Add ioctl command ND_CMD_CALL_DSM to acpi_nfit_ctl and __nd_ioctl which
allow kernel to call a nvdimm's _DSM as a passthru without using the
marshaling code of the nd_cmd_desc.
Signed-off-by: Jerry Hoemann <jerry.hoemann@xxxxxxx>
---
drivers/acpi/nfit.c | 52 +++++++++++++++++++++++++++++++++++++++-------------
drivers/nvdimm/bus.c | 47 ++++++++++++++++++++++++++++++++++++++++++++---
2 files changed, 83 insertions(+), 16 deletions(-)
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index c1b8d03..8a8ec3f 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -76,6 +76,10 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
const u8 *uuid;
u32 offset;
int rc, i;
+ __u64 rev = 1, func = cmd;
+
+ struct nd_cmd_dsmcall_pkg *pkg = buf;
+ int dsm_call = (cmd == ND_CMD_CALL_DSM);
if (nvdimm) {
struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
@@ -99,6 +103,8 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
handle = adev->handle;
dimm_name = "bus";
}
+ if (dsm_call)
+ dsm_mask = ~0UL;
if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
return -ENOTTY;
@@ -118,15 +124,25 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc,
i, buf);
+ if (dsm_call) {
+ /* must skip over package wrapper */
+ in_buf.buffer.pointer = (void *) &pkg->dsm_buf;
+ in_buf.buffer.length = pkg->h.dsm_in;
+ /* for pass thru must use value sent in from user space. */
+ uuid = pkg->h.dsm_uuid;
+ rev = pkg->h.dsm_rev;
+ func = pkg->h.dsm_fun_idx;
+ }
+
if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
- dev_dbg(dev, "%s:%s cmd: %s input length: %d\n", __func__,
- dimm_name, cmd_name, in_buf.buffer.length);
- print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
- 4, in_buf.buffer.pointer, min_t(u32, 128,
- in_buf.buffer.length), true);
+ dev_dbg(dev, "%s:%s cmd: %d: %llu input length: %d\n", __func__,
+ dimm_name, cmd, func, in_buf.buffer.length);
+ print_hex_dump_debug("nvdimm in ", DUMP_PREFIX_OFFSET, 4, 4,
+ in_buf.buffer.pointer,
+ min_t(u32, 256, in_buf.buffer.length), true);
}
- out_obj = acpi_evaluate_dsm(handle, uuid, 1, cmd, &in_obj);
+ out_obj = acpi_evaluate_dsm(handle, uuid, rev, func, &in_obj);
if (!out_obj) {
dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name,
cmd_name);
@@ -134,18 +150,28 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
}
if (out_obj->package.type != ACPI_TYPE_BUFFER) {
- dev_dbg(dev, "%s:%s unexpected output object type cmd: %s type: %d\n",
- __func__, dimm_name, cmd_name, out_obj->type);
+ dev_dbg(dev, "%s:%s unexpected output object type cmd: %s %llu, type: %d\n",
+ __func__, dimm_name, cmd_name, func, out_obj->type);
rc = -EINVAL;
goto out;
}
if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
- dev_dbg(dev, "%s:%s cmd: %s output length: %d\n", __func__,
- dimm_name, cmd_name, out_obj->buffer.length);
- print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
- 4, out_obj->buffer.pointer, min_t(u32, 128,
- out_obj->buffer.length), true);
+ dev_dbg(dev, "%s:%s cmd %d: %llu output length %d\n", __func__,
+ dimm_name, cmd, func, out_obj->buffer.length);
+ print_hex_dump_debug("nvdimm out ", DUMP_PREFIX_OFFSET, 4, 4,
+ out_obj->buffer.pointer,
+ min_t(u32, 256, out_obj->buffer.length), true);
+ }
+
+ if (dsm_call) {
+ pkg->h.dsm_size = out_obj->buffer.length;
+ memcpy(pkg->dsm_buf + pkg->h.dsm_in,
+ out_obj->buffer.pointer,
+ min(pkg->h.dsm_size, pkg->h.dsm_out));
+
+ ACPI_FREE(out_obj);
+ return 0;
}
for (i = 0, offset = 0; i < desc->out_num; i++) {
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 87fe545..8d3a64b 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -367,6 +367,12 @@ static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
.out_num = 3,
.out_sizes = { 4, 4, UINT_MAX, },
},
+ [ND_CMD_CALL_DSM] = {
+ .in_num = 2,
+ .in_sizes = {sizeof(struct nd_cmd_dsmcall_pkg), UINT_MAX, },
+ .out_num = 1,
+ .out_sizes = { UINT_MAX, },
+ },
};
const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
@@ -395,6 +401,12 @@ static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
.out_num = 2,
.out_sizes = { 4, UINT_MAX, },
},
+ [ND_CMD_CALL_DSM] = {
+ .in_num = 2,
+ .in_sizes = {sizeof(struct nd_cmd_dsmcall_pkg), UINT_MAX, },
+ .out_num = 1,
+ .out_sizes = { UINT_MAX, },
+ },
};
const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
@@ -422,6 +434,10 @@ u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
struct nd_cmd_vendor_hdr *hdr = buf;
return hdr->in_length;
+ } else if (cmd == ND_CMD_CALL_DSM) {
+ struct nd_cmd_dsmcall_pkg *pkg = buf;
+
+ return pkg->h.dsm_in;
}
return UINT_MAX;
@@ -444,6 +460,12 @@ u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
return out_field[1];
else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 1)
return ND_CMD_ARS_STATUS_MAX;
+ else if (cmd == ND_CMD_CALL_DSM) {
+ struct nd_cmd_dsmcall_pkg *pkg =
+ (struct nd_cmd_dsmcall_pkg *) in_field;
+ return pkg->h.dsm_out;
+ }
+
return UINT_MAX;
}
@@ -491,19 +513,24 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
void __user *p = (void __user *) arg;
struct device *dev = &nvdimm_bus->dev;
const char *cmd_name, *dimm_name;
- unsigned long dsm_mask;
+ unsigned long dsm_mask = ~0UL;
void *buf;
int rc, i;
+ struct nd_cmd_dsmcall_pkg *pkg;
+ int dsm_call = (cmd == ND_CMD_CALL_DSM);
+
if (nvdimm) {
desc = nd_cmd_dimm_desc(cmd);
cmd_name = nvdimm_cmd_name(cmd);
- dsm_mask = nvdimm->dsm_mask ? *(nvdimm->dsm_mask) : 0;
+ if (!dsm_call)
+ dsm_mask = nvdimm->dsm_mask ? *(nvdimm->dsm_mask) : 0;
dimm_name = dev_name(&nvdimm->dev);
} else {
desc = nd_cmd_bus_desc(cmd);
cmd_name = nvdimm_bus_cmd_name(cmd);
- dsm_mask = nd_desc->dsm_mask;
+ if (!dsm_call)
+ dsm_mask = nd_desc->dsm_mask;
dimm_name = "bus";
}
@@ -517,6 +544,7 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
case ND_CMD_VENDOR:
case ND_CMD_SET_CONFIG_DATA:
case ND_CMD_ARS_START:
+ case ND_CMD_CALL_DSM:
dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n",
nvdimm ? nvdimm_cmd_name(cmd)
: nvdimm_bus_cmd_name(cmd));
@@ -544,6 +572,19 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
in_len += in_size;
}
+ if (dsm_call) {
+ pkg = (struct nd_cmd_dsmcall_pkg *) in_env;
+
+ dev_dbg(dev, "%s:%s rev: %llu, idx: %llu, in: %zu, out: %zu, len %zu\n",
+ __func__, dimm_name,
+ pkg->h.dsm_rev, pkg->h.dsm_fun_idx,
+ in_len, out_len, buf_len);
+
+ for (i = 0; i < ARRAY_SIZE(pkg->h.reserved2); i++)
+ if (pkg->h.reserved2[i])
+ return -EINVAL;
+ }
+
/* process an output envelope */
for (i = 0; i < desc->out_num; i++) {
u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
--
1.7.11.3
--
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