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,
"Robert Richter" <rric@kernel.org>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 03/22] PCI: thunder: Use SET_PCI_ERROR_RESPONSE() when device not found
Date: Mon, 11 Oct 2021 23:15:10 +0530 [thread overview]
Message-ID: <c5f9e140106cd6a38026300a4e5e5e6ad9257fb3.1633972263.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.
Signed-off-by: Naveen Naidu <naveennaidu479@gmail.com>
---
drivers/pci/controller/pci-thunder-ecam.c | 20 ++++++++++----------
drivers/pci/controller/pci-thunder-pem.c | 2 +-
2 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/drivers/pci/controller/pci-thunder-ecam.c b/drivers/pci/controller/pci-thunder-ecam.c
index ffd84656544f..4c57ad2aa9aa 100644
--- a/drivers/pci/controller/pci-thunder-ecam.c
+++ b/drivers/pci/controller/pci-thunder-ecam.c
@@ -42,7 +42,7 @@ static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
if (where_a == 0x4) {
addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */
if (!addr) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(addr);
@@ -57,7 +57,7 @@ static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */
if (!addr) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
barl_orig = readl(addr + 0);
@@ -73,7 +73,7 @@ static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
if (where_a == 0xc) {
addr = bus->ops->map_bus(bus, devfn, bar + 4); /* BAR 1 */
if (!addr) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(addr); /* EA entry-3. Base-H */
@@ -105,7 +105,7 @@ static int thunder_ecam_p2_config_read(struct pci_bus *bus, unsigned int devfn,
addr = bus->ops->map_bus(bus, devfn, where_a);
if (!addr) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
@@ -136,7 +136,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
addr = bus->ops->map_bus(bus, devfn, 0xc);
if (!addr) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
@@ -147,7 +147,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
addr = bus->ops->map_bus(bus, devfn, 8);
if (!addr) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
@@ -177,7 +177,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
addr = bus->ops->map_bus(bus, devfn, 0);
if (!addr) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
@@ -197,7 +197,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
addr = bus->ops->map_bus(bus, devfn, 0x70);
if (!addr) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
/* E_CAP */
@@ -212,7 +212,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
if (where_a == 0xb0) {
addr = bus->ops->map_bus(bus, devfn, where_a);
if (!addr) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(addr);
@@ -269,7 +269,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
if (where_a == 0x70) {
addr = bus->ops->map_bus(bus, devfn, where_a);
if (!addr) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(addr);
diff --git a/drivers/pci/controller/pci-thunder-pem.c b/drivers/pci/controller/pci-thunder-pem.c
index 0660b9da204f..a463a1b61f23 100644
--- a/drivers/pci/controller/pci-thunder-pem.c
+++ b/drivers/pci/controller/pci-thunder-pem.c
@@ -42,7 +42,7 @@ static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn,
struct thunder_pem_pci *pem_pci = (struct thunder_pem_pci *)cfg->priv;
if (devfn != 0 || where >= 2048) {
- *val = ~0;
+ SET_PCI_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
--
2.25.1
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next prev parent reply other threads:[~2021-10-11 17:48 UTC|newest]
Thread overview: 16+ 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 17:37 ` [PATCH 01/22] PCI: Add PCI_ERROR_RESPONSE and it's related defintions Naveen Naidu
2021-10-11 17:45 ` Naveen Naidu [this message]
2021-10-11 17:46 ` [PATCH 04/22] PCI: iproc: Use SET_PCI_ERROR_RESPONSE() when device not found Naveen Naidu
2021-10-11 17:51 ` [PATCH 05/22] PCI: mediatek: " Naveen Naidu
2021-10-11 17:52 ` [PATCH 06/22] PCI: exynos: " Naveen Naidu
2021-10-11 17:56 ` [PATCH 09/22] PCI: aardvark: " Naveen Naidu
2021-10-11 18:08 ` Pali Rohár
2021-10-11 18:28 ` Naveen Naidu
[not found] ` <20211011182526.kboaxqofdpd2jjrl@theprophet>
2021-10-11 18:41 ` Pali Rohár
2021-10-12 15:59 ` Naveen Naidu
2021-10-13 2:13 ` Bjorn Helgaas
2021-10-13 17:59 ` Pali Rohár
2021-10-11 18:00 ` [PATCH 10/22] PCI: mvebu: " Naveen Naidu
2021-10-11 18:02 ` [PATCH 13/22] PCI: rockchip: " Naveen Naidu
2021-10-11 18:13 ` [PATCH 22/22] PCI: xgene: Use PCI_ERROR_RESPONSE to specify hardware error Naveen Naidu
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