summaryrefslogtreecommitdiff
path: root/drivers/misc
diff options
context:
space:
mode:
authorIan Munsie <imunsie@au1.ibm.com>2016-05-04 14:52:58 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2016-05-11 21:54:10 +1000
commit3c206fa77aaaac8cd7d4cfcd840c82495b01b288 (patch)
tree359020d4afbb21676e01d3df6dbf903ccdd558a2 /drivers/misc
parent0e5b5ba17ac33a05d9f4a48b5eb8b5e30f2274d7 (diff)
cxl: Ensure PSL interrupt is configured for contexts with no AFU IRQs
In the cxl kernel API, it is possible to create a context and start it without allocating any interrupts. Since we assign or allocate the PSL interrupt when allocating AFU interrupts this will lead to a situation where we start the context with no means to take any faults. The user API is not affected as it always goes through the cxl interrupt allocation code paths and will have the PSL interrupt allocated or assigned, even if no AFU interrupts were requested. This checks that at least one interrupt is configured at the time of attach, and if not it will assign the multiplexed PSL interrupt for powernv, or allocate a single interrupt for PowerVM. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/cxl/guest.c12
-rw-r--r--drivers/misc/cxl/native.c9
2 files changed, 21 insertions, 0 deletions
diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
index a83acf9f8cd9..769971c065b4 100644
--- a/drivers/misc/cxl/guest.c
+++ b/drivers/misc/cxl/guest.c
@@ -552,6 +552,17 @@ static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
elem->common.sstp0 = cpu_to_be64(ctx->sstp0);
elem->common.sstp1 = cpu_to_be64(ctx->sstp1);
+
+ /*
+ * Ensure we have at least one interrupt allocated to take faults for
+ * kernel contexts that may not have allocated any AFU IRQs at all:
+ */
+ if (ctx->irqs.range[0] == 0) {
+ rc = afu_register_irqs(ctx, 0);
+ if (rc)
+ goto out_free;
+ }
+
for (r = 0; r < CXL_IRQ_RANGES; r++) {
for (i = 0; i < ctx->irqs.range[r]; i++) {
if (r == 0 && i == 0) {
@@ -597,6 +608,7 @@ static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
enable_afu_irqs(ctx);
}
+out_free:
free_page((u64)elem);
return rc;
}
diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
index b8b547a162eb..5d4fb9fd84bc 100644
--- a/drivers/misc/cxl/native.c
+++ b/drivers/misc/cxl/native.c
@@ -534,6 +534,15 @@ static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
ctx->elem->common.sstp0 = cpu_to_be64(ctx->sstp0);
ctx->elem->common.sstp1 = cpu_to_be64(ctx->sstp1);
+ /*
+ * Ensure we have the multiplexed PSL interrupt set up to take faults
+ * for kernel contexts that may not have allocated any AFU IRQs at all:
+ */
+ if (ctx->irqs.range[0] == 0) {
+ ctx->irqs.offset[0] = ctx->afu->native->psl_hwirq;
+ ctx->irqs.range[0] = 1;
+ }
+
for (r = 0; r < CXL_IRQ_RANGES; r++) {
ctx->elem->ivte_offsets[r] = cpu_to_be16(ctx->irqs.offset[r]);
ctx->elem->ivte_ranges[r] = cpu_to_be16(ctx->irqs.range[r]);