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drm/i915/guc: Speed up GuC log dumps

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Add support for telling the debugfs interface the size of the GuC log
dump in advance. Without that, the underlying framework keeps calling
the 'show' function with larger and larger buffer allocations until it
fits. That means reading the log from graphics memory many times - 16
times with the full 18MB log size.

v2: Don't return error codes from size query. Report overflow in the
error dump as well (review feedback from Daniele).

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211211065859.2248188-2-John.C.Harrison@Intel.com
This commit is contained in:
John Harrison
2021-12-10 22:58:56 -08:00
parent 9606ca2ea1
commit 57b427a705
2 changed files with 71 additions and 8 deletions
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21
drivers/gpu/drm/i915/gt/intel_gt_debugfs.h
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@@ -10,11 +10,7 @@
struct intel_gt;
#define DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(__name) \
static int __name ## _open(struct inode *inode, struct file *file) \
{ \
return single_open(file, __name ## _show, inode->i_private); \
} \
#define __GT_DEBUGFS_ATTRIBUTE_FOPS(__name) \
static const struct file_operations __name ## _fops = { \
.owner = THIS_MODULE, \
.open = __name ## _open, \
@@ -23,6 +19,21 @@ static const struct file_operations __name ## _fops = { \
.release = single_release, \
}
#define DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(__name) \
static int __name ## _open(struct inode *inode, struct file *file) \
{ \
return single_open(file, __name ## _show, inode->i_private); \
} \
__GT_DEBUGFS_ATTRIBUTE_FOPS(__name)
#define DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE_WITH_SIZE(__name, __size_vf) \
static int __name ## _open(struct inode *inode, struct file *file) \
{ \
return single_open_size(file, __name ## _show, inode->i_private, \
__size_vf(inode->i_private)); \
} \
__GT_DEBUGFS_ATTRIBUTE_FOPS(__name)
void intel_gt_debugfs_register(struct intel_gt *gt);
struct intel_gt_debugfs_file {