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Message-ID: <fbbff3ed-5b4a-4288-94a9-fd8ec37741df@zhaoxin.com>
Date: Mon, 11 Sep 2023 17:21:09 +0800
From: LeoLiu-oc <leoliu-oc@...oxin.com>
To: Bjorn Helgaas <helgaas@...nel.org>
CC: <lenb@...nel.org>, <james.morse@....com>, <tony.luck@...el.com>,
<bp@...en8.de>, <bhelgaas@...gle.com>, <robert.moore@...el.com>,
<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-pci@...r.kernel.org>,
<acpica-devel@...ts.linuxfoundation.org>, <ErosZhang@...oxin.com>
Subject: Re: [PATCH v3 1/5] ACPI/APEI: Add apei_hest_parse_aer()
在 2023/8/11 7:17, Bjorn Helgaas 写道:
> On Tue, Jul 04, 2023 at 08:05:05PM +0800, LeoLiu-oc wrote:
>> From: leoliu-oc <leoliu-oc@...oxin.com>
>>
>> apei_hest_parse_aer() is used to parse and extract register values
>> from HEST PCIe AER structures.
>>
>> Signed-off-by: leoliu-oc <leoliu-oc@...oxin.com>
>> ---
>> drivers/acpi/apei/hest.c | 114 ++++++++++++++++++++++++++++++++++++++-
>> include/acpi/actbl1.h | 69 ++++++++++++++++++++++++
>> include/acpi/apei.h | 7 +++
>> 3 files changed, 189 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
>> index 6aef1ee5e1bdb..fb839a5c480ee 100644
>> --- a/drivers/acpi/apei/hest.c
>> +++ b/drivers/acpi/apei/hest.c
>> @@ -26,6 +26,7 @@
>> #include <acpi/apei.h>
>> #include <acpi/ghes.h>
>>
>> +#include <linux/pci.h>
>
> Should go in the list above along with the other <linux/...> includes.
> The trend is to alphabetize the list, so I'd put it here:
>
> #include <linux/io.h>
> +#include <linux/pci.h>
> #include <linux/platform_device.h>
>
OK, I will make the change according to your suggestion.
LeoLiu-oc
>> #include "apei-internal.h"
>>
>> #define HEST_PFX "HEST: "
>> @@ -86,7 +87,50 @@ static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
>> return len;
>> };
>>
>> -typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data);
>
> I think moving this typedef to include/acpi/apei.h should happen in
> the patch where it is needed. I *think* that's the "Remove static
> from apei_hest_parse()" patch.
>
Yes，Agree with you. It's more appropriate to move typedef into "Remove
static from apei_hest_parse()" patch.
LeoLiu-oc
>> +static bool hest_source_is_pcie_aer(struct acpi_hest_header *hest_hdr)
>> +{
>> + switch (hest_hdr->type) {
>> + case ACPI_HEST_TYPE_AER_ROOT_PORT:
>> + case ACPI_HEST_TYPE_AER_ENDPOINT:
>> + case ACPI_HEST_TYPE_AER_BRIDGE:
>> + return true;
>> + default:
>> + return false;
>> + }
>> +}
>> +
>> +static bool hest_match_type(struct acpi_hest_header *hest_hdr,
>> + struct pci_dev *dev)
>
> Align "struct pci_dev" under "struct acpi_hest_header", as is typical
> (see apei-base.c, erst.c, ghes.c)
>
OK, I will modify in next version.
LeoLiu-oc
>> +{
>> + u16 hest_type = hest_hdr->type;
>> + u8 pcie_type = pci_pcie_type(dev);
>> +
>> + if ((hest_type == ACPI_HEST_TYPE_AER_ROOT_PORT &&
>> + pcie_type == PCI_EXP_TYPE_ROOT_PORT) ||
>> + (hest_type == ACPI_HEST_TYPE_AER_ENDPOINT &&
>> + pcie_type == PCI_EXP_TYPE_ENDPOINT) ||
>> + (hest_type == ACPI_HEST_TYPE_AER_BRIDGE &&
>> + (pcie_type == PCI_EXP_TYPE_PCI_BRIDGE || pcie_type == PCI_EXP_TYPE_PCIE_BRIDGE)))
>> + return true;
>> + return false;
>> +}
>> +
>> +static bool hest_match_pci_devfn(struct acpi_hest_aer_common *p,
>> + struct pci_dev *pci)
>
> Align parameters.
>
OK.
>> +{
>> + return ACPI_HEST_SEGMENT(p->bus) == pci_domain_nr(pci->bus) &&
>> + ACPI_HEST_BUS(p->bus) == pci->bus->number &&
>> + p->device == PCI_SLOT(pci->devfn) &&
>> + p->function == PCI_FUNC(pci->devfn);
>
> Remove double space before ACPI_HEST_SEGMENT(). Align the other lines
> under ACPI_HEST_SEGMENT() and don't bother indenting the
> pci->bus->number, PCI_SLOT, PCI_FUNC, since they don't line up anyway,
> i.e.,
>
> return ACPI_HEST_SEGMENT(p->bus) == pci_domain_nr(pci->bus) &&
> ACPI_HEST_BUS(p->bus) == pci->bus->number &&
> p->device == PCI_SLOT(pci->devfn) &&
> p->function == PCI_FUNC(pci->devfn);
>
> The only allowable variable names for a pci_dev pointer are "dev" or
> "pdev" :) In this context, I think "dev" is fine (as you used above
> for hest_match_type()).
>
I'm going to unify the variable names for a "pci_dev" pointer.
LeoLiu-oc
>> +}
>> +
>> +static bool hest_match_pci(struct acpi_hest_header *hest_hdr,
>> + struct acpi_hest_aer_common *p, struct pci_dev *pci)
>> +{
>> + if (hest_match_type(hest_hdr, pci))
>> + return hest_match_pci_devfn(p, pci);
>> + return false;
>> +}
>>
>> static int apei_hest_parse(apei_hest_func_t func, void *data)
>> {
>> @@ -124,6 +168,74 @@ static int apei_hest_parse(apei_hest_func_t func, void *data)
>> return 0;
>> }
>>
>> +/*
>> + * apei_hest_parse_aer - Find the AER structure in the HEST and
>> + * match it with the PCIe device.
>> + *
>> + * @hest_hdr: To save the ACPI AER error source in HEST
>> + *
>> + * Return 1 if the PCIe dev matched with the ACPI AER error source in
>> + * HEST, else return 0.
>> + */
>> +int apei_hest_parse_aer(struct acpi_hest_header *hest_hdr, void *data)
>
> Follow the naming pattern of all the other parse functions:
>
> hest_parse_ghes_count
> hest_parse_ghes
> hest_parse_cmc
>
> E.g., "hest_parse_pcie_aer" or "hest_parse_aer".
>
OK.
>> +{
>> + struct acpi_hest_parse_aer_info *info = data;
>
>> + struct acpi_hest_aer_endpoint *acpi_hest_aer_endpoint = NULL;
>> + struct acpi_hest_aer_root_port *acpi_hest_aer_root_port = NULL;
>> + struct acpi_hest_aer_for_bridge *acpi_hest_aer_for_bridge = NULL;
>
> Unnecessary initializations since you always set these below before
> using them. But maybe there's a way to do this without these pointers
> (see below).
>
OK.
>> + if (!hest_source_is_pcie_aer(hest_hdr))
>> + return 0;
>> +
>> + switch (hest_hdr->type) {
>> + case ACPI_HEST_TYPE_AER_ROOT_PORT:
>> + acpi_hest_aer_root_port = (struct acpi_hest_aer_root_port *)(hest_hdr + 1);
>> + if (acpi_hest_aer_root_port->flags & ACPI_HEST_GLOBAL) {
>> + if (hest_match_type(hest_hdr, info->pci_dev)) {
>> + info->acpi_hest_aer_root_port = acpi_hest_aer_root_port;
>> + info->hest_matched_with_dev = 1;
>> + }
>> + } else if (hest_match_pci(hest_hdr,
>> + (struct acpi_hest_aer_common *)acpi_hest_aer_root_port,
>> + info->pci_dev)) {
>> + info->acpi_hest_aer_root_port = acpi_hest_aer_root_port;
>> + info->hest_matched_with_dev = 1;
>> + }
>> + break;
>
> Could this be refactored along the lines of this?
>
> static bool matches(struct acpi_hest_header *hest_hdr, struct pci_dev *dev)
> {
> u16 hest_type = hest_hdr->type;
> u8 pcie_type = pci_pcie_type(dev);
> struct acpi_hest_aer_common *common =
> (struct acpi_hest_aer_common *) (hest_hdr + 1);
>
> switch (hest_type) {
> case ACPI_HEST_TYPE_AER_ROOT_PORT:
> if (pcie_type != PCI_EXP_TYPE_ROOT_PORT)
> return false;
> break;
> case ACPI_HEST_TYPE_AER_ENDPOINT:
> if (pcie_type != PCI_EXP_TYPE_ENDPOINT)
> return false;
> break;
> case ACPI_HEST_TYPE_AER_BRIDGE:
> if (pcie_type != PCI_EXP_TYPE_BRIDGE &&
> pcie_type != PCI_EXP_TYPE_PCIE_BRIDGE)
> return false;
> break;
> default:
> return false;
> }
>
> if (common->flags & ACPI_HEST_GLOBAL)
> return true;
>
> if (hest_match_pci_devfn(common, dev))
> return true;
>
> return false;
> }
>
> int apei_hest_parse_aer(...)
> {
> if (!matches(hest_hdr, info->pci_dev))
> return 0;
>
> switch (hest_type) {
> case ACPI_HEST_TYPE_AER_ROOT_PORT:
> info->acpi_hest_aer_root_port =
> (struct acpi_hest_aer_root_port *)(hest_hdr + 1);
> info->hest_matched_with_dev = 1;
> return 1;
> case ACPI_HEST_TYPE_AER_ENDPOINT:
> ...
> }
>
> return 0;
> }
>
Yes, your advice makes the code clearer.
LeoLiu-oc
>> + case ACPI_HEST_TYPE_AER_ENDPOINT:
>> + acpi_hest_aer_endpoint = (struct acpi_hest_aer_endpoint *)(hest_hdr + 1);
>> + if (acpi_hest_aer_endpoint->flags & ACPI_HEST_GLOBAL) {
>> + if (hest_match_type(hest_hdr, info->pci_dev)) {
>> + info->acpi_hest_aer_endpoint = acpi_hest_aer_endpoint;
>> + info->hest_matched_with_dev = 1;
>> + }
>> + } else if (hest_match_pci(hest_hdr,
>> + (struct acpi_hest_aer_common *)acpi_hest_aer_endpoint,
>> + info->pci_dev)) {
>> + info->acpi_hest_aer_endpoint = acpi_hest_aer_endpoint;
>> + info->hest_matched_with_dev = 1;
>> + }
>> + break;
>> + case ACPI_HEST_TYPE_AER_BRIDGE:
>> + acpi_hest_aer_for_bridge = (struct acpi_hest_aer_for_bridge *)(hest_hdr + 1);
>> + if (acpi_hest_aer_for_bridge->flags & ACPI_HEST_GLOBAL) {
>> + if (hest_match_type(hest_hdr, info->pci_dev)) {
>> + info->acpi_hest_aer_for_bridge = acpi_hest_aer_for_bridge;
>> + info->hest_matched_with_dev = 1;
>> + }
>> + } else if (hest_match_pci(hest_hdr,
>> + (struct acpi_hest_aer_common *)acpi_hest_aer_for_bridge,
>> + info->pci_dev)) {
>> + info->acpi_hest_aer_for_bridge = acpi_hest_aer_for_bridge;
>> + info->hest_matched_with_dev = 1;
>> + }
>> + break;
>> + default:
>> + break;
>> + }
>> + return info->hest_matched_with_dev;
>> +}
>> +
>> /*
>> * Check if firmware advertises firmware first mode. We need FF bit to be set
>> * along with a set of MC banks which work in FF mode.
>> diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
>> index 58b0490a2ad12..31abe06c6e792 100644
>> --- a/include/acpi/actbl1.h
>> +++ b/include/acpi/actbl1.h
>> @@ -1583,6 +1583,75 @@ struct acpi_hest_aer_bridge {
>> u32 advanced_capabilities2;
>> };
>>
>> +struct acpi_hest_parse_aer_info {
>> + struct pci_dev *pci_dev;
>> + int hest_matched_with_dev;
>> + struct acpi_hest_aer_endpoint *acpi_hest_aer_endpoint;
>> + struct acpi_hest_aer_root_port *acpi_hest_aer_root_port;
>> + struct acpi_hest_aer_for_bridge *acpi_hest_aer_for_bridge;
>> +};
>> +
>> +/* HEST Sub-structure for PCIe Root Port Structure (6) */
>> +
>> +struct acpi_hest_aer_root_port {
>
> How are these different from the existing acpi_hest_aer_root,
> acpi_hest_aer, and acpi_hest_aer_bridge?
>
> I see that the existing acpi_hest_aer_root includes a struct
> acpi_hest_header and the new acpi_hest_aer_root_port does not, but
> that doesn't seem like enough reason to duplicate all the rest of the
> structure.
>
> Sorry if you've answered this before. If we really need both
> acpi_hest_aer_root and acpi_hest_aer_root_port, we should put a hint
> about the reason in the commit log and maybe even in a code comment
> here.
>
Agree with you. I will remove that part of the definition and use the
existing definition in the next version.
LeoLiu-oc
>> + u16 reserved1;
>> + u8 flags;
>> + u8 enabled;
>> + u32 records_to_preallocate;
>> + u32 max_sections_per_record;
>> + u32 bus;
>> + u16 device;
>> + u16 function;
>> + u16 device_control;
>> + u16 reserved2;
>> + u32 uncorrectable_mask;
>> + u32 uncorrectable_severity;
>> + u32 correctable_mask;
>> + u32 advanced_capabilities;
>> + u32 root_error_command;
>> +};
>
>> +/* HEST Sub-structure for PCIe/PCI-X Bridge Structure (8) */
>> +
>> +struct acpi_hest_aer_for_bridge {
>
> If this struct is needed, s/for_// (the other structs don't include
> "for_" and there's no need here).
OK.
Best Regards.
LeoLiu-oc
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