kernel/linux.git/arch/powerpc/Kconfig.debug, branch v5.15.209

powerpc: allow PPC_EARLY_DEBUG_CPM only when SERIAL_CPM=y

2023-07-23T11:47:29+00:00

[ Upstream commit 39f49684036d24af800ff194c33c7b2653c591d7 ] In a randconfig with CONFIG_SERIAL_CPM=m and CONFIG_PPC_EARLY_DEBUG_CPM=y, there is a build error: ERROR: modpost: "udbg_putc" [drivers/tty/serial/cpm_uart/cpm_uart.ko] undefined! Prevent the build error by allowing PPC_EARLY_DEBUG_CPM only when SERIAL_CPM=y. Fixes: c374e00e17f1 ("[POWERPC] Add early debug console for CPM serial ports.") Signed-off-by: Randy Dunlap Reviewed-by: Pali Rohár Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/20230701054714.30512-1-rdunlap@infradead.org Signed-off-by: Sasha Levin

powerpc/ptdump: Convert powerpc to GENERIC_PTDUMP

2021-08-25T03:35:48+00:00

This patch converts powerpc to the generic PTDUMP implementation. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/03166d569526be70214fe9370a7bad219d2f41c8.1625762907.git.christophe.leroy@csgroup.eu

powerpc: Make PPC_IRQ_SOFT_MASK_DEBUG depend on PPC64

2021-06-24T14:07:09+00:00

32-bit platforms don't have irq soft masking. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210623032909.826010-1-npiggin@gmail.com

powerpc/64s: avoid reloading (H)SRR registers if they are still valid

2021-06-24T14:06:55+00:00

When an interrupt is taken, the SRR registers are set to return to where it left off. Unless they are modified in the meantime, or the return address or MSR are modified, there is no need to reload these registers when returning from interrupt. Introduce per-CPU flags that track the validity of SRR and HSRR registers. These are cleared when returning from interrupt, when using the registers for something else (e.g., OPAL calls), when adjusting the return address or MSR of a context, and when context switching (which changes the return address and MSR). This improves the performance of interrupt returns. Signed-off-by: Nicholas Piggin [mpe: Fold in fixup patch from Nick] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210617155116.2167984-5-npiggin@gmail.com

powerpc: iommu: fix build when neither PCI or IBMVIO is set

2021-04-08T11:17:46+00:00

When neither CONFIG_PCI nor CONFIG_IBMVIO is set/enabled, iommu.c has a build error. The fault injection code is not useful in that kernel config, so make the FAIL_IOMMU option depend on PCI || IBMVIO. Prevents this build error (warning escalated to error): ../arch/powerpc/kernel/iommu.c:178:30: error: 'fail_iommu_bus_notifier' defined but not used [-Werror=unused-variable] 178 | static struct notifier_block fail_iommu_bus_notifier = { Fixes: d6b9a81b2a45 ("powerpc: IOMMU fault injection") Reported-by: kernel test robot Suggested-by: Michael Ellerman Signed-off-by: Randy Dunlap Acked-by: Randy Dunlap # build-tested Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210404192623.10697-1-rdunlap@infradead.org

powerpc/xmon: Select CONSOLE_POLL for the 8xx

2021-01-31T11:35:51+00:00

Powerpc 8xx requires CONSOLE_POLL to get udbg_putc() and udbg_getc() in CPM uart driver. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/3d10a274516e9be8c4b0dc679a2840cdc1588872.1608716197.git.christophe.leroy@csgroup.eu

powerpc: Remove Xilinx PPC405/PPC440 support

2020-05-28T13:24:34+00:00

The latest Xilinx design tools called ISE and EDK has been released in October 2013. New tool doesn't support any PPC405/PPC440 new designs. These platforms are no longer supported and tested. PowerPC 405/440 port is orphan from 2013 by commit cdeb89943bfc ("MAINTAINERS: Fix incorrect status tag") and commit 19624236cce1 ("MAINTAINERS: Update Grant's email address and maintainership") that's why it is time to remove the support fot these platforms. Signed-off-by: Michal Simek Signed-off-by: Christophe Leroy Acked-by: Arnd Bergmann Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/8c593895e2cb57d232d85ce4d8c3a1aa7f0869cc.1590079968.git.christophe.leroy@csgroup.eu

powerpc/ptdump: Only enable PPC_CHECK_WX with STRICT_KERNEL_RWX

2020-01-23T10:31:13+00:00

ptdump_check_wx() is called from mark_rodata_ro() which only exists when CONFIG_STRICT_KERNEL_RWX is selected. Fixes: 453d87f6a8ae ("powerpc/mm: Warn if W+X pages found on boot") Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/922d4939c735c6b52b4137838bcc066fffd4fc33.1578989545.git.christophe.leroy@c-s.fr

powerpc: Fix Kconfig indentation

2019-11-25T10:45:43+00:00

Adjust indentation from spaces to tab (+optional two spaces) as in coding style with command like: $ sed -e 's/^ /\t/' -i */Kconfig Signed-off-by: Krzysztof Kozlowski Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1574306461-7646-1-git-send-email-krzk@kernel.org

powerpc/xmon: add read-only mode

2019-05-02T16:54:57+00:00

Operations which write to memory and special purpose registers should be restricted on systems with integrity guarantees (such as Secure Boot) and, optionally, to avoid self-destructive behaviors. Add a config option, XMON_DEFAULT_RO_MODE, to set default xmon behavior. The kernel cmdline options xmon=ro and xmon=rw override this default. The following xmon operations are affected: memops: disable memmove disable memset disable memzcan memex: no-op'd mwrite super_regs: no-op'd write_spr bpt_cmds: disable proc_call: disable Signed-off-by: Christopher M. Riedl Reviewed-by: Oliver O'Halloran Reviewed-by: Andrew Donnellan Signed-off-by: Michael Ellerman