[PATCH] kexec/ppc64: Fix up ELF header and dt for PowerNV platform.
Simon Horman
horms at verge.net.au
Wed May 14 21:54:26 PDT 2014
On Mon, May 12, 2014 at 09:54:04AM +0530, Mahesh Jagannath Salgaonkar wrote:
> On 05/11/2014 05:21 AM, Simon Horman wrote:
> > On Sun, Feb 09, 2014 at 10:24:59PM +0530, Mahesh J Salgaonkar wrote:
> >> From: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>
> >>
> >> On PowerNV platform, OPAL region is overlapped with crashkernel, need to
> >> create ELF Program header for the overlapped memory. The changes are
> >> similar to the way RTAS region was handled.
> >>
> >> Signed-off-by: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>
> >
> > I apologise that this seems to have slipped through the cracks.
> > Manesh, is this patch still needed?
>
> Yes. We still need this patch.
Thanks, applied.
Sorry once again for the delay.
>
> If so, is it possible for
> > someone on the power side of things to review it?
> >
> >> ---
> >> kexec/arch/ppc/crashdump-powerpc.h | 2 ++
> >> kexec/arch/ppc64/crashdump-ppc64.c | 28 +++++++++++++++++++++++
> >> kexec/arch/ppc64/crashdump-ppc64.h | 2 ++
> >> kexec/arch/ppc64/kexec-ppc64.c | 44 +++++++++++++++++++++++++++++++++++-
> >> kexec/fs2dt.c | 4 +++
> >> 5 files changed, 79 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/kexec/arch/ppc/crashdump-powerpc.h b/kexec/arch/ppc/crashdump-powerpc.h
> >> index efdc7e3..9b9b01e 100644
> >> --- a/kexec/arch/ppc/crashdump-powerpc.h
> >> +++ b/kexec/arch/ppc/crashdump-powerpc.h
> >> @@ -40,6 +40,8 @@ extern unsigned long long crash_base;
> >> extern unsigned long long crash_size;
> >> extern unsigned int rtas_base;
> >> extern unsigned int rtas_size;
> >> +extern uint64_t opal_base;
> >> +extern uint64_t opal_size;
> >> extern uint64_t memory_limit;
> >>
> >> #endif /* CRASHDUMP_POWERPC_H */
> >> diff --git a/kexec/arch/ppc64/crashdump-ppc64.c b/kexec/arch/ppc64/crashdump-ppc64.c
> >> index c0d575d..00a0e63 100644
> >> --- a/kexec/arch/ppc64/crashdump-ppc64.c
> >> +++ b/kexec/arch/ppc64/crashdump-ppc64.c
> >> @@ -294,6 +294,34 @@ static int get_crash_memory_ranges(struct memory_range **range, int *ranges)
> >> crash_memory_range[memory_ranges++].end = cend;
> >> }
> >>
> >> + /*
> >> + * If OPAL region is overlapped with crashkernel, need to create ELF
> >> + * Program header for the overlapped memory.
> >> + */
> >> + if (crash_base < opal_base + opal_size &&
> >> + opal_base < crash_base + crash_size) {
> >> + page_size = getpagesize();
> >> + cstart = opal_base;
> >> + cend = opal_base + opal_size;
> >> + if (cstart < crash_base)
> >> + cstart = crash_base;
> >> + if (cend > crash_base + crash_size)
> >> + cend = crash_base + crash_size;
> >> + /*
> >> + * The opal section created here is formed by reading opal-base
> >> + * and opal-size from /proc/device-tree/ibm,opal. Unfortunately
> >> + * opal-size is not required to be a multiple of PAGE_SIZE
> >> + * The remainder of the page it ends on is just garbage, and is
> >> + * safe to read, its just not accounted in opal-size. Since
> >> + * we're creating an elf section here though, lets round it up
> >> + * to the next page size boundary though, so makedumpfile can
> >> + * read it safely without going south on us.
> >> + */
> >> + cend = _ALIGN(cend, page_size);
> >> +
> >> + crash_memory_range[memory_ranges].start = cstart;
> >> + crash_memory_range[memory_ranges++].end = cend;
> >> + }
> >> *range = crash_memory_range;
> >> *ranges = memory_ranges;
> >>
> >> diff --git a/kexec/arch/ppc64/crashdump-ppc64.h b/kexec/arch/ppc64/crashdump-ppc64.h
> >> index 001be3a..d654c6b 100644
> >> --- a/kexec/arch/ppc64/crashdump-ppc64.h
> >> +++ b/kexec/arch/ppc64/crashdump-ppc64.h
> >> @@ -31,6 +31,8 @@ extern uint64_t crash_size;
> >> extern uint64_t memory_limit;
> >> extern unsigned int rtas_base;
> >> extern unsigned int rtas_size;
> >> +extern uint64_t opal_base;
> >> +extern uint64_t opal_size;
> >>
> >> uint64_t lmb_size;
> >> unsigned int num_of_lmbs;
> >> diff --git a/kexec/arch/ppc64/kexec-ppc64.c b/kexec/arch/ppc64/kexec-ppc64.c
> >> index 49b291d..5956836 100644
> >> --- a/kexec/arch/ppc64/kexec-ppc64.c
> >> +++ b/kexec/arch/ppc64/kexec-ppc64.c
> >> @@ -43,6 +43,7 @@ uint64_t memory_limit;
> >> static int nr_memory_ranges, nr_exclude_ranges;
> >> uint64_t crash_base, crash_size;
> >> unsigned int rtas_base, rtas_size;
> >> +uint64_t opal_base, opal_size;
> >> int max_memory_ranges;
> >>
> >> static void cleanup_memory_ranges(void)
> >> @@ -343,7 +344,8 @@ static int get_devtree_details(unsigned long kexec_flags)
> >> strncmp(dentry->d_name, "memory@", 7) &&
> >> strcmp(dentry->d_name, "memory") &&
> >> strncmp(dentry->d_name, "pci@", 4) &&
> >> - strncmp(dentry->d_name, "rtas", 4))
> >> + strncmp(dentry->d_name, "rtas", 4) &&
> >> + strncmp(dentry->d_name, "ibm,opal", 8))
> >> continue;
> >> strcpy(fname, device_tree);
> >> strcat(fname, dentry->d_name);
> >> @@ -575,6 +577,46 @@ static int get_devtree_details(unsigned long kexec_flags)
> >> add_usable_mem_rgns(rtas_base, rtas_size);
> >> } /* rtas */
> >>
> >> + if (strncmp(dentry->d_name, "ibm,opal", 8) == 0) {
> >> + strcat(fname, "/opal-base-address");
> >> + file = fopen(fname, "r");
> >> + if (file == NULL) {
> >> + perror(fname);
> >> + goto error_opencdir;
> >> + }
> >> + if (fread(&opal_base, sizeof(uint64_t), 1, file) != 1) {
> >> + perror(fname);
> >> + goto error_openfile;
> >> + }
> >> + opal_base = be64_to_cpu(opal_base);
> >> + fclose(file);
> >> +
> >> + memset(fname, 0, sizeof(fname));
> >> + strcpy(fname, device_tree);
> >> + strcat(fname, dentry->d_name);
> >> + strcat(fname, "/opal-runtime-size");
> >> + file = fopen(fname, "r");
> >> + if (file == NULL) {
> >> + perror(fname);
> >> + goto error_opencdir;
> >> + }
> >> + if (fread(&opal_size, sizeof(uint64_t), 1, file) != 1) {
> >> + perror(fname);
> >> + goto error_openfile;
> >> + }
> >> + fclose(file);
> >> + closedir(cdir);
> >> + opal_size = be64_to_cpu(opal_size);
> >> + /* Add OPAL to exclude_range */
> >> + exclude_range[i].start = opal_base;
> >> + exclude_range[i].end = opal_base + opal_size;
> >> + i++;
> >> + if (i >= max_memory_ranges)
> >> + realloc_memory_ranges();
> >> + if (kexec_flags & KEXEC_ON_CRASH)
> >> + add_usable_mem_rgns(opal_base, opal_size);
> >> + } /* ibm,opal */
> >> +
> >> if (!strncmp(dentry->d_name, "memory@", 7) ||
> >> !strcmp(dentry->d_name, "memory")) {
> >> strcat(fname, "/reg");
> >> diff --git a/kexec/fs2dt.c b/kexec/fs2dt.c
> >> index 5e6b98d..44510cb 100644
> >> --- a/kexec/fs2dt.c
> >> +++ b/kexec/fs2dt.c
> >> @@ -113,6 +113,10 @@ static void checkprop(char *name, unsigned *data, int len)
> >> die("unrecoverable error: no property data");
> >> else if (!strcmp(name, "linux,rtas-base"))
> >> base = be32_to_cpu(*data);
> >> + else if (!strcmp(name, "opal-base-address"))
> >> + base = be64_to_cpu(*(unsigned long long *)data);
> >> + else if (!strcmp(name, "opal-runtime-size"))
> >> + size = be64_to_cpu(*(unsigned long long *)data);
> >> else if (!strcmp(name, "linux,tce-base"))
> >> base = be64_to_cpu(*(unsigned long long *) data);
> >> else if (!strcmp(name, "rtas-size") ||
> >>
> >
>
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