| Message ID | 20220413183720.2444089-4-ben.widawsky@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Region driver | expand |
On Wed, Apr 13, 2022 at 11:38 AM Ben Widawsky <ben.widawsky@intel.com> wrote: > > This reverts commit 608135db1b790170d22848815c4671407af74e37. All Did checkpatch not complain about this being in "commit <12-character-commit-id> <commit summary format>"? However, I'd rather just drop the revert language and say: Change root decoders to reuse the existing ->range field to track the decoder's programmed HPA range. The infrastructure to track the allocations out of the root decoder range is still a work-in-progress, but in the meantime it simplifies the code to always represent the current decoder range setting in the ->range field regardless of decoder type. > decoders do have a host physical address space and the revert allows us > to keep that uniformity. Decoder disambiguation will allow for decoder > type-specific members which is needed, but will be handled separately. > > Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> > > --- > The explanation for why it is impossible to make CFMWS ranges be > iomem_resources is explain in a later patch. This change stands alone / is independent of any iomem_resource concerns, right? > --- > drivers/cxl/acpi.c | 17 ++++++++++------- > drivers/cxl/core/hdm.c | 2 +- > drivers/cxl/core/port.c | 28 ++++++---------------------- > drivers/cxl/cxl.h | 8 ++------ > 4 files changed, 19 insertions(+), 36 deletions(-) > > diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c > index d15a6aec0331..9b69955b90cb 100644 > --- a/drivers/cxl/acpi.c > +++ b/drivers/cxl/acpi.c > @@ -108,8 +108,10 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, > > cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); > cxld->target_type = CXL_DECODER_EXPANDER; > - cxld->platform_res = (struct resource)DEFINE_RES_MEM(cfmws->base_hpa, > - cfmws->window_size); > + cxld->range = (struct range){ > + .start = cfmws->base_hpa, > + .end = cfmws->base_hpa + cfmws->window_size - 1, > + }; > cxld->interleave_ways = CFMWS_INTERLEAVE_WAYS(cfmws); > cxld->interleave_granularity = CFMWS_INTERLEAVE_GRANULARITY(cfmws); > > @@ -119,13 +121,14 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, > else > rc = cxl_decoder_autoremove(dev, cxld); > if (rc) { > - dev_err(dev, "Failed to add decoder for %pr\n", > - &cxld->platform_res); > + dev_err(dev, "Failed to add decoder for %#llx-%#llx\n", > + cfmws->base_hpa, > + cfmws->base_hpa + cfmws->window_size - 1); > return 0; > } > - dev_dbg(dev, "add: %s node: %d range %pr\n", dev_name(&cxld->dev), > - phys_to_target_node(cxld->platform_res.start), > - &cxld->platform_res); > + dev_dbg(dev, "add: %s node: %d range %#llx-%#llx\n", > + dev_name(&cxld->dev), phys_to_target_node(cxld->range.start), > + cfmws->base_hpa, cfmws->base_hpa + cfmws->window_size - 1); > > return 0; > } > diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c > index c3c021b54079..3055e246aab9 100644 > --- a/drivers/cxl/core/hdm.c > +++ b/drivers/cxl/core/hdm.c > @@ -172,7 +172,7 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld, > return -ENXIO; > } > > - cxld->decoder_range = (struct range) { > + cxld->range = (struct range) { > .start = base, > .end = base + size - 1, > }; > diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c > index 74c8e47bf915..86f451ecb7ed 100644 > --- a/drivers/cxl/core/port.c > +++ b/drivers/cxl/core/port.c > @@ -73,14 +73,8 @@ static ssize_t start_show(struct device *dev, struct device_attribute *attr, > char *buf) > { > struct cxl_decoder *cxld = to_cxl_decoder(dev); > - u64 start; > > - if (is_root_decoder(dev)) > - start = cxld->platform_res.start; > - else > - start = cxld->decoder_range.start; > - > - return sysfs_emit(buf, "%#llx\n", start); > + return sysfs_emit(buf, "%#llx\n", cxld->range.start); > } > static DEVICE_ATTR_ADMIN_RO(start); > > @@ -88,14 +82,8 @@ static ssize_t size_show(struct device *dev, struct device_attribute *attr, > char *buf) > { > struct cxl_decoder *cxld = to_cxl_decoder(dev); > - u64 size; > > - if (is_root_decoder(dev)) > - size = resource_size(&cxld->platform_res); > - else > - size = range_len(&cxld->decoder_range); > - > - return sysfs_emit(buf, "%#llx\n", size); > + return sysfs_emit(buf, "%#llx\n", range_len(&cxld->range)); > } > static DEVICE_ATTR_RO(size); > > @@ -1228,7 +1216,10 @@ static struct cxl_decoder *cxl_decoder_alloc(struct cxl_port *port, > cxld->interleave_ways = 1; > cxld->interleave_granularity = PAGE_SIZE; > cxld->target_type = CXL_DECODER_EXPANDER; > - cxld->platform_res = (struct resource)DEFINE_RES_MEM(0, 0); > + cxld->range = (struct range) { > + .start = 0, > + .end = -1, > + }; > > return cxld; > err: > @@ -1342,13 +1333,6 @@ int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map) > if (rc) > return rc; > > - /* > - * Platform decoder resources should show up with a reasonable name. All > - * other resources are just sub ranges within the main decoder resource. > - */ > - if (is_root_decoder(dev)) > - cxld->platform_res.name = dev_name(dev); > - > return device_add(dev); > } > EXPORT_SYMBOL_NS_GPL(cxl_decoder_add_locked, CXL); > diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h > index 5102491e8d13..6517d5cdf5ee 100644 > --- a/drivers/cxl/cxl.h > +++ b/drivers/cxl/cxl.h > @@ -197,8 +197,7 @@ enum cxl_decoder_type { > * struct cxl_decoder - CXL address range decode configuration > * @dev: this decoder's device > * @id: kernel device name id > - * @platform_res: address space resources considered by root decoder > - * @decoder_range: address space resources considered by midlevel decoder > + * @range: address range considered by this decoder > * @interleave_ways: number of cxl_dports in this decode > * @interleave_granularity: data stride per dport > * @target_type: accelerator vs expander (type2 vs type3) selector > @@ -210,10 +209,7 @@ enum cxl_decoder_type { > struct cxl_decoder { > struct device dev; > int id; > - union { > - struct resource platform_res; > - struct range decoder_range; > - }; > + struct range range; > int interleave_ways; > int interleave_granularity; > enum cxl_decoder_type target_type; > -- > 2.35.1 >
On 22-04-13 14:43:48, Dan Williams wrote: > On Wed, Apr 13, 2022 at 11:38 AM Ben Widawsky <ben.widawsky@intel.com> wrote: > > > > This reverts commit 608135db1b790170d22848815c4671407af74e37. All > > Did checkpatch not complain about this being in "commit > <12-character-commit-id> <commit summary format>"? However, I'd rather > just drop the revert language and say: > > Change root decoders to reuse the existing ->range field to track the > decoder's programmed HPA range. The infrastructure to track the > allocations out of the root decoder range is still a work-in-progress, > but in the meantime it simplifies the code to always represent the > current decoder range setting in the ->range field regardless of > decoder type. > > > decoders do have a host physical address space and the revert allows us > > to keep that uniformity. Decoder disambiguation will allow for decoder > > type-specific members which is needed, but will be handled separately. > > > > Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> > > > > --- > > The explanation for why it is impossible to make CFMWS ranges be > > iomem_resources is explain in a later patch. > > This change stands alone / is independent of any iomem_resource concerns, right? > I think I need to revisit this per the discussion at LSFMM. Ideally a CFMWS resource would just be insert_resource()'d, but that won't work. I'm going to attempt what we discussed and this patch will likely go away. > > --- > > drivers/cxl/acpi.c | 17 ++++++++++------- > > drivers/cxl/core/hdm.c | 2 +- > > drivers/cxl/core/port.c | 28 ++++++---------------------- > > drivers/cxl/cxl.h | 8 ++------ > > 4 files changed, 19 insertions(+), 36 deletions(-) > > > > diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c > > index d15a6aec0331..9b69955b90cb 100644 > > --- a/drivers/cxl/acpi.c > > +++ b/drivers/cxl/acpi.c > > @@ -108,8 +108,10 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, > > > > cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); > > cxld->target_type = CXL_DECODER_EXPANDER; > > - cxld->platform_res = (struct resource)DEFINE_RES_MEM(cfmws->base_hpa, > > - cfmws->window_size); > > + cxld->range = (struct range){ > > + .start = cfmws->base_hpa, > > + .end = cfmws->base_hpa + cfmws->window_size - 1, > > + }; > > cxld->interleave_ways = CFMWS_INTERLEAVE_WAYS(cfmws); > > cxld->interleave_granularity = CFMWS_INTERLEAVE_GRANULARITY(cfmws); > > > > @@ -119,13 +121,14 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, > > else > > rc = cxl_decoder_autoremove(dev, cxld); > > if (rc) { > > - dev_err(dev, "Failed to add decoder for %pr\n", > > - &cxld->platform_res); > > + dev_err(dev, "Failed to add decoder for %#llx-%#llx\n", > > + cfmws->base_hpa, > > + cfmws->base_hpa + cfmws->window_size - 1); > > return 0; > > } > > - dev_dbg(dev, "add: %s node: %d range %pr\n", dev_name(&cxld->dev), > > - phys_to_target_node(cxld->platform_res.start), > > - &cxld->platform_res); > > + dev_dbg(dev, "add: %s node: %d range %#llx-%#llx\n", > > + dev_name(&cxld->dev), phys_to_target_node(cxld->range.start), > > + cfmws->base_hpa, cfmws->base_hpa + cfmws->window_size - 1); > > > > return 0; > > } > > diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c > > index c3c021b54079..3055e246aab9 100644 > > --- a/drivers/cxl/core/hdm.c > > +++ b/drivers/cxl/core/hdm.c > > @@ -172,7 +172,7 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld, > > return -ENXIO; > > } > > > > - cxld->decoder_range = (struct range) { > > + cxld->range = (struct range) { > > .start = base, > > .end = base + size - 1, > > }; > > diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c > > index 74c8e47bf915..86f451ecb7ed 100644 > > --- a/drivers/cxl/core/port.c > > +++ b/drivers/cxl/core/port.c > > @@ -73,14 +73,8 @@ static ssize_t start_show(struct device *dev, struct device_attribute *attr, > > char *buf) > > { > > struct cxl_decoder *cxld = to_cxl_decoder(dev); > > - u64 start; > > > > - if (is_root_decoder(dev)) > > - start = cxld->platform_res.start; > > - else > > - start = cxld->decoder_range.start; > > - > > - return sysfs_emit(buf, "%#llx\n", start); > > + return sysfs_emit(buf, "%#llx\n", cxld->range.start); > > } > > static DEVICE_ATTR_ADMIN_RO(start); > > > > @@ -88,14 +82,8 @@ static ssize_t size_show(struct device *dev, struct device_attribute *attr, > > char *buf) > > { > > struct cxl_decoder *cxld = to_cxl_decoder(dev); > > - u64 size; > > > > - if (is_root_decoder(dev)) > > - size = resource_size(&cxld->platform_res); > > - else > > - size = range_len(&cxld->decoder_range); > > - > > - return sysfs_emit(buf, "%#llx\n", size); > > + return sysfs_emit(buf, "%#llx\n", range_len(&cxld->range)); > > } > > static DEVICE_ATTR_RO(size); > > > > @@ -1228,7 +1216,10 @@ static struct cxl_decoder *cxl_decoder_alloc(struct cxl_port *port, > > cxld->interleave_ways = 1; > > cxld->interleave_granularity = PAGE_SIZE; > > cxld->target_type = CXL_DECODER_EXPANDER; > > - cxld->platform_res = (struct resource)DEFINE_RES_MEM(0, 0); > > + cxld->range = (struct range) { > > + .start = 0, > > + .end = -1, > > + }; > > > > return cxld; > > err: > > @@ -1342,13 +1333,6 @@ int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map) > > if (rc) > > return rc; > > > > - /* > > - * Platform decoder resources should show up with a reasonable name. All > > - * other resources are just sub ranges within the main decoder resource. > > - */ > > - if (is_root_decoder(dev)) > > - cxld->platform_res.name = dev_name(dev); > > - > > return device_add(dev); > > } > > EXPORT_SYMBOL_NS_GPL(cxl_decoder_add_locked, CXL); > > diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h > > index 5102491e8d13..6517d5cdf5ee 100644 > > --- a/drivers/cxl/cxl.h > > +++ b/drivers/cxl/cxl.h > > @@ -197,8 +197,7 @@ enum cxl_decoder_type { > > * struct cxl_decoder - CXL address range decode configuration > > * @dev: this decoder's device > > * @id: kernel device name id > > - * @platform_res: address space resources considered by root decoder > > - * @decoder_range: address space resources considered by midlevel decoder > > + * @range: address range considered by this decoder > > * @interleave_ways: number of cxl_dports in this decode > > * @interleave_granularity: data stride per dport > > * @target_type: accelerator vs expander (type2 vs type3) selector > > @@ -210,10 +209,7 @@ enum cxl_decoder_type { > > struct cxl_decoder { > > struct device dev; > > int id; > > - union { > > - struct resource platform_res; > > - struct range decoder_range; > > - }; > > + struct range range; > > int interleave_ways; > > int interleave_granularity; > > enum cxl_decoder_type target_type; > > -- > > 2.35.1 > >
diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index d15a6aec0331..9b69955b90cb 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -108,8 +108,10 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); cxld->target_type = CXL_DECODER_EXPANDER; - cxld->platform_res = (struct resource)DEFINE_RES_MEM(cfmws->base_hpa, - cfmws->window_size); + cxld->range = (struct range){ + .start = cfmws->base_hpa, + .end = cfmws->base_hpa + cfmws->window_size - 1, + }; cxld->interleave_ways = CFMWS_INTERLEAVE_WAYS(cfmws); cxld->interleave_granularity = CFMWS_INTERLEAVE_GRANULARITY(cfmws); @@ -119,13 +121,14 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, else rc = cxl_decoder_autoremove(dev, cxld); if (rc) { - dev_err(dev, "Failed to add decoder for %pr\n", - &cxld->platform_res); + dev_err(dev, "Failed to add decoder for %#llx-%#llx\n", + cfmws->base_hpa, + cfmws->base_hpa + cfmws->window_size - 1); return 0; } - dev_dbg(dev, "add: %s node: %d range %pr\n", dev_name(&cxld->dev), - phys_to_target_node(cxld->platform_res.start), - &cxld->platform_res); + dev_dbg(dev, "add: %s node: %d range %#llx-%#llx\n", + dev_name(&cxld->dev), phys_to_target_node(cxld->range.start), + cfmws->base_hpa, cfmws->base_hpa + cfmws->window_size - 1); return 0; } diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c index c3c021b54079..3055e246aab9 100644 --- a/drivers/cxl/core/hdm.c +++ b/drivers/cxl/core/hdm.c @@ -172,7 +172,7 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld, return -ENXIO; } - cxld->decoder_range = (struct range) { + cxld->range = (struct range) { .start = base, .end = base + size - 1, }; diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 74c8e47bf915..86f451ecb7ed 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -73,14 +73,8 @@ static ssize_t start_show(struct device *dev, struct device_attribute *attr, char *buf) { struct cxl_decoder *cxld = to_cxl_decoder(dev); - u64 start; - if (is_root_decoder(dev)) - start = cxld->platform_res.start; - else - start = cxld->decoder_range.start; - - return sysfs_emit(buf, "%#llx\n", start); + return sysfs_emit(buf, "%#llx\n", cxld->range.start); } static DEVICE_ATTR_ADMIN_RO(start); @@ -88,14 +82,8 @@ static ssize_t size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct cxl_decoder *cxld = to_cxl_decoder(dev); - u64 size; - if (is_root_decoder(dev)) - size = resource_size(&cxld->platform_res); - else - size = range_len(&cxld->decoder_range); - - return sysfs_emit(buf, "%#llx\n", size); + return sysfs_emit(buf, "%#llx\n", range_len(&cxld->range)); } static DEVICE_ATTR_RO(size); @@ -1228,7 +1216,10 @@ static struct cxl_decoder *cxl_decoder_alloc(struct cxl_port *port, cxld->interleave_ways = 1; cxld->interleave_granularity = PAGE_SIZE; cxld->target_type = CXL_DECODER_EXPANDER; - cxld->platform_res = (struct resource)DEFINE_RES_MEM(0, 0); + cxld->range = (struct range) { + .start = 0, + .end = -1, + }; return cxld; err: @@ -1342,13 +1333,6 @@ int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map) if (rc) return rc; - /* - * Platform decoder resources should show up with a reasonable name. All - * other resources are just sub ranges within the main decoder resource. - */ - if (is_root_decoder(dev)) - cxld->platform_res.name = dev_name(dev); - return device_add(dev); } EXPORT_SYMBOL_NS_GPL(cxl_decoder_add_locked, CXL); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 5102491e8d13..6517d5cdf5ee 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -197,8 +197,7 @@ enum cxl_decoder_type { * struct cxl_decoder - CXL address range decode configuration * @dev: this decoder's device * @id: kernel device name id - * @platform_res: address space resources considered by root decoder - * @decoder_range: address space resources considered by midlevel decoder + * @range: address range considered by this decoder * @interleave_ways: number of cxl_dports in this decode * @interleave_granularity: data stride per dport * @target_type: accelerator vs expander (type2 vs type3) selector @@ -210,10 +209,7 @@ enum cxl_decoder_type { struct cxl_decoder { struct device dev; int id; - union { - struct resource platform_res; - struct range decoder_range; - }; + struct range range; int interleave_ways; int interleave_granularity; enum cxl_decoder_type target_type;
This reverts commit 608135db1b790170d22848815c4671407af74e37. All decoders do have a host physical address space and the revert allows us to keep that uniformity. Decoder disambiguation will allow for decoder type-specific members which is needed, but will be handled separately. Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> --- The explanation for why it is impossible to make CFMWS ranges be iomem_resources is explain in a later patch. --- drivers/cxl/acpi.c | 17 ++++++++++------- drivers/cxl/core/hdm.c | 2 +- drivers/cxl/core/port.c | 28 ++++++---------------------- drivers/cxl/cxl.h | 8 ++------ 4 files changed, 19 insertions(+), 36 deletions(-)