From: Naveen Naidu <naveennaidu479@gmail.com> To: bhelgaas@google.com Cc: "Krzysztof Wilczyński" <kw@linux.com>, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org Subject: [PATCH v3 21/25] PCI: cpqphp: Use RESPONSE_IS_PCI_ERROR() to check read from hardware Date: Thu, 21 Oct 2021 20:37:46 +0530 [thread overview] Message-ID: <20dd8fb823cdb1df4a6313fd5872d78d8f0860c0.1634825082.git.naveennaidu479@gmail.com> (raw) In-Reply-To: <cover.1634825082.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 RESPONSE_IS_PCI_ERROR() to check the response we get when we read data from hardware. This helps unify PCI error response checking and make error checks consistent and easier to find. Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com> --- drivers/pci/hotplug/cpqphp_ctrl.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/hotplug/cpqphp_ctrl.c b/drivers/pci/hotplug/cpqphp_ctrl.c index 1b26ca0b3701..bf14391c005f 100644 --- a/drivers/pci/hotplug/cpqphp_ctrl.c +++ b/drivers/pci/hotplug/cpqphp_ctrl.c @@ -2273,7 +2273,7 @@ static u32 configure_new_device(struct controller *ctrl, struct pci_func *func while ((function < max_functions) && (!stop_it)) { pci_bus_read_config_dword(ctrl->pci_bus, PCI_DEVFN(func->device, function), 0x00, &ID); - if (ID == 0xFFFFFFFF) { + if (RESPONSE_IS_PCI_ERROR(ID)) { function++; } else { /* Setup slot structure. */ @@ -2517,7 +2517,7 @@ static int configure_new_function(struct controller *ctrl, struct pci_func *func pci_bus_read_config_dword(pci_bus, PCI_DEVFN(device, 0), 0x00, &ID); pci_bus->number = func->bus; - if (ID != 0xFFFFFFFF) { /* device present */ + if (!RESPONSE_IS_PCI_ERROR(ID)) { /* device present */ /* Setup slot structure. */ new_slot = cpqhp_slot_create(hold_bus_node->base); -- 2.25.1 _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees
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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, skhan@linuxfoundation.org, "Krzysztof Wilczyński" <kw@linux.com> Subject: [PATCH v3 21/25] PCI: cpqphp: Use RESPONSE_IS_PCI_ERROR() to check read from hardware Date: Thu, 21 Oct 2021 20:37:46 +0530 [thread overview] Message-ID: <20dd8fb823cdb1df4a6313fd5872d78d8f0860c0.1634825082.git.naveennaidu479@gmail.com> (raw) In-Reply-To: <cover.1634825082.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 RESPONSE_IS_PCI_ERROR() to check the response we get when we read data from hardware. This helps unify PCI error response checking and make error checks consistent and easier to find. Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com> --- drivers/pci/hotplug/cpqphp_ctrl.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/hotplug/cpqphp_ctrl.c b/drivers/pci/hotplug/cpqphp_ctrl.c index 1b26ca0b3701..bf14391c005f 100644 --- a/drivers/pci/hotplug/cpqphp_ctrl.c +++ b/drivers/pci/hotplug/cpqphp_ctrl.c @@ -2273,7 +2273,7 @@ static u32 configure_new_device(struct controller *ctrl, struct pci_func *func while ((function < max_functions) && (!stop_it)) { pci_bus_read_config_dword(ctrl->pci_bus, PCI_DEVFN(func->device, function), 0x00, &ID); - if (ID == 0xFFFFFFFF) { + if (RESPONSE_IS_PCI_ERROR(ID)) { function++; } else { /* Setup slot structure. */ @@ -2517,7 +2517,7 @@ static int configure_new_function(struct controller *ctrl, struct pci_func *func pci_bus_read_config_dword(pci_bus, PCI_DEVFN(device, 0), 0x00, &ID); pci_bus->number = func->bus; - if (ID != 0xFFFFFFFF) { /* device present */ + if (!RESPONSE_IS_PCI_ERROR(ID)) { /* device present */ /* Setup slot structure. */ new_slot = cpqhp_slot_create(hold_bus_node->base); -- 2.25.1
next prev parent reply other threads:[~2021-10-21 15:14 UTC|newest] Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-10-21 15:07 [PATCH v3 00/25] Unify PCI error response checking Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 01/25] PCI: Add PCI_ERROR_RESPONSE and it's related definitions Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 16:08 ` Pali Rohár 2021-10-21 16:08 ` Pali Rohár 2021-10-21 16:08 ` Pali Rohár 2021-10-21 16:08 ` Pali Rohár 2021-10-21 16:08 ` Pali Rohár 2021-11-17 23:58 ` Bjorn Helgaas 2021-11-17 23:58 ` Bjorn Helgaas 2021-11-17 23:58 ` Bjorn Helgaas 2021-11-17 23:58 ` Bjorn Helgaas 2021-11-17 23:58 ` Bjorn Helgaas 2021-11-17 23:58 ` Bjorn Helgaas 2021-11-18 13:30 ` Naveen Naidu 2021-11-18 13:30 ` Naveen Naidu 2021-11-18 13:30 ` Naveen Naidu 2021-11-18 13:30 ` Naveen Naidu 2021-11-18 13:30 ` Naveen Naidu 2021-11-18 13:30 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 02/25] PCI: Set error response in config access defines when ops->read() fails Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:59 ` Pali Rohár 2021-10-21 15:59 ` Pali Rohár 2021-10-21 15:59 ` Pali Rohár 2021-10-21 15:59 ` Pali Rohár 2021-10-21 15:59 ` Pali Rohár 2021-10-21 15:07 ` [PATCH v3 03/25] PCI: Use SET_PCI_ERROR_RESPONSE() when device not found Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 04/25] PCI: Remove redundant error fabrication when device read fails Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 05/25] PCI: thunder: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 06/25] PCI: iproc: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 07/25] PCI: mediatek: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 08/25] PCI: exynos: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 09/25] PCI: histb: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 10/25] PCI: kirin: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 11/25] PCI: aardvark: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:58 ` Pali Rohár 2021-10-21 15:58 ` Pali Rohár 2021-10-21 15:58 ` Pali Rohár 2021-10-21 15:07 ` [PATCH v3 12/25] PCI: mvebu: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 13/25] PCI: altera: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 14/25] PCI: rcar: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 15/25] PCI: rockchip: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 16/25] PCI/ERR: Use RESPONSE_IS_PCI_ERROR() to check read from hardware Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 17/25] PCI: vmd: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:19 ` Naveen Naidu 2021-10-21 15:19 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 18/25] PCI: pciehp: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:22 ` Naveen Naidu 2021-10-21 15:22 ` Naveen Naidu 2021-10-22 7:01 ` Lukas Wunner 2021-10-22 7:01 ` Lukas Wunner 2021-10-21 15:07 ` [PATCH v3 19/25] PCI/DPC: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 20/25] PCI/PME: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu [this message] 2021-10-21 15:07 ` [PATCH v3 21/25] PCI: cpqphp: " Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 22/25] PCI: Use PCI_ERROR_RESPONSE to specify hardware error Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 23/25] PCI: keystone: " Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 24/25] PCI: hv: Use PCI_ERROR_RESPONSE to specify hardware read error Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` [PATCH v3 25/25] PCI: xgene: Use PCI_ERROR_RESPONSE to specify hardware error Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu 2021-10-21 15:07 ` Naveen Naidu
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