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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, "Qiuxu Zhuo" <qiuxu.zhuo@intel.com>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Sean V Kelley" <sean.v.kelley@intel.com>
Subject: [PATCH v3 20/25] PCI/PME: Use RESPONSE_IS_PCI_ERROR() to check read from hardware
Date: Thu, 21 Oct 2021 20:37:45 +0530	[thread overview]
Message-ID: <236b7af1f36698b34c01857d0a2a18c4ab850c5f.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.

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..bad7ba420c18 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


  parent reply	other threads:[~2021-10-21 15:15 UTC|newest]

Thread overview: 34+ 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 ` [PATCH v3 01/25] PCI: Add PCI_ERROR_RESPONSE and it's related definitions Naveen Naidu
2021-10-21 16:08   ` Pali Rohár
2021-11-17 23:58   ` Bjorn Helgaas
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 15:59   ` 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 ` [PATCH v3 04/25] PCI: Remove redundant error fabrication when device read fails Naveen Naidu
2021-10-21 15:07 ` [PATCH v3 05/25] PCI: thunder: " Naveen Naidu
2021-10-21 15:07 ` [PATCH v3 06/25] PCI: iproc: " Naveen Naidu
2021-10-21 15:07 ` [PATCH v3 07/25] PCI: mediatek: " Naveen Naidu
2021-10-21 15:07 ` [PATCH v3 08/25] PCI: exynos: " Naveen Naidu
2021-10-21 15:07 ` [PATCH v3 09/25] PCI: histb: " Naveen Naidu
2021-10-21 15:07 ` [PATCH v3 10/25] PCI: kirin: " Naveen Naidu
2021-10-21 15:07 ` [PATCH v3 11/25] PCI: aardvark: " Naveen Naidu
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 ` [PATCH v3 13/25] PCI: altera: " Naveen Naidu
2021-10-21 15:07 ` [PATCH v3 14/25] PCI: rcar: " Naveen Naidu
2021-10-21 15:07 ` [PATCH v3 15/25] PCI: rockchip: " 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 ` [PATCH v3 17/25] PCI: vmd: " 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 15:22   ` Naveen Naidu
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 [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 ` [PATCH v3 23/25] PCI: keystone: " 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 ` [PATCH v3 25/25] PCI: xgene: Use PCI_ERROR_RESPONSE to specify hardware error Naveen Naidu

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