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Merge branch 'pci/resource-mmap' 

- use generic pci_mmap_resource_range() instead of powerpc and xtensa
    arch-specific versions (David Woodhouse)

* pci/resource-mmap:
  xtensa/PCI: Use generic pci_mmap_resource_range()
  powerpc/pci: Use generic pci_mmap_resource_range()
This commit is contained in:
Bjorn Helgaas 2018-04-04 13:28:11 -05:00 committed by Bjorn Helgaas
parent 64ae499cf2 46e15a2a71
commit 1e1b3201ab
4 changed files with 27 additions and 189 deletions
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9
arch/powerpc/include/asm/pci.h
View File

@ -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);

106
arch/powerpc/kernel/pci-common.c
View File

@ -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;
struct pci_controller *hose = pci_bus_to_host(pdev->bus);
resource_size_t ioaddr = pci_resource_start(pdev, bar);
if (hose == NULL)
return NULL; /* should never happen */
if (!hose)
return -EINVAL;
/* 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;
}
/* Convert to an offset within this PCI controller */
ioaddr -= (unsigned long)hose->io_base_virt - _IO_BASE;
/*
* 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;
/* 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;
/* found it! construct the final physical address */
if (mmap_state == pci_mmap_io)
*offset += hose->io_base_phys - io_offset;
return rp;
}
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)
{

7
arch/xtensa/include/asm/pci.h
View File

@ -44,9 +44,10 @@ extern struct pci_controller* pcibios_alloc_controller(void);
#define PCI_DMA_BUS_IS_PHYS (1)
/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */
#define HAVE_PCI_MMAP 1
#define arch_can_pci_mmap_io() 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
#endif /* __KERNEL__ */

94
arch/xtensa/kernel/pci.c
View File

@ -39,7 +39,6 @@
* pcibios_align_resource
* pcibios_fixup_bus
* pci_bus_add_device
* pci_mmap_page_range
*/
struct pci_controller* pci_ctrl_head;
@ -258,98 +257,21 @@ pci_controller_num(struct pci_dev *dev)
#endif /* CONFIG_PROC_FS */
/*
* 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 __inline__ int
__pci_mmap_make_offset(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state)
int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
{
struct pci_controller *pci_ctrl = (struct pci_controller*) dev->sysdata;
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
unsigned long io_offset = 0;
int i, res_bit;
struct pci_controller *pci_ctrl = (struct pci_controller*) pdev->sysdata;
resource_size_t ioaddr = pci_resource_start(pdev, bar);
if (pci_ctrl == 0)
return -EINVAL; /* should never happen */
/* If memory, add on the PCI bridge address offset */
if (mmap_state == pci_mmap_mem) {
res_bit = IORESOURCE_MEM;
} else {
io_offset = (unsigned long)pci_ctrl->io_space.base;
offset += io_offset;
res_bit = IORESOURCE_IO;
}
/* Convert to an offset within this PCI controller */
ioaddr -= (unsigned long)pci_ctrl->io_space.base;
/*
* 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;
/* 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;
/* found it! construct the final physical address */
if (mmap_state == pci_mmap_io)
offset += pci_ctrl->io_space.start - io_offset;
vma->vm_pgoff = offset >> PAGE_SHIFT;
return 0;
}
return -EINVAL;
}
/*
* 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)
{
int ret;
ret = __pci_mmap_make_offset(dev, vma, mmap_state);
if (ret < 0)
return ret;
vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
ret = io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start,vma->vm_page_prot);
return ret;
vma->vm_pgoff += (ioaddr + pci_ctrl->io_space.start) >> PAGE_SHIFT;
return 0;
}