Le 01/01/2025 à 16:39, Alexander Usyskin a écrit :
Add auxiliary driver for intel discrete graphics
non-volatile memory device.
CC: Lucas De Marchi <lucas.demar...@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.v...@intel.com>
Acked-by: Miquel Raynal <miquel.ray...@bootlin.com>
Co-developed-by: Tomas Winkler <tom...@gmail.com>
Signed-off-by: Tomas Winkler <tom...@gmail.com>
Signed-off-by: Alexander Usyskin <alexander.usys...@intel.com>
...
+struct intel_dg_nvm {
+ struct kref refcnt;
+ void __iomem *base;
+ size_t size;
+ unsigned int nregions;
+ struct {
+ const char *name;
+ u8 id;
+ u64 offset;
+ u64 size;
+ } regions[];
__counted_by(nregions)?
+};
+
+static void intel_dg_nvm_release(struct kref *kref)
+{
+ struct intel_dg_nvm *nvm = container_of(kref, struct intel_dg_nvm,
refcnt);
+ int i;
+
+ pr_debug("freeing intel_dg nvm\n");
+ for (i = 0; i < nvm->nregions; i++)
+ kfree(nvm->regions[i].name);
+ kfree(nvm);
+}
+
+static int intel_dg_mtd_probe(struct auxiliary_device *aux_dev,
+ const struct auxiliary_device_id *aux_dev_id)
+{
+ struct intel_dg_nvm_dev *invm =
auxiliary_dev_to_intel_dg_nvm_dev(aux_dev);
+ struct device *device;
+ struct intel_dg_nvm *nvm;
+ unsigned int nregions;
+ unsigned int i, n;
+ size_t size;
+ char *name;
+ int ret;
+
+ device = &aux_dev->dev;
+
+ /* count available regions */
+ for (nregions = 0, i = 0; i < INTEL_DG_NVM_REGIONS; i++) {
+ if (invm->regions[i].name)
+ nregions++;
+ }
+
+ if (!nregions) {
+ dev_err(device, "no regions defined\n");
+ return -ENODEV;
+ }
+
+ size = sizeof(*nvm) + sizeof(nvm->regions[0]) * nregions;
struct_size()? (and maybe no need for size)
+ nvm = kzalloc(size, GFP_KERNEL);
+ if (!nvm)
+ return -ENOMEM;
+
+ kref_init(&nvm->refcnt);
+
+ nvm->nregions = nregions;
+ for (n = 0, i = 0; i < INTEL_DG_NVM_REGIONS; i++) {
+ if (!invm->regions[i].name)
+ continue;
+
+ name = kasprintf(GFP_KERNEL, "%s.%s",
+ dev_name(&aux_dev->dev),
invm->regions[i].name);
+ if (!name)
+ continue;
+ nvm->regions[n].name = name;
+ nvm->regions[n].id = i;
+ n++;
+ }
Should we set the exact number of regions, should a kasprintf() fail?
nvm->nregions = n;
This would make __counted_by be more accurate in its check.
+
+ nvm->base = devm_ioremap_resource(device, &invm->bar);
+ if (IS_ERR(nvm->base)) {
+ dev_err(device, "mmio not mapped\n");
+ ret = PTR_ERR(nvm->base);
+ goto err;
+ }
+
+ dev_set_drvdata(&aux_dev->dev, nvm);
+
+ return 0;
+
+err:
+ kref_put(&nvm->refcnt, intel_dg_nvm_release);
+ return ret;
+}
...
CJ
