linux_dsm_epyc7002

mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-23 04:36:40 +07:00

History

Bjorn Helgaas 237865f195 PCI: Revert "PCI: Call pci_read_bridge_bases() from core instead of arch code" Revert `dff22d2054` ("PCI: Call pci_read_bridge_bases() from core instead of arch code"). Reading PCI bridge windows is not arch-specific in itself, but there is PCI core code that doesn't work correctly if we read them too early. For example, Hannes found this case on an ARM Freescale i.mx6 board: pci_bus 0000:00: root bus resource [mem 0x01000000-0x01efffff] pci 0000:00:00.0: PCI bridge to [bus 01-ff] pci 0000:00:00.0: BAR 8: no space for [mem size 0x01000000] (mem window) pci 0000:01:00.0: BAR 2: failed to assign [mem size 0x00200000] pci 0000:01:00.0: BAR 1: failed to assign [mem size 0x00004000] pci 0000:01:00.0: BAR 0: failed to assign [mem size 0x00000100] The 00:00.0 mem window needs to be at least 3MB: the 01:00.0 device needs 0x204100 of space, and mem windows are megabyte-aligned. Bus sizing can increase a bridge window size, but never decrease it (see `d65245c329` ("PCI: don't shrink bridge resources")). Prior to `dff22d2054`, ARM didn't read bridge windows at all, so the "original size" was zero, and we assigned a 3MB window. After `dff22d2054`, we read the bridge windows before sizing the bus. The firmware programmed a 16MB window (size 0x01000000) in 00:00.0, and since we never decrease the size, we kept 16MB even though we only needed 3MB. But 16MB doesn't fit in the host bridge aperture, so we failed to assign space for the window and the downstream devices. I think this is a defect in the PCI core: we shouldn't rely on the firmware to assign sensible windows. Ray reported a similar problem, also on ARM, with Broadcom iProc. Issues like this are too hard to fix right now, so revert `dff22d2054`. Reported-by: Hannes <oe5hpm@gmail.com> Reported-by: Ray Jui <rjui@broadcom.com> Link: http://lkml.kernel.org/r/CAAa04yFQEUJm7Jj1qMT57-LG7ZGtnhNDBe=PpSRa70Mj+XhW-A@mail.gmail.com Link: http://lkml.kernel.org/r/55F75BB8.4070405@broadcom.com Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Yinghai Lu <yinghai@kernel.org> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>		2015-09-15 13:18:04 -05:00
..
asp.c
ccio-dma.c	parisc: use seq_hex_dump() to dump buffers	2015-09-10 13:29:01 -07:00
ccio-rm-dma.c
dino.c	PCI: Revert "PCI: Call pci_read_bridge_bases() from core instead of arch code"	2015-09-15 13:18:04 -05:00
eisa_eeprom.c
eisa_enumerator.c	treewide: Fix typo in printk messages	2015-03-06 23:05:39 +01:00
eisa.c
gsc.c
gsc.h
hppb.c
iommu-helpers.h	parisc: Eliminate sg_virt_addr() and private scatterlist.h	2015-04-21 22:02:43 +02:00
iosapic_private.h
iosapic.c	parisc/irq: Use access helper irq_data_get_affinity_mask()	2015-07-31 22:20:04 +02:00
Kconfig
lasi.c
lba_pci.c	PCI: Revert "PCI: Call pci_read_bridge_bases() from core instead of arch code"	2015-09-15 13:18:04 -05:00
led.c
Makefile
pdc_stable.c	parisc: pdc_stable.c: Avoid potential stack overflows	2014-09-21 22:31:08 +02:00
power.c	sched, cleanup, treewide: Remove set_current_state(TASK_RUNNING) after schedule()	2014-09-19 12:35:17 +02:00
README.dino
sba_iommu.c	parisc: use seq_hex_dump() to dump buffers	2015-09-10 13:29:01 -07:00
superio.c	parisc: %pf is only for function pointers	2015-04-24 13:45:54 +02:00
wax.c

README.dino

/*
** HP VISUALIZE Workstation PCI Bus Defect
**
** "HP has discovered a potential system defect that can affect
** the behavior of five models of HP VISUALIZE workstations when
** equipped with third-party or customer-installed PCI I/O expansion
** cards. The defect is limited to the HP C180, C160, C160L, B160L,
** and B132L VISUALIZE workstations, and will only be encountered
** when data is transmitted through PCI I/O expansion cards on the
** PCI bus. HP-supplied graphics cards that utilize the PCI bus are
** not affected."
**
** http://h20000.www2.hp.com/bizsupport/TechSupport/Home.jsp?locale=en_US&prodTypeId=12454&prodSeriesId=44443
**
**	Product		First Good Serial Number
**  C200/C240 (US)	US67350000
**B132L+/B180 (US)	US67390000
**   C200 (Europe)	3713G01000
**  B180L (Europe)	3720G01000
**
** Note that many boards were fixed/replaced under a free replacement
** program. Assume a machine is only "suspect" until proven otherwise.
**
** "The pci_check program will also be available as application
**  patch PHSS_12295"
*/