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Message-Id: <20241007-b4-has_ioport-v6-3-03f7240da6e5@linux.ibm.com>
Date: Mon, 07 Oct 2024 13:40:21 +0200
From: Niklas Schnelle <schnelle@...ux.ibm.com>
To: Brian Cain <bcain@...cinc.com>, Marcel Holtmann <marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Dave Airlie <airlied@...hat.com>, Gerd Hoffmann <kraxel@...hat.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        "Maciej W. Rozycki" <macro@...am.me.uk>,
        Heiko Carstens <hca@...ux.ibm.com>
Cc: linux-kernel@...r.kernel.org, linux-hexagon@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux.dev, spice-devel@...ts.freedesktop.org,
        intel-xe@...ts.freedesktop.org, linux-serial@...r.kernel.org,
        linux-arch@...r.kernel.org, Niklas Schnelle <schnelle@...ux.ibm.com>,
        Arnd Bergmann <arnd@...nel.org>
Subject: [PATCH v6 3/5] drm: handle HAS_IOPORT dependencies

In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
compile time. We thus need to add HAS_IOPORT as dependency for those
drivers using them. In the bochs driver there is optional MMIO support
detected at runtime, warn if this isn't taken when HAS_IOPORT is not
defined.

There is also a direct and hard coded use in cirrus.c which according to
the comment is only necessary during resume.  Let's just skip this as
for example s390 which doesn't have I/O port support also doesen't
support suspend/resume.

Co-developed-by: Arnd Bergmann <arnd@...nel.org>
Signed-off-by: Arnd Bergmann <arnd@...nel.org>
Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
 drivers/gpu/drm/gma500/Kconfig |  2 +-
 drivers/gpu/drm/qxl/Kconfig    |  1 +
 drivers/gpu/drm/tiny/bochs.c   | 17 +++++++++++++++++
 drivers/gpu/drm/tiny/cirrus.c  |  2 ++
 drivers/gpu/drm/xe/Kconfig     |  2 +-
 5 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/gma500/Kconfig b/drivers/gpu/drm/gma500/Kconfig
index efb4a2dd2f80885cb59c925d09401002278d7d61..23b7c14de5e29238ece939d5822d8a9ffc4675cc 100644
--- a/drivers/gpu/drm/gma500/Kconfig
+++ b/drivers/gpu/drm/gma500/Kconfig
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config DRM_GMA500
 	tristate "Intel GMA500/600/3600/3650 KMS Framebuffer"
-	depends on DRM && PCI && X86 && MMU
+	depends on DRM && PCI && X86 && MMU && HAS_IOPORT
 	select DRM_KMS_HELPER
 	select FB_IOMEM_HELPERS if DRM_FBDEV_EMULATION
 	select I2C
diff --git a/drivers/gpu/drm/qxl/Kconfig b/drivers/gpu/drm/qxl/Kconfig
index ca3f51c2a8fe1a383f8a2479f04b5c0b3fb14e44..d0e0d440c8d96564cb7b8ffd2385c44fc43f873d 100644
--- a/drivers/gpu/drm/qxl/Kconfig
+++ b/drivers/gpu/drm/qxl/Kconfig
@@ -2,6 +2,7 @@
 config DRM_QXL
 	tristate "QXL virtual GPU"
 	depends on DRM && PCI && MMU
+	depends on HAS_IOPORT
 	select DRM_KMS_HELPER
 	select DRM_TTM
 	select DRM_TTM_HELPER
diff --git a/drivers/gpu/drm/tiny/bochs.c b/drivers/gpu/drm/tiny/bochs.c
index 31fc5d839e106ea4d5c8fe42d1bfc3c70291e3fb..0ed78d3d5774778f91de972ac27056938036e722 100644
--- a/drivers/gpu/drm/tiny/bochs.c
+++ b/drivers/gpu/drm/tiny/bochs.c
@@ -2,6 +2,7 @@
 
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/bug.h>
 
 #include <drm/drm_aperture.h>
 #include <drm/drm_atomic_helper.h>
@@ -105,7 +106,9 @@ static void bochs_vga_writeb(struct bochs_device *bochs, u16 ioport, u8 val)
 
 		writeb(val, bochs->mmio + offset);
 	} else {
+#ifdef CONFIG_HAS_IOPORT
 		outb(val, ioport);
+#endif
 	}
 }
 
@@ -119,7 +122,11 @@ static u8 bochs_vga_readb(struct bochs_device *bochs, u16 ioport)
 
 		return readb(bochs->mmio + offset);
 	} else {
+#ifdef CONFIG_HAS_IOPORT
 		return inb(ioport);
+#else
+		return 0xff;
+#endif
 	}
 }
 
@@ -132,8 +139,12 @@ static u16 bochs_dispi_read(struct bochs_device *bochs, u16 reg)
 
 		ret = readw(bochs->mmio + offset);
 	} else {
+#ifdef CONFIG_HAS_IOPORT
 		outw(reg, VBE_DISPI_IOPORT_INDEX);
 		ret = inw(VBE_DISPI_IOPORT_DATA);
+#else
+		ret = 0xffff;
+#endif
 	}
 	return ret;
 }
@@ -145,8 +156,10 @@ static void bochs_dispi_write(struct bochs_device *bochs, u16 reg, u16 val)
 
 		writew(val, bochs->mmio + offset);
 	} else {
+#ifdef CONFIG_HAS_IOPORT
 		outw(reg, VBE_DISPI_IOPORT_INDEX);
 		outw(val, VBE_DISPI_IOPORT_DATA);
+#endif
 	}
 }
 
@@ -229,6 +242,10 @@ static int bochs_hw_init(struct drm_device *dev)
 			return -ENOMEM;
 		}
 	} else {
+		if (!IS_ENABLED(CONFIG_HAS_IOPORT)) {
+			DRM_ERROR("I/O ports are not supported\n");
+			return -EIO;
+		}
 		ioaddr = VBE_DISPI_IOPORT_INDEX;
 		iosize = 2;
 		if (!request_region(ioaddr, iosize, "bochs-drm")) {
diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c
index 751326e3d9c374baf72115492aeefff2b73869f0..e31e1df029ab0272c4a1ff0ab3eb026ca679b560 100644
--- a/drivers/gpu/drm/tiny/cirrus.c
+++ b/drivers/gpu/drm/tiny/cirrus.c
@@ -509,8 +509,10 @@ static void cirrus_crtc_helper_atomic_enable(struct drm_crtc *crtc,
 
 	cirrus_mode_set(cirrus, &crtc_state->mode);
 
+#ifdef CONFIG_HAS_IOPORT
 	/* Unblank (needed on S3 resume, vgabios doesn't do it then) */
 	outb(VGA_AR_ENABLE_DISPLAY, VGA_ATT_W);
+#endif
 
 	drm_dev_exit(idx);
 }
diff --git a/drivers/gpu/drm/xe/Kconfig b/drivers/gpu/drm/xe/Kconfig
index 7bbe46a98ff1f449bc2af30686585a00e9e8af93..116f58774135fc3a9f37d6d72d41340f5c812297 100644
--- a/drivers/gpu/drm/xe/Kconfig
+++ b/drivers/gpu/drm/xe/Kconfig
@@ -49,7 +49,7 @@ config DRM_XE
 
 config DRM_XE_DISPLAY
 	bool "Enable display support"
-	depends on DRM_XE && DRM_XE=m
+	depends on DRM_XE && DRM_XE=m && HAS_IOPORT
 	select FB_IOMEM_HELPERS
 	select I2C
 	select I2C_ALGOBIT

-- 
2.43.0


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