[PATCH 1/2] fbdev: fbmem: add a helper to determine if an aperture is used by a fw fb

[PATCH 1/2] fbdev: fbmem: add a helper to determine if an aperture is used by a fw fb

[Alex Deucher]

Add a function for drivers to check if the a firmware initialized
fb is corresponds to their aperture.  This allows drivers to check if the
device corresponds to what the firmware set up as the display device.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=215203
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1840
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/video/fbdev/core/fbmem.c | 47 ++++++++++++++++++++++++++++++++
 include/linux/fb.h               |  1 +
 2 files changed, 48 insertions(+)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 826175ad88a2..0fa7ede94fa6 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1762,6 +1762,53 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
 }
 EXPORT_SYMBOL(remove_conflicting_framebuffers);
 
+/**
+ * is_firmware_framebuffer - detect if firmware-configured framebuffer matches
+ * @a: memory range, users of which are to be checked
+ *
+ * This function checks framebuffer devices (initialized by firmware/bootloader)
+ * which use memory range described by @a. If @a matchesm the function returns
+ * true, otherwise false.
+ */
+bool is_firmware_framebuffer(struct apertures_struct *a)
+{
+	bool do_free = false;
+	bool found = false;
+	int i;
+
+	if (!a) {
+		a = alloc_apertures(1);
+		if (!a)
+			return false;
+
+		a->ranges[0].base = 0;
+		a->ranges[0].size = ~0;
+		do_free = true;
+	}
+
+	mutex_lock(&registration_lock);
+	/* check all firmware fbs and kick off if the base addr overlaps */
+	for_each_registered_fb(i) {
+		struct apertures_struct *gen_aper;
+
+		if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
+			continue;
+
+		gen_aper = registered_fb[i]->apertures;
+		if (fb_do_apertures_overlap(gen_aper, a)) {
+			found = true;
+			break;
+		}
+	}
+	mutex_unlock(&registration_lock);
+
+	if (do_free)
+		kfree(a);
+
+	return found;
+}
+EXPORT_SYMBOL(is_firmware_framebuffer);
+
 /**
  * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
  * @pdev: PCI device
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 6f3db99ab990..3da95842b207 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -610,6 +610,7 @@ extern int remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
 					       const char *name);
 extern int remove_conflicting_framebuffers(struct apertures_struct *a,
 					   const char *name, bool primary);
+extern bool is_firmware_framebuffer(struct apertures_struct *a);
 extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
 extern int fb_show_logo(struct fb_info *fb_info, int rotate);
 extern char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size);
-- 
2.33.1

[PATCH 2/2] drm/amdgpu: disable runpm if we are the primary adapter

[Alex Deucher]

If we are the primary adapter (i.e., the one used by the firwmare
framebuffer), disable runtime pm.  This fixes a regression caused
by commit 55285e21f045 which results in the displays waking up
shortly after they go to sleep due to teh device coming out of
runtime suspend and sending a hotplug uevent.

v2: squash in reworked fix from Evan

Fixes: 55285e21f045 ("fbdev/efifb: Release PCI device's runtime PM ref during FB destroy")
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=215203
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1840
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h     |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 28 +++++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c |  6 ++++++
 3 files changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index b85b67a88a3d..7d67aec6f4a2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1077,6 +1077,7 @@ struct amdgpu_device {
 	bool                            runpm;
 	bool                            in_runpm;
 	bool                            has_pr3;
+	bool                            is_fw_fb;
 
 	bool                            pm_sysfs_en;
 	bool                            ucode_sysfs_en;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 86ca80da9eea..99370bdd8c5b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -39,6 +39,7 @@
 #include <linux/mmu_notifier.h>
 #include <linux/suspend.h>
 #include <linux/cc_platform.h>
+#include <linux/fb.h>
 
 #include "amdgpu.h"
 #include "amdgpu_irq.h"
@@ -1890,6 +1891,26 @@ MODULE_DEVICE_TABLE(pci, pciidlist);
 
 static const struct drm_driver amdgpu_kms_driver;
 
+static bool amdgpu_is_fw_framebuffer(resource_size_t base,
+				     resource_size_t size)
+{
+	bool found = false;
+#if IS_REACHABLE(CONFIG_FB)
+	struct apertures_struct *a;
+
+	a = alloc_apertures(1);
+	if (!a)
+		return false;
+
+	a->ranges[0].base = base;
+	a->ranges[0].size = size;
+
+	found = is_firmware_framebuffer(a);
+	kfree(a);
+#endif
+	return found;
+}
+
 static int amdgpu_pci_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *ent)
 {
@@ -1898,6 +1919,8 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 	unsigned long flags = ent->driver_data;
 	int ret, retry = 0, i;
 	bool supports_atomic = false;
+	bool is_fw_fb;
+	resource_size_t base, size;
 
 	/* skip devices which are owned by radeon */
 	for (i = 0; i < ARRAY_SIZE(amdgpu_unsupported_pciidlist); i++) {
@@ -1966,6 +1989,10 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 	}
 #endif
 
+	base = pci_resource_start(pdev, 0);
+	size = pci_resource_len(pdev, 0);
+	is_fw_fb = amdgpu_is_fw_framebuffer(base, size);
+
 	/* Get rid of things like offb */
 	ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &amdgpu_kms_driver);
 	if (ret)
@@ -1978,6 +2005,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 	adev->dev  = &pdev->dev;
 	adev->pdev = pdev;
 	ddev = adev_to_drm(adev);
+	adev->is_fw_fb = is_fw_fb;
 
 	if (!supports_atomic)
 		ddev->driver_features &= ~DRIVER_ATOMIC;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 651c7abfde03..09ad17944eb2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -206,6 +206,12 @@ int amdgpu_driver_load_kms(struct amdgpu_device *adev, unsigned long flags)
 			adev->runpm = true;
 			break;
 		}
+		/* XXX: disable runtime pm if we are the primary adapter
+		 * to avoid displays being re-enabled after DPMS.
+		 * This needs to be sorted out and fixed properly.
+		 */
+		if (adev->is_fw_fb)
+			adev->runpm = false;
 		if (adev->runpm)
 			dev_info(adev->dev, "Using BACO for runtime pm\n");
 	}
-- 
2.33.1

Re: [PATCH 1/2] fbdev: fbmem: add a helper to determine if an aperture is used by a fw fb

[Thomas Zimmermann]

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Hi

Am 27.12.21 um 19:25 schrieb Alex Deucher:
> Add a function for drivers to check if the a firmware initialized
> fb is corresponds to their aperture.  This allows drivers to check if the
> device corresponds to what the firmware set up as the display device.

If simpledrm is in use, it will register via DRM aperture helpers. You 
probably need a similar function in drm_aperture.c to handle this.

Best regards
Thomas

> 
> Bug: https://bugzilla.kernel.org/show_bug.cgi?id=215203
> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1840
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> ---
>   drivers/video/fbdev/core/fbmem.c | 47 ++++++++++++++++++++++++++++++++
>   include/linux/fb.h               |  1 +
>   2 files changed, 48 insertions(+)
> 
> diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
> index 826175ad88a2..0fa7ede94fa6 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -1762,6 +1762,53 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
>   }
>   EXPORT_SYMBOL(remove_conflicting_framebuffers);
>   
> +/**
> + * is_firmware_framebuffer - detect if firmware-configured framebuffer matches
> + * @a: memory range, users of which are to be checked
> + *
> + * This function checks framebuffer devices (initialized by firmware/bootloader)
> + * which use memory range described by @a. If @a matchesm the function returns
> + * true, otherwise false.
> + */
> +bool is_firmware_framebuffer(struct apertures_struct *a)
> +{
> +	bool do_free = false;
> +	bool found = false;
> +	int i;
> +
> +	if (!a) {
> +		a = alloc_apertures(1);
> +		if (!a)
> +			return false;
> +
> +		a->ranges[0].base = 0;
> +		a->ranges[0].size = ~0;
> +		do_free = true;
> +	}
> +
> +	mutex_lock(&registration_lock);
> +	/* check all firmware fbs and kick off if the base addr overlaps */
> +	for_each_registered_fb(i) {
> +		struct apertures_struct *gen_aper;
> +
> +		if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
> +			continue;
> +
> +		gen_aper = registered_fb[i]->apertures;
> +		if (fb_do_apertures_overlap(gen_aper, a)) {
> +			found = true;
> +			break;
> +		}
> +	}
> +	mutex_unlock(&registration_lock);
> +
> +	if (do_free)
> +		kfree(a);
> +
> +	return found;
> +}
> +EXPORT_SYMBOL(is_firmware_framebuffer);
> +
>   /**
>    * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
>    * @pdev: PCI device
> diff --git a/include/linux/fb.h b/include/linux/fb.h
> index 6f3db99ab990..3da95842b207 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -610,6 +610,7 @@ extern int remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
>   					       const char *name);
>   extern int remove_conflicting_framebuffers(struct apertures_struct *a,
>   					   const char *name, bool primary);
> +extern bool is_firmware_framebuffer(struct apertures_struct *a);
>   extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
>   extern int fb_show_logo(struct fb_info *fb_info, int rotate);
>   extern char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size);

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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[PATCH 1/2] fbdev: fbmem: add a helper to determine if an aperture is used by a fw fb

[Alex Deucher]

Add a function for drivers to check if the a firmware initialized
fb is corresponds to their aperture.  This allows drivers to check if the
device corresponds to what the firmware set up as the display device.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=215203
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1840
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/video/fbdev/core/fbmem.c | 47 ++++++++++++++++++++++++++++++++
 include/linux/fb.h               |  1 +
 2 files changed, 48 insertions(+)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 826175ad88a2..0fa7ede94fa6 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1762,6 +1762,53 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
 }
 EXPORT_SYMBOL(remove_conflicting_framebuffers);
 
+/**
+ * is_firmware_framebuffer - detect if firmware-configured framebuffer matches
+ * @a: memory range, users of which are to be checked
+ *
+ * This function checks framebuffer devices (initialized by firmware/bootloader)
+ * which use memory range described by @a. If @a matchesm the function returns
+ * true, otherwise false.
+ */
+bool is_firmware_framebuffer(struct apertures_struct *a)
+{
+	bool do_free = false;
+	bool found = false;
+	int i;
+
+	if (!a) {
+		a = alloc_apertures(1);
+		if (!a)
+			return false;
+
+		a->ranges[0].base = 0;
+		a->ranges[0].size = ~0;
+		do_free = true;
+	}
+
+	mutex_lock(&registration_lock);
+	/* check all firmware fbs and kick off if the base addr overlaps */
+	for_each_registered_fb(i) {
+		struct apertures_struct *gen_aper;
+
+		if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
+			continue;
+
+		gen_aper = registered_fb[i]->apertures;
+		if (fb_do_apertures_overlap(gen_aper, a)) {
+			found = true;
+			break;
+		}
+	}
+	mutex_unlock(&registration_lock);
+
+	if (do_free)
+		kfree(a);
+
+	return found;
+}
+EXPORT_SYMBOL(is_firmware_framebuffer);
+
 /**
  * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
  * @pdev: PCI device
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 6f3db99ab990..3da95842b207 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -610,6 +610,7 @@ extern int remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
 					       const char *name);
 extern int remove_conflicting_framebuffers(struct apertures_struct *a,
 					   const char *name, bool primary);
+extern bool is_firmware_framebuffer(struct apertures_struct *a);
 extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
 extern int fb_show_logo(struct fb_info *fb_info, int rotate);
 extern char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size);
-- 
2.33.1