PCI: Add pci_irq_type() to query the allocated interrupt typegrafted

Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX
based on the interrupt type the PCI core selected after
pci_alloc_irq_vectors().

Several drivers already open-code this check against pdev->msix_enabled
and pdev->msi_enabled, or even open code this helper [1].

A common helper avoids the duplication and keeps drivers from accessing
the bitfield directly (see also [2]).

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1]
Inspired-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2]
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org
[ Add missing pci_irq_type() stub for CONFIG_PCI=n. ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 62 insertions, 0 deletions

diff --git a/Documentation/admin-guide/vga-softcursor.rst b/Documentation/admin-guide/vga-softcursor.rst
new file mode 100644
index 000000000..f52175457
--- /dev/null
+++ b/Documentation/admin-guide/vga-softcursor.rst
@@ -0,0 +1,62 @@
+Software cursor for VGA
+=======================
+
+by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>
+and Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+
+Linux now has some ability to manipulate cursor appearance.  Normally,
+you can set the size of hardware cursor.  You can now play a few new
+tricks: you can make your cursor look like a non-blinking red block,
+make it inverse background of the character it's over or to highlight
+that character and still choose whether the original hardware cursor
+should remain visible or not.  There may be other things I have never
+thought of.
+
+The cursor appearance is controlled by a ``<ESC>[?1;2;3c`` escape sequence
+where 1, 2 and 3 are parameters described below. If you omit any of them,
+they will default to zeroes.
+
+first Parameter
+	specifies cursor size::
+
+		0=default
+		1=invisible
+		2=underline,
+		...
+		8=full block
+		+ 16 if you want the software cursor to be applied
+		+ 32 if you want to always change the background color
+		+ 64 if you dislike having the background the same as the
+		     foreground.
+
+	Highlights are ignored for the last two flags.
+
+second parameter
+	selects character attribute bits you want to change
+	(by simply XORing them with the value of this parameter). On standard
+	VGA, the high four bits specify background and the low four the
+	foreground. In both groups, low three bits set color (as in normal
+	color codes used by the console) and the most significant one turns
+	on highlight (or sometimes blinking -- it depends on the configuration
+	of your VGA).
+
+third parameter
+	consists of character attribute bits you want to set.
+
+	Bit setting takes place before bit toggling, so you can simply clear a
+	bit by including it in both the set mask and the toggle mask.
+
+Examples
+--------
+
+To get normal blinking underline, use::
+
+	echo -e '\033[?2c'
+
+To get blinking block, use::
+
+	echo -e '\033[?6c'
+
+To get red non-blinking block, use::
+
+	echo -e '\033[?17;0;64c'