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-rw-r--r--arch/powerpc/platforms/cell/spu_base.c50
-rw-r--r--arch/powerpc/platforms/cell/spufs/switch.c11
2 files changed, 50 insertions, 11 deletions
diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index 95001cdfaa26..ee37e0e39b6b 100644
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -275,19 +275,55 @@ static void __spu_kernel_slb(void *addr, struct spu_slb *slb)
}
/**
+ * Given an array of @nr_slbs SLB entries, @slbs, return non-zero if the
+ * address @new_addr is present.
+ */
+static inline int __slb_present(struct spu_slb *slbs, int nr_slbs,
+ void *new_addr)
+{
+ unsigned long ea = (unsigned long)new_addr;
+ int i;
+
+ for (i = 0; i < nr_slbs; i++)
+ if (!((slbs[i].esid ^ ea) & ESID_MASK))
+ return 1;
+
+ return 0;
+}
+
+/**
* Setup the SPU kernel SLBs, in preparation for a context save/restore. We
* need to map both the context save area, and the save/restore code.
+ *
+ * Because the lscsa and code may cross segment boundaires, we check to see
+ * if mappings are required for the start and end of each range. We currently
+ * assume that the mappings are smaller that one segment - if not, something
+ * is seriously wrong.
*/
-void spu_setup_kernel_slbs(struct spu *spu, struct spu_lscsa *lscsa, void *code)
+void spu_setup_kernel_slbs(struct spu *spu, struct spu_lscsa *lscsa,
+ void *code, int code_size)
{
- struct spu_slb code_slb, lscsa_slb;
+ struct spu_slb slbs[4];
+ int i, nr_slbs = 0;
+ /* start and end addresses of both mappings */
+ void *addrs[] = {
+ lscsa, (void *)lscsa + sizeof(*lscsa) - 1,
+ code, code + code_size - 1
+ };
+
+ /* check the set of addresses, and create a new entry in the slbs array
+ * if there isn't already a SLB for that address */
+ for (i = 0; i < ARRAY_SIZE(addrs); i++) {
+ if (__slb_present(slbs, nr_slbs, addrs[i]))
+ continue;
- __spu_kernel_slb(lscsa, &lscsa_slb);
- __spu_kernel_slb(code, &code_slb);
+ __spu_kernel_slb(addrs[i], &slbs[nr_slbs]);
+ nr_slbs++;
+ }
- spu_load_slb(spu, 0, &lscsa_slb);
- if (lscsa_slb.esid != code_slb.esid)
- spu_load_slb(spu, 1, &code_slb);
+ /* Add the set of SLBs */
+ for (i = 0; i < nr_slbs; i++)
+ spu_load_slb(spu, i, &slbs[i]);
}
EXPORT_SYMBOL_GPL(spu_setup_kernel_slbs);
diff --git a/arch/powerpc/platforms/cell/spufs/switch.c b/arch/powerpc/platforms/cell/spufs/switch.c
index 96f55148a408..8cbc6574820f 100644
--- a/arch/powerpc/platforms/cell/spufs/switch.c
+++ b/arch/powerpc/platforms/cell/spufs/switch.c
@@ -691,7 +691,8 @@ static inline void resume_mfc_queue(struct spu_state *csa, struct spu *spu)
out_be64(&priv2->mfc_control_RW, MFC_CNTL_RESUME_DMA_QUEUE);
}
-static inline void setup_mfc_slbs(struct spu_state *csa, struct spu *spu)
+static inline void setup_mfc_slbs(struct spu_state *csa, struct spu *spu,
+ unsigned int *code, int code_size)
{
/* Save, Step 47:
* Restore, Step 30.
@@ -708,7 +709,7 @@ static inline void setup_mfc_slbs(struct spu_state *csa, struct spu *spu)
* translation is desired by OS environment).
*/
spu_invalidate_slbs(spu);
- spu_setup_kernel_slbs(spu, csa->lscsa, &spu_save_code);
+ spu_setup_kernel_slbs(spu, csa->lscsa, code, code_size);
}
static inline void set_switch_active(struct spu_state *csa, struct spu *spu)
@@ -1835,7 +1836,8 @@ static void save_lscsa(struct spu_state *prev, struct spu *spu)
*/
resume_mfc_queue(prev, spu); /* Step 46. */
- setup_mfc_slbs(prev, spu); /* Step 47. */
+ /* Step 47. */
+ setup_mfc_slbs(prev, spu, spu_save_code, sizeof(spu_save_code));
set_switch_active(prev, spu); /* Step 48. */
enable_interrupts(prev, spu); /* Step 49. */
save_ls_16kb(prev, spu); /* Step 50. */
@@ -1940,7 +1942,8 @@ static void restore_lscsa(struct spu_state *next, struct spu *spu)
setup_spu_status_part1(next, spu); /* Step 27. */
setup_spu_status_part2(next, spu); /* Step 28. */
restore_mfc_rag(next, spu); /* Step 29. */
- setup_mfc_slbs(next, spu); /* Step 30. */
+ /* Step 30. */
+ setup_mfc_slbs(next, spu, spu_restore_code, sizeof(spu_restore_code));
set_spu_npc(next, spu); /* Step 31. */
set_signot1(next, spu); /* Step 32. */
set_signot2(next, spu); /* Step 33. */