On Fri, Feb 28, 2020 at 2:52 PM Christophe Leroy
<christophe.leroy@xxxxxx> wrote:
>
>
>
> Le 28/02/2020 à 06:53, Pingfan Liu a écrit :
> > At present, plpar_hcall(H_SCM_BIND_MEM, ...) takes a very long time, so
> > if dumping to fsdax, it will take a very long time.
> >
> > Take a closer look, during the papr_scm initialization, the only
> > configuration is through drc_pmem_bind()-> plpar_hcall(H_SCM_BIND_MEM,
> > ...), which helps to set up the bound address.
> >
> > On pseries, for kexec -l/-p kernel, there is no reset of hardware, and this
> > step can be stepped around to save times. So the pmem bound address can be
> > passed to the 2nd kernel through a dynamic added property "bound-addr" in
> > dt node 'ibm,pmemory'.
> >
> > Signed-off-by: Pingfan Liu <kernelfans@xxxxxxxxx>
> > To: linuxppc-dev@xxxxxxxxxxxxxxxx
> > Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> > Cc: Paul Mackerras <paulus@xxxxxxxxx>
> > Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
> > Cc: Hari Bathini <hbathini@xxxxxxxxxxxxx>
> > Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
> > Cc: Oliver O'Halloran <oohall@xxxxxxxxx>
> > Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> > Cc: kexec@xxxxxxxxxxxxxxxxxxx
> > ---
> > note: I can not find such a pseries machine, and not finish it yet.
> > ---
> > arch/powerpc/platforms/pseries/papr_scm.c | 32 +++++++++++++++++++++----------
> > 1 file changed, 22 insertions(+), 10 deletions(-)
> >
> > diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
> > index c2ef320..555e746 100644
> > --- a/arch/powerpc/platforms/pseries/papr_scm.c
> > +++ b/arch/powerpc/platforms/pseries/papr_scm.c
> > @@ -382,7 +382,7 @@ static int papr_scm_probe(struct platform_device *pdev)
> > {
> > struct device_node *dn = pdev->dev.of_node;
> > u32 drc_index, metadata_size;
> > - u64 blocks, block_size;
> > + u64 blocks, block_size, bound_addr = 0;
> > struct papr_scm_priv *p;
> > const char *uuid_str;
> > u64 uuid[2];
> > @@ -439,17 +439,29 @@ static int papr_scm_probe(struct platform_device *pdev)
> > p->metadata_size = metadata_size;
> > p->pdev = pdev;
> >
> > - /* request the hypervisor to bind this region to somewhere in memory */
> > - rc = drc_pmem_bind(p);
> > + of_property_read_u64(dn, "bound-addr", &bound_addr);
> > + if (bound_addr)
> > + p->bound_addr = bound_addr;
> > + else {
>
> All legs of an if/else must have { } when one leg need them, see codying
> style.
OK,
>
> > + struct property *property;
> > + u64 big;
> >
> > - /* If phyp says drc memory still bound then force unbound and retry */
> > - if (rc == H_OVERLAP)
> > - rc = drc_pmem_query_n_bind(p);
> > + /* request the hypervisor to bind this region to somewhere in memory */
> > + rc = drc_pmem_bind(p);
> >
> > - if (rc != H_SUCCESS) {
> > - dev_err(&p->pdev->dev, "bind err: %d\n", rc);
> > - rc = -ENXIO;
> > - goto err;
> > + /* If phyp says drc memory still bound then force unbound and retry */
> > + if (rc == H_OVERLAP)
> > + rc = drc_pmem_query_n_bind(p);
> > +
> > + if (rc != H_SUCCESS) {
> > + dev_err(&p->pdev->dev, "bind err: %d\n", rc);
> > + rc = -ENXIO;
> > + goto err;
> > + }
> > + big = cpu_to_be64(p->bound_addr);
> > + property = new_property("bound-addr", sizeof(u64), &big,
> > + NULL);
>
> Why plitting this line in two parts ? You have lines far longer above.
> In powerpc we allow lines 90 chars long.
OK, good to know it.
Thanks,
Pingfan
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