From: "Pali Rohár" <pali@kernel.org>
To: Naveen Naidu <naveennaidu479@gmail.com>
Cc: bhelgaas@google.com,
linux-kernel-mentees@lists.linuxfoundation.org,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"moderated list:PCI DRIVER FOR AARDVARK (Marvell Armada 3700)"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 09/22] PCI: aardvark: Use SET_PCI_ERROR_RESPONSE() when device not found
Date: Mon, 11 Oct 2021 20:08:50 +0200 [thread overview]
Message-ID: <20211011180850.hgp4ctykvus37fx7@pali> (raw)
In-Reply-To: <f423dc9cc90e345680d289d5df7ff469e9b89c60.1633972263.git.naveennaidu479@gmail.com>
On Monday 11 October 2021 23:26:33 Naveen Naidu wrote:
> 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/pci-aardvark.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
> index 596ebcfcc82d..dc2f820ef55f 100644
> --- a/drivers/pci/controller/pci-aardvark.c
> +++ b/drivers/pci/controller/pci-aardvark.c
> @@ -894,7 +894,7 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
> int ret;
>
> if (!advk_pcie_valid_device(pcie, bus, devfn)) {
> - *val = 0xffffffff;
> + SET_PCI_ERROR_RESPONSE(val);
Hello! Now I'm looking at this macro, and should not it depends on
"size" argument? If doing 8-bit or 16-bit read operation then should not
it rather sets only low 8 bits or low 16 bits to ones?
> return PCIBIOS_DEVICE_NOT_FOUND;
> }
>
> @@ -920,7 +920,7 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
> *val = CFG_RD_CRS_VAL;
> return PCIBIOS_SUCCESSFUL;
> }
> - *val = 0xffffffff;
> + SET_PCI_ERROR_RESPONSE(val);
> return PCIBIOS_SET_FAILED;
> }
>
> @@ -955,14 +955,14 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
> *val = CFG_RD_CRS_VAL;
> return PCIBIOS_SUCCESSFUL;
> }
> - *val = 0xffffffff;
> + SET_PCI_ERROR_RESPONSE(val);
> return PCIBIOS_SET_FAILED;
> }
>
> /* Check PIO status and get the read result */
> ret = advk_pcie_check_pio_status(pcie, allow_crs, val);
> if (ret < 0) {
> - *val = 0xffffffff;
> + SET_PCI_ERROR_RESPONSE(val);
> return PCIBIOS_SET_FAILED;
> }
>
> --
> 2.25.1
>
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next prev parent reply other threads:[~2021-10-11 18:11 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 ` [PATCH 03/22] PCI: thunder: Use SET_PCI_ERROR_RESPONSE() when device not found Naveen Naidu
2021-10-11 17:46 ` [PATCH 04/22] PCI: iproc: " 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 [this message]
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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