On Mon, Mar 03, 2025 at 10:19:22PM +0530, Avnish Chouhan wrote:
> Change RMA size from 512 MB to 768 MB which will result
> in more memory at boot time for PowerPC. When vTPM, Secure Boot or
> FADump are enabled on PowerPC, the 512 MB RMA memory is not sufficient for
> booting. With this 512 MB RMA, GRUB2 runs out of memory and fails to
> boot the machine. Sometimes even usage of CDROM which requires more
s/which//
> memory for installation along with the options mentioned above troubles
s/installation along/installation and along/
s/troubles/exhausts/
> the boot memory and result in boot failures. Increasing the RMA size
s/and result/which results/
> will resolves multiple out of memory issues observed in PowerPC.
>
> Failure details (GRUB2 debugs):
>
> kern/ieee1275/init.c:550: mm requested region of size 8513000, flags 1
> kern/ieee1275/init.c:563: Cannot satisfy allocation and retain minimum
> runtime space
> kern/ieee1275/init.c:550: mm requested region of size 8513000, flags 0
> kern/ieee1275/init.c:563: Cannot satisfy allocation and retain minimum
> runtime space
> kern/file.c:215: Closing `/ppc/ppc64/initrd.img' ...
> kern/disk.c:297: Closing
> `ieee1275//vdevice/v-scsi@30000067/disk@8300000000000000'...
> kern/disk.c:311: Closing
> `ieee1275//vdevice/v-scsi@30000067/disk@8300000000000000' succeeded.
> kern/file.c:225: Closing `/ppc/ppc64/initrd.img' failed with 3.
> kern/file.c:148: Opening `/ppc/ppc64/initrd.img' succeeded.
> error: ../../grub-core/kern/mm.c:552:out of memory.
>
> Signed-off-by: Avnish Chouhan <avn...@linux.ibm.com>
> ---
> grub-core/kern/ieee1275/init.c | 31 +++++++++++++++++++++++++++----
> 1 file changed, 27 insertions(+), 4 deletions(-)
>
> diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c
> index dfbd0b8..34e9e13 100644
> --- a/grub-core/kern/ieee1275/init.c
> +++ b/grub-core/kern/ieee1275/init.c
> @@ -852,7 +852,7 @@ grub_ieee1275_ibm_cas (void)
> .vec1 = 0x80, /* ignore */
> .vec2_size = 1 + sizeof (struct option_vector2) - 2,
> .vec2 = {
> - 0, 0, -1, -1, -1, -1, -1, 512, -1, 0, 48
> + 0, 0, -1, -1, -1, -1, -1, 768, -1, 0, 48
> },
> .vec3_size = 2 - 1,
> .vec3 = 0x00e0, /* ask for FP + VMX + DFP but don't halt if unsatisfied
> */
> @@ -889,6 +889,10 @@ grub_claim_heap (void)
> {
> grub_err_t err;
> grub_uint32_t total = HEAP_MAX_SIZE;
> +#if defined(__powerpc__)
> + grub_uint32_t ibm_ca_support_reboot = 0;
> + grub_ssize_t actual;
> +#endif
>
> err = grub_ieee1275_total_mem (&rmo_top);
>
> @@ -901,11 +905,30 @@ grub_claim_heap (void)
> grub_mm_add_region_fn = grub_ieee1275_mm_add_region;
>
> #if defined(__powerpc__)
> + /* Check if it's a CAS reboot with below property. If so, we will skip CAS
> call */
> + if (grub_ieee1275_get_integer_property (grub_ieee1275_chosen,
> +
> "ibm,client-architecture-support-reboot",
> + &ibm_ca_support_reboot,
> + sizeof (ibm_ca_support_reboot),
> + &actual) >= 0)
> + grub_dprintf ("ieee1275", "ibm,client-architecture-support-reboot: %u\n",
> + ibm_ca_support_reboot);
> +
> if (grub_ieee1275_test_flag
> (GRUB_IEEE1275_FLAG_CAN_TRY_CAS_FOR_MORE_MEMORY))
> {
> - /* if we have an error, don't call CAS, just hope for the best */
> - if (err == GRUB_ERR_NONE && rmo_top < (512 * 1024 * 1024))
> - grub_ieee1275_ibm_cas ();
> + /*
> + * If we have an error or the reboot is detected as CAS reboot,
> + * don't call CAS, just hope for the best.
> + * Along with the above, if the rmo_top is 512 MB or above. We
> + * will skip the CAS call. Though if we call CAS, the rmo_top will
> + * be set to 768 MB via CAS Vector2. This condition is required to
> avoid the
> + * issue where the older Linux kernels are still using rmo_top as 512
> MB.
> + * If we call CAS where rmo_top is less then 768 MB, this will result
> in an issue
> + * due to IBM CAS reboot feature and we won't be able to boot the
> newer kernel.
Could you be more specific? What is "an issue due to IBM CAS reboot feature"?
And I think it would be nice if you put here a reference to documentation,
including chapters names, etc., which discuss RMA and issues fixed here.
> + * The machine will boot with the last booted kernel which has rmo_top
> as 512 MB.
> + */
> + if (!ibm_ca_support_reboot && err == GRUB_ERR_NONE && rmo_top < (512 *
> 1024 * 1024))
> + grub_ieee1275_ibm_cas ();
> }
> #endif
Daniel
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