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authorHaren Myneni <haren@linux.ibm.com>2021-06-17 23:38:36 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2021-06-20 14:58:58 +0300
commitb4ba22114c78de48fda3818f569f75e97d58c719 (patch)
treeed00721cacd8614b2327040496199b5dfad1ccd3 /drivers/crypto
parent7da00b0e71334aa1e3d8db1cc1f40eb47cb1e188 (diff)
downloadlinux-b4ba22114c78de48fda3818f569f75e97d58c719.tar.xz
crypto/nx: Get NX capabilities for GZIP coprocessor type
The hypervisor provides different NX capabilities that it supports. These capabilities such as recommended minimum compression / decompression lengths and the maximum request buffer size in bytes are used to define the user space NX request. NX will reject the request if the buffer size is more than the maximum buffer size. Whereas compression / decompression lengths are recommended values for better performance. Changes to get NX overall capabilities which points to the specific features that the hypervisor supports. Then retrieve the capabilities for the specific feature (available only for NXGZIP). Signed-off-by: Haren Myneni <haren@linux.ibm.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/f2b6a1fb8b6112595a73d81c67a35af4e7f5d0a3.camel@linux.ibm.com
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/nx/nx-common-pseries.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/crypto/nx/nx-common-pseries.c b/drivers/crypto/nx/nx-common-pseries.c
index cc8dd3072b8b..9fc2abb56019 100644
--- a/drivers/crypto/nx/nx-common-pseries.c
+++ b/drivers/crypto/nx/nx-common-pseries.c
@@ -9,6 +9,8 @@
*/
#include <asm/vio.h>
+#include <asm/hvcall.h>
+#include <asm/vas.h>
#include "nx-842.h"
#include "nx_csbcpb.h" /* struct nx_csbcpb */
@@ -19,6 +21,29 @@ MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors");
MODULE_ALIAS_CRYPTO("842");
MODULE_ALIAS_CRYPTO("842-nx");
+/*
+ * Coprocessor type specific capabilities from the hypervisor.
+ */
+struct hv_nx_cop_caps {
+ __be64 descriptor;
+ __be64 req_max_processed_len; /* Max bytes in one GZIP request */
+ __be64 min_compress_len; /* Min compression size in bytes */
+ __be64 min_decompress_len; /* Min decompression size in bytes */
+} __packed __aligned(0x1000);
+
+/*
+ * Coprocessor type specific capabilities.
+ */
+struct nx_cop_caps {
+ u64 descriptor;
+ u64 req_max_processed_len; /* Max bytes in one GZIP request */
+ u64 min_compress_len; /* Min compression in bytes */
+ u64 min_decompress_len; /* Min decompression in bytes */
+};
+
+static u64 caps_feat;
+static struct nx_cop_caps nx_cop_caps;
+
static struct nx842_constraints nx842_pseries_constraints = {
.alignment = DDE_BUFFER_ALIGN,
.multiple = DDE_BUFFER_LAST_MULT,
@@ -1065,6 +1090,64 @@ static void nx842_remove(struct vio_dev *viodev)
kfree(old_devdata);
}
+/*
+ * Get NX capabilities from the hypervisor.
+ * Only NXGZIP capabilities are provided by the hypersvisor right
+ * now and these values are available to user space with sysfs.
+ */
+static void __init nxcop_get_capabilities(void)
+{
+ struct hv_vas_all_caps *hv_caps;
+ struct hv_nx_cop_caps *hv_nxc;
+ int rc;
+
+ hv_caps = kmalloc(sizeof(*hv_caps), GFP_KERNEL);
+ if (!hv_caps)
+ return;
+ /*
+ * Get NX overall capabilities with feature type=0
+ */
+ rc = h_query_vas_capabilities(H_QUERY_NX_CAPABILITIES, 0,
+ (u64)virt_to_phys(hv_caps));
+ if (rc)
+ goto out;
+
+ caps_feat = be64_to_cpu(hv_caps->feat_type);
+ /*
+ * NX-GZIP feature available
+ */
+ if (caps_feat & VAS_NX_GZIP_FEAT_BIT) {
+ hv_nxc = kmalloc(sizeof(*hv_nxc), GFP_KERNEL);
+ if (!hv_nxc)
+ goto out;
+ /*
+ * Get capabilities for NX-GZIP feature
+ */
+ rc = h_query_vas_capabilities(H_QUERY_NX_CAPABILITIES,
+ VAS_NX_GZIP_FEAT,
+ (u64)virt_to_phys(hv_nxc));
+ } else {
+ pr_err("NX-GZIP feature is not available\n");
+ rc = -EINVAL;
+ }
+
+ if (!rc) {
+ nx_cop_caps.descriptor = be64_to_cpu(hv_nxc->descriptor);
+ nx_cop_caps.req_max_processed_len =
+ be64_to_cpu(hv_nxc->req_max_processed_len);
+ nx_cop_caps.min_compress_len =
+ be64_to_cpu(hv_nxc->min_compress_len);
+ nx_cop_caps.min_decompress_len =
+ be64_to_cpu(hv_nxc->min_decompress_len);
+ } else {
+ caps_feat = 0;
+ }
+
+ kfree(hv_nxc);
+out:
+ kfree(hv_caps);
+}
+
static const struct vio_device_id nx842_vio_driver_ids[] = {
{"ibm,compression-v1", "ibm,compression"},
{"", ""},
@@ -1092,6 +1175,10 @@ static int __init nx842_pseries_init(void)
return -ENOMEM;
RCU_INIT_POINTER(devdata, new_devdata);
+ /*
+ * Get NX capabilities from the hypervisor.
+ */
+ nxcop_get_capabilities();
ret = vio_register_driver(&nx842_vio_driver);
if (ret) {