6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Thomas Zimmermann <tzimmermann@xxxxxxx> [ Upstream commit 036105e3a776b6fc2fe0d262896a23ff2cc2e6b1 ] Add screen_info_get_pci_dev() to find the PCI device of an instance of screen_info. Does nothing on systems without PCI bus. v3: * search PCI device with pci_get_base_class() (Sui) v2: * remove ret from screen_info_pci_dev() (Javier) Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> Reviewed-by: Javier Martinez Canillas <javierm@xxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20240212090736.11464-3-tzimmermann@xxxxxxx Stable-dep-of: c2bc958b2b03 ("fbdev: vesafb: Detect VGA compatibility from screen info's VESA attributes") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/video/Makefile | 1 + drivers/video/screen_info_pci.c | 48 +++++++++++++++++++++++++++++++++ include/linux/screen_info.h | 10 +++++++ 3 files changed, 59 insertions(+) create mode 100644 drivers/video/screen_info_pci.c diff --git a/drivers/video/Makefile b/drivers/video/Makefile index b929b664d52cd..6bbf87c1b579e 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_VIDEO_NOMODESET) += nomodeset.o obj-$(CONFIG_HDMI) += hdmi.o screen_info-y := screen_info_generic.o +screen_info-$(CONFIG_PCI) += screen_info_pci.o obj-$(CONFIG_VT) += console/ obj-$(CONFIG_FB_STI) += console/ diff --git a/drivers/video/screen_info_pci.c b/drivers/video/screen_info_pci.c new file mode 100644 index 0000000000000..d8985a54ce717 --- /dev/null +++ b/drivers/video/screen_info_pci.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/pci.h> +#include <linux/screen_info.h> + +static struct pci_dev *__screen_info_pci_dev(struct resource *res) +{ + struct pci_dev *pdev = NULL; + const struct resource *r = NULL; + + if (!(res->flags & IORESOURCE_MEM)) + return NULL; + + while (!r && (pdev = pci_get_base_class(PCI_BASE_CLASS_DISPLAY, pdev))) { + r = pci_find_resource(pdev, res); + } + + return pdev; +} + +/** + * screen_info_pci_dev() - Return PCI parent device that contains screen_info's framebuffer + * @si: the screen_info + * + * Returns: + * The screen_info's parent device or NULL on success, or a pointer-encoded + * errno value otherwise. The value NULL is not an error. It signals that no + * PCI device has been found. + */ +struct pci_dev *screen_info_pci_dev(const struct screen_info *si) +{ + struct resource res[SCREEN_INFO_MAX_RESOURCES]; + ssize_t i, numres; + + numres = screen_info_resources(si, res, ARRAY_SIZE(res)); + if (numres < 0) + return ERR_PTR(numres); + + for (i = 0; i < numres; ++i) { + struct pci_dev *pdev = __screen_info_pci_dev(&res[i]); + + if (pdev) + return pdev; + } + + return NULL; +} +EXPORT_SYMBOL(screen_info_pci_dev); diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h index e7a02c5609d12..0eae08e3c6f90 100644 --- a/include/linux/screen_info.h +++ b/include/linux/screen_info.h @@ -9,6 +9,7 @@ */ #define SCREEN_INFO_MAX_RESOURCES 3 +struct pci_dev; struct resource; static inline bool __screen_info_has_lfb(unsigned int type) @@ -104,6 +105,15 @@ static inline unsigned int screen_info_video_type(const struct screen_info *si) ssize_t screen_info_resources(const struct screen_info *si, struct resource *r, size_t num); +#if defined(CONFIG_PCI) +struct pci_dev *screen_info_pci_dev(const struct screen_info *si); +#else +static inline struct pci_dev *screen_info_pci_dev(const struct screen_info *si) +{ + return NULL; +} +#endif + extern struct screen_info screen_info; #endif /* _SCREEN_INFO_H */ -- 2.43.0
