#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>
/* 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 */
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);