From: David Gibson <david@gibson.dropbear.id.au>
To: Michael Roth <mdroth@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org,
Michael Ellerman <mpe@ellerman.id.au>,
Nathan Fontenot <nfont@linux.vnet.ibm.com>
Subject: Re: [PATCH] powerpc/pseries: advertise Hot Plug Event support to firmware
Date: Wed, 22 Feb 2017 11:58:47 +1100 [thread overview]
Message-ID: <20170222005847.GC12577@umbus.fritz.box> (raw)
In-Reply-To: <1487639538-25922-1-git-send-email-mdroth@linux.vnet.ibm.com>
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On Mon, Feb 20, 2017 at 07:12:18PM -0600, Michael Roth wrote:
> With the inclusion of:
>
> powerpc/pseries: Implement indexed-count hotplug memory remove
> powerpc/pseries: Implement indexed-count hotplug memory add
>
> we now have complete handling of the RTAS hotplug event format
> as described by PAPR via ACR "PAPR Changes for Hotplug RTAS Events".
>
> This capability is indicated by byte 6, bit 5 of architecture
> option vector 5, and allows for greater control over cpu/memory/pci
> hot plug/unplug operations.
>
> Existing pseries kernels will utilize this capability based on the
> existence of the /event-sources/hot-plug-events DT property, so we
> only need to advertise it via CAS and do not need a corresponding
> FW_FEATURE_* value to test for.
>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
> Cc: David Gibson <david@gibson.dropbear.id.au>
> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> ---
> arch/powerpc/include/asm/prom.h | 1 +
> arch/powerpc/kernel/prom_init.c | 2 +-
> 2 files changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h
> index 2c8001c..4a90634 100644
> --- a/arch/powerpc/include/asm/prom.h
> +++ b/arch/powerpc/include/asm/prom.h
> @@ -153,6 +153,7 @@ struct of_drconf_cell {
> #define OV5_XCMO 0x0440 /* Page Coalescing */
> #define OV5_TYPE1_AFFINITY 0x0580 /* Type 1 NUMA affinity */
> #define OV5_PRRN 0x0540 /* Platform Resource Reassignment */
> +#define OV5_HP_EVT 0x0604 /* Hot Plug Event support */
> #define OV5_RESIZE_HPT 0x0601 /* Hash Page Table resizing */
> #define OV5_PFO_HW_RNG 0x1180 /* PFO Random Number Generator */
> #define OV5_PFO_HW_842 0x1140 /* PFO Compression Accelerator */
> diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
> index f3c8799..1a835e7 100644
> --- a/arch/powerpc/kernel/prom_init.c
> +++ b/arch/powerpc/kernel/prom_init.c
> @@ -839,7 +839,7 @@ struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
> 0,
> #endif
> .associativity = OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
> - .bin_opts = OV5_FEAT(OV5_RESIZE_HPT),
> + .bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT),
> .micro_checkpoint = 0,
> .reserved0 = 0,
> .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2017-02-22 1:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-21 1:12 [PATCH] powerpc/pseries: advertise Hot Plug Event support to firmware Michael Roth
2017-02-21 15:49 ` Nathan Fontenot
2017-02-22 0:58 ` David Gibson [this message]
2017-02-27 10:11 ` Michael Ellerman
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