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Date: Fri, 3 Apr 2015 14:32:34 -0500
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Yinghai Lu <yinghai@...nel.org>
Cc: David Miller <davem@...emloft.net>,
David Ahern <david.ahern@...cle.com>,
linux-pci@...r.kernel.org, sparclinux@...r.kernel.org,
linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/3] PCI: Introduce pci_bus_addr_t
On Tue, Mar 31, 2015 at 07:57:47PM -0700, Yinghai Lu wrote:
> David Ahern found commit d63e2e1f3df9 ("sparc/PCI: Clip bridge windows
> to fit in upstream windows") broke booting on sparc/T5-8.
>
> In the boot log, there is
> pci 0000:06:00.0: reg 0x184: can't handle BAR above 4GB (bus address
> 0x110204000)
> but that only could happen when dma_addr_t is 32-bit.
>
> According to David Miller, all DMA occurs behind an IOMMU and these
> IOMMUs only support 32-bit addressing, therefore dma_addr_t is
> 32-bit on sparc64.
>
> Let's introduce pci_bus_addr_t instead of using dma_addr_t,
> and pci_bus_addr_t will be 64-bit on 64-bit platform or X86_PAE.
>
> Fixes: commit d63e2e1f3df9 ("sparc/PCI: Clip bridge windows to fit in upstream windows")
> Fixes: commit 23b13bc76f35 ("PCI: Fail safely if we can't handle BARs larger than 4GB")
> Link: http://lkml.kernel.org/r/CAE9FiQU1gJY1LYrxs+ma5LCTEEe4xmtjRG0aXJ9K_Tsu+m9Wuw@mail.gmail.com
> Reported-by: David Ahern <david.ahern@...cle.com>
> Tested-by: David Ahern <david.ahern@...cle.com>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: <stable@...r.kernel.org> #3.19
> ---
> drivers/pci/Kconfig | 4 ++++
> drivers/pci/bus.c | 10 +++++-----
> drivers/pci/probe.c | 12 ++++++------
> include/linux/pci.h | 12 +++++++++---
> 4 files changed, 24 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> index 7a8f1c5..6a5a269 100644
> --- a/drivers/pci/Kconfig
> +++ b/drivers/pci/Kconfig
> @@ -1,6 +1,10 @@
> #
> # PCI configuration
> #
> +config PCI_BUS_ADDR_T_64BIT
> + def_bool y if (64BIT || X86_PAE)
> + depends on PCI
We're going to use pci_bus_addr_t in some places where we previously used
dma_addr_t, which means pci_bus_addr_t should be at least as large as
dma_addr_t. Can you enforce that directly, e.g., with something like this?
def_bool y if (ARCH_DMA_ADDR_T_64BIT || 64BIT || X86_PAE)
Unless we do something like that, I think this may break these arches by
changing the addresses in struct pci_bus_region from 64 bits to 32:
arch/arm/Kconfig:
XEN selects ARCH_DMA_ADDR_T_64BIT but not 64BIT, so it would not
set PCI_BUS_ADDR_T_64BIT
arch/arm/mach-axxia/Kconfig:
ARCH_AXXIA selects ARCH_DMA_ADDR_T_64BIT but not 64BIT, so it
would not set PCI_BUS_ADDR_T_64BIT
arch/arm/mach-exynos/Kconfig:
SOC_EXYNOS5440 selects ARCH_DMA_ADDR_T_64BIT if ARM_LPAE, but not
64BIT, so it would not set PCI_BUS_ADDR_T_64BIT
arch/arm/mach-highbank/Kconfig:
ARCH_HIGHBANK selects ARCH_DMA_ADDR_T_64BIT if ARM_LPAE, but not
64BIT, so it would not set PCI_BUS_ADDR_T_64BIT
arch/arm/mach-shmobile/Kconfig:
ARCH_SHMOBILE_MULTI selects ARCH_DMA_ADDR_T_64BIT if ARM_LPAE, but
not 64BIT, so it would not set PCI_BUS_ADDR_T_64BIT
arch/mips/Kconfig:
sets ARCH_DMA_ADDR_T_64BIT if (HIGHMEM && ARCH_PHYS_ADDR_T_64BIT)
|| 64BIT, so if we have (HIGHMEM && ARCH_PHYS_ADDR_T_64BIT) but not
64BIT, it would not set PCI_BUS_ADDR_T_64BIT
arch/powerpc/Kconfig:
sets ARCH_DMA_ADDR_T_64BIT if ARCH_PHYS_ADDR_T_64BIT, which isn't
trivially identical to (64BIT || X86_PAE), so we may not set
PCI_BUS_ADDR_T_64BIT in all cases where we set
ARCH_DMA_ADDR_T_64BIT
arch/x86/Kconfig:
sets ARCH_DMA_ADDR_T_64BIT if X86_64 || HIGHMEM64G, which isn't
trivially identical to (64BIT || X86_PAE), so we may not set
PCI_BUS_ADDR_T_64BIT in all cases where we set
ARCH_DMA_ADDR_T_64BIT
> config PCI_MSI
> bool "Message Signaled Interrupts (MSI and MSI-X)"
> depends on PCI
> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
> index 90fa3a7..6fbd3f2 100644
> --- a/drivers/pci/bus.c
> +++ b/drivers/pci/bus.c
> @@ -92,11 +92,11 @@ void pci_bus_remove_resources(struct pci_bus *bus)
> }
>
> static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
> -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
> +#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
> static struct pci_bus_region pci_64_bit = {0,
> - (dma_addr_t) 0xffffffffffffffffULL};
> -static struct pci_bus_region pci_high = {(dma_addr_t) 0x100000000ULL,
> - (dma_addr_t) 0xffffffffffffffffULL};
> + (pci_bus_addr_t) 0xffffffffffffffffULL};
> +static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
> + (pci_bus_addr_t) 0xffffffffffffffffULL};
> #endif
>
> /*
> @@ -200,7 +200,7 @@ int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
> resource_size_t),
> void *alignf_data)
> {
> -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
> +#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
> int rc;
>
> if (res->flags & IORESOURCE_MEM_64) {
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 8d2f400..f71cb7c 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -253,8 +253,8 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
> }
>
> if (res->flags & IORESOURCE_MEM_64) {
> - if ((sizeof(dma_addr_t) < 8 || sizeof(resource_size_t) < 8) &&
> - sz64 > 0x100000000ULL) {
> + if ((sizeof(pci_bus_addr_t) < 8 || sizeof(resource_size_t) < 8)
> + && sz64 > 0x100000000ULL) {
> res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
> res->start = 0;
> res->end = 0;
> @@ -263,7 +263,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
> goto out;
> }
>
> - if ((sizeof(dma_addr_t) < 8) && l) {
> + if ((sizeof(pci_bus_addr_t) < 8) && l) {
> /* Above 32-bit boundary; try to reallocate */
> res->flags |= IORESOURCE_UNSET;
> res->start = 0;
> @@ -398,7 +398,7 @@ static void pci_read_bridge_mmio_pref(struct pci_bus *child)
> struct pci_dev *dev = child->self;
> u16 mem_base_lo, mem_limit_lo;
> u64 base64, limit64;
> - dma_addr_t base, limit;
> + pci_bus_addr_t base, limit;
> struct pci_bus_region region;
> struct resource *res;
>
> @@ -425,8 +425,8 @@ static void pci_read_bridge_mmio_pref(struct pci_bus *child)
> }
> }
>
> - base = (dma_addr_t) base64;
> - limit = (dma_addr_t) limit64;
> + base = (pci_bus_addr_t) base64;
> + limit = (pci_bus_addr_t) limit64;
>
> if (base != base64) {
> dev_err(&dev->dev, "can't handle bridge window above 4GB (bus address %#010llx)\n",
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 211e9da..6021bbe 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -573,9 +573,15 @@ int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
> int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
> int reg, int len, u32 val);
>
> +#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
> +typedef u64 pci_bus_addr_t;
> +#else
> +typedef u32 pci_bus_addr_t;
> +#endif
> +
> struct pci_bus_region {
> - dma_addr_t start;
> - dma_addr_t end;
> + pci_bus_addr_t start;
> + pci_bus_addr_t end;
> };
>
> struct pci_dynids {
> @@ -1124,7 +1130,7 @@ int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
>
> int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);
>
> -static inline dma_addr_t pci_bus_address(struct pci_dev *pdev, int bar)
> +static inline pci_bus_addr_t pci_bus_address(struct pci_dev *pdev, int bar)
> {
> struct pci_bus_region region;
>
> --
> 1.8.4.5
>
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