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Message-ID: <2287772.ElGaqSPkdT@kreacher>
Date: Tue, 10 Jan 2023 19:12:42 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: "Luck, Tony" <tony.luck@...el.com>,
Bjorn Helgaas <helgaas@...nel.org>
Cc: "Williams, Dan J" <dan.j.williams@...el.com>,
"Liang, Kan" <kan.liang@...ux.intel.com>,
"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
"hdegoede@...hat.com" <hdegoede@...hat.com>,
"kernelorg@...ead.fr" <kernelorg@...ead.fr>,
"kjhambrick@...il.com" <kjhambrick@...il.com>,
"2lprbe78@...k.com" <2lprbe78@...k.com>,
"nicholas.johnson-opensource@...look.com.au"
<nicholas.johnson-opensource@...look.com.au>,
"benoitg@...us.ca" <benoitg@...us.ca>,
"mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
"wse@...edocomputers.com" <wse@...edocomputers.com>,
"mumblingdrunkard@...tonmail.com" <mumblingdrunkard@...tonmail.com>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Box, David E" <david.e.box@...el.com>,
"Sun, Yunying" <yunying.sun@...el.com>,
"Jiang, Dave" <dave.jiang@...el.com>
Subject: Re: Bug report: the extended PCI config space is missed with 6.2-rc2
On Friday, January 6, 2023 11:04:49 PM CET Bjorn Helgaas wrote:
> On Fri, Jan 06, 2023 at 09:37:06PM +0000, Luck, Tony wrote:
> > > Thanks, Tony! Something is wrong with the EFI MMIO removal
> > > (obviously), but I don't see what it is. Could you try the patch
> > > below (replacement for previous one, with more debug)?
> >
> > Swapped out old patch for this new one. Booted with efi-debug
> >
> > New dmesg attached.
>
> Thanks! Ah, off-by-one error because e820__mapped_all() expects
> "[start, end)" which means is_acpi_reserved() and is_efi_mmio() must
> use the same, and I was thinking "[start, end]" like a struct
> resource.
>
> The below should work better.
>
> commit 696ac9286d3d ("x86/pci: Treat EfiMemoryMappedIO as reservation of ECAM space")
> parent 1b929c02afd3
> Author: Bjorn Helgaas <bhelgaas@...gle.com>
> Date: Thu Jan 5 16:02:58 2023 -0600
>
> x86/pci: Treat EfiMemoryMappedIO as reservation of ECAM space
>
> Normally we reject ECAM space unless it is reported as reserved in the E820
> table or via a PNP0C02 _CRS method (PCI Firmware, r3.3, sec 4.1.2). This
> means extended config space (offsets 0x100-0xfff) may not be accessible.
>
> Some firmware doesn't report ECAM space via PNP0C02 _CRS methods, but does
> mention it as an EfiMemoryMappedIO region via EFI GetMemoryMap(), which is
> normally converted to an E820 entry by a bootloader or EFI stub.
>
> 07eab0901ede ("efi/x86: Remove EfiMemoryMappedIO from E820 map"), removes
> E820 entries that correspond to EfiMemoryMappedIO regions because some
> other firmware uses EfiMemoryMappedIO for PCI host bridge windows, and the
> E820 entries prevent Linux from allocating BAR space for hot-added devices.
>
> Allow use of ECAM for extended config space when the region is covered by
> an EfiMemoryMappedIO region, even if it's not included in E820 or PNP0C02
> _CRS.
>
> Fixes: 07eab0901ede ("efi/x86: Remove EfiMemoryMappedIO from E820 map")
> Link: https://lore.kernel.org/r/ac2693d8-8ba3-72e0-5b66-b3ae008d539d@linux.intel.com
This prints quite a few debug-level messages to dmesg. I guess you'll post an
update with fewer of them?
In any case, please feel free to add
Acked-by: Rafael J. Wysocki <rafael@...nel.org>
to it.
>
> diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
> index 758cbfe55daa..5c6cadd60fef 100644
> --- a/arch/x86/pci/mmconfig-shared.c
> +++ b/arch/x86/pci/mmconfig-shared.c
> @@ -12,6 +12,7 @@
> */
>
> #include <linux/acpi.h>
> +#include <linux/efi.h>
> #include <linux/pci.h>
> #include <linux/init.h>
> #include <linux/bitmap.h>
> @@ -442,6 +443,34 @@ static bool is_acpi_reserved(u64 start, u64 end, enum e820_type not_used)
> return mcfg_res.flags;
> }
>
> +static bool is_efi_mmio(u64 start, u64 end, enum e820_type not_used)
> +{
> + efi_memory_desc_t *md;
> + u64 size, mmio_start, mmio_end;
> +
> + end--; /* caller supplies start, end = start + size */
> + pr_info("is_efi_mmio %#lx-%#lx\n",
> + (unsigned long) start, (unsigned long) end);
> + for_each_efi_memory_desc(md) {
> + if (md->type == EFI_MEMORY_MAPPED_IO) {
> + size = md->num_pages << EFI_PAGE_SHIFT;
> + mmio_start = md->phys_addr;
> + mmio_end = mmio_start + size - 1;
> +
> + pr_info(" efi_mmio %#lx-%#lx\n",
> + (unsigned long) mmio_start,
> + (unsigned long) mmio_end);
> + if (mmio_start <= start && end <= mmio_end) {
> + pr_info("is_efi_mmio true\n");
> + return true;
> + }
> + }
> + }
> +
> + pr_info("is_efi_mmio false\n");
> + return false;
> +}
> +
> typedef bool (*check_reserved_t)(u64 start, u64 end, enum e820_type type);
>
> static bool __ref is_mmconf_reserved(check_reserved_t is_reserved,
> @@ -452,23 +481,24 @@ static bool __ref is_mmconf_reserved(check_reserved_t is_reserved,
> u64 size = resource_size(&cfg->res);
> u64 old_size = size;
> int num_buses;
> - char *method = with_e820 ? "E820" : "ACPI motherboard resources";
> + char *method = with_e820 ? "E820" : "ACPI motherboard resources or EFI";
>
> + pr_info("is_mmconf_reserved %ps [bus %02x-%02x] %pR\n",
> + is_reserved, cfg->start_bus, cfg->end_bus, &cfg->res);
> while (!is_reserved(addr, addr + size, E820_TYPE_RESERVED)) {
> + pr_info(" %#lx-%#lx (size %#lx) not reserved\n",
> + (unsigned long) addr, (unsigned long) (addr + size - 1),
> + (unsigned long) size);
> size >>= 1;
> + pr_info(" size reduced to %#lx\n", (unsigned long) size);
> if (size < (16UL<<20))
> break;
> }
>
> - if (size < (16UL<<20) && size != old_size)
> + if (size < (16UL<<20) && size != old_size) {
> + pr_info("is_mmconf_reserved %ps false\n", is_reserved);
> return false;
> -
> - if (dev)
> - dev_info(dev, "MMCONFIG at %pR reserved in %s\n",
> - &cfg->res, method);
> - else
> - pr_info(PREFIX "MMCONFIG at %pR reserved in %s\n",
> - &cfg->res, method);
> + }
>
> if (old_size != size) {
> /* update end_bus */
> @@ -487,30 +517,42 @@ static bool __ref is_mmconf_reserved(check_reserved_t is_reserved,
> &cfg->res, (unsigned long) cfg->address);
> else
> pr_info(PREFIX
> - "MMCONFIG for %04x [bus%02x-%02x] "
> + "MMCONFIG for %04x [bus %02x-%02x] "
> "at %pR (base %#lx) (size reduced!)\n",
> cfg->segment, cfg->start_bus, cfg->end_bus,
> &cfg->res, (unsigned long) cfg->address);
> }
>
> + if (dev)
> + dev_info(dev, "MMCONFIG at %pR reserved in %s\n",
> + &cfg->res, method);
> + else
> + pr_info(PREFIX "MMCONFIG at %pR reserved in %s\n",
> + &cfg->res, method);
> +
> return true;
> }
>
> static bool __ref
> pci_mmcfg_check_reserved(struct device *dev, struct pci_mmcfg_region *cfg, int early)
> {
> + pr_info("pci_mmcfg_check_reserved([bus %02x-%02x] %pR, %s)\n",
> + cfg->start_bus, cfg->end_bus, &cfg->res,
> + early ? "early" : "late");
> if (!early && !acpi_disabled) {
> if (is_mmconf_reserved(is_acpi_reserved, cfg, dev, 0))
> return true;
> + if (is_mmconf_reserved(is_efi_mmio, cfg, dev, 0))
> + return true;
>
> if (dev)
> dev_info(dev, FW_INFO
> - "MMCONFIG at %pR not reserved in "
> + "MMCONFIG at %pR not reserved in EFI or "
> "ACPI motherboard resources\n",
> &cfg->res);
> else
> pr_info(FW_INFO PREFIX
> - "MMCONFIG at %pR not reserved in "
> + "MMCONFIG at %pR not reserved in EFI or "
> "ACPI motherboard resources\n",
> &cfg->res);
> }
> @@ -536,6 +578,7 @@ static void __init pci_mmcfg_reject_broken(int early)
> {
> struct pci_mmcfg_region *cfg;
>
> + pr_info("pci_mmcfg_reject_broken(%s)\n", early ? "early" : "late");
> list_for_each_entry(cfg, &pci_mmcfg_list, list) {
> if (pci_mmcfg_check_reserved(NULL, cfg, early) == 0) {
> pr_info(PREFIX "not using MMCONFIG\n");
> @@ -570,6 +613,7 @@ static int __init pci_parse_mcfg(struct acpi_table_header *header)
> unsigned long i;
> int entries;
>
> + pr_info("pci_parse_mcfg\n");
> if (!header)
> return -EINVAL;
>
> @@ -661,6 +705,7 @@ static int __initdata known_bridge;
>
> void __init pci_mmcfg_early_init(void)
> {
> + pr_info("pci_mmcfg_early_init\n");
> if (pci_probe & PCI_PROBE_MMCONF) {
> if (pci_mmcfg_check_hostbridge())
> known_bridge = 1;
> @@ -674,6 +719,7 @@ void __init pci_mmcfg_early_init(void)
>
> void __init pci_mmcfg_late_init(void)
> {
> + pr_info("pci_mmcfg_late_init\n");
> /* MMCONFIG disabled */
> if ((pci_probe & PCI_PROBE_MMCONF) == 0)
> return;
> @@ -725,6 +771,8 @@ int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
> struct resource *tmp = NULL;
> struct pci_mmcfg_region *cfg;
>
> + dev_info(dev, "pci_mmconfig_insert %02x-%02x addr %#lx\n",
> + start, end, (unsigned long)addr);
> if (!(pci_probe & PCI_PROBE_MMCONF) || pci_mmcfg_arch_init_failed)
> return -ENODEV;
>
> @@ -788,6 +836,7 @@ int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
>
> mutex_unlock(&pci_mmcfg_lock);
>
> + dev_info(dev, "pci_mmconfig_insert returns %d\n", rc);
> return rc;
> }
>
>
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