From: Nicholas Piggin <npiggin@gmail.com>
To: Haren Myneni <haren@linux.ibm.com>,
herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au
Cc: haren@us.ibm.com, hbabu@us.ibm.com
Subject: Re: [PATCH v6 11/17] powerpc/pseries/vas: Implement getting capabilities from hypervisor
Date: Fri, 18 Jun 2021 09:24:42 +1000 [thread overview]
Message-ID: <1623972214.66b5w89bfe.astroid@bobo.none> (raw)
In-Reply-To: <177c88608cb88f7b87d1c546103f18cec6c056b4.camel@linux.ibm.com>
Excerpts from Haren Myneni's message of June 18, 2021 6:35 am:
>
> The hypervisor provides VAS capabilities for GZIP default and QoS
> features. These capabilities gives information for the specific
> features such as total number of credits available in LPAR,
> maximum credits allowed per window, maximum credits allowed in
> LPAR, whether usermode copy/paste is supported, and etc.
>
> This patch adds the following:
> - Retrieve all features that are provided by hypervisor using
> H_QUERY_VAS_CAPABILITIES hcall with 0 as feature type.
> - Retrieve capabilities for the specific feature using the same
> hcall and the feature type (1 for QoS and 2 for default type).
>
> Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
> ---
> arch/powerpc/platforms/pseries/vas.c | 122 +++++++++++++++++++++++++++
> 1 file changed, 122 insertions(+)
>
> diff --git a/arch/powerpc/platforms/pseries/vas.c b/arch/powerpc/platforms/pseries/vas.c
> index a73d7d00bf55..93794e12527d 100644
> --- a/arch/powerpc/platforms/pseries/vas.c
> +++ b/arch/powerpc/platforms/pseries/vas.c
> @@ -10,6 +10,7 @@
> #include <linux/export.h>
> #include <linux/types.h>
> #include <linux/delay.h>
> +#include <asm/machdep.h>
> #include <asm/hvcall.h>
> #include <asm/plpar_wrappers.h>
> #include <asm/vas.h>
> @@ -20,6 +21,11 @@
> /* The hypervisor allows one credit per window right now */
> #define DEF_WIN_CREDS 1
>
> +static struct vas_all_caps caps_all;
> +static bool copypaste_feat;
> +
> +static struct vas_caps vascaps[VAS_MAX_FEAT_TYPE];
> +
> static long hcall_return_busy_check(long rc)
> {
> /* Check if we are stalled for some time */
> @@ -145,3 +151,119 @@ int h_query_vas_capabilities(const u64 hcall, u8 query_type, u64 result)
> hcall, rc, query_type, result);
> return -EIO;
> }
> +
> +/*
> + * Get the specific capabilities based on the feature type.
> + * Right now supports GZIP default and GZIP QoS capabilities.
> + */
> +static int get_vas_capabilities(u8 feat, enum vas_cop_feat_type type,
> + struct hv_vas_cop_feat_caps *hv_caps)
> +{
> + struct vas_cop_feat_caps *caps;
> + struct vas_caps *vcaps;
> + int rc = 0;
> +
> + vcaps = &vascaps[type];
> + memset(vcaps, 0, sizeof(*vcaps));
> + INIT_LIST_HEAD(&vcaps->list);
> +
> + caps = &vcaps->caps;
> +
> + rc = h_query_vas_capabilities(H_QUERY_VAS_CAPABILITIES, feat,
> + (u64)virt_to_phys(hv_caps));
> + if (rc)
> + return rc;
> +
> + caps->user_mode = hv_caps->user_mode;
> + if (!(caps->user_mode & VAS_COPY_PASTE_USER_MODE)) {
> + pr_err("User space COPY/PASTE is not supported\n");
> + return -ENOTSUPP;
> + }
> +
> + caps->descriptor = be64_to_cpu(hv_caps->descriptor);
> + caps->win_type = hv_caps->win_type;
> + if (caps->win_type >= VAS_MAX_FEAT_TYPE) {
> + pr_err("Unsupported window type %u\n", caps->win_type);
> + return -EINVAL;
> + }
> + caps->max_lpar_creds = be16_to_cpu(hv_caps->max_lpar_creds);
> + caps->max_win_creds = be16_to_cpu(hv_caps->max_win_creds);
> + atomic_set(&caps->target_lpar_creds,
> + be16_to_cpu(hv_caps->target_lpar_creds));
> + if (feat == VAS_GZIP_DEF_FEAT) {
> + caps->def_lpar_creds = be16_to_cpu(hv_caps->def_lpar_creds);
> +
> + if (caps->max_win_creds < DEF_WIN_CREDS) {
> + pr_err("Window creds(%u) > max allowed window creds(%u)\n",
> + DEF_WIN_CREDS, caps->max_win_creds);
> + return -EINVAL;
> + }
> + }
> +
> + copypaste_feat = true;
> +
> + return 0;
> +}
> +
> +static int __init pseries_vas_init(void)
> +{
> + struct hv_vas_cop_feat_caps *hv_cop_caps;
> + struct hv_vas_all_caps *hv_caps;
> + int rc;
> +
> + /*
> + * Linux supports user space COPY/PASTE only with Radix
> + */
> + if (!radix_enabled()) {
> + pr_err("API is supported only with radix page tables\n");
> + return -ENOTSUPP;
> + }
> +
> + hv_caps = kmalloc(sizeof(*hv_caps), GFP_KERNEL);
> + if (!hv_caps)
> + return -ENOMEM;
> + /*
> + * Get VAS overall capabilities by passing 0 to feature type.
> + */
> + rc = h_query_vas_capabilities(H_QUERY_VAS_CAPABILITIES, 0,
> + (u64)virt_to_phys(hv_caps));
> + if (rc)
> + goto out;
> +
> + caps_all.descriptor = be64_to_cpu(hv_caps->descriptor);
> + caps_all.feat_type = be64_to_cpu(hv_caps->feat_type);
> +
> + hv_cop_caps = kmalloc(sizeof(*hv_cop_caps), GFP_KERNEL);
> + if (!hv_cop_caps) {
> + rc = -ENOMEM;
> + goto out;
> + }
> + /*
> + * QOS capabilities available
> + */
> + if (caps_all.feat_type & VAS_GZIP_QOS_FEAT_BIT) {
> + rc = get_vas_capabilities(VAS_GZIP_QOS_FEAT,
> + VAS_GZIP_QOS_FEAT_TYPE, hv_cop_caps);
> +
> + if (rc)
> + goto out_cop;
> + }
> + /*
> + * Default capabilities available
> + */
> + if (caps_all.feat_type & VAS_GZIP_DEF_FEAT_BIT) {
> + rc = get_vas_capabilities(VAS_GZIP_DEF_FEAT,
> + VAS_GZIP_DEF_FEAT_TYPE, hv_cop_caps);
> + if (rc)
> + goto out_cop;
> + }
> +
> + pr_info("GZIP feature is available\n");
> +
> +out_cop:
> + kfree(hv_cop_caps);
> +out:
> + kfree(hv_caps);
> + return rc;
> +}
> +machine_device_initcall(pseries, pseries_vas_init);
> --
> 2.18.2
>
>
>
next prev parent reply other threads:[~2021-06-17 23:24 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-17 20:24 [PATCH v6 00/17] Enable VAS and NX-GZIP support on PowerVM Haren Myneni
2021-06-17 20:29 ` [PATCH v6 01/17] powerpc/powernv/vas: Release reference to tgid during window close Haren Myneni
2021-06-17 20:29 ` [PATCH v6 02/17] powerpc/vas: Move VAS API to book3s common platform Haren Myneni
2021-06-17 20:30 ` [PATCH v6 03/17] powerpc/powernv/vas: Rename register/unregister functions Haren Myneni
2021-06-17 20:31 ` [PATCH v6 04/17] powerpc/vas: Add platform specific user window operations Haren Myneni
2021-06-17 23:27 ` Nicholas Piggin
2021-06-17 20:31 ` [PATCH v6 05/17] powerpc/vas: Create take/drop pid and mm reference functions Haren Myneni
2021-06-17 20:32 ` [PATCH v6 06/17] powerpc/vas: Move update_csb/dump_crb to common book3s platform Haren Myneni
2021-06-17 23:10 ` Nicholas Piggin
2021-06-17 20:33 ` [PATCH v6 07/17] powerpc/vas: Define and use common vas_window struct Haren Myneni
2021-06-17 20:34 ` [PATCH v6 08/17] powerpc/pseries/vas: Define VAS/NXGZIP hcalls and structs Haren Myneni
2021-06-17 20:34 ` [PATCH v6 09/17] powerpc/vas: Define QoS credit flag to allocate window Haren Myneni
2021-06-17 20:35 ` [PATCH v6 10/17] powerpc/pseries/vas: Add hcall wrappers for VAS handling Haren Myneni
2021-06-17 20:35 ` [PATCH v6 11/17] powerpc/pseries/vas: Implement getting capabilities from hypervisor Haren Myneni
2021-06-17 23:24 ` Nicholas Piggin [this message]
2021-06-17 20:36 ` [PATCH v6 12/17] powerpc/pseries/vas: Integrate API with open/close windows Haren Myneni
2021-06-17 23:22 ` Nicholas Piggin
2021-06-18 7:49 ` Haren Myneni
2021-06-19 3:22 ` Nicholas Piggin
2021-06-17 20:37 ` [PATCH v6 13/17] powerpc/pseries/vas: Setup IRQ and fault handling Haren Myneni
2021-06-17 23:34 ` Nicholas Piggin
2021-06-18 2:09 ` Haren Myneni
2021-06-19 3:22 ` Nicholas Piggin
2021-06-17 20:37 ` [PATCH v6 14/17] crypto/nx: Rename nx-842-pseries file name to nx-common-pseries Haren Myneni
2021-06-17 20:38 ` [PATCH v6 15/17] crypto/nx: Get NX capabilities for GZIP coprocessor type Haren Myneni
2021-06-17 23:35 ` Nicholas Piggin
2021-06-17 20:39 ` [PATCH v6 16/17] crypto/nx: Add sysfs interface to export NX capabilities Haren Myneni
2021-06-17 23:41 ` Nicholas Piggin
2021-06-17 20:39 ` [PATCH v6 17/17] crypto/nx: Register and unregister VAS interface on PowerVM Haren Myneni
2021-06-24 14:03 ` [PATCH v6 00/17] Enable VAS and NX-GZIP support " Michael Ellerman
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