[POWERPC] spufs: Add /lslr, /dma_info and /proxydma files

The /lslr file gives read access to the SPU_LSLR register in hex; 0x3fff
for example The /dma_info file provides read access to the SPU Command
Queue in a binary format. The /proxydma_info files provides read access
access to the Proxy Command Queue in a binary format. The spu_info.h
file provides data structures for interpreting the binary format of
/dma_info and /proxydma_info.

Signed-off-by: Dwayne Grant McConnell <decimal@us.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 137 insertions, 6 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/backing_ops.c b/arch/powerpc/platforms/cell/spufs/backing_ops.c
index 2d22cd59d6fc..21b28f61b00f 100644
--- a/arch/powerpc/platforms/cell/spufs/backing_ops.c
+++ b/arch/powerpc/platforms/cell/spufs/backing_ops.c
@@ -36,6 +36,7 @@
 #include <asm/io.h>
 #include <asm/spu.h>
 #include <asm/spu_csa.h>
+#include <asm/spu_info.h>
 #include <asm/mmu_context.h>
 #include "spufs.h"
 
diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index 7f1262706671..5bfabffd117e 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -32,6 +32,7 @@
 #include <asm/io.h>
 #include <asm/semaphore.h>
 #include <asm/spu.h>
+#include <asm/spu_info.h>
 #include <asm/uaccess.h>
 
 #include "spufs.h"
@@ -1482,6 +1483,23 @@ static u64 spufs_event_mask_get(void *data)
 DEFINE_SIMPLE_ATTRIBUTE(spufs_event_mask_ops, spufs_event_mask_get,
                         spufs_event_mask_set, "0x%llx\n")
 
+static u64 spufs_event_status_get(void *data)
+{
+        struct spu_context *ctx = data;
+        struct spu_state *state = &ctx->csa;
+        u64 ret = 0;
+        u64 stat;
+
+        spu_acquire_saved(ctx);
+        stat = state->spu_chnlcnt_RW[0];
+        if (stat)
+                ret = state->spu_chnldata_RW[0];
+        spu_release(ctx);
+        return ret;
+}
+DEFINE_SIMPLE_ATTRIBUTE(spufs_event_status_ops, spufs_event_status_get,
+                        NULL, "0x%llx\n")
+
 static void spufs_srr0_set(void *data, u64 val)
 {
         struct spu_context *ctx = data;
@@ -1535,6 +1553,109 @@ static void spufs_object_id_set(void *data, u64 id)
 DEFINE_SIMPLE_ATTRIBUTE(spufs_object_id_ops, spufs_object_id_get,
                 spufs_object_id_set, "0x%llx\n");
 
+static u64 spufs_lslr_get(void *data)
+{
+        struct spu_context *ctx = data;
+        u64 ret;
+
+        spu_acquire_saved(ctx);
+        ret = ctx->csa.priv2.spu_lslr_RW;
+        spu_release(ctx);
+
+        return ret;
+}
+DEFINE_SIMPLE_ATTRIBUTE(spufs_lslr_ops, spufs_lslr_get, NULL, "0x%llx\n")
+
+static int spufs_info_open(struct inode *inode, struct file *file)
+{
+        struct spufs_inode_info *i = SPUFS_I(inode);
+        struct spu_context *ctx = i->i_ctx;
+        file->private_data = ctx;
+        return 0;
+}
+
+static ssize_t spufs_dma_info_read(struct file *file, char __user *buf,
+                              size_t len, loff_t *pos)
+{
+        struct spu_context *ctx = file->private_data;
+        struct spu_dma_info info;
+        struct mfc_cq_sr *qp, *spuqp;
+        int i;
+
+        if (!access_ok(VERIFY_WRITE, buf, len))
+                return -EFAULT;
+
+        spu_acquire_saved(ctx);
+        spin_lock(&ctx->csa.register_lock);
+        info.dma_info_type = ctx->csa.priv2.spu_tag_status_query_RW;
+        info.dma_info_mask = ctx->csa.lscsa->tag_mask.slot[0];
+        info.dma_info_status = ctx->csa.spu_chnldata_RW[24];
+        info.dma_info_stall_and_notify = ctx->csa.spu_chnldata_RW[25];
+        info.dma_info_atomic_command_status = ctx->csa.spu_chnldata_RW[27];
+        for (i = 0; i < 16; i++) {
+                qp = &info.dma_info_command_data[i];
+                spuqp = &ctx->csa.priv2.spuq[i];
+
+                qp->mfc_cq_data0_RW = spuqp->mfc_cq_data0_RW;
+                qp->mfc_cq_data1_RW = spuqp->mfc_cq_data1_RW;
+                qp->mfc_cq_data2_RW = spuqp->mfc_cq_data2_RW;
+                qp->mfc_cq_data3_RW = spuqp->mfc_cq_data3_RW;
+        }
+        spin_unlock(&ctx->csa.register_lock);
+        spu_release(ctx);
+
+        return simple_read_from_buffer(buf, len, pos, &info,
+                                sizeof info);
+}
+
+static struct file_operations spufs_dma_info_fops = {
+        .open = spufs_info_open,
+        .read = spufs_dma_info_read,
+};
+
+static ssize_t spufs_proxydma_info_read(struct file *file, char __user *buf,
+                                   size_t len, loff_t *pos)
+{
+        struct spu_context *ctx = file->private_data;
+        struct spu_proxydma_info info;
+        int ret = sizeof info;
+        struct mfc_cq_sr *qp, *puqp;
+        int i;
+
+        if (len < ret)
+                return -EINVAL;
+
+        if (!access_ok(VERIFY_WRITE, buf, len))
+                return -EFAULT;
+
+        spu_acquire_saved(ctx);
+        spin_lock(&ctx->csa.register_lock);
+        info.proxydma_info_type = ctx->csa.prob.dma_querytype_RW;
+        info.proxydma_info_mask = ctx->csa.prob.dma_querymask_RW;
+        info.proxydma_info_status = ctx->csa.prob.dma_tagstatus_R;
+        for (i = 0; i < 8; i++) {
+                qp = &info.proxydma_info_command_data[i];
+                puqp = &ctx->csa.priv2.puq[i];
+
+                qp->mfc_cq_data0_RW = puqp->mfc_cq_data0_RW;
+                qp->mfc_cq_data1_RW = puqp->mfc_cq_data1_RW;
+                qp->mfc_cq_data2_RW = puqp->mfc_cq_data2_RW;
+                qp->mfc_cq_data3_RW = puqp->mfc_cq_data3_RW;
+        }
+        spin_unlock(&ctx->csa.register_lock);
+        spu_release(ctx);
+
+        if (copy_to_user(buf, &info, sizeof info))
+                ret = -EFAULT;
+
+        return ret;
+}
+
+static struct file_operations spufs_proxydma_info_fops = {
+        .open = spufs_info_open,
+        .read = spufs_proxydma_info_read,
+};
+
 struct tree_descr spufs_dir_contents[] = {
         { "mem",  &spufs_mem_fops,  0666, },
         { "regs", &spufs_regs_fops,  0666, },
@@ -1548,19 +1669,23 @@ struct tree_descr spufs_dir_contents[] = {
         { "signal2", &spufs_signal2_fops, 0666, },
         { "signal1_type", &spufs_signal1_type, 0666, },
         { "signal2_type", &spufs_signal2_type, 0666, },
-        { "mss", &spufs_mss_fops, 0666, },
-        { "mfc", &spufs_mfc_fops, 0666, },
         { "cntl", &spufs_cntl_fops,  0666, },
-        { "npc", &spufs_npc_ops, 0666, },
         { "fpcr", &spufs_fpcr_fops, 0666, },
+        { "lslr", &spufs_lslr_ops, 0444, },
+        { "mfc", &spufs_mfc_fops, 0666, },
+        { "mss", &spufs_mss_fops, 0666, },
+        { "npc", &spufs_npc_ops, 0666, },
+        { "srr0", &spufs_srr0_ops, 0666, },
         { "decr", &spufs_decr_ops, 0666, },
         { "decr_status", &spufs_decr_status_ops, 0666, },
         { "spu_tag_mask", &spufs_spu_tag_mask_ops, 0666, },
         { "event_mask", &spufs_event_mask_ops, 0666, },
-        { "srr0", &spufs_srr0_ops, 0666, },
+        { "event_status", &spufs_event_status_ops, 0444, },
         { "psmap", &spufs_psmap_fops, 0666, },
         { "phys-id", &spufs_id_ops, 0666, },
         { "object-id", &spufs_object_id_ops, 0666, },
+        { "dma_info", &spufs_dma_info_fops, 0444, },
+        { "proxydma_info", &spufs_proxydma_info_fops, 0444, },
         {},
 };
 
diff --git a/arch/powerpc/platforms/cell/spufs/spufs.h b/arch/powerpc/platforms/cell/spufs/spufs.h
index f438f0b8525d..3e7cfc246147 100644
--- a/arch/powerpc/platforms/cell/spufs/spufs.h
+++ b/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -29,6 +29,7 @@
 
 #include <asm/spu.h>
 #include <asm/spu_csa.h>
+#include <asm/spu_info.h>
 
 /* The magic number for our file system */
 enum {
@@ -119,8 +120,12 @@ struct spu_context_ops {
         int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
         u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
         u32 (*get_mfc_free_elements)(struct spu_context *ctx);
-        int (*send_mfc_command)(struct spu_context *ctx,
-                                        struct mfc_dma_command *cmd);
+        int (*send_mfc_command)(struct spu_context * ctx,
+                                struct mfc_dma_command * cmd);
+        void (*dma_info_read) (struct spu_context * ctx,
+                               struct spu_dma_info * info);
+        void (*proxydma_info_read) (struct spu_context * ctx,
+                                    struct spu_proxydma_info * info);
 };
 
 extern struct spu_context_ops spu_hw_ops;