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, "Qiuxu Zhuo" <qiuxu.zhuo@intel.com>, "Sean V Kelley" <sean.v.kelley@intel.com>, "Krzysztof Wilczyński" <kw@linux.com> Subject: [PATCH 18/22] PCI/PME: Use RESPONSE_IS_PCI_ERROR() to check read from hardware Date: Mon, 11 Oct 2021 23:40:14 +0530 [thread overview] Message-ID: <53e9d01d1683ccae66b07a5b7904e2aa124c5aa3.1633972263.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 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. Compile tested only. Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com> --- drivers/pci/pcie/pme.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c index 1d0dd77fed3a..24588d0b581f 100644 --- a/drivers/pci/pcie/pme.c +++ b/drivers/pci/pcie/pme.c @@ -224,7 +224,7 @@ static void pcie_pme_work_fn(struct work_struct *work) break; pcie_capability_read_dword(port, PCI_EXP_RTSTA, &rtsta); - if (rtsta == (u32) ~0) + if (RESPONSE_IS_PCI_ERROR(&rtsta)) break; if (rtsta & PCI_EXP_RTSTA_PME) { @@ -274,7 +274,7 @@ static irqreturn_t pcie_pme_irq(int irq, void *context) spin_lock_irqsave(&data->lock, flags); pcie_capability_read_dword(port, PCI_EXP_RTSTA, &rtsta); - if (rtsta == (u32) ~0 || !(rtsta & PCI_EXP_RTSTA_PME)) { + if (RESPONSE_IS_PCI_ERROR(&rtsta) || !(rtsta & PCI_EXP_RTSTA_PME)) { spin_unlock_irqrestore(&data->lock, flags); return IRQ_NONE; } -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Naveen Naidu <naveennaidu479@gmail.com> To: bhelgaas@google.com Cc: "Sean V Kelley" <sean.v.kelley@intel.com>, "Qiuxu Zhuo" <qiuxu.zhuo@intel.com>, "Krzysztof Wilczyński" <kw@linux.com>, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org Subject: [PATCH 18/22] PCI/PME: Use RESPONSE_IS_PCI_ERROR() to check read from hardware Date: Mon, 11 Oct 2021 23:40:14 +0530 [thread overview] Message-ID: <53e9d01d1683ccae66b07a5b7904e2aa124c5aa3.1633972263.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 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. Compile tested only. Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com> --- drivers/pci/pcie/pme.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c index 1d0dd77fed3a..24588d0b581f 100644 --- a/drivers/pci/pcie/pme.c +++ b/drivers/pci/pcie/pme.c @@ -224,7 +224,7 @@ static void pcie_pme_work_fn(struct work_struct *work) break; pcie_capability_read_dword(port, PCI_EXP_RTSTA, &rtsta); - if (rtsta == (u32) ~0) + if (RESPONSE_IS_PCI_ERROR(&rtsta)) break; if (rtsta & PCI_EXP_RTSTA_PME) { @@ -274,7 +274,7 @@ static irqreturn_t pcie_pme_irq(int irq, void *context) spin_lock_irqsave(&data->lock, flags); pcie_capability_read_dword(port, PCI_EXP_RTSTA, &rtsta); - if (rtsta == (u32) ~0 || !(rtsta & PCI_EXP_RTSTA_PME)) { + if (RESPONSE_IS_PCI_ERROR(&rtsta) || !(rtsta & PCI_EXP_RTSTA_PME)) { spin_unlock_irqrestore(&data->lock, flags); return IRQ_NONE; } -- 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 18:10 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 ` [PATCH 11/22] PCI: altera: " Naveen Naidu 2021-10-11 18:00 ` 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 ` Naveen Naidu [this message] 2021-10-11 18:10 ` [PATCH 18/22] PCI/PME: " 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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