From: Naveen Naidu <naveennaidu479@gmail.com> To: bhelgaas@google.com Cc: "Naveen Naidu" <naveennaidu479@gmail.com>, linux-kernel-mentees@lists.linuxfoundation.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, "Joyce Ooi" <joyce.ooi@intel.com>, "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>, "Rob Herring" <robh@kernel.org>, "Krzysztof Wilczyński" <kw@linux.com> Subject: [PATCH 11/22] PCI: altera: Use SET_PCI_ERROR_RESPONSE() when device not found Date: Mon, 11 Oct 2021 23:30:49 +0530 [thread overview] Message-ID: <8e70c0f96b25e4b30ce4fc261cafe038a025429c.1633972263.git.naveennaidu479@gmail.com> (raw) In-Reply-To: <cover.1633972263.git.naveennaidu479@gmail.com> An MMIO read from a PCI device that doesn't exist or doesn't respond causes a PCI error. There's no real data to return to satisfy the CPU read, so most hardware fabricates ~0 data. Use SET_PCI_ERROR_RESPONSE() to set the error response, when a faulty read occurs. This helps unify PCI error response checking and make error check consistent and easier to find. Compile tested only. Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com> --- drivers/pci/controller/pcie-altera.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c index 2513e9363236..d6c71b5d1ffb 100644 --- a/drivers/pci/controller/pcie-altera.c +++ b/drivers/pci/controller/pcie-altera.c @@ -511,7 +511,7 @@ static int altera_pcie_cfg_read(struct pci_bus *bus, unsigned int devfn, return PCIBIOS_BAD_REGISTER_NUMBER; if (!altera_pcie_valid_device(pcie, bus, PCI_SLOT(devfn))) { - *value = 0xffffffff; + SET_PCI_ERROR_RESPONSE(value); return PCIBIOS_DEVICE_NOT_FOUND; } -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Naveen Naidu <naveennaidu479@gmail.com> To: bhelgaas@google.com Cc: "Rob Herring" <robh@kernel.org>, "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>, "Krzysztof Wilczyński" <kw@linux.com>, "Joyce Ooi" <joyce.ooi@intel.com>, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org Subject: [PATCH 11/22] PCI: altera: Use SET_PCI_ERROR_RESPONSE() when device not found Date: Mon, 11 Oct 2021 23:30:49 +0530 [thread overview] Message-ID: <8e70c0f96b25e4b30ce4fc261cafe038a025429c.1633972263.git.naveennaidu479@gmail.com> (raw) In-Reply-To: <cover.1633972263.git.naveennaidu479@gmail.com> An MMIO read from a PCI device that doesn't exist or doesn't respond causes a PCI error. There's no real data to return to satisfy the CPU read, so most hardware fabricates ~0 data. Use SET_PCI_ERROR_RESPONSE() to set the error response, when a faulty read occurs. This helps unify PCI error response checking and make error check consistent and easier to find. Compile tested only. Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com> --- drivers/pci/controller/pcie-altera.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c index 2513e9363236..d6c71b5d1ffb 100644 --- a/drivers/pci/controller/pcie-altera.c +++ b/drivers/pci/controller/pcie-altera.c @@ -511,7 +511,7 @@ static int altera_pcie_cfg_read(struct pci_bus *bus, unsigned int devfn, return PCIBIOS_BAD_REGISTER_NUMBER; if (!altera_pcie_valid_device(pcie, bus, PCI_SLOT(devfn))) { - *value = 0xffffffff; + SET_PCI_ERROR_RESPONSE(value); return PCIBIOS_DEVICE_NOT_FOUND; } -- 2.25.1 _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees
next prev parent reply other threads:[~2021-10-11 18:01 UTC|newest] Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-10-11 17:35 [PATCH 00/22] PCI: Unify PCI error response checking Naveen Naidu 2021-10-11 17:35 ` Naveen Naidu 2021-10-11 17:35 ` Naveen Naidu 2021-10-11 17:35 ` Naveen Naidu 2021-10-11 17:35 ` Naveen Naidu 2021-10-11 17:35 ` Naveen Naidu 2021-10-11 17:37 ` [PATCH 01/22] PCI: Add PCI_ERROR_RESPONSE and it's related defintions Naveen Naidu 2021-10-11 17:37 ` Naveen Naidu 2021-10-11 17:37 ` Naveen Naidu 2021-10-11 17:37 ` Naveen Naidu 2021-10-11 17:37 ` Naveen Naidu 2021-10-11 17:37 ` Naveen Naidu 2021-10-11 17:38 ` [PATCH 02/22] PCI: Unify PCI error response checking Naveen Naidu 2021-10-11 17:38 ` Naveen Naidu 2021-10-11 22:05 ` Rob Herring 2021-10-11 22:05 ` Rob Herring 2021-10-12 16:21 ` Naveen Naidu 2021-10-12 16:21 ` Naveen Naidu 2021-10-12 18:02 ` Rob Herring 2021-10-12 18:02 ` Rob Herring 2021-10-12 22:52 ` Pali Rohár 2021-10-12 22:52 ` Pali Rohár 2021-10-13 2:43 ` Bjorn Helgaas 2021-10-13 2:43 ` Bjorn Helgaas 2021-10-13 13:06 ` Rob Herring 2021-10-13 13:06 ` Rob Herring 2021-10-13 17:16 ` Naveen Naidu 2021-10-13 17:16 ` Naveen Naidu 2021-10-13 17:54 ` Pali Rohár 2021-10-13 17:54 ` Pali Rohár 2021-10-13 18:48 ` Bjorn Helgaas 2021-10-13 18:48 ` Bjorn Helgaas 2021-10-13 21:47 ` Rob Herring 2021-10-13 21:47 ` Rob Herring 2021-10-13 22:03 ` Pali Rohár 2021-10-13 22:03 ` Pali Rohár 2021-10-13 22:12 ` Bjorn Helgaas 2021-10-13 22:12 ` Bjorn Helgaas 2021-10-11 17:45 ` [PATCH 03/22] PCI: thunder: Use SET_PCI_ERROR_RESPONSE() when device not found Naveen Naidu 2021-10-11 17:45 ` Naveen Naidu 2021-10-11 17:45 ` Naveen Naidu 2021-10-11 17:46 ` [PATCH 04/22] PCI: iproc: " Naveen Naidu 2021-10-11 17:46 ` Naveen Naidu 2021-10-11 17:46 ` Naveen Naidu 2021-10-11 17:51 ` [PATCH 05/22] PCI: mediatek: " Naveen Naidu 2021-10-11 17:51 ` Naveen Naidu 2021-10-11 17:51 ` Naveen Naidu 2021-10-11 17:51 ` Naveen Naidu 2021-10-11 17:52 ` [PATCH 06/22] PCI: exynos: " Naveen Naidu 2021-10-11 17:52 ` Naveen Naidu 2021-10-11 17:52 ` Naveen Naidu 2021-10-11 17:53 ` [PATCH 07/22] PCI: histb: " Naveen Naidu 2021-10-11 17:53 ` Naveen Naidu 2021-10-11 17:55 ` [PATCH 08/22] PCI: kirin: " Naveen Naidu 2021-10-11 17:55 ` Naveen Naidu 2021-10-11 17:56 ` [PATCH 09/22] PCI: aardvark: " Naveen Naidu 2021-10-11 17:56 ` Naveen Naidu 2021-10-11 17:56 ` Naveen Naidu 2021-10-11 18:08 ` Pali Rohár 2021-10-11 18:08 ` Pali Rohár 2021-10-11 18:08 ` Pali Rohár 2021-10-11 18:28 ` Naveen Naidu 2021-10-11 18:28 ` Naveen Naidu 2021-10-11 18:28 ` Naveen Naidu [not found] ` <20211011182526.kboaxqofdpd2jjrl@theprophet> 2021-10-11 18:41 ` Pali Rohár 2021-10-11 18:41 ` Pali Rohár 2021-10-11 18:41 ` Pali Rohár 2021-10-12 15:59 ` Naveen Naidu 2021-10-12 15:59 ` Naveen Naidu 2021-10-12 15:59 ` Naveen Naidu 2021-10-13 2:13 ` Bjorn Helgaas 2021-10-13 2:13 ` Bjorn Helgaas 2021-10-13 2:13 ` Bjorn Helgaas 2021-10-13 17:59 ` Pali Rohár 2021-10-13 17:59 ` Pali Rohár 2021-10-13 17:59 ` Pali Rohár 2021-10-11 18:00 ` [PATCH 10/22] PCI: mvebu: " Naveen Naidu 2021-10-11 18:00 ` Naveen Naidu 2021-10-11 18:00 ` Naveen Naidu 2021-10-11 18:00 ` Naveen Naidu [this message] 2021-10-11 18:00 ` [PATCH 11/22] PCI: altera: " Naveen Naidu 2021-10-11 18:02 ` [PATCH 12/22] PCI: rcar: " Naveen Naidu 2021-10-11 18:02 ` Naveen Naidu 2021-10-11 18:02 ` [PATCH 13/22] PCI: rockchip: " Naveen Naidu 2021-10-11 18:02 ` Naveen Naidu 2021-10-11 18:02 ` Naveen Naidu 2021-10-11 18:02 ` Naveen Naidu 2021-10-11 18:04 ` [PATCH 14/22] PCI/ERR: Use RESPONSE_IS_PCI_ERROR() to check read from hardware Naveen Naidu 2021-10-11 18:04 ` Naveen Naidu 2021-10-11 18:06 ` [PATCH 15/22] PCI: vmd: " Naveen Naidu 2021-10-11 18:06 ` Naveen Naidu 2021-10-14 18:04 ` Jonathan Derrick 2021-10-14 18:04 ` Jonathan Derrick 2021-10-11 18:07 ` [PATCH 16/22] PCI: pciehp: " Naveen Naidu 2021-10-11 18:07 ` Naveen Naidu 2021-10-11 19:47 ` Lukas Wunner 2021-10-11 19:47 ` Lukas Wunner 2021-10-12 16:05 ` Naveen Naidu 2021-10-12 16:05 ` Naveen Naidu 2021-10-12 23:12 ` Pali Rohár 2021-10-12 23:12 ` Pali Rohár 2021-10-13 12:20 ` Lukas Wunner 2021-10-13 12:20 ` Lukas Wunner 2021-10-11 18:08 ` [PATCH 17/22] PCI/DPC: " Naveen Naidu 2021-10-11 18:08 ` Naveen Naidu 2021-10-11 18:08 ` Naveen Naidu 2021-10-11 18:10 ` [PATCH 18/22] PCI/PME: " Naveen Naidu 2021-10-11 18:10 ` Naveen Naidu 2021-10-11 18:11 ` [PATCH 19/22] PCI: cpqphp: " Naveen Naidu 2021-10-11 18:11 ` Naveen Naidu 2021-10-11 18:11 ` [PATCH 20/22] PCI: keystone: Use PCI_ERROR_RESPONSE to specify hardware error Naveen Naidu 2021-10-11 18:11 ` Naveen Naidu 2021-10-11 18:12 ` [PATCH 21/22] PCI: hv: Use PCI_ERROR_RESPONSE to specify hardware read error Naveen Naidu 2021-10-11 18:12 ` Naveen Naidu 2021-10-11 18:13 ` [PATCH 22/22] PCI: xgene: Use PCI_ERROR_RESPONSE to specify hardware error Naveen Naidu 2021-10-11 18:13 ` Naveen Naidu 2021-10-11 18:13 ` Naveen Naidu
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