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Message-Id: <1519045191-22145-1-git-send-email-dwmw@amazon.co.uk>
Date: Mon, 19 Feb 2018 12:59:51 +0000
From: David Woodhouse <dwmw@...zon.co.uk>
To: mpe@...erman.id.au, benh@...nel.crashing.org, bhelgaas@...gle.com,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org
Subject: [PATCH] powerpc: Use generic pci_mmap_resource_range()
Commit f719582435 ("PCI: Add pci_mmap_resource_range() and use it for
ARM64") added this generic function with the intent of using it
everywhere and ultimately killing the old arch-specific implementations.
Let's get on with that eradication...
Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
---
arch/powerpc/include/asm/pci.h | 9 ++--
arch/powerpc/kernel/pci-common.c | 106 ++++-----------------------------------
2 files changed, 15 insertions(+), 100 deletions(-)
diff --git a/arch/powerpc/include/asm/pci.h b/arch/powerpc/include/asm/pci.h
index d82802f..401c62a 100644
--- a/arch/powerpc/include/asm/pci.h
+++ b/arch/powerpc/include/asm/pci.h
@@ -76,10 +76,11 @@ extern int pci_proc_domain(struct pci_bus *bus);
struct vm_area_struct;
-/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() and it does WC */
-#define HAVE_PCI_MMAP 1
-#define arch_can_pci_mmap_io() 1
-#define arch_can_pci_mmap_wc() 1
+/* Tell PCI code what kind of PCI resource mappings we support */
+#define HAVE_PCI_MMAP 1
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE 1
+#define arch_can_pci_mmap_io() 1
+#define arch_can_pci_mmap_wc() 1
extern int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val,
size_t count);
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 446c796..fe9733f 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -410,72 +410,22 @@ static int pci_read_irq_line(struct pci_dev *pci_dev)
}
/*
- * Platform support for /proc/bus/pci/X/Y mmap()s,
- * modelled on the sparc64 implementation by Dave Miller.
+ * Platform support for /proc/bus/pci/X/Y mmap()s.
* -- paulus.
*/
-
-/*
- * Adjust vm_pgoff of VMA such that it is the physical page offset
- * corresponding to the 32-bit pci bus offset for DEV requested by the user.
- *
- * Basically, the user finds the base address for his device which he wishes
- * to mmap. They read the 32-bit value from the config space base register,
- * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
- * offset parameter of mmap on /proc/bus/pci/XXX for that device.
- *
- * Returns negative error code on failure, zero on success.
- */
-static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
- resource_size_t *offset,
- enum pci_mmap_state mmap_state)
+int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
{
- struct pci_controller *hose = pci_bus_to_host(dev->bus);
- unsigned long io_offset = 0;
- int i, res_bit;
-
- if (hose == NULL)
- return NULL; /* should never happen */
-
- /* If memory, add on the PCI bridge address offset */
- if (mmap_state == pci_mmap_mem) {
-#if 0 /* See comment in pci_resource_to_user() for why this is disabled */
- *offset += hose->pci_mem_offset;
-#endif
- res_bit = IORESOURCE_MEM;
- } else {
- io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
- *offset += io_offset;
- res_bit = IORESOURCE_IO;
- }
-
- /*
- * Check that the offset requested corresponds to one of the
- * resources of the device.
- */
- for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
- struct resource *rp = &dev->resource[i];
- int flags = rp->flags;
+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+ resource_size_t ioaddr = pci_resource_start(pdev, bar);
- /* treat ROM as memory (should be already) */
- if (i == PCI_ROM_RESOURCE)
- flags |= IORESOURCE_MEM;
-
- /* Active and same type? */
- if ((flags & res_bit) == 0)
- continue;
-
- /* In the range of this resource? */
- if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end)
- continue;
+ if (!hose)
+ return -EINVAL;
- /* found it! construct the final physical address */
- if (mmap_state == pci_mmap_io)
- *offset += hose->io_base_phys - io_offset;
- return rp;
- }
+ /* Convert to an offset within this PCI controller */
+ ioaddr -= (unsigned long)hose->io_base_virt - _IO_BASE;
- return NULL;
+ vma->vm_pgoff += (ioaddr + hose->io_base_phys) >> PAGE_SHIFT;
+ return 0;
}
/*
@@ -527,42 +477,6 @@ pgprot_t pci_phys_mem_access_prot(struct file *file,
return prot;
}
-
-/*
- * Perform the actual remap of the pages for a PCI device mapping, as
- * appropriate for this architecture. The region in the process to map
- * is described by vm_start and vm_end members of VMA, the base physical
- * address is found in vm_pgoff.
- * The pci device structure is provided so that architectures may make mapping
- * decisions on a per-device or per-bus basis.
- *
- * Returns a negative error code on failure, zero on success.
- */
-int pci_mmap_page_range(struct pci_dev *dev, int bar,
- struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- resource_size_t offset =
- ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT;
- struct resource *rp;
- int ret;
-
- rp = __pci_mmap_make_offset(dev, &offset, mmap_state);
- if (rp == NULL)
- return -EINVAL;
-
- vma->vm_pgoff = offset >> PAGE_SHIFT;
- if (write_combine)
- vma->vm_page_prot = pgprot_noncached_wc(vma->vm_page_prot);
- else
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
- ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start, vma->vm_page_prot);
-
- return ret;
-}
-
/* 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)
{
--
2.7.4
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