On 4/19/2023 10:33, Ceraolo Spurio, Daniele wrote:
On 4/19/2023 10:12 AM, John Harrison wrote:
On 4/19/2023 10:02, John Harrison wrote:
On 4/18/2023 16:24, Ceraolo Spurio, Daniele wrote:
Typo doplicate in patch title
On 4/14/2023 5:57 PM, John.C.Harrison@xxxxxxxxx wrote:
From: John Harrison <John.C.Harrison@xxxxxxxxx>
It was noticed that duplicte entries in the firmware table could
cause
typo duplicte
an infinite loop in the firmware loading code if that entry failed to
load. Duplicate entries are a bug anyway and so should never happen.
Ensure they don't by tweaking the table validation code to reject
duplicates.
Here you're not really rejecting anything though, just printing an
error (and even that only if the SELFTEST kconfig is selected).
This would allow our CI to catch issues with patches sent to our
ML, but IIRC the reported bug was on a kernel fork. We could
disable the FW loading is the table for that particular blob type
is in an invalid state, as it wouldn't be safe to attempt a load in
that case anyway.
The validation code is rejecting duplicates. Whether the driver
loads or not after a failed validation is another matter.
I was basically assuming that CI will fail on the error message and
thus prevent such code ever being merged. But yeah, I guess we don't
run CI on backports to stable kernels and such. Although, I would
hope that anyone pushing patches to a stable kernel would run some
testing on it first!
Any thoughts on a good way to fail the load? We don't want to just
pretend that firmware is not wanted/required on the platform and
just load the i915 module without the firmware. Also, what about the
longer plan of moving the validation to a selftest. You can't fail
the load at all then.
Actually, forgot we already have a INTEL_UC_FIRMWARE_ERROR status.
That works fine for aborting the load. So just go with that and drop
the plan to move to a selftest?
John.
I do actually like the idea of moving this code to a mock selftest.
Maybe just add a comment above the tables making clear that duplicated
entries are not allowed and will break the loading flow?
The point is about accidental breakages. The 'issue' was not an actual
failure but that a failure could potentially occur if, for example, a
patch got applied twice due to some backport error/confusion. Adding a
comment doesn't help with that.
Given that it is trivial to return FIRMWARE_ERROR on a validation
failure, I'm inclined to go with that for now. The validation is still
only being done once (and moving it to _early time means we don't
actually need the static bool at all) and the driver is guaranteed to
not try to process a broken table and get confused. It is also instantly
evident if a backport is broken for any reason without worrying about
what kind of explicit testing may or may not be run.
John.
Daniele
John.
For full m/m/p files, that can be done by simply tweaking the patch
level check to reject matching values. For reduced version entries,
the filename itself must be compared.
Signed-off-by: John Harrison <John.C.Harrison@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c | 27
+++++++++++++++++++++---
1 file changed, 24 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
index c589782467265..44829247ef6bc 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -319,7 +319,7 @@ static void validate_fw_table_type(struct
drm_i915_private *i915, enum intel_uc_
{
const struct uc_fw_platform_requirement *fw_blobs;
u32 fw_count;
- int i;
+ int i, j;
if (type >= ARRAY_SIZE(blobs_all)) {
drm_err(&i915->drm, "No blob array for %s\n",
intel_uc_fw_type_repr(type));
@@ -334,6 +334,27 @@ static void validate_fw_table_type(struct
drm_i915_private *i915, enum intel_uc_
/* make sure the list is ordered as expected */
for (i = 1; i < fw_count; i++) {
+ /* Versionless file names must be unique per platform: */
+ for (j = i + 1; j < fw_count; j++) {
+ /* Same platform? */
+ if (fw_blobs[i].p != fw_blobs[j].p)
+ continue;
+
+ if (fw_blobs[i].blob.path != fw_blobs[j].blob.path)
+ continue;
+
+ drm_err(&i915->drm, "Diplicaate %s blobs: %s r%u
%s%d.%d.%d [%s] matches %s r%u %s%d.%d.%d [%s]\n",
Typo Diplicaate
Daniele
+ intel_uc_fw_type_repr(type),
+ intel_platform_name(fw_blobs[j].p), fw_blobs[j].rev,
+ fw_blobs[j].blob.legacy ? "L" : "v",
+ fw_blobs[j].blob.major, fw_blobs[j].blob.minor,
+ fw_blobs[j].blob.patch, fw_blobs[j].blob.path,
+ intel_platform_name(fw_blobs[i].p), fw_blobs[i].rev,
+ fw_blobs[i].blob.legacy ? "L" : "v",
+ fw_blobs[i].blob.major, fw_blobs[i].blob.minor,
+ fw_blobs[i].blob.patch, fw_blobs[i].blob.path);
+ }
+
/* Next platform is good: */
if (fw_blobs[i].p < fw_blobs[i - 1].p)
continue;
@@ -377,8 +398,8 @@ static void validate_fw_table_type(struct
drm_i915_private *i915, enum intel_uc_
if (fw_blobs[i].blob.minor != fw_blobs[i - 1].blob.minor)
goto bad;
- /* Patch versions must be in order: */
- if (fw_blobs[i].blob.patch <= fw_blobs[i - 1].blob.patch)
+ /* Patch versions must be in order and unique: */
+ if (fw_blobs[i].blob.patch < fw_blobs[i - 1].blob.patch)
continue;
bad:
