diff mbox series

[v2,4/4] powerpc/pseries: minor enhancements in dlpar_memory_remove_by_ic()

Message ID 20210512202809.95363-5-danielhb413@gmail.com
State Accepted
Headers show
Series Unisolate LMBs DRC on removal error + cleanups | expand

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Context Check Description
snowpatch_ozlabs/apply_patch success Successfully applied on branch powerpc/merge (1fab3666d738e4af3a7450c44441310e4d7a7e53)
snowpatch_ozlabs/build-ppc64le success Build succeeded
snowpatch_ozlabs/build-ppc64be success Build succeeded
snowpatch_ozlabs/build-ppc64e success Build succeeded
snowpatch_ozlabs/build-pmac32 success Build succeeded
snowpatch_ozlabs/checkpatch warning total: 0 errors, 0 warnings, 1 checks, 44 lines checked
snowpatch_ozlabs/needsstable success Patch has no Fixes tags

Commit Message

Daniel Henrique Barboza May 12, 2021, 8:28 p.m. UTC
We don't need the 'lmbs_available' variable to count the valid LMBs and
to check if we have less than 'lmbs_to_remove'. We must ensure that the
entire LMB range must be removed, so we can error out immediately if any
LMB in the range is marked as reserved.

Add a couple of comments explaining the reasoning behind the differences
we have in this function in contrast to what it is done in its sister
function, dlpar_memory_remove_by_count().

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 .../platforms/pseries/hotplug-memory.c        | 28 +++++++++++++------
 1 file changed, 19 insertions(+), 9 deletions(-)

Comments

David Gibson May 13, 2021, 5:21 a.m. UTC | #1
On Wed, May 12, 2021 at 05:28:09PM -0300, Daniel Henrique Barboza wrote:
> We don't need the 'lmbs_available' variable to count the valid LMBs and
> to check if we have less than 'lmbs_to_remove'. We must ensure that the
> entire LMB range must be removed, so we can error out immediately if any
> LMB in the range is marked as reserved.
> 
> Add a couple of comments explaining the reasoning behind the differences
> we have in this function in contrast to what it is done in its sister
> function, dlpar_memory_remove_by_count().
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  .../platforms/pseries/hotplug-memory.c        | 28 +++++++++++++------
>  1 file changed, 19 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
> index 3c7ce5361ce3..ee88c1540fba 100644
> --- a/arch/powerpc/platforms/pseries/hotplug-memory.c
> +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
> @@ -517,7 +517,6 @@ static int dlpar_memory_remove_by_index(u32 drc_index)
>  static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
>  {
>  	struct drmem_lmb *lmb, *start_lmb, *end_lmb;
> -	int lmbs_available = 0;
>  	int rc;
>  
>  	pr_info("Attempting to hot-remove %u LMB(s) at %x\n",
> @@ -530,18 +529,29 @@ static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
>  	if (rc)
>  		return -EINVAL;
>  
> -	/* Validate that there are enough LMBs to satisfy the request */
> +	/*
> +	 * Validate that all LMBs in range are not reserved. Note that it
> +	 * is ok if they are !ASSIGNED since our goal here is to remove the
> +	 * LMB range, regardless of whether some LMBs were already removed
> +	 * by any other reason.
> +	 *
> +	 * This is a contrast to what is done in remove_by_count() where we
> +	 * check for both RESERVED and !ASSIGNED (via lmb_is_removable()),
> +	 * because we want to remove a fixed amount of LMBs in that function.
> +	 */
>  	for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
> -		if (lmb->flags & DRCONF_MEM_RESERVED)
> -			break;
> -
> -		lmbs_available++;
> +		if (lmb->flags & DRCONF_MEM_RESERVED) {
> +			pr_err("Memory at %llx (drc index %x) is reserved\n",
> +				lmb->base_addr, lmb->drc_index);
> +			return -EINVAL;
> +		}
>  	}
>  
> -	if (lmbs_available < lmbs_to_remove)
> -		return -EINVAL;
> -
>  	for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
> +		/*
> +		 * dlpar_remove_lmb() will error out if the LMB is already
> +		 * !ASSIGNED, but this case is a no-op for us.
> +		 */
>  		if (!(lmb->flags & DRCONF_MEM_ASSIGNED))
>  			continue;
>
diff mbox series

Patch

diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index 3c7ce5361ce3..ee88c1540fba 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -517,7 +517,6 @@  static int dlpar_memory_remove_by_index(u32 drc_index)
 static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
 {
 	struct drmem_lmb *lmb, *start_lmb, *end_lmb;
-	int lmbs_available = 0;
 	int rc;
 
 	pr_info("Attempting to hot-remove %u LMB(s) at %x\n",
@@ -530,18 +529,29 @@  static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
 	if (rc)
 		return -EINVAL;
 
-	/* Validate that there are enough LMBs to satisfy the request */
+	/*
+	 * Validate that all LMBs in range are not reserved. Note that it
+	 * is ok if they are !ASSIGNED since our goal here is to remove the
+	 * LMB range, regardless of whether some LMBs were already removed
+	 * by any other reason.
+	 *
+	 * This is a contrast to what is done in remove_by_count() where we
+	 * check for both RESERVED and !ASSIGNED (via lmb_is_removable()),
+	 * because we want to remove a fixed amount of LMBs in that function.
+	 */
 	for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
-		if (lmb->flags & DRCONF_MEM_RESERVED)
-			break;
-
-		lmbs_available++;
+		if (lmb->flags & DRCONF_MEM_RESERVED) {
+			pr_err("Memory at %llx (drc index %x) is reserved\n",
+				lmb->base_addr, lmb->drc_index);
+			return -EINVAL;
+		}
 	}
 
-	if (lmbs_available < lmbs_to_remove)
-		return -EINVAL;
-
 	for_each_drmem_lmb_in_range(lmb, start_lmb, end_lmb) {
+		/*
+		 * dlpar_remove_lmb() will error out if the LMB is already
+		 * !ASSIGNED, but this case is a no-op for us.
+		 */
 		if (!(lmb->flags & DRCONF_MEM_ASSIGNED))
 			continue;