| Message ID | 1456366370-28995-3-git-send-email-yinghai@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
Hi Yinghai, On Wed, Feb 24, 2016 at 06:11:53PM -0800, Yinghai Lu wrote: > After we add 64bit mmio parsing, we got some "no compatible bridge window" > warning on anther new model that support 64bit resource. > > It turns out that we can not use mem_space.start as 64bit mem space > offset, aka there is mem_space.start != offset. > > Use child_phys_addr to calculate exact offset and record offset in > pbm. > > After patch we get correct offset. > > /pci@305: PCI IO [io 0x2007e00000000-0x2007e0fffffff] offset 2007e00000000 > /pci@305: PCI MEM [mem 0x2000000100000-0x200007effffff] offset 2000000000000 > /pci@305: PCI MEM64 [mem 0x2000100000000-0x2000dffffffff] offset 2000000000000 > ... > pci_sun4v f02ae7f8: PCI host bridge to bus 0000:00 > pci_bus 0000:00: root bus resource [io 0x2007e00000000-0x2007e0fffffff] (bus address [0x0000-0xfffffff]) Just double-checking that your ioport space really contains 256M ports. It's fine if it does; it's just a little unusual. > pci_bus 0000:00: root bus resource [mem 0x2000000100000-0x200007effffff] (bus address [0x00100000-0x7effffff]) > pci_bus 0000:00: root bus resource [mem 0x2000100000000-0x2000dffffffff] (bus address [0x100000000-0xdffffffff]) > > Signed-off-by: Yinghai Lu <yinghai@kernel.org> > Tested-by: Khalid Aziz <khalid.aziz@oracle.com> > --- > arch/sparc/kernel/pci.c | 50 +++++++++++++++++++----------------------- > arch/sparc/kernel/pci_common.c | 32 ++++++++++++++++++++------- > arch/sparc/kernel/pci_impl.h | 4 ++++ > 3 files changed, 50 insertions(+), 36 deletions(-) > > diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c > index badf095..269630a 100644 > --- a/arch/sparc/kernel/pci.c > +++ b/arch/sparc/kernel/pci.c > @@ -654,12 +654,12 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm, > printk("PCI: Scanning PBM %s\n", node->full_name); > > pci_add_resource_offset(&resources, &pbm->io_space, > - pbm->io_space.start); > + pbm->io_offset); > pci_add_resource_offset(&resources, &pbm->mem_space, > - pbm->mem_space.start); > + pbm->mem_offset); > if (pbm->mem64_space.flags) > pci_add_resource_offset(&resources, &pbm->mem64_space, > - pbm->mem_space.start); > + pbm->mem64_offset); > pbm->busn.start = pbm->pci_first_busno; > pbm->busn.end = pbm->pci_last_busno; > pbm->busn.flags = IORESOURCE_BUS; > @@ -733,30 +733,28 @@ int pcibios_enable_device(struct pci_dev *dev, int mask) > static int __pci_mmap_make_offset_bus(struct pci_dev *pdev, struct vm_area_struct *vma, > enum pci_mmap_state mmap_state) > { > - struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller; > - unsigned long space_size, user_offset, user_size; > - > - if (mmap_state == pci_mmap_io) { > - space_size = resource_size(&pbm->io_space); > - } else { > - space_size = resource_size(&pbm->mem_space); > - } > + unsigned long user_offset, user_size; > + struct resource res, *root_bus_res; > + struct pci_bus_region region; > > /* Make sure the request is in range. */ > user_offset = vma->vm_pgoff << PAGE_SHIFT; > user_size = vma->vm_end - vma->vm_start; > > - if (user_offset >= space_size || > - (user_offset + user_size) > space_size) > + region.start = user_offset; > + region.end = user_offset + user_size - 1; > + memset(&res, 0, sizeof(res)); > + if (mmap_state == pci_mmap_io) > + res.flags = IORESOURCE_IO; > + else > + res.flags = IORESOURCE_MEM; > + > + pcibios_bus_to_resource(pdev->bus, &res, ®ion); > + root_bus_res = pci_find_root_bus_resource(pdev->bus, &res); > + if (!root_bus_res) > return -EINVAL; > > - if (mmap_state == pci_mmap_io) { > - vma->vm_pgoff = (pbm->io_space.start + > - user_offset) >> PAGE_SHIFT; > - } else { > - vma->vm_pgoff = (pbm->mem_space.start + > - user_offset) >> PAGE_SHIFT; > - } > + vma->vm_pgoff = res.start >> PAGE_SHIFT; > > return 0; This needs to explain what's unique about sparc that means it needs pci_find_root_bus_resource() when no other arch does. This is used in the pci_mmap_resource() path. I don't understand how that path works on sparc. I tried to work through the simple case of a user mapping the first 4096 bytes of a BAR. Assume the BAR is 4096 bytes in size: # User does something like this: # mmap(NULL, 4096, ..., "/sys/.../resourceN", 0); pci_mmap_resource # At entry, "vma->vm_pgoff" is the offset into the BAR (in pages). # In this case, the user wants the first page of the BAR, so # vma->vm_pgoff == 0. # "res" is the the pdev->resource[n], which contains the CPU # physical address of the BAR. pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS) start = vma->vm_pgoff # == 0 size = 4096 pci_start = 0 # offset into BAR (PCI_MMAP_SYSFS case) # we return 1 because [0x0000-0x0fff] is a valid area in this # BAR pci_resource_to_user(pdev, i, res, &start, &end); # On most platforms: pci_resource_to_user() copies res->start to # *start, so "start" is the CPU physical address of the # BAR. # On sparc: pci_resource_to_user() calls pcibios_resource_to_bus() # (see below), so "start" is the PCI bus address of the BAR. vma->vm_pgoff += start >> PAGE_SHIFT; # On most platforms: "vma->vm_pgoff" is now the CPU physical page # number of the part of the BAR we're mapping. # On sparc: "vma->vm_pgoff" is the PCI bus page number of the part # of the BAR we're mapping. This seems wrong: doesn't the VM # system assume vm_pgoff is a CPU physical page number? if (... && iomem_is_exclusive(start)) # On most platforms, "start" is a CPU physical address, and # iomem_is_exclusive() looks it up in the iomem_resource tree, # which contains resources of CPU physical addresses. # On sparc, "start" is a PCI bus address. How can this work in # iomem_is_exclusive()? I assume the resources in iomem_resource # still contain CPU physical addresses, not PCI bus addresses, # don't they? > } > @@ -977,16 +975,12 @@ void pci_resource_to_user(const struct pci_dev *pdev, int bar, > const struct resource *rp, resource_size_t *start, > resource_size_t *end) > { > - struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller; > - unsigned long offset; > + struct pci_bus_region region; > > - if (rp->flags & IORESOURCE_IO) > - offset = pbm->io_space.start; > - else > - offset = pbm->mem_space.start; > + pcibios_resource_to_bus(pdev->bus, ®ion, (struct resource *)rp); > > - *start = rp->start - offset; > - *end = rp->end - offset; > + *start = region.start; > + *end = region.end; > } > > void pcibios_set_master(struct pci_dev *dev) > diff --git a/arch/sparc/kernel/pci_common.c b/arch/sparc/kernel/pci_common.c > index 33524c1..76998f8 100644 > --- a/arch/sparc/kernel/pci_common.c > +++ b/arch/sparc/kernel/pci_common.c > @@ -410,13 +410,16 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) > > for (i = 0; i < num_pbm_ranges; i++) { > const struct linux_prom_pci_ranges *pr = &pbm_ranges[i]; > - unsigned long a, size; > + unsigned long a, size, region_a; > u32 parent_phys_hi, parent_phys_lo; > + u32 child_phys_mid, child_phys_lo; > u32 size_hi, size_lo; > int type; > > parent_phys_hi = pr->parent_phys_hi; > parent_phys_lo = pr->parent_phys_lo; > + child_phys_mid = pr->child_phys_mid; > + child_phys_lo = pr->child_phys_lo; > if (tlb_type == hypervisor) > parent_phys_hi &= 0x0fffffff; > > @@ -426,6 +429,8 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) > type = (pr->child_phys_hi >> 24) & 0x3; > a = (((unsigned long)parent_phys_hi << 32UL) | > ((unsigned long)parent_phys_lo << 0UL)); > + region_a = (((unsigned long)child_phys_mid << 32UL) | > + ((unsigned long)child_phys_lo << 0UL)); > size = (((unsigned long)size_hi << 32UL) | > ((unsigned long)size_lo << 0UL)); > > @@ -440,6 +445,7 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) > pbm->io_space.start = a; > pbm->io_space.end = a + size - 1UL; > pbm->io_space.flags = IORESOURCE_IO; > + pbm->io_offset = a - region_a; > saw_io = 1; > break; > > @@ -448,6 +454,7 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) > pbm->mem_space.start = a; > pbm->mem_space.end = a + size - 1UL; > pbm->mem_space.flags = IORESOURCE_MEM; > + pbm->mem_offset = a - region_a; > saw_mem = 1; > break; > > @@ -456,6 +463,7 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) > pbm->mem64_space.start = a; > pbm->mem64_space.end = a + size - 1UL; > pbm->mem64_space.flags = IORESOURCE_MEM; > + pbm->mem64_offset = a - region_a; > saw_mem = 1; > break; > > @@ -471,14 +479,22 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) > prom_halt(); > } > > - printk("%s: PCI IO[%llx] MEM[%llx]", > - pbm->name, > - pbm->io_space.start, > - pbm->mem_space.start); > + if (pbm->io_space.flags) > + printk("%s: PCI IO %pR offset %llx\n", > + pbm->name, &pbm->io_space, pbm->io_offset); > + if (pbm->mem_space.flags) > + printk("%s: PCI MEM %pR offset %llx\n", > + pbm->name, &pbm->mem_space, pbm->mem_offset); > + if (pbm->mem64_space.flags && pbm->mem_space.flags) { > + if (pbm->mem64_space.start <= pbm->mem_space.end) > + pbm->mem64_space.start = pbm->mem_space.end + 1; > + if (pbm->mem64_space.start > pbm->mem64_space.end) > + pbm->mem64_space.flags = 0; > + } > + > if (pbm->mem64_space.flags) > - printk(" MEM64[%llx]", > - pbm->mem64_space.start); > - printk("\n"); > + printk("%s: PCI MEM64 %pR offset %llx\n", > + pbm->name, &pbm->mem64_space, pbm->mem64_offset); > > pbm->io_space.name = pbm->mem_space.name = pbm->name; > pbm->mem64_space.name = pbm->name; > diff --git a/arch/sparc/kernel/pci_impl.h b/arch/sparc/kernel/pci_impl.h > index 37222ca..2853af7 100644 > --- a/arch/sparc/kernel/pci_impl.h > +++ b/arch/sparc/kernel/pci_impl.h > @@ -99,6 +99,10 @@ struct pci_pbm_info { > struct resource mem_space; > struct resource mem64_space; > struct resource busn; > + /* offset */ > + resource_size_t io_offset; > + resource_size_t mem_offset; > + resource_size_t mem64_offset; > > /* Base of PCI Config space, can be per-PBM or shared. */ > unsigned long config_space; > -- > 1.8.4.5 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
From: Bjorn Helgaas <helgaas@kernel.org> Date: Thu, 10 Mar 2016 12:24:40 -0600 > Hi Yinghai, > > On Wed, Feb 24, 2016 at 06:11:53PM -0800, Yinghai Lu wrote: >> After we add 64bit mmio parsing, we got some "no compatible bridge window" >> warning on anther new model that support 64bit resource. >> >> It turns out that we can not use mem_space.start as 64bit mem space >> offset, aka there is mem_space.start != offset. >> >> Use child_phys_addr to calculate exact offset and record offset in >> pbm. >> >> After patch we get correct offset. >> >> /pci@305: PCI IO [io 0x2007e00000000-0x2007e0fffffff] offset 2007e00000000 >> /pci@305: PCI MEM [mem 0x2000000100000-0x200007effffff] offset 2000000000000 >> /pci@305: PCI MEM64 [mem 0x2000100000000-0x2000dffffffff] offset 2000000000000 >> ... >> pci_sun4v f02ae7f8: PCI host bridge to bus 0000:00 >> pci_bus 0000:00: root bus resource [io 0x2007e00000000-0x2007e0fffffff] (bus address [0x0000-0xfffffff]) > > Just double-checking that your ioport space really contains 256M ports. > It's fine if it does; it's just a little unusual. It should be 16MB, but we trust the OF properties in the 'pci' device node to determine these ranges and the above must be what it is advertising there. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c index badf095..269630a 100644 --- a/arch/sparc/kernel/pci.c +++ b/arch/sparc/kernel/pci.c @@ -654,12 +654,12 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm, printk("PCI: Scanning PBM %s\n", node->full_name); pci_add_resource_offset(&resources, &pbm->io_space, - pbm->io_space.start); + pbm->io_offset); pci_add_resource_offset(&resources, &pbm->mem_space, - pbm->mem_space.start); + pbm->mem_offset); if (pbm->mem64_space.flags) pci_add_resource_offset(&resources, &pbm->mem64_space, - pbm->mem_space.start); + pbm->mem64_offset); pbm->busn.start = pbm->pci_first_busno; pbm->busn.end = pbm->pci_last_busno; pbm->busn.flags = IORESOURCE_BUS; @@ -733,30 +733,28 @@ int pcibios_enable_device(struct pci_dev *dev, int mask) static int __pci_mmap_make_offset_bus(struct pci_dev *pdev, struct vm_area_struct *vma, enum pci_mmap_state mmap_state) { - struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller; - unsigned long space_size, user_offset, user_size; - - if (mmap_state == pci_mmap_io) { - space_size = resource_size(&pbm->io_space); - } else { - space_size = resource_size(&pbm->mem_space); - } + unsigned long user_offset, user_size; + struct resource res, *root_bus_res; + struct pci_bus_region region; /* Make sure the request is in range. */ user_offset = vma->vm_pgoff << PAGE_SHIFT; user_size = vma->vm_end - vma->vm_start; - if (user_offset >= space_size || - (user_offset + user_size) > space_size) + region.start = user_offset; + region.end = user_offset + user_size - 1; + memset(&res, 0, sizeof(res)); + if (mmap_state == pci_mmap_io) + res.flags = IORESOURCE_IO; + else + res.flags = IORESOURCE_MEM; + + pcibios_bus_to_resource(pdev->bus, &res, ®ion); + root_bus_res = pci_find_root_bus_resource(pdev->bus, &res); + if (!root_bus_res) return -EINVAL; - if (mmap_state == pci_mmap_io) { - vma->vm_pgoff = (pbm->io_space.start + - user_offset) >> PAGE_SHIFT; - } else { - vma->vm_pgoff = (pbm->mem_space.start + - user_offset) >> PAGE_SHIFT; - } + vma->vm_pgoff = res.start >> PAGE_SHIFT; return 0; } @@ -977,16 +975,12 @@ void pci_resource_to_user(const struct pci_dev *pdev, int bar, const struct resource *rp, resource_size_t *start, resource_size_t *end) { - struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller; - unsigned long offset; + struct pci_bus_region region; - if (rp->flags & IORESOURCE_IO) - offset = pbm->io_space.start; - else - offset = pbm->mem_space.start; + pcibios_resource_to_bus(pdev->bus, ®ion, (struct resource *)rp); - *start = rp->start - offset; - *end = rp->end - offset; + *start = region.start; + *end = region.end; } void pcibios_set_master(struct pci_dev *dev) diff --git a/arch/sparc/kernel/pci_common.c b/arch/sparc/kernel/pci_common.c index 33524c1..76998f8 100644 --- a/arch/sparc/kernel/pci_common.c +++ b/arch/sparc/kernel/pci_common.c @@ -410,13 +410,16 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) for (i = 0; i < num_pbm_ranges; i++) { const struct linux_prom_pci_ranges *pr = &pbm_ranges[i]; - unsigned long a, size; + unsigned long a, size, region_a; u32 parent_phys_hi, parent_phys_lo; + u32 child_phys_mid, child_phys_lo; u32 size_hi, size_lo; int type; parent_phys_hi = pr->parent_phys_hi; parent_phys_lo = pr->parent_phys_lo; + child_phys_mid = pr->child_phys_mid; + child_phys_lo = pr->child_phys_lo; if (tlb_type == hypervisor) parent_phys_hi &= 0x0fffffff; @@ -426,6 +429,8 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) type = (pr->child_phys_hi >> 24) & 0x3; a = (((unsigned long)parent_phys_hi << 32UL) | ((unsigned long)parent_phys_lo << 0UL)); + region_a = (((unsigned long)child_phys_mid << 32UL) | + ((unsigned long)child_phys_lo << 0UL)); size = (((unsigned long)size_hi << 32UL) | ((unsigned long)size_lo << 0UL)); @@ -440,6 +445,7 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) pbm->io_space.start = a; pbm->io_space.end = a + size - 1UL; pbm->io_space.flags = IORESOURCE_IO; + pbm->io_offset = a - region_a; saw_io = 1; break; @@ -448,6 +454,7 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) pbm->mem_space.start = a; pbm->mem_space.end = a + size - 1UL; pbm->mem_space.flags = IORESOURCE_MEM; + pbm->mem_offset = a - region_a; saw_mem = 1; break; @@ -456,6 +463,7 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) pbm->mem64_space.start = a; pbm->mem64_space.end = a + size - 1UL; pbm->mem64_space.flags = IORESOURCE_MEM; + pbm->mem64_offset = a - region_a; saw_mem = 1; break; @@ -471,14 +479,22 @@ void pci_determine_mem_io_space(struct pci_pbm_info *pbm) prom_halt(); } - printk("%s: PCI IO[%llx] MEM[%llx]", - pbm->name, - pbm->io_space.start, - pbm->mem_space.start); + if (pbm->io_space.flags) + printk("%s: PCI IO %pR offset %llx\n", + pbm->name, &pbm->io_space, pbm->io_offset); + if (pbm->mem_space.flags) + printk("%s: PCI MEM %pR offset %llx\n", + pbm->name, &pbm->mem_space, pbm->mem_offset); + if (pbm->mem64_space.flags && pbm->mem_space.flags) { + if (pbm->mem64_space.start <= pbm->mem_space.end) + pbm->mem64_space.start = pbm->mem_space.end + 1; + if (pbm->mem64_space.start > pbm->mem64_space.end) + pbm->mem64_space.flags = 0; + } + if (pbm->mem64_space.flags) - printk(" MEM64[%llx]", - pbm->mem64_space.start); - printk("\n"); + printk("%s: PCI MEM64 %pR offset %llx\n", + pbm->name, &pbm->mem64_space, pbm->mem64_offset); pbm->io_space.name = pbm->mem_space.name = pbm->name; pbm->mem64_space.name = pbm->name; diff --git a/arch/sparc/kernel/pci_impl.h b/arch/sparc/kernel/pci_impl.h index 37222ca..2853af7 100644 --- a/arch/sparc/kernel/pci_impl.h +++ b/arch/sparc/kernel/pci_impl.h @@ -99,6 +99,10 @@ struct pci_pbm_info { struct resource mem_space; struct resource mem64_space; struct resource busn; + /* offset */ + resource_size_t io_offset; + resource_size_t mem_offset; + resource_size_t mem64_offset; /* Base of PCI Config space, can be per-PBM or shared. */ unsigned long config_space;