| Message ID | 1495712248-5232-3-git-send-email-gabriele.paoloni@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Thu, May 25, 2017 at 12:37:23PM +0100, Gabriele Paoloni wrote: > From: "zhichang.yuan" <yuanzhichang@hisilicon.com> > > After introducing the new generic I/O space management(LOGIC_IO), the > original PCI MMIO relevant helpers need to be updated based on the new > interfaces defined in LOGIC_IO. > This patch adapts the corresponding code to match the changes introduced > by LOGIC_IO. > > Signed-off-by: zhichang.yuan <yuanzhichang@hisilicon.com> > Signed-off-by: Gabriele Paoloni <gabriele.paoloni@huawei.com> > Signed-off-by: Arnd Bergmann <arnd@arndb.de> #earlier draft Not sure how you plan to merge this, but here's my ack: Acked-by: Bjorn Helgaas <bhelgaas@google.com> If you split this as suggested below, add my ack to all three patches. > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index b01bd5b..c9fe12b 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c >... > -int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size) > +int pci_register_io_range(struct fwnode_handle *fwnode, phys_addr_t addr, > + resource_size_t size) It's trivial and nit-picky, but I would do the __weak removal in its own patch. It's obviously fine because there's only one implementation, but it's unrelated to the main point of this patch. I would split the signature change (fwnode addition) to a separate patch, too, just to make the actual change more obvious, especially since that's the only part that crosses subsystems (ACPI, PCI, OF). > { > - int err = 0; > - > + int ret = 0; > #ifdef PCI_IOBASE > - struct io_range *range; > - resource_size_t allocated_size = 0; > - > - /* check if the range hasn't been previously recorded */ > - spin_lock(&io_range_lock); > - list_for_each_entry(range, &io_range_list, list) { > - if (addr >= range->start && addr + size <= range->start + size) { > - /* range already registered, bail out */ > - goto end_register; > - } > - allocated_size += range->size; > - } > - > - /* range not registed yet, check for available space */ > - if (allocated_size + size - 1 > IO_SPACE_LIMIT) { > - /* if it's too big check if 64K space can be reserved */ > - if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) { > - err = -E2BIG; > - goto end_register; > - } > - > - size = SZ_64K; > - pr_warn("Requested IO range too big, new size set to 64K\n"); > - } > + struct logic_pio_hwaddr *range; > > - /* add the range to the list */ > - range = kzalloc(sizeof(*range), GFP_ATOMIC); > - if (!range) { > - err = -ENOMEM; > - goto end_register; > - } > + if (!size || addr + size < addr) > + return -EINVAL; > > - range->start = addr; > + range = kzalloc(sizeof(*range), GFP_KERNEL); > + if (!range) > + return -ENOMEM; Add a blank line here. > + range->fwnode = fwnode; > range->size = size; > + range->hw_start = addr; > + range->flags = PIO_CPU_MMIO; > > - list_add_tail(&range->list, &io_range_list); > - > -end_register: > - spin_unlock(&io_range_lock); > + ret = logic_pio_register_range(range); > + if (ret) > + kfree(range); > #endif > > - return err; > + return ret; > }
Hi Bjorn > -----Original Message----- > From: Bjorn Helgaas [mailto:helgaas@kernel.org] > Sent: 26 May 2017 22:20 > To: Gabriele Paoloni > Cc: catalin.marinas@arm.com; will.deacon@arm.com; robh+dt@kernel.org; > frowand.list@gmail.com; bhelgaas@google.com; rafael@kernel.org; > arnd@arndb.de; linux-arm-kernel@lists.infradead.org; > lorenzo.pieralisi@arm.com; mark.rutland@arm.com; minyard@acm.org; > benh@kernel.crashing.org; John Garry; linux-kernel@vger.kernel.org; > xuwei (O); Linuxarm; linux-acpi@vger.kernel.org; zhichang.yuan; linux- > pci@vger.kernel.org; olof@lixom.net; brian.starkey@arm.com > Subject: Re: [PATCH v9 2/7] PCI: Apply the new generic I/O management > on PCI IO hosts > > On Thu, May 25, 2017 at 12:37:23PM +0100, Gabriele Paoloni wrote: > > From: "zhichang.yuan" <yuanzhichang@hisilicon.com> > > > > After introducing the new generic I/O space management(LOGIC_IO), the > > original PCI MMIO relevant helpers need to be updated based on the > new > > interfaces defined in LOGIC_IO. > > This patch adapts the corresponding code to match the changes > introduced > > by LOGIC_IO. > > > > Signed-off-by: zhichang.yuan <yuanzhichang@hisilicon.com> > > Signed-off-by: Gabriele Paoloni <gabriele.paoloni@huawei.com> > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> #earlier draft > > Not sure how you plan to merge this, but here's my ack: > > Acked-by: Bjorn Helgaas <bhelgaas@google.com> Many thanks for your Ack :) Maybe Arnd can take the whole patchset (or just the lib framework + DT part leaving the ACPI part to Lorenzo)....? > > If you split this as suggested below, add my ack to all three patches. Sure I will > > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > > index b01bd5b..c9fe12b 100644 > > --- a/drivers/pci/pci.c > > +++ b/drivers/pci/pci.c > >... > > > -int __weak pci_register_io_range(phys_addr_t addr, resource_size_t > size) > > +int pci_register_io_range(struct fwnode_handle *fwnode, phys_addr_t > addr, > > + resource_size_t size) > > It's trivial and nit-picky, but I would do the __weak removal in its > own patch. It's obviously fine because there's only one > implementation, but it's unrelated to the main point of this patch. Agreed > > I would split the signature change (fwnode addition) to a separate > patch, too, just to make the actual change more obvious, especially > since that's the only part that crosses subsystems (ACPI, PCI, OF). Agreed too > > > { > > - int err = 0; > > - > > + int ret = 0; > > #ifdef PCI_IOBASE > > - struct io_range *range; > > - resource_size_t allocated_size = 0; > > - > > - /* check if the range hasn't been previously recorded */ > > - spin_lock(&io_range_lock); > > - list_for_each_entry(range, &io_range_list, list) { > > - if (addr >= range->start && addr + size <= range->start + > size) { > > - /* range already registered, bail out */ > > - goto end_register; > > - } > > - allocated_size += range->size; > > - } > > - > > - /* range not registed yet, check for available space */ > > - if (allocated_size + size - 1 > IO_SPACE_LIMIT) { > > - /* if it's too big check if 64K space can be reserved */ > > - if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) { > > - err = -E2BIG; > > - goto end_register; > > - } > > - > > - size = SZ_64K; > > - pr_warn("Requested IO range too big, new size set to > 64K\n"); > > - } > > + struct logic_pio_hwaddr *range; > > > > - /* add the range to the list */ > > - range = kzalloc(sizeof(*range), GFP_ATOMIC); > > - if (!range) { > > - err = -ENOMEM; > > - goto end_register; > > - } > > + if (!size || addr + size < addr) > > + return -EINVAL; > > > > - range->start = addr; > > + range = kzalloc(sizeof(*range), GFP_KERNEL); > > + if (!range) > > + return -ENOMEM; > > Add a blank line here. Yep I will Cheers Gab > > > + range->fwnode = fwnode; > > range->size = size; > > + range->hw_start = addr; > > + range->flags = PIO_CPU_MMIO; > > > > - list_add_tail(&range->list, &io_range_list); > > - > > -end_register: > > - spin_unlock(&io_range_lock); > > + ret = logic_pio_register_range(range); > > + if (ret) > > + kfree(range); > > #endif > > > > - return err; > > + return ret; > > }
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 919be0a..4d8cc24 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -730,7 +730,8 @@ static void acpi_pci_root_validate_resources(struct device *dev, } } -static void acpi_pci_root_remap_iospace(struct resource_entry *entry) +static void acpi_pci_root_remap_iospace(struct fwnode_handle *fwnode, + struct resource_entry *entry) { #ifdef PCI_IOBASE struct resource *res = entry->res; @@ -739,7 +740,7 @@ static void acpi_pci_root_remap_iospace(struct resource_entry *entry) resource_size_t length = resource_size(res); unsigned long port; - if (pci_register_io_range(cpu_addr, length)) + if (pci_register_io_range(fwnode, cpu_addr, length)) goto err; port = pci_address_to_pio(cpu_addr); @@ -781,7 +782,8 @@ int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) else { resource_list_for_each_entry_safe(entry, tmp, list) { if (entry->res->flags & IORESOURCE_IO) - acpi_pci_root_remap_iospace(entry); + acpi_pci_root_remap_iospace(&device->fwnode, + entry); if (entry->res->flags & IORESOURCE_DISABLED) resource_list_destroy_entry(entry); diff --git a/drivers/of/address.c b/drivers/of/address.c index 72914cd..34a55e8 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -2,8 +2,10 @@ #define pr_fmt(fmt) "OF: " fmt #include <linux/device.h> +#include <linux/fwnode.h> #include <linux/io.h> #include <linux/ioport.h> +#include <linux/logic_pio.h> #include <linux/module.h> #include <linux/of_address.h> #include <linux/pci.h> @@ -323,7 +325,8 @@ int of_pci_range_to_resource(struct of_pci_range *range, if (res->flags & IORESOURCE_IO) { unsigned long port; - err = pci_register_io_range(range->cpu_addr, range->size); + err = pci_register_io_range(&np->fwnode, range->cpu_addr, + range->size); if (err) goto invalid_range; port = pci_address_to_pio(range->cpu_addr); diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b01bd5b..c9fe12b 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -21,6 +21,7 @@ #include <linux/spinlock.h> #include <linux/string.h> #include <linux/log2.h> +#include <linux/logic_pio.h> #include <linux/pci-aspm.h> #include <linux/pm_wakeup.h> #include <linux/interrupt.h> @@ -3241,68 +3242,34 @@ int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) } EXPORT_SYMBOL(pci_request_regions_exclusive); -#ifdef PCI_IOBASE -struct io_range { - struct list_head list; - phys_addr_t start; - resource_size_t size; -}; - -static LIST_HEAD(io_range_list); -static DEFINE_SPINLOCK(io_range_lock); -#endif - /* * Record the PCI IO range (expressed as CPU physical address + size). * Return a negative value if an error has occured, zero otherwise */ -int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size) +int pci_register_io_range(struct fwnode_handle *fwnode, phys_addr_t addr, + resource_size_t size) { - int err = 0; - + int ret = 0; #ifdef PCI_IOBASE - struct io_range *range; - resource_size_t allocated_size = 0; - - /* check if the range hasn't been previously recorded */ - spin_lock(&io_range_lock); - list_for_each_entry(range, &io_range_list, list) { - if (addr >= range->start && addr + size <= range->start + size) { - /* range already registered, bail out */ - goto end_register; - } - allocated_size += range->size; - } - - /* range not registed yet, check for available space */ - if (allocated_size + size - 1 > IO_SPACE_LIMIT) { - /* if it's too big check if 64K space can be reserved */ - if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) { - err = -E2BIG; - goto end_register; - } - - size = SZ_64K; - pr_warn("Requested IO range too big, new size set to 64K\n"); - } + struct logic_pio_hwaddr *range; - /* add the range to the list */ - range = kzalloc(sizeof(*range), GFP_ATOMIC); - if (!range) { - err = -ENOMEM; - goto end_register; - } + if (!size || addr + size < addr) + return -EINVAL; - range->start = addr; + range = kzalloc(sizeof(*range), GFP_KERNEL); + if (!range) + return -ENOMEM; + range->fwnode = fwnode; range->size = size; + range->hw_start = addr; + range->flags = PIO_CPU_MMIO; - list_add_tail(&range->list, &io_range_list); - -end_register: - spin_unlock(&io_range_lock); + ret = logic_pio_register_range(range); + if (ret) + kfree(range); #endif - return err; + return ret; } phys_addr_t pci_pio_to_address(unsigned long pio) @@ -3310,21 +3277,10 @@ phys_addr_t pci_pio_to_address(unsigned long pio) phys_addr_t address = (phys_addr_t)OF_BAD_ADDR; #ifdef PCI_IOBASE - struct io_range *range; - resource_size_t allocated_size = 0; - - if (pio > IO_SPACE_LIMIT) + if (pio >= MMIO_UPPER_LIMIT) return address; - spin_lock(&io_range_lock); - list_for_each_entry(range, &io_range_list, list) { - if (pio >= allocated_size && pio < allocated_size + range->size) { - address = range->start + pio - allocated_size; - break; - } - allocated_size += range->size; - } - spin_unlock(&io_range_lock); + address = logic_pio_to_hwaddr(pio); #endif return address; @@ -3333,25 +3289,8 @@ phys_addr_t pci_pio_to_address(unsigned long pio) unsigned long __weak pci_address_to_pio(phys_addr_t address) { #ifdef PCI_IOBASE - struct io_range *res; - resource_size_t offset = 0; - unsigned long addr = -1; - - spin_lock(&io_range_lock); - list_for_each_entry(res, &io_range_list, list) { - if (address >= res->start && address < res->start + res->size) { - addr = address - res->start + offset; - break; - } - offset += res->size; - } - spin_unlock(&io_range_lock); - - return addr; + return logic_pio_trans_cpuaddr(address); #else - if (address > IO_SPACE_LIMIT) - return (unsigned long)-1; - return (unsigned long) address; #endif } diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index f7fbec3..41ecc09 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -949,7 +949,7 @@ static inline void iounmap(void __iomem *addr) #define ioport_map ioport_map static inline void __iomem *ioport_map(unsigned long port, unsigned int nr) { - return PCI_IOBASE + (port & IO_SPACE_LIMIT); + return PCI_IOBASE + (port & MMIO_UPPER_LIMIT); } #endif diff --git a/include/linux/pci.h b/include/linux/pci.h index 33c2b0b..e420d03 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1188,7 +1188,8 @@ int __must_check pci_bus_alloc_resource(struct pci_bus *bus, void *alignf_data); -int pci_register_io_range(phys_addr_t addr, resource_size_t size); +int pci_register_io_range(struct fwnode_handle *fwnode, phys_addr_t addr, + resource_size_t size); unsigned long pci_address_to_pio(phys_addr_t addr); phys_addr_t pci_pio_to_address(unsigned long pio); int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);