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Date: Fri, 17 Jun 2022 14:55:15 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Hans de Goede <hdegoede@...hat.com>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Krzysztof Wilczyński <kw@...ux.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Myron Stowe <myron.stowe@...hat.com>,
Juha-Pekka Heikkila <juhapekka.heikkila@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H . Peter Anvin" <hpa@...or.com>,
Benoit Grégoire <benoitg@...us.ca>,
Hui Wang <hui.wang@...onical.com>, linux-acpi@...r.kernel.org,
linux-pci@...r.kernel.org, x86@...nel.org,
linux-kernel@...r.kernel.org,
"Guilherme G . Piccoli" <gpiccoli@...lia.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Benjamin Coddington <bcodding@...hat.com>,
Keith Busch <kbusch@...nel.org>
Subject: Re: [PATCH] x86/PCI: Revert: "Clip only host bridge windows for E820
regions"
[+cc Andy, Benjamin, Keith]
On Sun, Jun 12, 2022 at 04:43:25PM +0200, Hans de Goede wrote:
> Clipping the bridge windows directly from pci_acpi_root_prepare_resources()
> instead of clipping from arch_remove_reservations(), has a number of
> unforseen consequences.
>
> If there is an e820 reservation in the middle of a bridge window, then
> the smallest of the 2 remaining parts of the window will be also clipped
> off. Where as the previous code would clip regions requested by devices,
> rather then the entire window, leaving regions which were either entirely
> above or below a reservation in the middle of the window alone.
>
> E.g. on the Steam Deck this leads to this log message:
>
> acpi PNP0A08:00: clipped [mem 0x80000000-0xf7ffffff window] to [mem 0xa0100000-0xf7ffffff window]
>
> which then gets followed by these log messages:
>
> pci 0000:00:01.2: can't claim BAR 14 [mem 0x80600000-0x806fffff]: no compatible bridge window
> pci 0000:00:01.3: can't claim BAR 14 [mem 0x80500000-0x805fffff]: no compatible bridge window
>
> and many more of these. Ultimately this leads to the Steam Deck
> no longer booting properly, so revert the change.
>
> Note this is not a clean revert, this revert keeps the later change
> to make the clipping dependent on a new pci_use_e820 bool, moving
> the checking of this bool to arch_remove_reservations().
>
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=216109
> Fixes: 4c5e242d3e93 ("x86/PCI: Clip only host bridge windows for E820 regions")
> Reported-and-tested-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Applied to for-linus for v5.19. Thanks for cleaning up my mess, Hans.
> ---
> arch/x86/include/asm/e820/api.h | 5 -----
> arch/x86/include/asm/pci_x86.h | 8 ++++++++
> arch/x86/kernel/resource.c | 14 +++++++++-----
> arch/x86/pci/acpi.c | 8 +-------
> 4 files changed, 18 insertions(+), 17 deletions(-)
>
> diff --git a/arch/x86/include/asm/e820/api.h b/arch/x86/include/asm/e820/api.h
> index 5a39ed59b6db..e8f58ddd06d9 100644
> --- a/arch/x86/include/asm/e820/api.h
> +++ b/arch/x86/include/asm/e820/api.h
> @@ -4,9 +4,6 @@
>
> #include <asm/e820/types.h>
>
> -struct device;
> -struct resource;
> -
> extern struct e820_table *e820_table;
> extern struct e820_table *e820_table_kexec;
> extern struct e820_table *e820_table_firmware;
> @@ -46,8 +43,6 @@ extern void e820__register_nosave_regions(unsigned long limit_pfn);
>
> extern int e820__get_entry_type(u64 start, u64 end);
>
> -extern void remove_e820_regions(struct device *dev, struct resource *avail);
> -
> /*
> * Returns true iff the specified range [start,end) is completely contained inside
> * the ISA region.
> diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
> index f52a886d35cf..70533fdcbf02 100644
> --- a/arch/x86/include/asm/pci_x86.h
> +++ b/arch/x86/include/asm/pci_x86.h
> @@ -69,6 +69,8 @@ void pcibios_scan_specific_bus(int busn);
>
> /* pci-irq.c */
>
> +struct pci_dev;
> +
> struct irq_info {
> u8 bus, devfn; /* Bus, device and function */
> struct {
> @@ -246,3 +248,9 @@ static inline void mmio_config_writel(void __iomem *pos, u32 val)
> # define x86_default_pci_init_irq NULL
> # define x86_default_pci_fixup_irqs NULL
> #endif
> +
> +#if defined(CONFIG_PCI) && defined(CONFIG_ACPI)
> +extern bool pci_use_e820;
> +#else
> +#define pci_use_e820 false
> +#endif
> diff --git a/arch/x86/kernel/resource.c b/arch/x86/kernel/resource.c
> index db2b350a37b7..bba1abd05bfe 100644
> --- a/arch/x86/kernel/resource.c
> +++ b/arch/x86/kernel/resource.c
> @@ -1,7 +1,8 @@
> // SPDX-License-Identifier: GPL-2.0
> -#include <linux/dev_printk.h>
> #include <linux/ioport.h>
> +#include <linux/printk.h>
> #include <asm/e820/api.h>
> +#include <asm/pci_x86.h>
>
> static void resource_clip(struct resource *res, resource_size_t start,
> resource_size_t end)
> @@ -24,14 +25,14 @@ static void resource_clip(struct resource *res, resource_size_t start,
> res->start = end + 1;
> }
>
> -void remove_e820_regions(struct device *dev, struct resource *avail)
> +static void remove_e820_regions(struct resource *avail)
> {
> int i;
> struct e820_entry *entry;
> u64 e820_start, e820_end;
> struct resource orig = *avail;
>
> - if (!(avail->flags & IORESOURCE_MEM))
> + if (!pci_use_e820)
> return;
>
> for (i = 0; i < e820_table->nr_entries; i++) {
> @@ -41,7 +42,7 @@ void remove_e820_regions(struct device *dev, struct resource *avail)
>
> resource_clip(avail, e820_start, e820_end);
> if (orig.start != avail->start || orig.end != avail->end) {
> - dev_info(dev, "clipped %pR to %pR for e820 entry [mem %#010Lx-%#010Lx]\n",
> + pr_info("clipped %pR to %pR for e820 entry [mem %#010Lx-%#010Lx]\n",
> &orig, avail, e820_start, e820_end);
> orig = *avail;
> }
> @@ -55,6 +56,9 @@ void arch_remove_reservations(struct resource *avail)
> * the low 1MB unconditionally, as this area is needed for some ISA
> * cards requiring a memory range, e.g. the i82365 PCMCIA controller.
> */
> - if (avail->flags & IORESOURCE_MEM)
> + if (avail->flags & IORESOURCE_MEM) {
> resource_clip(avail, BIOS_ROM_BASE, BIOS_ROM_END);
> +
> + remove_e820_regions(avail);
> + }
> }
> diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
> index a4f43054bc79..2f82480fd430 100644
> --- a/arch/x86/pci/acpi.c
> +++ b/arch/x86/pci/acpi.c
> @@ -8,7 +8,6 @@
> #include <linux/pci-acpi.h>
> #include <asm/numa.h>
> #include <asm/pci_x86.h>
> -#include <asm/e820/api.h>
>
> struct pci_root_info {
> struct acpi_pci_root_info common;
> @@ -20,7 +19,7 @@ struct pci_root_info {
> #endif
> };
>
> -static bool pci_use_e820 = true;
> +bool pci_use_e820 = true;
> static bool pci_use_crs = true;
> static bool pci_ignore_seg;
>
> @@ -387,11 +386,6 @@ static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
>
> status = acpi_pci_probe_root_resources(ci);
>
> - if (pci_use_e820) {
> - resource_list_for_each_entry(entry, &ci->resources)
> - remove_e820_regions(&device->dev, entry->res);
> - }
> -
> if (pci_use_crs) {
> resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
> if (resource_is_pcicfg_ioport(entry->res))
> --
> 2.36.0
>
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