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powerpc: add an ioremap_phb helper

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Factor code shared between pci_64 and electra_cf into a ioremap_pbh helper
that follows the normal ioremap semantics, and returns a useful __iomem
pointer.  Note that it opencodes __ioremap_at as we know from the callers
the slab is available.  Switch pci_64 to also store the result as __iomem
pointer, and unmap the result using iounmap instead of force casting and
using vmalloc APIs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: Gao Xiang <xiang@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Kelley <mikelley@microsoft.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Link: http://lkml.kernel.org/r/20200414131348.444715-7-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2020-06-01 21:50:37 -07:00 committed by Linus Torvalds
parent 515e5b6d90
commit b274014c6d
4 changed files with 54 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/io.h
View File

@ -719,6 +719,8 @@ void __iomem *ioremap_coherent(phys_addr_t address, unsigned long size);
extern void iounmap(volatile void __iomem *addr);
void __iomem *ioremap_phb(phys_addr_t paddr, unsigned long size);
int early_ioremap_range(unsigned long ea, phys_addr_t pa,
unsigned long size, pgprot_t prot);
void __iomem *do_ioremap(phys_addr_t pa, phys_addr_t offset, unsigned long size,

2
arch/powerpc/include/asm/pci-bridge.h
View File

@ -66,7 +66,7 @@ struct pci_controller {
void __iomem *io_base_virt;
#ifdef CONFIG_PPC64
void *io_base_alloc;
void __iomem *io_base_alloc;
#endif
resource_size_t io_base_phys;
resource_size_t pci_io_size;

53
arch/powerpc/kernel/pci_64.c
View File

@ -109,23 +109,46 @@ int pcibios_unmap_io_space(struct pci_bus *bus)
/* Get the host bridge */
hose = pci_bus_to_host(bus);
/* Check if we have IOs allocated */
if (hose->io_base_alloc == NULL)
return 0;
pr_debug("IO unmapping for PHB %pOF\n", hose->dn);
pr_debug(" alloc=0x%p\n", hose->io_base_alloc);
/* This is a PHB, we fully unmap the IO area */
vunmap(hose->io_base_alloc);
iounmap(hose->io_base_alloc);
return 0;
}
EXPORT_SYMBOL_GPL(pcibios_unmap_io_space);
static int pcibios_map_phb_io_space(struct pci_controller *hose)
void __iomem *ioremap_phb(phys_addr_t paddr, unsigned long size)
{
struct vm_struct *area;
unsigned long addr;
WARN_ON_ONCE(paddr & ~PAGE_MASK);
WARN_ON_ONCE(size & ~PAGE_MASK);
/*
* Let's allocate some IO space for that guy. We don't pass VM_IOREMAP
* because we don't care about alignment tricks that the core does in
* that case. Maybe we should due to stupid card with incomplete
* address decoding but I'd rather not deal with those outside of the
* reserved 64K legacy region.
*/
area = __get_vm_area(size, 0, PHB_IO_BASE, PHB_IO_END);
if (!area)
return NULL;
addr = (unsigned long)area->addr;
if (ioremap_page_range(addr, addr + size, paddr,
pgprot_noncached(PAGE_KERNEL))) {
unmap_kernel_range(addr, size);
return NULL;
}
return (void __iomem *)addr;
}
EXPORT_SYMBOL_GPL(ioremap_phb);
static int pcibios_map_phb_io_space(struct pci_controller *hose)
{
unsigned long phys_page;
unsigned long size_page;
unsigned long io_virt_offset;
@ -146,12 +169,11 @@ static int pcibios_map_phb_io_space(struct pci_controller *hose)
* with incomplete address decoding but I'd rather not deal with
* those outside of the reserved 64K legacy region.
*/
area = __get_vm_area(size_page, 0, PHB_IO_BASE, PHB_IO_END);
if (area == NULL)
hose->io_base_alloc = ioremap_phb(phys_page, size_page);
if (!hose->io_base_alloc)
return -ENOMEM;
hose->io_base_alloc = area->addr;
hose->io_base_virt = (void __iomem *)(area->addr +
hose->io_base_phys - phys_page);
hose->io_base_virt = hose->io_base_alloc +
hose->io_base_phys - phys_page;
pr_debug("IO mapping for PHB %pOF\n", hose->dn);
pr_debug(" phys=0x%016llx, virt=0x%p (alloc=0x%p)\n",
@ -159,11 +181,6 @@ static int pcibios_map_phb_io_space(struct pci_controller *hose)
pr_debug(" size=0x%016llx (alloc=0x%016lx)\n",
hose->pci_io_size, size_page);
/* Establish the mapping */
if (__ioremap_at(phys_page, area->addr, size_page,
pgprot_noncached(PAGE_KERNEL)) == NULL)
return -ENOMEM;
/* Fixup hose IO resource */
io_virt_offset = pcibios_io_space_offset(hose);
hose->io_resource.start += io_virt_offset;

45
drivers/pcmcia/electra_cf.c
View File

@ -178,10 +178,9 @@ static int electra_cf_probe(struct platform_device *ofdev)
struct device_node *np = ofdev->dev.of_node;
struct electra_cf_socket *cf;
struct resource mem, io;
int status;
int status = -ENOMEM;
const unsigned int *prop;
int err;
struct vm_struct *area;
err = of_address_to_resource(np, 0, &mem);
if (err)
@ -202,30 +201,19 @@ static int electra_cf_probe(struct platform_device *ofdev)
cf->mem_phys = mem.start;
cf->mem_size = PAGE_ALIGN(resource_size(&mem));
cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
if (!cf->mem_base)
goto out_free_cf;
cf->io_size = PAGE_ALIGN(resource_size(&io));
area = __get_vm_area(cf->io_size, 0, PHB_IO_BASE, PHB_IO_END);
if (area == NULL) {
status = -ENOMEM;
goto fail1;
}
cf->io_virt = (void __iomem *)(area->addr);
cf->io_virt = ioremap_phb(io.start, cf->io_size);
if (!cf->io_virt)
goto out_unmap_mem;
cf->gpio_base = ioremap(0xfc103000, 0x1000);
if (!cf->gpio_base)
goto out_unmap_virt;
dev_set_drvdata(device, cf);
if (!cf->mem_base || !cf->io_virt || !cf->gpio_base ||
(__ioremap_at(io.start, cf->io_virt, cf->io_size,
pgprot_noncached(PAGE_KERNEL)) == NULL)) {
dev_err(device, "can't ioremap ranges\n");
status = -ENOMEM;
goto fail1;
}
cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;
cf->iomem.start = (unsigned long)cf->mem_base;
cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
cf->iomem.flags = IORESOURCE_MEM;
@ -305,14 +293,13 @@ fail1:
if (cf->irq)
free_irq(cf->irq, cf);
if (cf->io_virt)
__iounmap_at(cf->io_virt, cf->io_size);
if (cf->mem_base)
iounmap(cf->mem_base);
if (cf->gpio_base)
iounmap(cf->gpio_base);
if (area)
device_init_wakeup(&ofdev->dev, 0);
iounmap(cf->gpio_base);
out_unmap_virt:
device_init_wakeup(&ofdev->dev, 0);
iounmap(cf->io_virt);
out_unmap_mem:
iounmap(cf->mem_base);
out_free_cf:
kfree(cf);
return status;
@ -330,7 +317,7 @@ static int electra_cf_remove(struct platform_device *ofdev)
free_irq(cf->irq, cf);
del_timer_sync(&cf->timer);
__iounmap_at(cf->io_virt, cf->io_size);
iounmap(cf->io_virt);
iounmap(cf->mem_base);
iounmap(cf->gpio_base);
release_mem_region(cf->mem_phys, cf->mem_size);