Re: [PATCH 03/19] EDAC: Introduce mci_for_each_dimm() iterator

Mauro Carvalho Chehab
2019-10-11T10:14:46Z

Em Thu, 10 Oct 2019 20:25:10 +0000
Robert Richter <rrichter@marvell.com> escreveu:

> Introduce the mci_for_each_dimm() iterator. It returns a pointer to a
> struct dimm_info. This makes the declaration and use of an index
> obsolete and avoids access to internal data of struct mci (direct
> array access etc).
>
> Signed-off-by: Robert Richter <rrichter@marvell.com>

Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

> ---
> drivers/edac/edac_mc.c | 19 +++++++++++--------
> drivers/edac/edac_mc_sysfs.c | 29 ++++++++++++-----------------
> drivers/edac/ghes_edac.c | 8 ++++----
> drivers/edac/i5100_edac.c | 13 +++++--------
> include/linux/edac.h | 7 +++++++
> 5 files changed, 39 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
> index 72088d49b03b..c5240bb4c6c0 100644
> --- a/drivers/edac/edac_mc.c
> +++ b/drivers/edac/edac_mc.c
> @@ -145,15 +145,18 @@ static void edac_mc_dump_channel(struct rank_info *chan)
> edac_dbg(4, " channel->dimm = %p\n", chan->dimm);
> }
>
> -static void edac_mc_dump_dimm(struct dimm_info *dimm, int number)
> +static void edac_mc_dump_dimm(struct dimm_info *dimm)
> {
> char location[80];
>
> + if (!dimm->nr_pages)
> + return;
> +
> edac_dimm_info_location(dimm, location, sizeof(location));
>
> edac_dbg(4, "%s%i: %smapped as virtual row %d, chan %d\n",
> dimm->mci->csbased ? "rank" : "dimm",
> - number, location, dimm->csrow, dimm->cschannel);
> + dimm->idx, location, dimm->csrow, dimm->cschannel);
> edac_dbg(4, " dimm = %p\n", dimm);
> edac_dbg(4, " dimm->label = '%s'\n", dimm->label);
> edac_dbg(4, " dimm->nr_pages = 0x%x\n", dimm->nr_pages);
> @@ -702,6 +705,7 @@ EXPORT_SYMBOL_GPL(edac_get_owner);
> int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
> const struct attribute_group **groups)
> {
> + struct dimm_info *dimm;
> int ret = -EINVAL;
> edac_dbg(0, "\n");
>
> @@ -726,9 +730,9 @@ int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
> if (csrow->channels[j]->dimm->nr_pages)
> edac_mc_dump_channel(csrow->channels[j]);
> }
> - for (i = 0; i < mci->tot_dimms; i++)
> - if (mci->dimms[i]->nr_pages)
> - edac_mc_dump_dimm(mci->dimms[i], i);
> +
> + mci_for_each_dimm(mci, dimm)
> + edac_mc_dump_dimm(dimm);
> }
> #endif
> mutex_lock(&mem_ctls_mutex);
> @@ -1086,6 +1090,7 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
> const char *msg,
> const char *other_detail)
> {
> + struct dimm_info *dimm;
> char *p;
> int row = -1, chan = -1;
> int pos[EDAC_MAX_LAYERS] = { top_layer, mid_layer, low_layer };
> @@ -1146,9 +1151,7 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
> p = e->label;
> *p = '\0';
>
> - for (i = 0; i < mci->tot_dimms; i++) {
> - struct dimm_info *dimm = mci->dimms[i];
> -
> + mci_for_each_dimm(mci, dimm) {
> if (top_layer >= 0 && top_layer != dimm->location[0])
> continue;
> if (mid_layer >= 0 && mid_layer != dimm->location[1])
> diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
> index 91e4c8f155af..0367554e7437 100644
> --- a/drivers/edac/edac_mc_sysfs.c
> +++ b/drivers/edac/edac_mc_sysfs.c
> @@ -621,8 +621,7 @@ static const struct device_type dimm_attr_type = {
>
> /* Create a DIMM object under specifed memory controller device */
> static int edac_create_dimm_object(struct mem_ctl_info *mci,
> - struct dimm_info *dimm,
> - int index)
> + struct dimm_info *dimm)
> {
> int err;
> dimm->mci = mci;
> @@ -632,9 +631,9 @@ static int edac_create_dimm_object(struct mem_ctl_info *mci,
>
> dimm->dev.parent = &mci->dev;
> if (mci->csbased)
> - dev_set_name(&dimm->dev, "rank%d", index);
> + dev_set_name(&dimm->dev, "rank%d", dimm->idx);
> else
> - dev_set_name(&dimm->dev, "dimm%d", index);
> + dev_set_name(&dimm->dev, "dimm%d", dimm->idx);
> dev_set_drvdata(&dimm->dev, dimm);
> pm_runtime_forbid(&mci->dev);
>
> @@ -916,7 +915,8 @@ static const struct device_type mci_attr_type = {
> int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
> const struct attribute_group **groups)
> {
> - int i, err;
> + struct dimm_info *dimm;
> + int err;
>
> /* get the /sys/devices/system/edac subsys reference */
> mci->dev.type = &mci_attr_type;
> @@ -940,13 +940,12 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
> /*
> * Create the dimm/rank devices
> */
> - for (i = 0; i < mci->tot_dimms; i++) {
> - struct dimm_info *dimm = mci->dimms[i];
> + mci_for_each_dimm(mci, dimm) {
> /* Only expose populated DIMMs */
> if (!dimm->nr_pages)
> continue;
>
> - err = edac_create_dimm_object(mci, dimm, i);
> + err = edac_create_dimm_object(mci, dimm);
> if (err)
> goto fail_unregister_dimm;
> }
> @@ -961,12 +960,9 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
> return 0;
>
> fail_unregister_dimm:
> - for (i--; i >= 0; i--) {
> - struct dimm_info *dimm = mci->dimms[i];
> - if (!dimm->nr_pages)
> - continue;
> -
> - device_unregister(&dimm->dev);
> + mci_for_each_dimm(mci, dimm) {
> + if (device_is_registered(&dimm->dev))
> + device_unregister(&dimm->dev);
> }
> device_unregister(&mci->dev);
>
> @@ -978,7 +974,7 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
> */
> void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
> {
> - int i;
> + struct dimm_info *dimm;
>
> edac_dbg(0, "\n");
>
> @@ -989,8 +985,7 @@ void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
> edac_delete_csrow_objects(mci);
> #endif
>
> - for (i = 0; i < mci->tot_dimms; i++) {
> - struct dimm_info *dimm = mci->dimms[i];
> + mci_for_each_dimm(mci, dimm) {
> if (dimm->nr_pages == 0)
> continue;
> edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev));
> diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
> index fb31e80dfe94..842080d7b33a 100644
> --- a/drivers/edac/ghes_edac.c
> +++ b/drivers/edac/ghes_edac.c
> @@ -82,11 +82,11 @@ static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg)
> static int get_dimm_smbios_index(u16 handle)
> {
> struct mem_ctl_info *mci = ghes_pvt->mci;
> - int i;
> + struct dimm_info *dimm;
>
> - for (i = 0; i < mci->tot_dimms; i++) {
> - if (mci->dimms[i]->smbios_handle == handle)
> - return i;
> + mci_for_each_dimm(mci, dimm) {
> + if (dimm->smbios_handle == handle)
> + return dimm->idx;
> }
> return -1;
> }
> diff --git a/drivers/edac/i5100_edac.c b/drivers/edac/i5100_edac.c
> index 134586753311..0ddc41e47a96 100644
> --- a/drivers/edac/i5100_edac.c
> +++ b/drivers/edac/i5100_edac.c
> @@ -846,20 +846,17 @@ static void i5100_init_interleaving(struct pci_dev *pdev,
>
> static void i5100_init_csrows(struct mem_ctl_info *mci)
> {
> - int i;
> struct i5100_priv *priv = mci->pvt_info;
> + struct dimm_info *dimm;
>
> - for (i = 0; i < mci->tot_dimms; i++) {
> - struct dimm_info *dimm;
> - const unsigned long npages = i5100_npages(mci, i);
> - const unsigned int chan = i5100_csrow_to_chan(mci, i);
> - const unsigned int rank = i5100_csrow_to_rank(mci, i);
> + mci_for_each_dimm(mci, dimm) {
> + const unsigned long npages = i5100_npages(mci, dimm->idx);
> + const unsigned int chan = i5100_csrow_to_chan(mci, dimm->idx);
> + const unsigned int rank = i5100_csrow_to_rank(mci, dimm->idx);
>
> if (!npages)
> continue;
>
> - dimm = edac_get_dimm(mci, chan, rank, 0);
> -
> dimm->nr_pages = npages;
> dimm->grain = 32;
> dimm->dtype = (priv->mtr[chan][rank].width == 4) ?
> diff --git a/include/linux/edac.h b/include/linux/edac.h
> index 79c5564ee314..8beb6e834be9 100644
> --- a/include/linux/edac.h
> +++ b/include/linux/edac.h
> @@ -599,6 +599,13 @@ struct mem_ctl_info {
> u16 fake_inject_count;
> };
>
> +#define mci_for_each_dimm(mci, dimm) \
> + for ((dimm) = (mci)->dimms[0]; \
> + (dimm); \
> + (dimm) = (dimm)->idx + 1 < (mci)->tot_dimms \
> + ? (mci)->dimms[(dimm)->idx + 1] \
> + : NULL)
> +
> /**
> * edac_get_dimm_by_index - Get DIMM info from a memory controller
> * given by an index

Thanks,
Mauro