
+	}
+
 	if (test->legacyirq) {
 		ret = ioctl(fd, PCITEST_LEGACY_IRQ, 0);
 		fprintf(stdout, "LEGACY IRQ:\t");
@@ -83,6 +106,15 @@ static int run_test(struct pci_test *test)
 			fprintf(stdout, "%s\n", result[ret]);
 	}
 
+	if (test->msixnum > 0 && test->msixnum <= 2048) {
+		ret = ioctl(fd, PCITEST_MSIX, test->msixnum);
+		fprintf(stdout, "MSI-X%d:\t\t", test->msixnum);
+		if (ret < 0)
+			fprintf(stdout, "TEST FAILED\n");
+		else
+			fprintf(stdout, "%s\n", result[ret]);
+	}
+
 	if (test->write) {
 		ret = ioctl(fd, PCITEST_WRITE, test->size);
 		fprintf(stdout, "WRITE (%7ld bytes):\t\t", test->size);
@@ -133,7 +165,7 @@ int main(int argc, char **argv)
 	/* set default endpoint device */
 	test->device = "/dev/pci-endpoint-test.0";
 
-	while ((c = getopt(argc, argv, "D:b:m:lrwcs:")) != EOF)
+	while ((c = getopt(argc, argv, "D:b:m:x:i:Ilrwcs:")) != EOF)
 	switch (c) {
 	case 'D':
 		test->device = optarg;
@@ -151,6 +183,20 @@ int main(int argc, char **argv)
 		if (test->msinum < 1 || test->msinum > 32)
 			goto usage;
 		continue;
+	case 'x':
+		test->msixnum = atoi(optarg);
+		if (test->msixnum < 1 || test->msixnum > 2048)
+			goto usage;
+		continue;
+	case 'i':
+		test->irqtype = atoi(optarg);
+		if (test->irqtype < 0 || test->irqtype > 2)
+			goto usage;
+		test->set_irqtype = true;
+		continue;
+	case 'I':
+		test->get_irqtype = true;
+		continue;
 	case 'r':
 		test->read = true;
 		continue;
@@ -173,6 +219,9 @@ int main(int argc, char **argv)
 			"\t-D <dev>		PCI endpoint test device {default: /dev/pci-endpoint-test.0}\n"
 			"\t-b <bar num>		BAR test (bar number between 0..5)\n"
 			"\t-m <msi num>		MSI test (msi number between 1..32)\n"
+			"\t-x <msix num>	\tMSI-X test (msix number between 1..2048)\n"
+			"\t-i <irq type>	\tSet IRQ type (0 - Legacy, 1 - MSI, 2 - MSI-X)\n"
+			"\t-I			Get current IRQ type configured\n"
 			"\t-l			Legacy IRQ test\n"
 			"\t-r			Read buffer test\n"
 			"\t-w			Write buffer test\n"
diff --git a/tools/pci/pcitest.sh b/tools/pci/pcitest.sh
index 77e8c85..75ed48f 100644
--- a/tools/pci/pcitest.sh
+++ b/tools/pci/pcitest.sh
@@ -16,7 +16,10 @@ echo
 echo "Interrupt tests"
 echo
 
+pcitest -i 0
 pcitest -l
+
+pcitest -i 1
 msi=1
 
 while [ $msi -lt 33 ]
@@ -26,9 +29,21 @@ do
 done
 echo
 
+pcitest -i 2
+msix=1
+
+while [ $msix -lt 2049 ]
+do
+        pcitest -x $msix
+        msix=`expr $msix + 1`
+done
+echo
+
 echo "Read Tests"
 echo
 
+pcitest -i 1
+
 pcitest -r -s 1
 pcitest -r -s 1024
 pcitest -r -s 1025
-- 
2.7.4

[PATCH v10 12/12] PCI: endpoint: Add MSI set maximum restriction

[Gustavo Pimentel]

Add pci_epc_set_msi() maximum 32 interrupts validation.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v4->v5:
 - New patch file.
Change v5->v6:
 - Nothing changed, just to follow the patch set version.
Change v6->v7:
 - Nothing changed, just to follow the patch set version.
Change v7->v8:
 - Re-sending the patch series.
Change v8->v9:
 - Nothing changed, just to follow the patch set version.
Change v9->v10:
 - Nothing changed, just to follow the patch set version.

 drivers/pci/endpoint/pci-epc-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index c72e656..094dcc3 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -201,7 +201,8 @@ int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts)
 	u8 encode_int;
 	unsigned long flags;
 
-	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
+	    interrupts > 32)
 		return -EINVAL;
 
 	if (!epc->ops->set_msi)
-- 
2.7.4