drm/bochs: Replace deprecated PCI implicit devres

[PATCH] drm/bochs: Replace deprecated PCI implicit devres

Posted by Philipp Stanner 1 month, 1 week ago

bochs uses pcim_enable_device(), which causes pci_request_region() to
implicitly set up devres callbacks which will release the region on
driver detach. Despite this, the driver calls pci_release_regions()
manually on driver teardown.

Implicit devres has been deprecated in PCI in commit 81fcf28e74a3 ("PCI:
Document hybrid devres hazards").

Replace the calls to pci_request_region() with ones to always-managed
pcim_request_region(). Remove the unnecessary call to
pci_release_regions().

Signed-off-by: Philipp Stanner <pstanner@redhat.com>
---
 drivers/gpu/drm/tiny/bochs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/tiny/bochs.c b/drivers/gpu/drm/tiny/bochs.c
index 31fc5d839e10..888f12a67470 100644
--- a/drivers/gpu/drm/tiny/bochs.c
+++ b/drivers/gpu/drm/tiny/bochs.c
@@ -217,7 +217,7 @@ static int bochs_hw_init(struct drm_device *dev)
 
 	if (pdev->resource[2].flags & IORESOURCE_MEM) {
 		/* mmio bar with vga and bochs registers present */
-		if (pci_request_region(pdev, 2, "bochs-drm") != 0) {
+		if (pcim_request_region(pdev, 2, "bochs-drm") != 0) {
 			DRM_ERROR("Cannot request mmio region\n");
 			return -EBUSY;
 		}
@@ -258,7 +258,7 @@ static int bochs_hw_init(struct drm_device *dev)
 		size = min(size, mem);
 	}
 
-	if (pci_request_region(pdev, 0, "bochs-drm") != 0)
+	if (pcim_request_region(pdev, 0, "bochs-drm") != 0)
 		DRM_WARN("Cannot request framebuffer, boot fb still active?\n");
 
 	bochs->fb_map = ioremap(addr, size);
@@ -302,7 +302,7 @@ static void bochs_hw_fini(struct drm_device *dev)
 		release_region(VBE_DISPI_IOPORT_INDEX, 2);
 	if (bochs->fb_map)
 		iounmap(bochs->fb_map);
-	pci_release_regions(to_pci_dev(dev->dev));
+
 	drm_edid_free(bochs->drm_edid);
 }
 
-- 
2.47.0

Re: [PATCH] drm/bochs: Replace deprecated PCI implicit devres

Posted by Philipp Stanner 5 days, 23 hours ago

On Thu, 2024-10-17 at 14:51 +0200, Philipp Stanner wrote:
> bochs uses pcim_enable_device(), which causes pci_request_region() to
> implicitly set up devres callbacks which will release the region on
> driver detach. Despite this, the driver calls pci_release_regions()
> manually on driver teardown.
> 
> Implicit devres has been deprecated in PCI in commit 81fcf28e74a3
> ("PCI:
> Document hybrid devres hazards").
> 
> Replace the calls to pci_request_region() with ones to always-managed
> pcim_request_region(). Remove the unnecessary call to
> pci_release_regions().

Just saw that this patch is still floating around. Anyone feeling
responsible for bochs who could review this?


P.


> 
> Signed-off-by: Philipp Stanner <pstanner@redhat.com>
> ---
>  drivers/gpu/drm/tiny/bochs.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tiny/bochs.c
> b/drivers/gpu/drm/tiny/bochs.c
> index 31fc5d839e10..888f12a67470 100644
> --- a/drivers/gpu/drm/tiny/bochs.c
> +++ b/drivers/gpu/drm/tiny/bochs.c
> @@ -217,7 +217,7 @@ static int bochs_hw_init(struct drm_device *dev)
>  
>  	if (pdev->resource[2].flags & IORESOURCE_MEM) {
>  		/* mmio bar with vga and bochs registers present */
> -		if (pci_request_region(pdev, 2, "bochs-drm") != 0) {
> +		if (pcim_request_region(pdev, 2, "bochs-drm") != 0)
> {
>  			DRM_ERROR("Cannot request mmio region\n");
>  			return -EBUSY;
>  		}
> @@ -258,7 +258,7 @@ static int bochs_hw_init(struct drm_device *dev)
>  		size = min(size, mem);
>  	}
>  
> -	if (pci_request_region(pdev, 0, "bochs-drm") != 0)
> +	if (pcim_request_region(pdev, 0, "bochs-drm") != 0)
>  		DRM_WARN("Cannot request framebuffer, boot fb still
> active?\n");
>  
>  	bochs->fb_map = ioremap(addr, size);
> @@ -302,7 +302,7 @@ static void bochs_hw_fini(struct drm_device *dev)
>  		release_region(VBE_DISPI_IOPORT_INDEX, 2);
>  	if (bochs->fb_map)
>  		iounmap(bochs->fb_map);
> -	pci_release_regions(to_pci_dev(dev->dev));
> +
>  	drm_edid_free(bochs->drm_edid);
>  }
>

Re: [PATCH] drm/bochs: Replace deprecated PCI implicit devres

Posted by Thomas Zimmermann 5 days, 5 hours ago

Hi


Am 20.11.24 um 15:30 schrieb Philipp Stanner:
> On Thu, 2024-10-17 at 14:51 +0200, Philipp Stanner wrote:
>> bochs uses pcim_enable_device(), which causes pci_request_region() to
>> implicitly set up devres callbacks which will release the region on
>> driver detach. Despite this, the driver calls pci_release_regions()
>> manually on driver teardown.
>>
>> Implicit devres has been deprecated in PCI in commit 81fcf28e74a3
>> ("PCI:
>> Document hybrid devres hazards").
>>
>> Replace the calls to pci_request_region() with ones to always-managed
>> pcim_request_region(). Remove the unnecessary call to
>> pci_release_regions().
> Just saw that this patch is still floating around. Anyone feeling
> responsible for bochs who could review this?

It looks like this patch is already outdated. There's been

https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/58e980c16815ce4ff8a5e036a126358afceca538

in drm-misc-next for some time.

Best regards
Thomas

>
>
> P.
>
>
>> Signed-off-by: Philipp Stanner <pstanner@redhat.com>
>> ---
>>   drivers/gpu/drm/tiny/bochs.c | 6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/tiny/bochs.c
>> b/drivers/gpu/drm/tiny/bochs.c
>> index 31fc5d839e10..888f12a67470 100644
>> --- a/drivers/gpu/drm/tiny/bochs.c
>> +++ b/drivers/gpu/drm/tiny/bochs.c
>> @@ -217,7 +217,7 @@ static int bochs_hw_init(struct drm_device *dev)
>>   
>>   	if (pdev->resource[2].flags & IORESOURCE_MEM) {
>>   		/* mmio bar with vga and bochs registers present */
>> -		if (pci_request_region(pdev, 2, "bochs-drm") != 0) {
>> +		if (pcim_request_region(pdev, 2, "bochs-drm") != 0)
>> {
>>   			DRM_ERROR("Cannot request mmio region\n");
>>   			return -EBUSY;
>>   		}
>> @@ -258,7 +258,7 @@ static int bochs_hw_init(struct drm_device *dev)
>>   		size = min(size, mem);
>>   	}
>>   
>> -	if (pci_request_region(pdev, 0, "bochs-drm") != 0)
>> +	if (pcim_request_region(pdev, 0, "bochs-drm") != 0)
>>   		DRM_WARN("Cannot request framebuffer, boot fb still
>> active?\n");
>>   
>>   	bochs->fb_map = ioremap(addr, size);
>> @@ -302,7 +302,7 @@ static void bochs_hw_fini(struct drm_device *dev)
>>   		release_region(VBE_DISPI_IOPORT_INDEX, 2);
>>   	if (bochs->fb_map)
>>   		iounmap(bochs->fb_map);
>> -	pci_release_regions(to_pci_dev(dev->dev));
>> +
>>   	drm_edid_free(bochs->drm_edid);
>>   }
>>   

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)