From: Thomas Zimmermann <tzimmermann@suse.de>
To: javierm@redhat.com, pjones@redhat.com, deller@gmx.de, ardb@kernel.org
Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
Thomas Zimmermann <tzimmermann@suse.de>
Subject: [PATCH 2/8] video: Provide screen_info_get_pci_dev() to find screen_info's PCI device
Date: Wed, 17 Jan 2024 13:39:06 +0100 [thread overview]
Message-ID: <20240117125527.23324-3-tzimmermann@suse.de> (raw)
In-Reply-To: <20240117125527.23324-1-tzimmermann@suse.de>
Add screen_info_get_pci_dev() to find the PCI device of an instance
of screen_info. Does nothing on systems without PCI bus.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/video/Makefile | 1 +
drivers/video/screen_info_pci.c | 54 +++++++++++++++++++++++++++++++++
include/linux/screen_info.h | 10 ++++++
3 files changed, 65 insertions(+)
create mode 100644 drivers/video/screen_info_pci.c
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index b929b664d52c..6bbf87c1b579 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 000000000000..16fe4afa3377
--- /dev/null
+++ b/drivers/video/screen_info_pci.c
@@ -0,0 +1,54 @@
+// 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;
+
+ if (!(res->flags & IORESOURCE_MEM))
+ return NULL;
+
+ for_each_pci_dev(pdev) {
+ const struct resource *r;
+
+ if ((pdev->class >> 16) != PCI_BASE_CLASS_DISPLAY)
+ continue;
+
+ r = pci_find_resource(pdev, res);
+ if (r)
+ return pdev;
+ }
+
+ return NULL;
+}
+
+/**
+ * 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 on success, or NULL otherwise.
+ */
+struct pci_dev *screen_info_pci_dev(const struct screen_info *si)
+{
+ struct resource res[SCREEN_INFO_MAX_RESOURCES];
+ size_t i, numres;
+ int ret;
+
+ ret = screen_info_resources(si, res, ARRAY_SIZE(res));
+ if (ret < 0)
+ return ERR_PTR(ret);
+ numres = ret;
+
+ 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 d4d45395df19..746645b8ee83 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)
int 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
next prev parent reply other threads:[~2024-01-17 12:55 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-17 12:39 [PATCH 0/8] firmware/sysfb: Track parent device for screen_info Thomas Zimmermann
2024-01-17 12:39 ` [PATCH 1/8] video: Add helpers for decoding screen_info Thomas Zimmermann
2024-01-29 10:41 ` Javier Martinez Canillas
2024-01-30 13:12 ` Thomas Zimmermann
2024-01-17 12:39 ` Thomas Zimmermann [this message]
2024-01-29 11:04 ` [PATCH 2/8] video: Provide screen_info_get_pci_dev() to find screen_info's PCI device Javier Martinez Canillas
2024-01-30 10:12 ` Thomas Zimmermann
2024-01-30 10:23 ` Javier Martinez Canillas
2024-01-17 12:39 ` [PATCH 3/8] firmware/sysfb: Set firmware-framebuffer parent device Thomas Zimmermann
2024-01-29 11:28 ` Javier Martinez Canillas
2024-01-17 12:39 ` [PATCH 4/8] fbdev/efifb: Remove PM for " Thomas Zimmermann
2024-01-29 11:30 ` Javier Martinez Canillas
2024-01-17 12:39 ` [PATCH 5/8] firmware/sysfb: Create firmware device only for enabled PCI devices Thomas Zimmermann
2024-01-29 11:36 ` Javier Martinez Canillas
2024-01-30 12:52 ` Thomas Zimmermann
2024-01-17 12:39 ` [PATCH 6/8] fbdev/efifb: Do not track parent device status Thomas Zimmermann
2024-01-29 11:38 ` Javier Martinez Canillas
2024-01-17 12:39 ` [PATCH 7/8] firmware/sysfb: Update screen_info for relocated EFI framebuffers Thomas Zimmermann
2024-01-29 11:52 ` Javier Martinez Canillas
2024-01-29 12:03 ` Javier Martinez Canillas
2024-01-17 12:39 ` [PATCH 8/8] fbdev/efifb: Remove framebuffer relocation tracking Thomas Zimmermann
2024-01-29 12:03 ` Javier Martinez Canillas
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