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Date: Tue, 4 Jun 2024 11:19:42 GMT
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To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org,
        dev-commits-src-branches@FreeBSD.org
From: Emmanuel Vadot <manu@FreeBSD.org>
Subject: git: 5080cf0846df - stable/14 - linuxkpi: Add linuxkpi_video
  module
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The branch stable/14 has been updated by manu:

URL: https://cgit.FreeBSD.org/src/commit/?id=5080cf0846dff22c25358bc2db15a147866578af

commit 5080cf0846dff22c25358bc2db15a147866578af
Author:     Emmanuel Vadot <manu@FreeBSD.org>
AuthorDate: 2024-04-24 08:14:36 +0000
Commit:     Emmanuel Vadot <manu@FreeBSD.org>
CommitDate: 2024-06-04 11:06:45 +0000

    linuxkpi: Add linuxkpi_video module
    
    This contain the hdmi code and the aperture code like in linux.
    
    Differential Revision:  https://reviews.freebsd.org/D44925
    Reviewed by:            bz
    Obtained from:          drm-kmod
    Sponsored by:           Beckhoff Automation GmbH & Co. KG
    
    (cherry picked from commit 11d79c4756b7c85faf7c4a268c301a41ce0887b9)
---
 .../linuxkpi/common/include/linux/aperture.h       |  58 ++++
 sys/compat/linuxkpi/common/src/linux_aperture.c    | 365 +++++++++++++++++++++
 .../linuxkpi/common/src/linuxkpi_videokmod.c       |   7 +
 sys/modules/Makefile                               |   1 +
 sys/modules/linuxkpi_video/Makefile                |  15 +
 5 files changed, 446 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/aperture.h b/sys/compat/linuxkpi/common/include/linux/aperture.h
new file mode 100644
index 000000000000..e0387ed0225d
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/aperture.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: MIT */
+
+#ifndef _LINUX_APERTURE_H_
+#define _LINUX_APERTURE_H_
+
+#include <linux/types.h>
+
+#define	CONFIG_APERTURE_HELPERS
+
+struct pci_dev;
+struct platform_device;
+
+#if defined(CONFIG_APERTURE_HELPERS)
+int devm_aperture_acquire_for_platform_device(struct platform_device *pdev,
+					      resource_size_t base,
+					      resource_size_t size);
+
+int aperture_remove_conflicting_devices(resource_size_t base, resource_size_t size,
+					bool primary, const char *name);
+
+int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *name);
+#else
+static inline int devm_aperture_acquire_for_platform_device(struct platform_device *pdev,
+							    resource_size_t base,
+							    resource_size_t size)
+{
+	return 0;
+}
+
+static inline int aperture_remove_conflicting_devices(resource_size_t base, resource_size_t size,
+						      bool primary, const char *name)
+{
+	return 0;
+}
+
+static inline int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *name)
+{
+	return 0;
+}
+#endif
+
+/**
+ * aperture_remove_all_conflicting_devices - remove all existing framebuffers
+ * @primary: also kick vga16fb if present; only relevant for VGA devices
+ * @name: a descriptive name of the requesting driver
+ *
+ * This function removes all graphics device drivers. Use this function on systems
+ * that can have their framebuffer located anywhere in memory.
+ *
+ * Returns:
+ * 0 on success, or a negative errno code otherwise
+ */
+static inline int aperture_remove_all_conflicting_devices(bool primary, const char *name)
+{
+	return aperture_remove_conflicting_devices(0, (resource_size_t)-1, primary, name);
+}
+
+#endif
diff --git a/sys/compat/linuxkpi/common/src/linux_aperture.c b/sys/compat/linuxkpi/common/src/linux_aperture.c
new file mode 100644
index 000000000000..15a56839fa9c
--- /dev/null
+++ b/sys/compat/linuxkpi/common/src/linux_aperture.c
@@ -0,0 +1,365 @@
+// SPDX-License-Identifier: MIT
+
+#include <linux/aperture.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/sysfb.h>
+#include <linux/types.h>
+#include <linux/vgaarb.h>
+
+#include <video/vga.h>
+
+/**
+ * DOC: overview
+ *
+ * A graphics device might be supported by different drivers, but only one
+ * driver can be active at any given time. Many systems load a generic
+ * graphics drivers, such as EFI-GOP or VESA, early during the boot process.
+ * During later boot stages, they replace the generic driver with a dedicated,
+ * hardware-specific driver. To take over the device the dedicated driver
+ * first has to remove the generic driver. Aperture functions manage
+ * ownership of framebuffer memory and hand-over between drivers.
+ *
+ * Graphics drivers should call aperture_remove_conflicting_devices()
+ * at the top of their probe function. The function removes any generic
+ * driver that is currently associated with the given framebuffer memory.
+ * An example for a graphics device on the platform bus is shown below.
+ *
+ * .. code-block:: c
+ *
+ *	static int example_probe(struct platform_device *pdev)
+ *	{
+ *		struct resource *mem;
+ *		resource_size_t base, size;
+ *		int ret;
+ *
+ *		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ *		if (!mem)
+ *			return -ENODEV;
+ *		base = mem->start;
+ *		size = resource_size(mem);
+ *
+ *		ret = aperture_remove_conflicting_devices(base, size, false, "example");
+ *		if (ret)
+ *			return ret;
+ *
+ *		// Initialize the hardware
+ *		...
+ *
+ *		return 0;
+ *	}
+ *
+ *	static const struct platform_driver example_driver = {
+ *		.probe = example_probe,
+ *		...
+ *	};
+ *
+ * The given example reads the platform device's I/O-memory range from the
+ * device instance. An active framebuffer will be located within this range.
+ * The call to aperture_remove_conflicting_devices() releases drivers that
+ * have previously claimed ownership of the range and are currently driving
+ * output on the framebuffer. If successful, the new driver can take over
+ * the device.
+ *
+ * While the given example uses a platform device, the aperture helpers work
+ * with every bus that has an addressable framebuffer. In the case of PCI,
+ * device drivers can also call aperture_remove_conflicting_pci_devices() and
+ * let the function detect the apertures automatically. Device drivers without
+ * knowledge of the framebuffer's location can call
+ * aperture_remove_all_conflicting_devices(), which removes all known devices.
+ *
+ * Drivers that are susceptible to being removed by other drivers, such as
+ * generic EFI or VESA drivers, have to register themselves as owners of their
+ * framebuffer apertures. Ownership of the framebuffer memory is achieved
+ * by calling devm_aperture_acquire_for_platform_device(). If successful, the
+ * driveris the owner of the framebuffer range. The function fails if the
+ * framebuffer is already owned by another driver. See below for an example.
+ *
+ * .. code-block:: c
+ *
+ *	static int generic_probe(struct platform_device *pdev)
+ *	{
+ *		struct resource *mem;
+ *		resource_size_t base, size;
+ *
+ *		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ *		if (!mem)
+ *			return -ENODEV;
+ *		base = mem->start;
+ *		size = resource_size(mem);
+ *
+ *		ret = devm_aperture_acquire_for_platform_device(pdev, base, size);
+ *		if (ret)
+ *			return ret;
+ *
+ *		// Initialize the hardware
+ *		...
+ *
+ *		return 0;
+ *	}
+ *
+ *	static int generic_remove(struct platform_device *)
+ *	{
+ *		// Hot-unplug the device
+ *		...
+ *
+ *		return 0;
+ *	}
+ *
+ *	static const struct platform_driver generic_driver = {
+ *		.probe = generic_probe,
+ *		.remove = generic_remove,
+ *		...
+ *	};
+ *
+ * The similar to the previous example, the generic driver claims ownership
+ * of the framebuffer memory from its probe function. This will fail if the
+ * memory range, or parts of it, is already owned by another driver.
+ *
+ * If successful, the generic driver is now subject to forced removal by
+ * another driver. This only works for platform drivers that support hot
+ * unplugging. When a driver calls aperture_remove_conflicting_devices()
+ * et al for the registered framebuffer range, the aperture helpers call
+ * platform_device_unregister() and the generic driver unloads itself. The
+ * generic driver also has to provide a remove function to make this work.
+ * Once hot unplugged fro mhardware, it may not access the device's
+ * registers, framebuffer memory, ROM, etc afterwards.
+ */
+
+struct aperture_range {
+	struct device *dev;
+	resource_size_t base;
+	resource_size_t size;
+	struct list_head lh;
+	void (*detach)(struct device *dev);
+};
+
+static LIST_HEAD(apertures);
+static DEFINE_MUTEX(apertures_lock);
+
+static bool overlap(resource_size_t base1, resource_size_t end1,
+		    resource_size_t base2, resource_size_t end2)
+{
+	return (base1 < end2) && (end1 > base2);
+}
+
+static void devm_aperture_acquire_release(void *data)
+{
+	struct aperture_range *ap = data;
+	bool detached = !ap->dev;
+
+	if (detached)
+		return;
+
+	mutex_lock(&apertures_lock);
+	list_del(&ap->lh);
+	mutex_unlock(&apertures_lock);
+}
+
+static int devm_aperture_acquire(struct device *dev,
+				 resource_size_t base, resource_size_t size,
+				 void (*detach)(struct device *))
+{
+	size_t end = base + size;
+	struct list_head *pos;
+	struct aperture_range *ap;
+
+	mutex_lock(&apertures_lock);
+
+	list_for_each(pos, &apertures) {
+		ap = container_of(pos, struct aperture_range, lh);
+		if (overlap(base, end, ap->base, ap->base + ap->size)) {
+			mutex_unlock(&apertures_lock);
+			return -EBUSY;
+		}
+	}
+
+	ap = devm_kzalloc(dev, sizeof(*ap), GFP_KERNEL);
+	if (!ap) {
+		mutex_unlock(&apertures_lock);
+		return -ENOMEM;
+	}
+
+	ap->dev = dev;
+	ap->base = base;
+	ap->size = size;
+	ap->detach = detach;
+	INIT_LIST_HEAD(&ap->lh);
+
+	list_add(&ap->lh, &apertures);
+
+	mutex_unlock(&apertures_lock);
+
+	return devm_add_action_or_reset(dev, devm_aperture_acquire_release, ap);
+}
+
+static void aperture_detach_platform_device(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	/*
+	 * Remove the device from the device hierarchy. This is the right thing
+	 * to do for firmware-based DRM drivers, such as EFI, VESA or VGA. After
+	 * the new driver takes over the hardware, the firmware device's state
+	 * will be lost.
+	 *
+	 * For non-platform devices, a new callback would be required.
+	 *
+	 * If the aperture helpers ever need to handle native drivers, this call
+	 * would only have to unplug the DRM device, so that the hardware device
+	 * stays around after detachment.
+	 */
+	platform_device_unregister(pdev);
+}
+
+/**
+ * devm_aperture_acquire_for_platform_device - Acquires ownership of an aperture
+ *                                             on behalf of a platform device.
+ * @pdev:	the platform device to own the aperture
+ * @base:	the aperture's byte offset in physical memory
+ * @size:	the aperture size in bytes
+ *
+ * Installs the given device as the new owner of the aperture. The function
+ * expects the aperture to be provided by a platform device. If another
+ * driver takes over ownership of the aperture, aperture helpers will then
+ * unregister the platform device automatically. All acquired apertures are
+ * released automatically when the underlying device goes away.
+ *
+ * The function fails if the aperture, or parts of it, is currently
+ * owned by another device. To evict current owners, callers should use
+ * remove_conflicting_devices() et al. before calling this function.
+ *
+ * Returns:
+ * 0 on success, or a negative errno value otherwise.
+ */
+int devm_aperture_acquire_for_platform_device(struct platform_device *pdev,
+					      resource_size_t base,
+					      resource_size_t size)
+{
+	return devm_aperture_acquire(&pdev->dev, base, size, aperture_detach_platform_device);
+}
+EXPORT_SYMBOL(devm_aperture_acquire_for_platform_device);
+
+static void aperture_detach_devices(resource_size_t base, resource_size_t size)
+{
+	resource_size_t end = base + size;
+	struct list_head *pos, *n;
+
+	mutex_lock(&apertures_lock);
+
+	list_for_each_safe(pos, n, &apertures) {
+		struct aperture_range *ap = container_of(pos, struct aperture_range, lh);
+		struct device *dev = ap->dev;
+
+		if (WARN_ON_ONCE(!dev))
+			continue;
+
+		if (!overlap(base, end, ap->base, ap->base + ap->size))
+			continue;
+
+		ap->dev = NULL; /* detach from device */
+		list_del(&ap->lh);
+
+		ap->detach(dev);
+	}
+
+	mutex_unlock(&apertures_lock);
+}
+
+/**
+ * aperture_remove_conflicting_devices - remove devices in the given range
+ * @base: the aperture's base address in physical memory
+ * @size: aperture size in bytes
+ * @primary: also kick vga16fb if present; only relevant for VGA devices
+ * @name: a descriptive name of the requesting driver
+ *
+ * This function removes devices that own apertures within @base and @size.
+ *
+ * Returns:
+ * 0 on success, or a negative errno code otherwise
+ */
+int aperture_remove_conflicting_devices(resource_size_t base, resource_size_t size,
+					bool primary, const char *name)
+{
+	/*
+	 * If a driver asked to unregister a platform device registered by
+	 * sysfb, then can be assumed that this is a driver for a display
+	 * that is set up by the system firmware and has a generic driver.
+	 *
+	 * Drivers for devices that don't have a generic driver will never
+	 * ask for this, so let's assume that a real driver for the display
+	 * was already probed and prevent sysfb to register devices later.
+	 */
+#ifdef __linux__
+	sysfb_disable();
+#endif
+
+	aperture_detach_devices(base, size);
+
+	/*
+	 * If this is the primary adapter, there could be a VGA device
+	 * that consumes the VGA framebuffer I/O range. Remove this device
+	 * as well.
+	 */
+	if (primary)
+		aperture_detach_devices(VGA_FB_PHYS_BASE, VGA_FB_PHYS_SIZE);
+
+	return 0;
+}
+EXPORT_SYMBOL(aperture_remove_conflicting_devices);
+
+/**
+ * aperture_remove_conflicting_pci_devices - remove existing framebuffers for PCI devices
+ * @pdev: PCI device
+ * @name: a descriptive name of the requesting driver
+ *
+ * This function removes devices that own apertures within any of @pdev's
+ * memory bars. The function assumes that PCI device with shadowed ROM
+ * drives a primary display and therefore kicks out vga16fb as well.
+ *
+ * Returns:
+ * 0 on success, or a negative errno code otherwise
+ */
+int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *name)
+{
+	bool primary = false;
+	resource_size_t base, size;
+	int bar, ret;
+
+#ifdef CONFIG_X86
+#ifdef __linux__
+	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
+#elif defined(__FreeBSD__)
+	primary = NULL;
+#endif
+#endif
+
+	for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) {
+		if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
+			continue;
+
+		base = pci_resource_start(pdev, bar);
+		size = pci_resource_len(pdev, bar);
+		ret = aperture_remove_conflicting_devices(base, size, primary, name);
+		if (ret)
+			return ret;
+	}
+
+	/*
+	 * WARNING: Apparently we must kick fbdev drivers before vgacon,
+	 * otherwise the vga fbdev driver falls over.
+	 */
+#ifdef __linux__
+	ret = vga_remove_vgacon(pdev);
+	if (ret)
+		return ret;
+#endif
+
+	return 0;
+
+}
+EXPORT_SYMBOL(aperture_remove_conflicting_pci_devices);
diff --git a/sys/compat/linuxkpi/common/src/linuxkpi_videokmod.c b/sys/compat/linuxkpi/common/src/linuxkpi_videokmod.c
new file mode 100644
index 000000000000..8881adc0d657
--- /dev/null
+++ b/sys/compat/linuxkpi/common/src/linuxkpi_videokmod.c
@@ -0,0 +1,7 @@
+/* Public domain. */
+
+#include <sys/param.h>
+#include <sys/module.h>
+
+MODULE_VERSION(linuxkpi_video, 1);
+MODULE_DEPEND(linuxkpi_video, linuxkpi, 1, 1, 1);
diff --git a/sys/modules/Makefile b/sys/modules/Makefile
index 24e2bbabe481..9a92b6f3de7d 100644
--- a/sys/modules/Makefile
+++ b/sys/modules/Makefile
@@ -216,6 +216,7 @@ SUBDIR=	\
 	lindebugfs \
 	linuxkpi \
 	linuxkpi_hdmi \
+	linuxkpi_video \
 	linuxkpi_wlan \
 	${_lio} \
 	lpt \
diff --git a/sys/modules/linuxkpi_video/Makefile b/sys/modules/linuxkpi_video/Makefile
new file mode 100644
index 000000000000..a9562eaf4735
--- /dev/null
+++ b/sys/modules/linuxkpi_video/Makefile
@@ -0,0 +1,15 @@
+.PATH:	${SRCTOP}/sys/compat/linuxkpi/common/src
+
+KMOD=	linuxkpi_video
+SRCS=	linux_hdmi.c \
+	linux_aperture.c \
+	linuxkpi_videokmod.c
+
+SRCS+=	${LINUXKPI_GENSRCS}
+
+CFLAGS+=		${LINUXKPI_INCLUDES}
+CFLAGS.linux_hdmi.c=	-Wno-cast-qual
+
+EXPORT_SYMS=	YES
+
+.include <bsd.kmod.mk>