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-rw-r--r--pc-bios/s390-ccw/main.c1
-rw-r--r--pc-bios/s390-ccw/s390-ccw.h1
-rw-r--r--pc-bios/s390-ccw/virtio.c140
-rw-r--r--pc-bios/s390-ccw/virtio.h4
4 files changed, 90 insertions, 56 deletions
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 7f192f3a6d..6bf44a7fa0 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -12,7 +12,6 @@
#include "virtio.h"
char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
-char ring_area[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
uint64_t boot_value;
static SubChannelId blk_schid = { .one = 1 };
diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
index a5c0684c00..3e00d42eb8 100644
--- a/pc-bios/s390-ccw/s390-ccw.h
+++ b/pc-bios/s390-ccw/s390-ccw.h
@@ -61,7 +61,6 @@ void consume_sclp_int(void);
void panic(const char *string);
void write_subsystem_identification(void);
extern char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
-extern char ring_area[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
extern uint64_t boot_value;
/* sclp-ascii.c */
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 64c6e070de..d366aa32e1 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -11,29 +11,35 @@
#include "s390-ccw.h"
#include "virtio.h"
-static VRing block;
+static VRing block[VIRTIO_MAX_VQS];
+static char ring_area[VIRTIO_RING_SIZE * VIRTIO_MAX_VQS]
+ __attribute__((__aligned__(PAGE_SIZE)));
+static int nr_vqs = 1;
static char chsc_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
+/* virtio spec v1.0 para 4.3.3.2 */
static long kvm_hypercall(unsigned long nr, unsigned long param1,
- unsigned long param2)
+ unsigned long param2, unsigned long param3)
{
register ulong r_nr asm("1") = nr;
register ulong r_param1 asm("2") = param1;
register ulong r_param2 asm("3") = param2;
+ register ulong r_param3 asm("4") = param3;
register long retval asm("2");
asm volatile ("diag 2,4,0x500"
: "=d" (retval)
- : "d" (r_nr), "0" (r_param1), "r"(r_param2)
+ : "d" (r_nr), "0" (r_param1), "r"(r_param2), "d"(r_param3)
: "memory", "cc");
return retval;
}
-static void virtio_notify(SubChannelId schid)
+static long virtio_notify(SubChannelId schid, int vq_idx, long cookie)
{
- kvm_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, *(u32 *)&schid, 0);
+ return kvm_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, *(u32 *)&schid,
+ vq_idx, cookie);
}
/***********************************************
@@ -106,15 +112,17 @@ static void virtio_reset(SubChannelId schid)
run_ccw(schid, CCW_CMD_VDEV_RESET, NULL, 0);
}
-static void vring_init(VRing *vr, unsigned int num, void *p,
- unsigned long align)
+static void vring_init(VRing *vr, VqInfo *info)
{
+ void *p = (void *) info->queue;
+
debug_print_addr("init p", p);
- vr->num = num;
+ vr->id = info->index;
+ vr->num = info->num;
vr->desc = p;
- vr->avail = p + num * sizeof(VRingDesc);
- vr->used = (void *)(((unsigned long)&vr->avail->ring[num] + align-1)
- & ~(align - 1));
+ vr->avail = p + info->num * sizeof(VRingDesc);
+ vr->used = (void *)(((unsigned long)&vr->avail->ring[info->num]
+ + info->align - 1) & ~(info->align - 1));
/* Zero out all relevant field */
vr->avail->flags = 0;
@@ -125,13 +133,15 @@ static void vring_init(VRing *vr, unsigned int num, void *p,
vr->used->idx = 0;
vr->used_idx = 0;
vr->next_idx = 0;
+ vr->cookie = 0;
debug_print_addr("init vr", vr);
}
-static void vring_notify(SubChannelId schid)
+static bool vring_notify(VRing *vr)
{
- virtio_notify(schid);
+ vr->cookie = virtio_notify(vr->schid, vr->id, vr->cookie);
+ return vr->cookie >= 0;
}
static void vring_send_buf(VRing *vr, void *p, int len, int flags)
@@ -167,6 +177,21 @@ ulong get_second(void)
return (get_clock() >> 12) / 1000000;
}
+static int vr_poll(VRing *vr)
+{
+ if (vr->used->idx == vr->used_idx) {
+ vring_notify(vr);
+ yield();
+ return 0;
+ }
+
+ vr->used_idx = vr->used->idx;
+ vr->next_idx = 0;
+ vr->desc[0].len = 0;
+ vr->desc[0].flags = 0;
+ return 1; /* vr has been updated */
+}
+
/*
* Wait for the host to reply.
*
@@ -174,28 +199,24 @@ ulong get_second(void)
*
* Returns 0 on success, 1 on timeout.
*/
-static int vring_wait_reply(VRing *vr, int timeout)
+static int vring_wait_reply(int timeout)
{
ulong target_second = get_second() + timeout;
- SubChannelId schid = vr->schid;
- int r = 0;
- /* Wait until the used index has moved. */
- while (vr->used->idx == vr->used_idx) {
- vring_notify(schid);
- if (timeout && (get_second() >= target_second)) {
- r = 1;
- break;
+ /* Wait for any queue to be updated by the host */
+ do {
+ int i, r = 0;
+
+ for (i = 0; i < nr_vqs; i++) {
+ r += vr_poll(&block[i]);
}
yield();
- }
-
- vr->used_idx = vr->used->idx;
- vr->next_idx = 0;
- vr->desc[0].len = 0;
- vr->desc[0].flags = 0;
+ if (r) {
+ return 0;
+ }
+ } while (!timeout || (get_second() < target_second));
- return r;
+ return 1;
}
/***********************************************
@@ -213,21 +234,21 @@ int virtio_read_many(ulong sector, void *load_addr, int sec_num)
out_hdr.ioprio = 99;
out_hdr.sector = virtio_sector_adjust(sector);
- vring_send_buf(&block, &out_hdr, sizeof(out_hdr), VRING_DESC_F_NEXT);
+ vring_send_buf(&block[0], &out_hdr, sizeof(out_hdr), VRING_DESC_F_NEXT);
/* This is where we want to receive data */
- vring_send_buf(&block, load_addr, virtio_get_block_size() * sec_num,
+ vring_send_buf(&block[0], load_addr, virtio_get_block_size() * sec_num,
VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN |
VRING_DESC_F_NEXT);
/* status field */
- vring_send_buf(&block, &status, sizeof(u8), VRING_DESC_F_WRITE |
+ vring_send_buf(&block[0], &status, sizeof(u8), VRING_DESC_F_WRITE |
VRING_HIDDEN_IS_CHAIN);
/* Now we can tell the host to read */
- vring_wait_reply(&block, 0);
+ vring_wait_reply(0);
- r = drain_irqs(block.schid);
+ r = drain_irqs(block[0].schid);
if (r) {
/* Well, whatever status is supposed to contain... */
status = 1;
@@ -363,15 +384,18 @@ uint64_t virtio_get_blocks(void)
(virtio_get_block_size() / VIRTIO_SECTOR_SIZE);
}
-void virtio_setup_block(SubChannelId schid)
+static void virtio_setup_ccw(SubChannelId schid,
+ int nvr, void *cfg, int cfg_size)
{
- VqInfo info;
- VqConfig config = {};
+ int i;
blk_cfg.blk_size = 0; /* mark "illegal" - setup started... */
+ nr_vqs = nvr;
guessed_disk_nature = false;
virtio_reset(schid);
+ IPL_assert(run_ccw(schid, CCW_CMD_READ_CONF, cfg, cfg_size) == 0,
+ "Could not get block device configuration");
/*
* Skipping CCW_CMD_READ_FEAT. We're not doing anything fancy, and
@@ -379,25 +403,33 @@ void virtio_setup_block(SubChannelId schid)
* expect it.
*/
- config.index = 0;
- if (run_ccw(schid, CCW_CMD_READ_VQ_CONF, &config, sizeof(config))) {
- panic("Could not get block device VQ configuration\n");
- }
- if (run_ccw(schid, CCW_CMD_READ_CONF, &blk_cfg, sizeof(blk_cfg))) {
- panic("Could not get block device configuration\n");
+ for (i = 0; i < nr_vqs; i++) {
+ VqInfo info = {
+ .queue = (unsigned long long) ring_area + (i * VIRTIO_RING_SIZE),
+ .align = KVM_S390_VIRTIO_RING_ALIGN,
+ .index = i,
+ .num = 0,
+ };
+ VqConfig config = {
+ .index = i,
+ .num = 0,
+ };
+
+ IPL_assert(
+ run_ccw(schid, CCW_CMD_READ_VQ_CONF, &config, sizeof(config)) == 0,
+ "Could not get block device VQ configuration");
+ info.num = config.num;
+ vring_init(&block[i], &info);
+ block[i].schid = schid;
+ IPL_assert(run_ccw(schid, CCW_CMD_SET_VQ, &info, sizeof(info)) == 0,
+ "Cannot set VQ info");
}
- vring_init(&block, config.num, ring_area,
- KVM_S390_VIRTIO_RING_ALIGN);
-
- info.queue = (unsigned long long) ring_area;
- info.align = KVM_S390_VIRTIO_RING_ALIGN;
- info.index = 0;
- info.num = config.num;
- block.schid = schid;
+ virtio_set_status(schid, VIRTIO_CONFIG_S_DRIVER_OK);
+}
- if (!run_ccw(schid, CCW_CMD_SET_VQ, &info, sizeof(info))) {
- virtio_set_status(schid, VIRTIO_CONFIG_S_DRIVER_OK);
- }
+void virtio_setup_block(SubChannelId schid)
+{
+ virtio_setup_ccw(schid, 1, &blk_cfg, sizeof(blk_cfg));
if (!virtio_ipl_disk_is_valid()) {
/* make sure all getters but blocksize return 0 for invalid IPL disk */
diff --git a/pc-bios/s390-ccw/virtio.h b/pc-bios/s390-ccw/virtio.h
index af6e142637..d17b1350d4 100644
--- a/pc-bios/s390-ccw/virtio.h
+++ b/pc-bios/s390-ccw/virtio.h
@@ -72,6 +72,8 @@ struct VirtioDev {
};
typedef struct VirtioDev VirtioDev;
+#define VIRTIO_RING_SIZE (PAGE_SIZE * 8)
+#define VIRTIO_MAX_VQS 3
#define KVM_S390_VIRTIO_RING_ALIGN 4096
#define VRING_USED_F_NO_NOTIFY 1
@@ -130,6 +132,8 @@ struct VRing {
VRingAvail *avail;
VRingUsed *used;
SubChannelId schid;
+ long cookie;
+ int id;
};
typedef struct VRing VRing;
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-02 07:11:24 +0000