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Message-ID: <20131213230657.GD6746@google.com>
Date: Fri, 13 Dec 2013 16:06:57 -0700
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Betty Dall <betty.dall@...com>
Cc: lenb@...nel.org, rjw@...ysocki.net, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH] PCI AER: Handle non-AER HEST error sources in
aer_hest_parse()
On Fri, Dec 13, 2013 at 03:47:33PM -0700, Betty Dall wrote:
> Yes, that is more readable code. Thanks for revising it. I tested it on
> my system that has non-AER error sources and it works fine. One nit is
> that "Ignore" is misspelled in the subject line.
Thanks, fixed.
I should have thought longer before hitting send. I think it's worthwhile
to use the same helper in aer_hest_parse_aff(), and once I did that, it
became more obvious that aer_hest_parse() and aer_hest_parse_aff() are
essentially similar, so I wonder if it's worth consolidating them, as
below. It doesn't reduce the number of lines of code, but maybe it's
simpler for the reader?
Bjorn
commit 8e7f8d0b30d4e3e30007b10eb2916d970b5f8c93
Author: Betty Dall <betty.dall@...com>
Date: Fri Dec 13 08:23:16 2013 -0700
PCI/AER: Ignore non-PCIe AER error sources in aer_hest_parse()
aer_set_firmware_first() searches the HEST for an error source descriptor
matching the specified PCI device. It uses the apei_hest_parse() iterator
to call aer_hest_parse() for every descriptor in the HEST.
Previously, aer_hest_parse() incorrectly assumed every descriptor was for a
PCIe error source. This patch adds a check to avoid that error.
[bhelgaas: factor check into helper, use in aer_hest_parse_aff(), changelog]
Signed-off-by: Betty Dall <betty.dall@...com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
diff --git a/drivers/pci/pcie/aer/aerdrv_acpi.c b/drivers/pci/pcie/aer/aerdrv_acpi.c
index cf611ab2193a..a23995749f1d 100644
--- a/drivers/pci/pcie/aer/aerdrv_acpi.c
+++ b/drivers/pci/pcie/aer/aerdrv_acpi.c
@@ -50,12 +50,24 @@ struct aer_hest_parse_info {
int firmware_first;
};
+static int hest_source_is_pcie_aer(struct acpi_hest_header *hest_hdr)
+{
+ if (hest_hdr->type == ACPI_HEST_TYPE_AER_ROOT_PORT ||
+ hest_hdr->type == ACPI_HEST_TYPE_AER_ENDPOINT ||
+ hest_hdr->type == ACPI_HEST_TYPE_AER_BRIDGE)
+ return 1;
+ return 0;
+}
+
static int aer_hest_parse(struct acpi_hest_header *hest_hdr, void *data)
{
struct aer_hest_parse_info *info = data;
struct acpi_hest_aer_common *p;
int ff;
+ if (!hest_source_is_pcie_aer(hest_hdr))
+ return 0;
+
p = (struct acpi_hest_aer_common *)(hest_hdr + 1);
ff = !!(p->flags & ACPI_HEST_FIRMWARE_FIRST);
if (p->flags & ACPI_HEST_GLOBAL) {
@@ -104,15 +116,12 @@ static int aer_hest_parse_aff(struct acpi_hest_header *hest_hdr, void *data)
if (aer_firmware_first)
return 0;
- switch (hest_hdr->type) {
- case ACPI_HEST_TYPE_AER_ROOT_PORT:
- case ACPI_HEST_TYPE_AER_ENDPOINT:
- case ACPI_HEST_TYPE_AER_BRIDGE:
- p = (struct acpi_hest_aer_common *)(hest_hdr + 1);
- aer_firmware_first = !!(p->flags & ACPI_HEST_FIRMWARE_FIRST);
- default:
+ if (!hest_source_is_pcie_aer(hest_hdr))
return 0;
- }
+
+ p = (struct acpi_hest_aer_common *)(hest_hdr + 1);
+ aer_firmware_first = !!(p->flags & ACPI_HEST_FIRMWARE_FIRST);
+ return 0;
}
/**
commit 01600a1b034f93dab6f855c81626b8030b85aec0
Author: Bjorn Helgaas <bhelgaas@...gle.com>
Date: Fri Dec 13 15:42:53 2013 -0700
PCI/AER: Consolidate HEST error source parsers
aer_hest_parse() and aer_hest_parse_aff() are almost identical.
We use aer_hest_parse() to check the ACPI_HEST_FIRMWARE_FIRST flag for a
specific device, and we use aer_hest_parse_aff() to check to see if any
device sets the flag.
This drops aer_hest_parse_aff() and enhances aer_hest_parse() so it
collects the union of the ACPI_HEST_FIRMWARE_FIRST flag setting when no
specific device is supplied.
No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
diff --git a/drivers/pci/pcie/aer/aerdrv_acpi.c b/drivers/pci/pcie/aer/aerdrv_acpi.c
index a23995749f1d..4d6991794fa2 100644
--- a/drivers/pci/pcie/aer/aerdrv_acpi.c
+++ b/drivers/pci/pcie/aer/aerdrv_acpi.c
@@ -70,6 +70,17 @@ static int aer_hest_parse(struct acpi_hest_header *hest_hdr, void *data)
p = (struct acpi_hest_aer_common *)(hest_hdr + 1);
ff = !!(p->flags & ACPI_HEST_FIRMWARE_FIRST);
+
+ /*
+ * If no specific device is supplied, determine whether
+ * FIRMWARE_FIRST is set for *any* PCIe device.
+ */
+ if (!info->pci_dev) {
+ info->firmware_first |= ff;
+ return 0;
+ }
+
+ /* Otherwise, check the specific device */
if (p->flags & ACPI_HEST_GLOBAL) {
if (hest_match_type(hest_hdr, info->pci_dev))
info->firmware_first = ff;
@@ -109,30 +120,20 @@ int pcie_aer_get_firmware_first(struct pci_dev *dev)
static bool aer_firmware_first;
-static int aer_hest_parse_aff(struct acpi_hest_header *hest_hdr, void *data)
-{
- struct acpi_hest_aer_common *p;
-
- if (aer_firmware_first)
- return 0;
-
- if (!hest_source_is_pcie_aer(hest_hdr))
- return 0;
-
- p = (struct acpi_hest_aer_common *)(hest_hdr + 1);
- aer_firmware_first = !!(p->flags & ACPI_HEST_FIRMWARE_FIRST);
- return 0;
-}
-
/**
* aer_acpi_firmware_first - Check if APEI should control AER.
*/
bool aer_acpi_firmware_first(void)
{
static bool parsed = false;
+ struct aer_hest_parse_info info = {
+ .pci_dev = NULL, /* Check all PCIe devices */
+ .firmware_first = 0,
+ };
if (!parsed) {
- apei_hest_parse(aer_hest_parse_aff, NULL);
+ apei_hest_parse(aer_hest_parse, &info);
+ aer_firmware_first = info.firmware_first;
parsed = true;
}
return aer_firmware_first;
--
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