diff mbox series

[2/6] EDAC/amd64: Gather hardware information early

Message ID 20191018153114.39378-3-Yazen.Ghannam@amd.com (mailing list archive)
State New, archived
Headers show
Series AMD64 EDAC: Check for nodes without memory, etc. | expand

Commit Message

Yazen Ghannam Oct. 18, 2019, 3:31 p.m. UTC 
From: Yazen Ghannam <yazen.ghannam@amd.com>

Split out gathering hardware information from init_one_instance() into a
separate function get_hardware_info().

This is necessary so that the information can be cached earlier and used
to check if memory is populated and if ECC is enabled on a node.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
Link:
https://lkml.kernel.org/r/20190821235938.118710-9-Yazen.Ghannam@amd.com

rfc -> v1:
* Fixup after making struct amd64_family_type fam_type global.

 drivers/edac/amd64_edac.c | 72 +++++++++++++++++++++++----------------
 1 file changed, 42 insertions(+), 30 deletions(-)

Comments

Borislav Petkov Oct. 21, 2019, 8:42 a.m. UTC | #1 
On Fri, Oct 18, 2019 at 03:31:26PM +0000, Ghannam, Yazen wrote:
> From: Yazen Ghannam <yazen.ghannam@amd.com>
> 
> Split out gathering hardware information from init_one_instance() into a
> separate function get_hardware_info().
> 
> This is necessary so that the information can be cached earlier and used
> to check if memory is populated and if ECC is enabled on a node.
> 
> Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
> ---
> Link:
> https://lkml.kernel.org/r/20190821235938.118710-9-Yazen.Ghannam@amd.com
> 
> rfc -> v1:
> * Fixup after making struct amd64_family_type fam_type global.
> 
>  drivers/edac/amd64_edac.c | 72 +++++++++++++++++++++++----------------
>  1 file changed, 42 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index b9a712819c68..4410da7c3a25 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -3416,33 +3416,16 @@ static void compute_num_umcs(void)
>  	edac_dbg(1, "Number of UMCs: %x", num_umcs);
>  }
>  
> -static int init_one_instance(unsigned int nid)
> +static int get_hardware_info(struct amd64_pvt *pvt)
>  {
> -	struct pci_dev *F3 = node_to_amd_nb(nid)->misc;
> -	struct mem_ctl_info *mci = NULL;
> -	struct edac_mc_layer layers[2];
> -	struct amd64_pvt *pvt = NULL;
>  	u16 pci_id1, pci_id2;
> -	int err = 0, ret;
> -
> -	ret = -ENOMEM;
> -	pvt = kzalloc(sizeof(struct amd64_pvt), GFP_KERNEL);
> -	if (!pvt)
> -		goto err_ret;
> -
> -	pvt->mc_node_id	= nid;
> -	pvt->F3 = F3;
> -
> -	ret = -EINVAL;
> -	fam_type = per_family_init(pvt);
> -	if (!fam_type)
> -		goto err_free;
> +	int ret = -EINVAL;
>  
>  	if (pvt->fam >= 0x17) {
>  		pvt->umc = kcalloc(num_umcs, sizeof(struct amd64_umc), GFP_KERNEL);
>  		if (!pvt->umc) {
>  			ret = -ENOMEM;
> -			goto err_free;
> +			goto err_ret;
>  		}
>  
>  		pci_id1 = fam_type->f0_id;
> @@ -3452,18 +3435,33 @@ static int init_one_instance(unsigned int nid)
>  		pci_id2 = fam_type->f2_id;
>  	}
>  
> -	err = reserve_mc_sibling_devs(pvt, pci_id1, pci_id2);
> -	if (err)
> +	ret = reserve_mc_sibling_devs(pvt, pci_id1, pci_id2);
> +	if (ret)
>  		goto err_post_init;
>  
>  	read_mc_regs(pvt);
>  
> +	return 0;
> +
> +err_post_init:
> +	if (pvt->fam >= 0x17)
> +		kfree(pvt->umc);

So you're freeing pvt->umc here but nothing in that function allocated
it. get_hardware_info() in probe_one_instance() did but if you do it
this way, it is kinda hard to follow and the layering is a bit iffy.

So what I'd suggest is:

* Rename get_hardware_info() to something like hw_info_get() so that
you can have a counterpart hw_info_put() which does any cleanup after
hw_info_get(), including the freeing of the ->umc.

* In probe_one_instance(), if init_one_instance() fails, call
hw_info_put() on the error path so that all your flow in the probe/init
functions is nicely ballanced and easily followed.

Makes sense?

Thx.
diff mbox series

Patch

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index b9a712819c68..4410da7c3a25 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -3416,33 +3416,16 @@  static void compute_num_umcs(void)
 	edac_dbg(1, "Number of UMCs: %x", num_umcs);
 }
 
-static int init_one_instance(unsigned int nid)
+static int get_hardware_info(struct amd64_pvt *pvt)
 {
-	struct pci_dev *F3 = node_to_amd_nb(nid)->misc;
-	struct mem_ctl_info *mci = NULL;
-	struct edac_mc_layer layers[2];
-	struct amd64_pvt *pvt = NULL;
 	u16 pci_id1, pci_id2;
-	int err = 0, ret;
-
-	ret = -ENOMEM;
-	pvt = kzalloc(sizeof(struct amd64_pvt), GFP_KERNEL);
-	if (!pvt)
-		goto err_ret;
-
-	pvt->mc_node_id	= nid;
-	pvt->F3 = F3;
-
-	ret = -EINVAL;
-	fam_type = per_family_init(pvt);
-	if (!fam_type)
-		goto err_free;
+	int ret = -EINVAL;
 
 	if (pvt->fam >= 0x17) {
 		pvt->umc = kcalloc(num_umcs, sizeof(struct amd64_umc), GFP_KERNEL);
 		if (!pvt->umc) {
 			ret = -ENOMEM;
-			goto err_free;
+			goto err_ret;
 		}
 
 		pci_id1 = fam_type->f0_id;
@@ -3452,18 +3435,33 @@  static int init_one_instance(unsigned int nid)
 		pci_id2 = fam_type->f2_id;
 	}
 
-	err = reserve_mc_sibling_devs(pvt, pci_id1, pci_id2);
-	if (err)
+	ret = reserve_mc_sibling_devs(pvt, pci_id1, pci_id2);
+	if (ret)
 		goto err_post_init;
 
 	read_mc_regs(pvt);
 
+	return 0;
+
+err_post_init:
+	if (pvt->fam >= 0x17)
+		kfree(pvt->umc);
+
+err_ret:
+	return ret;
+}
+
+static int init_one_instance(struct amd64_pvt *pvt)
+{
+	struct mem_ctl_info *mci = NULL;
+	struct edac_mc_layer layers[2];
+	int ret = -EINVAL;
+
 	/*
 	 * We need to determine how many memory channels there are. Then use
 	 * that information for calculating the size of the dynamic instance
 	 * tables in the 'mci' structure.
 	 */
-	ret = -EINVAL;
 	pvt->channel_count = pvt->ops->early_channel_count(pvt);
 	if (pvt->channel_count < 0)
 		goto err_siblings;
@@ -3488,7 +3486,7 @@  static int init_one_instance(unsigned int nid)
 		layers[1].size = 2;
 	layers[1].is_virt_csrow = false;
 
-	mci = edac_mc_alloc(nid, ARRAY_SIZE(layers), layers, 0);
+	mci = edac_mc_alloc(pvt->mc_node_id, ARRAY_SIZE(layers), layers, 0);
 	if (!mci)
 		goto err_siblings;
 
@@ -3514,20 +3512,16 @@  static int init_one_instance(unsigned int nid)
 err_siblings:
 	free_mc_sibling_devs(pvt);
 
-err_post_init:
 	if (pvt->fam >= 0x17)
 		kfree(pvt->umc);
 
-err_free:
-	kfree(pvt);
-
-err_ret:
 	return ret;
 }
 
 static int probe_one_instance(unsigned int nid)
 {
 	struct pci_dev *F3 = node_to_amd_nb(nid)->misc;
+	struct amd64_pvt *pvt = NULL;
 	struct ecc_settings *s;
 	int ret;
 
@@ -3538,6 +3532,21 @@  static int probe_one_instance(unsigned int nid)
 
 	ecc_stngs[nid] = s;
 
+	pvt = kzalloc(sizeof(struct amd64_pvt), GFP_KERNEL);
+	if (!pvt)
+		goto err_settings;
+
+	pvt->mc_node_id	= nid;
+	pvt->F3 = F3;
+
+	fam_type = per_family_init(pvt);
+	if (!fam_type)
+		goto err_enable;
+
+	ret = get_hardware_info(pvt);
+	if (ret < 0)
+		goto err_enable;
+
 	if (!ecc_enabled(F3, nid)) {
 		ret = 0;
 
@@ -3554,7 +3563,7 @@  static int probe_one_instance(unsigned int nid)
 			goto err_enable;
 	}
 
-	ret = init_one_instance(nid);
+	ret = init_one_instance(pvt);
 	if (ret < 0) {
 		amd64_err("Error probing instance: %d\n", nid);
 
@@ -3567,6 +3576,9 @@  static int probe_one_instance(unsigned int nid)
 	return ret;
 
 err_enable:
+	kfree(pvt);
+
+err_settings:
 	kfree(s);
 	ecc_stngs[nid] = NULL;