From: Arnd Bergmann <arnd@arndb.de> To: Liviu Dudau <Liviu.Dudau@arm.com> Cc: linux-pci <linux-pci@vger.kernel.org>, Bjorn Helgaas <bhelgaas@google.com>, Catalin Marinas <Catalin.Marinas@arm.com>, Will Deacon <Will.Deacon@arm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, linaro-kernel <linaro-kernel@lists.linaro.org>, Tanmay Inamdar <tinamdar@apm.com>, Grant Likely <grant.likely@secretlab.ca>, Sinan Kaya <okaya@codeaurora.org>, Jingoo Han <jg1.han@samsung.com>, Kukjin Kim <kgene.kim@samsung.com>, Suravee Suthikulanit <suravee.suthikulpanit@amd.com>, LKML <linux-kernel@vger.kernel.org>, Device Tree ML <devicetree@vger.kernel.org>, LAKML <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH v8 3/9] pci: Introduce pci_register_io_range() helper function. Date: Wed, 02 Jul 2014 14:38:04 +0200 [thread overview] Message-ID: <4751391.BGkeOrZGt8@wuerfel> (raw) In-Reply-To: <1404240214-9804-4-git-send-email-Liviu.Dudau@arm.com> Some more detailed comments now On Tuesday 01 July 2014 19:43:28 Liviu Dudau wrote: > +/* > + * 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) > +{ > +#ifdef PCI_IOBASE > + struct io_range *res; I was confused by the variable naming here: A variable named 'res' is normally a 'struct resource'. Maybe better call this 'range'. > + resource_size_t allocated_size = 0; > + > + /* check if the range hasn't been previously recorded */ > + list_for_each_entry(res, &io_range_list, list) { > + if (addr >= res->start && addr + size <= res->start + size) > + return 0; > + allocated_size += res->size; > + } A spin_lock around the list lookup should be sufficient to get around the race that Will mentioned. > + /* range not registed yet, check for available space */ > + if (allocated_size + size - 1 > IO_SPACE_LIMIT) > + return -E2BIG; It might be better to limit the size to 64K if it doesn't fit at first. Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v8 3/9] pci: Introduce pci_register_io_range() helper function. Date: Wed, 02 Jul 2014 14:38:04 +0200 [thread overview] Message-ID: <4751391.BGkeOrZGt8@wuerfel> (raw) In-Reply-To: <1404240214-9804-4-git-send-email-Liviu.Dudau@arm.com> Some more detailed comments now On Tuesday 01 July 2014 19:43:28 Liviu Dudau wrote: > +/* > + * 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) > +{ > +#ifdef PCI_IOBASE > + struct io_range *res; I was confused by the variable naming here: A variable named 'res' is normally a 'struct resource'. Maybe better call this 'range'. > + resource_size_t allocated_size = 0; > + > + /* check if the range hasn't been previously recorded */ > + list_for_each_entry(res, &io_range_list, list) { > + if (addr >= res->start && addr + size <= res->start + size) > + return 0; > + allocated_size += res->size; > + } A spin_lock around the list lookup should be sufficient to get around the race that Will mentioned. > + /* range not registed yet, check for available space */ > + if (allocated_size + size - 1 > IO_SPACE_LIMIT) > + return -E2BIG; It might be better to limit the size to 64K if it doesn't fit at first. Arnd
next prev parent reply other threads:[~2014-07-02 12:39 UTC|newest] Thread overview: 218+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-07-01 18:43 [PATCH v8 0/9] Support for creating generic PCI host bridges from DT Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` [PATCH v8 1/9] Fix ioport_map() for !CONFIG_GENERIC_IOMAP cases Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` [PATCH v8 2/9] pci: Export find_pci_host_bridge() function Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-02 18:06 ` Tanmay Inamdar 2014-07-02 18:06 ` Tanmay Inamdar 2014-07-02 19:12 ` Arnd Bergmann 2014-07-02 19:12 ` Arnd Bergmann 2014-07-02 20:43 ` Tanmay Inamdar 2014-07-02 20:43 ` Tanmay Inamdar 2014-07-03 9:53 ` Liviu Dudau 2014-07-03 9:53 ` Liviu Dudau 2014-07-03 10:26 ` Arnd Bergmann 2014-07-03 10:26 ` Arnd Bergmann 2014-07-07 23:27 ` Bjorn Helgaas 2014-07-07 23:27 ` Bjorn Helgaas 2014-07-07 23:27 ` Bjorn Helgaas 2014-07-08 10:42 ` Liviu Dudau 2014-07-08 10:42 ` Liviu Dudau 2014-07-08 10:42 ` Liviu Dudau 2014-07-01 18:43 ` [PATCH v8 3/9] pci: Introduce pci_register_io_range() helper function Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 19:36 ` Arnd Bergmann 2014-07-01 19:36 ` Arnd Bergmann 2014-07-01 20:45 ` Liviu Dudau 2014-07-01 20:45 ` Liviu Dudau 2014-07-02 12:30 ` Arnd Bergmann 2014-07-02 12:30 ` Arnd Bergmann 2014-07-02 14:23 ` Liviu Dudau 2014-07-02 14:23 ` Liviu Dudau 2014-07-02 14:23 ` Liviu Dudau 2014-07-02 14:23 ` Liviu Dudau 2014-07-02 14:58 ` Arnd Bergmann 2014-07-02 14:58 ` Arnd Bergmann 2014-07-02 14:58 ` Arnd Bergmann 2014-07-02 11:22 ` Will Deacon 2014-07-02 11:22 ` Will Deacon 2014-07-02 16:00 ` Liviu Dudau 2014-07-02 16:00 ` Liviu Dudau 2014-07-02 12:38 ` Arnd Bergmann [this message] 2014-07-02 12:38 ` Arnd Bergmann 2014-07-02 13:20 ` Liviu Dudau 2014-07-02 13:20 ` Liviu Dudau 2014-07-08 0:14 ` Bjorn Helgaas 2014-07-08 0:14 ` Bjorn Helgaas 2014-07-08 7:00 ` Arnd Bergmann 2014-07-08 7:00 ` Arnd Bergmann 2014-07-08 21:29 ` Bjorn Helgaas 2014-07-08 21:29 ` Bjorn Helgaas 2014-07-08 22:45 ` Liviu Dudau 2014-07-08 22:45 ` Liviu Dudau 2014-07-09 6:32 ` Arnd Bergmann 2014-07-09 6:32 ` Arnd Bergmann 2014-07-09 6:32 ` Arnd Bergmann 2014-07-09 9:13 ` Liviu Dudau 2014-07-09 9:13 ` Liviu Dudau 2014-07-09 6:20 ` Arnd Bergmann 2014-07-09 6:20 ` Arnd Bergmann 2014-07-09 9:14 ` Liviu Dudau 2014-07-09 9:14 ` Liviu Dudau 2014-07-09 15:21 ` Bjorn Helgaas 2014-07-09 15:21 ` Bjorn Helgaas 2014-07-08 10:40 ` Liviu Dudau 2014-07-08 10:40 ` Liviu Dudau 2014-07-08 14:14 ` Arnd Bergmann 2014-07-08 14:14 ` Arnd Bergmann 2014-07-09 8:59 ` Liviu Dudau 2014-07-09 8:59 ` Liviu Dudau 2014-07-01 18:43 ` [PATCH v8 4/9] pci: OF: Fix the conversion of IO ranges into IO resources Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-05 19:25 ` Rob Herring 2014-07-05 19:25 ` Rob Herring 2014-07-05 19:25 ` Rob Herring 2014-07-05 20:46 ` Arnd Bergmann 2014-07-05 20:46 ` Arnd Bergmann 2014-07-07 11:11 ` Liviu Dudau 2014-07-07 11:11 ` Liviu Dudau 2014-07-07 11:11 ` Liviu Dudau 2014-07-07 21:22 ` Arnd Bergmann 2014-07-07 21:22 ` Arnd Bergmann 2014-07-07 21:22 ` Arnd Bergmann 2014-07-08 10:03 ` Liviu Dudau 2014-07-08 10:03 ` Liviu Dudau 2014-07-08 10:03 ` Liviu Dudau 2014-07-09 8:31 ` Arnd Bergmann 2014-07-09 8:31 ` Arnd Bergmann 2014-07-09 8:31 ` Arnd Bergmann 2014-07-09 9:27 ` Liviu Dudau 2014-07-09 9:27 ` Liviu Dudau 2014-07-09 9:27 ` Liviu Dudau 2014-07-16 14:35 ` Rob Herring 2014-07-16 14:35 ` Rob Herring 2014-07-16 14:35 ` Rob Herring 2014-07-16 14:47 ` Liviu Dudau 2014-07-16 14:47 ` Liviu Dudau 2014-07-16 14:47 ` Liviu Dudau 2014-07-16 14:47 ` Arnd Bergmann 2014-07-16 14:47 ` Arnd Bergmann 2014-07-16 14:47 ` Arnd Bergmann 2014-07-01 18:43 ` [PATCH v8 5/9] pci: Create pci_host_bridge before its associated bus in pci_create_root_bus Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` [PATCH v8 6/9] pci: Introduce a domain number for pci_host_bridge Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-08 0:59 ` Bjorn Helgaas 2014-07-08 0:59 ` Bjorn Helgaas 2014-07-08 10:46 ` Liviu Dudau 2014-07-08 10:46 ` Liviu Dudau 2014-07-08 18:41 ` Bjorn Helgaas 2014-07-08 18:41 ` Bjorn Helgaas 2014-07-08 22:48 ` Liviu Dudau 2014-07-08 22:48 ` Liviu Dudau 2014-07-09 15:10 ` Bjorn Helgaas 2014-07-09 15:10 ` Bjorn Helgaas 2014-07-10 9:47 ` Liviu Dudau 2014-07-10 9:47 ` Liviu Dudau 2014-07-10 22:36 ` Bjorn Helgaas 2014-07-10 22:36 ` Bjorn Helgaas 2014-07-11 9:30 ` Liviu Dudau 2014-07-11 9:30 ` Liviu Dudau 2014-07-11 9:30 ` Liviu Dudau 2014-07-11 14:11 ` Catalin Marinas 2014-07-11 14:11 ` Catalin Marinas 2014-07-11 15:08 ` Liviu Dudau 2014-07-11 15:08 ` Liviu Dudau 2014-07-11 16:09 ` Catalin Marinas 2014-07-11 16:09 ` Catalin Marinas 2014-07-11 17:02 ` Bjorn Helgaas 2014-07-11 17:02 ` Bjorn Helgaas 2014-07-11 18:02 ` Catalin Marinas 2014-07-11 18:02 ` Catalin Marinas 2014-07-14 16:39 ` Catalin Marinas 2014-07-14 16:39 ` Catalin Marinas 2014-07-14 16:39 ` Catalin Marinas 2014-07-22 3:15 ` Bjorn Helgaas 2014-07-22 3:15 ` Bjorn Helgaas 2014-07-25 15:42 ` Catalin Marinas 2014-07-25 15:42 ` Catalin Marinas 2014-07-01 18:43 ` [PATCH v8 7/9] pci: of: Parse and map the IRQ when adding the PCI device Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-02 11:17 ` Will Deacon 2014-07-02 11:17 ` Will Deacon 2014-07-05 19:04 ` Rob Herring 2014-07-05 19:04 ` Rob Herring 2014-07-05 19:04 ` Rob Herring 2014-07-01 18:43 ` [PATCH v8 8/9] pci: Add support for creating a generic host_bridge from device tree Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-01 20:50 ` [RESEND] " Liviu Dudau 2014-07-01 20:50 ` Liviu Dudau 2014-07-01 20:50 ` Liviu Dudau 2014-07-01 21:04 ` Liviu Dudau 2014-07-01 21:04 ` Liviu Dudau 2014-07-01 21:04 ` Liviu Dudau 2014-07-02 11:22 ` Will Deacon 2014-07-02 11:22 ` Will Deacon 2014-07-02 17:23 ` Liviu Dudau 2014-07-02 17:23 ` Liviu Dudau 2014-07-02 17:23 ` Liviu Dudau 2014-07-02 17:31 ` Will Deacon 2014-07-02 17:31 ` Will Deacon 2014-07-02 19:09 ` Arnd Bergmann 2014-07-02 19:09 ` Arnd Bergmann 2014-07-08 1:01 ` Bjorn Helgaas 2014-07-08 1:01 ` Bjorn Helgaas 2014-07-08 10:29 ` Liviu Dudau 2014-07-08 10:29 ` Liviu Dudau 2014-07-08 21:33 ` Bjorn Helgaas 2014-07-08 21:33 ` Bjorn Helgaas 2014-07-08 22:27 ` Liviu Dudau 2014-07-08 22:27 ` Liviu Dudau 2014-07-08 22:37 ` Bjorn Helgaas 2014-07-08 22:37 ` Bjorn Helgaas 2014-07-08 22:37 ` Bjorn Helgaas 2014-07-08 22:57 ` Liviu Dudau 2014-07-08 22:57 ` Liviu Dudau 2014-07-09 6:47 ` Arnd Bergmann 2014-07-09 6:47 ` Arnd Bergmann 2014-07-11 7:43 ` Jingoo Han 2014-07-11 7:43 ` Jingoo Han 2014-07-11 9:08 ` Liviu Dudau 2014-07-11 9:08 ` Liviu Dudau 2014-07-01 18:43 ` [PATCH v8 9/9] pci: Remap I/O bus resources into CPU space with pci_remap_iospace() Liviu Dudau 2014-07-01 18:43 ` Liviu Dudau 2014-07-14 16:54 ` Catalin Marinas 2014-07-14 16:54 ` Catalin Marinas 2014-07-14 16:56 ` Liviu Dudau 2014-07-14 16:56 ` Liviu Dudau 2014-07-14 18:15 ` Arnd Bergmann 2014-07-14 18:15 ` Arnd Bergmann 2014-07-14 18:15 ` Arnd Bergmann 2014-07-15 0:14 ` Liviu Dudau 2014-07-15 0:14 ` Liviu Dudau 2014-07-15 0:14 ` Liviu Dudau 2014-07-15 9:09 ` Catalin Marinas 2014-07-15 9:09 ` Catalin Marinas 2014-07-15 9:09 ` Catalin Marinas 2014-07-06 15:23 ` [PATCH v8 0/9] Support for creating generic PCI host bridges from DT Rob Herring 2014-07-06 15:23 ` Rob Herring 2014-07-06 15:23 ` Rob Herring 2014-07-07 11:12 ` Liviu Dudau 2014-07-07 11:12 ` Liviu Dudau 2014-07-08 17:18 ` Liviu Dudau 2014-07-08 17:18 ` Liviu Dudau 2014-07-11 0:44 ` Tanmay Inamdar 2014-07-11 0:44 ` Tanmay Inamdar 2014-07-11 7:33 ` Jingoo Han 2014-07-11 7:33 ` Jingoo Han 2014-07-11 9:11 ` Liviu Dudau 2014-07-11 9:11 ` Liviu Dudau
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