powerpc: Remove file parameter from phys_mem_access_prot()

Remove 'file' parameter from struct machdep_calls.phys_mem_access_prot
and its implementation in pci_phys_mem_access_prot(). The file is not
used on PowerPC. By removing it, a later patch can simplify fbdev's
mmap code, which uses phys_mem_access_prot() on PowerPC.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
[mpe: Rebase on unrelated changes to phys_mem_access_prot()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230922080636.26762-5-tzimmermann@suse.de

Author: Thomas Zimmermann

arch/powerpc/include/asm/machdep.h

@@ -106,8 +106,7 @@ struct machdep_calls {
 	int		(*pci_get_legacy_ide_irq)(struct pci_dev *dev, int channel);
 
 	/* Get access protection for /dev/mem */
-	pgprot_t	(*phys_mem_access_prot)(struct file *file,
-						unsigned long pfn,
+	pgprot_t	(*phys_mem_access_prot)(unsigned long pfn,
 						unsigned long size,
 						pgprot_t vma_prot);
 

arch/powerpc/include/asm/pci.h

@@ -105,9 +105,7 @@ extern void of_scan_pci_bridge(struct pci_dev *dev);
 extern void of_scan_bus(struct device_node *node, struct pci_bus *bus);
 extern void of_rescan_bus(struct device_node *node, struct pci_bus *bus);
 
-struct file;
-extern pgprot_t	pci_phys_mem_access_prot(struct file *file,
-					 unsigned long pfn,
+extern pgprot_t	pci_phys_mem_access_prot(unsigned long pfn,
 					 unsigned long size,
 					 pgprot_t prot);
 

arch/powerpc/include/asm/pgtable.h

@@ -120,9 +120,15 @@ static inline void mark_initmem_nx(void) { }
 int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
 			  pte_t *ptep, pte_t entry, int dirty);
 
+pgprot_t __phys_mem_access_prot(unsigned long pfn, unsigned long size,
+				pgprot_t vma_prot);
+
 struct file;
-pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
-			      unsigned long size, pgprot_t vma_prot);
+static inline pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+					    unsigned long size, pgprot_t vma_prot)
+{
+	return __phys_mem_access_prot(pfn, size, vma_prot);
+}
 #define __HAVE_PHYS_MEM_ACCESS_PROT
 
 void __update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep);

arch/powerpc/kernel/pci-common.c

@@ -521,8 +521,7 @@ int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
  * 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,
+pgprot_t pci_phys_mem_access_prot(unsigned long pfn,
 				  unsigned long size,
 				  pgprot_t prot)
 {

arch/powerpc/mm/mem.c

@@ -35,18 +35,18 @@ unsigned long long memory_limit;
 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
 EXPORT_SYMBOL(empty_zero_page);
 
-pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
-			      unsigned long size, pgprot_t vma_prot)
+pgprot_t __phys_mem_access_prot(unsigned long pfn, unsigned long size,
+				pgprot_t vma_prot)
 {
 	if (ppc_md.phys_mem_access_prot)
-		return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
+		return ppc_md.phys_mem_access_prot(pfn, size, vma_prot);
 
 	if (!page_is_ram(pfn))
 		vma_prot = pgprot_noncached(vma_prot);
 
 	return vma_prot;
 }
-EXPORT_SYMBOL(phys_mem_access_prot);
+EXPORT_SYMBOL(__phys_mem_access_prot);
 
 #ifdef CONFIG_MEMORY_HOTPLUG
 static DEFINE_MUTEX(linear_mapping_mutex);