From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261554AbVEJE5g (ORCPT ); Tue, 10 May 2005 00:57:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261553AbVEJE5g (ORCPT ); Tue, 10 May 2005 00:57:36 -0400 Received: from gate.crashing.org ([63.228.1.57]:46226 "EHLO gate.crashing.org") by vger.kernel.org with ESMTP id S261554AbVEJE5J (ORCPT ); Tue, 10 May 2005 00:57:09 -0400 Subject: [PATCH] Fix PCI mmap on ppc and ppc64 From: Benjamin Herrenschmidt To: Andrew Morton Cc: Linux Kernel list , linux-pci Content-Type: text/plain Date: Tue, 10 May 2005 14:53:33 +1000 Message-Id: <1115700814.6157.7.camel@gaston> Mime-Version: 1.0 X-Mailer: Evolution 2.2.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi Andrew ! This patch was discussed at length on linux-pci and so far, the last iteration of it didn't raise any comment. It's effect is a nop on architecture that don't define the new pci_resource_to_user() callback anyway. It allows architecture like ppc who put weird things inside of PCI resource structures to convert to some different value for user visible ones. It also fixes mmap'ing of IO space on those archs. Signed-off-by: Benjamin Herrenschmidt Index: linux-work/arch/ppc64/kernel/pci.c =================================================================== --- linux-work.orig/arch/ppc64/kernel/pci.c 2005-05-06 15:39:24.000000000 +1000 +++ linux-work/arch/ppc64/kernel/pci.c 2005-05-09 12:00:54.000000000 +1000 @@ -351,9 +351,12 @@ *offset += hose->pci_mem_offset; res_bit = IORESOURCE_MEM; } else { - io_offset = (unsigned long)hose->io_base_virt; + io_offset = (unsigned long)hose->io_base_virt - pci_io_base; + printk("offset: %lx, io_base_virt: %p, pci_io_base: %lx, io_offset: % lx\n", + *offset, hose->io_base_virt, pci_io_base, io_offset); *offset += io_offset; res_bit = IORESOURCE_IO; + printk(" -> offset: %lx\n", *offset); } /* @@ -373,12 +376,15 @@ continue; /* In the range of this resource? */ + printk(" r%d: %lx -> %lx\n", i, rp->start, rp->end); 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; + if (mmap_state == pci_mmap_io) { + *offset += hose->io_base_phys - io_offset; + printk(" result: %lx\n", *offset); + } return rp; } @@ -941,4 +947,22 @@ } EXPORT_SYMBOL(pci_read_irq_line); +void pci_resource_to_user(const struct pci_dev *dev, int bar, + const struct resource *rsrc, + u64 *start, u64 *end) +{ + struct pci_controller *hose = pci_bus_to_host(dev->bus); + unsigned long offset = 0; + + if (hose == NULL) + return; + + if (rsrc->flags & IORESOURCE_IO) + offset = pci_io_base - (unsigned long)hose->io_base_virt + + hose->io_base_phys; + + *start = rsrc->start + offset; + *end = rsrc->end + offset; +} + #endif /* CONFIG_PPC_MULTIPLATFORM */ Index: linux-work/drivers/pci/pci-sysfs.c =================================================================== --- linux-work.orig/drivers/pci/pci-sysfs.c 2005-05-05 15:56:37.000000000 +1000 +++ linux-work/drivers/pci/pci-sysfs.c 2005-05-09 12:00:54.000000000 +1000 @@ -60,15 +60,18 @@ char * str = buf; int i; int max = 7; + u64 start, end; if (pci_dev->subordinate) max = DEVICE_COUNT_RESOURCE; for (i = 0; i < max; i++) { - str += sprintf(str,"0x%016lx 0x%016lx 0x%016lx\n", - pci_resource_start(pci_dev,i), - pci_resource_end(pci_dev,i), - pci_resource_flags(pci_dev,i)); + struct resource *res = &pci_dev->resource[i]; + pci_resource_to_user(pci_dev, i, res, &start, &end); + str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n", + (unsigned long long)start, + (unsigned long long)end, + (unsigned long long)res->flags); } return (str - buf); } @@ -301,8 +304,21 @@ struct device, kobj)); struct resource *res = (struct resource *)attr->private; enum pci_mmap_state mmap_type; + u64 start, end; + int i; - vma->vm_pgoff += res->start >> PAGE_SHIFT; + for (i = 0; i < PCI_ROM_RESOURCE; i++) + if (res == &pdev->resource[i]) + break; + if (i >= PCI_ROM_RESOURCE) + return -ENODEV; + + /* pci_mmap_page_range() expects the same kind of entry as coming + * from /proc/bus/pci/ which is a "user visible" value. If this is + * different from the resource itself, arch will do necessary fixup. + */ + pci_resource_to_user(pdev, i, res, &start, &end); + vma->vm_pgoff += start >> PAGE_SHIFT; mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; return pci_mmap_page_range(pdev, vma, mmap_type, 0); Index: linux-work/include/asm-ppc64/pci.h =================================================================== --- linux-work.orig/include/asm-ppc64/pci.h 2005-05-02 10:50:01.000000000 +1000 +++ linux-work/include/asm-ppc64/pci.h 2005-05-09 12:00:54.000000000 +1000 @@ -135,6 +135,11 @@ unsigned long offset, unsigned long size, pgprot_t prot); +#define HAVE_ARCH_PCI_RESOURCE_TO_USER +extern void pci_resource_to_user(const struct pci_dev *dev, int bar, + const struct resource *rsrc, + u64 *start, u64 *end); + #endif /* __KERNEL__ */ Index: linux-work/drivers/pci/proc.c =================================================================== --- linux-work.orig/drivers/pci/proc.c 2005-05-05 15:56:37.000000000 +1000 +++ linux-work/drivers/pci/proc.c 2005-05-09 12:00:54.000000000 +1000 @@ -355,14 +355,20 @@ dev->device, dev->irq); /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */ - for(i=0; i<7; i++) + for(i=0; i<7; i++) { + u64 start, end; + pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); seq_printf(m, LONG_FORMAT, - dev->resource[i].start | + ((unsigned long)start) | (dev->resource[i].flags & PCI_REGION_FLAG_MASK)); - for(i=0; i<7; i++) + } + for(i=0; i<7; i++) { + u64 start, end; + pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); seq_printf(m, LONG_FORMAT, dev->resource[i].start < dev->resource[i].end ? - dev->resource[i].end - dev->resource[i].start + 1 : 0); + (unsigned long)(end - start) + 1 : 0); + } seq_putc(m, '\t'); if (drv) seq_printf(m, "%s", drv->name); Index: linux-work/drivers/pci/pci.c =================================================================== --- linux-work.orig/drivers/pci/pci.c 2005-05-05 15:56:37.000000000 +1000 +++ linux-work/drivers/pci/pci.c 2005-05-09 12:00:54.000000000 +1000 @@ -759,7 +759,7 @@ return 0; } #endif - + static int __devinit pci_init(void) { struct pci_dev *dev = NULL; Index: linux-work/include/linux/pci.h =================================================================== --- linux-work.orig/include/linux/pci.h 2005-05-05 15:56:38.000000000 +1000 +++ linux-work/include/linux/pci.h 2005-05-09 12:00:55.000000000 +1000 @@ -1016,6 +1016,21 @@ #define pci_pretty_name(dev) "" #endif + +/* Some archs don't want to expose struct resource to userland as-is + * in sysfs and /proc + */ +#ifndef HAVE_ARCH_PCI_RESOURCE_TO_USER +static void pci_resource_to_user(const struct pci_dev *dev, int bar, + const struct resource *rsrc, + u64 *start, u64 *end) +{ + *start = rsrc->start; + *end = rsrc->end; +} +#endif /* HAVE_ARCH_PCI_RESOURCE_TO_USER */ + + /* * The world is not perfect and supplies us with broken PCI devices. * For at least a part of these bugs we need a work-around, so both Index: linux-work/include/asm-ppc/pci.h =================================================================== --- linux-work.orig/include/asm-ppc/pci.h 2005-05-02 10:49:57.000000000 +1000 +++ linux-work/include/asm-ppc/pci.h 2005-05-09 12:00:55.000000000 +1000 @@ -103,6 +103,12 @@ unsigned long size, pgprot_t prot); +#define HAVE_ARCH_PCI_RESOURCE_TO_USER +extern void pci_resource_to_user(const struct pci_dev *dev, int bar, + const struct resource *rsrc, + u64 *start, u64 *end); + + #endif /* __KERNEL__ */ #endif /* __PPC_PCI_H */ Index: linux-work/arch/ppc/kernel/pci.c =================================================================== --- linux-work.orig/arch/ppc/kernel/pci.c 2005-05-02 10:48:08.000000000 +1000 +++ linux-work/arch/ppc/kernel/pci.c 2005-05-09 12:00:55.000000000 +1000 @@ -1495,7 +1495,7 @@ *offset += hose->pci_mem_offset; res_bit = IORESOURCE_MEM; } else { - io_offset = (unsigned long)hose->io_base_virt; + io_offset = hose->io_base_virt - ___IO_BASE; *offset += io_offset; res_bit = IORESOURCE_IO; } @@ -1522,7 +1522,7 @@ /* found it! construct the final physical address */ if (mmap_state == pci_mmap_io) - *offset += hose->io_base_phys - _IO_BASE; + *offset += hose->io_base_phys - io_offset; return rp; } @@ -1739,6 +1739,23 @@ return result; } +void pci_resource_to_user(const struct pci_dev *dev, int bar, + const struct resource *rsrc, + u64 *start, u64 *end) +{ + struct pci_controller *hose = pci_bus_to_hose(dev->bus->number); + unsigned long offset = 0; + + if (hose == NULL) + return; + + if (rsrc->flags & IORESOURCE_IO) + offset = ___IO_BASE - hose->io_base_virt + hose->io_base_phys; + + *start = rsrc->start + offset; + *end = rsrc->end + offset; +} + void __init pci_init_resource(struct resource *res, unsigned long start, unsigned long end, int flags, char *name)