Merge: RHEL 9.8: DRM Dependencies Backport (6.17)

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/7327

## Overview

The DRM backport's goal is to backport all the changes in the DRM subsystem to the kernel target version, with the biggest value being that we get the upstream hardware enablement (and bug fixes) into RHEL.

This merge request is the initial step of the DRM backport: identify and backport the dependencies of the DRM backport outside of `drivers/gpu`.

Check https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/7329 for the main backport MR.

## Other

JIRA: https://issues.redhat.com/browse/RHEL-113576
Signed-off-by: José Expósito <jexposit@redhat.com>

Approved-by: Anusha Srivatsa <asrivats@redhat.com>
Approved-by: Jocelyn Falempe <jfalempe@redhat.com>
Approved-by: Audra Mitchell <aubaker@redhat.com>
Approved-by: Rafael Aquini <raquini@redhat.com>
Approved-by: Steve Best <sbest@redhat.com>
Approved-by: Eder Zulian <ezulian@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: CKI GitLab Kmaint Pipeline Bot <26919896-cki-kmaint-pipeline-bot@users.noreply.gitlab.com>

Author: CKI KWF Bot

drivers/base/power/main.c

@@ -66,6 +66,20 @@ static pm_message_t pm_transition;
 
 static int async_error;
 
+/**
+ * pm_hibernate_is_recovering - if recovering from hibernate due to error.
+ *
+ * Used to query if dev_pm_ops.thaw() is called for normal hibernation case or
+ * recovering from some error.
+ *
+ * Return: true for error case, false for normal case.
+ */
+bool pm_hibernate_is_recovering(void)
+{
+	return pm_transition.event == PM_EVENT_RECOVER;
+}
+EXPORT_SYMBOL_GPL(pm_hibernate_is_recovering);
+
 static const char *pm_verb(int event)
 {
 	switch (event) {

drivers/firmware/sysfb_simplefb.c

@@ -35,36 +35,7 @@ __init bool sysfb_parse_mode(const struct screen_info *si,
 	if (type != VIDEO_TYPE_VLFB && type != VIDEO_TYPE_EFI)
 		return false;
 
-	/*
-	 * The meaning of depth and bpp for direct-color formats is
-	 * inconsistent:
-	 *
-	 *  - DRM format info specifies depth as the number of color
-	 *    bits; including alpha, but not including filler bits.
-	 *  - Linux' EFI platform code computes lfb_depth from the
-	 *    individual color channels, including the reserved bits.
-	 *  - VBE 1.1 defines lfb_depth for XRGB1555 as 16, but later
-	 *    versions use 15.
-	 *  - On the kernel command line, 'bpp' of 32 is usually
-	 *    XRGB8888 including the filler bits, but 15 is XRGB1555
-	 *    not including the filler bit.
-	 *
-	 * It's not easily possible to fix this in struct screen_info,
-	 * as this could break UAPI. The best solution is to compute
-	 * bits_per_pixel from the color bits, reserved bits and
-	 * reported lfb_depth, whichever is highest.  In the loop below,
-	 * ignore simplefb formats with alpha bits, as EFI and VESA
-	 * don't specify alpha channels.
-	 */
-	if (si->lfb_depth > 8) {
-		bits_per_pixel = max(max3(si->red_size + si->red_pos,
-					  si->green_size + si->green_pos,
-					  si->blue_size + si->blue_pos),
-				     si->rsvd_size + si->rsvd_pos);
-		bits_per_pixel = max_t(u32, bits_per_pixel, si->lfb_depth);
-	} else {
-		bits_per_pixel = si->lfb_depth;
-	}
+	bits_per_pixel = __screen_info_lfb_bits_per_pixel(si);
 
 	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
 		const struct simplefb_format *f = &formats[i];

drivers/gpu/drm/i915/gem/i915_gemfs.c

@@ -6,16 +6,23 @@
 
 #include <linux/fs.h>
 #include <linux/mount.h>
+#include <linux/fs_context.h>
 
 #include "i915_drv.h"
 #include "i915_gemfs.h"
 #include "i915_utils.h"
 
+static int add_param(struct fs_context *fc, const char *key, const char *val)
+{
+	return vfs_parse_fs_string(fc, key, val, strlen(val));
+}
+
 void i915_gemfs_init(struct drm_i915_private *i915)
 {
-	char huge_opt[] = "huge=within_size"; /* r/w */
 	struct file_system_type *type;
+	struct fs_context *fc;
 	struct vfsmount *gemfs;
+	int ret;
 
 	/*
 	 * By creating our own shmemfs mountpoint, we can pass in
@@ -39,8 +46,16 @@ void i915_gemfs_init(struct drm_i915_private *i915)
 	if (!type)
 		goto err;
 
-	gemfs = vfs_kern_mount(type, SB_KERNMOUNT, type->name, huge_opt);
-	if (IS_ERR(gemfs))
+	fc = fs_context_for_mount(type, SB_KERNMOUNT);
+	if (IS_ERR(fc))
+		goto err;
+	ret = add_param(fc, "source", "tmpfs");
+	if (!ret)
+		ret = add_param(fc, "huge", "within_size");
+	if (!ret)
+		gemfs = fc_mount_longterm(fc);
+	put_fs_context(fc);
+	if (ret)
 		goto err;
 
 	i915->mm.gemfs = gemfs;

drivers/platform/x86/apple-gmux.c

@@ -65,29 +65,6 @@ struct apple_gmux_data {
 
 static struct apple_gmux_data *apple_gmux_data;
 
-/*
- * gmux port offsets. Many of these are not yet used, but may be in the
- * future, and it's useful to have them documented here anyhow.
- */
-#define GMUX_PORT_VERSION_MAJOR		0x04
-#define GMUX_PORT_VERSION_MINOR		0x05
-#define GMUX_PORT_VERSION_RELEASE	0x06
-#define GMUX_PORT_SWITCH_DISPLAY	0x10
-#define GMUX_PORT_SWITCH_GET_DISPLAY	0x11
-#define GMUX_PORT_INTERRUPT_ENABLE	0x14
-#define GMUX_PORT_INTERRUPT_STATUS	0x16
-#define GMUX_PORT_SWITCH_DDC		0x28
-#define GMUX_PORT_SWITCH_EXTERNAL	0x40
-#define GMUX_PORT_SWITCH_GET_EXTERNAL	0x41
-#define GMUX_PORT_DISCRETE_POWER	0x50
-#define GMUX_PORT_MAX_BRIGHTNESS	0x70
-#define GMUX_PORT_BRIGHTNESS		0x74
-#define GMUX_PORT_VALUE			0xc2
-#define GMUX_PORT_READ			0xd0
-#define GMUX_PORT_WRITE			0xd4
-
-#define GMUX_MIN_IO_LEN			(GMUX_PORT_BRIGHTNESS + 4)
-
 #define GMUX_INTERRUPT_ENABLE		0xff
 #define GMUX_INTERRUPT_DISABLE		0x00
 
@@ -250,23 +227,6 @@ static void gmux_write32(struct apple_gmux_data *gmux_data, int port,
 		gmux_pio_write32(gmux_data, port, val);
 }
 
-static bool gmux_is_indexed(struct apple_gmux_data *gmux_data)
-{
-	u16 val;
-
-	outb(0xaa, gmux_data->iostart + 0xcc);
-	outb(0x55, gmux_data->iostart + 0xcd);
-	outb(0x00, gmux_data->iostart + 0xce);
-
-	val = inb(gmux_data->iostart + 0xcc) |
-		(inb(gmux_data->iostart + 0xcd) << 8);
-
-	if (val == 0x55aa)
-		return true;
-
-	return false;
-}
-
 /**
  * DOC: Backlight control
  *
@@ -609,60 +569,43 @@ static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
 	int ret = -ENXIO;
 	acpi_status status;
 	unsigned long long gpe;
+	bool indexed = false;
+	u32 version;
 
 	if (apple_gmux_data)
 		return -EBUSY;
 
+	if (!apple_gmux_detect(pnp, &indexed)) {
+		pr_info("gmux device not present\n");
+		return -ENODEV;
+	}
+
 	gmux_data = kzalloc(sizeof(*gmux_data), GFP_KERNEL);
 	if (!gmux_data)
 		return -ENOMEM;
 	pnp_set_drvdata(pnp, gmux_data);
 
 	res = pnp_get_resource(pnp, IORESOURCE_IO, 0);
-	if (!res) {
-		pr_err("Failed to find gmux I/O resource\n");
-		goto err_free;
-	}
-
 	gmux_data->iostart = res->start;
 	gmux_data->iolen = res->end - res->start;
 
-	if (gmux_data->iolen < GMUX_MIN_IO_LEN) {
-		pr_err("gmux I/O region too small (%lu < %u)\n",
-		       gmux_data->iolen, GMUX_MIN_IO_LEN);
-		goto err_free;
-	}
-
 	if (!request_region(gmux_data->iostart, gmux_data->iolen,
 			    "Apple gmux")) {
 		pr_err("gmux I/O already in use\n");
 		goto err_free;
 	}
 
-	/*
-	 * Invalid version information may indicate either that the gmux
-	 * device isn't present or that it's a new one that uses indexed
-	 * io
-	 */
-
-	ver_major = gmux_read8(gmux_data, GMUX_PORT_VERSION_MAJOR);
-	ver_minor = gmux_read8(gmux_data, GMUX_PORT_VERSION_MINOR);
-	ver_release = gmux_read8(gmux_data, GMUX_PORT_VERSION_RELEASE);
-	if (ver_major == 0xff && ver_minor == 0xff && ver_release == 0xff) {
-		if (gmux_is_indexed(gmux_data)) {
-			u32 version;
-			mutex_init(&gmux_data->index_lock);
-			gmux_data->indexed = true;
-			version = gmux_read32(gmux_data,
-				GMUX_PORT_VERSION_MAJOR);
-			ver_major = (version >> 24) & 0xff;
-			ver_minor = (version >> 16) & 0xff;
-			ver_release = (version >> 8) & 0xff;
-		} else {
-			pr_info("gmux device not present\n");
-			ret = -ENODEV;
-			goto err_release;
-		}
+	if (indexed) {
+		mutex_init(&gmux_data->index_lock);
+		gmux_data->indexed = true;
+		version = gmux_read32(gmux_data, GMUX_PORT_VERSION_MAJOR);
+		ver_major = (version >> 24) & 0xff;
+		ver_minor = (version >> 16) & 0xff;
+		ver_release = (version >> 8) & 0xff;
+	} else {
+		ver_major = gmux_read8(gmux_data, GMUX_PORT_VERSION_MAJOR);
+		ver_minor = gmux_read8(gmux_data, GMUX_PORT_VERSION_MINOR);
+		ver_release = gmux_read8(gmux_data, GMUX_PORT_VERSION_RELEASE);
 	}
 	pr_info("Found gmux version %d.%d.%d [%s]\n", ver_major, ver_minor,
 		ver_release, (gmux_data->indexed ? "indexed" : "classic"));

drivers/video/screen_info_generic.c

@@ -144,3 +144,39 @@ ssize_t screen_info_resources(const struct screen_info *si, struct resource *r,
 	return pos - r;
 }
 EXPORT_SYMBOL(screen_info_resources);
+
+/*
+ * The meaning of depth and bpp for direct-color formats is
+ * inconsistent:
+ *
+ *  - DRM format info specifies depth as the number of color
+ *    bits; including alpha, but not including filler bits.
+ *  - Linux' EFI platform code computes lfb_depth from the
+ *    individual color channels, including the reserved bits.
+ *  - VBE 1.1 defines lfb_depth for XRGB1555 as 16, but later
+ *    versions use 15.
+ *  - On the kernel command line, 'bpp' of 32 is usually
+ *    XRGB8888 including the filler bits, but 15 is XRGB1555
+ *    not including the filler bit.
+ *
+ * It is not easily possible to fix this in struct screen_info,
+ * as this could break UAPI. The best solution is to compute
+ * bits_per_pixel from the color bits, reserved bits and
+ * reported lfb_depth, whichever is highest.
+ */
+
+u32 __screen_info_lfb_bits_per_pixel(const struct screen_info *si)
+{
+	u32 bits_per_pixel = si->lfb_depth;
+
+	if (bits_per_pixel > 8) {
+		bits_per_pixel = max(max3(si->red_size + si->red_pos,
+					  si->green_size + si->green_pos,
+					  si->blue_size + si->blue_pos),
+				     si->rsvd_size + si->rsvd_pos);
+		bits_per_pixel = max_t(u32, bits_per_pixel, si->lfb_depth);
+	}
+
+	return bits_per_pixel;
+}
+EXPORT_SYMBOL(__screen_info_lfb_bits_per_pixel);

fs/hugetlbfs/inode.c

@@ -1647,7 +1647,7 @@ static struct vfsmount *__init mount_one_hugetlbfs(struct hstate *h)
 	} else {
 		struct hugetlbfs_fs_context *ctx = fc->fs_private;
 		ctx->hstate = h;
-		mnt = fc_mount(fc);
+		mnt = fc_mount_longterm(fc);
 		put_fs_context(fc);
 	}
 	if (IS_ERR(mnt))

fs/namespace.c

@@ -998,6 +998,15 @@ struct vfsmount *fc_mount(struct fs_context *fc)
 }
 EXPORT_SYMBOL(fc_mount);
 
+struct vfsmount *fc_mount_longterm(struct fs_context *fc)
+{
+	struct vfsmount *mnt = fc_mount(fc);
+	if (!IS_ERR(mnt))
+		real_mount(mnt)->mnt_ns = MNT_NS_INTERNAL;
+	return mnt;
+}
+EXPORT_SYMBOL(fc_mount_longterm);
+
 struct vfsmount *vfs_kern_mount(struct file_system_type *type,
 				int flags, const char *name,
 				void *data)