Re: [PATCH] of: give priority to the compatible match in __of_match_node()
From: Grant Likely <hidden>
Date: 2014-02-19 22:40:51
Also in:
linuxppc-dev
On Wed, 19 Feb 2014 16:23:02 -0500, Paul Gortmaker [off-list ref] wrote:
On 14-02-19 03:41 PM, Grant Likely wrote:quoted
On Wed, 19 Feb 2014 13:25:54 -0500, Paul Gortmaker [off-list ref] wrote:quoted
On Thu, Feb 13, 2014 at 2:01 PM, Rob Herring [off-list ref] wrote:quoted
On Wed, Feb 12, 2014 at 5:38 AM, Kevin Hao [off-list ref] wrote:quoted
When the device node do have a compatible property, we definitely prefer the compatible match besides the type and name. Only if there is no such a match, we then consider the candidate which doesn't have compatible entry but do match the type or name with the device node. This is based on a patch from Sebastian Hesselbarth. http://patchwork.ozlabs.org/patch/319434/ I did some code refactoring and also fixed a bug in the original patch.I'm inclined to just revert this once again and avoid possibly breaking yet another platform.Well, for what it is worth, today's (Feb19th) linux-next tree fails to boot on my sbc8548. It fails with:I think I've got it fixed now with the latest series. Please try the devicetree/merge branch on git://git.secretlab.ca/git/linuxThat seems to work.
Great, thanks for the testing. Can I add a Tested-by line for you? g.
libphy: Freescale PowerQUICC MII Bus: probed libphy: Freescale PowerQUICC MII Bus: probed fsl-gianfar e0024000.ethernet: enabled errata workarounds, flags: 0x4 fsl-gianfar e0024000.ethernet eth0: mac: 02:e0:0c:00:05:fd fsl-gianfar e0024000.ethernet eth0: Running with NAPI enabled fsl-gianfar e0024000.ethernet eth0: RX BD ring size for Q[0]: 256 fsl-gianfar e0024000.ethernet eth0: TX BD ring size for Q[0]: 256 fsl-gianfar e0025000.ethernet: enabled errata workarounds, flags: 0x4 fsl-gianfar e0025000.ethernet eth1: mac: 02:e0:0c:00:06:fd fsl-gianfar e0025000.ethernet eth1: Running with NAPI enabled fsl-gianfar e0025000.ethernet eth1: RX BD ring size for Q[0]: 256 fsl-gianfar e0025000.ethernet eth1: TX BD ring size for Q[0]: 256 TCP: cubic registered Initializing XFRM netlink socket NET: Registered protocol family 17 ... root@sbc8548:~# cat /proc/version Linux version 3.14.0-rc3-00024-g7119f42057c6 (paul@yow-lpgnfs-02) (gcc version 4.5.2 (GCC) ) #1 Wed Feb 19 16:08:17 EST 2014 root@sbc8548:~# Paul. --quoted
g.quoted
----------------------------------------------- libphy: Freescale PowerQUICC MII Bus: probed mdio_bus ethernet@e002400: /soc8548@e0000000/ethernet@24000/mdio@520 PHY address 1312 is too large libphy: Freescale PowerQUICC MII Bus: probed libphy: Freescale PowerQUICC MII Bus: probed mdio_bus ethernet@e002500: /soc8548@e0000000/ethernet@25000/mdio@520 PHY address 1312 is too large libphy: Freescale PowerQUICC MII Bus: probed TCP: cubic registered Initializing XFRM netlink socket NET: Registered protocol family 17 <fail nfs mount> ----------------------------------------------- On a normal boot, we should see this: ----------------------------------------------- libphy: Freescale PowerQUICC MII Bus: probed libphy: Freescale PowerQUICC MII Bus: probed fsl-gianfar e0024000.ethernet: enabled errata workarounds, flags: 0x4 fsl-gianfar e0024000.ethernet eth0: mac: 02:e0:0c:00:05:fd fsl-gianfar e0024000.ethernet eth0: Running with NAPI enabled fsl-gianfar e0024000.ethernet eth0: RX BD ring size for Q[0]: 256 fsl-gianfar e0024000.ethernet eth0: TX BD ring size for Q[0]: 256 fsl-gianfar e0025000.ethernet: enabled errata workarounds, flags: 0x4 fsl-gianfar e0025000.ethernet eth1: mac: 02:e0:0c:00:06:fd fsl-gianfar e0025000.ethernet eth1: Running with NAPI enabled fsl-gianfar e0025000.ethernet eth1: RX BD ring size for Q[0]: 256 fsl-gianfar e0025000.ethernet eth1: TX BD ring size for Q[0]: 256 TCP: cubic registered Initializing XFRM netlink socket NET: Registered protocol family 17 ----------------------------------------------- Git bisect says: ee8b26ad943aa34acc03ae6cde2b81d8d3d483d4 is the first bad commit commit ee8b26ad943aa34acc03ae6cde2b81d8d3d483d4 Author: Kevin Hao [off-list ref] Date: Tue Feb 18 15:57:30 2014 +0800 of: reimplement the matching method for __of_match_node() In the current implementation of __of_match_node(), it will compare each given match entry against all the node's compatible strings with of_device_is_compatible(). To achieve multiple compatible strings per node with ordering from specific to generic, this requires given matches to be ordered from specific to generic. For most of the drivers this is not true and also an alphabetical ordering is more sane there. Therefore, we define a following priority order for the match, and then scan all the entries to find the best match. 1. specific compatible && type && name 2. specific compatible && type 3. specific compatible && name 4. specific compatible 5. general compatible && type && name 6. general compatible && type 7. general compatible && name 8. general compatible 9. type && name 10. type 11. name This is based on some pseudo-codes provided by Grant Likely. Signed-off-by: Kevin Hao [off-list ref] [grant.likely: Changed multiplier to 4 which makes more sense] Signed-off-by: Grant Likely [off-list ref] :040000 040000 8f5dd19174417aece63b308ff299a5dbe2efa5a0 8401b0e3903e23e973845ee75b26b04345d803d2 M drivers As a double check, I checked out the head of linux-next, and did a revert of the above commit, and my sbc8548 can then boot properly. Not doing anything fancy ; using the defconfig exactly as-is, and ensuring the dtb is fresh from linux-next HEAD of today. Thanks, Paul. --quoted
However, I think I would like to see this structured differently. We basically have 2 ways of matching: the existing pre-3.14 way and the desired match on best compatible only. All new bindings should match with the new way and the old way needs to be kept for compatibility. So lets structure the code that way. Search the match table first for best compatible with name and type NULL, then search the table the old way. I realize it appears you are doing this, but it is not clear this is the intent of the code. I would like to see this written as a patch with commit 105353145eafb3ea919 reverted first and you add a new match function to call first and then fallback to the existing function. Robquoted
Cc: Sebastian Hesselbarth <redacted> Signed-off-by: Kevin Hao <redacted> --- drivers/of/base.c | 55 +++++++++++++++++++++++++++++++++++++------------------ 1 file changed, 37 insertions(+), 18 deletions(-)diff --git a/drivers/of/base.c b/drivers/of/base.c index ff85450d5683..9d655df458bd 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c@@ -730,32 +730,45 @@ out: } EXPORT_SYMBOL(of_find_node_with_property); +static int of_match_type_or_name(const struct device_node *node, + const struct of_device_id *m) +{ + int match = 1; + + if (m->name[0]) + match &= node->name && !strcmp(m->name, node->name); + + if (m->type[0]) + match &= node->type && !strcmp(m->type, node->type); + + return match; +} + static const struct of_device_id *__of_match_node(const struct of_device_id *matches, const struct device_node *node) { const char *cp; int cplen, l; + const struct of_device_id *m; + int match; if (!matches) return NULL; cp = __of_get_property(node, "compatible", &cplen); - do { - const struct of_device_id *m = matches; + while (cp && (cplen > 0)) { + m = matches; /* Check against matches with current compatible string */ while (m->name[0] || m->type[0] || m->compatible[0]) { - int match = 1; - if (m->name[0]) - match &= node->name - && !strcmp(m->name, node->name); - if (m->type[0]) - match &= node->type - && !strcmp(m->type, node->type); - if (m->compatible[0]) - match &= cp - && !of_compat_cmp(m->compatible, cp, + if (!m->compatible[0]) { + m++; + continue; + } + + match = of_match_type_or_name(node, m); + match &= cp && !of_compat_cmp(m->compatible, cp, strlen(m->compatible)); if (match) return m;@@ -763,12 +776,18 @@ const struct of_device_id *__of_match_node(const struct of_device_id *matches, } /* Get node's next compatible string */ - if (cp) { - l = strlen(cp) + 1; - cp += l; - cplen -= l; - } - } while (cp && (cplen > 0)); + l = strlen(cp) + 1; + cp += l; + cplen -= l; + } + + m = matches; + /* Check against matches without compatible string */ + while (m->name[0] || m->type[0] || m->compatible[0]) { + if (!m->compatible[0] && of_match_type_or_name(node, m)) + return m; + m++; + } return NULL; } --1.8.5.3 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html_______________________________________________ Linuxppc-dev mailing list Linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org https://lists.ozlabs.org/listinfo/linuxppc-dev
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