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RISC-V Fixes for 5.0-rc5

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This patch set contains a handful of mostly-independent patches:
 
 * A patch that causes our port to respect TIF_NEED_RESCHED, which fixes
   CONFIG_PREEMPT=y kernels.
 * A fix to avoid double-put on OF nodes.
 * Fix a misspelling of target in our Kconfig.
 * Generic PCIe is enabled in our defconfig.
 * A fix to our SBI early console to properly handle line endings.
 * A fix such that max_low_pfn is counted in PFNs.
 * A change to TASK_UNMAPPED_BASE to match what other arches do.
 
 This has passed by standard "boot Fedora" flow.
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Merge tag 'riscv-for-linus-5.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux

Pull RISC-V fixes from Palmer Dabbelt:
 "This contains a handful of mostly-independent patches:

   - make our port respect TIF_NEED_RESCHED, which fixes
     CONFIG_PREEMPT=y kernels

   - fix double-put of OF nodes

   - fix a misspelling of target in our Kconfig

   - generic PCIe is enabled in our defconfig

   - fix our SBI early console to properly handle line
     endings

   - fix max_low_pfn being counted in PFNs

   - a change to TASK_UNMAPPED_BASE to match what other
     arches do

  This has passed my standard 'boot Fedora' flow"

* tag 'riscv-for-linus-5.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux:
  riscv: Adjust mmap base address at a third of task size
  riscv: fixup max_low_pfn with PFN_DOWN.
  tty/serial: use uart_console_write in the RISC-V SBL early console
  RISC-V: defconfig: Add CRYPTO_DEV_VIRTIO=y
  RISC-V: defconfig: Enable Generic PCIE by default
  RISC-V: defconfig: Move CONFIG_PCI{,E_XILINX}
  RISC-V: Kconfig: fix spelling mistake "traget" -> "target"
  RISC-V: asm/page.h: fix spelling mistake "CONFIG_64BITS" -> "CONFIG_64BIT"
  RISC-V: fix bad use of of_node_put
  RISC-V: Add _TIF_NEED_RESCHED check for kernel thread when CONFIG_PREEMPT=y
This commit is contained in:
Linus Torvalds 2019-02-02 10:26:14 -08:00
commit 74b13e7efe
10 changed files with 38 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/riscv/Kconfig
View File

@ -103,7 +103,7 @@ choice
prompt "Base ISA"
default ARCH_RV64I
help
This selects the base ISA that this kernel will traget and must match
This selects the base ISA that this kernel will target and must match
the target platform.
config ARCH_RV32I

8
arch/riscv/configs/defconfig
View File

@ -13,8 +13,6 @@ CONFIG_BLK_DEV_INITRD=y
CONFIG_EXPERT=y
CONFIG_BPF_SYSCALL=y
CONFIG_SMP=y
CONFIG_PCI=y
CONFIG_PCIE_XILINX=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_NET=y
@ -28,6 +26,10 @@ CONFIG_IP_PNP_DHCP=y
CONFIG_IP_PNP_BOOTP=y
CONFIG_IP_PNP_RARP=y
CONFIG_NETLINK_DIAG=y
CONFIG_PCI=y
CONFIG_PCIEPORTBUS=y
CONFIG_PCI_HOST_GENERIC=y
CONFIG_PCIE_XILINX=y
CONFIG_DEVTMPFS=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_VIRTIO_BLK=y
@ -63,7 +65,6 @@ CONFIG_USB_STORAGE=y
CONFIG_USB_UAS=y
CONFIG_VIRTIO_MMIO=y
CONFIG_SIFIVE_PLIC=y
CONFIG_RAS=y
CONFIG_EXT4_FS=y
CONFIG_EXT4_FS_POSIX_ACL=y
CONFIG_AUTOFS4_FS=y
@ -77,5 +78,6 @@ CONFIG_NFS_V4_1=y
CONFIG_NFS_V4_2=y
CONFIG_ROOT_NFS=y
CONFIG_CRYPTO_USER_API_HASH=y
CONFIG_CRYPTO_DEV_VIRTIO=y
CONFIG_PRINTK_TIME=y
# CONFIG_RCU_TRACE is not set

2
arch/riscv/include/asm/page.h
View File

@ -80,7 +80,7 @@ typedef struct page *pgtable_t;
#define __pgd(x) ((pgd_t) { (x) })
#define __pgprot(x) ((pgprot_t) { (x) })
#ifdef CONFIG_64BITS
#ifdef CONFIG_64BIT
#define PTE_FMT "%016lx"
#else
#define PTE_FMT "%08lx"

2
arch/riscv/include/asm/processor.h
View File

@ -22,7 +22,7 @@
* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE >> 1)
#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX STACK_TOP

1
arch/riscv/kernel/asm-offsets.c
View File

@ -39,6 +39,7 @@ void asm_offsets(void)
OFFSET(TASK_STACK, task_struct, stack);
OFFSET(TASK_TI, task_struct, thread_info);
OFFSET(TASK_TI_FLAGS, task_struct, thread_info.flags);
OFFSET(TASK_TI_PREEMPT_COUNT, task_struct, thread_info.preempt_count);
OFFSET(TASK_TI_KERNEL_SP, task_struct, thread_info.kernel_sp);
OFFSET(TASK_TI_USER_SP, task_struct, thread_info.user_sp);
OFFSET(TASK_TI_CPU, task_struct, thread_info.cpu);

18
arch/riscv/kernel/entry.S
View File

@ -144,6 +144,10 @@ _save_context:
REG_L x2, PT_SP(sp)
.endm
#if !IS_ENABLED(CONFIG_PREEMPT)
.set resume_kernel, restore_all
#endif
ENTRY(handle_exception)
SAVE_ALL
@ -228,7 +232,7 @@ ret_from_exception:
REG_L s0, PT_SSTATUS(sp)
csrc sstatus, SR_SIE
andi s0, s0, SR_SPP
bnez s0, restore_all
bnez s0, resume_kernel
resume_userspace:
/* Interrupts must be disabled here so flags are checked atomically */
@ -250,6 +254,18 @@ restore_all:
RESTORE_ALL
sret
#if IS_ENABLED(CONFIG_PREEMPT)
resume_kernel:
REG_L s0, TASK_TI_PREEMPT_COUNT(tp)
bnez s0, restore_all
need_resched:
REG_L s0, TASK_TI_FLAGS(tp)
andi s0, s0, _TIF_NEED_RESCHED
beqz s0, restore_all
call preempt_schedule_irq
j need_resched
#endif
work_pending:
/* Enter slow path for supplementary processing */
la ra, ret_from_exception

2
arch/riscv/kernel/setup.c
View File

@ -181,7 +181,7 @@ static void __init setup_bootmem(void)
BUG_ON(mem_size == 0);
set_max_mapnr(PFN_DOWN(mem_size));
max_low_pfn = memblock_end_of_DRAM();
max_low_pfn = PFN_DOWN(memblock_end_of_DRAM());
#ifdef CONFIG_BLK_DEV_INITRD
setup_initrd();

6
arch/riscv/kernel/smpboot.c
View File

@ -57,15 +57,12 @@ void __init setup_smp(void)
while ((dn = of_find_node_by_type(dn, "cpu"))) {
hart = riscv_of_processor_hartid(dn);
if (hart < 0) {
of_node_put(dn);
if (hart < 0)
continue;
}
if (hart == cpuid_to_hartid_map(0)) {
BUG_ON(found_boot_cpu);
found_boot_cpu = 1;
of_node_put(dn);
continue;
}
@ -73,7 +70,6 @@ void __init setup_smp(void)
set_cpu_possible(cpuid, true);
set_cpu_present(cpuid, true);
cpuid++;
of_node_put(dn);
}
BUG_ON(!found_boot_cpu);

3
arch/riscv/mm/init.c
View File

@ -28,7 +28,8 @@ static void __init zone_sizes_init(void)
unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
#ifdef CONFIG_ZONE_DMA32
max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G, max_low_pfn));
max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G,
(unsigned long) PFN_PHYS(max_low_pfn)));
#endif
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;

13
drivers/tty/serial/earlycon-riscv-sbi.c
View File

@ -10,13 +10,16 @@
#include <linux/serial_core.h>
#include <asm/sbi.h>
static void sbi_console_write(struct console *con,
const char *s, unsigned int n)
static void sbi_putc(struct uart_port *port, int c)
{
int i;
sbi_console_putchar(c);
}
for (i = 0; i < n; ++i)
sbi_console_putchar(s[i]);
static void sbi_console_write(struct console *con,
const char *s, unsigned n)
{
struct earlycon_device *dev = con->data;
uart_console_write(&dev->port, s, n, sbi_putc);
}
static int __init early_sbi_setup(struct earlycon_device *device,