The following patch is maybe a better solution Gab ----------------------- This patch is needed in order to unify the PCIe designware framework for ARM and ARM64 architectures. In the PCIe designware unification process we are calling pci_create_root_bus() passing a "sysdata" parameter that is the same for both ARM and ARM64 and is of type "struct pcie_port*". In the ARM case this will cause a problem with the function pcibios_align_resource(); in fact this will cast "dev->sysdata" to "struct pci_sys_data*", whereas designware had passed a "struct pcie_port*" pointer. This patch solves the issue by removing "align_resource" from "pci_sys_data" struct and defining a static global function pointer in "bios32.c" Signed-off-by: Gabriele Paoloni <gabriele.paoloni at huawei.com> --- arch/arm/include/asm/mach/pci.h | 5 ----- arch/arm/kernel/bios32.c | 12 ++++++++---- 2 files changed, 8 insertions(+), 9 deletions(-) diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h index 28b9bb3..8a4e4de 100644 --- a/arch/arm/include/asm/mach/pci.h +++ b/arch/arm/include/asm/mach/pci.h @@ -58,11 +58,6 @@ struct pci_sys_data { /* IRQ mapping */ int (*map_irq)(const struct pci_dev *, u8, u8); /* Resource alignement requirements */ - resource_size_t (*align_resource)(struct pci_dev *dev, - const struct resource *res, - resource_size_t start, - resource_size_t size, - resource_size_t align); void *private_data; /* platform controller private data */ }; diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c index fcbbbb1..4cdc64d 100644 --- a/arch/arm/kernel/bios32.c +++ b/arch/arm/kernel/bios32.c @@ -17,6 +17,11 @@ #include <asm/mach/pci.h> static int debug_pci; +static resource_size_t (*align_resource)(struct pci_dev *dev, + const struct resource *res, + resource_size_t start, + resource_size_t size, + resource_size_t align) = NULL; #ifdef CONFIG_PCI_MSI struct msi_controller *pcibios_msi_controller(struct pci_dev *dev) @@ -468,7 +473,7 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, sys->busnr = busnr; sys->swizzle = hw->swizzle; sys->map_irq = hw->map_irq; - sys->align_resource = hw->align_resource; + align_resource = hw->align_resource; INIT_LIST_HEAD(&sys->resources); if (hw->private_data) @@ -589,7 +594,6 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res, resource_size_t size, resource_size_t align) { struct pci_dev *dev = data; - struct pci_sys_data *sys = dev->sysdata; resource_size_t start = res->start; if (res->flags & IORESOURCE_IO && start & 0x300) @@ -597,8 +601,8 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res, start = (start + align - 1) & ~(align - 1); - if (sys->align_resource) - return sys->align_resource(dev, res, start, size, align); + if (align_resource) + return align_resource(dev, res, start, size, align); return start; } -- 1.9.1 > -----Original Message----- > From: linux-pci-owner@xxxxxxxxxxxxxxx [mailto:linux-pci- > owner@xxxxxxxxxxxxxxx] On Behalf Of Liviu Dudau > Sent: Tuesday, July 07, 2015 10:22 AM > To: Wangzhou (B) > Cc: Bjorn Helgaas; Jingoo Han; Pratyush Anand; Arnd Bergmann; Gabriele > Paoloni; James Morse; linux-pci@xxxxxxxxxxxxxxx; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; Yuanzhichang; > Zhudacai; zhangjukuo; qiuzhenfa; Liguozhu (Kenneth) > Subject: Re: [PATCH v3 1/5] ARM/PCI: remove align_resource callback in > pcibios_align_resource > > On Tue, Jul 07, 2015 at 06:44:01AM +0100, Zhou Wang wrote: > > On 2015/7/3 1:50, Liviu Dudau wrote: > > > On Wed, Jul 01, 2015 at 10:43:33AM +0100, Zhou Wang wrote: > > >> This patch had added by Arnd Bergmann during last reviewing of v1 > patchset[1]. > > >> > > >> PCI core codes call pcibios_align_resource(). In ARM specific one, > it will > > >> dereference pci_sys_data and call sys->align_resource. If we try > to unify ARM > > >> and ARM64 PCIe API in pcie-designware. it will bring kernel crash > when run into > > >> this dereferencing. > > >> > > >> However, in ARM there is only pci-mvebu which implements > align_resource. So > > >> add align_resource call back in pci_host_bridge structure and > override > > >> pcibios_align_resource with it. > > >> > > >> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> > > >> Signed-off-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx> > > >> Tested-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx> > > >> > > >> [1] http://www.spinics.net/lists/linux-pci/msg41671.html > > >> --- > > >> arch/arm/kernel/bios32.c | 6 ------ > > >> drivers/pci/host/pci-mvebu.c | 47 ++++++++++++++++++++++++++++--- > ------------- > > >> drivers/pci/setup-res.c | 27 ++++++++++++++++++++----- > > >> include/linux/pci.h | 3 +++ > > >> 4 files changed, 55 insertions(+), 28 deletions(-) > > >> > > >> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c > > >> index fcbbbb1..b01189f 100644 > > >> --- a/arch/arm/kernel/bios32.c > > >> +++ b/arch/arm/kernel/bios32.c > > >> @@ -468,7 +468,6 @@ static void pcibios_init_hw(struct device > *parent, struct hw_pci *hw, > > >> sys->busnr = busnr; > > >> sys->swizzle = hw->swizzle; > > >> sys->map_irq = hw->map_irq; > > >> - sys->align_resource = hw->align_resource; > > >> INIT_LIST_HEAD(&sys->resources); > > >> > > >> if (hw->private_data) > > >> @@ -588,8 +587,6 @@ char * __init pcibios_setup(char *str) > > >> resource_size_t pcibios_align_resource(void *data, const struct > resource *res, > > >> resource_size_t size, resource_size_t > align) > > >> { > > >> - struct pci_dev *dev = data; > > >> - struct pci_sys_data *sys = dev->sysdata; > > >> resource_size_t start = res->start; > > >> > > >> if (res->flags & IORESOURCE_IO && start & 0x300) > > >> @@ -597,9 +594,6 @@ resource_size_t pcibios_align_resource(void > *data, const struct resource *res, > > >> > > >> start = (start + align - 1) & ~(align - 1); > > >> > > >> - if (sys->align_resource) > > >> - return sys->align_resource(dev, res, start, size, > align); > > >> - > > >> return start; > > >> } > > >> > > >> diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci- > mvebu.c > > >> index 1ab8635..155d05f 100644 > > >> --- a/drivers/pci/host/pci-mvebu.c > > >> +++ b/drivers/pci/host/pci-mvebu.c > > >> @@ -22,6 +22,8 @@ > > >> #include <linux/of_pci.h> > > >> #include <linux/of_platform.h> > > >> > > >> +#include "../pci.h" /* HACK to see pci_find_host_bridge */ > > >> + > > >> /* > > >> * PCIe unit register offsets. > > >> */ > > >> @@ -751,27 +753,20 @@ static int mvebu_pcie_setup(int nr, struct > pci_sys_data *sys) > > >> return 1; > > >> } > > >> > > >> -static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct > pci_sys_data *sys) > > >> +static resource_size_t mvebu_pcie_align_resource(void *data, > > >> + const struct resource *res, > > >> + resource_size_t size, > > >> + resource_size_t align) > > >> { > > >> - struct mvebu_pcie *pcie = sys_to_pcie(sys); > > >> - struct pci_bus *bus; > > >> + struct pci_dev *dev = data; > > >> > > >> - bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr, > > >> - &mvebu_pcie_ops, sys, &sys->resources); > > >> - if (!bus) > > >> - return NULL; > > >> + resource_size_t start = res->start; > > >> > > >> - pci_scan_child_bus(bus); > > >> + if (res->flags & IORESOURCE_IO && start & 0x300) > > >> + start = (start + 0x3ff) & ~0x3ff; > > >> > > >> - return bus; > > >> -} > > >> + start = (start + align - 1) & ~(align - 1); > > > > > > Honestly, I don't see here anything that is mvebu specific. Could > you move > > > > What I mean is that there is only mvebu who implemented sys- > >align_resource callback in ARM > > arch. > > > > > this function in the generic pci/host area and have a flag in the > pci_host_bridge > > > structure whether the function should be called or not? I know that > in a way > > > that looks very close to the existing implementation which uses > pcibios_align_resource, > > > > I am confused about "the existing implementation". Now > pcibios_align_resource are > > implemented by each arch code and are called directly. Did I miss > anything about > > pcibios_align_resource? > > Sorry, I meant existing implementation_s_ and yes, I was reffering to > the arch specific > code. If you look at the cris, frv/mb93090-mb00, m68k, microblaze, > powerpc, unicore32 > and x86 they all share the code with your version, plus or minus > additional checks. > I was thinking that for those arch versions that match your version you > can create just > one version and use it as the alignf function. > > Best regards, > Liviu > > > > > Best rgards, > > Zhou > > > > > but the problem with pcibios_ version is that it is arch specific > and not driver > > > specific the way we want. > > > > > > Having this version as a generic implementation would also remove > at least 2 more > > > arch version, possibly more after testing by the arch maintainers. > > > > > > Best regards, > > > Liviu > > > > > >> > > >> -static resource_size_t mvebu_pcie_align_resource(struct pci_dev > *dev, > > >> - const struct resource *res, > > >> - resource_size_t start, > > >> - resource_size_t size, > > >> - resource_size_t align) > > >> -{ > > >> if (dev->bus->number != 0) > > >> return start; > > >> > > >> @@ -796,6 +791,25 @@ static resource_size_t > mvebu_pcie_align_resource(struct pci_dev *dev, > > >> return start; > > >> } > > >> > > >> +static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct > pci_sys_data *sys) > > >> +{ > > >> + struct mvebu_pcie *pcie = sys_to_pcie(sys); > > >> + struct pci_host_bridge *phb; > > >> + struct pci_bus *bus; > > >> + > > >> + bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr, > > >> + &mvebu_pcie_ops, sys, &sys->resources); > > >> + if (!bus) > > >> + return NULL; > > >> + > > >> + phb = pci_find_host_bridge(bus); > > >> + phb->align_resource = mvebu_pcie_align_resource; > > >> + > > >> + pci_scan_child_bus(bus); > > >> + > > >> + return bus; > > >> +} > > >> + > > >> static void mvebu_pcie_enable(struct mvebu_pcie *pcie) > > >> { > > >> struct hw_pci hw; > > >> @@ -812,7 +826,6 @@ static void mvebu_pcie_enable(struct > mvebu_pcie *pcie) > > >> hw.scan = mvebu_pcie_scan_bus; > > >> hw.map_irq = of_irq_parse_and_map_pci; > > >> hw.ops = &mvebu_pcie_ops; > > >> - hw.align_resource = mvebu_pcie_align_resource; > > >> > > >> pci_common_init(&hw); > > >> } > > >> diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c > > >> index 232f925..73abca7 100644 > > >> --- a/drivers/pci/setup-res.c > > >> +++ b/drivers/pci/setup-res.c > > >> @@ -200,7 +200,11 @@ static int pci_revert_fw_address(struct > resource *res, struct pci_dev *dev, > > >> } > > >> > > >> static int __pci_assign_resource(struct pci_bus *bus, struct > pci_dev *dev, > > >> - int resno, resource_size_t size, resource_size_t > align) > > >> + int resno, resource_size_t size, resource_size_t > align, > > >> + resource_size_t (*alignf)(void *, > > >> + const struct resource *, > > >> + resource_size_t, > > >> + resource_size_t)) > > >> { > > >> struct resource *res = dev->resource + resno; > > >> resource_size_t min; > > >> @@ -217,7 +221,7 @@ static int __pci_assign_resource(struct > pci_bus *bus, struct pci_dev *dev, > > >> */ > > >> ret = pci_bus_alloc_resource(bus, res, size, align, min, > > >> IORESOURCE_PREFETCH | > IORESOURCE_MEM_64, > > >> - pcibios_align_resource, dev); > > >> + alignf, dev); > > >> if (ret == 0) > > >> return 0; > > >> > > >> @@ -229,7 +233,7 @@ static int __pci_assign_resource(struct > pci_bus *bus, struct pci_dev *dev, > > >> (IORESOURCE_PREFETCH | IORESOURCE_MEM_64)) { > > >> ret = pci_bus_alloc_resource(bus, res, size, align, > min, > > >> IORESOURCE_PREFETCH, > > >> - pcibios_align_resource, dev); > > >> + alignf, dev); > > >> if (ret == 0) > > >> return 0; > > >> } > > >> @@ -242,7 +246,7 @@ static int __pci_assign_resource(struct > pci_bus *bus, struct pci_dev *dev, > > >> */ > > >> if (res->flags & (IORESOURCE_PREFETCH | IORESOURCE_MEM_64)) > > >> ret = pci_bus_alloc_resource(bus, res, size, align, > min, 0, > > >> - pcibios_align_resource, dev); > > >> + alignf, dev); > > >> > > >> return ret; > > >> } > > >> @@ -251,10 +255,23 @@ static int _pci_assign_resource(struct > pci_dev *dev, int resno, > > >> resource_size_t size, resource_size_t > min_align) > > >> { > > >> struct pci_bus *bus; > > >> + struct pci_host_bridge *phb; > > >> + resource_size_t (*alignf)(void *, > > >> + const struct resource *, > > >> + resource_size_t, > > >> + resource_size_t); > > >> int ret; > > >> > > >> bus = dev->bus; > > >> - while ((ret = __pci_assign_resource(bus, dev, resno, size, > min_align))) { > > >> + phb = pci_find_host_bridge(bus); > > >> + > > >> + if (phb->align_resource) > > >> + alignf = phb->align_resource; > > >> + else > > >> + alignf = pcibios_align_resource; > > >> + > > >> + while ((ret = __pci_assign_resource(bus, dev, resno, size, > > >> + min_align, alignf))) { > > >> if (!bus->parent || !bus->self->transparent) > > >> break; > > >> bus = bus->parent; > > >> diff --git a/include/linux/pci.h b/include/linux/pci.h > > >> index 353db8d..39e48fc 100644 > > >> --- a/include/linux/pci.h > > >> +++ b/include/linux/pci.h > > >> @@ -404,6 +404,9 @@ struct pci_host_bridge { > > >> struct device dev; > > >> struct pci_bus *bus; /* root bus */ > > >> struct list_head windows; /* resource_entry */ > > >> + resource_size_t (*align_resource)(void *data, > > >> + const struct resource *res, > > >> + resource_size_t size, resource_size_t align); > > >> void (*release_fn)(struct pci_host_bridge *); > > >> void *release_data; > > >> unsigned int ignore_reset_delay:1; /* for entire hierarchy > */ > > >> -- > > >> 1.9.1 > > >> > > > > > > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-pci" > in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- > ==================== > | I would like to | > | fix the world, | > | but they're not | > | giving me the | > \ source code! / > --------------- > ¯\_(ツ)_/¯ > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html ��.n��������+%������w��{.n����z�{��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f