linux-kernel - Re: [PATCH v1] microblaze/PCI: Remove pci_phys_mem_access

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Date:   Mon, 24 Jan 2022 13:12:25 +0100
From:   Michal Simek <monstr@...str.eu>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v1] microblaze/PCI: Remove pci_phys_mem_access_prot() dead
 code



On 1/21/22 21:51, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> pci_phys_mem_access_prot() is defined but never used.  Remove it.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>   arch/microblaze/include/asm/pci.h |  4 ---
>   arch/microblaze/pci/pci-common.c  | 49 -------------------------------
>   2 files changed, 53 deletions(-)
> 
> diff --git a/arch/microblaze/include/asm/pci.h b/arch/microblaze/include/asm/pci.h
> index 7c4dc5d85f53..d90528064604 100644
> --- a/arch/microblaze/include/asm/pci.h
> +++ b/arch/microblaze/include/asm/pci.h
> @@ -61,10 +61,6 @@ extern int pci_mmap_legacy_page_range(struct pci_bus *bus,
>   extern void pcibios_resource_survey(void);
>   
>   struct file;
> -extern pgprot_t	pci_phys_mem_access_prot(struct file *file,
> -					 unsigned long pfn,
> -					 unsigned long size,
> -					 pgprot_t prot);
>   
>   /* This part of code was originally in xilinx-pci.h */
>   #ifdef CONFIG_PCI_XILINX
> diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
> index 622a4867f9e9..33bab7eec731 100644
> --- a/arch/microblaze/pci/pci-common.c
> +++ b/arch/microblaze/pci/pci-common.c
> @@ -165,55 +165,6 @@ int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
>   	return 0;
>   }
>   
> -/*
> - * This one is used by /dev/mem and fbdev who have no clue about the
> - * PCI device, it tries to find the PCI device first and calls the
> - * above routine
> - */
> -pgprot_t pci_phys_mem_access_prot(struct file *file,
> -				  unsigned long pfn,
> -				  unsigned long size,
> -				  pgprot_t prot)
> -{
> -	struct pci_dev *pdev = NULL;
> -	struct resource *found = NULL;
> -	resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT;
> -	int i;
> -
> -	if (page_is_ram(pfn))
> -		return prot;
> -
> -	prot = pgprot_noncached(prot);
> -	for_each_pci_dev(pdev) {
> -		for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
> -			struct resource *rp = &pdev->resource[i];
> -			int flags = rp->flags;
> -
> -			/* Active and same type? */
> -			if ((flags & IORESOURCE_MEM) == 0)
> -				continue;
> -			/* In the range of this resource? */
> -			if (offset < (rp->start & PAGE_MASK) ||
> -			    offset > rp->end)
> -				continue;
> -			found = rp;
> -			break;
> -		}
> -		if (found)
> -			break;
> -	}
> -	if (found) {
> -		if (found->flags & IORESOURCE_PREFETCH)
> -			prot = pgprot_noncached_wc(prot);
> -		pci_dev_put(pdev);
> -	}
> -
> -	pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n",
> -		 (unsigned long long)offset, pgprot_val(prot));
> -
> -	return prot;
> -}
> -
>   /* This provides legacy IO read access on a bus */
>   int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
>   {

Applied.
M

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Xilinx Microblaze
Maintainer of Linux kernel - Xilinx Zynq ARM and ZynqMP ARM64 SoCs
U-Boot custodian - Xilinx Microblaze/Zynq/ZynqMP/Versal SoCs