On Tuesday 29 August 2006 01:46, Zou Nan hai wrote:
> +#ifdef CONFIG_KEXEC
> +void
> +ioc_iova_disable(void)
> +{
Ugh. If you really need this functionality (which I have to say looks
like a band-aid), it probably should be a platform vector. And should
be split into a separate patch.
> + struct ioc *ioc;
> +
> + ioc = ioc_list;
> +
> + while (ioc != NULL) {
> + /* Disable IOVA translation */
> + WRITE_REG(ioc->ibase & 0xfffffffffffffffe, ioc->ioc_hpa +
> IOC_IBASE);
> + READ_REG(ioc->ioc_hpa + IOC_IBASE);
> +
> + /* Clear I/O TLB of any possible entries */
> + WRITE_REG(ioc->ibase | (get_iovp_order(ioc->iov_size) +
> iovp_shift), ioc->ioc_hpa + IOC_PCOM);
> + READ_REG(ioc->ioc_hpa + IOC_PCOM);
This will just make any future device DMA attempts fail with an MCA,
won't it? What problem does that solve? Don't you need the same
for other IOMMUs like SGI's?
> +config KEXEC
> + bool "kexec system call (EXPERIMENTAL)"
> + depends on EXPERIMENTAL
> + help
> + kexec is a system call that implements the ability to shutdown your
> + current kernel, and to start another kernel. It is like a reboot
> + but it is indepedent of the system firmware. And like a reboot
independent
> + you can start any kernel with it, not just Linux.
> +
> + The name comes from the similiarity to the exec system call.
similarity
> +size_t copy_oldmem_page(unsigned long pfn, char *buf,
> + size_t csize, unsigned long offset, int
> userbuf)
Doesn't seem to be used.
> +static void device_shootdown(void)
> +{
> + kdump_disable_iosapic();
> +#ifdef CONFIG_IA64_HP_ZX1
> + ioc_iova_disable();
> +#endif
Seems like sort of a heavy-handed way to shut down devices. But maybe
you don't have any alternatives, I don't know. I guess you don't do
the pci_disable_device() thing here just to avoid depending on more
code?
> +}
> +
> +static inline Elf64_Word
> +*append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
> + size_t data_len)
> +{
All this ELF stuff looks like something that could be split into
a separate patch.
> + ia64_dump_cpu_regs(dst);
> + cfm = dst[43];
> + sol = (cfm >> 7) & 0x7f;
> + sof = cfm & 0x7f;
> + dst[46] = (unsigned long)ia64_rse_skip_regs((unsigned long *)dst[46],
> + sof - sol);
> +
> + buf = (u64 *) per_cpu_ptr(crash_notes, cpu);
Funny indentation above (spaces rather than tab, I guess).
> -static unsigned long mem_limit = ~0UL, max_addr = ~0UL;
> +static unsigned long mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
>
> #define efi_call_virt(f, args...) (*(f))(args)
>
> @@ -421,6 +422,8 @@ efi_init (void)
> mem_limit = memparse(cp + 4, &cp);
> } else if (memcmp(cp, "max_addr=", 9) == 0) {
> max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
> + } else if (memcmp(cp, "min_addr=", 9) == 0) {
> + min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
min_addr= looks like it could be a separate patch.
> +#ifdef CONFIG_CRASH_DUMP
> +void
> +kdump_disable_iosapic(void)
> +{
> + u32 low32;
> + struct iosapic_intr_info *info;
> + struct iosapic_rte_info *rte;
> + for (info = iosapic_intr_info; info <
> + iosapic_intr_info + IA64_NUM_VECTORS; ++info) {
> + low32 = info->low32 |= IOSAPIC_MASK;
> + list_for_each_entry(rte, &info->rtes,
> + rte_list) {
> + iosapic_write(rte->addr,
> + IOSAPIC_RTE_LOW(rte->rte_index), low32);
> + }
> + }
> +}
> +#endif
Disabling the iosapic could be a separate patch.
> +/*
> + * Do what every setup is needed on image and the
ever
> +#ifdef CONFIG_KEXEC
> + /* [EMAIL PROTECTED] specifies the location to reserve for
> + * a crash kernel. By reserving this memory we guarantee
> + * that linux never set's it up as a DMA target.
sets, or better, s/set's it up/uses it/
> + * Useful for holding code to do something appropriate
> + * after a kernel panic.
> + */
> + {
> + char *from = strstr(saved_command_line, "crashkernel=");
crashkernel= looks like it could be a separate patch.
> + char *from = strstr(saved_command_line, "elfcorehdr=");
> +
> + if (from)
> + elfcorehdr_addr = memparse(from+11, &from);
elfcorehdr_addr isn't referenced anywhere else.
> diff -Nraup linux-2.6.18-rc5/kernel/irq/manage.c
> linux-2.6.18-rc5-kdump/kernel/irq/manage.c
> --- linux-2.6.18-rc5/kernel/irq/manage.c 2006-08-30 11:37:00.000000000
> +0800
> +++ linux-2.6.18-rc5-kdump/kernel/irq/manage.c 2006-08-30
> 10:34:25.000000000 +0800
> @@ -475,4 +475,3 @@ int request_irq(unsigned int irq,
> return retval;
> }
> EXPORT_SYMBOL(request_irq);
> -
Extraneous whitespace change.
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