linux-kernel - Re: [PATCH v5 2/6] drivers:hv: Call vmbus_mmio_free() to reverse vmbus_mmio

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Message-ID: <20160421153733.GA32739@localhost>
Date:	Thu, 21 Apr 2016 10:37:33 -0500
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Jake Oshins <jakeo@...rosoft.com>
Cc:	linux-pci@...r.kernel.org, gregkh@...uxfoundation.org,
	kys@...rosoft.com, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	vkuznets@...hat.com, haiyangz@...rosoft.com, haddenh@...rosoft.com
Subject: Re: [PATCH v5 2/6] drivers:hv: Call vmbus_mmio_free() to reverse
 vmbus_mmio_allocate()

On Tue, Apr 05, 2016 at 06:18:18PM -0700, Jake Oshins wrote:
> Existing code just called release_mem_region().  Adding a
> wrapper around it allows the more complex range tracking
> that is introduced later in this patch series.
> 
> Signed-off-by: Jake Oshins <jakeo@...rosoft.com>

With typo fix below,

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

This is mostly non-PCI, so I assume somebody else will merge this series.

> ---
>  drivers/hv/vmbus_drv.c          | 15 +++++++++++++++
>  drivers/pci/host/pci-hyperv.c   | 14 +++++++-------
>  drivers/video/fbdev/hyperv_fb.c |  4 ++--
>  include/linux/hyperv.h          |  2 +-
>  4 files changed, 25 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 799518b..60553c1 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -1188,6 +1188,21 @@ exit:
>  EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
>  
>  /**
> + * vmbus_free_mmio() - Free a memory-mapped I/O range.
> + * @start:		Base address of region to release.
> + * @size:		Size of the range to be allocated
> + *
> + * This function releases anything requested by
> + * vmbus_mmio_allocate().

s/vmbus_mmio_allocate/vmbus_allocate_mmio/, I think.

> + */
> +void vmbus_free_mmio(resource_size_t start, resource_size_t size)
> +{
> +	release_mem_region(start, size);
> +
> +}
> +EXPORT_SYMBOL_GPL(vmbus_free_mmio);
> +
> +/**
>   * vmbus_cpu_number_to_vp_number() - Map CPU to VP.
>   * @cpu_number: CPU number in Linux terms
>   *
> diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c
> index ed651ba..f2559b6 100644
> --- a/drivers/pci/host/pci-hyperv.c
> +++ b/drivers/pci/host/pci-hyperv.c
> @@ -1795,14 +1795,14 @@ static void hv_pci_free_bridge_windows(struct hv_pcibus_device *hbus)
>  
>  	if (hbus->low_mmio_space && hbus->low_mmio_res) {
>  		hbus->low_mmio_res->flags |= IORESOURCE_BUSY;
> -		release_mem_region(hbus->low_mmio_res->start,
> -				   resource_size(hbus->low_mmio_res));
> +		vmbus_free_mmio(hbus->low_mmio_res->start,
> +				resource_size(hbus->low_mmio_res));
>  	}
>  
>  	if (hbus->high_mmio_space && hbus->high_mmio_res) {
>  		hbus->high_mmio_res->flags |= IORESOURCE_BUSY;
> -		release_mem_region(hbus->high_mmio_res->start,
> -				   resource_size(hbus->high_mmio_res));
> +		vmbus_free_mmio(hbus->high_mmio_res->start,
> +				resource_size(hbus->high_mmio_res));
>  	}
>  }
>  
> @@ -1880,8 +1880,8 @@ static int hv_pci_allocate_bridge_windows(struct hv_pcibus_device *hbus)
>  
>  release_low_mmio:
>  	if (hbus->low_mmio_res) {
> -		release_mem_region(hbus->low_mmio_res->start,
> -				   resource_size(hbus->low_mmio_res));
> +		vmbus_free_mmio(hbus->low_mmio_res->start,
> +				resource_size(hbus->low_mmio_res));
>  	}
>  
>  	return ret;
> @@ -1924,7 +1924,7 @@ static int hv_allocate_config_window(struct hv_pcibus_device *hbus)
>  
>  static void hv_free_config_window(struct hv_pcibus_device *hbus)
>  {
> -	release_mem_region(hbus->mem_config->start, PCI_CONFIG_MMIO_LENGTH);
> +	vmbus_free_mmio(hbus->mem_config->start, PCI_CONFIG_MMIO_LENGTH);
>  }
>  
>  /**
> diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
> index e2451bd..2fd49b2 100644
> --- a/drivers/video/fbdev/hyperv_fb.c
> +++ b/drivers/video/fbdev/hyperv_fb.c
> @@ -743,7 +743,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
>  err3:
>  	iounmap(fb_virt);
>  err2:
> -	release_mem_region(par->mem->start, screen_fb_size);
> +	vmbus_free_mmio(par->mem->start, screen_fb_size);
>  	par->mem = NULL;
>  err1:
>  	if (!gen2vm)
> @@ -758,7 +758,7 @@ static void hvfb_putmem(struct fb_info *info)
>  	struct hvfb_par *par = info->par;
>  
>  	iounmap(info->screen_base);
> -	release_mem_region(par->mem->start, screen_fb_size);
> +	vmbus_free_mmio(par->mem->start, screen_fb_size);
>  	par->mem = NULL;
>  }
>  
> diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
> index aa0fadc..ecd81c3 100644
> --- a/include/linux/hyperv.h
> +++ b/include/linux/hyperv.h
> @@ -1091,7 +1091,7 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
>  			resource_size_t min, resource_size_t max,
>  			resource_size_t size, resource_size_t align,
>  			bool fb_overlap_ok);
> -
> +void vmbus_free_mmio(resource_size_t start, resource_size_t size);
>  int vmbus_cpu_number_to_vp_number(int cpu_number);
>  u64 hv_do_hypercall(u64 control, void *input, void *output);
>  
> -- 
> 1.9.1
>