On Fri, Apr 29, 2022 at 01:39:03PM -0700, Anusha Srivatsa wrote:
-----Original Message-----
From: De Marchi, Lucas <lucas.demarchi@xxxxxxxxx>
Sent: Tuesday, April 26, 2022 10:42 PM
To: Srivatsa, Anusha <anusha.srivatsa@xxxxxxxxx>
Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; stable@xxxxxxxxxxxxxxx
Subject: Re: [PATCH] drm/i915/dmc: Add MMIO range restrictions
On Tue, Apr 26, 2022 at 05:35:09PM -0700, Anusha Srivatsa wrote:
>Bspec has added some steps that check forDMC MMIO range before
>programming them
>
>v2: Fix for CI
>v3: move register defines to .h (Anusha)
>- Check MMIO restrictions per pipe
>- Add MMIO restricton for v1 dmc header as well (Lucas)
>
>BSpec: 49193
>
>Cc: <stable@xxxxxxxxxxxxxxx>
>Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
>Signed-off-by: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
>---
> drivers/gpu/drm/i915/display/intel_dmc.c | 48 ++++++++++++++++---
> drivers/gpu/drm/i915/display/intel_dmc_regs.h | 31 ++++++++++++
> 2 files changed, 72 insertions(+), 7 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c
>b/drivers/gpu/drm/i915/display/intel_dmc.c
>index 257cf662f9f4..ac7896835bfa 100644
>--- a/drivers/gpu/drm/i915/display/intel_dmc.c
>+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
>@@ -97,13 +97,6 @@ MODULE_FIRMWARE(SKL_DMC_PATH);
> #define BXT_DMC_MAX_FW_SIZE 0x3000
> MODULE_FIRMWARE(BXT_DMC_PATH);
>
>-#define DMC_DEFAULT_FW_OFFSET 0xFFFFFFFF
>-#define PACKAGE_MAX_FW_INFO_ENTRIES 20
>-#define PACKAGE_V2_MAX_FW_INFO_ENTRIES 32
>-#define DMC_V1_MAX_MMIO_COUNT 8
>-#define DMC_V3_MAX_MMIO_COUNT 20
>-#define DMC_V1_MMIO_START_RANGE 0x80000
>-
> struct intel_css_header {
> /* 0x09 for DMC */
> u32 module_type;
>@@ -374,6 +367,43 @@ static void dmc_set_fw_offset(struct intel_dmc
*dmc,
> }
> }
>
>+static bool dmc_mmio_addr_sanity_check(struct intel_dmc *dmc, const
u32 *mmioaddr,
>+ u32 mmio_count, int header_ver, u8
dmc_id) {
>+ struct drm_i915_private *i915 = container_of(dmc, typeof(*i915),
dmc);
>+ int i;
>+
>+ if (header_ver == 1) {
>+ for (i = 0; i < mmio_count; i++) {
>+ if (mmioaddr[i] < DMC_MMIO_START_RANGE ||
mmioaddr[i] > DMC_MMIO_END_RANGE)
>+ return false;
>+ }
return missing here
>+ }
>+
>+ /* Main DMC MMIO check */
>+ if (dmc_id == DMC_FW_MAIN) {
>+ for (i = 0; i < mmio_count; i++) {
>+ if (mmioaddr[i] < TGL_DMC_MMIO_START(dmc_id)
|| mmioaddr[i] > TGL_DMC_MMIO_END(dmc_id))
>+ return false;
>+ }
>+ }
>+
>+ /* Pipe DMC MMIO check */
>+ if (IS_DG2(i915) || IS_ALDERLAKE_P(i915)) {
>+ for (i = 0; i < mmio_count; i++) {
>+ if (mmioaddr[i] < ADLP_PIPE_MMIO_START &&
mmioaddr[i] > ADLP_PIPE_MMIO_END)
>+ return false;
>+ }
for DG2, main should use TGL_DMC_MMIO_START? and then fail here
because of another missing return above?
>+ } else if (IS_TIGERLAKE(i915) || IS_DG1(i915) ||
IS_ALDERLAKE_S(i915)) {
>+ for (i = 0; i < mmio_count; i++) {
>+ if (mmioaddr[i] < TGL_DMC_MMIO_START(dmc_id)
|| mmioaddr[i] > TGL_DMC_MMIO_END(dmc_id))
>+ return false;
this is handling DMC_FW_MAIN twice.
Maybe something like this:
u32 start, end;
if (header_ver == 1) {
start = DMC_MMIO_START_RANGE;
end = DMC_MMIO_END_RANGE;
} else if (dmc_id == DMC_FW_MAIN || IS_TIGERLAKE(i915) ||
IS_DG1(i915) || IS_ALDERLAKE_S(i915)) {
start = TGL_DMC_MMIO_START(dmc_id);
end = TGL_DMC_MMIO_END(dmc_id);
} else if (IS_DG2(i915) || IS_ALDERLAKE_P(i915)) {
start = ADLP_PIPE_MMIO_START;
end = ADLP_PIPE_MMIO_END;
} else {
drm_warn(&i915->drm, "Unknown mmio range for sanity
check");
return false;
}
for (i = 0; i < mmio_count; i++)
if (mmioaddr[i] < start || mmioaddr[i] > end)
return false;
return true;
... untested, and may need tweaks depending on the answer to the question
above on what range to use for ADL-P/DG2 on main DMC.
The above approach is definitely neater.
The main DMC offset is the same for all platforms.
>+ }
>+ }
>+
>+ return true;
>+}
>+
> static u32 parse_dmc_fw_header(struct intel_dmc *dmc,
> const struct intel_dmc_header_base
*dmc_header,
> size_t rem_size, u8 dmc_id)
>@@ -443,6 +473,10 @@ static u32 parse_dmc_fw_header(struct intel_dmc
*dmc,
> return 0;
> }
>
>+ if (!dmc_mmio_addr_sanity_check(dmc, mmioaddr, mmio_count,
dmc_header->header_ver, dmc_id))
>+ drm_err(&i915->drm, "DMC firmware has Wrong MMIO
Addresses\n");
>+ return 0;
you don't like DMC and decided to fail it for all platforms?
<facepalm>
>+
> for (i = 0; i < mmio_count; i++) {
> dmc_info->mmioaddr[i] = _MMIO(mmioaddr[i]);
> dmc_info->mmiodata[i] = mmiodata[i]; diff --git
>a/drivers/gpu/drm/i915/display/intel_dmc_regs.h
>b/drivers/gpu/drm/i915/display/intel_dmc_regs.h
>index d65e698832eb..235d1b721334 100644
>--- a/drivers/gpu/drm/i915/display/intel_dmc_regs.h
>+++ b/drivers/gpu/drm/i915/display/intel_dmc_regs.h
>@@ -11,12 +11,43 @@
> #define DMC_PROGRAM(addr, i) _MMIO((addr) + (i) * 4)
> #define DMC_SSP_BASE_ADDR_GEN9 0x00002FC0
> #define DMC_HTP_ADDR_SKL 0x00500034
>+#define DMC_DEFAULT_FW_OFFSET 0xFFFFFFFF
> #define DMC_SSP_BASE _MMIO(0x8F074)
> #define DMC_HTP_SKL _MMIO(0x8F004)
> #define DMC_LAST_WRITE _MMIO(0x8F034)
> #define DMC_LAST_WRITE_VALUE 0xc003b400
> #define DMC_MMIO_START_RANGE 0x80000
> #define DMC_MMIO_END_RANGE 0x8FFFF
>+#define PACKAGE_MAX_FW_INFO_ENTRIES 20
>+#define PACKAGE_V2_MAX_FW_INFO_ENTRIES 32
>+#define DMC_V1_MAX_MMIO_COUNT 8
>+#define DMC_V3_MAX_MMIO_COUNT 20
why are you moving these to _regs? these describe the DMC header/blob
Yeah my mistake. While making the change they seemed like the right thing to do.
>+#define DMC_V1_MMIO_START_RANGE 0x80000
>+#define _TGL_MAIN_MMIO_START 0x8F000
>+#define _TGL_MAIN_MMIO_END 0x8FFFF
>+#define _TGL_PIPEA_MMIO_START 0x92000
>+#define _TGL_PIPEA_MMIO_END 0x93FFF
>+#define _TGL_PIPEB_MMIO_START 0x96000
>+#define _TGL_PIPEB_MMIO_END 0x97FFF
>+#define _TGL_PIPEC_MMIO_START 0x9A000
>+#define _TGL_PIPEC_MMIO_END 0x9BFFF
>+#define _TGL_PIPED_MMIO_START 0x9E000
>+#define _TGL_PIPED_MMIO_END 0x9FFFF
>+#define ADLP_PIPE_MMIO_START 0x5F000
>+#define ADLP_PIPE_MMIO_END 0x5FFFF
>+
>+#define TGL_DMC_MMIO_START(pipe) _PICK(pipe,
_TGL_MAIN_MMIO_START,\
_PICK? Did you miss my previous review?
No. the thing is Main DMC with the Pipe DMCs are not evenly spaced. So using PICK_EVEN is not the right choice here. We also don't need to do _MMIO really.....
Unless I am missing something, this seems like the right approach.
Because the name you chose for your variable:
TGL_DMC_MMIO_START(pipe) _PICK(pipe,
I was expecting this to be used only with the pipe DMC address, which
are evenly spaced. It seems the argument you're expecting here is a
dmc_id. But.... you said:
The main DMC offset is the same for all platforms.
So, maybe just handle that separately and keep using pipe here? Then you
can switch to _PICK_EVEN()
Lucas De Marchi
