From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> To: linux-pci@vger.kernel.org Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>, Bjorn Helgaas <bhelgaas@google.com>, Guan Xuetao <gxt@mprc.pku.edu.cn> Subject: [PATCH v3 26/32] unicore32: include default ioremap_nopost() implementation Date: Tue, 11 Apr 2017 13:29:06 +0100 [thread overview] Message-ID: <20170411122923.6285-27-lorenzo.pieralisi@arm.com> (raw) In-Reply-To: <20170411122923.6285-1-lorenzo.pieralisi@arm.com> The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and Posting") mandate non-posted configuration transactions. As further highlighted in the PCIe specifications (4.0 - Rev0.3, "Ordering Considerations for the Enhanced Configuration Access Mechanism"), through ECAM and ECAM-derivative configuration mechanism, the memory mapped transactions from the host CPU into Configuration Requests on the PCI express fabric may create ordering problems for software because writes to memory address are typically posted transactions (unless the architecture can enforce through virtual address mapping non-posted write transactions behaviour) but writes to Configuration Space are not posted on the PCI express fabric. Include the asm-generic ioremap_nopost() implementation (currently falling back to ioremap_nocache()) to provide a non-posted writes ioremap interface to kernel subsystems. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> --- arch/unicore32/include/asm/io.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/unicore32/include/asm/io.h b/arch/unicore32/include/asm/io.h index cb1d8fd..71fdfa2 100644 --- a/arch/unicore32/include/asm/io.h +++ b/arch/unicore32/include/asm/io.h @@ -38,6 +38,7 @@ extern void __uc32_iounmap(volatile void __iomem *addr); #define ioremap_cached(cookie, size) __uc32_ioremap_cached(cookie, size) #define ioremap_nocache(cookie, size) __uc32_ioremap(cookie, size) #define iounmap(cookie) __uc32_iounmap(cookie) +#include <asm-generic/ioremap-nopost.h> #define readb_relaxed readb #define readw_relaxed readw -- 2.10.0
WARNING: multiple messages have this Message-ID (diff)
From: lorenzo.pieralisi@arm.com (Lorenzo Pieralisi) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 26/32] unicore32: include default ioremap_nopost() implementation Date: Tue, 11 Apr 2017 13:29:06 +0100 [thread overview] Message-ID: <20170411122923.6285-27-lorenzo.pieralisi@arm.com> (raw) In-Reply-To: <20170411122923.6285-1-lorenzo.pieralisi@arm.com> The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and Posting") mandate non-posted configuration transactions. As further highlighted in the PCIe specifications (4.0 - Rev0.3, "Ordering Considerations for the Enhanced Configuration Access Mechanism"), through ECAM and ECAM-derivative configuration mechanism, the memory mapped transactions from the host CPU into Configuration Requests on the PCI express fabric may create ordering problems for software because writes to memory address are typically posted transactions (unless the architecture can enforce through virtual address mapping non-posted write transactions behaviour) but writes to Configuration Space are not posted on the PCI express fabric. Include the asm-generic ioremap_nopost() implementation (currently falling back to ioremap_nocache()) to provide a non-posted writes ioremap interface to kernel subsystems. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> --- arch/unicore32/include/asm/io.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/unicore32/include/asm/io.h b/arch/unicore32/include/asm/io.h index cb1d8fd..71fdfa2 100644 --- a/arch/unicore32/include/asm/io.h +++ b/arch/unicore32/include/asm/io.h @@ -38,6 +38,7 @@ extern void __uc32_iounmap(volatile void __iomem *addr); #define ioremap_cached(cookie, size) __uc32_ioremap_cached(cookie, size) #define ioremap_nocache(cookie, size) __uc32_ioremap(cookie, size) #define iounmap(cookie) __uc32_iounmap(cookie) +#include <asm-generic/ioremap-nopost.h> #define readb_relaxed readb #define readw_relaxed readw -- 2.10.0
next prev parent reply other threads:[~2017-04-11 12:30 UTC|newest] Thread overview: 171+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-11 12:28 [PATCH v3 00/32] PCI: fix config and I/O Address space memory mappings Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 01/32] PCI: remove __weak tag from pci_remap_iospace() Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 02/32] asm-generic/pgtable.h: introduce pgprot_nonposted remap attribute Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 03/32] PCI: fix pci_remap_iospace() " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 04/32] asm-generic: add ioremap_nopost() remap interface Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 13:39 ` Benjamin Herrenschmidt 2017-04-11 13:39 ` Benjamin Herrenschmidt 2017-04-11 13:39 ` Benjamin Herrenschmidt 2017-04-11 14:31 ` Lorenzo Pieralisi 2017-04-11 14:31 ` Lorenzo Pieralisi 2017-04-11 14:31 ` Lorenzo Pieralisi 2017-04-11 23:14 ` Benjamin Herrenschmidt 2017-04-11 23:14 ` Benjamin Herrenschmidt 2017-04-11 23:14 ` Benjamin Herrenschmidt 2017-04-12 10:00 ` Lorenzo Pieralisi 2017-04-12 10:00 ` Lorenzo Pieralisi 2017-04-12 10:00 ` Lorenzo Pieralisi 2017-04-12 11:20 ` Russell King - ARM Linux 2017-04-12 11:20 ` Russell King - ARM Linux 2017-04-12 11:20 ` Russell King - ARM Linux 2017-04-18 15:49 ` Lorenzo Pieralisi 2017-04-18 15:49 ` Lorenzo Pieralisi 2017-04-18 15:49 ` Lorenzo Pieralisi 2017-04-18 16:31 ` Bjorn Helgaas 2017-04-18 16:31 ` Bjorn Helgaas 2017-04-18 16:31 ` Bjorn Helgaas 2017-04-18 22:43 ` Benjamin Herrenschmidt 2017-04-18 22:43 ` Benjamin Herrenschmidt 2017-04-18 22:43 ` Benjamin Herrenschmidt 2017-04-11 12:28 ` [PATCH v3 05/32] alpha: include default ioremap_nopost() implementation Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 06/32] avr32: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 13:55 ` Nicolas Ferre 2017-04-11 13:55 ` Nicolas Ferre 2017-04-11 13:55 ` Nicolas Ferre 2017-04-11 13:55 ` Nicolas Ferre 2017-04-11 12:28 ` [PATCH v3 07/32] arc: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 08/32] cris: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 13:15 ` Jesper Nilsson 2017-04-11 13:15 ` Jesper Nilsson 2017-04-11 13:15 ` Jesper Nilsson 2017-04-11 12:28 ` [PATCH v3 09/32] frv: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 10/32] hexagon: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 11/32] ia64: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 12/32] m32r: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 13/32] m68k: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 14/32] metag: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 15/32] microblaze: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 16/32] mips: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 17/32] mn10300: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 18/32] nios2: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:28 ` [PATCH v3 19/32] openrisc: " Lorenzo Pieralisi 2017-04-11 12:28 ` Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 20/32] parisc: " Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 21/32] powerpc: " Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 13:38 ` Benjamin Herrenschmidt 2017-04-11 13:38 ` Benjamin Herrenschmidt 2017-04-11 13:38 ` Benjamin Herrenschmidt 2017-04-11 13:38 ` Benjamin Herrenschmidt 2017-04-11 14:24 ` Lorenzo Pieralisi 2017-04-11 14:24 ` Lorenzo Pieralisi 2017-04-11 14:24 ` Lorenzo Pieralisi 2017-04-11 23:15 ` Benjamin Herrenschmidt 2017-04-11 23:15 ` Benjamin Herrenschmidt 2017-04-11 23:15 ` Benjamin Herrenschmidt 2017-04-11 23:15 ` Benjamin Herrenschmidt 2017-04-13 3:35 ` Michael Ellerman 2017-04-13 3:35 ` Michael Ellerman 2017-04-11 12:29 ` [PATCH v3 22/32] s390: " Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 23/32] sh: " Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 24/32] sparc: " Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 25/32] tile: " Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi [this message] 2017-04-11 12:29 ` [PATCH v3 26/32] unicore32: " Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 27/32] x86: " Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 28/32] xtensa: " Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 29/32] arm64: implement ioremap_nopost() interface Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 30/32] arm: " Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 31/32] lib: fix Devres devm_ioremap_* offset parameter kerneldoc description Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` [PATCH v3 32/32] lib: implement Devres ioremap_nopost() interface Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 12:29 ` Lorenzo Pieralisi 2017-04-11 13:38 ` [PATCH v3 00/32] PCI: fix config and I/O Address space memory mappings Benjamin Herrenschmidt 2017-04-11 13:38 ` Benjamin Herrenschmidt 2017-04-11 13:38 ` Benjamin Herrenschmidt 2017-04-11 14:08 ` Lorenzo Pieralisi 2017-04-11 14:08 ` Lorenzo Pieralisi 2017-04-11 14:08 ` Lorenzo Pieralisi 2017-04-11 23:12 ` Benjamin Herrenschmidt 2017-04-11 23:12 ` Benjamin Herrenschmidt 2017-04-11 23:12 ` Benjamin Herrenschmidt 2017-04-12 9:44 ` Lorenzo Pieralisi 2017-04-12 9:44 ` Lorenzo Pieralisi 2017-04-12 9:44 ` Lorenzo Pieralisi 2017-04-12 13:48 ` Benjamin Herrenschmidt 2017-04-12 13:48 ` Benjamin Herrenschmidt 2017-04-12 13:48 ` Benjamin Herrenschmidt 2017-04-12 11:31 ` Russell King - ARM Linux 2017-04-12 11:31 ` Russell King - ARM Linux 2017-04-12 11:31 ` Russell King - ARM Linux 2017-04-12 13:51 ` Benjamin Herrenschmidt 2017-04-12 13:51 ` Benjamin Herrenschmidt 2017-04-12 13:51 ` Benjamin Herrenschmidt 2017-04-12 14:16 ` Russell King - ARM Linux 2017-04-12 14:16 ` Russell King - ARM Linux 2017-04-12 14:16 ` Russell King - ARM Linux 2017-04-12 14:41 ` Lorenzo Pieralisi 2017-04-12 14:41 ` Lorenzo Pieralisi 2017-04-12 14:41 ` Lorenzo Pieralisi 2017-04-12 22:30 ` Benjamin Herrenschmidt 2017-04-12 22:30 ` Benjamin Herrenschmidt 2017-04-12 22:30 ` Benjamin Herrenschmidt 2017-04-12 22:45 ` Russell King - ARM Linux 2017-04-12 22:45 ` Russell King - ARM Linux 2017-04-12 22:45 ` Russell King - ARM Linux 2017-04-13 0:53 ` Benjamin Herrenschmidt 2017-04-13 0:53 ` Benjamin Herrenschmidt 2017-04-13 0:53 ` Benjamin Herrenschmidt 2017-04-18 8:57 ` Lorenzo Pieralisi 2017-04-18 8:57 ` Lorenzo Pieralisi 2017-04-18 8:57 ` Lorenzo Pieralisi 2017-04-18 10:36 ` Benjamin Herrenschmidt 2017-04-18 10:36 ` Benjamin Herrenschmidt 2017-04-18 10:36 ` Benjamin Herrenschmidt 2017-04-18 11:03 ` Lorenzo Pieralisi 2017-04-18 11:03 ` Lorenzo Pieralisi 2017-04-18 11:03 ` Lorenzo Pieralisi 2017-04-18 22:38 ` Benjamin Herrenschmidt 2017-04-18 22:38 ` Benjamin Herrenschmidt 2017-04-18 22:38 ` Benjamin Herrenschmidt
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