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-rw-r--r--drivers/cxl/core/hdm.c145
-rw-r--r--drivers/cxl/cxl.h2
-rw-r--r--drivers/cxl/cxlmem.h13
3 files changed, 149 insertions, 11 deletions
diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 650363d5272f..47e3af440b3d 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -153,10 +153,107 @@ void cxl_dpa_debug(struct seq_file *file, struct cxl_dev_state *cxlds)
}
EXPORT_SYMBOL_NS_GPL(cxl_dpa_debug, CXL);
+/*
+ * Must be called in a context that synchronizes against this decoder's
+ * port ->remove() callback (like an endpoint decoder sysfs attribute)
+ */
+static void __cxl_dpa_release(struct cxl_endpoint_decoder *cxled)
+{
+ struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
+ struct cxl_dev_state *cxlds = cxlmd->cxlds;
+ struct resource *res = cxled->dpa_res;
+ resource_size_t skip_start;
+
+ lockdep_assert_held_write(&cxl_dpa_rwsem);
+
+ /* save @skip_start, before @res is released */
+ skip_start = res->start - cxled->skip;
+ __release_region(&cxlds->dpa_res, res->start, resource_size(res));
+ if (cxled->skip)
+ __release_region(&cxlds->dpa_res, skip_start, cxled->skip);
+ cxled->skip = 0;
+ cxled->dpa_res = NULL;
+}
+
+static void cxl_dpa_release(void *cxled)
+{
+ down_write(&cxl_dpa_rwsem);
+ __cxl_dpa_release(cxled);
+ up_write(&cxl_dpa_rwsem);
+}
+
+static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
+ resource_size_t base, resource_size_t len,
+ resource_size_t skipped)
+{
+ struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
+ struct cxl_port *port = cxled_to_port(cxled);
+ struct cxl_dev_state *cxlds = cxlmd->cxlds;
+ struct device *dev = &port->dev;
+ struct resource *res;
+
+ lockdep_assert_held_write(&cxl_dpa_rwsem);
+
+ if (!len)
+ return 0;
+
+ if (cxled->dpa_res) {
+ dev_dbg(dev, "decoder%d.%d: existing allocation %pr assigned\n",
+ port->id, cxled->cxld.id, cxled->dpa_res);
+ return -EBUSY;
+ }
+
+ if (skipped) {
+ res = __request_region(&cxlds->dpa_res, base - skipped, skipped,
+ dev_name(&cxled->cxld.dev), 0);
+ if (!res) {
+ dev_dbg(dev,
+ "decoder%d.%d: failed to reserve skipped space\n",
+ port->id, cxled->cxld.id);
+ return -EBUSY;
+ }
+ }
+ res = __request_region(&cxlds->dpa_res, base, len,
+ dev_name(&cxled->cxld.dev), 0);
+ if (!res) {
+ dev_dbg(dev, "decoder%d.%d: failed to reserve allocation\n",
+ port->id, cxled->cxld.id);
+ if (skipped)
+ __release_region(&cxlds->dpa_res, base - skipped,
+ skipped);
+ return -EBUSY;
+ }
+ cxled->dpa_res = res;
+ cxled->skip = skipped;
+
+ return 0;
+}
+
+static int devm_cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
+ resource_size_t base, resource_size_t len,
+ resource_size_t skipped)
+{
+ struct cxl_port *port = cxled_to_port(cxled);
+ int rc;
+
+ down_write(&cxl_dpa_rwsem);
+ rc = __cxl_dpa_reserve(cxled, base, len, skipped);
+ up_write(&cxl_dpa_rwsem);
+
+ if (rc)
+ return rc;
+
+ return devm_add_action_or_reset(&port->dev, cxl_dpa_release, cxled);
+}
+
static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
- int *target_map, void __iomem *hdm, int which)
+ int *target_map, void __iomem *hdm, int which,
+ u64 *dpa_base)
{
- u64 size, base;
+ struct cxl_endpoint_decoder *cxled = NULL;
+ u64 size, base, skip, dpa_size;
+ bool committed;
+ u32 remainder;
int i, rc;
u32 ctrl;
union {
@@ -164,11 +261,15 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
unsigned char target_id[8];
} target_list;
+ if (is_endpoint_decoder(&cxld->dev))
+ cxled = to_cxl_endpoint_decoder(&cxld->dev);
+
ctrl = readl(hdm + CXL_HDM_DECODER0_CTRL_OFFSET(which));
base = ioread64_hi_lo(hdm + CXL_HDM_DECODER0_BASE_LOW_OFFSET(which));
size = ioread64_hi_lo(hdm + CXL_HDM_DECODER0_SIZE_LOW_OFFSET(which));
+ committed = !!(ctrl & CXL_HDM_DECODER0_CTRL_COMMITTED);
- if (!(ctrl & CXL_HDM_DECODER0_CTRL_COMMITTED))
+ if (!committed)
size = 0;
if (base == U64_MAX || size == U64_MAX) {
dev_warn(&port->dev, "decoder%d.%d: Invalid resource range\n",
@@ -181,8 +282,8 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
.end = base + size - 1,
};
- /* switch decoders are always enabled if committed */
- if (ctrl & CXL_HDM_DECODER0_CTRL_COMMITTED) {
+ /* decoders are enabled if committed */
+ if (committed) {
cxld->flags |= CXL_DECODER_F_ENABLE;
if (ctrl & CXL_HDM_DECODER0_CTRL_LOCK)
cxld->flags |= CXL_DECODER_F_LOCK;
@@ -211,14 +312,35 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
if (rc)
return rc;
- if (is_endpoint_decoder(&cxld->dev))
+ if (!cxled) {
+ target_list.value =
+ ioread64_hi_lo(hdm + CXL_HDM_DECODER0_TL_LOW(which));
+ for (i = 0; i < cxld->interleave_ways; i++)
+ target_map[i] = target_list.target_id[i];
+
return 0;
+ }
- target_list.value =
- ioread64_hi_lo(hdm + CXL_HDM_DECODER0_TL_LOW(which));
- for (i = 0; i < cxld->interleave_ways; i++)
- target_map[i] = target_list.target_id[i];
+ if (!committed)
+ return 0;
+ dpa_size = div_u64_rem(size, cxld->interleave_ways, &remainder);
+ if (remainder) {
+ dev_err(&port->dev,
+ "decoder%d.%d: invalid committed configuration size: %#llx ways: %d\n",
+ port->id, cxld->id, size, cxld->interleave_ways);
+ return -ENXIO;
+ }
+ skip = ioread64_hi_lo(hdm + CXL_HDM_DECODER0_SKIP_LOW(which));
+ rc = devm_cxl_dpa_reserve(cxled, *dpa_base + skip, dpa_size, skip);
+ if (rc) {
+ dev_err(&port->dev,
+ "decoder%d.%d: Failed to reserve DPA range %#llx - %#llx\n (%d)",
+ port->id, cxld->id, *dpa_base,
+ *dpa_base + dpa_size + skip - 1, rc);
+ return rc;
+ }
+ *dpa_base += dpa_size + skip;
return 0;
}
@@ -231,6 +353,7 @@ int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm)
void __iomem *hdm = cxlhdm->regs.hdm_decoder;
struct cxl_port *port = cxlhdm->port;
int i, committed;
+ u64 dpa_base = 0;
u32 ctrl;
/*
@@ -277,7 +400,7 @@ int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm)
cxld = &cxlsd->cxld;
}
- rc = init_hdm_decoder(port, cxld, target_map, hdm, i);
+ rc = init_hdm_decoder(port, cxld, target_map, hdm, i, &dpa_base);
if (rc) {
put_device(&cxld->dev);
return rc;
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index e0b1e2e4dfee..5fe8b59a0b18 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -56,6 +56,8 @@
#define CXL_HDM_DECODER0_CTRL_TYPE BIT(12)
#define CXL_HDM_DECODER0_TL_LOW(i) (0x20 * (i) + 0x24)
#define CXL_HDM_DECODER0_TL_HIGH(i) (0x20 * (i) + 0x28)
+#define CXL_HDM_DECODER0_SKIP_LOW(i) CXL_HDM_DECODER0_TL_LOW(i)
+#define CXL_HDM_DECODER0_SKIP_HIGH(i) CXL_HDM_DECODER0_TL_HIGH(i)
static inline int cxl_hdm_decoder_count(u32 cap_hdr)
{
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index bfa2eaf649a9..ed731124fa10 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -50,6 +50,19 @@ static inline struct cxl_memdev *to_cxl_memdev(struct device *dev)
return container_of(dev, struct cxl_memdev, dev);
}
+static inline struct cxl_port *cxled_to_port(struct cxl_endpoint_decoder *cxled)
+{
+ return to_cxl_port(cxled->cxld.dev.parent);
+}
+
+static inline struct cxl_memdev *
+cxled_to_memdev(struct cxl_endpoint_decoder *cxled)
+{
+ struct cxl_port *port = to_cxl_port(cxled->cxld.dev.parent);
+
+ return to_cxl_memdev(port->uport);
+}
+
bool is_cxl_memdev(struct device *dev);
static inline bool is_cxl_endpoint(struct cxl_port *port)
{
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-06 22:18:06 +0300