Merge tag 'fpga-for-5.9' of git://git.kernel.org/pub/scm/linux/kernel…

…/git/mdf/linux-fpga into char-misc-next

Moritz writes:

FPGA Manager changes for 5.9-rc1

Here is the (slightly larger than usual) patch set for the 5.9-rc1 merge
window.

DFL:
- Xu's changes add support for AFU interrupt handling and puts them to
  use for error handling.
- Xu's other change also adds another device-id for the Intel FPGA PAC N3000.
- John's change converts from using get_user_pages() to
  pin_user_pages().
- Gustavo's patch cleans up some of the allocation by using
  struct_size().

Xilinx:
- Luca's changes clean up the xilinx-spi and xilinx-slave-serial drivers
  and updates the comments and dt-bindings to reflect the fact it also
  supports 7 series devices.

Core:
- Tom cleaned up the fpga-bridge / fpga-mgr core by removing some
  dead-stores.

All patches have been reviewed on the mailing list, and have been in the
last few linux-next releases (as part of my for-next branch) without issues.

Signed-off-by: Moritz Fischer <[email protected]>

* tag 'fpga-for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/mdf/linux-fpga:
  fpga: dfl: pci: add device id for Intel FPGA PAC N3000
  Documentation: fpga: dfl: add descriptions for interrupt related interfaces.
  fpga: dfl: afu: add AFU interrupt support
  fpga: dfl: fme: add interrupt support for global error reporting
  fpga: dfl: afu: add interrupt support for port error reporting
  fpga: dfl: introduce interrupt trigger setting API
  fpga: dfl: pci: add irq info for feature devices enumeration
  fpga: dfl: parse interrupt info for feature devices on enumeration
  fpga manager: xilinx-spi: check INIT_B pin during write_init
  dt-bindings: fpga: xilinx-slave-serial: add optional INIT_B GPIO
  fpga: Fix dead store in fpga-bridge.c
  fpga: Fix dead store fpga-mgr.c
  fpga: dfl: Use struct_size() in kzalloc()
  fpga manager: xilinx-spi: remove unneeded, mistyped variables
  fpga manager: xilinx-spi: valid for the 7 Series too
  dt-bindings: fpga: xilinx-slave-serial: valid for the 7 Series too
  fpga: dfl: afu: convert get_user_pages() --> pin_user_pages()

Documentation/devicetree/bindings/fpga/xilinx-slave-serial.txt

@@ -1,18 +1,25 @@
 Xilinx Slave Serial SPI FPGA Manager
 
-Xilinx Spartan-6 FPGAs support a method of loading the bitstream over
-what is referred to as "slave serial" interface.
+Xilinx Spartan-6 and 7 Series FPGAs support a method of loading the
+bitstream over what is referred to as "slave serial" interface.
 The slave serial link is not technically SPI, and might require extra
 circuits in order to play nicely with other SPI slaves on the same bus.
 
-See https://www.xilinx.com/support/documentation/user_guides/ug380.pdf
+See:
+- https://www.xilinx.com/support/documentation/user_guides/ug380.pdf
+- https://www.xilinx.com/support/documentation/user_guides/ug470_7Series_Config.pdf
+- https://www.xilinx.com/support/documentation/application_notes/xapp583-fpga-configuration.pdf
 
 Required properties:
 - compatible: should contain "xlnx,fpga-slave-serial"
 - reg: spi chip select of the FPGA
 - prog_b-gpios: config pin (referred to as PROGRAM_B in the manual)
 - done-gpios: config status pin (referred to as DONE in the manual)
 
+Optional properties:
+- init-b-gpios: initialization status and configuration error pin
+                (referred to as INIT_B in the manual)
+
 Example for full FPGA configuration:
 
 	fpga-region0 {
@@ -37,7 +44,8 @@ Example for full FPGA configuration:
 			spi-max-frequency = <60000000>;
 			spi-cpha;
 			reg = <0>;
-			done-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
 			prog_b-gpios = <&gpio0 29 GPIO_ACTIVE_LOW>;
+			init-b-gpios = <&gpio0 28 GPIO_ACTIVE_LOW>;
+			done-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
 		};
 	};

Documentation/fpga/dfl.rst

@@ -89,6 +89,8 @@ The following functions are exposed through ioctls:
 - Program bitstream (DFL_FPGA_FME_PORT_PR)
 - Assign port to PF (DFL_FPGA_FME_PORT_ASSIGN)
 - Release port from PF (DFL_FPGA_FME_PORT_RELEASE)
+- Get number of irqs of FME global error (DFL_FPGA_FME_ERR_GET_IRQ_NUM)
+- Set interrupt trigger for FME error (DFL_FPGA_FME_ERR_SET_IRQ)
 
 More functions are exposed through sysfs
 (/sys/class/fpga_region/regionX/dfl-fme.n/):
@@ -149,6 +151,10 @@ The following functions are exposed through ioctls:
 - Map DMA buffer (DFL_FPGA_PORT_DMA_MAP)
 - Unmap DMA buffer (DFL_FPGA_PORT_DMA_UNMAP)
 - Reset AFU (DFL_FPGA_PORT_RESET)
+- Get number of irqs of port error (DFL_FPGA_PORT_ERR_GET_IRQ_NUM)
+- Set interrupt trigger for port error (DFL_FPGA_PORT_ERR_SET_IRQ)
+- Get number of irqs of UINT (DFL_FPGA_PORT_UINT_GET_IRQ_NUM)
+- Set interrupt trigger for UINT (DFL_FPGA_PORT_UINT_SET_IRQ)
 
 DFL_FPGA_PORT_RESET:
   reset the FPGA Port and its AFU. Userspace can do Port
@@ -462,6 +468,19 @@ since they are system-wide counters on FPGA device.
 The current driver does not support sampling. So "perf record" is unsupported.
 
 
+Interrupt support
+=================
+Some FME and AFU private features are able to generate interrupts. As mentioned
+above, users could call ioctl (DFL_FPGA_*_GET_IRQ_NUM) to know whether or how
+many interrupts are supported for this private feature. Drivers also implement
+an eventfd based interrupt handling mechanism for users to get notified when
+interrupt happens. Users could set eventfds to driver via
+ioctl (DFL_FPGA_*_SET_IRQ), and then poll/select on these eventfds waiting for
+notification.
+In Current DFL, 3 sub features (Port error, FME global error and AFU interrupt)
+support interrupts.
+
+
 Add new FIUs support
 ====================
 It's possible that developers made some new function blocks (FIUs) under this

drivers/fpga/dfl-afu-dma-region.c

@@ -16,15 +16,6 @@
 
 #include "dfl-afu.h"
 
-static void put_all_pages(struct page **pages, int npages)
-{
-	int i;
-
-	for (i = 0; i < npages; i++)
-		if (pages[i])
-			put_page(pages[i]);
-}
-
 void afu_dma_region_init(struct dfl_feature_platform_data *pdata)
 {
 	struct dfl_afu *afu = dfl_fpga_pdata_get_private(pdata);
@@ -57,22 +48,22 @@ static int afu_dma_pin_pages(struct dfl_feature_platform_data *pdata,
 		goto unlock_vm;
 	}
 
-	pinned = get_user_pages_fast(region->user_addr, npages, FOLL_WRITE,
+	pinned = pin_user_pages_fast(region->user_addr, npages, FOLL_WRITE,
 				     region->pages);
 	if (pinned < 0) {
 		ret = pinned;
 		goto free_pages;
 	} else if (pinned != npages) {
 		ret = -EFAULT;
-		goto put_pages;
+		goto unpin_pages;
 	}
 
 	dev_dbg(dev, "%d pages pinned\n", pinned);
 
 	return 0;
 
-put_pages:
-	put_all_pages(region->pages, pinned);
+unpin_pages:
+	unpin_user_pages(region->pages, pinned);
 free_pages:
 	kfree(region->pages);
 unlock_vm:
@@ -94,7 +85,7 @@ static void afu_dma_unpin_pages(struct dfl_feature_platform_data *pdata,
 	long npages = region->length >> PAGE_SHIFT;
 	struct device *dev = &pdata->dev->dev;
 
-	put_all_pages(region->pages, npages);
+	unpin_user_pages(region->pages, npages);
 	kfree(region->pages);
 	account_locked_vm(current->mm, npages, false);
 

drivers/fpga/dfl-afu-error.c

@@ -14,6 +14,7 @@
  *   Mitchel Henry <[email protected]>
  */
 
+#include <linux/fpga-dfl.h>
 #include <linux/uaccess.h>
 
 #include "dfl-afu.h"
@@ -219,6 +220,21 @@ static void port_err_uinit(struct platform_device *pdev,
 	afu_port_err_mask(&pdev->dev, true);
 }
 
+static long
+port_err_ioctl(struct platform_device *pdev, struct dfl_feature *feature,
+	       unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case DFL_FPGA_PORT_ERR_GET_IRQ_NUM:
+		return dfl_feature_ioctl_get_num_irqs(pdev, feature, arg);
+	case DFL_FPGA_PORT_ERR_SET_IRQ:
+		return dfl_feature_ioctl_set_irq(pdev, feature, arg);
+	default:
+		dev_dbg(&pdev->dev, "%x cmd not handled", cmd);
+		return -ENODEV;
+	}
+}
+
 const struct dfl_feature_id port_err_id_table[] = {
 	{.id = PORT_FEATURE_ID_ERROR,},
 	{0,}
@@ -227,4 +243,5 @@ const struct dfl_feature_id port_err_id_table[] = {
 const struct dfl_feature_ops port_err_ops = {
 	.init = port_err_init,
 	.uinit = port_err_uinit,
+	.ioctl = port_err_ioctl,
 };

drivers/fpga/dfl-afu-main.c

@@ -529,6 +529,30 @@ static const struct dfl_feature_ops port_stp_ops = {
 	.init = port_stp_init,
 };
 
+static long
+port_uint_ioctl(struct platform_device *pdev, struct dfl_feature *feature,
+		unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case DFL_FPGA_PORT_UINT_GET_IRQ_NUM:
+		return dfl_feature_ioctl_get_num_irqs(pdev, feature, arg);
+	case DFL_FPGA_PORT_UINT_SET_IRQ:
+		return dfl_feature_ioctl_set_irq(pdev, feature, arg);
+	default:
+		dev_dbg(&pdev->dev, "%x cmd not handled", cmd);
+		return -ENODEV;
+	}
+}
+
+static const struct dfl_feature_id port_uint_id_table[] = {
+	{.id = PORT_FEATURE_ID_UINT,},
+	{0,}
+};
+
+static const struct dfl_feature_ops port_uint_ops = {
+	.ioctl = port_uint_ioctl,
+};
+
 static struct dfl_feature_driver port_feature_drvs[] = {
 	{
 		.id_table = port_hdr_id_table,
@@ -546,6 +570,10 @@ static struct dfl_feature_driver port_feature_drvs[] = {
 		.id_table = port_stp_id_table,
 		.ops = &port_stp_ops,
 	},
+	{
+		.id_table = port_uint_id_table,
+		.ops = &port_uint_ops,
+	},
 	{
 		.ops = NULL,
 	}
@@ -577,6 +605,7 @@ static int afu_release(struct inode *inode, struct file *filp)
 {
 	struct platform_device *pdev = filp->private_data;
 	struct dfl_feature_platform_data *pdata;
+	struct dfl_feature *feature;
 
 	dev_dbg(&pdev->dev, "Device File Release\n");
 
@@ -586,6 +615,9 @@ static int afu_release(struct inode *inode, struct file *filp)
 	dfl_feature_dev_use_end(pdata);
 
 	if (!dfl_feature_dev_use_count(pdata)) {
+		dfl_fpga_dev_for_each_feature(pdata, feature)
+			dfl_fpga_set_irq_triggers(feature, 0,
+						  feature->nr_irqs, NULL);
 		__port_reset(pdev);
 		afu_dma_region_destroy(pdata);
 	}

drivers/fpga/dfl-fme-error.c

@@ -15,6 +15,7 @@
  *   Mitchel, Henry <[email protected]>
  */
 
+#include <linux/fpga-dfl.h>
 #include <linux/uaccess.h>
 
 #include "dfl.h"
@@ -348,6 +349,22 @@ static void fme_global_err_uinit(struct platform_device *pdev,
 	fme_err_mask(&pdev->dev, true);
 }
 
+static long
+fme_global_error_ioctl(struct platform_device *pdev,
+		       struct dfl_feature *feature,
+		       unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case DFL_FPGA_FME_ERR_GET_IRQ_NUM:
+		return dfl_feature_ioctl_get_num_irqs(pdev, feature, arg);
+	case DFL_FPGA_FME_ERR_SET_IRQ:
+		return dfl_feature_ioctl_set_irq(pdev, feature, arg);
+	default:
+		dev_dbg(&pdev->dev, "%x cmd not handled", cmd);
+		return -ENODEV;
+	}
+}
+
 const struct dfl_feature_id fme_global_err_id_table[] = {
 	{.id = FME_FEATURE_ID_GLOBAL_ERR,},
 	{0,}
@@ -356,4 +373,5 @@ const struct dfl_feature_id fme_global_err_id_table[] = {
 const struct dfl_feature_ops fme_global_err_ops = {
 	.init = fme_global_err_init,
 	.uinit = fme_global_err_uinit,
+	.ioctl = fme_global_error_ioctl,
 };

drivers/fpga/dfl-fme-main.c

@@ -620,11 +620,17 @@ static int fme_release(struct inode *inode, struct file *filp)
 {
 	struct dfl_feature_platform_data *pdata = filp->private_data;
 	struct platform_device *pdev = pdata->dev;
+	struct dfl_feature *feature;
 
 	dev_dbg(&pdev->dev, "Device File Release\n");
 
 	mutex_lock(&pdata->lock);
 	dfl_feature_dev_use_end(pdata);
+
+	if (!dfl_feature_dev_use_count(pdata))
+		dfl_fpga_dev_for_each_feature(pdata, feature)
+			dfl_fpga_set_irq_triggers(feature, 0,
+						  feature->nr_irqs, NULL);
 	mutex_unlock(&pdata->lock);
 
 	return 0;