| Message ID | 1414077787-20633-2-git-send-email-lorenzo.pieralisi@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Thu, Oct 23, 2014 at 04:23:07PM +0100, Lorenzo Pieralisi wrote: > In order to consolidate DT configuration for PCI host controllers in the > kernel, a new API (ie of_pci_get_host_bridge_resources()) was developed > to allow parsing and assigning IO/BUS/MEM resources from DT, removing > duplicated code present in the majority of pci host driver implementations. > > This patch converts the existing PCI generic host controller driver to > the new API. Most of the code parsing ranges and creating resources is > now delegated to of_pci_get_host_bridge_resources() API. > > The PCI host controller code carries out resources filtering on the > resulting resource list and maps IO space by using the newly introduced > pci_ioremap_iospace() API. > > New code supports only one IO resource per generic host controller, which > should cater for all existing host controller configurations. > > Cc: Arnd Bergmann <arnd@arndb.de> > Cc: Will Deacon <will.deacon@arm.com> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > --- > drivers/pci/host/pci-host-generic.c | 120 ++++++++---------------------------- > 1 file changed, 27 insertions(+), 93 deletions(-) Looks fine to me -- I assume you tested this under a 32-bit kernel? Acked-by: Will Deacon <will.deacon@arm.com> Will > diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c > index 1e1a80f..1895907 100644 > --- a/drivers/pci/host/pci-host-generic.c > +++ b/drivers/pci/host/pci-host-generic.c > @@ -32,7 +32,7 @@ struct gen_pci_cfg_bus_ops { > > struct gen_pci_cfg_windows { > struct resource res; > - struct resource bus_range; > + struct resource *bus_range; > void __iomem **win; > > const struct gen_pci_cfg_bus_ops *ops; > @@ -50,7 +50,7 @@ static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus, > { > struct pci_sys_data *sys = bus->sysdata; > struct gen_pci *pci = sys->private_data; > - resource_size_t idx = bus->number - pci->cfg.bus_range.start; > + resource_size_t idx = bus->number - pci->cfg.bus_range->start; > > return pci->cfg.win[idx] + ((devfn << 8) | where); > } > @@ -66,7 +66,7 @@ static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus, > { > struct pci_sys_data *sys = bus->sysdata; > struct gen_pci *pci = sys->private_data; > - resource_size_t idx = bus->number - pci->cfg.bus_range.start; > + resource_size_t idx = bus->number - pci->cfg.bus_range->start; > > return pci->cfg.win[idx] + ((devfn << 12) | where); > } > @@ -138,106 +138,50 @@ static const struct of_device_id gen_pci_of_match[] = { > }; > MODULE_DEVICE_TABLE(of, gen_pci_of_match); > > -static int gen_pci_calc_io_offset(struct device *dev, > - struct of_pci_range *range, > - struct resource *res, > - resource_size_t *offset) > -{ > - static atomic_t wins = ATOMIC_INIT(0); > - int err, idx, max_win; > - unsigned int window; > - > - if (!PAGE_ALIGNED(range->cpu_addr)) > - return -EINVAL; > - > - max_win = (IO_SPACE_LIMIT + 1) / SZ_64K; > - idx = atomic_inc_return(&wins); > - if (idx > max_win) > - return -ENOSPC; > - > - window = (idx - 1) * SZ_64K; > - err = pci_ioremap_io(window, range->cpu_addr); > - if (err) > - return err; > - > - of_pci_range_to_resource(range, dev->of_node, res); > - res->start = window; > - res->end = res->start + range->size - 1; > - *offset = window - range->pci_addr; > - return 0; > -} > - > -static int gen_pci_calc_mem_offset(struct device *dev, > - struct of_pci_range *range, > - struct resource *res, > - resource_size_t *offset) > -{ > - of_pci_range_to_resource(range, dev->of_node, res); > - *offset = range->cpu_addr - range->pci_addr; > - return 0; > -} > - > static void gen_pci_release_of_pci_ranges(struct gen_pci *pci) > { > - struct pci_host_bridge_window *win; > - > - list_for_each_entry(win, &pci->resources, list) > - release_resource(win->res); > - > pci_free_resource_list(&pci->resources); > } > > static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci) > { > - struct of_pci_range range; > - struct of_pci_range_parser parser; > int err, res_valid = 0; > struct device *dev = pci->host.dev.parent; > struct device_node *np = dev->of_node; > + resource_size_t iobase; > + struct pci_host_bridge_window *win; > > - if (of_pci_range_parser_init(&parser, np)) { > - dev_err(dev, "missing \"ranges\" property\n"); > - return -EINVAL; > - } > + err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources, > + &iobase); > + if (err) > + return err; > > - for_each_of_pci_range(&parser, &range) { > - struct resource *parent, *res; > - resource_size_t offset; > - u32 restype = range.flags & IORESOURCE_TYPE_BITS; > + list_for_each_entry(win, &pci->resources, list) { > + struct resource *parent, *res = win->res; > > - res = devm_kmalloc(dev, sizeof(*res), GFP_KERNEL); > - if (!res) { > - err = -ENOMEM; > - goto out_release_res; > - } > - > - switch (restype) { > + switch (resource_type(res)) { > case IORESOURCE_IO: > parent = &ioport_resource; > - err = gen_pci_calc_io_offset(dev, &range, res, &offset); > + err = pci_remap_iospace(res, iobase); > + if (err) { > + dev_warn(dev, "error %d: failed to map resource %pR\n", > + err, res); > + continue; > + } > break; > case IORESOURCE_MEM: > parent = &iomem_resource; > - err = gen_pci_calc_mem_offset(dev, &range, res, &offset); > - res_valid |= !(res->flags & IORESOURCE_PREFETCH || err); > + res_valid |= !(res->flags & IORESOURCE_PREFETCH); > break; > + case IORESOURCE_BUS: > + pci->cfg.bus_range = res; > default: > - err = -EINVAL; > continue; > } > > - if (err) { > - dev_warn(dev, > - "error %d: failed to add resource [type 0x%x, %lld bytes]\n", > - err, restype, range.size); > - continue; > - } > - > - err = request_resource(parent, res); > + err = devm_request_resource(dev, parent, res); > if (err) > goto out_release_res; > - > - pci_add_resource_offset(&pci->resources, res, offset); > } > > if (!res_valid) { > @@ -262,14 +206,6 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci) > struct device *dev = pci->host.dev.parent; > struct device_node *np = dev->of_node; > > - if (of_pci_parse_bus_range(np, &pci->cfg.bus_range)) > - pci->cfg.bus_range = (struct resource) { > - .name = np->name, > - .start = 0, > - .end = 0xff, > - .flags = IORESOURCE_BUS, > - }; > - > err = of_address_to_resource(np, 0, &pci->cfg.res); > if (err) { > dev_err(dev, "missing \"reg\" property\n"); > @@ -277,12 +213,12 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci) > } > > /* Limit the bus-range to fit within reg */ > - bus_max = pci->cfg.bus_range.start + > + bus_max = pci->cfg.bus_range->start + > (resource_size(&pci->cfg.res) >> pci->cfg.ops->bus_shift) - 1; > - pci->cfg.bus_range.end = min_t(resource_size_t, pci->cfg.bus_range.end, > - bus_max); > + pci->cfg.bus_range->end = min_t(resource_size_t, > + pci->cfg.bus_range->end, bus_max); > > - pci->cfg.win = devm_kcalloc(dev, resource_size(&pci->cfg.bus_range), > + pci->cfg.win = devm_kcalloc(dev, resource_size(pci->cfg.bus_range), > sizeof(*pci->cfg.win), GFP_KERNEL); > if (!pci->cfg.win) > return -ENOMEM; > @@ -293,7 +229,7 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci) > "Configuration Space")) > return -ENOMEM; > > - bus_range = &pci->cfg.bus_range; > + bus_range = pci->cfg.bus_range; > for (busn = bus_range->start; busn <= bus_range->end; ++busn) { > u32 idx = busn - bus_range->start; > u32 sz = 1 << pci->cfg.ops->bus_shift; > @@ -305,8 +241,6 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci) > return -ENOMEM; > } > > - /* Register bus resource */ > - pci_add_resource(&pci->resources, bus_range); > return 0; > } > > -- > 2.1.2 > -- 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
On Mon, Oct 27, 2014 at 12:03:35PM +0000, Will Deacon wrote: > On Thu, Oct 23, 2014 at 04:23:07PM +0100, Lorenzo Pieralisi wrote: > > In order to consolidate DT configuration for PCI host controllers in the > > kernel, a new API (ie of_pci_get_host_bridge_resources()) was developed > > to allow parsing and assigning IO/BUS/MEM resources from DT, removing > > duplicated code present in the majority of pci host driver implementations. > > > > This patch converts the existing PCI generic host controller driver to > > the new API. Most of the code parsing ranges and creating resources is > > now delegated to of_pci_get_host_bridge_resources() API. > > > > The PCI host controller code carries out resources filtering on the > > resulting resource list and maps IO space by using the newly introduced > > pci_ioremap_iospace() API. > > > > New code supports only one IO resource per generic host controller, which > > should cater for all existing host controller configurations. > > > > Cc: Arnd Bergmann <arnd@arndb.de> > > Cc: Will Deacon <will.deacon@arm.com> > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > > --- > > drivers/pci/host/pci-host-generic.c | 120 ++++++++---------------------------- > > 1 file changed, 27 insertions(+), 93 deletions(-) > > Looks fine to me -- I assume you tested this under a 32-bit kernel? Yes, through kvmtools, 32-bit guest on 32/64 bits hosts. I will keep on testing it before asking to merge it in -next. I would be grateful if the parsing logic could be tested on arm64 too (Suravee, did you give them a try ?) and collect the resulting tested-by. > Acked-by: Will Deacon <will.deacon@arm.com> Thank you ! Lorenzo -- 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/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c index 1e1a80f..1895907 100644 --- a/drivers/pci/host/pci-host-generic.c +++ b/drivers/pci/host/pci-host-generic.c @@ -32,7 +32,7 @@ struct gen_pci_cfg_bus_ops { struct gen_pci_cfg_windows { struct resource res; - struct resource bus_range; + struct resource *bus_range; void __iomem **win; const struct gen_pci_cfg_bus_ops *ops; @@ -50,7 +50,7 @@ static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus, { struct pci_sys_data *sys = bus->sysdata; struct gen_pci *pci = sys->private_data; - resource_size_t idx = bus->number - pci->cfg.bus_range.start; + resource_size_t idx = bus->number - pci->cfg.bus_range->start; return pci->cfg.win[idx] + ((devfn << 8) | where); } @@ -66,7 +66,7 @@ static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus, { struct pci_sys_data *sys = bus->sysdata; struct gen_pci *pci = sys->private_data; - resource_size_t idx = bus->number - pci->cfg.bus_range.start; + resource_size_t idx = bus->number - pci->cfg.bus_range->start; return pci->cfg.win[idx] + ((devfn << 12) | where); } @@ -138,106 +138,50 @@ static const struct of_device_id gen_pci_of_match[] = { }; MODULE_DEVICE_TABLE(of, gen_pci_of_match); -static int gen_pci_calc_io_offset(struct device *dev, - struct of_pci_range *range, - struct resource *res, - resource_size_t *offset) -{ - static atomic_t wins = ATOMIC_INIT(0); - int err, idx, max_win; - unsigned int window; - - if (!PAGE_ALIGNED(range->cpu_addr)) - return -EINVAL; - - max_win = (IO_SPACE_LIMIT + 1) / SZ_64K; - idx = atomic_inc_return(&wins); - if (idx > max_win) - return -ENOSPC; - - window = (idx - 1) * SZ_64K; - err = pci_ioremap_io(window, range->cpu_addr); - if (err) - return err; - - of_pci_range_to_resource(range, dev->of_node, res); - res->start = window; - res->end = res->start + range->size - 1; - *offset = window - range->pci_addr; - return 0; -} - -static int gen_pci_calc_mem_offset(struct device *dev, - struct of_pci_range *range, - struct resource *res, - resource_size_t *offset) -{ - of_pci_range_to_resource(range, dev->of_node, res); - *offset = range->cpu_addr - range->pci_addr; - return 0; -} - static void gen_pci_release_of_pci_ranges(struct gen_pci *pci) { - struct pci_host_bridge_window *win; - - list_for_each_entry(win, &pci->resources, list) - release_resource(win->res); - pci_free_resource_list(&pci->resources); } static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci) { - struct of_pci_range range; - struct of_pci_range_parser parser; int err, res_valid = 0; struct device *dev = pci->host.dev.parent; struct device_node *np = dev->of_node; + resource_size_t iobase; + struct pci_host_bridge_window *win; - if (of_pci_range_parser_init(&parser, np)) { - dev_err(dev, "missing \"ranges\" property\n"); - return -EINVAL; - } + err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources, + &iobase); + if (err) + return err; - for_each_of_pci_range(&parser, &range) { - struct resource *parent, *res; - resource_size_t offset; - u32 restype = range.flags & IORESOURCE_TYPE_BITS; + list_for_each_entry(win, &pci->resources, list) { + struct resource *parent, *res = win->res; - res = devm_kmalloc(dev, sizeof(*res), GFP_KERNEL); - if (!res) { - err = -ENOMEM; - goto out_release_res; - } - - switch (restype) { + switch (resource_type(res)) { case IORESOURCE_IO: parent = &ioport_resource; - err = gen_pci_calc_io_offset(dev, &range, res, &offset); + err = pci_remap_iospace(res, iobase); + if (err) { + dev_warn(dev, "error %d: failed to map resource %pR\n", + err, res); + continue; + } break; case IORESOURCE_MEM: parent = &iomem_resource; - err = gen_pci_calc_mem_offset(dev, &range, res, &offset); - res_valid |= !(res->flags & IORESOURCE_PREFETCH || err); + res_valid |= !(res->flags & IORESOURCE_PREFETCH); break; + case IORESOURCE_BUS: + pci->cfg.bus_range = res; default: - err = -EINVAL; continue; } - if (err) { - dev_warn(dev, - "error %d: failed to add resource [type 0x%x, %lld bytes]\n", - err, restype, range.size); - continue; - } - - err = request_resource(parent, res); + err = devm_request_resource(dev, parent, res); if (err) goto out_release_res; - - pci_add_resource_offset(&pci->resources, res, offset); } if (!res_valid) { @@ -262,14 +206,6 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci) struct device *dev = pci->host.dev.parent; struct device_node *np = dev->of_node; - if (of_pci_parse_bus_range(np, &pci->cfg.bus_range)) - pci->cfg.bus_range = (struct resource) { - .name = np->name, - .start = 0, - .end = 0xff, - .flags = IORESOURCE_BUS, - }; - err = of_address_to_resource(np, 0, &pci->cfg.res); if (err) { dev_err(dev, "missing \"reg\" property\n"); @@ -277,12 +213,12 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci) } /* Limit the bus-range to fit within reg */ - bus_max = pci->cfg.bus_range.start + + bus_max = pci->cfg.bus_range->start + (resource_size(&pci->cfg.res) >> pci->cfg.ops->bus_shift) - 1; - pci->cfg.bus_range.end = min_t(resource_size_t, pci->cfg.bus_range.end, - bus_max); + pci->cfg.bus_range->end = min_t(resource_size_t, + pci->cfg.bus_range->end, bus_max); - pci->cfg.win = devm_kcalloc(dev, resource_size(&pci->cfg.bus_range), + pci->cfg.win = devm_kcalloc(dev, resource_size(pci->cfg.bus_range), sizeof(*pci->cfg.win), GFP_KERNEL); if (!pci->cfg.win) return -ENOMEM; @@ -293,7 +229,7 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci) "Configuration Space")) return -ENOMEM; - bus_range = &pci->cfg.bus_range; + bus_range = pci->cfg.bus_range; for (busn = bus_range->start; busn <= bus_range->end; ++busn) { u32 idx = busn - bus_range->start; u32 sz = 1 << pci->cfg.ops->bus_shift; @@ -305,8 +241,6 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci) return -ENOMEM; } - /* Register bus resource */ - pci_add_resource(&pci->resources, bus_range); return 0; }
In order to consolidate DT configuration for PCI host controllers in the kernel, a new API (ie of_pci_get_host_bridge_resources()) was developed to allow parsing and assigning IO/BUS/MEM resources from DT, removing duplicated code present in the majority of pci host driver implementations. This patch converts the existing PCI generic host controller driver to the new API. Most of the code parsing ranges and creating resources is now delegated to of_pci_get_host_bridge_resources() API. The PCI host controller code carries out resources filtering on the resulting resource list and maps IO space by using the newly introduced pci_ioremap_iospace() API. New code supports only one IO resource per generic host controller, which should cater for all existing host controller configurations. Cc: Arnd Bergmann <arnd@arndb.de> Cc: Will Deacon <will.deacon@arm.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> --- drivers/pci/host/pci-host-generic.c | 120 ++++++++---------------------------- 1 file changed, 27 insertions(+), 93 deletions(-)