From f663c6ae36205bdaae55f679f1c5d7a3221f9d00 Mon Sep 17 00:00:00 2001 From: Niklas Schnelle Date: Thu, 24 Oct 2024 19:54:42 +0200 Subject: [PATCH] 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 Signed-off-by: Arnd Bergmann Acked-by: Lucas De Marchi # xe Signed-off-by: Niklas Schnelle Signed-off-by: Arnd Bergmann --- drivers/gpu/drm/gma500/Kconfig | 2 +- drivers/gpu/drm/qxl/Kconfig | 2 +- drivers/gpu/drm/tiny/bochs.c | 19 ++++++++++++++----- drivers/gpu/drm/tiny/cirrus.c | 2 ++ drivers/gpu/drm/xe/Kconfig | 2 +- 5 files changed, 19 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/gma500/Kconfig b/drivers/gpu/drm/gma500/Kconfig index efb4a2dd2f80..23b7c14de5e2 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 ca3f51c2a8fe..17d6927e5e23 100644 --- a/drivers/gpu/drm/qxl/Kconfig +++ b/drivers/gpu/drm/qxl/Kconfig @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only config DRM_QXL tristate "QXL virtual GPU" - depends on DRM && PCI && MMU + depends on DRM && PCI && MMU && 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 31fc5d839e10..e738bb858316 100644 --- a/drivers/gpu/drm/tiny/bochs.c +++ b/drivers/gpu/drm/tiny/bochs.c @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0-or-later +#include #include #include @@ -95,12 +96,17 @@ struct bochs_device { /* ---------------------------------------------------------------------- */ +static __always_inline bool bochs_uses_mmio(struct bochs_device *bochs) +{ + return !IS_ENABLED(CONFIG_HAS_IOPORT) || bochs->mmio; +} + static void bochs_vga_writeb(struct bochs_device *bochs, u16 ioport, u8 val) { if (WARN_ON(ioport < 0x3c0 || ioport > 0x3df)) return; - if (bochs->mmio) { + if (bochs_uses_mmio(bochs)) { int offset = ioport - 0x3c0 + 0x400; writeb(val, bochs->mmio + offset); @@ -114,7 +120,7 @@ static u8 bochs_vga_readb(struct bochs_device *bochs, u16 ioport) if (WARN_ON(ioport < 0x3c0 || ioport > 0x3df)) return 0xff; - if (bochs->mmio) { + if (bochs_uses_mmio(bochs)) { int offset = ioport - 0x3c0 + 0x400; return readb(bochs->mmio + offset); @@ -127,7 +133,7 @@ static u16 bochs_dispi_read(struct bochs_device *bochs, u16 reg) { u16 ret = 0; - if (bochs->mmio) { + if (bochs_uses_mmio(bochs)) { int offset = 0x500 + (reg << 1); ret = readw(bochs->mmio + offset); @@ -140,7 +146,7 @@ static u16 bochs_dispi_read(struct bochs_device *bochs, u16 reg) static void bochs_dispi_write(struct bochs_device *bochs, u16 reg, u16 val) { - if (bochs->mmio) { + if (bochs_uses_mmio(bochs)) { int offset = 0x500 + (reg << 1); writew(val, bochs->mmio + offset); @@ -228,7 +234,7 @@ static int bochs_hw_init(struct drm_device *dev) DRM_ERROR("Cannot map mmio region\n"); return -ENOMEM; } - } else { + } else if (IS_ENABLED(CONFIG_HAS_IOPORT)) { ioaddr = VBE_DISPI_IOPORT_INDEX; iosize = 2; if (!request_region(ioaddr, iosize, "bochs-drm")) { @@ -236,6 +242,9 @@ static int bochs_hw_init(struct drm_device *dev) return -EBUSY; } bochs->ioports = 1; + } else { + dev_err(dev->dev, "I/O ports are not supported\n"); + return -EIO; } id = bochs_dispi_read(bochs, VBE_DISPI_INDEX_ID); diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c index 751326e3d9c3..e31e1df029ab 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 7bbe46a98ff1..116f58774135 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