[PATCH v3] pci: Handle 5-bit and 8-bit tag field

[PATCH v3] pci: Handle 5-bit and 8-bit tag field

[Pierre Moreau]

If the hardware supports extended tag field (8-bit ones), then enabled it. This
is usually done by the VBIOS, but not on some MBPs (see fdo#86537).
In case extended tag field is not supported, 5-bit tag field is used which
limits the possible values to 32. Apparently bits 7:0 of 0x8841c stores some
number of outstanding requests, so cap it to 32 if extended tag is unsupported.

Fixes: fdo#86537

v2: Restrict changes to chipsets >= 0x84
v3:
  * Add nvkm_pci_mask to pci.h
  * Mask bit 8 before setting it

Signed-off-by: Pierre Moreau <pierre.morrow@free.fr>
---
 drm/nouveau/include/nvkm/subdev/pci.h |  1 +
 drm/nouveau/nvkm/subdev/pci/base.c    | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/drm/nouveau/include/nvkm/subdev/pci.h b/drm/nouveau/include/nvkm/subdev/pci.h
index 5b3c054..774ca66 100644
--- a/drm/nouveau/include/nvkm/subdev/pci.h
+++ b/drm/nouveau/include/nvkm/subdev/pci.h
@@ -24,6 +24,7 @@ struct nvkm_pci {
 u32 nvkm_pci_rd32(struct nvkm_pci *, u16 addr);
 void nvkm_pci_wr08(struct nvkm_pci *, u16 addr, u8 data);
 void nvkm_pci_wr32(struct nvkm_pci *, u16 addr, u32 data);
+u32 nvkm_pci_mask(struct nvkm_pci *, u16 addr, u32 mask, u32 add);
 void nvkm_pci_rom_shadow(struct nvkm_pci *, bool shadow);
 
 int nv04_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
diff --git a/drm/nouveau/nvkm/subdev/pci/base.c b/drm/nouveau/nvkm/subdev/pci/base.c
index d1c148e..cb2835b 100644
--- a/drm/nouveau/nvkm/subdev/pci/base.c
+++ b/drm/nouveau/nvkm/subdev/pci/base.c
@@ -46,6 +46,14 @@ nvkm_pci_wr32(struct nvkm_pci *pci, u16 addr, u32 data)
 	pci->func->wr32(pci, addr, data);
 }
 
+u32
+nvkm_pci_mask(struct nvkm_pci *pci, u16 addr, u32 mask, u32 add)
+{
+	u32 data = pci->func->rd32(pci, addr);
+	pci->func->wr32(pci, addr, (data & ~mask) | add);
+	return data;
+}
+
 void
 nvkm_pci_rom_shadow(struct nvkm_pci *pci, bool shadow)
 {
@@ -115,6 +123,23 @@ nvkm_pci_init(struct nvkm_subdev *subdev)
 	if (ret)
 		return ret;
 
+	if (pci_is_pcie(pdev) && subdev->device->chipset >= 0x84) {
+		/* Tag field is 8-bit long, regardless of EXT_TAG.
+		 * However, if EXT_TAG is disabled, only the lower 5 bits of the tag
+		 * field should be used, limiting the number of request to 32.
+		 *
+		 * Apparently, 0x041c stores some limit on the number of requests
+		 * possible, so if EXT_TAG is disabled, limit that requests number to
+		 * 32
+		 *
+		 * Fixes fdo#86537
+		 */
+		if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020)
+			nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);
+		else
+			nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
+	}
+
 	pci->irq = pdev->irq;
 	return ret;
 }
-- 
2.5.2

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Re: [PATCH v3] pci: Handle 5-bit and 8-bit tag field

[Pierre Moreau]

----- Mail original -----
> If the hardware supports extended tag field (8-bit ones), then
> enabled it. This
> is usually done by the VBIOS, but not on some MBPs (see fdo#86537).
> In case extended tag field is not supported, 5-bit tag field is used
> which
> limits the possible values to 32. Apparently bits 7:0 of 0x8841c
> stores some
> number of outstanding requests, so cap it to 32 if extended tag is
> unsupported.
> 
> Fixes: fdo#86537
> 
> v2: Restrict changes to chipsets >= 0x84
> v3:
>   * Add nvkm_pci_mask to pci.h
>   * Mask bit 8 before setting it
> 
> Signed-off-by: Pierre Moreau <pierre.morrow@free.fr>

Tested-by: Karol Herbst <freedesktop@karolherbst.de>

> ---
>  drm/nouveau/include/nvkm/subdev/pci.h |  1 +
>  drm/nouveau/nvkm/subdev/pci/base.c    | 25 +++++++++++++++++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/drm/nouveau/include/nvkm/subdev/pci.h
> b/drm/nouveau/include/nvkm/subdev/pci.h
> index 5b3c054..774ca66 100644
> --- a/drm/nouveau/include/nvkm/subdev/pci.h
> +++ b/drm/nouveau/include/nvkm/subdev/pci.h
> @@ -24,6 +24,7 @@ struct nvkm_pci {
>  u32 nvkm_pci_rd32(struct nvkm_pci *, u16 addr);
>  void nvkm_pci_wr08(struct nvkm_pci *, u16 addr, u8 data);
>  void nvkm_pci_wr32(struct nvkm_pci *, u16 addr, u32 data);
> +u32 nvkm_pci_mask(struct nvkm_pci *, u16 addr, u32 mask, u32 add);
>  void nvkm_pci_rom_shadow(struct nvkm_pci *, bool shadow);
>  
>  int nv04_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
> diff --git a/drm/nouveau/nvkm/subdev/pci/base.c
> b/drm/nouveau/nvkm/subdev/pci/base.c
> index d1c148e..cb2835b 100644
> --- a/drm/nouveau/nvkm/subdev/pci/base.c
> +++ b/drm/nouveau/nvkm/subdev/pci/base.c
> @@ -46,6 +46,14 @@ nvkm_pci_wr32(struct nvkm_pci *pci, u16 addr, u32
> data)
>  	pci->func->wr32(pci, addr, data);
>  }
>  
> +u32
> +nvkm_pci_mask(struct nvkm_pci *pci, u16 addr, u32 mask, u32 add)
> +{
> +	u32 data = pci->func->rd32(pci, addr);
> +	pci->func->wr32(pci, addr, (data & ~mask) | add);
> +	return data;
> +}
> +
>  void
>  nvkm_pci_rom_shadow(struct nvkm_pci *pci, bool shadow)
>  {
> @@ -115,6 +123,23 @@ nvkm_pci_init(struct nvkm_subdev *subdev)
>  	if (ret)
>  		return ret;
>  
> +	if (pci_is_pcie(pdev) && subdev->device->chipset >= 0x84) {
> +		/* Tag field is 8-bit long, regardless of EXT_TAG.
> +		 * However, if EXT_TAG is disabled, only the lower 5 bits of the
> tag
> +		 * field should be used, limiting the number of request to 32.
> +		 *
> +		 * Apparently, 0x041c stores some limit on the number of requests
> +		 * possible, so if EXT_TAG is disabled, limit that requests number
> to
> +		 * 32
> +		 *
> +		 * Fixes fdo#86537
> +		 */
> +		if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020)
> +			nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);
> +		else
> +			nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
> +	}
> +
>  	pci->irq = pdev->irq;
>  	return ret;
>  }
> --
> 2.5.2
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
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Re: [PATCH v3] pci: Handle 5-bit and 8-bit tag field

[Ben Skeggs]

On 09/17/2015 06:26 AM, Pierre Moreau wrote:
> If the hardware supports extended tag field (8-bit ones), then
> enabled it. This is usually done by the VBIOS, but not on some MBPs
> (see fdo#86537). In case extended tag field is not supported, 5-bit
> tag field is used which limits the possible values to 32.
> Apparently bits 7:0 of 0x8841c stores some number of outstanding
> requests, so cap it to 32 if extended tag is unsupported.
> 
> Fixes: fdo#86537
> 
> v2: Restrict changes to chipsets >= 0x84 v3: * Add nvkm_pci_mask to
> pci.h * Mask bit 8 before setting it
> 
> Signed-off-by: Pierre Moreau <pierre.morrow@free.fr> --- 
> drm/nouveau/include/nvkm/subdev/pci.h |  1 + 
> drm/nouveau/nvkm/subdev/pci/base.c    | 25
> +++++++++++++++++++++++++ 2 files changed, 26 insertions(+)
> 
> diff --git a/drm/nouveau/include/nvkm/subdev/pci.h
> b/drm/nouveau/include/nvkm/subdev/pci.h index 5b3c054..774ca66
> 100644 --- a/drm/nouveau/include/nvkm/subdev/pci.h +++
> b/drm/nouveau/include/nvkm/subdev/pci.h @@ -24,6 +24,7 @@ struct
> nvkm_pci { u32 nvkm_pci_rd32(struct nvkm_pci *, u16 addr); void
> nvkm_pci_wr08(struct nvkm_pci *, u16 addr, u8 data); void
> nvkm_pci_wr32(struct nvkm_pci *, u16 addr, u32 data); +u32
> nvkm_pci_mask(struct nvkm_pci *, u16 addr, u32 mask, u32 add); void
> nvkm_pci_rom_shadow(struct nvkm_pci *, bool shadow);
> 
> int nv04_pci_new(struct nvkm_device *, int, struct nvkm_pci **); 
> diff --git a/drm/nouveau/nvkm/subdev/pci/base.c
> b/drm/nouveau/nvkm/subdev/pci/base.c index d1c148e..cb2835b 100644 
> --- a/drm/nouveau/nvkm/subdev/pci/base.c +++
> b/drm/nouveau/nvkm/subdev/pci/base.c @@ -46,6 +46,14 @@
> nvkm_pci_wr32(struct nvkm_pci *pci, u16 addr, u32 data) 
> pci->func->wr32(pci, addr, data); }
> 
> +u32 +nvkm_pci_mask(struct nvkm_pci *pci, u16 addr, u32 mask, u32
> add) +{ +	u32 data = pci->func->rd32(pci, addr); +
> pci->func->wr32(pci, addr, (data & ~mask) | add); +	return data; 
> +} + void nvkm_pci_rom_shadow(struct nvkm_pci *pci, bool shadow) { 
> @@ -115,6 +123,23 @@ nvkm_pci_init(struct nvkm_subdev *subdev) if
> (ret) return ret;
> 
> +	if (pci_is_pcie(pdev) && subdev->device->chipset >= 0x84) { +		/*
> Tag field is 8-bit long, regardless of EXT_TAG. +		 * However, if
> EXT_TAG is disabled, only the lower 5 bits of the tag +		 * field
> should be used, limiting the number of request to 32. +		 * +		 *
> Apparently, 0x041c stores some limit on the number of requests +
> * possible, so if EXT_TAG is disabled, limit that requests number
> to +		 * 32 +		 * +		 * Fixes fdo#86537 +		 */ +		if
> (nvkm_pci_rd32(pci, 0x007c) & 0x00000020) +			nvkm_pci_mask(pci,
> 0x0080, 0x00000100, 0x00000100); +		else +			nvkm_pci_mask(pci,
> 0x041c, 0x00000060, 0x00000000); +	}
Please introduce a .init() to nvkm_pci_func(), and implement a g84.c
that handles this (gf100.c can use g84_pci_init() from there).

The check for PCI-E is redundant too, all these boards are PCI-E.

Other than the above nit-picking, looks fine.

Thanks,
Ben.

> + pci->irq = pdev->irq; return ret; }
> 

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[PATCH v4] pci: Handle 5-bit and 8-bit tag field

[Pierre Moreau]

If the hardware supports extended tag field (8-bit ones), then enabled it. This
is usually done by the VBIOS, but not on some MBPs (see fdo#86537).
In case extended tag field is not supported, 5-bit tag field is used which
limits the possible values to 32. Apparently bits 7:0 of 0x8841c stores some
number of outstanding requests, so cap it to 32 if extended tag is unsupported.

Fixes: fdo#86537

v2: Restrict changes to chipsets >= 0x84
v3:
  * Add nvkm_pci_mask to pci.h
  * Mask bit 8 before setting it
v4:
  * Rename `add` argument of nvkm_pci_mask to `value`
  * Move code from nvkm_pci_init to g84_pci_init and remove PCIe and chipset
    checks

Signed-off-by: Pierre Moreau <pierre.morrow@free.fr>
---
 drm/nouveau/include/nvkm/subdev/pci.h |  4 +++
 drm/nouveau/nvkm/engine/device/base.c | 64 +++++++++++++++++------------------
 drm/nouveau/nvkm/subdev/pci/Kbuild    |  1 +
 drm/nouveau/nvkm/subdev/pci/base.c    | 43 ++++++++++++++++++++---
 drm/nouveau/nvkm/subdev/pci/g84.c     | 55 ++++++++++++++++++++++++++++++
 drm/nouveau/nvkm/subdev/pci/gf100.c   |  6 ++++
 drm/nouveau/nvkm/subdev/pci/nv40.c    |  6 ++++
 drm/nouveau/nvkm/subdev/pci/nv50.c    |  6 ++++
 drm/nouveau/nvkm/subdev/pci/priv.h    | 11 ++++++
 9 files changed, 159 insertions(+), 37 deletions(-)
 create mode 100644 drm/nouveau/nvkm/subdev/pci/g84.c

diff --git a/drm/nouveau/include/nvkm/subdev/pci.h b/drm/nouveau/include/nvkm/subdev/pci.h
index 5b3c054..ab79fd0 100644
--- a/drm/nouveau/include/nvkm/subdev/pci.h
+++ b/drm/nouveau/include/nvkm/subdev/pci.h
@@ -24,11 +24,15 @@ struct nvkm_pci {
 u32 nvkm_pci_rd32(struct nvkm_pci *, u16 addr);
 void nvkm_pci_wr08(struct nvkm_pci *, u16 addr, u8 data);
 void nvkm_pci_wr32(struct nvkm_pci *, u16 addr, u32 data);
+u32 nvkm_pci_mask(struct nvkm_pci *, u16 addr, u32 mask, u32 value);
 void nvkm_pci_rom_shadow(struct nvkm_pci *, bool shadow);
 
 int nv04_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
 int nv40_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
+int nv40_pci_new_g84_init(struct nvkm_device *, int, struct nvkm_pci **);
 int nv4c_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
 int nv50_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
+int nv50_pci_new_g84_init(struct nvkm_device *, int, struct nvkm_pci **);
 int gf100_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
+int gf100_pci_new_g84_init(struct nvkm_device *, int, struct nvkm_pci **);
 #endif
diff --git a/drm/nouveau/nvkm/engine/device/base.c b/drm/nouveau/nvkm/engine/device/base.c
index acc2fe9..9b19b52 100644
--- a/drm/nouveau/nvkm/engine/device/base.c
+++ b/drm/nouveau/nvkm/engine/device/base.c
@@ -929,7 +929,7 @@ nv84_chipset = {
 	.mc = nv50_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv50_pci_new,
+	.pci = nv50_pci_new_g84_init,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
 	.volt = nv40_volt_new,
@@ -961,7 +961,7 @@ nv86_chipset = {
 	.mc = nv50_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv50_pci_new,
+	.pci = nv50_pci_new_g84_init,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
 	.volt = nv40_volt_new,
@@ -993,7 +993,7 @@ nv92_chipset = {
 	.mc = nv50_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv50_pci_new,
+	.pci = nv50_pci_new_g84_init,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
 	.volt = nv40_volt_new,
@@ -1025,7 +1025,7 @@ nv94_chipset = {
 	.mc = nv50_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
 	.volt = nv40_volt_new,
@@ -1057,7 +1057,7 @@ nv96_chipset = {
 	.mc = nv50_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
 	.volt = nv40_volt_new,
@@ -1089,7 +1089,7 @@ nv98_chipset = {
 	.mc = g98_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
 	.volt = nv40_volt_new,
@@ -1121,7 +1121,7 @@ nva0_chipset = {
 	.mc = g98_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
 	.volt = nv40_volt_new,
@@ -1153,7 +1153,7 @@ nva3_chipset = {
 	.mc = g98_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gt215_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1187,7 +1187,7 @@ nva5_chipset = {
 	.mc = g98_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gt215_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1220,7 +1220,7 @@ nva8_chipset = {
 	.mc = g98_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gt215_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1253,7 +1253,7 @@ nvaa_chipset = {
 	.mc = g98_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
 	.volt = nv40_volt_new,
@@ -1285,7 +1285,7 @@ nvac_chipset = {
 	.mc = g98_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.therm = g84_therm_new,
 	.timer = nv41_timer_new,
 	.volt = nv40_volt_new,
@@ -1317,7 +1317,7 @@ nvaf_chipset = {
 	.mc = g98_mc_new,
 	.mmu = nv50_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gt215_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1352,7 +1352,7 @@ nvc0_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = gf100_pci_new,
+	.pci = gf100_pci_new_g84_init,
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1388,7 +1388,7 @@ nvc1_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1423,7 +1423,7 @@ nvc3_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1458,7 +1458,7 @@ nvc4_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = gf100_pci_new,
+	.pci = gf100_pci_new_g84_init,
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1494,7 +1494,7 @@ nvc8_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = gf100_pci_new,
+	.pci = gf100_pci_new_g84_init,
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1530,7 +1530,7 @@ nvce_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = gf100_pci_new,
+	.pci = gf100_pci_new_g84_init,
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1566,7 +1566,7 @@ nvcf_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gf100_pmu_new,
 	.therm = gt215_therm_new,
 	.timer = nv41_timer_new,
@@ -1601,7 +1601,7 @@ nvd7_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
 	.ce[0] = gf100_ce_new,
@@ -1634,7 +1634,7 @@ nvd9_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gf119_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
@@ -1669,7 +1669,7 @@ nve4_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gk104_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
@@ -1706,7 +1706,7 @@ nve6_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gk104_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
@@ -1743,7 +1743,7 @@ nve7_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gf119_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
@@ -1804,7 +1804,7 @@ nvf0_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gk110_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
@@ -1840,7 +1840,7 @@ nvf1_chipset = {
 	.mc = gf100_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gk110_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
@@ -1876,7 +1876,7 @@ nv106_chipset = {
 	.mc = gk20a_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gk208_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
@@ -1912,7 +1912,7 @@ nv108_chipset = {
 	.mc = gk20a_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gk208_pmu_new,
 	.therm = gf119_therm_new,
 	.timer = nv41_timer_new,
@@ -1948,7 +1948,7 @@ nv117_chipset = {
 	.mc = gk20a_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gm107_pmu_new,
 	.therm = gm107_therm_new,
 	.timer = gk20a_timer_new,
@@ -1979,7 +1979,7 @@ nv124_chipset = {
 	.mc = gk20a_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gm107_pmu_new,
 	.timer = gk20a_timer_new,
 	.volt = gk104_volt_new,
@@ -2010,7 +2010,7 @@ nv126_chipset = {
 	.mc = gk20a_mc_new,
 	.mmu = gf100_mmu_new,
 	.mxm = nv50_mxm_new,
-	.pci = nv40_pci_new,
+	.pci = nv40_pci_new_g84_init,
 	.pmu = gm107_pmu_new,
 	.timer = gk20a_timer_new,
 	.volt = gk104_volt_new,
diff --git a/drm/nouveau/nvkm/subdev/pci/Kbuild b/drm/nouveau/nvkm/subdev/pci/Kbuild
index 99672c3..57652f5 100644
--- a/drm/nouveau/nvkm/subdev/pci/Kbuild
+++ b/drm/nouveau/nvkm/subdev/pci/Kbuild
@@ -4,4 +4,5 @@ nvkm-y += nvkm/subdev/pci/nv04.o
 nvkm-y += nvkm/subdev/pci/nv40.o
 nvkm-y += nvkm/subdev/pci/nv4c.o
 nvkm-y += nvkm/subdev/pci/nv50.o
+nvkm-y += nvkm/subdev/pci/g84.o
 nvkm-y += nvkm/subdev/pci/gf100.o
diff --git a/drm/nouveau/nvkm/subdev/pci/base.c b/drm/nouveau/nvkm/subdev/pci/base.c
index d1c148e..7ad4796 100644
--- a/drm/nouveau/nvkm/subdev/pci/base.c
+++ b/drm/nouveau/nvkm/subdev/pci/base.c
@@ -46,6 +46,14 @@ nvkm_pci_wr32(struct nvkm_pci *pci, u16 addr, u32 data)
 	pci->func->wr32(pci, addr, data);
 }
 
+u32
+nvkm_pci_mask(struct nvkm_pci *pci, u16 valuer, u32 mask, u32 value)
+{
+	u32 data = pci->func->rd32(pci, valuer);
+	pci->func->wr32(pci, valuer, (data & ~mask) | value);
+	return data;
+}
+
 void
 nvkm_pci_rom_shadow(struct nvkm_pci *pci, bool shadow)
 {
@@ -73,7 +81,7 @@ nvkm_pci_intr(int irq, void *arg)
 	return handled ? IRQ_HANDLED : IRQ_NONE;
 }
 
-static int
+int
 nvkm_pci_fini(struct nvkm_subdev *subdev, bool suspend)
 {
 	struct nvkm_pci *pci = nvkm_pci(subdev);
@@ -89,7 +97,7 @@ nvkm_pci_fini(struct nvkm_subdev *subdev, bool suspend)
 	return 0;
 }
 
-static int
+int
 nvkm_pci_preinit(struct nvkm_subdev *subdev)
 {
 	struct nvkm_pci *pci = nvkm_pci(subdev);
@@ -98,7 +106,7 @@ nvkm_pci_preinit(struct nvkm_subdev *subdev)
 	return 0;
 }
 
-static int
+int
 nvkm_pci_init(struct nvkm_subdev *subdev)
 {
 	struct nvkm_pci *pci = nvkm_pci(subdev);
@@ -115,11 +123,28 @@ nvkm_pci_init(struct nvkm_subdev *subdev)
 	if (ret)
 		return ret;
 
+	if (pci_is_pcie(pdev) && subdev->device->chipset >= 0x84) {
+		/* Tag field is 8-bit long, regardless of EXT_TAG.
+		 * However, if EXT_TAG is disabled, only the lower 5 bits of the tag
+		 * field should be used, limiting the number of request to 32.
+		 *
+		 * Apparently, 0x041c stores some limit on the number of requests
+		 * possible, so if EXT_TAG is disabled, limit that requests number to
+		 * 32
+		 *
+		 * Fixes fdo#86537
+		 */
+		if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020)
+			nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);
+		else
+			nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
+	}
+
 	pci->irq = pdev->irq;
 	return ret;
 }
 
-static void *
+void *
 nvkm_pci_dtor(struct nvkm_subdev *subdev)
 {
 	struct nvkm_pci *pci = nvkm_pci(subdev);
@@ -141,11 +166,19 @@ int
 nvkm_pci_new_(const struct nvkm_pci_func *func, struct nvkm_device *device,
 	      int index, struct nvkm_pci **ppci)
 {
+	return nvkm_pci_new(&nvkm_pci_func, func, device, index, ppci);
+}
+
+int
+nvkm_pci_new(const struct nvkm_subdev_func *subdev_func,
+	     const struct nvkm_pci_func *func, struct nvkm_device *device,
+	     int index, struct nvkm_pci **ppci)
+{
 	struct nvkm_pci *pci;
 
 	if (!(pci = *ppci = kzalloc(sizeof(**ppci), GFP_KERNEL)))
 		return -ENOMEM;
-	nvkm_subdev_ctor(&nvkm_pci_func, device, index, 0, &pci->subdev);
+	nvkm_subdev_ctor(subdev_func, device, index, 0, &pci->subdev);
 	pci->func = func;
 	pci->pdev = device->func->pci(device)->pdev;
 	pci->irq = -1;
diff --git a/drm/nouveau/nvkm/subdev/pci/g84.c b/drm/nouveau/nvkm/subdev/pci/g84.c
new file mode 100644
index 0000000..202c07a
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/pci/g84.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2015 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+#include "priv.h"
+
+int
+g84_pci_init(struct nvkm_subdev *subdev)
+{
+	struct nvkm_pci *pci = nvkm_pci(subdev);
+
+	/* Tag field is 8-bit long, regardless of EXT_TAG.
+	 * However, if EXT_TAG is disabled, only the lower 5 bits of the tag
+	 * field should be used, limiting the number of request to 32.
+	 *
+	 * Apparently, 0x041c stores some limit on the number of requests
+	 * possible, so if EXT_TAG is disabled, limit that requests number to
+	 * 32
+	 *
+	 * Fixes fdo#86537
+	 */
+	if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020)
+		nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);
+	else
+		nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
+
+	return nvkm_pci_init(subdev);
+}
+
+const struct nvkm_subdev_func
+g84_pci_func = {
+	.dtor = nvkm_pci_dtor,
+	.preinit = nvkm_pci_preinit,
+	.init = g84_pci_init,
+	.fini = nvkm_pci_fini,
+};
diff --git a/drm/nouveau/nvkm/subdev/pci/gf100.c b/drm/nouveau/nvkm/subdev/pci/gf100.c
index 86f8226..a836d5f 100644
--- a/drm/nouveau/nvkm/subdev/pci/gf100.c
+++ b/drm/nouveau/nvkm/subdev/pci/gf100.c
@@ -42,3 +42,9 @@ gf100_pci_new(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
 {
 	return nvkm_pci_new_(&gf100_pci_func, device, index, ppci);
 }
+
+int
+gf100_pci_new_g84_init(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
+{
+	return nvkm_pci_new(&g84_pci_func, &gf100_pci_func, device, index, ppci);
+}
diff --git a/drm/nouveau/nvkm/subdev/pci/nv40.c b/drm/nouveau/nvkm/subdev/pci/nv40.c
index 090a187..5e2ef13 100644
--- a/drm/nouveau/nvkm/subdev/pci/nv40.c
+++ b/drm/nouveau/nvkm/subdev/pci/nv40.c
@@ -63,3 +63,9 @@ nv40_pci_new(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
 {
 	return nvkm_pci_new_(&nv40_pci_func, device, index, ppci);
 }
+
+int
+nv40_pci_new_g84_init(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
+{
+	return nvkm_pci_new(&g84_pci_func, &nv40_pci_func, device, index, ppci);
+}
diff --git a/drm/nouveau/nvkm/subdev/pci/nv50.c b/drm/nouveau/nvkm/subdev/pci/nv50.c
index 3e167d4..998453e 100644
--- a/drm/nouveau/nvkm/subdev/pci/nv50.c
+++ b/drm/nouveau/nvkm/subdev/pci/nv50.c
@@ -49,3 +49,9 @@ nv50_pci_new(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
 {
 	return nvkm_pci_new_(&nv50_pci_func, device, index, ppci);
 }
+
+int
+nv50_pci_new_g84_init(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
+{
+	return nvkm_pci_new(&g84_pci_func, &nv50_pci_func, device, index, ppci);
+}
diff --git a/drm/nouveau/nvkm/subdev/pci/priv.h b/drm/nouveau/nvkm/subdev/pci/priv.h
index d22c2c1..9615ae0 100644
--- a/drm/nouveau/nvkm/subdev/pci/priv.h
+++ b/drm/nouveau/nvkm/subdev/pci/priv.h
@@ -3,8 +3,17 @@
 #define nvkm_pci(p) container_of((p), struct nvkm_pci, subdev)
 #include <subdev/pci.h>
 
+
+
+int nvkm_pci_fini(struct nvkm_subdev *subdev, bool suspend);
+int nvkm_pci_preinit(struct nvkm_subdev *subdev);
+int nvkm_pci_init(struct nvkm_subdev *subdev);
+void * nvkm_pci_dtor(struct nvkm_subdev *subdev);
 int nvkm_pci_new_(const struct nvkm_pci_func *, struct nvkm_device *,
 		  int index, struct nvkm_pci **);
+int nvkm_pci_new(const struct nvkm_subdev_func *,
+		 const struct nvkm_pci_func *, struct nvkm_device *,
+		 int index, struct nvkm_pci **);
 
 struct nvkm_pci_func {
 	u32 (*rd32)(struct nvkm_pci *, u16 addr);
@@ -13,6 +22,8 @@ struct nvkm_pci_func {
 	void (*msi_rearm)(struct nvkm_pci *);
 };
 
+extern const struct nvkm_subdev_func g84_pci_func;
+
 u32 nv40_pci_rd32(struct nvkm_pci *, u16);
 void nv40_pci_wr08(struct nvkm_pci *, u16, u8);
 void nv40_pci_wr32(struct nvkm_pci *, u16, u32);
-- 
2.5.3

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[PATCH v5] pci: Handle 5-bit and 8-bit tag field

[Pierre Moreau]

If the hardware supports extended tag field (8-bit ones), then enable it. This
is usually done by the VBIOS, but not on some MBPs (see fdo#86537).
In case extended tag field is not supported, 5-bit tag field is used which
limits the possible number of requests to 32. Apparently bits 7:0 of 0x08841c
stores some number of outstanding requests, so cap it to 32 if extended tag is
unsupported.

Fixes: fdo#86537

v2: Restrict changes to chipsets >= 0x84
v3:
  * Add nvkm_pci_mask to pci.h
  * Mask bit 8 before setting it
v4:
  * Rename `add` argument of nvkm_pci_mask to `value`
  * Move code from nvkm_pci_init to g84_pci_init and remove PCIe and chipset
    checks
v5:
  * Rebase code on latest PCI structure
  * Restore PCIe check
  * Fix namings in nvkm_pci_mask
  * Rephrase part of the commit message

Signed-off-by: Pierre Moreau <pierre.morrow@free.fr>
---
 drm/nouveau/include/nvkm/subdev/pci.h |  1 +
 drm/nouveau/nvkm/subdev/pci/base.c    |  8 ++++++++
 drm/nouveau/nvkm/subdev/pci/g84.c     | 24 ++++++++++++++++++++++++
 drm/nouveau/nvkm/subdev/pci/g94.c     |  1 +
 drm/nouveau/nvkm/subdev/pci/gf100.c   |  1 +
 drm/nouveau/nvkm/subdev/pci/priv.h    |  2 ++
 6 files changed, 37 insertions(+)

diff --git a/drm/nouveau/include/nvkm/subdev/pci.h b/drm/nouveau/include/nvkm/subdev/pci.h
index 39ca88f..fee0a97 100644
--- a/drm/nouveau/include/nvkm/subdev/pci.h
+++ b/drm/nouveau/include/nvkm/subdev/pci.h
@@ -24,6 +24,7 @@ struct nvkm_pci {
 u32 nvkm_pci_rd32(struct nvkm_pci *, u16 addr);
 void nvkm_pci_wr08(struct nvkm_pci *, u16 addr, u8 data);
 void nvkm_pci_wr32(struct nvkm_pci *, u16 addr, u32 data);
+u32 nvkm_pci_mask(struct nvkm_pci *, u16 addr, u32 mask, u32 value);
 void nvkm_pci_rom_shadow(struct nvkm_pci *, bool shadow);
 
 int nv04_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
diff --git a/drm/nouveau/nvkm/subdev/pci/base.c b/drm/nouveau/nvkm/subdev/pci/base.c
index 2110622..d671dcf 100644
--- a/drm/nouveau/nvkm/subdev/pci/base.c
+++ b/drm/nouveau/nvkm/subdev/pci/base.c
@@ -46,6 +46,14 @@ nvkm_pci_wr32(struct nvkm_pci *pci, u16 addr, u32 data)
 	pci->func->wr32(pci, addr, data);
 }
 
+u32
+nvkm_pci_mask(struct nvkm_pci *pci, u16 addr, u32 mask, u32 value)
+{
+	u32 data = pci->func->rd32(pci, addr);
+	pci->func->wr32(pci, addr, (data & ~mask) | value);
+	return data;
+}
+
 void
 nvkm_pci_rom_shadow(struct nvkm_pci *pci, bool shadow)
 {
diff --git a/drm/nouveau/nvkm/subdev/pci/g84.c b/drm/nouveau/nvkm/subdev/pci/g84.c
index 8f3b001..3faa6bf 100644
--- a/drm/nouveau/nvkm/subdev/pci/g84.c
+++ b/drm/nouveau/nvkm/subdev/pci/g84.c
@@ -25,8 +25,32 @@
 
 #include <core/pci.h>
 
+void
+g84_pci_init(struct nvkm_pci *pci)
+{
+	/* The following only concerns PCIe cards. */
+	if (!pci_is_pcie(pci->pdev))
+		return;
+
+	/* Tag field is 8-bit long, regardless of EXT_TAG.
+	 * However, if EXT_TAG is disabled, only the lower 5 bits of the tag
+	 * field should be used, limiting the number of request to 32.
+	 *
+	 * Apparently, 0x041c stores some limit on the number of requests
+	 * possible, so if EXT_TAG is disabled, limit that requests number to
+	 * 32
+	 *
+	 * Fixes fdo#86537
+	 */
+	if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020)
+		nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);
+	else
+		nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
+}
+
 static const struct nvkm_pci_func
 g84_pci_func = {
+	.init = g84_pci_init,
 	.rd32 = nv40_pci_rd32,
 	.wr08 = nv40_pci_wr08,
 	.wr32 = nv40_pci_wr32,
diff --git a/drm/nouveau/nvkm/subdev/pci/g94.c b/drm/nouveau/nvkm/subdev/pci/g94.c
index 1714421..cd311ee 100644
--- a/drm/nouveau/nvkm/subdev/pci/g94.c
+++ b/drm/nouveau/nvkm/subdev/pci/g94.c
@@ -25,6 +25,7 @@
 
 static const struct nvkm_pci_func
 g94_pci_func = {
+	.init = g84_pci_init,
 	.rd32 = nv40_pci_rd32,
 	.wr08 = nv40_pci_wr08,
 	.wr32 = nv40_pci_wr32,
diff --git a/drm/nouveau/nvkm/subdev/pci/gf100.c b/drm/nouveau/nvkm/subdev/pci/gf100.c
index 86f8226..25e1ae7 100644
--- a/drm/nouveau/nvkm/subdev/pci/gf100.c
+++ b/drm/nouveau/nvkm/subdev/pci/gf100.c
@@ -31,6 +31,7 @@ gf100_pci_msi_rearm(struct nvkm_pci *pci)
 
 static const struct nvkm_pci_func
 gf100_pci_func = {
+	.init = g84_pci_init,
 	.rd32 = nv40_pci_rd32,
 	.wr08 = nv40_pci_wr08,
 	.wr32 = nv40_pci_wr32,
diff --git a/drm/nouveau/nvkm/subdev/pci/priv.h b/drm/nouveau/nvkm/subdev/pci/priv.h
index 1acd4bc..cf46d38 100644
--- a/drm/nouveau/nvkm/subdev/pci/priv.h
+++ b/drm/nouveau/nvkm/subdev/pci/priv.h
@@ -20,4 +20,6 @@ void nv40_pci_wr32(struct nvkm_pci *, u16, u32);
 void nv40_pci_msi_rearm(struct nvkm_pci *);
 
 void nv46_pci_msi_rearm(struct nvkm_pci *);
+
+void g84_pci_init(struct nvkm_pci *pci);
 #endif
-- 
2.6.0

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